Primary harmonic adjusting system of cyclotron

Abstract

The invention discloses a cyclotron first harmonic adjusting system, and the system comprises a cyclotron magnet which is provided with a plurality of through holes; each adjusting assembly comprises an adjusting rod and a driving device, the multiple adjusting rods are arranged in the multiple through holes in an axially movable mode, the multiple driving devices are arranged on the cyclotron magnet and are in transmission connection with the multiple adjusting rods, and the adjusting rods are soft magnetic parts. The cyclotron first harmonic adjusting system has the advantages of being high in stability, high in adjusting efficiency and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of medical cyclotron accelerators, and in particular to a cyclotron primary harmonic regulation system. Background Art

[0002] The magnetic field in the midplane of a medical cyclotron will affect the trajectory of the charged particle beam. During the beam tuning phase, the path of the beam movement needs to be adjusted by adjusting the magnetic field in the midplane. The first harmonic of the magnetic field is an important parameter that affects the midplane magnetic field.

[0003] In the cyclotron accelerator in the related art, when adjusting the first harmonic, an energized coil or a soft magnetic rod is used to adjust the magnetic field size at different positions. The energized coil is an active component that requires continuous power supply from an external power source and has poor stability. When adjusting with a soft magnetic rod, the position of the soft magnetic rod needs to be manually adjusted when the accelerator is not in operation (opening the cavity). Since multiple adjustments are required, the cavity needs to be opened frequently, resulting in a long time consumption. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a cyclotron primary harmonic regulation system, which has the advantages of strong stability and high regulation efficiency.

[0005] To achieve the above-mentioned purpose, a cyclotron first harmonic regulation system is proposed according to an embodiment of the present invention, the cyclotron first harmonic regulation system comprising: a cyclotron magnet, wherein a plurality of through holes are provided on the cyclotron magnet; a plurality of regulation components, each of the regulation components comprising an regulation rod and a driving device, the plurality of regulation rods are respectively axially movably arranged in the plurality of through holes, the plurality of driving devices are arranged on the cyclotron magnet and are respectively transmission-connected to the plurality of regulation rods, and the regulation rods are soft magnetic parts.

[0006] The cyclotron first harmonic regulation system according to the embodiment of the present invention has the advantages of strong stability, high regulation efficiency, etc.

[0007] In addition, the cyclotron primary harmonic regulation system according to the above embodiment of the present invention may also have the following additional technical features:

[0008] According to an embodiment of the present invention, the driving device is a motor, the motor is connected to a transmission rod, one of the transmission rod and the adjustment rod is provided with an internal thread and the other is provided with an external thread, and the internal thread and the external thread are meshed.

[0009] According to an embodiment of the present invention, the through hole is a waist-shaped hole, and the radial cross-section of at least a portion of the adjusting rod is waist-shaped to match the shape of the through hole to limit the relative rotation of the through hole and the adjusting rod.

[0010] According to an embodiment of the present invention, the transmission rod is made of non-magnetic material.

[0011] According to one embodiment of the present invention, a plurality of flange seats are provided on the outer end surface of the cyclotron magnet, and the plurality of flange seats are respectively located at the plurality of through holes, and the transmission rod is rotatably engaged in the flange seat, and a pressure cover is provided on the flange seat, and an annular boss is provided on the outer peripheral surface of the transmission rod, and the annular boss is stopped between the flange seat and the pressure cover in the axial direction.

[0012] According to an embodiment of the present invention, a bearing is provided between the transmission rod and the flange seat.

[0013] According to an embodiment of the present invention, sealing rings are provided between the flange seat and the cyclotron magnet and between the flange seat and the transmission rod.

[0014] According to an embodiment of the present invention, the motor is transmission-connected to the transmission rod via a reducer, and the motor is mounted on the outer end surface of the cyclotron magnet via a bracket.

[0015] According to one embodiment of the present invention, there are four adjustment components and they are arranged at equal intervals along the circumference of the cyclotron magnet.

[0016] According to an embodiment of the present invention, the cyclotron magnet includes an iron yoke and a magnetic pole, and the through hole penetrates the iron yoke and the magnetic pole.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 Schematic diagram of the structure of a cyclotron first harmonic regulation system according to an embodiment of the present invention.

[0020] Figure 2 Schematic diagram of the structure of a cyclotron first harmonic regulation system according to an embodiment of the present invention.

[0021] Figure 3Schematic diagram of the structure of the regulating component of the cyclotron first harmonic regulating system according to an embodiment of the present invention.

[0022] Figure numerals: cyclotron first harmonic regulation system 1, cyclotron magnet 10, through hole 11, iron yoke 12, magnetic pole 13, regulation assembly 20, regulation rod 21, driving device 22, transmission rod 23, flange seat 24, pressure cover 25, reducer 26, bracket 27. DETAILED DESCRIPTION

[0023] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] A cyclotron first harmonic regulation system 1 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0027] like Figure 1-Figure 3 As shown, a cyclotron first harmonic adjustment system 1 according to an embodiment of the present invention includes a cyclotron magnet 10 and a plurality of adjustment components 20 .

[0028] A plurality of through holes 11 are provided on the cyclotron magnet 10. Each adjustment assembly 20 includes an adjustment rod 21 and a driving device 22. The plurality of adjustment rods 21 are axially movable in the plurality of through holes 11, respectively. The plurality of driving devices 22 are provided on the cyclotron magnet 10 and are respectively connected to the plurality of adjustment rods 21 in a transmission manner. The adjustment rods 21 are soft magnetic parts.

[0029] Specifically, the driving device 22 adjusts the magnetic field by controlling the distance between the adjusting rod 21 and the midplane. When the adjusting rod 21 approaches the midplane, the local magnetic field at the position of the adjusting rod 21 increases. On the contrary, when the adjusting rod 21 is away from the midplane, the local magnetic field decreases. By controlling multiple adjusting rods 21, when the distances between the multiple adjusting rods 21 and the midplane are different, an asymmetric magnetic field is generated, thereby generating a corresponding first harmonic of the magnetic field.

[0030] Since the adjusting rod 21 is driven to move by the driving device 22, the first harmonic of the magnetic field of the cyclotron can be adjusted without opening the cavity during the operation of the cyclotron, which can save the process of multiple adjustments and frequent cavity opening, improve the adjustment efficiency, and save adjustment time.

[0031] After being adjusted to the correct position, the driving device 22 can be directly turned off, and the adjusting rod 21 remains at the current position.

[0032] According to the cyclotron first harmonic regulation system 1 of the embodiment of the present invention, an adjustment rod 21 and a driving device 22 are provided. The adjustment rod 21 is a soft magnetic part. The driving device 22 drives the adjustment rod 21 to move to adjust the first harmonic. After the adjustment is in place, the driving device 22 can be powered off to keep the adjustment rod 21 at the current position. Compared with the method of using an energized coil for adjustment in the related art, the cyclotron first harmonic regulation system 1 does not need to be continuously powered by an external power supply after the adjustment is completed, and has better stability.

[0033] Furthermore, by providing an adjustment rod 21 and a driving device 22, the driving device 22 drives the adjustment rod 21 to move to adjust the first harmonic, so that during the operation of the cyclotron, the first harmonic can be adjusted online without opening the cavity. Compared with the method of manually adjusting the position of the soft magnetic rod in the open cavity state in the related art, the frequent cavity opening process can be omitted, the adjustment time can be saved, and the adjustment efficiency can be improved.

[0034] Therefore, the cyclotron first harmonic regulation system 1 according to the embodiment of the present invention has the advantages of strong stability and high regulation efficiency.

[0035] The cyclotron first harmonic regulation system 1 according to a specific embodiment of the present invention will be described below with reference to the accompanying drawings.

[0036] In some specific embodiments of the present invention, Figure 1-Figure 3As shown, a cyclotron first harmonic adjustment system 1 according to an embodiment of the present invention includes a cyclotron magnet 10 and a plurality of adjustment components 20 .

[0037] Specifically, Figure 3 As shown, the driving device 22 is a motor, and the motor is connected to the driving rod 23. One of the driving rod 23 and the adjusting rod 21 is provided with an internal thread and the other is provided with an external thread, and the internal thread and the external thread are meshed. In this way, the driving rod 23 can be driven to rotate by the motor, and the driving rod 23 and the adjusting rod 21 can be meshed with the internal thread and the external thread to convert the rotation into the relative movement of the driving rod 23 and the adjusting rod 21 along the axial direction, so that the driving device 22 drives the adjusting rod 21 to move along the axial direction.

[0038] Specifically, the internal thread and the external thread are trapezoidal threads to improve transmission accuracy and reliability. The distance the adjustment rod moves is precisely controlled by the pitch of the internal thread and the external thread.

[0039] More specifically, the through hole 11 is a waist-shaped hole, and the shape of the radial cross section of at least a portion of the adjusting rod 21 is a waist-shaped shape that matches the shape of the through hole 11 to limit the relative rotation of the through hole 11 and the adjusting rod 21. In this way, the adjusting rod 21 can be prevented from rotating along with the transmission rod 23 when the transmission rod 23 rotates, so that the driving force of the driving device 22 can be reliably converted into the axial movement of the adjusting rod 21, and the adjusting rod 21 can be easily guided and radially positioned, thereby improving the stability and reliability of the adjusting rod 21 during axial movement.

[0040] Optionally, the transmission rod 23 is made of a non-magnetic material, which can prevent the transmission rod 23 from interfering with the adjustment effect of the adjustment rod 21.

[0041] Specifically, the transmission rod 23 can be made of copper material, which not only makes the transmission rod 23 non-magnetic, but also makes the transmission rod 23 have a certain self-lubricating effect, thereby reducing the friction between the adjustment rod 21 and the transmission rod 23, making the rotation between the adjustment rod 21 and the transmission rod 23 smoother.

[0042] Figure 1-Figure 3 A cyclotron first harmonic regulation system 1 according to some examples of the present invention is shown. Figure 3 As shown, the outer end surface of the cyclotron magnet 10 is provided with a plurality of flange seats 24, and the plurality of flange seats 24 are respectively located at the plurality of through holes 11. The transmission rod 23 is rotatably fitted in the flange seat 24, and a pressure cover 25 is provided on the flange seat 24. The outer peripheral surface of the transmission rod 23 is provided with an annular boss, and the annular boss is stopped between the flange seat 24 and the pressure cover 25 in the axial direction. In this way, the transmission rod 23 can be supported and positioned by the flange seat 24 and the pressure cover 25, so as to ensure the position stability of the transmission rod 23.

[0043] Advantageously, a bearing is provided between the transmission rod 23 and the flange seat 24. Specifically, the bearing may be a thrust ball bearing. This can reduce the friction force when the transmission rod 23 rotates relative to the flange seat 24, making the rotation of the transmission rod 23 smoother.

[0044] More advantageously, sealing rings are provided between the flange seat 24 and the cyclotron magnet 10 and between the flange seat 24 and the transmission rod 23. Specifically, a double sealing ring in parallel can be provided between the transmission rod 23 and the flange seat 24. This can reduce the risk of vacuum breaking inside the cyclotron magnet 10 and avoid the adjustment process from destroying the vacuum state of the cyclotron.

[0045] Specifically, Figure 1-Figure 3 As shown, the motor is connected to the transmission rod 23 through a reducer 26. This can reduce the speed of the motor output to the transmission rod 23, increase the torque of the motor output to the transmission rod 23, and improve the stability and reliability of the transmission rod 23 when rotating.

[0046] Furthermore, if Figure 1-Figure 3 As shown, the motor is mounted on the outer end surface of the cyclotron magnet 10 through a bracket 27. This makes it easier to mount the motor on the cyclotron magnet 10 and improves the stability of the motor.

[0047] Alternatively, if Figure 1 and Figure 2 As shown, there are four adjustment components 20 and they are arranged at equal intervals along the circumference of the cyclotron magnet 10. In this way, the four adjustment components 20 can be symmetrical to each other, which is convenient for adjusting the first harmonic.

[0048] More specifically, Figure 1 and Figure 2 As shown, the cyclotron magnet 10 includes an iron yoke 12 and a magnetic pole 13, and the through hole 11 passes through the iron yoke 12 and the magnetic pole 13. This makes it easy for the adjustment rod 21 to reach the mid-plane position of the cyclotron magnet 10, thereby facilitating the adjustment of the first harmonic.

[0049] Specifically, the diameter of the through hole 11 is 20 mm and the depth is greater than or equal to 700 mm. This makes it easier for the adjustment rod 21 to extend into the mid-plane position, making it easier to adjust the first harmonic.

[0050] Other structures and operations of the cyclotron first harmonic regulation system 1 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0051] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0052] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A cyclotron first harmonic regulation system, characterized in that: include: A cyclotron magnet, wherein the cyclotron magnet is provided with a plurality of through holes; Multiple adjustment components, each of which includes an adjustment rod and a driving device. The multiple adjustment rods are respectively axially movably arranged in the multiple through holes. The multiple driving devices are arranged on the cyclotron magnet and are respectively connected to the multiple adjustment rods in a transmission manner. The adjustment rods are soft magnetic parts.

2. The cyclotron first harmonic regulation system according to claim 1, characterized in that: The driving device is a motor, and the motor is connected to a transmission rod. One of the transmission rod and the adjustment rod is provided with an internal thread and the other is provided with an external thread, and the internal thread is meshed with the external thread.

3. The cyclotron first harmonic regulation system according to claim 2, characterized in that: The through hole is a waist-shaped hole, and the shape of the radial cross section of at least a portion of the adjusting rod is a waist-shaped shape adapted to the shape of the through hole to limit the relative rotation of the through hole and the adjusting rod.

4. The cyclotron first harmonic regulation system according to claim 2, characterized in that: The transmission rod is made of non-magnetic material.

5. The cyclotron first harmonic regulation system according to claim 2, characterized in that: The outer end surface of the cyclotron magnet is provided with a plurality of flange seats, and the plurality of flange seats are respectively located at the plurality of through holes. The transmission rod is rotatably engaged in the flange seat, and a pressure cover is provided on the flange seat. The outer peripheral surface of the transmission rod is provided with an annular boss, and the annular boss is stopped between the flange seat and the pressure cover in the axial direction.

6. The cyclotron first harmonic regulation system according to claim 5, characterized in that: A bearing is arranged between the transmission rod and the flange seat.

7. The cyclotron first harmonic regulation system according to claim 5, characterized in that: Sealing rings are provided between the flange seat and the cyclotron magnet and between the flange seat and the transmission rod.

8. The cyclotron first harmonic regulation system according to claim 2, characterized in that: The motor is connected to the transmission rod through a reducer, and the motor is installed on the outer end surface of the cyclotron magnet through a bracket.

9. The cyclotron first harmonic regulation system according to claim 1, characterized in that: There are four adjustment components, which are arranged at equal intervals along the circumference of the cyclotron magnet.

10. The cyclotron first harmonic regulation system according to claim 1, characterized in that: The cyclotron magnet includes an iron yoke and a magnetic pole, and the through hole penetrates the iron yoke and the magnetic pole.

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