Isotope production device based on multi-particle linear accelerator

Abstract

The invention provides an isotope production device based on a multi-particle linear accelerator. The isotope production device comprises an ion source system located on a main path of a linear beam, a radio frequency quadrupole accelerator, a multi-section linear acceleration unit and a power source system. The power source system is connected with a power divider with a plurality of output branches, and each output branch of the power divider is provided with a radio frequency delay device and a feed-in end of a linear acceleration unit; deflection magnets are installed between every two adjacent sections of the linear acceleration unit and on the downstream of the last section, and the deflection magnets are used for enabling the beam current to deflect to a sub-path of the beam current in an open state. An isotope production target is arranged on a sub-path of the beam at the downstream of each deflection magnet, and detachable target bodies of the isotope production targets are regularly transmitted to the separation and extraction device. The device disclosed by the invention solves the problems that the purity is low, the yield is relatively low, and multiple isotopes cannot be produced on a large scale at the same time.

Description

Technical Field

[0001] This invention belongs to the field of nuclear science and technology, specifically relating to an isotope production device based on a multi-particle linear accelerator, which is suitable for isotope production. Background Technology

[0002] Currently, isotope production and isotope separation and purification are two relatively independent processes. Taking reactor isotope production as an example, after irradiation within the reactor, the target material is transported to other locations for isotope separation and extraction. These two independent processes prevent the isotope production process from forming an effective feedback loop, leading to difficulties in separation and purification and limiting the purity of the isotopes.

[0003] Isotope production primarily occurs through nuclear reactions between radioactive materials and target materials, resulting in the formation of isotopes within the target material. Currently, radioactive materials include neutrons, as well as charged particles such as protons, helium particles, and electrons. There are two main methods of isotope production: reactor production and instrument production. Reactors use neutrons generated in a reactor to interact with the target material, while accelerators use charged particles generated in an accelerator to interact with the target material.

[0004] Reactor production offers technological advantages such as low cost and high yield. However, due to the enormous upfront investment in reactors and the stringent requirements for construction conditions, its commercial application is severely limited. Furthermore, technically, reactor-produced reactors have high levels of isotopic impurities, making separation and purification difficult.

[0005] Compared to reactor-based production, instrument-based production offers technological advantages such as lower equipment costs and easier construction conditions, leading to its increasing application in isotope production. Currently, proton cyclotron accelerators are the primary accelerators used for isotope production. In recent years, methods using 40 to 50 MeV electron accelerators to produce isotopes have also been increasingly proposed.

[0006] Proton cyclotron accelerators typically have beam intensities in the hundreds of microamperes, and energy changes are difficult. Currently, proton cyclotron accelerators used for isotope production have low yields and can produce a limited variety of isotopes due to their low beam intensities and difficulty in energy changes.

[0007] The process of producing isotopes in electron accelerators generally involves an initial electron beam strike to a target, generating X-rays, which then bombard the target material to produce isotopes. In this process, only about 10% of the power from the initial strike is converted into X-ray power, resulting in low electron beam efficiency and low isotope yield. Therefore, current electron accelerators used for isotope production require very high beam intensities to ensure a certain isotope yield.

[0008] For the reasons mentioned above, the production of isotopes in the instrument industry currently faces technical challenges such as low purity, low yield, and the inability to produce multiple isotopes on a large scale simultaneously. Summary of the Invention

[0009] The purpose of this invention is to provide an isotope production device based on a multi-particle linear accelerator, so as to solve the problems of low purity, low yield, and the inability to produce multiple isotopes on a large scale at the same time.

[0010] To achieve the above objectives, the present invention provides an isotope production apparatus based on a multi-particle linear accelerator, comprising an ion source system located on the main path of a linear beam, a radio frequency quadrupole accelerator and multiple linear acceleration units, and a power source system.

[0011] The power source system is connected to a power divider with multiple output branches, and each output branch of the power divider is provided with an RF delay device and a feed end of a section of a linear acceleration unit.

[0012] Deflection magnets are installed between adjacent segments of the linear acceleration unit and downstream of the last linear acceleration unit. The deflection magnets are switchable between on and off states and are used to deflect the beam to a sub-path of the beam when on. An isotope production target is provided on the sub-path of the beam downstream of each deflection magnet, and the detachable target body of the isotope production target is periodically transferred to the separation and extraction device.

[0013] The ion source system includes an ion source; the ion source includes an ionization chamber with a resonant cavity, a gas cylinder connected to the ionization chamber, multiple microwave power sources connected to the ionization chamber through multiple coupling holes, and multiple lead-out electrodes located at the outlet of the ionization chamber; the multiple microwave power sources are used to feed microwave power of different frequencies.

[0014] The number of leads is three, and the distance between them is adjustable.

[0015] Each microwave power source is equipped with an automatic frequency tracking system, which ensures that the frequency of the microwave power source is always consistent with the current resonant frequency of the ionization chamber by real-time tracking and feedback of the resonant frequency of the resonant cavity.

[0016] The ion source also includes a spiral tube magnet fitted into the ionization chamber.

[0017] The ion source system also includes an ion source matching section downstream of the ion source.

[0018] The power source system includes two radio frequency (RF) power sources, a first power combiner connected to the two RF power sources via its input terminal, a spiral delay line and a straight-through line respectively connected to the two output terminals of the first power combiner, and a second power combiner connected to the spiral delay line and the straight-through line via its input terminal. The first power combiner uses its chopping function to divide the input RF into two RF signals with different timing sequences and outputs them from different output ports. The signal output first passes through the spiral delay line and the signal output later passes through the straight-through line to reach the second power combiner simultaneously, thereby merging them into a single signal.

[0019] An eight-stage field resonator is provided on the sub-path of the beam between each deflecting magnet and the isotope production target. The eight-stage field resonator is used to transform the circular beam into a square beam.

[0020] A beam gatherer and a first matching section are provided between the radio frequency quadrupole accelerator and the linear acceleration unit; a beam measuring device, the deflecting magnet, and a second matching section are sequentially installed between two adjacent sections of the linear acceleration unit; a third matching section is also provided on the sub-path of the beam between each deflecting magnet and the isotope production target.

[0021] The sub-paths of the beam are perpendicular to the main path of the beam, and each deflecting magnet corresponds to two sub-paths of the beam, which are opposite to each other.

[0022] The isotope production device based on a multi-particle linear accelerator of the present invention effectively combines the three main steps of accelerator particle generation, particle bombardment of target material to generate isotopes, and isotope separation and purification. In the isotope production process, each link is parameterized and effectively coordinated, thereby solving the technical problems currently faced in the production of instrument-generated isotopes, such as low purity, low yield, and the inability to produce multiple isotopes on a large scale at the same time. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall layout of an isotope production apparatus based on a multi-particle linear accelerator according to an embodiment of the present invention.

[0024] Figure 2 Is it like this? Figure 1 The diagram shows the structure of the ECR ion source in the isotope production device based on a multi-particle linear accelerator.

[0025] Figure 3 Is it like this? Figure 1 The diagram shows the structure of the power source system of the isotope production device based on a multi-particle linear accelerator. Detailed Implementation

[0026] The present invention will be further described below with reference to specific embodiments. It should be understood that the following embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0027] like Figure 1 The diagram illustrates an isotope production apparatus based on a multi-particle linear accelerator according to an embodiment of the present invention. It includes an ion source system 10, a radio frequency quadruple accelerator (RFQ) 20, and multiple linear acceleration units 30 located along the main path of a linear beam, as well as a power source system 40. The power source system 40 is connected to a power divider with multiple output branches, and each output branch of the power divider is equipped with a radio frequency delay device and a feed terminal for one of the linear acceleration units 30. The radio frequency delay device employs a delay line to achieve delay by increasing the transmission length of the radio frequency. Thus, the power source system 40 outputs the required power to different linear acceleration units 30 through the power divider and the radio frequency delay device, allowing multiple linear acceleration units 30 to share the same power source system 40, which is beneficial for timing control and effectively reduces the cost of the apparatus.

[0028] The ion source system 10 is used to generate an ion beam and includes an ion source 11 and a downstream ion source matching section, which includes a quadrupole magnet 12 and a solenoid 13.

[0029] Ion source 11 uses an ECR ion source. For example... Figure 2 As shown, the ion source 11 differs from a conventional ECR ion source. The ion source 11 includes an ionization chamber 111 with a resonant cavity, a gas cylinder 112 connected to the ionization chamber 111, and multiple microwave power sources (i.e., a first power source 113, a second power source 114, and a third power source 115) connected to the ionization chamber 111 through multiple coupling holes. Different frequencies of microwave power are fed into the multiple microwave power sources to ionize the gas within the ionization chamber 111, forming plasma and achieving efficient generation of different ions, thus obtaining high-current ions of different frequencies. Therefore, the ion source 11 realizes a multi-frequency ECR ion source. Furthermore, the ion source 11 also includes a helical magnet 116 sleeved on the ionization chamber 111 and multiple leads 117 located at the outlet of the ionization chamber 111. The helical magnet 116 is used to constrain the movement range of the ions, and the leads 117 are used to extract the ion beam.

[0030] Each microwave power source is equipped with an automatic frequency tracking system, which ensures that the frequency of the microwave power source remains consistent with the current resonant frequency of the resonant cavity in the ionization chamber 111 by real-time tracking and feedback of the resonant frequency of the resonant cavity (the frequency of the resonant cavity varies at different stages, such as different resonant modes and different plasma densities). The automatic frequency tracking system achieves efficient radio frequency coupling, which greatly reduces the difficulty of arc initiation in the ion source 11, and can effectively increase the extraction current intensity and improve the operating stability of the ion source 11.

[0031] The automatic frequency tracking system is configured to perform the following steps: pre-scan the microwave frequency to measure the output current intensity of the ion source at different microwave frequencies (i.e., the current intensity at the outlet of the ion chamber's extraction electrode), obtain the microwave frequency-output current intensity curve, and select the optimal microwave frequency as the initial microwave frequency; after selecting the microwave frequency, continue to acquire the output current intensity of the ion source, and fine-tune the microwave frequency according to the microwave frequency-output current intensity curve to maintain the stability of the output current intensity.

[0032] In other words, the frequency tracking system obtains the output current intensity of the ion source from the ion source and outputs the adjustment amount of microwave power to the power source, so that the ion source can adjust the frequency of the input microwave accordingly.

[0033] Since the power source is a narrowband device, once the operating frequency is selected, the adjustment range is generally within ±10MHz. Therefore, multiple power sources are needed to provide different microwave frequencies.

[0034] In this embodiment, there are three extractors 117 (i.e., D1, D2 and D3) and the distance between them is adjustable, so that high-quality beams can be generated by different combinations of extractor positions for different types of ions.

[0035] In summary, this invention employs improvements such as multiple power sources, frequency tracking, and adjustable lead-out electrode distance to meet the technical requirements of a multi-particle ion source.

[0036] A beam mixer 51 and a first matching section 52 are provided between the radio frequency quadrupole accelerator 20 and the linear acceleration unit 30. The beam mixer 51 is used to achieve longitudinal matching of the beam from the radio frequency quadrupole accelerator 20 to the linear acceleration unit 30. The phase space distribution of the beam at the exit of the radio frequency quadrupole accelerator 20 is opposite in the horizontal and vertical directions, which cannot meet the injection requirements of the linear acceleration unit 30. Therefore, the first matching section 52 is used to match the beam parameters between the upstream and downstream acceleration structures, so that the beam parameters output from the upstream are within the acceptable range of the downstream structure. The first matching section 52 preferably uses three quadrupole magnets. After passing through the first matching section 52 composed of three quadrupole magnets, the phase space distribution of the beam becomes uniform, and the motion trend is focused, thus meeting the injection requirements of the linear acceleration unit 30.

[0037] A beam measuring device (not shown), a deflecting magnet 61, and a second matching section 62 are sequentially installed between adjacent segments of the linear acceleration unit 30. A beam measuring device and a deflecting magnet 61 are installed downstream of the last segment of the linear acceleration unit 30. The beam measuring device monitors changes in beam parameters. The deflecting magnet 61 is switchable between on and off states, used to deflect the beam to a sub-path when on, so that each deflecting magnet 61 serves as a beam extraction position when on, thereby enabling the extraction of beams of different energies. The second matching section 62 not only achieves 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 enables lossless beam transmission when some linear acceleration units 30 are off. The second matching section 62 preferably uses three quadrupole magnets. In other embodiments, the beam measuring device and the second matching section 62 can be replaced or omitted.

[0038] Each deflecting magnet 61 has an isotope production target 73 located in a sub-path of the beam downstream of it. The detachable target body of the isotope production target 73 is periodically transferred to the separation and extraction device 74, thereby achieving isotope production. In this embodiment, a third matching section 71 and an octet field resonator 72 are also provided in the sub-path of the beam between each deflecting magnet 61 and the isotope production target 73. The third matching section 71 ensures that the beam parameters output from the upstream are within the acceptable range of the downstream structure. The third matching section 71 preferably uses three quadrupole magnets. The octet field resonator 72 is used to transform the circular beam into a square beam, primarily using the octet field in the resonator to achieve transverse modulation of the beam. The square beam, by adapting its square shape to the shape of the isotope production target, can increase the uniformity of the beam bombardment of the isotope production target, thereby improving the consistency of isotope production.

[0039] In this embodiment, the sub-paths of the beam are perpendicular to the main path of the beam, and each deflecting magnet 61 corresponds to two sub-paths of the beam, which are opposite in direction to each other. In other embodiments, the sub-paths of the beam form an angle with the main path of the beam (i.e., not necessarily perpendicular), and each deflecting magnet 61 corresponds to one or two sub-paths of the beam.

[0040] The radio frequency quadrupole accelerator (RFQ) 20 includes a radial matching section, a shaping section, a focusing section, and an acceleration section. Thus, the beam exits the ion source system 10 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 focus 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 acceleration 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.

[0041] The radio frequency quadrupole accelerator 20 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.

[0042] The linear acceleration unit 30 is a structure formed by installing a drift tube in the radio frequency cavity to continue accelerating ions. In this embodiment, the linear acceleration unit 30 adopts a drift tube linear accelerator (DTL), specifically an interdigital H-mode drift tube linear accelerator (IH-DTL, Interdigital H-mode Drifting Tube Linac).

[0043] Different linear accelerator units 30 have different rated energy gain values, resulting in different energy gain values ​​for the same ion from different linear accelerator units 30. In this embodiment, the rated energy gain value provided by different linear accelerator units 30 to the beam is determined according to the energy requirements of isotope preparation. Each ion has more than six rated energy points in the range of 8-30 MeV at the beam extraction point, so 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.

[0044] Each type of ion has a rated energy point at each beam extraction position corresponding to the combination of on / off states of all the linear acceleration units 30 upstream, so that the ion is output at the rated energy point at each beam extraction position without fine-tuning. That is, after the rated energy gain values ​​of different linear acceleration units 30 are determined, when the highest energy of the linear accelerator of this invention is required, all linear acceleration units 30 operate simultaneously; when the rated energy point of other targets is required, one or more segments of linear acceleration units 30 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, ensuring 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 segments of linear acceleration units 30 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.

[0045] like Figure 3 As shown, the power source system 40 is a radio frequency (RF) power source used to provide RF power to the linear acceleration unit 30. The linear acceleration unit 30 operates at a frequency of approximately 400MHz, which is in the RF band; while the ion source operates at a frequency of approximately 2.45GHz, which is in the microwave band. The power source system 40 includes two RF power sources 41, a first power combiner 42 connected to the two RF power sources 41 via its input terminal, a spiral delay line 43 and a straight-through line 44 respectively connected to the two output terminals of the first power combiner 42, and a second power combiner 45 connected to the spiral delay line 43 and the straight-through line 44 via its input terminal. The first power combiner has a chopping function to output two signals with different timing sequences.

[0046] The following is combined Figure 3 Describe the working principle of the power source system 40, and the waveform timing of the signal as follows: Figure 3 As shown in the blue rectangle, two RF power sources 41 are combined by a first power combiner 42. The chopping function of the first power combiner 42 splits the input RF signal into two RF signals with different timings, which are output from different ports. The first output signal passes through a spiral delay line 43 and simultaneously reaches the second power combiner 45 through a straight-through line 44, thus merging them into a single signal. This significantly increases the power level of the power source system 40. Therefore, the power of the power source system 40 can be increased by four times, greatly reducing the technical requirements and cost of the power source system 40.

[0047] With the rapid development of computer technology and mechanical automation technology, both the beam generation process in accelerators and the isotope separation and extraction process can be optimized and controlled by parameters. Therefore, this invention quantifies the beam parameters and materials in the separation and purification process in detail, with the final isotope yield and purity as the optimization objectives, and optimizes the values ​​of each parameter for different isotopes.

[0048] To maximize isotope purity and yield while maintaining a high production rate, the optimized beam parameters in the isotope production apparatus based on a multi-particle linear accelerator of this invention include:

[0049] (1) This invention employs a multi-particle linear accelerator, which accelerates charged particles through multiple linear acceleration units 30. The ends of different segments of the linear acceleration units 30 can be deflected by deflecting magnets to extract the beam, thereby achieving energy regulation. The linear acceleration units 30 can be optimized for parameters such as particle type (protons, helium particles, deuterium particles, etc.), particle energy, and particle flux intensity.

[0050] (2) The present invention uses a solid target chamber, which can optimize parameters such as the thickness of the target material, the purity of the target material, and the speed of cooling water;

[0051] (3) The present invention uses wet or dry methods to separate and extract isotopes, and can define parameters such as the type and amount of materials used in different separation and extraction steps.

[0052] (4) This invention employs a multi-frequency ECR ion source with resonant frequency tracking. The ion source has two or more coupling holes, which can feed in radio frequency at different frequencies; at the same time, the frequency is tracked and fed back to the power source. For the ion source 11, parameters such as frequency, feed-in radio frequency power, particle type (proton, helium particle, deuterium particle, etc.) and particle flux intensity can be optimized.

[0053] (5) The power source system of the present invention uses an RF delay device and a power divider to connect to the linear acceleration unit 30, thereby optimizing the shape, length and other parameters of the RF delay system.

[0054] (6) The present invention sets an octagonal field resonant cavity at the front end of the isotope production target. The magnetic field parameters of the octagonal field resonant cavity are optimized so that the circular beam can be transformed into a square beam, thereby improving the consistency of the target firing process.

[0055] The working principle of the isotope production device based on a multi-particle linear accelerator of the present invention can be understood from two dimensions: radio frequency power and beam transmission.

[0056] (1) Radio frequency power is generated from a power source, and the power level is increased by the control of the power source system. Then it enters the acceleration structure through the waveguide system to establish an electric field for accelerating different ions.

[0057] (2) Different gases in the gas cylinder enter the resonant cavity of the ionization chamber. For different gases, microwave sources of different frequencies emit microwave power and enter the resonant cavity to interact with the gas, thereby producing the specified ions. By changing the gas in the gas cylinder and the selectable microwave source, the type of ions can be changed.

[0058] (3) Ions pass through the corresponding extraction electrode, obtain good quality, and then enter the radio frequency structure for acceleration;

[0059] (4) The linear acceleration unit is divided into multiple segments, with different beam energies in different segments, and the energy is continuously increased;

[0060] (5) The beam is extracted by deflecting magnets, and different energies enter different target chambers for the production of different types of isotopes;

[0061] (6) Upstream of the isotope production target, the beam needs to pass through an eight-stage field resonant cavity to modulate the circular beam into a square shape.

[0062] (7) The beam interacts with the isotope production target to produce isotopes;

[0063] (8) Isotope production targets containing isotopes are separated and extracted to obtain high-purity isotopes.

[0064] The isotope production apparatus based on a multi-particle linear accelerator of the present invention uses a linear accelerator, which has a high flux intensity and can effectively improve the yield.

[0065] Furthermore, by employing a multi-segment linear acceleration unit 30 and using deflecting magnets as beam extraction positions, multi-energy beams can be extracted. Multiple different isotopes can be produced simultaneously using the same equipment, achieving a multi-purpose effect and meeting the needs of large-scale production of isotopes on a platform.

[0066] Furthermore, by using different power sources to feed different frequencies into the ion source, high current intensity of different particles can be obtained. Moreover, by using an automatic frequency tracking system to track and provide feedback on the resonant frequency of the ion source cavity in real time, efficient radio frequency coupling can be achieved, and the extracted current intensity can be effectively improved.

[0067] Furthermore, the power source system outputs the required power to different linear acceleration units through a power divider and an RF delay device, allowing multiple linear acceleration units to share the same power source system, which is beneficial for timing control and thus effectively reduces the cost of the device.

[0068] In addition, the present invention provides an octagonal field resonant cavity at the front end of the isotope production target, which can transform the circular beam into a square beam to improve the consistency of the target firing process.

[0069] Furthermore, this invention effectively improves the yield and purity of isotopes by optimizing the parameters of the entire isotope production process.

[0070] 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. An isotope production device based on a multi-particle linear accelerator, characterized in that, It includes an ion source system located on the main path of the straight beam, a radio frequency quadrupole accelerator and multiple linear acceleration units, as well as a power source system; The power source system is connected to a power divider with multiple output branches, and each output branch of the power divider is provided with an RF delay device and a feed end of a section of a linear acceleration unit. Deflection magnets are installed between adjacent segments of the linear acceleration unit and downstream of the last segment. The deflection magnets are switchable between on and off states and are used to deflect the beam to a sub-path of the beam when on. An isotope production target is provided on the sub-path of the beam downstream of each deflection magnet, and the detachable target body of the isotope production target is periodically transferred to the separation and extraction device.

2. The isotope production apparatus based on a multi-particle linear accelerator according to claim 1, characterized in that, The ion source system includes an ion source; the ion source includes an ionization chamber with a resonant cavity, a gas cylinder connected to the ionization chamber, multiple microwave power sources connected to the ionization chamber through multiple coupling holes, and multiple lead-out electrodes located at the outlet of the ionization chamber; the multiple microwave power sources are used to feed microwave power of different frequencies.

3. The isotope production apparatus based on a multi-particle linear accelerator according to claim 2, characterized in that, The number of leads is three, and the distance between them is adjustable.

4. The isotope production apparatus based on a multi-particle linear accelerator according to claim 2, characterized in that, Each microwave power source is equipped with an automatic frequency tracking system, which ensures that the frequency of the microwave power source is always consistent with the current resonant frequency of the ionization chamber by real-time tracking and feedback of the resonant frequency of the resonant cavity.

5. The isotope production apparatus based on a multi-particle linear accelerator according to claim 2, characterized in that, The ion source also includes a spiral tube magnet fitted into the ionization chamber.

6. The isotope production apparatus based on a multi-particle linear accelerator according to claim 2, characterized in that, The ion source system also includes an ion source matching section downstream of the ion source.

7. The isotope production apparatus based on a multi-particle linear accelerator according to claim 1, characterized in that, The power source system includes two radio frequency (RF) power sources, a first power combiner connected to the two RF power sources via its input terminal, a spiral delay line and a straight-through line respectively connected to the two output terminals of the first power combiner, and a second power combiner connected to the spiral delay line and the straight-through line via its input terminal. The first power combiner uses its chopping function to divide the input RF into two RF signals with different timing sequences and outputs them from different output ports. The signal output first passes through the spiral delay line and the signal output later passes through the straight-through line to reach the second power combiner simultaneously, thereby merging them into a single signal.

8. The isotope production apparatus based on a multi-particle linear accelerator according to claim 1, characterized in that, An eight-stage field resonator is provided on the sub-path of the beam between each deflecting magnet and the isotope production target. The eight-stage field resonator is used to transform the circular beam into a square beam.

9. The isotope production apparatus based on a multi-particle linear accelerator according to claim 1, characterized in that, A beam gatherer and a first matching section are provided between the radio frequency quadrupole accelerator and the linear acceleration unit; a beam measuring device, the deflecting magnet, and a second matching section are sequentially installed between two adjacent sections of the linear acceleration unit; a third matching section is also provided on the sub-path of the beam between each deflecting magnet and the isotope production target.

10. The isotope production apparatus based on a multi-particle linear accelerator according to claim 1, characterized in that, The sub-paths of the beam are perpendicular to the main path of the beam, and each deflecting magnet corresponds to two sub-paths of the beam, which are opposite to each other.

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