Radiotherapy device, accelerator maximum flow strength automatic search system and method

Abstract

The application discloses a radiotherapy device, an accelerator maximum flow strength automatic search system and method. The system comprises a cyclotron with opposite first and second outlet ends, and is used for accommodating a first ion source and a second ion source opposite in length direction; the first ion source can move axially away from the second ion source; the second ion source can move axially away from the first ion source; a recording module records all first positions and second positions of the first and second ion sources, and obtains all position combinations corresponding to each first position and second position; a debugging module controls the first and second ion sources to move in positions respectively according to a preset step length; and the cyclotron is controlled to emit a beam under each position combination, and protons generated by the first and second ion sources are introduced, accelerated and led out; a storage module acquires a beam intensity corresponding to each position combination and forms a data set; and a search module searches for a maximum beam intensity from the data set, so that a better radiotherapy effect is ensured.

Description

[0001] This application is a divisional application of the original application with application number CN202410476214.X (filed on April 19, 2024, entitled "Radiotherapy Equipment, Automatic Search System and Method for Maximum Current Intensity of Accelerator"). Technical Field

[0002] This invention relates to the field of high-end medical equipment technology, specifically to radiotherapy equipment, and an automatic maximum current intensity search system and method for accelerators. Background Technology

[0003] An ion source is a subsystem of an accelerator that generates protons at the accelerator's center. The protons generated by the ion source need to be brought into the accelerator's center at a precise location and at the correct time to be successfully accelerated to high energies through the combined action of the radio frequency and magnet subsystems. The proton ion source uses gaseous hydrogen as a starting material and generates protons by ionizing the hydrogen using some form of electromagnetic energy (electric spark, high-voltage electric field, electron bombardment, plasma forming, etc.).

[0004] The ion source is fixed at the center of the cyclotron, with its deviation from the designed vertical source position within 0.1 mm; the ion source must be positioned within its emission region with a deviation of approximately 10%. The ion source must be positioned at the designed horizontal source position relative to the RF extraction electrode, allowing for a certain adjustment range to accommodate changes in other accelerator parameters. The central electrode and magnet are cross-referenced to generate proton pulses in the correct position, accurate to within 0.5 mm, for subsequent acceleration and extraction.

[0005] To meet the requirements of radiotherapy, medical accelerators in radiotherapy equipment need to provide a stable and sufficient quantity of particle beams over a certain period of time. To fully meet hospital needs, higher beam intensities are required at the factory. According to the accelerator's theoretical design, deviations between the ion source and its theoretical position affect the accelerator's beam intensity, leading to poor beam quality. Therefore, multiple adjustments are needed during iterative processes. The current process involves commissioning personnel manually adjusting the ion source probe micrometer inside the accelerator room, then measuring the output beam to find the maximum current reading and the micrometer position.

[0006] The above debugging process has the following problems and shortcomings:

[0007] 1. Manual adjustment: After the beam output is completed at each dial gauge position of the ion source adjustment, it is necessary to wait for more than ten minutes to wait for the radiation level in the machine room to drop to an acceptable level for the human body before entering the machine room to adjust the ion source position again, which seriously affects the beam debugging efficiency.

[0008] 2. Discontinuous adjustment process: The current adjustment method cannot achieve continuous adjustment. During the adjustment process, it is easily affected by other variables, resulting in more adjustments and reducing debugging efficiency.

[0009] 3. Non-automated: The current beam output and current intensity recording are both done manually. The current intensity is recorded in an Excel spreadsheet, and the maximum current intensity and corresponding micrometer position are determined, which is inefficient.

[0010] 4. Low accuracy: Manual adjustment of the ion source position has a large adjustment error. The inaccuracy of the ion source position affects the accuracy of the beam intensity, which is both time-consuming and cannot guarantee the accuracy of the beam intensity, affecting the beam quality and even the radiotherapy effect on the patient.

[0011] This invention solves at least one of the above problems. Summary of the Invention

[0012] The purpose of this invention is to provide an automatic maximum current intensity search system and method for accelerators, enabling remote and automated adjustment of the ion source position, improving the accuracy of ion source position adjustment, ensuring the accuracy of beam intensity, improving debugging efficiency and accuracy, avoiding radiation exposure for debugging personnel, and meeting the requirements of radiotherapy.

[0013] The objective of this invention is achieved through the following technical solution:

[0014] A first aspect of the present invention provides an automatic maximum current intensity search system for accelerators, comprising:

[0015] A cyclotron has a first exit end and a second exit end arranged opposite to each other along the length direction, for accommodating a first ion source and a second ion source arranged opposite to each other along the length direction;

[0016] A first driving component, the fixed end of which is connected to the first outlet end of the cyclotron, and the driving end of which is connected to the first ion source, are used to drive the first ion source to move away from the second ion source along the axial direction.

[0017] The second driving component has a fixed end connected to the second outlet end of the cyclotron and a driving end connected to the second ion source, which is used to drive the second ion source to move away from the first ion source along the axial direction.

[0018] The recording module is connected to the first driving component and the second driving component respectively, and is used to record all first positions of the first ion source position movement and all second positions of the second ion source position movement respectively, and combine each first position with each second position to obtain all position combinations;

[0019] The debugging module is used to set a preset step size, and control the first driving component to move the first ion source according to the preset step size, and the second driving component to move the second ion source according to the preset step size;

[0020] Used to control the cyclotron to emit beams in each position combination, so that the cyclotron simultaneously introduces, accelerates and extracts protons generated by the first ion source and the second ion source;

[0021] The storage module acquires the beam intensity corresponding to each of the aforementioned position combinations, stores each of the aforementioned beam intensities, and forms a data set including all beam intensities.

[0022] The search module searches for the maximum beam intensity from the data set. The maximum beam intensity corresponds to the optimal position combination, which includes the optimal first position of the first ion source and the optimal second position of the second ion source.

[0023] Compared with existing technologies, the beneficial effects of this invention are as follows: This embodiment provides a symmetrical electric field by setting two ion sources, namely a first ion source and a second ion source, to ensure that the electric field effect is strong enough. The first and second ion sources can simultaneously form sufficient plasma and generate enough protons, making it easier to search for the maximum beam intensity. By controlling the first driving component to adjust the position of the first ion source and the second driving component to adjust the position of the second ion source according to a preset step size, the position of the ion source can be remotely adjusted. This eliminates the need to consider the radiation safety issues and waiting time caused by the debugging personnel entering the machine room and cylinder to adjust the position of the ion source each time, avoiding radiation for the debugging personnel and improving the efficiency of beam debugging. Through the automatic adjustment of the ion source position and the automatic search for the maximum beam intensity, the accuracy and efficiency of beam debugging are improved, ensuring better radiotherapy effects and enabling the faster popularization of proton therapy.

[0024] In some possible implementations, the first ion source and the second ion source do not contact each other, and a minimum installation gap of 0.508 mm is provided between the first initial position of the first ion source and the second initial position of the second ion source. The positional movement distance of the first ion source from the first initial position to the first maximum target position and the positional movement distance of the second ion source from the second initial position to the second maximum target position do not exceed 1 mm.

[0025] In some possible implementations, the first driving component includes:

[0026] The first connecting frame has a first end and a second end opposite to each other;

[0027] The first servo motor has a fixed end and a driving end, and the fixed end of the first servo motor is connected to the first end of the first connecting frame.

[0028] A first drive shaft has a first end and a second end, and the first end of the first drive shaft and the drive end of the first servo motor are connected by a first coupling.

[0029] A first ball screw has a first end and a second end opposite to each other, and the first end of the first ball screw and the second end of the first drive shaft are connected by a second coupling.

[0030] A first bearing housing is disposed on the first connecting frame and is located away from the second end of the first connecting frame. The first bearing housing is sleeved on the first ball screw and connected to the first ball screw, and is located near the first end of the first ball screw.

[0031] The second bearing housing is disposed on the first connecting frame and close to the second end of the first connecting frame. The second bearing housing is sleeved on the first ball screw and connected to the first ball screw, and is located near the second end of the first ball screw.

[0032] The first bushing assembly is sleeved on and connected to the first ball screw, and is located between the first bearing housing and the second bearing housing. The first bushing assembly is connected to the first ion source.

[0033] In some possible implementations, the second driving component includes:

[0034] The second connecting frame has a first end and a second end opposite to each other;

[0035] The second servo motor has a fixed end and a driving end, and the fixed end of the second servo motor is connected to the first end of the second connecting frame;

[0036] The second drive shaft has a first end and a second end, and the first end of the second drive shaft and the drive end of the second servo motor are connected by a third coupling.

[0037] The second ball screw has a first end and a second end opposite to each other, and the first end of the second ball screw and the second end of the second drive shaft are connected by a fourth coupling.

[0038] The third bearing housing is disposed on the second connecting frame and away from the second end of the second connecting frame. The third bearing housing is sleeved on the second ball screw and connected to the second ball screw, and is located near the first end of the second ball screw.

[0039] A fourth bearing housing is disposed on the second connecting frame and close to the second end of the second connecting frame. The fourth bearing housing is sleeved on the second ball screw and connected to the second ball screw, and is located near the second end of the second ball screw.

[0040] The second bushing assembly is sleeved on and connected to the second ball screw, and is located between the third bearing seat and the fourth bearing seat. The second bushing assembly is connected to the second ion source.

[0041] In some possible implementations, the first connecting frame is L-shaped and includes:

[0042] The first horizontal plate has a first surface and a second surface that are arranged opposite to each other along the thickness direction. One end of the first horizontal plate is connected to the fixed end of the first servo motor. The first bearing seat and the second bearing seat are both arranged on the first surface of the first horizontal plate.

[0043] The first vertical plate has a first end and a second end. The first end of the first vertical plate is perpendicularly connected to the second surface of the first horizontal plate, and the second end of the first vertical plate is connected to the first outlet end of the cyclotron.

[0044] The first reinforcing plate has a first surface and a second surface that are perpendicular to each other. The first surface of the first reinforcing plate is connected to the second surface of the first horizontal plate, and the second surface of the first reinforcing plate is connected to one surface of the first vertical plate.

[0045] In some possible implementations, the second connecting frame is L-shaped and includes:

[0046] The second horizontal plate has a first surface and a second surface that are arranged opposite to each other along the thickness direction. One end of the second horizontal plate is connected to the fixed end of the second servo motor. The third bearing seat and the fourth bearing seat are both arranged on the first surface of the second horizontal plate.

[0047] The second vertical plate has a first end and a second end. The first end of the second vertical plate is perpendicularly connected to the second surface of the second horizontal plate, and the second end of the second vertical plate is connected to the second outlet end of the cyclotron.

[0048] The second reinforcing plate has a first surface and a second surface that are perpendicular to each other. The first surface of the second reinforcing plate is connected to the second surface of the second horizontal plate, and the second surface of the second reinforcing plate is connected to one surface of the second vertical plate.

[0049] In some possible implementations, the first bushing assembly includes:

[0050] The first nut sleeve is fitted onto the first ball screw and connected to the first ball screw;

[0051] The first fixing sleeve is fitted onto the first nut sleeve, and the two ends of the first fixing sleeve are respectively connected to the first side fixing member;

[0052] The first side fixing member has a first end and a second end along the length direction. The first end of the first side fixing member is connected to the first fixing sleeve, and the second end of the first side fixing member is connected to the first ion source.

[0053] In some possible implementations, the second bushing assembly includes:

[0054] The second nut sleeve is fitted onto the second ball screw and connected to the second ball screw;

[0055] The second fixing sleeve is fitted onto the second nut sleeve, and the two ends of the second fixing sleeve are respectively connected to the second side fixing member;

[0056] The second side fixing member has a first end and a second end along the length direction. The first end of the second side fixing member is connected to the second fixing sleeve, and the second end of the second side fixing member is connected to the second ion source.

[0057] A second aspect of the present invention provides an automatic search method for maximum current intensity in an accelerator, applied to the aforementioned automatic search system for maximum current intensity in an accelerator, the method comprising:

[0058] Set the preset step size;

[0059] According to the preset step size, the first driving component is controlled to move the first ion source from the first initial position to the first maximum target position, and the second driving component is controlled to move the second ion source from the second initial position to the second maximum target position.

[0060] Record all first positions as the first ion source moves from the first initial position to the first maximum target position, and record all second positions as the second ion source moves from the second initial position to the second maximum target position. Combine each first position with each second position to obtain all position combinations.

[0061] The cyclotron is controlled to emit a beam at each position combination so that the cyclotron simultaneously introduces, accelerates and extracts protons generated by the first ion source and the second ion source in sequence.

[0062] Obtain the beam intensity corresponding to each of the aforementioned position combinations, store each of the aforementioned beam intensities, and form a data set including all beam intensities;

[0063] The maximum beam intensity is searched from the data set. The maximum beam intensity corresponds to the optimal position combination. The optimal position combination includes the optimal first position of the first ion source and the optimal second position of the second ion source.

[0064] In some possible implementations, the distance from the first initial position to the first maximum target position and the distance from the second initial position to the second maximum target position can be configured to be equal or unequal.

[0065] In some possible implementations, the preset step size includes a coarse adjustment step size and a fine adjustment step size. When the coarse adjustment step size is larger than the fine adjustment step size, the method includes:

[0066] Coarse adjustment stage: According to the coarse adjustment step size, the first driving component is controlled to move the first ion source from the first initial position to the first preset position, and the second driving component is controlled to move the second ion source from the second initial position to the second preset position.

[0067] Record all first positions during the process of the first ion source moving from the first initial position to the first preset position, and record all second positions during the process of the second ion source moving from the second initial position to the second preset position. Combine each first position with each second position to obtain all combinations of first positions.

[0068] The cyclotron is controlled to emit a beam in each first position combination so that the cyclotron simultaneously introduces, accelerates and extracts protons generated by the first ion source and the second ion source in sequence.

[0069] Obtain the first beam intensity corresponding to each of the first position combinations, store each of the first beam intensities, and form a first data set including all the first beam intensities;

[0070] The maximum first beam intensity is searched from the first data set;

[0071] Obtain the optimal first position combination corresponding to the maximum first beam intensity, wherein the optimal first position combination includes the optimal first position of the corresponding first ion source and the optimal second position of the second ion source;

[0072] Fine-tuning phase: According to the fine-tuning step size, control the first driving component to move the first ion source from the optimal first position to the third preset position, and control the second driving component to move the second ion source from the optimal second position to the fourth preset position;

[0073] Record all third positions during the process of the first ion source moving from the optimal first position to the third preset position, and record all fourth positions during the process of the second ion source moving from the optimal second position to the fourth preset position. Combine each third position with each fourth position to obtain all combinations of second positions.

[0074] The cyclotron is controlled to emit a beam in each of the second position combinations so that the cyclotron simultaneously introduces, accelerates and extracts protons generated by the first ion source and the second ion source in sequence.

[0075] Obtain the second beam intensity corresponding to each second position combination, store each second beam intensity, and form a second data set including all second beam intensities;

[0076] The maximum second beam intensity is searched from the second data set;

[0077] Obtain the optimal second position combination corresponding to the maximum second beam intensity, wherein the optimal second position combination includes the optimal third position of the corresponding first ion source and the optimal fourth position of the second ion source.

[0078] In some possible implementations, the third preset position includes a first initial position or a first maximum target position, and the fourth preset position includes a second initial position or a second maximum target position.

[0079] In some possible implementations, the preset step size includes a first step size, a second step size, ..., an Nth step size, where the first step size > the second step size > ... > the Nth step size.

[0080] A third aspect of the present invention provides a radiotherapy device, the radiotherapy device comprising the above-described automatic maximum current intensity search system for accelerators, the automatic maximum current intensity search system for accelerators employing the above-described automatic maximum current intensity search method for accelerators. Attached Figure Description

[0081] Figure 1 This is a schematic diagram of the automatic maximum current intensity search system for accelerators according to an embodiment of the present invention;

[0082] Figure 2 This is a schematic diagram showing the positional structure of the cyclotron accelerator, the first drive component, and the second drive component according to an embodiment of the present invention;

[0083] Figure 3 This is a schematic diagram showing the position and structure of the cyclotron and the first drive component according to an embodiment of the present invention;

[0084] Figure 4AThis is a schematic diagram of the structure of the first driving component and the second driving component in an embodiment of the present invention. Figure 1 ;

[0085] Figure 4B yes Figure 4A Enlarged view of section S1;

[0086] Figure 5A This is a schematic diagram of the structure of the first driving component and the second driving component in an embodiment of the present invention. Figure 2 ;

[0087] Figure 5B yes Figure 5A Enlarged view of section S2;

[0088] Figure 6 This is a schematic diagram showing the positions of the first and second ion sources under a preset step size in an embodiment of the present invention;

[0089] Figure 7 This is a schematic diagram showing the positions of the first and second ion sources under the preset step size including coarse adjustment step size and fine adjustment step size in an embodiment of the present invention;

[0090] Figure 8 This is a flowchart of the steps of the automatic search method for maximum current intensity of accelerator according to an embodiment of the present invention.

[0091] In the diagram: 1. Cyclotron; 2. First ion source; 3. Second ion source; 4. First drive assembly; 5. Second drive assembly; 6. Recording module; 7. Debugging module; 8. Storage module; 9. Search module; 40. First connecting frame; 41. First servo motor; 42. First drive shaft; 43. First coupling; 44. First ball screw; 45. Second coupling; 46. First bearing housing; 47. Second bearing housing; 48. First bushing assembly; 50. Second connecting frame; 51. Second servo motor; 52. 53. Second drive shaft; 54. Third coupling; 55. Second ball screw; 56. Fourth coupling; 57. Third bearing housing; 58. Fourth bearing housing; 59. Second bushing assembly; 400. First horizontal plate; 401. First vertical plate; 402. First reinforcing plate; 500. Second horizontal plate; 501. Second vertical plate; 502. Second reinforcing plate; 480. First nut sleeve; 481. First fixing sleeve; 482. First side fixing member; 580. Second nut sleeve; 581. Second fixing sleeve; 582. Second side fixing member. Detailed Implementation

[0092] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided to make the invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted.

[0093] The terms used to express position and direction in this invention are illustrated with reference to the accompanying drawings, but changes can be made as needed, and all such changes are included within the scope of protection of this invention.

[0094] The exemplary embodiments will now be described more fully. However, the exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0095] See appendix Figure 1-3 As shown, the automatic maximum current intensity search system for the accelerator in this embodiment includes a cyclotron accelerator 1, a first drive component 4, a second drive component 5, a first ion source 2, a second ion source 3, a recording module 6, a debugging module 7, a storage module 8, and a search module 9.

[0096] The cyclotron accelerator 1 has a first exit end and a second exit end arranged opposite to each other along the length direction. The cyclotron accelerator 1 is used to accommodate a first ion source 2 and a second ion source 3 arranged opposite to each other along the length direction. The cyclotron accelerator 1 can simultaneously introduce, accelerate and extract protons generated by the first ion source 2 and the second ion source 3.

[0097] The debugging module 7 is used to set a preset step size, which controls the first driving component 4 to move the first ion source 2 and the second driving component 5 to move the second ion source 3 according to the preset step size. For example, the preset step size can be 0.2 mm.

[0098] The first driving assembly 4 has a fixed end and a driving end. The fixed end of the first driving assembly 4 is connected to the first outlet end of the cyclotron 1, and the driving end of the first driving assembly 4 is connected to the first ion source 2. The first driving assembly 4 is used to drive the first ion source 2 to move axially away from the second ion source 3 according to a preset step size. Specifically, the first ion source 2 moves from a first initial position to a first maximum target position. For example, the first initial position can be 0 mm in the X-axis, and the first maximum target position can be 1 mm in the X-axis.

[0099] The second driving assembly 5 has a fixed end and a driving end. The fixed end of the second driving assembly 5 is connected to the second outlet end of the cyclotron 1, and the driving end of the second driving assembly 5 is connected to the second ion source 3. The second driving assembly 5 is used to drive the second ion source 3 to move axially away from the first ion source 2 according to a preset step size. Specifically, the second ion source 3 moves from a second initial position to a second maximum target position. For example, the second initial position can be 0 mm in the X-axis, and the second maximum target position can be -1 mm in the X-axis.

[0100] It should be noted that the first initial position and the first maximum target position are the limit positions that the first ion source 2 can move to, and the second initial position and the second maximum target position are the limit positions that the second ion source 3 can move to.

[0101] Specifically, in this embodiment, see Appendix Figure 6 As shown, the first ion source 2 and the second ion source 3 do not contact each other, and a minimum installation gap of 0.508 mm is provided between the first initial position of the first ion source 2 and the second initial position of the second ion source 3. This minimum installation gap has a great influence on the beam intensity and is suitable for adjusting the first and second ion sources to a suitable position, so as to easily ensure the generation of the maximum beam intensity.

[0102] Specifically, in this embodiment, the distance between the first ion source 2 moving from the first initial position to the first maximum target position and the distance between the second ion source 3 moving from the second initial position to the second maximum target position are both no more than 1 mm.

[0103] The axial distance from the first initial position to the first maximum target position and the axial distance from the second initial position to the second maximum target position can be configured to be equal or unequal.

[0104] In this embodiment, the first driving component 4 and the second driving component 5 are preferably of the same specification, have the same shape and structure, and can be configured to be symmetrical with respect to the center of the cyclotron 1. The first ion source 2 at the first initial position and the second ion source 3 at the second initial position are configured to be symmetrical with respect to the center of the cyclotron 1. The first ion source 2 at the first maximum target position and the second ion source 3 at the second maximum target position are configured to be symmetrical with respect to the center of the cyclotron 1.

[0105] The recording module 6 is connected to the first driving component 4 and the second driving component 5 respectively (it can be a communication connection, including a wired connection or a wireless connection). The recording module 6 is used to record all the first positions of the first ion source 2 from the first initial position to the first maximum target position and all the second positions of the second ion source 3 from the second initial position to the second maximum target position, and to combine each first position with each second position to obtain all position combinations.

[0106] This can be understood as follows: for every 0.2mm preset step size, the first ion source 2 moves once, and the recording module 6 records the position once. All first positions include 0mm (first initial position), 0.2mm, 0.4mm, 0.6mm, 0.8mm, and 1mm (first maximum target position) in the X-axis; for every 0.2mm preset step size, the second ion source 3 moves once, and the recording module 6 records the position once. All second positions include 0mm (second initial position), -0.2mm, -0.4mm, -0.6mm, -0.8mm, and -1mm (second maximum target position) in the X-axis.

[0107] All position combinations include (0mm, 0mm), (0mm, -0.2mm), (0mm, -0.4mm), (0mm, -0.6mm), (0mm, -0.8mm), (0mm, -1mm); (0.2mm, 0mm), (0.2mm, -0.2mm), (0.2mm, -0.4mm), (0.2mm, -0.6mm), (0.2mm, -0.8mm), (0.2mm, -1mm); (0.4mm, 0mm), (0.4mm, -0.2mm), (0.4mm, -0.4mm), (0.4mm, -0.6mm), (0.4mm, -0.8mm), (0.4mm, -1mm); (0.6mm, 0mm) , (0.6mm, -0.2mm), (0.6mm, -0.4mm), (0.6mm, -0.6mm), (0.6mm, -0.8mm), (0.6mm, -1mm); (0.8mm, 0mm), (0.8mm, -0.2mm), (0.8mm, -0.4mm), (0.8mm, -0.6mm), (0.8mm, -0.8mm), (0.8mm, -1mm); (1mm, 0mm), (1mm, -0.2mm), (1mm, -0.4mm), (1mm, -0.6mm), (1mm, -0.8mm), (1mm, -1mm), where the first data in each set of parentheses is the first position and the second data is the second position.

[0108] The debugging module 7 is also used to control the cyclotron 1 to output a proton beam at each position combination, so that the cyclotron 1 can simultaneously introduce, accelerate and extract the protons generated by the first ion source 2 and the second ion source 3 into the cyclotron acceleration orbit.

[0109] Storage module 8 is used to acquire the beam intensity corresponding to each position combination, store each beam intensity, and form a data set including all beam intensities. The beam intensity is measured by a Faraday cup electrometer (not shown in the figure), which is located inside the cyclotron 1.

[0110] Search module 9 is used to search for the maximum beam intensity from the data set. The maximum beam intensity corresponds to the optimal position combination of cyclotron 1. The optimal position combination includes the optimal first position of the corresponding first ion source 2 and the optimal second position of the corresponding second ion source 3.

[0111] This embodiment sets up two ion sources, namely the first ion source 2 and the second ion source 3, to provide a symmetrical electric field, ensuring that the electric field effect is strong enough. The first ion source 2 and the second ion source 3 can simultaneously generate enough plasma and produce enough protons, making it easier to search for the maximum beam intensity. By controlling the first driving component 4 to adjust the position of the first ion source 2 and the second driving component 5 to adjust the position of the second ion source 3 according to a preset step size, the remote automated adjustment of the ion source position is achieved. This eliminates the need to consider the radiation safety issues and waiting time caused by the commissioning personnel entering the machine room and rotating the gantry to adjust the ion source position, thus avoiding radiation for the commissioning personnel and improving beam commissioning efficiency. Through automated adjustment of the ion source position and automated search for the maximum beam intensity, the accuracy and efficiency of beam commissioning are improved.

[0112] For some specific implementation methods, see the appendix. Figure 4A-5B As shown, the first drive assembly 4 includes a first connecting frame 40, a first servo motor 41, a first transmission shaft 42, a first ball screw 44, a first bearing housing 46, a second bearing housing 47, and a first bushing assembly 48.

[0113] The first connecting frame 40 has a first end and a second end opposite to each other.

[0114] The first servo motor 41 has a fixed end and a driving end. The fixed end of the first servo motor 41 is connected to the first end of the first connecting frame 40. The first servo motor 41 can be an absolute encoder. The encoder value is directly converted into a position reading (which can be in feet). It can accurately record the first initial position of the first ion source 2 and all the first positions at which the first ion source 2 moves according to a preset step size.

[0115] The first drive shaft 42 has a first end and a second end, and the first end of the first drive shaft 42 and the drive end of the first servo motor 41 are connected by a first coupling 43.

[0116] The first ball screw 44 has a first end and a second end, and the first end of the first ball screw 44 and the second end of the first drive shaft 42 are connected by a second coupling 45.

[0117] The first bearing housing 46 is disposed on the first connecting frame 40 and is located away from the second end of the first connecting frame 40. The first bearing housing 46 is sleeved on the first ball screw 44 and connected to the first ball screw 44, and is located near the first end of the first ball screw 44.

[0118] The second bearing housing 47 is disposed on the first connecting frame 40 and close to the second end of the first connecting frame 40. The second bearing housing 47 is sleeved on the first ball screw 44 and connected to the first ball screw 44, and is located near the second end of the first ball screw 44.

[0119] The first bushing assembly 48 is sleeved on the first transmission shaft 42 and connected to the first ball screw 44, and is located between the first bearing seat 46 and the second bearing seat 47. The first bushing assembly 48 is connected to the first ion source 2.

[0120] The positional distance between the first bearing housing 46 and the second bearing housing 47 can be configured to be 55mm, and the effective range of the first ball screw 44 can be configured to be 54mm.

[0121] The working process of the first drive assembly 4 is as follows: the first servo motor 41 drives the first transmission shaft 42 to rotate through the first coupling 43, and the first transmission shaft 42 drives the first ball screw 44 to rotate through the second coupling 45, so that the first bushing assembly 48 on the first ball screw 44 drives the first ion source 2 to move in the X-axis direction. That is, the rotational motion of the first servo motor 41 is converted into the linear motion of the first bushing assembly 48, thereby realizing the position adjustment of the first ion source 2.

[0122] In some specific embodiments, the second drive assembly 5 includes a second connecting frame 50, a second servo motor 51, a second drive shaft 52, a second ball screw 54, a third bearing seat 56, a fourth bearing seat 57, and a second bushing assembly 58.

[0123] The second connecting bracket 50 has a first end and a second end opposite to each other.

[0124] The second servo motor 51 has a fixed end and a driving end. The fixed end of the second servo motor 51 is connected to the first end of the second connecting bracket 50. The second servo motor 51 and the first servo motor 41 are of the same specification and can use an absolute encoder. The encoder value is directly converted into a position reading (which can be in feet). It can accurately record the second initial position of the second ion source 3 and all the second positions in which the second ion source 3 moves according to a preset step size.

[0125] The second drive shaft 52 has a first end and a second end, and the first end of the second drive shaft 52 and the drive end of the second servo motor 51 are connected by a third coupling 53.

[0126] The second ball screw 54 has a first end and a second end opposite to each other, and the first end of the second ball screw 54 and the second end of the second drive shaft 52 are connected by a fourth coupling 55.

[0127] The third bearing housing 56 is disposed on the second connecting frame 50 and is located away from the second end of the second connecting frame 50. The third bearing housing 56 is sleeved on the second ball screw 54 and connected to the second ball screw 54, and is located near the first end of the second ball screw 54.

[0128] The fourth bearing housing 57 is disposed on the second connecting frame 50 and close to the second end of the second connecting frame 50. The fourth bearing housing 57 is sleeved on the second ball screw 54 and connected to the second ball screw 54, and is located near the second end of the second ball screw 54.

[0129] The second bushing assembly 58 is sleeved on and connected to the second ball screw 54, and is located between the third bearing seat 56 and the fourth bearing seat 57. The second bushing assembly 58 is connected to the second ion source 3.

[0130] The positional distance between the third bearing housing 56 and the fourth bearing housing 57 can be configured to be 55mm, and the effective range of the second ball screw 54 can be configured to be 54mm.

[0131] The working process of the second drive component 5 is as follows: the second servo motor 51 drives the second transmission shaft 52 to rotate through the third coupling 53, and the second transmission shaft 52 drives the second ball screw 54 to rotate through the fourth coupling 55, so that the second bushing assembly 58 on the second ball screw 54 drives the second ion source 3 to move in the X-axis direction. That is, the rotational motion of the second servo motor 51 is converted into the linear motion of the second bushing assembly 58, thereby realizing the position adjustment of the second ion source 3.

[0132] In some specific embodiments, the first connecting frame 40 is L-shaped and includes a first horizontal plate 400 and a first vertical plate 401.

[0133] The first horizontal plate 400 has a first surface and a second surface that are arranged opposite to each other along the thickness direction. One end of the first horizontal plate 400 is connected to the fixed end of the first servo motor 41. The first bearing seat 46 and the second bearing seat 47 are both arranged on the first surface of the first horizontal plate 400.

[0134] The first vertical plate 401 has a first end and a second end. The first end of the first vertical plate 401 is perpendicularly connected to the second surface of the first horizontal plate 400, and the second end of the first vertical plate 401 is connected to the first outlet end of the cyclotron accelerator 1.

[0135] The first connecting frame 40 also includes a first reinforcing plate 402, which is triangular in shape and has a first and a second surface that are perpendicular to each other. The first surface of the first reinforcing plate 402 is connected to the second surface of the first horizontal plate 400, and the second surface of the first reinforcing plate 402 is connected to one surface of the first vertical plate 401.

[0136] The first reinforcing plate 402 improves the connection stability between the first horizontal plate 400 and the first vertical plate 401, ensuring the overall stability of the first connecting frame 40 and ensuring the precise adjustment of the position of the first driving component 4 during the position movement of the first ion source 2.

[0137] In some specific embodiments, the second connecting frame 50 is L-shaped and includes a second horizontal plate 500 and a second vertical plate 501.

[0138] The second horizontal plate 500 has a first surface and a second surface that are arranged opposite to each other along the thickness direction. One end of the second horizontal plate 500 is connected to the fixed end of the second servo motor 51. The third bearing seat 56 and the fourth bearing seat 57 are both arranged on the first surface of the second horizontal plate 500.

[0139] The second vertical plate 501 has a first end and a second end. The first end of the second vertical plate 501 is perpendicularly connected to the second surface of the second horizontal plate 500. The second end of the second vertical plate 501 is connected to the second outlet end of the cyclotron accelerator 1.

[0140] The second connecting frame 50 also includes a second reinforcing plate 502, which is triangular in shape and has a first and a second surface that are perpendicular to each other. The first surface of the second reinforcing plate 502 is connected to the second surface of the second horizontal plate 500, and the second surface of the second reinforcing plate 502 is connected to one surface of the second vertical plate 501.

[0141] The second reinforcing plate 502 improves the connection stability of the second horizontal plate 500 and the second vertical plate 501, ensuring the overall stability of the second connecting frame 50 and ensuring the precise adjustment of the position of the second driving component 5 during the position movement of the second ion source 3.

[0142] In some specific implementation methods, refer to Figure 5B The first bushing assembly 48 includes a first nut sleeve 480, a first fixing sleeve 481, and a first side fixing member 482.

[0143] The first nut sleeve 480 is fitted onto the first ball screw 44 and connected to the first ball screw 44.

[0144] The first fixing sleeve 481 is fitted onto the first nut sleeve 480, and the two ends of the first fixing sleeve 481 are respectively connected to the first side fixing member 482.

[0145] The first side fixing member 482 has a first end and a second end along the length direction. The first end of the first side fixing member 482 is connected to the first fixing sleeve 481, and the second end of the first side fixing member 482 is connected to the first ion source 2.

[0146] To improve the stability of the first ion source 2 during its movement, and to ensure the precise adjustment of the position of the first ion source 2 during the position movement driven by the first driving component 4.

[0147] In some specific embodiments, the second bushing assembly 58 includes a second nut sleeve 580, a second fixing sleeve 581, and a second side fixing member 582.

[0148] The second nut sleeve 580 is fitted onto the second ball screw 54 and connected to the second ball screw 54.

[0149] The second fixing sleeve 581 is fitted onto the second nut sleeve 580, and the two ends of the second fixing sleeve 581 are respectively connected to the second side fixing member 582.

[0150] The second side fixing member 582 has a first end and a second end along the length direction. The first end of the second side fixing member 582 is connected to the second fixing sleeve 581, and the second end of the second side fixing member 582 is connected to the second ion source 3.

[0151] To improve the stability of the second ion source 3 during its movement, and to ensure the precise adjustment of the position of the second ion source 3 during the position movement driven by the second drive component 5.

[0152] It should be noted that the channel in the cyclotron accelerator 1 used to accommodate the first ion source 2 and the second ion source 3 can restrict the first ion source 2 and the second ion source 3 from rotating with the first drive shaft 42 and the second drive shaft 52, and only allow the first ion source 2 and the second ion source 3 to perform linear motion.

[0153] See appendix Figure 8 As shown, this embodiment also provides an automatic search method for maximum current intensity of accelerators, which is applied to the above-mentioned automatic search system for maximum current intensity of accelerators. The method includes steps S1-S6.

[0154] Step S1: Set the preset step size. The setting of the preset step size is related to the control accuracy of the first drive component 4 and the second drive component 5.

[0155] Step S2: According to a preset step size, control the first driving component 4 to move the first ion source 2 from the first initial position to the first maximum target position, and control the second driving component 5 to move the second ion source 3 from the second initial position to the second maximum target position. The control can be synchronous or asynchronous. A schematic diagram of the positions of the first ion source 2 and the second ion source 3 is shown below. Figure 6 As shown.

[0156] Step S3: Record all first positions as the first ion source 2 moves from the first initial position to the first maximum target position, and record all second positions as the second ion source 3 moves from the second initial position to the second maximum target position. Combine each first position with each second position to obtain all position combinations. The recording can be synchronous or asynchronous.

[0157] Step S4: Control the cyclotron 1 to emit beams at each position combination so that the cyclotron 1 simultaneously introduces, accelerates and extracts protons generated by the first ion source 2 and the second ion source 3 in sequence.

[0158] Step S5: Obtain the beam intensity corresponding to each position combination, store each beam intensity, and form a data set including all beam intensities. Optionally, the data set can be stored in an Excel spreadsheet.

[0159] Step S6: Search for the maximum beam current intensity from the dataset. The maximum beam current intensity corresponds to the optimal position combination, which includes the optimal first position of the first ion source 2 and the optimal second position of the second ion source 3. Optionally, the maximum beam current intensity can be searched in an Excel spreadsheet using the VLOOKUP function in conjunction with the MAX or MIN functions.

[0160] In some specific implementations, the preset step size includes a coarse adjustment step size and a fine adjustment step size. When the coarse adjustment step size of 0.02 mm is greater than the fine adjustment step size of 0.005 mm, the method includes a coarse adjustment stage and a fine adjustment stage.

[0161] Coarse adjustment stage: According to the coarse adjustment step size, the first driving component 4 is controlled to move the first ion source 2 from the first initial position to the first preset position, and the second driving component 5 is controlled to move the second ion source 3 from the second initial position to the second preset position.

[0162] Record all first positions during the process of the first ion source 2 moving from the first initial position to the first preset position, and record all second positions during the process of the second ion source 3 moving from the second initial position to the second preset position. Combine each first position with each second position to obtain all combinations of first positions.

[0163] The cyclotron 1 is controlled to emit a beam in each first position combination so that the cyclotron 1 simultaneously introduces, accelerates and extracts protons generated by the first ion source 2 and the second ion source 3 in sequence.

[0164] Obtain the first beam intensity corresponding to each first position combination, store each first beam intensity, and form a first data set including all first beam intensities.

[0165] The maximum first beam intensity is searched from the first data set.

[0166] Obtain the optimal first position combination corresponding to the maximum first beam intensity. The optimal first position combination includes the optimal first position of the corresponding first ion source 2 and the optimal second position of the second ion source 3.

[0167] Fine-tuning stage: According to the fine-tuning step size, the first driving component 4 is controlled to move the first ion source 2 from the optimal first position to the third preset position, and the second driving component 5 is controlled to move the second ion source 3 from the optimal second position to the fourth preset position.

[0168] Record all third positions during the process of the first ion source 2 moving from the optimal first position to the third preset position, and record all fourth positions during the process of the second ion source 3 moving from the optimal second position to the fourth preset position. Combine each third position with each fourth position to obtain all combinations of second positions.

[0169] The cyclotron 1 is controlled to emit a beam in each of the second position combinations so that the cyclotron 1 simultaneously introduces, accelerates and extracts protons generated by the first ion source 2 and the second ion source 3 in sequence.

[0170] Obtain the second beam intensity corresponding to each second position combination, store each second beam intensity, and form a second data set including all second beam intensities.

[0171] The maximum second beam intensity is searched from the second dataset.

[0172] Obtain the optimal second position combination corresponding to the maximum second beam intensity. The optimal second position combination includes the optimal third position of the corresponding first ion source 2 and the optimal fourth position of the second ion source 3.

[0173] In some implementations, the third preset position includes the first initial position or the first maximum target position, and the fourth preset position includes the second initial position or the second maximum target position.

[0174] It should be noted that the third preset position can also be any position from the first initial position to the first maximum target position, and the fourth preset position can also be any position from the second initial position to the second maximum target position. The selection of the third preset position and the fourth preset position are related to the debugging requirements.

[0175] In this embodiment, preferably, the third preset position is the first maximum target position, and the fourth preset position is the second maximum target position. The first initial position and the first maximum target position are the extreme positions that the first ion source 2 can move to, and the second initial position and the second maximum target position are the extreme positions that the second ion source 3 can move to. A schematic diagram of the positions of the first ion source 2 and the second ion source 3 in this embodiment is shown below. Figure 7 As shown.

[0176] When the protons generated by the first ion source 2 and the second ion source 3 enter the Faraday cup electrometer through the beam, a beam current will be generated. The beam intensity can be obtained by measuring the beam current.

[0177] See Table 1, which shows the test data of the beam current corresponding to all first positions, second positions, and first beam intensities during the coarse adjustment stage in this embodiment.

[0178] Table 1

[0179]

[0180] As shown in Table 1, the beam current with the maximum first beam intensity is 0.400 nA, the optimal first position of the first ion source 2 is 0.175 feet, the optimal second position of the second ion source 3 is 0.155 feet, and the optimal combination of the first positions is (0.175, 0.155).

[0181] See Table 2, which shows the test data of the beam current corresponding to all third positions, fourth positions, and second beam intensities during the fine-tuning stage in this embodiment.

[0182] Table 2

[0183]

[0184] As shown in Table 2, the beam current with the maximum second beam intensity is 0.420 nA, the optimal third position of the first ion source 2 is 0.170 feet, the optimal fourth position of the second ion source 3 is 0.155 feet, and the optimal combination of the second positions is (0.170, 0.155).

[0185] As shown in Tables 1 and 2, compared to manual adjustment, remote automated adjustment of the ion source position can be achieved through only the coarse adjustment stage. This allows for the search for the beam current corresponding to the maximum first beam current intensity, quickly obtaining the optimal first beam position, and thus obtaining a more accurate optimal first position for the first ion source 2 and the optimal second position for the second ion source 3. This avoids radiation exposure for the adjustment personnel and improves adjustment efficiency and accuracy. However, the following problems exist: if the coarse adjustment step size is too large, the beam current corresponding to the maximum first beam current intensity obtained is not accurate, resulting in inaccurate optimal first positions for the first ion source 2 and optimal second positions for the second ion source 3, affecting adjustment accuracy; if the coarse adjustment step size is too small, the amount of adjustment data will increase dramatically, significantly increasing the number of adjustments and affecting beam adjustment efficiency. Therefore, adjustment efficiency and accuracy cannot be simultaneously achieved.

[0186] By setting a fine-tuning stage after the coarse-tuning stage, the coarse-tuning stage can reduce the amount of data to be debugged, narrow the search range of the maximum beam current intensity, reduce the number of debugging attempts, and improve beam debugging efficiency. It can quickly find the beam current corresponding to the maximum first beam current intensity and obtain the optimal first position combination, thereby obtaining the optimal first position of the first ion source 2 and the optimal second position of the second ion source 3. The fine-tuning stage can more accurately find the beam current corresponding to the maximum second beam current intensity based on the optimal first position combination, obtain the optimal second position combination, and accurately and quickly find the optimal third position of the first ion source 2 and the optimal fourth position of the second ion source 3, improving debugging accuracy and balancing debugging efficiency and accuracy. Compared with only the coarse-tuning stage, it further improves debugging efficiency and accuracy.

[0187] To further improve the search accuracy for maximum beam intensity, the preset step size can also be set to a first preset step size, a second preset step size, a third preset step size, ..., an Nth preset step size. First preset step size > Second preset step size > Third preset step size > Nth preset step size.

[0188] This embodiment also provides a radiotherapy device, which includes the above-described automatic maximum current intensity search system for accelerators, and the automatic maximum current intensity search system for accelerators applies the above-described automatic maximum current intensity search method for accelerators.

[0189] The aforementioned automatic maximum current intensity search system and method for accelerators improves debugging efficiency and accuracy, which is beneficial for shortening treatment time when using proton beams to treat tumors, ensuring better radiotherapy effects, and enabling proton therapy to be more widely adopted.

[0190] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the invention without departing from the principles and spirit of the invention, and all such changes should fall within the protection scope of the claims of the present invention.

Claims

1. An automatic maximum current intensity search system for an accelerator, characterized in that, include: A cyclotron (1) has a first outlet end and a second outlet end arranged opposite to each other along the length direction for accommodating a first ion source (2) and a second ion source (3) arranged opposite to each other along the length direction; the first ion source (2) can be moved axially away from the second ion source (3); the second ion source (3) can be moved axially away from the first ion source (2). The recording module (6) is used to record all the first positions of the first ion source (2) and all the second positions of the second ion source (3) respectively, and to combine each first position with each second position to obtain all position combinations; The debugging module (7) is used to set a preset step size and control the first ion source (2) to move its position and the second ion source (3) to move its position according to the preset step size. The debugging module is used to control the cyclotron (1) to emit beams at each position combination, so that the cyclotron (1) can simultaneously introduce, accelerate and extract protons generated by the first ion source (2) and the second ion source (3); Storage module (8) is used to obtain the beam intensity corresponding to each of the position combinations, store each of the beam intensities, and form a data set including all beam intensities; The search module (9) is used to search for the maximum beam intensity from the data set.

2. The automatic maximum current intensity search system for accelerators according to claim 1, characterized in that, Also includes: A first driving assembly (4), the fixed end of which is connected to the first outlet end of the cyclotron (1), and the driving end of which is connected to the first ion source (2), for driving the first ion source (2) to move axially away from the second ion source (3); the first driving assembly (4) includes: The first connecting frame (40) has a first end and a second end opposite to each other; The first servo motor (41) has a fixed end and a driving end, and the fixed end of the first servo motor (41) is connected to the first end of the first connecting frame (40). The first drive shaft (42) has a first end and a second end opposite to each other. The first end of the first drive shaft (42) and the drive end of the first servo motor (41) are connected by a first coupling (43). The first ball screw (44) has a first end and a second end opposite to each other, and the first end of the first ball screw (44) and the second end of the first drive shaft (42) are connected by a second coupling (45). The first bearing seat (46) is disposed on the first connecting frame (40) and is located away from the second end of the first connecting frame (40). The first bearing seat (46) is sleeved on the first ball screw (44) and connected to the first ball screw (44), and is located near the first end of the first ball screw (44). The second bearing seat (47) is disposed on the first connecting frame (40) and close to the second end of the first connecting frame (40). The second bearing seat (47) is sleeved on the first ball screw (44) and connected to the first ball screw (44), and is located near the second end of the first ball screw (44). The first bushing assembly (48) is sleeved on the first ball screw (44) and connected to the first ball screw (44), and is located between the first bearing seat (46) and the second bearing seat (47). The first bushing assembly (48) is connected to the first ion source (2). The second driving component (5) has a fixed end connected to the second outlet end of the cyclotron (1) and a driving end connected to the second ion source (3), which is used to drive the second ion source (3) to move its position away from the first ion source (2) along the axial direction. The second driving component (5) includes: The second connecting bracket (50) has a first end and a second end opposite to each other; The second servo motor (51) has a fixed end and a driving end, and the fixed end of the second servo motor (51) is connected to the first end of the second connecting frame (50). The second drive shaft (52) has a first end and a second end opposite to each other. The first end of the second drive shaft (52) and the drive end of the second servo motor (51) are connected by a third coupling (53). The second ball screw (54) has a first end and a second end opposite to each other, and the first end of the second ball screw (54) and the second end of the second drive shaft (52) are connected by a fourth coupling (55). The third bearing seat (56) is disposed on the second connecting frame (50) and away from the second end of the second connecting frame (50). The third bearing seat (56) is sleeved on the second ball screw (54) and connected to the second ball screw (54), and is located near the first end of the second ball screw (54). The fourth bearing seat (57) is disposed on the second connecting frame (50) and close to the second end of the second connecting frame (50). The fourth bearing seat (57) is sleeved on the second ball screw (54) and connected to the second ball screw (54), and is located near the second end of the second ball screw (54). The second bushing assembly (58) is sleeved on the second ball screw (54) and connected to the second ball screw (54), and is located between the third bearing seat (56) and the fourth bearing seat (57). The second bushing assembly (58) is connected to the second ion source (3). The debugging module (7) also controls the first driving component (4) to move the first ion source (2) according to the preset step size and the second driving component (5) to move the second ion source (3) according to the preset step size; the recording module (6) is also used to connect to the first driving component (4) and the second driving component (5) respectively.

3. The automatic maximum current intensity search system for accelerators according to claim 1, characterized in that, The first ion source (2) and the second ion source (3) do not contact each other, and a minimum installation gap of 0.508 mm is provided between the first initial position of the first ion source (2) and the second initial position of the second ion source (3); and / or, the position movement distance of the first ion source (2) from the first initial position to the first maximum target position and the position movement distance of the second ion source (3) from the second initial position to the second maximum target position do not exceed 1 mm; and / or, the maximum beam intensity corresponds to the optimal position combination, and the optimal position combination includes the corresponding optimal first position of the first ion source (2) and the optimal second position of the second ion source (3).

4. The automatic maximum current intensity search system for accelerators according to claim 2, characterized in that, The first connecting frame (40) is L-shaped and includes: The first horizontal plate (400) has a first surface and a second surface that are arranged opposite to each other along the thickness direction. One end of the first horizontal plate (400) is connected to the fixed end of the first servo motor (41). The first bearing seat (46) and the second bearing seat (47) are both arranged on the first surface of the first horizontal plate (400). The first vertical plate (401) has a first end and a second end. The first end of the first vertical plate (401) is perpendicularly connected to the second surface of the first horizontal plate (400). The second end of the first vertical plate (401) is connected to the first outlet end of the cyclotron (1). The first reinforcing plate (402) has a first surface and a second surface perpendicular to each other. The first surface of the first reinforcing plate (402) is connected to the second surface of the first horizontal plate (400), and the second surface of the first reinforcing plate (402) is connected to one surface of the first vertical plate (401); and / or, the second connecting frame (50) is L-shaped and includes: The second horizontal plate (500) has a first surface and a second surface arranged opposite to each other along the thickness direction. One end of the second horizontal plate (500) is connected to the fixed end of the second servo motor (51). The third bearing seat (56) and the fourth bearing seat (57) are both arranged on the first surface of the second horizontal plate (500). The second vertical plate (501) has a first end and a second end. The first end of the second vertical plate (501) is perpendicularly connected to the second surface of the second horizontal plate (500). The second end of the second vertical plate (501) is connected to the second outlet end of the cyclotron (1). The second reinforcing plate (502) has a first surface and a second surface perpendicular to each other. The first surface of the second reinforcing plate (502) is connected to the second surface of the second horizontal plate (500), and the second surface of the second reinforcing plate (502) is connected to one surface of the second vertical plate (501); and / or, the first bushing assembly (48) includes: The first nut sleeve (480) is sleeved on the first ball screw (44) and connected to the first ball screw (44); The first fixing sleeve (481) is sleeved on the first nut sleeve (480), and the two ends of the first fixing sleeve (481) are respectively connected to the first side fixing member (482); A first side fixing member (482) has a first end and a second end along its length, the first end of the first side fixing member (482) being connected to the first fixing sleeve (481), and the second end of the first side fixing member (482) being connected to the first ion source (2); and / or, the second bushing assembly (58) includes: The second nut sleeve (580) is sleeved on the second ball screw (54) and connected to the second ball screw (54); The second fixing sleeve (581) is sleeved on the second nut sleeve (580), and the two ends of the second fixing sleeve (581) are respectively connected to the second side fixing member (582); The second side fixing member (582) has a first end and a second end along the length direction. The first end of the second side fixing member (582) is connected to the second fixing sleeve (581), and the second end of the second side fixing member (582) is connected to the second ion source (3).

5. An automatic search method for maximum current intensity in an accelerator, characterized in that, The method, applied to the automatic maximum current intensity search system for accelerators according to any one of claims 1-4, comprises: Set the preset step size; According to the preset step size, the first ion source (2) is controlled to move from the first initial position to the first maximum target position, and the second ion source (3) is controlled to move from the second initial position to the second maximum target position. Record all first positions during the process of the first ion source (2) moving from the first initial position to the first maximum target position, and record all second positions during the process of the second ion source (3) moving from the second initial position to the second maximum target position. Combine each first position with each second position to obtain all position combinations. The cyclotron (1) is controlled to emit beams at each position combination, so that the cyclotron (1) simultaneously introduces, accelerates and extracts protons generated by the first ion source (2) and the second ion source (3) in sequence; Obtain the beam intensity corresponding to each of the aforementioned position combinations, store each of the aforementioned beam intensities, and form a data set including all beam intensities; The maximum beam intensity is searched from the dataset.

6. The automatic search method for maximum current intensity of an accelerator according to claim 5, characterized in that, The distance from the first initial position to the first maximum target position and the distance from the second initial position to the second maximum target position can be configured to be equal or unequal; and / or, the maximum beam intensity corresponds to an optimal position combination, the optimal position combination including the optimal first position of the corresponding first ion source (2) and the optimal second position of the corresponding second ion source (3).

7. The automatic search method for maximum current intensity of an accelerator according to claim 5, characterized in that, The preset step size includes a coarse adjustment step size and a fine adjustment step size, wherein the coarse adjustment step size is greater than the fine adjustment step size, and the method includes: Coarse adjustment stage: According to the coarse adjustment step size, control the first ion source (2) to move from the first initial position to the first preset position and the second ion source (3) to move from the second initial position to the second preset position respectively; Record all first positions during the process of the first ion source (2) moving from the first initial position to the first preset position, and record all second positions during the process of the second ion source (3) moving from the second initial position to the second preset position. Combine each first position with each second position to obtain all combinations of first positions. The cyclotron (1) is controlled to emit a beam at each first position combination, so that the cyclotron (1) simultaneously introduces, accelerates and extracts protons generated by the first ion source (2) and the second ion source (3) in sequence; Obtain the first beam intensity corresponding to each of the first position combinations, store each of the first beam intensities, and form a first data set including all the first beam intensities; The maximum first beam intensity is searched from the first data set; Obtain the optimal first position combination corresponding to the maximum first beam intensity, wherein the optimal first position combination includes the optimal first position of the corresponding first ion source (2) and the optimal second position of the second ion source (3); Fine-tuning stage: According to the fine-tuning step size, the first ion source (2) is moved from the optimal first position to the third preset position, and the second ion source (3) is moved from the optimal second position to the fourth preset position; Record all third positions during the process of the first ion source (2) moving from the optimal first position to the third preset position, and all fourth positions during the process of the second ion source (3) moving from the optimal second position to the fourth preset position. Combine each third position with each fourth position to obtain all combinations of second positions. The cyclotron (1) is controlled to emit a beam in each of the second position combinations, so that the cyclotron (1) simultaneously introduces, accelerates and extracts the protons generated by the first ion source (2) and the second ion source (3) in sequence; Obtain the second beam intensity corresponding to each second position combination, store each second beam intensity, and form a second data set including all second beam intensities; The maximum second beam intensity is searched from the second data set; Obtain the optimal second position combination corresponding to the maximum second beam intensity. The optimal second position combination includes the optimal third position of the corresponding first ion source (2) and the optimal fourth position of the second ion source (3).

8. The automatic search method for maximum current intensity of an accelerator according to claim 7, characterized in that, The preset step size includes a first step size, a second step size, ..., an Nth step size, where the first step size > the second step size > ... > the Nth step size; and / or, the third preset position includes a first initial position or a first maximum target position, and the fourth preset position includes a second initial position or a second maximum target position.

9. A radiotherapy device, characterized in that, The radiotherapy device includes the accelerator maximum current intensity automatic search system according to any one of claims 1-4, wherein the accelerator maximum current intensity automatic search system applies the accelerator maximum current intensity automatic search method according to any one of claims 5-8.

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