Beam distribution system and method of linear accelerator isotope production device

Abstract

The invention provides a beam distribution system and method for a linear accelerator isotope production device, and the system comprises a main path deflection magnet which is disposed on a main path of a beam and is disposed between adjacent acceleration units. The slave path deflection magnets and the isotope production target are sequentially arranged on a leading-out path of a beam current at the downstream of each main path deflection magnet; and the plurality of slave path deflection magnets are located on a slave path on the same straight line, and the slave path deflection magnets can be switched between a closed state and an open state, and are set to enable the beam to deflect from the leading-out path to the slave path in the open state, or enable the beam to deflect from the slave path to the leading-out path and point to the target material. According to the linear accelerator isotope production device, full-energy coverage of all target regions of the linear accelerator isotope production device can be realized, and isotope production can be simultaneously carried out on all target regions under different energy requirements.

Description

Technical Field

[0001] This invention belongs to the field of charged particle accelerators, specifically relating to a beam distribution system and method for a linear accelerator isotope production device, used to distribute charged particles of different energies generated by the linear accelerator to various production target chambers, aiming to solve the beam distribution problem of isotope production devices. Background Technology

[0002] Medical isotopes are a special class of radioactive nuclides used in the medical field for diagnosis, treatment, and research. They exert their effects by releasing specific types of radiation (such as gamma rays, beta particles, and alpha particles).

[0003] Isotope production is typically carried out using reactors or accelerators. Compared to reactors, accelerators offer more controllable beam energy and produce fewer impurities after target application, making them suitable for the production of certain specialized isotopes. Currently, most accelerator-based medical isotope production solutions utilize cyclotron accelerators. Cyclotron accelerators are small, have fixed energy, and low beam intensity, making them suitable for installation in hospitals. Linear accelerators, compared to cyclotron accelerators, offer higher average beam intensity, adjustable energy, easier upgrades and maintenance, and the ability to accelerate different types of particles, making them suitable for integrated isotope production plants.

[0004] Currently, dedicated isotope production equipment based on linear accelerators is still under development. Its beam distribution system is responsible for extracting, transmitting, and distributing beams generated at different energy levels of the linear accelerator to the production target area, meeting the beam parameter requirements of the target area. Existing equipment typically places the production target area at the end of the linear accelerator, requiring beams of different energies to pass through the entire accelerator before distribution. This approach requires a large footprint and is not compact. Alternatively, beams of different energies can be extracted from different locations within the linear accelerator and then directly connected to the production target. However, in this distribution scheme, each production target can only receive a single energy beam, which is not flexible enough. Summary of the Invention

[0005] The purpose of this invention is to provide a beam distribution system for a linear accelerator isotope production device, which is compact in layout, flexible in distribution, and enables simultaneous full-energy beam supply to the entire target area.

[0006] To achieve the above objectives, the present invention provides a beam distribution system for a linear accelerator isotope production apparatus. This system is used in a linear accelerator with multiple acceleration units, including a main path deflector magnet disposed on the main beam path and between adjacent acceleration units and downstream of the last acceleration unit, and a secondary path deflector magnet and an isotope production target sequentially arranged on the beam exit path downstream of each main path deflector magnet. Multiple secondary path deflectors are located on the same straight secondary path, and the secondary path deflectors are switchable between a closed state and an open state. In the open state, the magnets deflect the beam from the exit path to the secondary path, or deflect the beam from the secondary path to the exit path and point it towards the target.

[0007] Preferably, the main path deflection magnet is switchable between an on and off state, and is configured to deflect the beam to the beam exit path when in the on state, so that each main path deflection magnet serves as a beam exit position when in the on state.

[0008] Preferably, the follow paths of the beam are all parallel to the main path, and the lead paths of the beam are all perpendicular to the main path of the beam.

[0009] Preferably, both the main path deflection magnet and the secondary path deflection magnet are multi-angle dipole magnets.

[0010] Preferably, the number of beam extraction paths corresponding to each main path deflection magnet is 2; the slave paths include a first slave path and a second slave path, which are located on both sides of the main path respectively; or, the number of slave path deflection magnets corresponding to each main path deflection magnet is 1, and the number of slave paths is 1 and located on the same side of the main path.

[0011] Preferably, a first matching segment is provided on the beam extraction path between each main path deflecting magnet and the secondary path deflecting magnet.

[0012] Preferably, the linear accelerator with multiple acceleration units includes an ion source system located on the main path of the beam, a radio frequency quadrupole accelerator, and multiple acceleration units.

[0013] Preferably, the ion source system includes multiple ion sources, and the ions generated by the multiple ion sources include at least two of protons, deuterium ions and helium ions.

[0014] Preferably, the rated energy gain value provided by different acceleration units to the beam is designed and determined according to the energy requirements of isotope preparation, so that each ion has more than 6 rated energy points in the range of 8-30MeV when the beam energy is extracted; each ion has a rated energy point at each beam extraction position corresponding to the combination of the switching states of all the acceleration units upstream, so that the ion is output at the rated energy point at each beam extraction position.

[0015] On the other hand, the present invention provides a beam distribution method for a linear accelerator isotope production apparatus, comprising:

[0016] S0: Construct the beam distribution system for the linear accelerator isotope production device described above;

[0017] S1: Before the pulse emission of each beam, determine the rated energy point of the beam to be targeted and the isotope production target.

[0018] S2: Based on the rated energy point of the beam, the corresponding main path deflection magnet is determined as the beam extraction device, and the corresponding secondary path deflection magnet is determined as the first beam deflection device; based on the isotope production target, the corresponding secondary path deflection magnet is determined as the second beam deflection device.

[0019] S3: At the moment of beam pulse emission, the beam extraction device, the first beam deflection device, the second beam deflection device, and all the acceleration units upstream of the beam extraction device are turned on, so that the beam reaches the rated energy point through the switching state combination of the acceleration units upstream of the main path deflection magnet. The beam is deflected onto the extraction path by the beam extraction device and transmitted to the first beam deflection device, deflected onto the secondary path by the first beam deflection device and transmitted to the second beam deflection device, and deflected onto the extraction path by the second beam deflection device and transmitted to the isotope production target.

[0020] This invention enables full energy coverage of the entire target area in a linear accelerator isotope production device, and all target areas can simultaneously produce isotopes under different energy requirements. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the beam distribution system of the linear accelerator isotope production apparatus of the present invention. Detailed Implementation

[0022] Preferred embodiments of the present invention are given below with reference to the accompanying drawings and described in detail. It should be understood that the following embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0023] The beam distribution system of the linear accelerator isotope production apparatus of the present invention is used in a linear accelerator having multiple acceleration units, comprising a main path deflecting magnet 10 disposed on the main path of the beam and between adjacent acceleration units 130, and a secondary path deflecting magnet 20 and an isotope production target 30 arranged sequentially on the beam exit path downstream of each main path deflecting magnet 10.

[0024] The main path deflection magnet 10 is switchable between an on and off state. When it is on, it is configured to deflect the beam to the beam extraction path, so that each main path deflection magnet 10 serves as a beam extraction position when it is on, thereby enabling the extraction of beams of different energies.

[0025] Multiple path deflection magnets 20 are located on the same straight path, and the path deflection magnets 20 are switchable between an off state and an on state. When on, they are configured to deflect the beam from the lead-in path to the path, or deflect the beam from the path to the lead-in path and point it towards the target. Each path deflection magnet 20 corresponds one-to-one with an isotope production target 30, which is configured to receive beams from its corresponding path deflection magnet 20 to achieve isotope production.

[0026] Both the main path deflecting magnet 10 and the secondary path deflecting magnet 20 are multi-angle diode magnets. The direction of the current inside the multi-angle diode magnet is variable, switching between forward and reverse directions as needed to deflect the current beam.

[0027] In this embodiment, each main path deflecting magnet 10 corresponds to two beam extraction paths, which are opposite to each other; correspondingly, each main path deflecting magnet 10 corresponds to two slave path deflecting magnets 20, and each slave path deflecting magnet 20 corresponds to one isotope production target 30; the slave path includes a first slave path and a second slave path, which are located on both sides of the main path.

[0028] In this embodiment, there are 5 main path deflecting magnets 10, and correspondingly, 10 secondary path deflecting magnets 20 and 10 isotope production targets 30. Thus, the main path deflecting magnets 10 guide the beam to both sides at each energy extraction position, outputting it to the 10 isotope production targets 30 on both sides. A secondary path beam transmission line is provided on the line connecting the isotope production targets 30 on both sides and the main path deflecting magnets 10, and a secondary path deflecting magnet 20 is provided at the intersection of the secondary path and the connecting line to achieve beam deflection pointing towards or onto the secondary path. In other embodiments, the value of the main path deflecting magnet 10 can be greater than 1.

[0029] In other embodiments, each main path deflecting magnet 10 corresponds to one secondary path deflecting magnet 20, and each secondary path deflecting magnet 20 corresponds to one isotope production target 30. Accordingly, there is one secondary path and it is located on the same side of the main path.

[0030] In this embodiment, the follow paths of the beam are all parallel to the main path, and the lead-out paths of the beam are all perpendicular to the main path of the beam.

[0031] In this embodiment, a first matching segment 21 is provided on the beam extraction path between each main path deflection magnet 10 and the secondary path deflection magnet 20, so that the beam parameters output from the upstream are within the acceptable range of the downstream structure. The first matching segment 21 preferably uses three quadrupole magnets.

[0032] The linear accelerator 100, which has multiple acceleration units, includes an ion source system 110, a radio frequency quadruple accelerator (RFQ) 120, and multiple acceleration units 130 located on the main beam path. Because it is a linear accelerator, the main beam path is a straight line.

[0033] The ion source system 110 is used to generate an ion beam and includes multiple ion sources. In this embodiment, the ion source system 110 includes multiple ion sources 111 arranged sequentially along the propagation direction of the ion beam, ion source deflection magnets 112, and a low-energy transmission section.

[0034] Multiple ion sources 111 are used to generate different ions, enabling rapid switching between different ion types without shutting down the accelerator. The ions generated by the multiple ion sources 111 include, but are not limited to, protons, deuterium ions, and helium ions.

[0035] The ion source 111 is preferably an electron cyclotron resonance (ECR) type. By introducing different types of gases (such as H2, D2, He, etc.) into the ion source 111 and feeding microwave power, the gases will ionize in the discharge chamber to form plasma, which will then generate corresponding ions (such as...). D + He 2+ (etc.) Ion sources are used to extract ions using high voltage, thereby providing a sufficiently strong ion beam for the accelerator. In this embodiment, there are two ion sources 111. Ion sources can generate different ions by changing the type of gas introduced, so one ion source can generate many types of ions. However, considering factors such as the time required to switch gases, the complexity of the mechanical structure required for rapid gas switching, and the preheating time required for the ion source to reach a stable operating state, it is difficult for a single ion source to achieve rapid switching of multiple ion types without shutting down the accelerator.

[0036] The low-energy transport section is a single unit, which may include a quadrupole magnet 1131 and a solenoid 1132. The quadrupole magnet and solenoid are used to focus the beam so that the beam can be injected into the radio frequency quadrupole accelerator 120 with parameters that meet the inlet acceptability requirements of the radio frequency quadrupole accelerator 120. The ion source deflection magnet 112 is used to transport ions generated by multiple ion sources 111 into the same low-energy transport section.

[0037] The radio frequency quadrupole accelerator 120 includes a radial matching section, a shaping section, a focusing section, and an accelerating section. Thus, the beam exits the ion source system 110 as a continuous beam, first entering the radial matching section of the RFQ, where the accelerator aperture rapidly narrows, modulating the lateral shape of the beam to enter the acceptability range. In the shaping section, the modulation of the electrode tip gradually increases from 0, and the continuous beam begins to gradually converge into a cluster. In the focusing section, the modulation of the electrode tip further increases to its maximum value, and the beam is further focused, with its lateral and longitudinal phase space distributions exhibiting periodic oscillations. Finally, the beam enters the accelerating section, where the electrode tip maintains essentially maximum modulation, primarily for beam acceleration. The beam is accelerated to above 3 MeV / µs by the RFQ.

[0038] The radio frequency quadrupole accelerator 120 is preferably a four-wing type radio frequency quadrupole accelerator. The radio frequency quadrupole accelerator is an acceleration structure invented to address the characteristics of proton beams at low energies. It primarily utilizes four electrodes to generate a strong focusing effect, solving the problem of proton beam emittance growth at low energies. Simultaneously, modulation is added to the electrode heads to produce an acceleration effect. Compared to other types of radio frequency quadrupole accelerators, the four-wing type has stronger heat dissipation capabilities, which can improve the duty cycle during operation. In this invention, the radio frequency quadrupole accelerator can operate at 100% duty cycle. The radio frequency quadrupole accelerator can accelerate ions to a certain energy.

[0039] In this embodiment, the acceleration unit 130 employs a drift tube linear accelerator to further accelerate ions. Preferably, the acceleration unit 130 employs an interdigital H-mode drift tube linear accelerator (IH-DTL).

[0040] Different acceleration units 130 have different rated energy gain values, resulting in different energy gain values ​​for the same ion from different acceleration units 130. In this embodiment, the rated energy gain values ​​provided by different acceleration units 130 to the beam are designed and determined according to the energy requirements of isotope preparation, so that the beam energy at the extraction point of each ion has more than six rated energy points in the range of 8-30 MeV, thereby ensuring that the beam energy at different beam extraction positions meets the energy requirements for different types of isotope preparation. The energy requirements for isotope preparation can be, for example, the beam energy value required for the preparation of medical isotopes.

[0041] Each type of ion has a rated energy point at each beam extraction position corresponding to the combination of on / off states of all upstream acceleration units 130, so that the ion is output at the rated energy point at each beam extraction position. That is, after the rated energy gain values ​​of different acceleration units 130 are determined, when the highest energy of the linear accelerator of this invention is required, all acceleration units 130 operate simultaneously; when the rated energy point of other targets is required, one or more acceleration units 130 can be sequentially shut off starting downstream, accelerating the beam only to the target rated energy point, or the upstream deflection magnet can be used directly to extract the beam, so that the energy of the beam extracted at that beam extraction position is the target rated energy point, thereby meeting the needs of various isotope production. Therefore, the multi-energy ion linear accelerator of this invention, through the switching of multiple acceleration units 130 and beam extraction at multiple beam extraction positions, can greatly improve the production efficiency and variety of isotopes, reduce the difficulty of isotope separation and purification, and improve isotope purity.

[0042] Furthermore, a beamsettler 141 and a second matching section 142 are provided between the radio frequency quadrupole accelerator 120 and the acceleration unit 130. The beamsettler 141 is used to achieve longitudinal matching of the beam from the radio frequency quadrupole accelerator 120 to the acceleration unit 130. The phase space distribution of the beam at the exit of the radio frequency quadrupole accelerator 120 is opposite in the horizontal and vertical directions, which cannot meet the injection requirements of the acceleration unit 130. Therefore, the second matching section 142 is used to match the beam parameters between the upstream and downstream acceleration structures, ensuring that the beam parameters output from the upstream are within the acceptable range of the downstream structure. The second matching section 142 preferably uses three quadrupole magnets. After passing through the matching section composed of three quadrupole magnets, the phase space distribution of the beam becomes consistent, and the motion trend is focused, thus meeting the injection requirements of the acceleration unit 130.

[0043] A beam measuring device (not shown), a third matching section 153, and the main path deflection magnet 10 are sequentially installed between two adjacent segments of the acceleration unit 130. The beam measuring device (not shown), the third matching section 153, and the main path deflection magnet 10 are also installed downstream of the last acceleration unit 30. Each acceleration unit segment, its corresponding third matching section 153, and the main path deflection magnet 10 are shown within the dashed box in the figure. The beam measuring device is used to monitor changes in beam parameters. The third matching section 153 not only enables beam parameter matching between different upstream and downstream acceleration structures, ensuring that the beam parameters output from the upstream are within the acceptable range of the downstream structure, but also guarantees lossless beam transmission when some acceleration units 130 are shut down. The third matching section 153 preferably uses three quadrupole magnets. In other embodiments, the beam measuring device and the third matching section 153 can be replaced or omitted.

[0044] Both the radio frequency quadrupole accelerator 120 and the acceleration unit 130 use klystrons as power sources, and power is fed into the acceleration cavities of the radio frequency quadrupole accelerator 120 and the acceleration unit 130 through magnetic couplers. Thus, RF power is generated from the power source, transmitted to the coupler through a coaxial cable, and then used to excite the electromagnetic field in the acceleration cavity through the ring probe of the magnetic coupler.

[0045] The present invention also provides a beam distribution method for a linear accelerator isotope production apparatus, which specifically includes the following steps:

[0046] Step S0: Construct the beam distribution system for the linear accelerator isotope production device described above;

[0047] Step S1: Before the pulse emission of each beam, determine the rated energy point of the beam as the target and the isotope production target 30;

[0048] The beam distribution scheme includes two dimensions: a spatial dimension, namely the beam transmission path, which is determined by the isotope production target 30; and a temporal dimension, namely the beam energy generated by each pulse and the corresponding beam extraction position when the linear accelerator pulses are working.

[0049] Step S2: Based on the rated energy point of the beam, the corresponding main path deflection magnet 10 is determined as the beam extraction device, and the corresponding secondary path deflection magnet 20 is determined as the first beam deflection device; based on the isotope production target 30, the corresponding secondary path deflection magnet 20 is determined as the second beam deflection device.

[0050] Step S3: At the moment of beam pulse emission, turn on the beam extraction device, the first beam deflection device, the second beam deflection device, and all the acceleration units upstream of the beam extraction device, so that the beam reaches the rated energy point through the switching state combination of the acceleration unit 130 upstream of the main path deflection magnet 10, is deflected to the extraction path by the beam extraction device and transmitted to the first beam deflection device, is deflected to the secondary path by the first beam deflection device and transmitted to the second beam deflection device, and is deflected to the extraction path by the second beam deflection device and transmitted to the isotope production target 30.

[0051] Thus, a beam from any energy extraction point can be redirected along its path to enter any target region.

[0052] Therefore, when the accelerator is working, the linear accelerator can achieve rapid energy adjustment by controlling the power switch and amplitude phase of the accelerator cavity. Subsequently, by utilizing the layout of the beam distribution system and the beam distribution method of the linear accelerator isotope production device described above, the beams of different energies under each pulse can be transmitted to the designated target area. Since the linear accelerator can achieve extremely short pulse lengths (such as a few milliseconds), it can cover the beam distribution of all target areas in a very short time. Therefore, for working conditions that require long-term target firing, it is equivalent to the simultaneous production of all isotope production targets 30, realizing the simultaneous distribution of full energy of all isotope production targets 30.

[0053] The following experimental example illustrates the working principle of the beam distribution system of the linear accelerator isotope production device of the present invention.

[0054] like Figure 1 As shown, the isotope production targets 30 are labeled as the first isotope production target B1 to the tenth isotope production target B10, the main path deflection magnets 10 are labeled as the first main path deflection magnet Z1 to the fifth main path deflection magnet Z5, and the secondary path deflection magnets 20 are labeled as the first secondary path deflection magnet C1 to the tenth secondary path deflection magnet C10. Since the structure is periodic, the third, fourth, eighth, and ninth isotope production targets, the third and fourth main path deflection magnets, and the third, fourth, eighth, and ninth secondary path deflection magnets are omitted and represented only by ellipses. In this embodiment, during operation, all acceleration units upstream of the main path deflection magnets 10 are activated, so that the beam energies output by the first main path deflection magnets Z1 to the fifth main path deflection magnets Z5, when used as beam extraction positions, are the first to fifth energy points, respectively.

[0055] An example is described using the following beam distribution requirements: the first to third isotope production targets B1 use the beam at energy point 1; the fourth to fifth isotope production targets B5 use the beam at energy point 2; the sixth isotope production target B6 uses the beam at energy point 3; the seventh to eighth isotope production targets B7 use the beam at energy point 4; and the ninth to tenth isotope production targets B10 use the beam at energy point 5. All isotope production targets 30 perform isotope production simultaneously.

[0056] The specific work process is as follows:

[0057] The repetition frequency of the linear accelerator is set at 10 Hz, which means there are 10 pulses per second, generating 10 macropulse beams with adjustable energy.

[0058] The first pulse accelerates the beam to the energy required for the first isotope production target B1. From the first energy point, it is deflected by the first main path deflector magnet Z1 to the direction of the first secondary path deflector magnet C1, and directly enters the first isotope production target B1.

[0059] The second pulse accelerates the beam to the energy required for the second isotope production target B2. From the first energy point, it is deflected by the first main path deflector magnet Z1 to the direction of the first secondary path deflector magnet C1, then by the first secondary path deflector magnet C1 to the direction of the second secondary path deflector magnet C2, and finally by the second secondary path deflector magnet C2 into the second isotope production target B2.

[0060] The third pulse accelerates the beam to the energy required for the third isotope production target. From the first energy point, it is deflected by the first main path deflector magnet Z1 to the direction of the first secondary path deflector magnet C1, then by the first secondary path deflector magnet C1 to the direction of the third secondary path deflector magnet, and finally by the third secondary path deflector magnet into the third isotope production target.

[0061] The fourth pulse accelerates the beam to the energy required for the fourth isotope production target. From the second energy point, it is deflected by the second main path deflector magnet Z2 to the direction of the second secondary path deflector magnet C2, then by the second secondary path deflector magnet C2 to the direction of the fourth secondary path deflector magnet, and finally deflected by the fourth secondary path deflector magnet into the fourth isotope production target.

[0062] The fifth pulse accelerates the beam to the energy required for the fifth isotope production target B5. From the second energy point, it is deflected by the second main path deflector magnet Z2 to the direction of the second secondary path deflector magnet C2, then by the second secondary path deflector magnet C2 to the direction of the fifth secondary path deflector magnet C5, and finally by the fifth secondary path deflector magnet C5 into the fifth isotope production target B5.

[0063] The sixth pulse accelerates the beam to the energy required for the sixth isotope production target B6. From the third energy point, it is deflected by the third main path deflector magnet to the direction of the eighth secondary path deflector magnet, then by the eighth secondary path deflector magnet to the direction of the sixth secondary path deflector magnet C6, and finally by the sixth secondary path deflector magnet C6 into the sixth isotope production target B6.

[0064] The 7th pulse accelerates the beam to the energy required for the 7th isotope production target B7. From the 4th energy point, it is deflected by the 4th main path deflector magnet to the 9th secondary path deflector magnet, then by the 9th secondary path deflector magnet to the 7th secondary path deflector magnet C7, and finally by the 7th secondary path deflector magnet C7 into the 7th isotope production target B7.

[0065] The 8th pulse accelerates the beam to the energy required for the 8th isotope production target. From the 4th energy point, it is deflected by the 4th main path deflector magnet to the 9th secondary path deflector magnet, then by the 9th secondary path deflector magnet to the 8th secondary path deflector magnet, and finally by the 8th secondary path deflector magnet into the 8th isotope production target.

[0066] The 9th pulse accelerates the beam to the energy required for the 9th isotope production target. From the 5th energy point, it is deflected by the 5th main path deflector magnet Z5 to the 10th secondary path deflector magnet C10, then by the 10th secondary path deflector magnet C10 to the 9th secondary path deflector magnet, and finally by the 9th secondary path deflector magnet into the 9th isotope production target.

[0067] The 10th pulse accelerates the beam to the energy required for the 10th isotope production target B10. It is deflected from the 5th energy point to the direction of the 10th secondary path deflection magnet C10 via the 5th main path deflection magnet Z5, and then directly enters the 10th isotope production target B10.

[0068] The above process operates cyclically, thus achieving full energy distribution for all isotope production targets and simultaneous isotope production.

[0069] In summary, this invention, through the innovative layout design of the main path deflecting magnet and the secondary path deflecting magnet, can transmit beams with different rated energy points from different beam extraction positions to any target area; and through the beam distribution control method, utilizing the beam path under the layout of the main path deflecting magnet and the secondary path deflecting magnet, it can be realized that any target chamber can receive beams with all rated energy points.

[0070] Furthermore, this invention symmetrically distributes isotope production targets on both sides of the linear accelerator, reducing the device's footprint; and uses main path deflection magnets and secondary path deflection magnets to construct the beam transmission line, adding a secondary path in front of the target areas on both sides, allowing the beam to enter the target chamber from both directions, achieving multi-energy distribution. In addition, the method of this invention also enables simultaneous production in all target areas by performing corresponding beam distribution control during the pulse operation of each beam in the accelerator.

[0071] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the invention. Various variations can be made to the above embodiments of the present invention. All simple and equivalent changes and modifications made in accordance with the claims and description of this application fall within the protection scope of the claims of this patent. All aspects not described in detail in this invention are conventional technical content.

Claims

1. A beam distribution system for a linear accelerator isotope production apparatus, used in a linear accelerator having multiple acceleration units, characterized in that, It includes a main path deflector magnet located on the main path of the beam and between adjacent acceleration units and downstream of the last acceleration unit, as well as a secondary path deflector magnet and an isotope production target arranged sequentially on the beam extraction path downstream of each main path deflector magnet. Multiple path deflection magnets are located on the same straight path, and the path deflection magnets are switchable between a closed state and an open state. When the open state is set, the beam is deflected from the lead-out path to the path, or the beam is deflected from the path to the lead-out path and pointed at the target.

2. The beam distribution system of the linear accelerator isotope production apparatus according to claim 1, characterized in that, The main path deflection magnet is switchable between an on and off state. When the magnet is on, it is configured to deflect the beam to the beam exit path, so that each main path deflection magnet serves as a beam exit position when the magnet is on.

3. The beam distribution system of the linear accelerator isotope production apparatus according to claim 1, characterized in that, The beam's trailing paths are all parallel to the main path, and the beam's trailing paths are all perpendicular to the main path.

4. The beam distribution system of the linear accelerator isotope production apparatus according to claim 1, characterized in that, Both the main path deflection magnet and the secondary path deflection magnet are multi-angle dipole magnets.

5. The beam distribution system of the linear accelerator isotope production apparatus according to claim 1, characterized in that, The number of beam extraction paths corresponding to each main path deflection magnet is 2; the slave paths include a first slave path and a second slave path, which are located on both sides of the main path, respectively. Alternatively, each main path deflection magnet corresponds to one secondary path deflection magnet, and the secondary path has one magnet located on the same side of the main path.

6. The beam distribution system of the linear accelerator isotope production apparatus according to claim 1, characterized in that, A first matching segment is provided on the beam extraction path between each main path deflector magnet and the secondary path deflector magnet.

7. The beam distribution system of the linear accelerator isotope production apparatus according to claim 1, characterized in that, A linear accelerator with multiple acceleration units includes an ion source system located on the main beam path, a radio frequency quadrupole accelerator, and multiple acceleration units.

8. The beam distribution system of the linear accelerator isotope production apparatus according to claim 7, characterized in that, The ion source system includes multiple ion sources, and the ions produced by the multiple ion sources include at least two of the following: protons, deuterium ions, and helium ions.

9. The beam distribution system of the linear accelerator isotope production apparatus according to claim 8, characterized in that, The rated energy gain value provided by different acceleration units to the beam is designed and determined according to the energy requirements of isotope preparation, so that each ion has more than 6 rated energy points in the range of 8-30MeV when the beam energy is extracted. Each ion has a rated energy point at each beam extraction location corresponding to the combination of switching states of all the acceleration units upstream of it, such that the ion is output at the rated energy point at each beam extraction location.

10. A beam distribution method for a linear accelerator isotope production apparatus, characterized in that, include: Step S0: Construct the beam distribution system of the linear accelerator isotope production apparatus as described in any one of claims 1-9; Step S1: Before the pulse emission of each beam, determine the rated energy point of the beam to be targeted and the isotope production target; Step S2: Based on the rated energy point of the beam, determine the corresponding main path deflection magnet as the beam extraction device, and determine the corresponding secondary path deflection magnet as the first beam deflection device; based on the isotope production target, determine the corresponding secondary path deflection magnet as the second beam deflection device. Step S3: At the moment of beam pulse emission, turn on the beam extraction device, the first beam deflection device, the second beam deflection device, and all the acceleration units upstream of the beam extraction device, so that the beam reaches the rated energy point through the switching state combination of the acceleration units upstream of the main path deflection magnet, is deflected to the extraction path by the beam extraction device and transmitted to the first beam deflection device, is deflected to the secondary path by the first beam deflection device and transmitted to the second beam deflection device, and is deflected to the extraction path by the second beam deflection device and transmitted to the isotope production target.

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