Particle accelerator and particle beam therapy device

Abstract

A particle accelerator that rotates and accelerates a charged particle beam as a rotating beam while ejecting a part of the rotating beam as an ejected beam, the particle accelerator comprising: a first deflection section and a second deflection section, each having a deflection electromagnet; a first straight section, a second straight section, and a third straight section, each not having a deflection electromagnet; and a control section, a front section of the first straight section having an ejection deflector that deflects a part of the rotating beam toward an inner side of a rotating track of the rotating beam to separate the part as the ejected beam, a rear section of the third straight section having an ejection deflector that deflects the ejected beam separated from the rotating beam by the ejection deflector of the front section toward the other side of the outer side of the rotating track of the rotating beam, and the control section controlling at least a quadrupole electromagnet to make a phase progress of electron induction accelerator vibration of the ejected beam 270 ± 45 degrees in an interval from the ejection deflector of the front section to the ejection deflector of the rear section.

Description

Technical Field

[0001] This invention relates to particle accelerators and particle beam therapy devices.

[0002] This application claims priority based on Japanese Patent Application No. 2020-108088, filed on June 23, 2020, the contents of which are incorporated herein by reference. Background Technology

[0003] Particle accelerators, as devices for generating high-energy charged particles, are widely used in various fields such as science, industry, and medicine. In the field of particle beam therapy, circular accelerators are currently used because they can accelerate charged particles to high energies within a limited space. Furthermore, there is an increasing trend towards miniaturizing particle beam therapy devices using superconducting technology to reduce the cost of implementing such facilities. By using superconducting magnets with high magnetic fields, high-energy charged particles can be deflected with a shorter radius of curvature, thus enabling the miniaturization of circular accelerators. Since circular accelerators occupy a large area in particle beam therapy devices, using superconducting magnets in circular accelerators is a highly effective way to miniaturize these devices.

[0004] A synchrotron, as a type of circular accelerator, deflects a charged particle beam using a magnetic field generated by electromagnets, while simultaneously imparting acceleration energy within a high-frequency acceleration cavity. The magnetic field generated by the electromagnets is increased in response to the energy changes of the charged particle beam, thus accelerating the beam into various energies while maintaining a stable rotating trajectory. The beam is then extracted (ejected) outside the synchrotron using a deflector. Because the charged particle beam rotating within the synchrotron, even when accelerated and undergoing energy changes, still follows the same trajectory, individual components such as electromagnets are relatively small and highly efficient in generating high-energy charged particles, making them suitable for this purpose.

[0005] To date, in order to achieve miniaturization of synchrotrons, a generally square synchrotron consisting of a short straight section and a curved section with a large curvature has been proposed. In such a synchrotron, since each straight section is short, an ejection deflector for separating the emitted beam from the rotating beam is provided in the straight section upstream of the curved section, and an ejection deflector for extracting the emitted beam separated from the rotating beam to the outside is provided in the straight section downstream of the curved section. On the other hand, deflection electromagnets such as superconducting magnets, which require cooling units, are provided in the curved sections with a large curvature.

[0006] Figure 9 This is a diagram illustrating an existing particle accelerator and a particle beam therapy device that utilizes such an existing particle accelerator. Figure 10 It means Figure 9The passage area of ​​the rotating beam 131 in the existing example shown ( Figure 10 A diagram showing the relationship between the shaded area and the trajectory of the emitted beam 132. Figure 10 In the diagram, the S-axis indicates the direction of travel of the rotating beam 131. The X-axis, contained in a plane orthogonal to the S-axis, corresponds to the deflection direction of the deflecting electromagnet 102. The Y-axis, contained in a plane orthogonal to the S-axis, is orthogonal to the X-axis.

[0007] In miniaturizing the synchrotron (particle accelerator) 100, extracting (emitting) the accelerated high-energy beam without loss has become a significant challenge. For effective miniaturization, it is necessary not only to shorten the deflection section 121 by increasing the magnetic field strength of the deflecting electromagnet 102, but also to shorten the straight sections 111 and 112. However, to extract the emitted beam 132 without loss from the synchrotron (particle accelerator) 100, it is necessary to use the front-end deflector 108 to separate the emitted beam 132 from the rotating beam 131, and the rear-end deflector 109 to significantly bend the emitted beam 132 outside the synchrotron (particle accelerator) 100. However, performing these actions requires relatively long spaces for arranging the front-end deflector 108 and the rear-end deflector 109, which contradicts the need to shorten the straight sections 111 and 112.

[0008] Therefore, in the case of miniaturization Figure 9 The existing synchrotron (particle accelerator) 100 shown employs a structure in which the front-end ejection deflector 108 and the rear-end ejection deflector 109 are divided into two linear sections (a first linear section 111 and a second linear section 112). Specifically, the front-end ejection deflector 108 is disposed in the first linear section 111, and a first deflection section 121 is connected downstream of the first linear section 111. The first deflection section 121 is composed of one deflection electromagnet 102, or a combination of two or more deflection electromagnets 102 and a short linear section. Furthermore, the rear-end ejection deflector 109 is disposed in the second linear section 112 downstream of the first deflection section 121.

[0009] However, in this method, such as Figure 10 As shown, to avoid beam loss, the condition is that the rotating beam 131 and the emitted beam 132 are significantly separated at the position of the ejection deflector 109 in the rear section. Therefore, it is required that the emitted beam 132 be significantly deflected by the ejection deflector 108 in the front section. Under such circumstances, the trajectory of the emitted beam 132 at the first deflection section 121 is diverted from the area through which the rotating beam 131 passes. Figure 10The shaded area deviates significantly. The deflecting electromagnet 102 of the first deflection section 121 must also deliver an output beam 132 far from the central track, inevitably significantly expanding the magnetic field generation area of ​​the deflecting electromagnet 102 of the first deflection section 121. As a result, it is unavoidable that the deflecting electromagnet 102 of the first deflection section 121 becomes larger and more expensive. Especially when using a superconducting magnet as the deflecting electromagnet 102 of the first deflection section 121, the widening of the magnetic field generation area increases operating costs at each stage, including manufacturing difficulty, cost, and cooling, thus becoming a significant challenge.

[0010] In detail, in this method, the emitted beam 132, which deviates significantly from the rotating beam 131, must be deflected along the curved shape of the first deflection section 121 by the deflection electromagnet 102 of the first deflection section 121. Therefore, it is necessary to greatly expand the magnetic field generation area of ​​the deflection electromagnet 102, such as the superconducting magnet provided in the first deflection section 121, which not only incurs costs but also leads to large size.

[0011] In particular, Figure 9 In the small synchrotron (particle accelerator) 100 shown, to reduce the number of devices and improve space efficiency, it is important to reduce the number of groups of straight sections such as the first straight section 111 and the second straight section 112 and deflection sections such as the first deflection section 121. Preferably, there are no more than six groups of straight sections and deflection sections, ideally no more than four. In this case, the deflection angle of the charged particle beam in each deflection section also increases, and the focusing effect of the deflection electromagnet 102 on the charged particle beam is enhanced. Therefore, it is required that the front-end ejection deflector 108 directs the ejected beam 132 from the central track of the rotating beam 131 (…). Figure 10 The shaded area deviates more significantly, resulting in a further expansion of the magnetic field generation region of the deflecting electromagnet 102.

[0012] Furthermore, as another problem arises from the emitted beam 132 passing through a trajectory significantly deviating from the central trajectory of the rotating beam 131, the particle distribution shape of the emitted beam 132 is sometimes distorted due to the strong influence of the nonlinear magnetic field component generated by the deflecting electromagnet 102. Since maintaining the uniformity of the generated magnetic field over a large area is very difficult, the error from the ideal magnetic field distribution generally increases the further away from the center of the electromagnet, introducing a nonlinear magnetic field component. When the charged particle beam passes through a position not too far from the center of the electromagnet, the nonlinear magnetic field component has a smaller impact on the beam distribution; however, when the charged particle beam passes through a trajectory significantly away from the center of the electromagnet, the nonlinear magnetic field component has a larger impact on the charged particle beam, and the distribution shape of the irradiation beam 302 is distorted (see reference). Figure 11 (B)

[0013] Figure 11This is a diagram used to illustrate the ideal two-dimensional cross-sectional distribution of the irradiation beam 302. In detail, Figure 11 (A) represents an example where the shape of the two-dimensional cross-sectional distribution 302a of the irradiation beam 302 is not deformed as the charged particle beam passes through the center of the electromagnet. Figure 11 (B) represents an example where the shape of the two-dimensional cross-sectional distribution 302a' of the irradiation beam 302 is deformed as the charged particle beam passes through an orbit that is significantly away from the center of the electromagnet. Figure 11 (A) and Figure 11 The X-axis of (B) and Figure 10 Corresponding to the X-axis, Figure 11 (A) and Figure 11 The Y-axis of (B) and Figure 10 Corresponding to the Y-axis.

[0014] exist Figure 11 In the example shown in (A) where the shape of the two-dimensional profile distribution 302a of the irradiation beam 302 is not deformed, the shape of the two-dimensional profile distribution 302a of the irradiation beam 302 is circular, and the shape of the horizontal projection profile 302b of the irradiation beam 302 is approximately the same as the shape of the vertical projection profile 302c.

[0015] exist Figure 11 In the example shown in (B) where the shape of the two-dimensional profile distribution 302a' of the irradiation beam 302 is deformed, the shape of the two-dimensional profile distribution 302a' of the irradiation beam 302 is non-circular, and the shape of the horizontal projection profile 302b' of the irradiation beam 302 is different from the shape of the vertical projection profile 302c'.

[0016] like Figure 11 As shown in example (B), when an irradiation beam 302 with a two-dimensional profile distribution 302a' that is affected by a strong nonlinear magnetic field component is used for particle beam therapy, the dose error increases, which may become a cause of increased damage to normal tissues.

[0017] In order to solve the above-mentioned problems, the inventors have proposed the method described in Patent Document 1.

[0018] In the technology described in Patent Document 1, a second ejection deflection plate, indicated by reference numeral 6, is provided directly in front of the deflecting electromagnet shown in Patent Document 1. The second ejection deflection plate, indicated by reference numeral 8c, kicks the ejection beam, indicated by reference numeral 11, which has separated from the rotating beam shown by reference numeral 10, into the central track of the rotating beam via the first ejection deflection plate (the front ejection deflector) shown by reference numeral 8a. This causes the ejection beam to obliquely traverse the central track of the rotating beam within the deflecting electromagnet shown by reference numeral 6. Then, it is bent again towards the central track of the rotating beam by the converging electromagnet shown by reference numeral 7. Finally, the ejection beam is extracted to the outside of the synchrotron by the final ejection deflection plate (the rear ejection deflector) shown by reference numeral 8b. Thus, in the technology described in Patent Document 1, the magnetic field generation region of the deflecting electromagnet, such as the superconducting magnet requiring a cooling unit, can be miniaturized within the deflecting electromagnet shown by reference numeral 6.

[0019] However, in the technology described in Patent Document 1, a second ejection deflection plate is required to be provided on the straight section upstream of the deflection electromagnet shown in Figure 6 for kicking the ejected beam toward the central track of the rotating beam. Therefore, the straight section upstream of the deflection electromagnet shown in Figure 6 and the straight section opposite it become longer, and the synchrotron is enlarged as a whole.

[0020] In addition, Patent Documents 2 and 3 describe a synchrotron and a particle beam therapy system using a synchrotron.

[0021] Specifically, paragraph 0007 of Patent Document 3 describes designing the phase difference between the first and second ejection deflectors to be approximately 90 degrees. Furthermore, paragraph 0010 of Patent Document 3 describes setting the phase lead up to the first and second ejection deflectors to be approximately 90 degrees + 180 degrees × n. Moreover, paragraph 0025 of Patent Document 3 describes setting the phase difference between the first and third ejection deflectors to be approximately 180 degrees.

[0022] On the other hand, according to the technology described in Patent Documents 1 to 3, it is impossible to miniaturize the synchrotron while suppressing costs and other factors, so as to make the particle distribution shape of the emitted beam appropriate.

[0023] Existing technical documents

[0024] Patent documents

[0025] Patent Document 1: Japanese Patent Application Publication No. 2016-081729

[0026] Patent Document 2: Japanese Patent Application Publication No. 2012-234805

[0027] Patent Document 3: Japanese Patent Application Publication No. 2012-022776 Summary of the Invention

[0028] The problem that the invention aims to solve

[0029] In view of the above points, the object of the present invention is to provide a particle accelerator and a particle beam therapy device that can be miniaturized.

[0030] In detail, the purpose of this invention is to provide a particle accelerator and a particle beam therapy device that can achieve miniaturization of the particle accelerator while reducing the magnetic field generation area required by the deflection electromagnet of the deflection section and reducing the overall cost involved in the deflection electromagnet.

[0031] Methods for solving problems

[0032] One aspect of the present invention relates to a particle accelerator that accelerates a charged particle beam while rotating it as a rotating beam, and emits a portion of the rotating beam as an exit beam. The particle accelerator comprises: a plurality of deflection sections having deflection electromagnets; a plurality of straight sections without the deflection electromagnets; and a control unit, wherein the plurality of straight sections include: a first straight section having an exit deflector at its front end; a second straight section disposed downstream of the first straight section in the direction of travel of the rotating beam, having a quadrupole electromagnet; and a third straight section disposed downstream of the second straight section in the direction of travel of the rotating beam, having an exit deflector at its rear end. The plurality of deflection sections include: the first deflection section, connected to... The system comprises a first straight section and a second straight section; and a second deflection section, connecting the second straight section and the third straight section. The front-end ejection deflector causes a portion of the rotating beam to deflect towards one of the inner and outer sides of the rotating track of the rotating beam, thus separating it into the ejection beam. The rear-end ejection deflector causes the ejection beam separated from the rotating beam by the front-end ejection deflector to deflect towards the other of the inner and outer sides of the rotating track of the rotating beam. The control unit controls at least the quadrupole electromagnet so that the phase progression of the electron induction accelerator vibration of the ejection beam is 270 ± 45 degrees in the interval from the front-end ejection deflector to the rear-end ejection deflector.

[0033] In one aspect of the particle accelerator according to the present invention, the control unit may control at least the quadrupole electromagnet so that the phase progression of the electron induction accelerator vibration of the emitted beam is 270±45 degrees in the interval from the front-end emission deflector to the rear-end emission deflector. The control unit controls the front-end emission deflector so that the emitted beam passes near the passage area of ​​the rotating beam in the first deflector and passes through the passage area of ​​the rotating beam in the second deflector, or passes near the passage area of ​​the rotating beam in the second deflector and passes through a position in the third straight section away from the passage area of ​​the rotating beam.

[0034] In one embodiment of the particle accelerator, the first linear portion and the third linear portion may be positioned opposite each other on the rotational trajectory of the rotating beam.

[0035] In one embodiment of the particle accelerator, the first straight section and the third straight section may extend parallel to each other.

[0036] In one embodiment of the particle accelerator of the present invention, each of the plurality of deflection sections may have a deflection electromagnet and a quadrupole electromagnet for the deflection section, or a quadrupole magnetic field generating mechanism for the deflection section that integrates the deflection electromagnet and the quadrupole magnetic field coil. Each of the plurality of linear sections may have the quadrupole electromagnet. The control unit adjusts the excitation amount of the quadrupole electromagnet for the deflection section of each of the plurality of deflection sections, or the excitation amount of the quadrupole magnetic field generating mechanism for the deflection section, and the excitation amount of the quadrupole electromagnet for each of the plurality of linear sections, so that the phase progression of the electron induction accelerator vibration of the emitted beam is 270 ± 45 degrees in the interval from the front-end emission deflector to the rear-end emission deflector. This increases the number of adjustment elements (parameters) controlled by the control unit, thus enabling more precise control.

[0037] In one embodiment of the particle accelerator of the present invention, the control unit may adjust the excitation amount of the quadrupole electromagnets of the deflection sections or the excitation amount of the quadrupole magnetic field generating mechanism of the deflection sections, and the excitation amount of the quadrupole electromagnets of the linear sections, so that the phase progression of the electron induction accelerator vibration of the emitted beam is 270±45 degrees in the interval from the front-end emission deflector to the rear-end emission deflector. The control unit adjusts the electric field strength of the front-end emission deflector so that the emitted beam passes near the passage area of ​​the rotating beam in the first deflection section and passes through the passage area of ​​the rotating beam in the second deflection section, or passes near the passage area of ​​the rotating beam in the second deflection section and passes through a position in the third linear section away from the passage area of ​​the rotating beam.

[0038] In one embodiment of the particle accelerator, each of the plurality of linear sections may have a quadrupole electromagnet, and the control unit may adjust the quadrupole electromagnet of each of the plurality of linear sections so that the phase progression of the electron induction accelerator vibration of the emitted beam is 270±45 degrees in the interval from the front deflector to the rear deflector.

[0039] In one aspect of the particle accelerator according to the present invention, the control unit may adjust the quadrupole electromagnets of each of the plurality of linear sections so that the phase progression of the electron induction accelerator vibration of the emitted beam is 270±45 degrees in the interval from the front emission deflector to the rear emission deflector. The control unit adjusts the electric field strength of the front emission deflector so that the emitted beam passes near the passage area of ​​the rotating beam in the first deflector section and passes through the passage area of ​​the rotating beam in the second deflector section, or passes near the passage area of ​​the rotating beam in the second deflector section and passes through a position in the third linear section away from the passage area of ​​the rotating beam.

[0040] In one embodiment of the particle accelerator of the present invention, the deflection angle of the charged particle beam based on the first deflection section may be 60 degrees or more.

[0041] In one embodiment of the particle accelerator, the total deflection angle of the charged particle beam based on the first deflection section and the second deflection section may be 180 degrees.

[0042] In one embodiment of the particle accelerator of the present invention, the first linear section and the third linear section may each have the quadrupole electromagnet, the front section's ejection deflector is disposed downstream of the quadrupole electromagnet of the first linear section in the direction of travel of the rotating beam, and the rear section's ejection deflector is disposed downstream of the quadrupole electromagnet of the third linear section in the direction of travel of the rotating beam.

[0043] In one embodiment of the particle accelerator of the present invention, the quadrupole electromagnet of the first straight section may be disposed approximately at the center of the first straight section in the direction of travel of the rotating beam, and the quadrupole electromagnet of the third straight section may be disposed approximately at the center of the third straight section in the direction of travel of the rotating beam.

[0044] One aspect of the present invention relates to a particle beam therapy apparatus comprising: the particle accelerator; and an irradiation device for delivering the charged particle beam extracted from the particle accelerator as the emitted beam and irradiating the irradiated object.

[0045] Invention Effects

[0046] According to the present invention, a particle accelerator and a particle beam therapy device capable of miniaturization can be provided.

[0047] In detail, according to the present invention, a particle accelerator and a particle beam therapy device can be provided, which can achieve miniaturization of the particle accelerator while reducing the magnetic field generation area required by the deflection electromagnet of the deflection section and reducing the overall cost involved in the deflection electromagnet. Attached Figure Description

[0048] Figure 1 This is a diagram illustrating an example of a synchrotron (particle accelerator) according to the first embodiment and a particle beam therapy device using the synchrotron.

[0049] Figure 2 This is a block diagram, etc., showing a part of the structure of the synchrotron according to the first embodiment.

[0050] Figure 3 This is a diagram showing the relationship between the passage area of ​​the rotating beam and the trajectory of the emitted beam in the synchrotron of the first embodiment.

[0051] Figure 4 This is a diagram illustrating an example of the phase progression of the electron-induction accelerator vibration of the emitted beam set in the synchrotron of the first embodiment.

[0052] Figure 5 This is a diagram illustrating an example of a synchrotron (particle accelerator) according to the second embodiment.

[0053] Figure 6 This is a diagram illustrating an example of a synchrotron (particle accelerator) according to the third embodiment.

[0054] Figure 7 This is a diagram illustrating an example of a synchrotron (particle accelerator) according to the fourth embodiment.

[0055] Figure 8 This is a diagram illustrating an example of a synchrotron (particle accelerator) according to the fifth embodiment.

[0056] Figure 9 This diagram shows a conventional particle accelerator and a particle beam therapy device that uses the particle accelerator.

[0057] Figure 10 It means Figure 9 The diagram shows the relationship between the passage area of ​​the rotating beam and the trajectory of the emitted beam in the existing example.

[0058] Figure 11 It is a diagram used to illustrate the ideal two-dimensional cross-sectional distribution of the irradiation beam, etc.

[0059] Figure 12 This is a diagram illustrating an example of a synchrotron (particle accelerator) according to the sixth embodiment.

[0060] Figure 13 This is a diagram illustrating an example of a synchrotron (particle accelerator) according to the seventh embodiment.

[0061] Figure 14 This is a diagram showing the relationship between the passage area of ​​the rotating beam and the trajectory of the emitted beam in the synchrotron of the second embodiment.

[0062] Figure 15 It is Figure 1 and Figure 3 A graph with connections has been created. Detailed Implementation

[0063] Hereinafter, embodiments of the particle accelerator and particle beam therapy apparatus of the present invention will be described with reference to the accompanying drawings.

[0064] <First Implementation>

[0065] Figure 1 This is a diagram illustrating an example of a synchrotron (particle accelerator) 100 according to the first embodiment and a particle beam therapy device using the synchrotron 100. Figure 2 This is a block diagram, etc., showing a portion of the structure of the synchrotron 100 according to the first embodiment. More specifically, Figure 2The left side is shown in block diagram as a part of the structure of the synchrotron 100 of the first embodiment. Figure 2 The top right portion represents the relationship between the current I flowing in the deflecting electromagnet 102 and time t. Figure 2 The second part from the top on the right shows the relationship between the current I flowing in the converging quadrupole electromagnet 104 and time t. Figure 2 The second part from the bottom on the right shows the relationship between the current I flowing in the divergent quadrupole electromagnet 103 and time t. Figure 2 The bottom right portion represents the relationship between the voltage V between the electrodes of the front-end deflector 108 and time t.

[0066] exist Figure 1 In the example shown, the particle beam therapy device using the synchrotron 100 of the first embodiment includes the synchrotron 100, the incident device 201, and the irradiation device 301.

[0067] The incident device 201 supplies charged particles, which are generated and accelerated to a predetermined energy, to the synchrotron 100. The incident device 201 includes, for example, an ion source (not shown) and a linear accelerator (not shown). The ion source generates ions by colliding high-speed electrons with neutral gases, and these ions are accelerated in the linear accelerator to a state that can be accelerated by the synchrotron 100. Examples of atoms and particles that are ionized include hydrogen, helium, carbon, nitrogen, oxygen, neon, silicon, and argon. The linear accelerator accelerates the charged particles supplied from the ion source to a predetermined energy and supplies them to the synchrotron 100. Examples of linear accelerators include RFQ (Radio Frequency Quadrupole) linear accelerators and drift tube linear accelerators that accelerate and focus charged particles using a high-frequency quadrupole electric field. Through the linear accelerator, the charged particles are accelerated to energies of approximately MeV per nucleon.

[0068] Irradiation device 301 delivers as an emitted beam 132 (see reference) Figure 3 The charged particle beam extracted from the synchrotron 100 is used to irradiate the target as an irradiation beam 302.

[0069] exist Figure 1 In the example shown, the irradiation field forming device is included in the irradiation device 301, but in other examples, the irradiation field forming device and the irradiation device 301 may be separately included in the particle beam therapy device.

[0070] exist Figure 1 as well as Figure 2In the example shown, the synchrotron 100 accelerates a beam of charged particles supplied from the linear accelerator of the incident 201 as a rotating beam 131, and emits a portion of the rotating beam 131 as an exit beam 132. The synchrotron 100 includes, for example, an incident deflector 101, eight deflecting electromagnets 102, four diverging quadrupole electromagnets 103, four converging quadrupole electromagnets 104, two resonant excitation multipole electromagnets 105, a high-frequency acceleration cavity 106, a high-frequency impact device 107, a front exit deflector 108, a rear exit deflector 109, a control unit 140, and multiple power supplies 150.

[0071] The incident deflector 101 deflects the charged particle beam incident by the incident device 201 into a rotating beam 131. The incident deflector 101 is connected to a first deflecting electromagnet 102 disposed on the downstream side of the traveling direction of the rotating beam 131.

[0072] The deflecting electromagnet 102 deflects the rotating beam 131. The first deflecting electromagnet 102 is connected to the first diverging quadrupole electromagnet 103 located on the downstream side of the traveling direction of the rotating beam 131.

[0073] exist Figure 1 as well as Figure 2 In the example shown, the deflecting electromagnet 102 is not a functionally coupled electromagnet with an added quadrupole magnetic field component, but in other examples, the deflecting electromagnet 102 may be a functionally coupled electromagnet with an added quadrupole magnetic field component, etc.

[0074] In addition, Figure 1 as well as Figure 2 In the example shown, there are no corners at the end of the deflecting electromagnet 102, but in other examples, there may be corners at the end of the deflecting electromagnet 102.

[0075] exist Figure 1 as well as Figure 2 In the example shown, a quadrupole electromagnet 103 is used to direct the rotating beam 131 in the horizontal direction. Figure 3 It diverges out along the X-axis and towards the vertical direction. Figure 3 The beam converges along the Y-axis. The first diverging quadrupole electromagnet 103 is connected to the second deflecting electromagnet 102, which is positioned downstream of the traveling direction of the rotating beam 131. The second deflecting electromagnet 102 is connected to the first converging quadrupole electromagnet 104, which is positioned downstream of the traveling direction of the rotating beam 131.

[0076] A converging quadrupole electromagnet 104 converges the rotating beam 131 in the horizontal direction and diverges it in the vertical direction. The first converging quadrupole electromagnet 104 is connected to the front section of the ejection deflector 108, which is located on the downstream side of the traveling direction of the rotating beam 131.

[0077] The front-end ejection deflector 108 includes a diaphragm electrode 108a (see reference). Figure 3 The diaphragm electrode 108a orients a portion of the rotating beam 131 toward the rotating track of the rotating beam 131. Figure 3 The inner side of the shaded area (closer to the slewing track of the slewing beam 131) Figure 3 The negative side of the X-axis deflects and separates into the emitted beam 132.

[0078] exist Figure 1 as well as Figure 2 In the example shown, the emitted beam 132 is bent by the front-end emitted deflector 108, which is an electrostatic device consisting of a thin diaphragm electrode 108a, in a manner that separates it from the rotating beam 131, in order to minimize beam loss.

[0079] like Figure 1 As shown, the first straight section 111 includes a first converging quadrupole electromagnet 104 and a front-end ejection deflector 108. The first converging quadrupole electromagnet 104 is positioned approximately at the center of the first straight section 111 in the direction of travel of the rotating beam 131. The first straight section 111 does not have a deflection electromagnet 102.

[0080] exist Figure 1 In the example shown, since the first converging quadrupole electromagnet 104 is positioned approximately at the center of the first straight section 111 in the direction of travel of the rotating beam 131, the beam passage area in the first deflection section 121 where the rotating beam 131 and the emitted beam 132 are combined can be reduced, and the magnetic field generation area required by the deflection electromagnet 102 of the first deflection section 121 can be minimized.

[0081] In other examples, the first converging quadrupole electromagnet 104 may not be positioned approximately at the center of the first straight section 111 in the direction of travel of the rotating beam 131. In yet another example, the first converging quadrupole electromagnet 104 may not be provided in the first straight section 111.

[0082] Figure 3 This is a diagram showing the relationship between the passage region of the rotating beam 131 and the trajectory of the emitted beam 132 in the synchrotron (particle accelerator) 100 of the first embodiment. Figure 3In the diagram, the S-axis direction indicates the travel direction of the rotating beam 131. The X-axis contained in the plane orthogonal to the S-axis corresponds to the deflection direction of the deflection electromagnet 102, the deflection direction of the front ejection deflector 108, and the deflection direction of the rear ejection deflector 109. Figure 15 It is Figure 1 and Figure 3 A graph with connections has been created.

[0083] The deflection directions of the deflecting electromagnet 102, the front-end injection deflector 108, and the rear-end injection deflector 109 are all along the same axis in the XYS coordinate system, but with different signs. The X-axis is parallel to the deflection directions of the deflecting electromagnet 102, the front-end injection deflector 108, and the rear-end injection deflector 109, respectively. The Y-axis, contained within a plane orthogonal to the S-axis, is orthogonal to the X-axis.

[0084] Here, in Figure 3 In this diagram, the intersection of each X-axis, Y-axis, and S-axis is represented as O. Although no special restrictions are required, the outer side of the rotation track of the cyclotron beam 131 in the synchrotron beam 100 is marked as positive (+) on the X-axis, and the inner side of the rotation track of the cyclotron beam 131 is marked as negative (-) on the X-axis.

[0085] like Figure 3 As shown, the rotating beam 131 is converged by the first converging quadrupole electromagnet 104, and then a portion of the rotating beam 131 is directed toward the rotating track of the rotating beam 131 by the diaphragm electrode 108a of the front-end ejection deflector 108. Figure 3 The inner side of the shaded area (closer to the slewing track of the slewing beam 131) Figure 3 (The lower side) deflects and separates into the emitted beam 132.

[0086] exist Figures 1-3 In the example shown, the front-end ejection deflector 108 is connected to a third deflecting electromagnet 102 located downstream of the traveling direction of the rotating beam 131. The third deflecting electromagnet 102 is connected to a second diverging quadrupole electromagnet 103 located downstream of the traveling direction of the rotating beam 131. The second diverging quadrupole electromagnet 103 is connected to a fourth deflecting electromagnet 102 located downstream of the traveling direction of the rotating beam 131.

[0087] like Figure 1 as well as Figure 3 As shown, the first deflection section 121 includes a third deflection electromagnet 102, a second diverging quadrupole electromagnet 103, and a fourth deflection electromagnet 102.

[0088] exist Figures 1-3In the example shown, the first deflection section 121 has two deflection electromagnets 102, but in other examples, the first deflection section 121 may have three or more deflection electromagnets 102.

[0089] exist Figures 1-3 In the example shown, the first deflection section 121 has a divergent quadrupole electromagnet 103 that forms a shorter straight section, but in other examples, the first deflection section 121 may have two or more quadrupole electromagnets (which may not be divergent).

[0090] In another example, the first deflection section 121 may also include a deflection section quadrupole magnetic field generating mechanism that integrates the deflection electromagnet 102 and the quadrupole magnetic field coil.

[0091] exist Figures 1-3 In the example shown, the fourth deflecting electromagnet 102 is connected to the second converging quadrupole electromagnet 104, which is positioned downstream of the traveling direction of the rotating beam 131. The second converging quadrupole electromagnet 104 is connected to the first resonant excitation multipole electromagnet 105, which is positioned downstream of the traveling direction of the rotating beam 131. The first resonant excitation multipole electromagnet 105 is connected to the high-frequency accelerating cavity 106, which is positioned downstream of the traveling direction of the rotating beam 131.

[0092] like Figure 1 as well as Figure 3 As shown, the second linear section 112 includes a second converging quadrupole electromagnet 104, a first resonant excitation multipole electromagnet 105, and a high-frequency accelerating cavity 106. The second linear section 112 does not have a deflection electromagnet 102.

[0093] exist Figures 1-3 In the example shown, since the second converging quadrupole electromagnet 104 is positioned approximately at the center of the second straight section 112 in the direction of travel of the rotating beam 131, the beam passage area in the second deflection section 122 where the rotating beam 131 and the emitted beam 132 are combined can be reduced, and the magnetic field generation area required by the deflection electromagnet 102 of the second deflection section 122 can be minimized.

[0094] In other examples, the second converging quadrupole electromagnet 104 may not be positioned approximately at the center of the second straight section 112 in the direction of travel of the rotating beam 131. In yet another example, the second converging quadrupole electromagnet 104 may not be provided in the second straight section 112.

[0095] exist Figures 1-3In the example shown, the high-frequency acceleration cavity 106 is connected to the fifth deflecting electromagnet 102 located downstream of the traveling direction of the rotating beam 131. The fifth deflecting electromagnet 102 is connected to the third diverging quadrupole electromagnet 103 located downstream of the traveling direction of the rotating beam 131. The third diverging quadrupole electromagnet 103 is connected to the sixth deflecting electromagnet 102 located downstream of the traveling direction of the rotating beam 131.

[0096] like Figure 1 as well as Figure 3 As shown, the second deflection section 122 includes a fifth deflection electromagnet 102, a third diverging quadrupole electromagnet 103, and a sixth deflection electromagnet 102.

[0097] exist Figures 1-3 In the example shown, the second deflection section 122 has two deflection electromagnets 102, but in other examples, the second deflection section 122 may have three or more deflection electromagnets 102.

[0098] exist Figures 1-3 In the example shown, the second deflection section 122 has a divergent quadrupole electromagnet 103 that forms a shorter straight section, but in other examples, the second deflection section 122 may have two or more quadrupole electromagnets (which may not be divergent).

[0099] In another example, the second deflection section 122 may also include a deflection section quadrupole magnetic field generating mechanism that integrates the deflection electromagnet 102 and the quadrupole magnetic field coil.

[0100] exist Figures 1-3 In the example shown, the sixth deflecting electromagnet 102 is connected to the third converging quadrupole electromagnet 104, which is located downstream of the traveling direction of the gyratory beam 131. The third converging quadrupole electromagnet 104 is connected to the ejector deflector 109, which is located downstream of the traveling direction of the gyratory beam 131.

[0101] The rear-stage deflector 109 directs the ejection beam 132, separated from the rotating beam 131 by the front-stage deflector 108, toward the outside of the rotating track of the rotating beam 131. Figure 3 (Positive side of the X-axis) deflection.

[0102] like Figure 3 As shown, through the deflector 109 at the rear, the ejected beam 132 is directed toward the rotary track of the rotary beam 131. Figure 3 The outer side of the shaded area Figure 3 (The upper side) deflects.

[0103] like Figure 1 as well as Figure 3 As shown, the third straight section 113 includes a third converging quadrupole electromagnet 104 and a rear-end ejection deflector 109. The third converging quadrupole electromagnet 104 is positioned approximately at the center of the third straight section 113 in the direction of travel of the rotating beam 131. The third straight section 113 does not have a deflection electromagnet 102.

[0104] exist Figures 1-3 In the example shown, a diaphragm electromagnet that deflects the emitted beam 132 in the X-axis direction is used in the deflector 109 of the rear section. However, in other examples, a Lambert-type electromagnet that deflects the emitted beam 132 in the Y-axis direction can also be used in the deflector 109 of the rear section.

[0105] exist Figures 1-3 In the example shown, the third converging quadrupole electromagnet 104 is also connected to the seventh deflecting electromagnet 102, which is positioned downstream of the traveling direction of the rotating beam 131. The seventh deflecting electromagnet 102 is connected to the fourth diverging quadrupole electromagnet 103, which is positioned downstream of the traveling direction of the rotating beam 131. The fourth diverging quadrupole electromagnet 103 is connected to the eighth deflecting electromagnet 102, which is positioned downstream of the traveling direction of the rotating beam 131.

[0106] The eighth deflecting electromagnet 102 is connected to a high-frequency impact device 107 disposed downstream of the traveling direction of the rotating beam 131. The high-frequency impact device 107 is connected to a fourth converging quadrupole electromagnet 104 disposed downstream of the traveling direction of the rotating beam 131. The fourth converging quadrupole electromagnet 104 is connected to a second resonant excitation multipole electromagnet 105 disposed downstream of the traveling direction of the rotating beam 131. The second resonant excitation multipole electromagnet 105 is connected to an incident deflector 101 disposed downstream of the traveling direction of the rotating beam 131.

[0107] exist Figures 1-3 In the example shown, the synchrotron 100 includes a first linear section 111, a first deflection section 121, a second linear section 112, a second deflection section 122, and a third linear section 113. The second linear section 112 is located downstream of the first linear section 111 in the direction of travel of the rotating beam 131, and the third linear section 113 is located downstream of the second linear section 112 in the direction of travel of the rotating beam 131. The first deflection section 121 connects the first linear section 111 and the second linear section 112, and the second deflection section 122 connects the second linear section 112 and the third linear section 113.

[0108] like Figure 1As shown, the first straight section 111 and the third straight section 113 are positioned opposite each other on the rotation track of the rotary beam 131. This allows symmetry to be maintained even when the first straight section 111 and the third straight section 113 are extended.

[0109] Furthermore, the first straight section 111 and the third straight section 113 extend parallel to each other. This maintains a minimum level of symmetry.

[0110] Eight deflection electromagnets 102 are each controlled by a control unit 140 via a power supply 150. Four converging quadrupole electromagnets 104 are each controlled by a control unit 140 via a power supply 150. Four diverging quadrupole electromagnets 103 are each controlled by a control unit 140 via a power supply 150. The front-end ejection deflector 108 is controlled by a control unit 140 via a power supply 150. Although in Figure 2 It is not shown in the figure, but the deflector 109 for the later stage of injection is also controlled by the control unit 140 via the power supply 150.

[0111] The horizontal extension of the rotating beam 131 (i.e., including) Figure 3 The spread in the plane including the X-axis and S-axis) σX(s) is represented by the following equation (1). In equation (1), β is the amplitude function of the electron induction accelerator, ε is the beam emittance, D is the momentum dispersion function, and Δp / p represents the momentum spread of the beam.

[0112] [Number 1]

[0113]

[0114] The phase progression ΔμX [rad] of the electronically induced accelerated vibration is represented by the following equation (2). In equation (2), S1 represents the position of the inlet of the front section of the ejection deflector 108 in the direction of travel of the rotary beam 131 (S-axis direction), and S2 represents the position of the inlet of the rear section of the ejection deflector 109 in the direction of travel of the rotary beam 131 (S-axis direction).

[0115] [Number 2]

[0116]

[0117] Figure 4 This is a diagram illustrating an example of the phase progression of the electron-induced accelerator vibration of the emitted beam 132 set in the synchrotron (particle accelerator) 100 of the first embodiment. Figure 4 In the diagram, the vertical axis represents the phase progress ΔμX [rad] of the electron induction accelerator vibration, and the horizontal axis represents the position S in the direction of travel of the rotating beam 131 (S-axis direction).

[0118] like Figure 4As shown, in the synchrotron (particle accelerator) 100 of the first embodiment, the phase progression of the electron-induced accelerator vibration of the emitted beam 132 (more specifically, the deflection direction of the preceding emission deflector 108) is shown. Figure 3 The phase progression of the electron induction accelerator vibration of the emitted beam 132 in the same motion axis direction as the X-axis direction is set to be 270±45 degrees in the interval from the front emission deflector 108 to the rear emission deflector 109.

[0119] Specifically, the control unit 140 controls the diverging quadrupole electromagnet 103 and the converging quadrupole electromagnet 104 to ensure that the phase progression of the electron induction accelerator vibration of the emitted beam 132 is 270 ± 45 degrees in the interval from the front emission deflector 108 to the rear emission deflector 109. Then (or simultaneously), as Figure 3 As shown, the control unit 140 controls the front-end ejection deflector 108 to cause the ejection beam 132 to pass through the passage area of ​​the rotating beam 131 in the first deflection unit 121. Figure 3 The position of the emitted beam 132 near the shaded area of ​​the second deflection section 122, and passing through the passage area of ​​the rotating beam 131 in the second deflection section 122, or near the passage area of ​​the rotating beam 131 in the second deflection section 122, and passing through the passage area of ​​the third straight section 113 away from the passage area of ​​the rotating beam 131.

[0120] In detail, the control unit 140 adjusts the excitation amount of the diverging quadrupole electromagnet 103 and the convergent quadrupole electromagnet 104 via the power supply 150 so that the phase progression of the electron induction accelerator vibration of the emitted beam 132 is 270±45 degrees in the range from the front emission deflector 108 to the rear emission deflector 109.

[0121] At the same time, such as Figure 3 As shown, the control unit 140 adjusts the electric field strength of the front-end ejection deflector 108 via the power supply 150, so that the ejected beam 132 passes through the passage area of ​​the rotating beam 131 in the first deflection unit 121. Figure 3 The position of the emitted beam 132 near the shaded area of ​​the second deflection section 122, and passing through the passage area of ​​the rotating beam 131 in the second deflection section 122, or near the passage area of ​​the rotating beam 131 in the second deflection section 122, and passing through the passage area of ​​the third straight section 113 away from the passage area of ​​the rotating beam 131.

[0122] Furthermore, in the synchrotron (particle accelerator) 100 of the first embodiment, the deflection angle of the charged particle beam based on the first deflection section 121 is 60 degrees or more. Preferably, the deflection angle of the charged particle beam based on the first deflection section 121 is 90 degrees or more. Therefore, the deflection electromagnet 102 can operate as a strong converging element. Moreover, in the synchrotron (particle accelerator) 100 of the first embodiment, the combined deflection angle of the charged particle beams based on the first deflection section 121 and the second deflection section 122 is 180 degrees.

[0123] exist Figures 1-4 In the example shown, in the front-end ejection deflector 108, a portion of the gyratory beam 131 is directed toward the gyratory track of the gyratory beam 131. Figure 3 The inner side of the shaded area (closer to the slewing track of the slewing beam 131) Figure 3 The negative side of the X-axis deflects and separates into the emitted beam 132.

[0124] In other examples, a portion of the gyratory beam 131 may be directed toward the gyratory track of the gyratory beam 131 in the front-end ejection deflector 108. Figure 3 The outer side of the shaded area (closer to the slewing track of the slewing beam 131) Figure 3 The X-axis (positive side) is deflected and separated into an emission beam 132. In this example, in the rear emission deflector 109, the emission beam 132 separated from the rotating beam 131 by the front emission deflector 108 is directed toward the inner side of the rotating track of the rotating beam 131 (the positive side of the X-axis). Figure 3 (The negative side of the X-axis) deflection.

[0125] In the synchrotron (particle accelerator) 100 of the first embodiment, such as Figure 1 As shown, since the deflector 109 for the ejection section is located in the third straight section 113, it is not necessary to significantly widen the magnetic field generation area of ​​the deflecting electromagnet 102 in the deflection sections 121 and 122, thus enabling the realization of Figure 3 The trajectory of the emitted beam 132 is shown, and the deflection electromagnet 102 can be miniaturized.

[0126] Furthermore, in the synchrotron 100 of the first embodiment, the emitted beam 132 is bent by the front-end emitted deflector 108, an electrostatic device composed of a thin diaphragm electrode 108a, in a manner separating it from the rotating beam 131, and enters the first deflection section 121 in order to minimize beam loss. In the first deflection section 121, the trajectory of the emitted beam 132 is as follows... Figure 10 As shown in the existing example, it will not pass through the area of ​​the rotating beam 131 ( Figure 3 as well as Figure 10The shadowed portion is significantly separated, becoming a track like the outline of the area through which the rotating beam 131 passes. Therefore, it is also possible to suppress the generated magnetic field region of the deflecting electromagnet 102, which is expanded for the purpose of emitting the beam 132, to a minimum.

[0127] The trajectory of the emitted beam 132 in the second deflection section 122 after passing through the second straight section 112 is also the same, becoming a trajectory along the contour of the area through which the rotating beam 131 passes.

[0128] In each example of the synchrotron 100 of the first embodiment, the excitation amount of the diverging quadrupole electromagnet 103 or the converging quadrupole electromagnet 104, or both, is adjusted so that the phase progression of the electron induction accelerator vibration of the emitted beam 132 from the front-end emission deflector 108 to the rear-end emission deflector 109 is 270 ± 45 degrees. Therefore, in each example of the synchrotron 100 of the first embodiment, in the third linear section 113, the emitted beam 132 is significantly separated from the rotating beam 131 and is extracted without loss by the rear-end emission deflector 109, which is a diaphragm electromagnet, outside the synchrotron 100.

[0129] In the synchrotron 100 of the first embodiment, the emitted beam 132 through the deflection sections 121 and 122 does not pass through the position away from the center of the deflection electromagnet 102 for a long time, and therefore does not... Figure 11 As shown in (B), the existing example is strongly affected by the nonlinear magnetic field component based on the deflecting electromagnet 102. Therefore, the irradiation beam 302, which is taken from the synchrotron 100 of the first embodiment and irradiated from the irradiation device 301 including the irradiation field forming device towards the irradiated object, is as follows: Figure 11 As shown in example (A), the shape of the near-ideal two-dimensional profile distribution 302a can maintain high dose accuracy.

[0130] As described above, in the synchrotron 100 of the first embodiment, since the phase of the electron induction accelerator vibration of the emitted beam 132 and the configuration of the emission device are optimized, it is possible to realize the trajectory of the emitted beam 132 that can be transported without loss in a magnetic field generation region of the same degree as the passage region of the rotating beam 131. This can significantly reduce the magnetic field generation region required by the deflecting electromagnet 102 and reduce the overall cost involved in the deflecting electromagnet 102.

[0131] Furthermore, in the synchrotron 100 of the first embodiment, such as Figure 3 As shown, the emitted beam 132 obtains a region in the first deflection section 121 that does not pass through the rotating beam 131. Figure 3 The shadowed portion of the track deviates significantly from the trajectory, and in the second straight section 112, it achieves an inclined central track that crosses the rotating beam 131. Figure 3 The track (the shaded part) obtains the area that does not pass through the rotating beam 131 in the second deflection section 122. Figure 3 The shadowed portion of the trajectory deviates significantly. Furthermore, in the third straight section 113, where the rear-end deflector 109 is located, the rotating beam 131 and the emitted beam 132 are significantly separated. Therefore, in the synchrotron 100 of the first embodiment, the magnetic field generation region of the deflecting electromagnets 102 of the deflecting sections 121 and 122 is not significantly expanded, and the emitted beam 132 can be extracted from the synchrotron 100 without loss.

[0132] In other words, in the synchrotron 100 of the first embodiment, the miniaturization of the synchrotron 100 can be achieved without significantly widening the magnetic field generation region of the deflection electromagnet 102 in the deflection sections 121 and 122. In particular, it can suppress the manufacturing difficulty, manufacturing cost, and operating cost of the deflection electromagnet 102 when using a superconducting magnet.

[0133] <Second Implementation>

[0134] The second embodiment of the particle accelerator and particle beam therapy device of the present invention will be described below.

[0135] The particle accelerator (synchrotron 100) of the second embodiment is constructed in the same manner as the particle accelerator (synchrotron 100) of the first embodiment, except for the points described later. Therefore, the particle accelerator (synchrotron 100) according to the second embodiment can achieve the same effect as the particle accelerator (synchrotron 100) of the first embodiment, except for the points described later.

[0136] Figure 5 This is a diagram illustrating an example of a synchrotron (particle accelerator) 100 according to the second embodiment.

[0137] exist Figure 5 In the example shown, the synchrotron 100 causes the incident 201 (see reference) to... Figure 1 The linear accelerator supplies a beam of charged particles as a rotating beam 131, which is accelerated while rotating. A portion of the rotating beam 131 is emitted as an exit beam 132. The synchrotron 100 includes, for example, an incident deflector 101, eight deflecting electromagnets 102, four diverging quadrupole electromagnets 103, four converging quadrupole electromagnets 104, two resonant excitation multipole electromagnets 105, a high-frequency acceleration cavity 106, a high-frequency impact device 107, two front-stage exit deflectors 108, two rear-stage exit deflectors 109, and a control unit 140 (see reference). Figure 2 ) and multiple power supplies 150 (refer to) Figure 2 ).

[0138] That is, in Figure 5 In the example shown, with Figure 1 Compared to the example shown, one more deflector 108 is added to the front section and one more deflector 109 is added to the rear section.

[0139] To bend a charged particle beam accelerated to high energy, a high-intensity electromagnetic field is required. However, due to the discharge limit of a vacuum and the magnetic flux saturation of the iron core, it is difficult to exceed these limits in reality to increase the intensity. In such cases, the effective deflection angle is usually increased by extending the length of the deflector used for ejection. However, if other equipment is nearby, it is impossible to directly extend the length of the equipment further. Extending the straight sections 111 and 113 themselves to create space for extending the length of the equipment is also considered, but this is not preferred in terms of miniaturizing the synchrotron 100. Under these conditions, Figure 5 In the example shown, by setting the front deflector 108 and the rear deflector 109 to two units that span other devices (converging quadrupole electromagnet 104), the deflection angle relative to the emitted beam 132 can be increased without extending the straight sections 111 and 113.

[0140] exist Figure 5 In the example shown, the incident deflector 101 has the same characteristics as... Figure 1 The incident deflector 101 shown has the same function. The incident deflector 101 is connected to the first deflecting electromagnet 102 located on the downstream side of the traveling direction of the rotating beam 131.

[0141] The deflecting electromagnet 102 has the same characteristics as... Figure 1 The deflecting electromagnet 102 shown has the same function. The first deflecting electromagnet 102 is connected to the first diverging quadrupole electromagnet 103 disposed on the downstream side of the traveling direction of the rotating beam 131.

[0142] The divergent quadrupole electromagnet 103 has the same characteristics as... Figure 1 The first diverging quadrupole electromagnet 103 has the same function as the first diverging quadrupole electromagnet 103. The first diverging quadrupole electromagnet 103 is connected to the second deflecting electromagnet 102, which is disposed on the downstream side of the traveling direction of the rotating beam 131. The second deflecting electromagnet 102 is connected to the first front section ejection deflector 108, which is disposed on the downstream side of the traveling direction of the rotating beam 131.

[0143] The two front-end deflectors 108 each have a similar function to... Figure 1 The front-end ejection deflector 108 shown has the same function. The first front-end ejection deflector 108 is connected to the first converging quadrupole electromagnet 104 located on the downstream side of the travel direction of the gyratory beam 131.

[0144] Converging quadrupole electromagnet 104 has the same properties as Figure 1 The converging quadrupole electromagnet 104 shown has the same function. The first converging quadrupole electromagnet 104 is connected to the second front section of the ejection deflector 108, which is arranged on the downstream side of the travel direction of the rotating beam 131.

[0145] like Figure 5 As shown, the first straight section 111 includes a first front-end ejection deflector 108, a first converging quadrupole electromagnet 104, and a second front-end ejection deflector 108. The first converging quadrupole electromagnet 104 is positioned approximately at the center of the first straight section 111 in the direction of travel of the rotating beam 131. The first straight section 111 does not have a deflection electromagnet 102.

[0146] In other examples, the first straight section 111 may have three or more front-end ejection deflectors 108. In yet another example, the first straight section 111 may not have either the first front-end ejection deflector 108 or the second front-end ejection deflector 108.

[0147] exist Figure 5 In the example shown, the second front-end ejection deflector 108 is connected to a third deflecting electromagnet 102 positioned downstream of the traveling direction of the rotating beam 131. The third deflecting electromagnet 102 is connected to a second diverging quadrupole electromagnet 103 positioned downstream of the traveling direction of the rotating beam 131. The second diverging quadrupole electromagnet 103 is connected to a fourth deflecting electromagnet 102 positioned downstream of the traveling direction of the rotating beam 131.

[0148] like Figure 5 As shown, the first deflection section 121 includes a third deflection electromagnet 102, a second diverging quadrupole electromagnet 103, and a fourth deflection electromagnet 102.

[0149] In other examples, the first deflection section 121 may also include a deflection section quadrupole magnetic field generating mechanism that integrates the deflection electromagnet 102 and the quadrupole magnetic field coil.

[0150] exist Figure 5 In the example shown, the fourth deflecting electromagnet 102 is connected to the second converging quadrupole electromagnet 104, which is positioned downstream of the traveling direction of the rotating beam 131. The second converging quadrupole electromagnet 104 is connected to the first resonant excitation multipole electromagnet 105, which is positioned downstream of the traveling direction of the rotating beam 131. The first resonant excitation multipole electromagnet 105 is connected to the high-frequency accelerating cavity 106, which is positioned downstream of the traveling direction of the rotating beam 131.

[0151] like Figure 5 As shown, the second linear section 112 includes a second converging quadrupole electromagnet 104, a first resonant excitation multipole electromagnet 105, and a high-frequency accelerating cavity 106. The second linear section 112 does not have a deflection electromagnet 102.

[0152] exist Figure 5 In the example shown, the high-frequency acceleration cavity 106 is connected to the fifth deflecting electromagnet 102 located downstream of the traveling direction of the rotating beam 131. The fifth deflecting electromagnet 102 is connected to the third diverging quadrupole electromagnet 103 located downstream of the traveling direction of the rotating beam 131. The third diverging quadrupole electromagnet 103 is connected to the sixth deflecting electromagnet 102 located downstream of the traveling direction of the rotating beam 131.

[0153] like Figure 5 As shown, the second deflection section 122 includes a fifth deflection electromagnet 102, a third diverging quadrupole electromagnet 103, and a sixth deflection electromagnet 102.

[0154] In other examples, the second deflection section 122 may also include a deflection section quadrupole magnetic field generating mechanism that integrates the deflection electromagnet 102 and the quadrupole magnetic field coil.

[0155] exist Figure 5 In the example shown, the sixth deflecting electromagnet 102 is connected to the first rear section ejector deflector 109 disposed on the downstream side of the traveling direction of the gyratory beam 131.

[0156] The two rear-stage deflectors 109 each have a similar function to... Figure 1 The first rear-stage ejection deflector 109 has the same function. The first rear-stage ejection deflector 109 is connected to the third converging quadrupole electromagnet 104 located on the downstream side of the travel direction of the rotating beam 131.

[0157] The third converging quadrupole electromagnet 104 is connected to the second rear section ejection deflector 109, which is located on the downstream side of the traveling direction of the rotating beam 131.

[0158] like Figure 5 As shown, the third straight section 113 includes a first rear-section ejection deflector 109, a third converging quadrupole electromagnet 104, and a second rear-section ejection deflector 109. The third converging quadrupole electromagnet 104 is positioned approximately at the center of the third straight section 113 in the direction of travel of the rotating beam 131. The third straight section 113 does not have a deflection electromagnet 102.

[0159] In other examples, the third straight section 113 may have three or more rear-section ejection deflectors 109. In yet another example, the third straight section 113 may not have either the first rear-section ejection deflector 109 or the second rear-section ejection deflector 109.

[0160] exist Figure 5 In the example shown, the third converging quadrupole electromagnet 104 is also connected to the seventh deflecting electromagnet 102, which is positioned downstream of the traveling direction of the rotating beam 131. The seventh deflecting electromagnet 102 is connected to the fourth diverging quadrupole electromagnet 103, which is positioned downstream of the traveling direction of the rotating beam 131. The fourth diverging quadrupole electromagnet 103 is connected to the eighth deflecting electromagnet 102, which is positioned downstream of the traveling direction of the rotating beam 131.

[0161] The eighth deflecting electromagnet 102 is connected to a high-frequency impact device 107 disposed downstream of the traveling direction of the rotating beam 131. The high-frequency impact device 107 is connected to a fourth converging quadrupole electromagnet 104 disposed downstream of the traveling direction of the rotating beam 131. The fourth converging quadrupole electromagnet 104 is connected to a second resonant excitation multipole electromagnet 105 disposed downstream of the traveling direction of the rotating beam 131. The second resonant excitation multipole electromagnet 105 is connected to an incident deflector 101 disposed downstream of the traveling direction of the rotating beam 131.

[0162] Figure 14 This is a diagram showing the relationship between the passage area of ​​the rotating beam 131 and the trajectory of the emitted beam 132 in the synchrotron (particle accelerator) 100 of the second embodiment. Figure 14 In the diagram, the S-axis direction indicates the travel direction of the rotating beam 131. The X-axis contained in the plane orthogonal to the S-axis corresponds to the deflection direction of the deflection electromagnet 102, the deflection direction of the front ejection deflector 108, and the deflection direction of the rear ejection deflector 109.

[0163] In the synchrotron 100 of the second embodiment, such as Figure 14 As shown, before the rotating beam 131 is converged by the first converging quadrupole electromagnet 104, a portion of the rotating beam 131 is directed toward the rotating track of the rotating beam 131 by the diaphragm electrode 108a of the first front-end ejection deflector 108. Figure 14 The inner side of the shaded area (closer to the slewing track of the slewing beam 131) Figure 14 (The lower side) deflects and separates into the emitted beam 132.

[0164] <Third Implementation Method>

[0165] The third embodiment of the particle accelerator and particle beam therapy device of the present invention will be described below.

[0166] The particle accelerator (synchrotron 100) of the third embodiment is constructed in the same manner as the particle accelerator (synchrotron 100) of the second embodiment, except for the points described later. Therefore, the particle accelerator (synchrotron 100) according to the third embodiment can achieve the same effect as the particle accelerator (synchrotron 100) of the second embodiment, except for the points described later.

[0167] Figure 6 This is a diagram illustrating an example of a synchrotron (particle accelerator) 100 according to the third embodiment.

[0168] In the above Figure 1 as well as Figure 5 In the example shown, the lengths of the first straight section 111, the second straight section 112, and the third straight section 113 are equal.

[0169] The deflection angle ratio of the front-end deflector 108 and the rear-end deflector 109 needs to be adjusted. Figure 1 as well as Figure 5 The example shown is an example of adding cases, such as Figure 6 The example shown illustrates how a synchrotron 100 is constructed.

[0170] Specifically, in Figure 6 In the example shown, the length of the first straight section 111 is equal to the length of the third straight section 113, and both the first straight section 111 and the third straight section 113 are longer than the second straight section 112. Figure 6 As shown in the example, instead of extending the second straight section 112, the first straight section 111, which is configured for the front-end ejection deflector 108, and the third straight section 113, which is configured for the rear-end ejection deflector 109, are extended. This allows the circumference of the synchrotron 100 to be shortened as much as possible while maintaining the minimum equipment configuration symmetry required for the synchrotron 100.

[0171] The relationship between the passage region of the rotating beam 131 and the trajectory of the emitted beam 132 in the synchrotron (particle accelerator) 100 of the third embodiment is as follows: Figure 14 The relationship shown is the same as the previous one.

[0172] <Fourth Implementation>

[0173] The fourth embodiment of the particle accelerator and particle beam therapy device of the present invention will be described below.

[0174] The particle accelerator (synchrotron 100) of the fourth embodiment is constructed in the same manner as the particle accelerator (synchrotron 100) of the second embodiment, except for the points described later. Therefore, the particle accelerator (synchrotron 100) according to the fourth embodiment can achieve the same effect as the particle accelerator (synchrotron 100) of the second embodiment, except for the points described later.

[0175] Figure 7 This is a diagram illustrating an example of a synchrotron (particle accelerator) 100 according to the fourth embodiment.

[0176] exist Figure 7 In the example shown, the synchrotron 100 causes the incident 201 (see reference) to... Figure 1 The linear accelerator supplies a beam of charged particles as a rotating beam 131, which is accelerated while rotating. A portion of the rotating beam 131 is emitted as an exit beam 132. The synchrotron 100 includes, for example, an incident deflector 101, eight deflecting electromagnets 102, four converging quadrupole electromagnets 104, two resonant excitation multipole electromagnets 105, a high-frequency acceleration cavity 106, a high-frequency impact device 107, two front-stage exit deflectors 108, two rear-stage exit deflectors 109, and a control unit 140 (see reference). Figure 2 ) and multiple power supplies 150 (refer to) Figure 2 ).

[0177] That is, in Figure 7 In the example shown, with Figure 5 Compared to the example shown, the synchrotron 100 does not have four diverging quadrupole electromagnets 103 forming a shorter straight section (see reference). Figure 5 ).

[0178] exist Figure 7 In the example shown, the incident deflector 101 has the same characteristics as... Figure 1 The incident deflector 101 shown has the same function. The incident deflector 101 is connected to the first deflecting electromagnet 102 located on the downstream side of the traveling direction of the rotating beam 131.

[0179] The deflecting electromagnet 102 has the same characteristics as... Figure 1 The deflecting electromagnet 102 shown has the same function. The first deflecting electromagnet 102 is connected to the second deflecting electromagnet 102, which is disposed on the downstream side of the travel direction of the gyratory beam 131. The second deflecting electromagnet 102 is connected to the first front section ejection deflector 108, which is disposed on the downstream side of the travel direction of the gyratory beam 131.

[0180] The two front-end deflectors 108 each have a similar function to... Figure 1The front-end ejection deflector 108 shown has the same function. The first front-end ejection deflector 108 is connected to the first converging quadrupole electromagnet 104 located on the downstream side of the travel direction of the gyratory beam 131.

[0181] Converging quadrupole electromagnet 104 has the same properties as Figure 1 The converging quadrupole electromagnet 104 shown has the same function. The first converging quadrupole electromagnet 104 is connected to the second front section of the ejection deflector 108, which is arranged on the downstream side of the travel direction of the rotating beam 131.

[0182] like Figure 7 As shown, the first straight section 111 includes a first front-end ejection deflector 108, a first converging quadrupole electromagnet 104, and a second front-end ejection deflector 108. The first converging quadrupole electromagnet 104 is positioned approximately at the center of the first straight section 111 in the direction of travel of the rotating beam 131. The first straight section 111 does not have a deflection electromagnet 102.

[0183] In other examples, the first straight section 111 may have three or more front-end ejection deflectors 108. In yet another example, the first straight section 111 may not have either the first front-end ejection deflector 108 or the second front-end ejection deflector 108.

[0184] exist Figure 7 In the example shown, the second front-end deflector 108 is connected to a third deflecting electromagnet 102 located downstream of the traveling direction of the cyclone beam 131. The third deflecting electromagnet 102 is connected to a fourth deflecting electromagnet 102 located downstream of the traveling direction of the cyclone beam 131.

[0185] like Figure 7 As shown, the first deflection section 121 includes a third deflection electromagnet 102 and a fourth deflection electromagnet 102.

[0186] In other examples, the first deflection section 121 may also include a deflection section quadrupole magnetic field generating mechanism that integrates the deflection electromagnet 102 and the quadrupole magnetic field coil.

[0187] exist Figure 7 In the example shown, the fourth deflecting electromagnet 102 is connected to the second converging quadrupole electromagnet 104, which is positioned downstream of the traveling direction of the rotating beam 131. The second converging quadrupole electromagnet 104 is connected to the first resonant excitation multipole electromagnet 105, which is positioned downstream of the traveling direction of the rotating beam 131. The first resonant excitation multipole electromagnet 105 is connected to the high-frequency accelerating cavity 106, which is positioned downstream of the traveling direction of the rotating beam 131.

[0188] like Figure 7 As shown, the second linear section 112 includes a second converging quadrupole electromagnet 104, a first resonant excitation multipole electromagnet 105, and a high-frequency accelerating cavity 106. The second linear section 112 does not have a deflection electromagnet 102.

[0189] exist Figure 7 In the example shown, the high-frequency acceleration cavity 106 is connected to the fifth deflecting electromagnet 102 located downstream of the traveling direction of the rotating beam 131. The fifth deflecting electromagnet 102 is connected to the sixth deflecting electromagnet 102 located downstream of the traveling direction of the rotating beam 131.

[0190] like Figure 7 As shown, the second deflection section 122 includes a fifth deflection electromagnet 102 and a sixth deflection electromagnet 102.

[0191] In other examples, the second deflection section 122 may also include a deflection section quadrupole magnetic field generating mechanism that integrates the deflection electromagnet 102 and the quadrupole magnetic field coil.

[0192] exist Figure 7 In the example shown, the sixth deflecting electromagnet 102 is connected to the first rear section ejector deflector 109 disposed on the downstream side of the traveling direction of the gyratory beam 131.

[0193] The two rear-stage deflectors 109 each have a similar function to... Figure 1 The first rear-stage ejection deflector 109 has the same function. The first rear-stage ejection deflector 109 is connected to the third converging quadrupole electromagnet 104 located on the downstream side of the travel direction of the rotating beam 131.

[0194] The third converging quadrupole electromagnet 104 is connected to the second rear section ejection deflector 109, which is located on the downstream side of the traveling direction of the rotating beam 131.

[0195] like Figure 7 As shown, the third straight section 113 includes a first rear-section ejection deflector 109, a third converging quadrupole electromagnet 104, and a second rear-section ejection deflector 109. The third converging quadrupole electromagnet 104 is positioned approximately at the center of the third straight section 113 in the direction of travel of the rotating beam 131. The third straight section 113 does not have a deflection electromagnet 102.

[0196] In other examples, the third straight section 113 may have three or more rear-section ejection deflectors 109. In yet another example, the third straight section 113 may not have either the first rear-section ejection deflector 109 or the second rear-section ejection deflector 109.

[0197] exist Figure 7 In the example shown, the third converging quadrupole electromagnet 104 is also connected to the seventh deflecting electromagnet 102 located downstream of the traveling direction of the gyratory beam 131. The seventh deflecting electromagnet 102 is connected to the eighth deflecting electromagnet 102 located downstream of the traveling direction of the gyratory beam 131.

[0198] The eighth deflecting electromagnet 102 is connected to a high-frequency impact device 107 disposed downstream of the traveling direction of the rotating beam 131. The high-frequency impact device 107 is connected to a fourth converging quadrupole electromagnet 104 disposed downstream of the traveling direction of the rotating beam 131. The fourth converging quadrupole electromagnet 104 is connected to a second resonant excitation multipole electromagnet 105 disposed downstream of the traveling direction of the rotating beam 131. The second resonant excitation multipole electromagnet 105 is connected to an incident deflector 101 disposed downstream of the traveling direction of the rotating beam 131.

[0199] exist Figure 7 In the example shown, the control unit 140 adjusts the quadrupole electromagnet 104 of the first linear section 111, the quadrupole electromagnet 104 of the second linear section 112, and the quadrupole electromagnet 104 of the third linear section 113 so that the phase progression of the electron induction accelerator vibration of the emitted beam 132 is 270±45 degrees in the interval from the front emission deflector 108 to the rear emission deflector 109.

[0200] In detail, the control unit 140 adjusts the quadrupole electromagnet 104 of the first linear section 111, the quadrupole electromagnet 104 of the second linear section 112, and the quadrupole electromagnet 104 of the third linear section 113 so that the phase progression of the electron induction accelerator vibration of the emitted beam 132 is 270±45 degrees in the range from the front emission deflector 108 to the rear emission deflector 109.

[0201] At the same time, the control unit 140 adjusts the electric field strength of the front-end ejection deflector 108 so that the ejection beam 132 passes near the passage area of ​​the rotating beam 131 in the first deflection section 121, and passes through the passage area of ​​the rotating beam 131 in the second deflection section 122, or passes near the passage area of ​​the rotating beam 131 in the second deflection section 122, and passes through a position in the third straight section 113 away from the passage area of ​​the rotating beam 131.

[0202] The relationship between the passage region of the rotating beam 131 and the trajectory of the emitted beam 132 in the synchrotron (particle accelerator) 100 of the fourth embodiment becomes... Figure 14 The relationship shown is the same as the previous one.

[0203] <Fifth Implementation>

[0204] The fifth embodiment of the particle accelerator and particle beam therapy device of the present invention will be described below.

[0205] The particle accelerator (synchrotron 100) of the fifth embodiment is constructed in the same manner as the particle accelerator (synchrotron 100) of the fourth embodiment, except for the points described later. Therefore, the particle accelerator (synchrotron 100) according to the fifth embodiment can achieve the same effect as the particle accelerator (synchrotron 100) of the fourth embodiment, except for the points described later.

[0206] Figure 8 This is a diagram illustrating an example of a synchrotron (particle accelerator) 100 according to the fifth embodiment.

[0207] exist Figure 8 In the example shown, the synchrotron 100 causes the incident 201 (see reference) to... Figure 1 The linear accelerator supplies a beam of charged particles as a rotating beam 131, which is accelerated while rotating. A portion of the rotating beam 131 is emitted as an exit beam 132. The synchrotron 100 includes, for example, an incident deflector 101, four deflecting electromagnets 102, four converging quadrupole electromagnets 104, two resonant excitation multipole electromagnets 105, a high-frequency acceleration cavity 106, a high-frequency impact device 107, two front-stage exit deflectors 108, two rear-stage exit deflectors 109, and a control unit 140 (see reference). Figure 2 ) and a power supply of 150 (refer to) Figure 2 ).

[0208] That is, in Figure 8 In the example shown, Figure 7 In the example shown, the first deflecting electromagnet 102 and the second deflecting electromagnet 102 are combined to constitute the first deflecting electromagnet 102. Furthermore, in Figure 8 In the example shown, Figure 7 The third and fourth deflecting electromagnets 102 in the example shown are combined to form the second deflecting electromagnet 102. Figure 7 The fifth and sixth deflecting electromagnets 102 in the example shown are combined to form the third deflecting electromagnet 102. Figure 7In the example shown, the seventh deflecting electromagnet 102 and the eighth deflecting electromagnet 102 are combined to form the fourth deflecting electromagnet 102.

[0209] exist Figure 8 In the example shown, the incident deflector 101 has the same characteristics as... Figure 1 The incident deflector 101 shown has the same function. The incident deflector 101 is connected to the first deflecting electromagnet 102 located on the downstream side of the traveling direction of the rotating beam 131.

[0210] The deflecting electromagnet 102 has the same characteristics as... Figure 1 The deflecting electromagnet 102 shown has the same function. The first deflecting electromagnet 102 is connected to the first front section of the ejector deflector 108, which is arranged on the downstream side of the travel direction of the rotating beam 131.

[0211] The two front-end deflectors 108 each have the same characteristics as... Figure 1 The front-end ejection deflector 108 shown has the same function. The first front-end ejection deflector 108 is connected to the first converging quadrupole electromagnet 104 located on the downstream side of the travel direction of the gyratory beam 131.

[0212] Converging quadrupole electromagnet 104 has the same properties as Figure 1 The converging quadrupole electromagnet 104 shown has the same function. The first converging quadrupole electromagnet 104 is connected to the second front section of the ejection deflector 108, which is arranged on the downstream side of the travel direction of the rotating beam 131.

[0213] like Figure 8 As shown, the first straight section 111 includes a first front-end ejection deflector 108, a first converging quadrupole electromagnet 104, and a second front-end ejection deflector 108. The first converging quadrupole electromagnet 104 is positioned approximately at the center of the first straight section 111 in the direction of travel of the rotating beam 131. The first straight section 111 does not have a deflection electromagnet 102.

[0214] In other examples, the first straight section 111 may have three or more front-end ejection deflectors 108. In yet another example, the first straight section 111 may not have either the first front-end ejection deflector 108 or the second front-end ejection deflector 108.

[0215] exist Figure 8 In the example shown, the second front-end ejection deflector 108 is connected to a second deflecting electromagnet 102 disposed downstream in the direction of travel of the cyclone beam 131. The second deflecting electromagnet 102 is connected to a second converging quadrupole electromagnet 104 disposed downstream in the direction of travel of the cyclone beam 131.

[0216] like Figure 8 As shown, the first deflection section 121 is equipped with a second deflection electromagnet 102.

[0217] In other examples, the first deflection section 121 may also include a deflection section quadrupole magnetic field generating mechanism that integrates the deflection electromagnet 102 and the quadrupole magnetic field coil.

[0218] exist Figure 8 In the example shown, the second converging quadrupole electromagnet 104 is connected to the first resonant excitation multipole electromagnet 105, which is disposed downstream in the direction of travel of the rotating beam 131. The first resonant excitation multipole electromagnet 105 is connected to the high-frequency acceleration cavity 106, which is disposed downstream in the direction of travel of the rotating beam 131.

[0219] like Figure 8 As shown, the second linear section 112 includes a second converging quadrupole electromagnet 104, a first resonant excitation multipole electromagnet 105, and a high-frequency accelerating cavity 106. The second linear section 112 does not have a deflection electromagnet 102.

[0220] exist Figure 8 In the example shown, the high-frequency acceleration cavity 106 is connected to a third deflecting electromagnet 102 disposed on the downstream side of the travel direction of the rotating beam 131. The third deflecting electromagnet 102 is connected to a first rear-stage ejection deflector 109 disposed on the downstream side of the travel direction of the rotating beam 131.

[0221] like Figure 8 As shown, the second deflection section 122 is equipped with a third deflection electromagnet 102.

[0222] In other examples, the second deflection section 122 may also include a deflection section quadrupole magnetic field generating mechanism that integrates the deflection electromagnet 102 and the quadrupole magnetic field coil.

[0223] exist Figure 8 In the example shown, each of the two rear-stage ejection deflectors 109 has a similar function to... Figure 1 The first rear-stage ejection deflector 109 has the same function. The first rear-stage ejection deflector 109 is connected to the third converging quadrupole electromagnet 104 located on the downstream side of the travel direction of the rotating beam 131.

[0224] The third converging quadrupole electromagnet 104 is connected to the second rear section ejection deflector 109, which is located on the downstream side of the traveling direction of the rotating beam 131.

[0225] like Figure 8As shown, the third straight section 113 includes a first rear-section ejection deflector 109, a third converging quadrupole electromagnet 104, and a second rear-section ejection deflector 109. The third converging quadrupole electromagnet 104 is positioned approximately at the center of the third straight section 113 in the direction of travel of the rotating beam 131. The third straight section 113 does not have a deflection electromagnet 102.

[0226] In other examples, the third straight section 113 may have three or more rear-section ejection deflectors 109. In yet another example, the third straight section 113 may not have either the first rear-section ejection deflector 109 or the second rear-section ejection deflector 109.

[0227] exist Figure 8 In the example shown, the third converging quadrupole electromagnet 104 is also connected to the fourth deflecting electromagnet 102, which is disposed downstream of the traveling direction of the rotating beam 131. The fourth deflecting electromagnet 102 is connected to the high-frequency impact device 107, which is disposed downstream of the traveling direction of the rotating beam 131.

[0228] The high-frequency impact device 107 is connected to a fourth converging quadrupole electromagnet 104 disposed downstream of the traveling direction of the rotating beam 131. The fourth converging quadrupole electromagnet 104 is connected to a second resonant excitation multipole electromagnet 105 disposed downstream of the traveling direction of the rotating beam 131. The second resonant excitation multipole electromagnet 105 is connected to an incident deflector 101 disposed downstream of the traveling direction of the rotating beam 131.

[0229] The relationship between the passage region of the rotating beam 131 and the trajectory of the emitted beam 132 in the synchrotron (particle accelerator) 100 of the fifth embodiment becomes... Figure 14 The relationship shown is the same as the previous one.

[0230] <Sixth Implementation Method>

[0231] The sixth embodiment of the particle accelerator and particle beam therapy device of the present invention will be described below.

[0232] The particle accelerator (synchrotron 100) of the sixth embodiment is constructed in the same manner as the particle accelerator (synchrotron 100) of the fourth embodiment, except for the points described later. Therefore, the particle accelerator (synchrotron 100) according to the sixth embodiment can achieve the same effect as the particle accelerator (synchrotron 100) of the fourth embodiment, except for the points described later.

[0233] Figure 12 This is a diagram illustrating an example of a synchrotron (particle accelerator) 100 according to the sixth embodiment.

[0234] exist Figure 12 In the example shown, the synchrotron 100 causes the incident 201 (see reference) to... Figure 1 The linear accelerator supplies a beam of charged particles as a rotating beam 131, which is accelerated while rotating. A portion of the rotating beam 131 is emitted as an exit beam 132. The synchrotron 100 includes, for example, an incident deflector 101, eight deflecting electromagnets 102, four converging quadrupole electromagnets 104, two resonant excitation multipole electromagnets 105, a high-frequency acceleration cavity 106, a high-frequency impact device 107, a front-stage exit deflector 108, two rear-stage exit deflectors 109, and a control unit 140 (see reference). Figure 2 ) and multiple power supplies 150 (refer to) Figure 2 ).

[0235] That is, in Figure 7 In the example shown, the synchrotron 100 has two front-end ejection deflectors 108, and in contrast, Figure 12 In the example shown, the synchrotron 100 has a front-end ejection deflector 108.

[0236] exist Figure 12 In the example shown, the incident deflector 101 has the same characteristics as... Figure 1 The incident deflector 101 shown has the same function. The incident deflector 101 is connected to the first deflecting electromagnet 102 located on the downstream side of the traveling direction of the rotating beam 131.

[0237] The deflecting electromagnet 102 has the same characteristics as... Figure 1 The deflecting electromagnet 102 shown has the same function. The first deflecting electromagnet 102 is connected to the second deflecting electromagnet 102, which is disposed downstream of the traveling direction of the rotating beam 131. The second deflecting electromagnet 102 is connected to the first converging quadrupole electromagnet 104, which is disposed downstream of the traveling direction of the rotating beam 131.

[0238] Converging quadrupole electromagnet 104 has the same properties as Figure 1 The converging quadrupole electromagnet 104 shown has the same function. The first converging quadrupole electromagnet 104 is connected to the front section of the ejection deflector 108, which is arranged on the downstream side of the traveling direction of the rotating beam 131.

[0239] The front-end deflector 108 has a similar function to... Figure 1 The front-end ejection deflector 108 has the same function. The front-end ejection deflector 108 is connected to the third deflection electromagnet 102 located on the downstream side of the travel direction of the gyratory beam 131.

[0240] like Figure 12As shown, the first straight section 111 includes a first converging quadrupole electromagnet 104 and a front-end ejection deflector 108. The first converging quadrupole electromagnet 104 is positioned approximately at the center of the first straight section 111 in the direction of travel of the rotating beam 131. The first straight section 111 does not have a deflection electromagnet 102.

[0241] The relationship between the passage region of the rotating beam 131 and the trajectory of the emitted beam 132 in the synchrotron (particle accelerator) 100 of the sixth embodiment becomes... Figure 3 The relationship shown is the same as the previous one.

[0242] <Seventh Implementation>

[0243] The seventh embodiment of the particle accelerator and particle beam therapy device of the present invention will be described below.

[0244] The particle accelerator (synchrotron 100) of the seventh embodiment is constructed in the same manner as the particle accelerator (synchrotron 100) of the fifth embodiment, except for the points described later. Therefore, the particle accelerator (synchrotron 100) according to the seventh embodiment can achieve the same effect as the particle accelerator (synchrotron 100) of the fifth embodiment, except for the points described later.

[0245] Figure 13 This is a diagram illustrating an example of a synchrotron (particle accelerator) 100 according to the seventh embodiment.

[0246] exist Figure 13 In the example shown, the synchrotron 100 causes the incident 201 (see reference) to... Figure 1 The linear accelerator supplies a beam of charged particles as a rotating beam 131, which is accelerated while rotating. A portion of the rotating beam 131 is emitted as an exit beam 132. The synchrotron 100 includes, for example, an incident deflector 101, four deflecting electromagnets 102, four converging quadrupole electromagnets 104, two resonant excitation multipole electromagnets 105, a high-frequency acceleration cavity 106, a high-frequency impact device 107, a front-stage exit deflector 108, two rear-stage exit deflectors 109, and a control unit 140 (see reference). Figure 2 ) and multiple power supplies 150 (refer to) Figure 2 ).

[0247] That is, in Figure 8 In the example shown, the synchrotron 100 has two front-end ejection deflectors 108, and in contrast, Figure 13 In the example shown, the synchrotron 100 has a front-end ejection deflector 108.

[0248] exist Figure 13In the example shown, the incident deflector 101 has the same characteristics as... Figure 1 The incident deflector 101 shown has the same function. The incident deflector 101 is connected to the first deflecting electromagnet 102 located on the downstream side of the traveling direction of the rotating beam 131.

[0249] The deflecting electromagnet 102 has the same characteristics as... Figure 1 The deflecting electromagnet 102 shown has the same function. The first deflecting electromagnet 102 is connected to the first converging quadrupole electromagnet 104 located on the downstream side of the traveling direction of the rotating beam 131.

[0250] Converging quadrupole electromagnet 104 has the same properties as Figure 1 The converging quadrupole electromagnet 104 shown has the same function. The first converging quadrupole electromagnet 104 is connected to the front section of the ejection deflector 108, which is arranged on the downstream side of the traveling direction of the rotating beam 131.

[0251] The front-end deflector 108 has a similar function to... Figure 1 The front-end ejection deflector 108 has the same function. The front-end ejection deflector 108 is connected to a second deflection electromagnet 102 located on the downstream side of the travel direction of the rotary beam 131.

[0252] like Figure 13 As shown, the first straight section 111 includes a first converging quadrupole electromagnet 104 and a front-end ejection deflector 108. The first converging quadrupole electromagnet 104 is positioned approximately at the center of the first straight section 111 in the direction of travel of the rotating beam 131. The first straight section 111 does not have a deflection electromagnet 102.

[0253] The relationship between the passage region of the rotating beam 131 and the trajectory of the emitted beam 132 in the synchrotron (particle accelerator) 100 of the seventh embodiment becomes... Figure 3 The relationship shown is the same as the previous one.

[0254] The embodiments described above illustrate how the present invention can be carried out. However, the present invention is not limited to these embodiments in any way, and various modifications and substitutions can be applied without departing from the spirit of the invention. The structures described in the above embodiments and examples can also be combined.

[0255] Explanation of reference numerals in the attached figures

[0256] 100: Synchrotron (particle accelerator); 101: Incident deflector; 102: Deflecting electromagnet; 103: (for divergence) Quadrupole electromagnet; 104: (for convergence) Quadrupole electromagnet; 105: Multipole electromagnet for resonant excitation; 106: High-frequency accelerating cavity; 107: High-frequency impact device; 108: Front-stage ejection deflector; 108a: Diaphragm electrode; 109: Rear-stage ejection deflector; 111: (First) linear section; 112: (Second) linear section; 113: (Third) Straight section; 121: (First) Deflection section; 122: (Second) Deflection section; 131: Rotating beam; 132: Emission beam; 140: Control section; 150: Power supply; 201: Receiver; 301: Irradiation device; 302: Irradiation beam; 302a: Two-dimensional profile distribution; 302b: Horizontal projection profile; 302c: Vertical projection profile; 302a': Two-dimensional profile distribution; 302b': Horizontal projection profile; 302c': Vertical projection profile.

Claims

1. A particle accelerator that accelerates a beam of charged particles while it rotates as a rotating beam, and emits a portion of the rotating beam as an outgoing beam, wherein, The particle accelerator has the following features: Multiple deflection sections, each equipped with a deflecting electromagnet; Multiple straight sections, without the aforementioned deflecting electromagnet; as well as Control Department The plurality of straight sections include: The first straight section has a front-end deflector for injection; The second straight section, positioned downstream of the first straight section in the direction of travel of the rotating beam, has a four-pole electromagnet; and The third straight section, positioned downstream of the second straight section in the direction of travel of the rotating beam, has a deflector for the rear section. The plurality of deflection sections include: A first deflection section connects the first straight section and the second straight section; and The second deflection section connects the second straight section and the third straight section. The front-end ejection deflector causes a portion of the rotating beam to deflect towards either the inside or the outside of the rotating beam's trajectory, thus separating it into the ejection beam. The ejection deflector in the rear section deflects the ejection beam separated from the gyratory beam by the ejection deflector in the front section toward either the inner or outer side of the gyratory beam's gyratory track. The control unit controls at least the quadrupole electromagnet so that the phase progression of the electron induction accelerator vibration of the emitted beam is 270±45 degrees in the interval from the front emission deflector to the rear emission deflector.

2. The particle accelerator according to claim 1, wherein, The control unit controls at least the quadrupole electromagnet so that the phase progression of the electron induction accelerator vibration of the emitted beam is 270±45 degrees in the interval from the front emission deflector to the rear emission deflector. The control unit controls the front-end ejection deflector to cause the ejected beam to pass near the passage area of ​​the rotating beam in the first deflection unit, and to cause the ejected beam to pass through the passage area of ​​the rotating beam in the second deflection unit, or to pass near the passage area of ​​the rotating beam in the second deflection unit, and to cause the ejected beam to pass through a position in the third straight section away from the passage area of ​​the rotating beam.

3. The particle accelerator according to claim 1, wherein, The first straight section and the third straight section are positioned opposite each other on the rotation track of the rotating bundle.

4. The particle accelerator according to claim 3, wherein, The first straight section and the third straight section extend parallel to each other.

5. The particle accelerator according to claim 1, wherein, Each of the plurality of deflection sections has a deflection electromagnet and a four-pole electromagnet for the deflection section, or has a four-pole magnetic field generating mechanism for the deflection section that integrates the deflection electromagnet and the four-pole magnetic field coil. Each of the plurality of linear sections has the aforementioned four-pole electromagnet. The control unit adjusts the excitation amount of the quadrupole electromagnets of the deflection section or the excitation amount of the quadrupole magnetic field generating mechanism of the deflection section, as well as the excitation amount of the quadrupole electromagnets of the linear section, so that the phase progression of the electron induction accelerator vibration of the emitted beam is 270±45 degrees in the interval from the front-end emission deflector to the rear-end emission deflector.

6. The particle accelerator according to claim 5, wherein, The control unit adjusts the excitation amount of the quadrupole electromagnets for each of the plurality of deflection sections, or the excitation amount of the quadrupole magnetic field generating mechanism for the deflection section, and the excitation amount of the quadrupole electromagnets for each of the plurality of linear sections, so that the phase progression of the electron induction accelerator vibration of the emitted beam is 270±45 degrees in the interval from the front-end emission deflector to the rear-end emission deflector. The control unit adjusts the electric field strength of the front-end deflector so that the emitted beam passes near the passage area of ​​the rotating beam in the first deflector and passes through the passage area of ​​the rotating beam in the second deflector, or passes near the passage area of ​​the rotating beam in the second deflector and passes through a position in the third straight section away from the passage area of ​​the rotating beam.

7. The particle accelerator according to claim 1, wherein, Each of the plurality of linear sections has the aforementioned four-pole electromagnet. The control unit adjusts the quadrupole electromagnets of each of the plurality of linear sections so that the phase progression of the electron induction accelerator vibration of the emitted beam is 270±45 degrees in the interval from the front emission deflector to the rear emission deflector.

8. The particle accelerator according to claim 7, wherein, The control unit adjusts the quadrupole electromagnets of each of the plurality of linear sections so that the phase progression of the electron induction accelerator vibration of the emitted beam is 270±45 degrees in the interval from the front emission deflector to the rear emission deflector. The control unit adjusts the electric field strength of the front-end deflector so that the emitted beam passes near the passage area of ​​the rotating beam in the first deflector and passes through the passage area of ​​the rotating beam in the second deflector, or passes near the passage area of ​​the rotating beam in the second deflector and passes through a position in the third straight section away from the passage area of ​​the rotating beam.

9. The particle accelerator according to claim 1, wherein, The deflection angle of the charged particle beam based on the first deflection section is 60 degrees or more.

10. The particle accelerator according to claim 1, wherein, The total deflection angle of the charged particle beam based on the first deflection section and the second deflection section is 180 degrees.

11. The particle accelerator according to claim 1, wherein, The first straight section and the third straight section each have the four-pole electromagnet. The ejection deflector of the front section is positioned downstream of the quadrupole electromagnet of the first straight section in the direction of travel of the rotating beam. The ejection deflector of the rear section is located downstream of the quadrupole electromagnet of the third straight section in the direction of travel of the rotating beam.

12. The particle accelerator according to claim 1, wherein, The four-pole electromagnet of the first straight section is positioned approximately at the center of the first straight section in the direction of travel of the rotating beam. The four-pole electromagnet of the third straight section is positioned approximately at the center of the third straight section in the direction of travel of the rotating beam.

13. A particle beam therapy device, wherein, The particle beam therapy device comprises: the particle accelerator as described in claim 1; and... An irradiation device delivers the charged particle beam extracted from the particle accelerator as the emitted beam and irradiates the target.

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