Radiotherapy equipment, accelerator maximum flow intensity automatic search system and method

Abstract

The invention discloses radiotherapy equipment and an automatic searching system and method for the maximum flow intensity of an accelerator, and the system comprises a cyclotron which is provided with a first outlet end and a second outlet end which are opposite, and is used for accommodating a first ion source and a second ion source which are opposite in the length direction; the first ion source can move away from the second ion source in the axial direction. The second ion source can move away from the first ion source in the axial direction. The recording module records all first positions and second positions of movement of the first ion source and the second ion source, and all position combinations are obtained by enabling each first position to correspond to the corresponding second position; the debugging module respectively controls the first ion source and the second ion source to move according to a preset step length; the cyclotron is controlled to emit beams at each position combination, and protons generated by the first ion source and the second ion source are introduced, accelerated and led out; the storage module is used for acquiring and storing the beam intensity corresponding to each position combination to form a data set; and the search module searches the 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 (the application date is April 19, 2024, and the invention name is Radiotherapy Equipment, Accelerator Maximum Current Intensity Automatic Search System and Method). Technical Field

[0002] The present invention relates to the technical field of high-end medical equipment, and in particular to a system and method for automatically searching for maximum current intensity of a radiotherapy device and an accelerator. Background Art

[0003] The ion source is a subsystem of the accelerator that produces protons in the center of the accelerator. The protons produced by the ion source need to be brought into the center of the accelerator at a precise position and at the right time so that they can be successfully accelerated to high energy under the combined action of the radio frequency and magnet subsystems. The proton ion source uses gaseous hydrogen as the starting material and ionizes the hydrogen to produce protons by applying some kind of electromagnetic energy (electric spark, high voltage electric field, electron bombardment, plasma forming, etc.).

[0004] The ion source is fixed in the center of the cyclotron to within 0.1 mm of the designed vertical source position; the ion source must be positioned within its emission region with a deviation of about 10%. The ion source must be positioned at the horizontal designed source position relative to the RF extraction electrode, with a certain adjustment range to cope with the effects of changes in other accelerator parameters. The central region electrode and magnet are referenced to each other so that the proton pulse is generated in the correct position, that is, aligned to within 0.5 mm, for subsequent acceleration and extraction.

[0005] In order to meet the requirements of radiotherapy, the medical accelerator in the radiotherapy equipment needs to provide a stable and sufficient number of particle beams within a certain period of time. In order to fully meet the needs of hospitals, a higher beam intensity needs to be achieved in the factory. According to the theoretical design of the accelerator, the deviation of the ion source from the theoretical position will affect the beam intensity of the accelerator, resulting in low beam quality, so it needs to be adjusted multiple times during the iteration process. The current process is that the debugging personnel enter the accelerator room to manually adjust the ion source probe micrometer, and then output the beam for measurement to find the maximum flow reading and 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 micrometer position of the ion source adjustment, it is necessary to wait for more than ten minutes until the radiation level in the machine room drops to an acceptable level for the human body before entering the machine room to adjust the ion source position, which seriously affects the efficiency of beam debugging.

[0008] 2. The adjustment process is not continuous: The current adjustment method cannot achieve continuous adjustment. During the adjustment process, it is easy to be affected by other variables and affect the adjustment results, resulting in more adjustments and reducing debugging efficiency.

[0009] 3. Non-automation: Currently, the beam output and recording of flux are done manually. The flux is recorded in an Excel table, and the maximum flux and the corresponding micrometer position are determined, which is inefficient.

[0010] 4. The accuracy is not high. There is a large adjustment error in manually adjusting the position of the ion source. The inaccurate position of the ion source affects the accuracy of the beam intensity, which is time-consuming and cannot guarantee the accuracy of the beam intensity, affecting the beam quality and even affecting the radiotherapy effect on the patient.

[0011] The present invention solves at least one of the above problems. Summary of the invention

[0012] The purpose of the present invention is to provide an accelerator maximum current automatic search system and method, realize remote automatic adjustment of the ion source position, improve the accuracy of ion source position adjustment, ensure the accuracy of beam intensity, improve debugging efficiency and accuracy, avoid radiation of debugging personnel, and meet the requirements of radiotherapy.

[0013] The purpose of the present invention is achieved by the following technical solutions:

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

[0015] A cyclotron accelerator having a first outlet end and a second outlet end disposed opposite to each other along a length direction, and used for accommodating a first ion source and a second ion source disposed opposite to each other along the length direction;

[0016] a first driving assembly, wherein a fixed end of the first driving assembly is connected to a first outlet end of the cyclotron, and a driving end of the first driving assembly is connected to a first ion source, and is used to drive the first ion source to move axially away from the second ion source;

[0017] a second driving assembly, wherein a fixed end of the second driving assembly is connected to a second outlet end of the cyclotron, and a driving end of the second driving assembly is connected to a second ion source, and is used to drive the second ion source to move axially away from the first ion source;

[0018] a recording module, connected to the first driving assembly and the second driving assembly, respectively, for recording all first positions of the first ion source position movement and all second positions of the second ion source position movement, and combining each first position with each second position to obtain all position combinations;

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

[0020] for controlling the cyclotron to emit beams 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;

[0021] A storage module, which obtains the beam intensity corresponding to each of the position combinations, stores each of the beam intensity, and forms a data set including all beam intensities;

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

[0023] Compared with the prior art, the beneficial effects of the present 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 large enough, and the first ion source and the second ion source can simultaneously form sufficient plasma and generate sufficient protons, so as to facilitate the search for the maximum beam intensity; by controlling the first drive component to adjust the position of the first ion source and the second drive component to adjust the position of the second ion source according to a preset step size, remote adjustment of the ion source position is achieved, thereby eliminating the need to consider the radiation safety issues and waiting time caused by the debugging personnel entering the machine room and the cylinder to adjust the ion source position each time, thereby avoiding radiation exposure of the debugging personnel and improving the beam debugging efficiency; by automatically adjusting the ion source position and automatically searching for the maximum beam intensity, the beam debugging accuracy and debugging efficiency are improved, thereby ensuring better radiotherapy effects and making proton therapy more popular faster.

[0024] In some possible embodiments, the first ion source and the second ion source do not contact each other, and a minimum installation gap is set between the first initial position of the first ion source and the second initial position of the second ion source, and the minimum installation gap is 0.508 mm. The position movement distance of the first ion source from the first initial position to the first maximum target position and the position 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] A first connecting frame having a first end and a second end opposite to each other;

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

[0028] A first transmission shaft having a first end and a second end opposite to each other, wherein the first end of the first transmission shaft and the driving end of the first servo motor are connected via a first coupling;

[0029] A first ball screw having a first end and a second end opposite to each other, wherein the first end of the first ball screw and the second end of the first transmission shaft are connected via a second coupling;

[0030] A first bearing seat is arranged on the first connecting frame and is away from the second end of the first connecting frame, the first bearing seat 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] a second bearing seat, disposed on the first connecting frame and close to the second end of the first connecting frame, the second bearing seat being sleeved on and connected to the first ball screw and located near the second end of the first ball screw;

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

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

[0034] A second connecting frame having a first end and a second end opposite to each other;

[0035] A 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] A second transmission shaft having a first end and a second end opposite to each other, the first end of the second transmission shaft and the driving end of the second servo motor being connected via a third coupling;

[0037] a second ball screw having a first end and a second end opposite to each other, the first end of the second ball screw and the second end of the second transmission shaft being connected via a fourth coupling;

[0038] a third bearing seat, arranged on the second connecting frame and away from the second end of the second connecting frame, the third bearing seat being sleeved on the second ball screw and connected to the second ball screw and being located near the first end of the second ball screw;

[0039] a fourth bearing seat, disposed on the second connecting frame and close to the second end of the second connecting frame, the fourth bearing seat being sleeved on the second ball screw and connected to the second ball screw and located near the second end of the second ball screw;

[0040] The second sleeve 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 sleeve assembly is connected to the second ion source.

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

[0042] A first transverse plate has a first surface and a second surface that are arranged opposite to each other in a thickness direction, one end of the first transverse plate is connected to a fixed end of the first servo motor, and the first bearing seat and the second bearing seat are both arranged on the first surface of the first transverse plate;

[0043] A first vertical plate having a first end and a second end, wherein the first end of the first vertical plate is vertically 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 which 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] A second transverse plate has a first surface and a second surface that are arranged opposite to each other in the thickness direction, one end of the second transverse plate is connected to the fixed end of the second servo motor, and the third bearing seat and the fourth bearing seat are both arranged on the first surface of the second transverse plate;

[0047] A second vertical plate, having a first end and a second end, the first end of the second vertical plate being vertically connected to the second surface of the second horizontal plate, and the second end of the second vertical plate being connected to the second outlet end of the cyclotron;

[0048] The second reinforcing plate has a first surface and a second surface which 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 sleeve assembly includes:

[0050] A first nut sleeve, sleeved on the first ball screw and connected to the first ball screw;

[0051] A first fixing sleeve is sleeved on the first nut sleeve, and two ends of the first fixing sleeve are respectively connected to first side fixing members;

[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 sleeve assembly includes:

[0054] A second nut sleeve, sleeved on the second ball screw and connected to the second ball screw;

[0055] A second fixing sleeve is sleeved on the second nut sleeve, and two ends of the second fixing sleeve are respectively connected to second side fixing members;

[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 accelerator maximum current intensity automatic search method, which is applied to the above-mentioned accelerator maximum current intensity automatic search system, and the method comprises:

[0058] Setting the preset step length;

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

[0060] Respectively record all first positions of the first ion source in a process of moving from a first initial position to a first maximum target position, and all second positions of the second ion source in a process of moving from a second initial position to a second maximum target position, and combine each first position with each second position to obtain all position combinations;

[0061] Controlling the cyclotron to emit beams 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] Acquire the beam intensity corresponding to each of the position combinations, store each of the beam intensity, and form a data set including all beam intensities;

[0063] A maximum beam current intensity is searched out from the data set, the maximum beam current intensity corresponds to an optimal position combination, and the optimal position combination includes the corresponding 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, and when the coarse adjustment step size is greater than the fine adjustment step size, the method includes:

[0066] Coarse adjustment stage: controlling the first driving component to drive the first ion source to move from the first initial position to the first preset position, and the second driving component to drive the second ion source to move from the second initial position to the second preset position according to the coarse adjustment step size;

[0067] Respectively record all first positions of the first ion source in a process of moving from a first initial position to a first preset position, and all second positions of the second ion source in a process of moving from a second initial position to a second preset position, and combine each first position with each second position to obtain all first position combinations;

[0068] Controlling the cyclotron to emit beams 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] Acquire a 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;

[0070] Searching for a maximum first beam intensity from the first data set;

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

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

[0073] Respectively record all third positions of the first ion source in the process of moving from the optimal first position to the third preset position, and all fourth positions of the second ion source in the process of moving from the optimal second position to the fourth preset position, and combine each third position with each fourth position to obtain all second position combinations;

[0074] Controlling the cyclotron to emit beams at each second 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;

[0075] Acquire a 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] Searching for a maximum second beam intensity from the second data set;

[0077] An optimal second position combination corresponding to the maximum second beam current intensity is obtained, where the optimal second position combination includes the corresponding optimal third position of the 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 length includes a first step length, a second step length, ..., an Nth step length, and the first step length>the second step length>...>the Nth step length.

[0080] A third aspect of the present invention provides a radiotherapy device, the radiotherapy device comprising the above-mentioned accelerator maximum current intensity automatic search system, the accelerator maximum current intensity automatic search system applying the above-mentioned accelerator maximum current intensity automatic search method. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0082] Figure 2 It is a schematic diagram of the position structure of the cyclotron, the first drive assembly, and the second drive assembly according to an embodiment of the present invention;

[0083] Figure 3 is a schematic diagram of the position structure of a cyclotron and a first driving assembly according to an embodiment of the present invention;

[0084] Figure 4AThe structure diagram of the first drive assembly and the second drive assembly of the embodiment of the present invention is shown in FIG. Figure 1 ;

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

[0086] Figure 5A The structure diagram of the first drive assembly and the second drive assembly of the embodiment of the present invention is shown in FIG. Figure 2 ;

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

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

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

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

[0091] In the figure: 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 transmission shaft; 43, first coupling; 44, first ball screw; 45, second coupling; 46, first bearing seat; 47, second bearing seat; 48, first sleeve assembly; 50, second connecting frame; 51, second servo motor; 52, The second transmission shaft; 53, the third coupling; 54, the second ball screw; 55, the fourth coupling; 56, the third bearing seat; 57, the fourth bearing seat; 58, the second sleeve assembly; 400, the first horizontal plate; 401, the first vertical plate; 402, the first reinforcing plate; 500, the second horizontal plate; 501, the second vertical plate; 502, the second reinforcing plate; 480, the first nut sleeve; 481, the first fixing sleeve; 482, the first side fixing piece; 580, the second nut sleeve; 581, the second fixing sleeve; 582, the second side fixing piece. DETAILED DESCRIPTION

[0092] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete and to fully convey the concepts of example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their repeated description will be omitted.

[0093] The words expressing positions and directions described in the present invention are all explained with reference to the accompanying drawings as examples, but they can be changed as needed, and all such changes are included in the protection scope of the present 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; on the contrary, these embodiments are provided to make the present invention more comprehensive and complete and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0095] See attached Figure 1-3 As shown, the accelerator maximum current automatic search system of this embodiment includes a cyclotron 1, a first driving component 4, a second driving 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 1 has a first outlet end and a second outlet end which are arranged opposite to each other along the length direction. The cyclotron 1 is used to accommodate a first ion source 2 and a second ion source 3 which are arranged opposite to each other along the length direction. The cyclotron 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 length, and control the first driving component 4 to drive the first ion source 2 to move according to the preset step length, and the second driving component 5 to drive the second ion source 3 to move according to the preset step length. For example, the preset step length may 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. 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 length. Specifically, the first ion source 2 moves from the first initial position to the first maximum target position. For example, the first initial position may be 0 mm in the X-axis direction, and the first maximum target position may be 1 mm in the X-axis direction.

[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. 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 length. Specifically, the second ion source 3 moves from the second initial position to the second maximum target position. For example, the second initial position may be 0 mm in the X-axis direction, and the second maximum target position may be -1 mm in the X-axis direction.

[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 the attached 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 is set between the first initial position of the first ion source 2 and the second initial position of the second ion source 3. The minimum installation gap is 0.508 mm. The minimum installation gap has a great influence on the beam intensity and is suitable for adjusting the first and second ion sources to appropriate positions, which can easily ensure the generation of maximum beam intensity.

[0102] Specifically, in this embodiment, the moving distance of the first ion source 2 from the first initial position to the first maximum target position and the moving distance of the second ion source 3 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] Among them, in this embodiment, the first drive component 4 and the second drive component 5 are preferably of the same specification, the same shape and structure, and can be configured to be symmetrical relative 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 relative to the center of the cyclotron 1, and 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 relative 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 respectively record all first positions of the first ion source 2 moving from the first initial position to the first maximum target position, and all second positions of the second ion source 3 moving from the second initial position to the second maximum target position, and combine each first position with each second position to obtain all position combinations.

[0106] It can be understood that each time the first ion source 2 moves once according to the preset step size of 0.2 mm, the recording module 6 records the position once, and all first positions include 0 mm (first initial position), 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm, and 1 mm (first maximum target position) in the X-axis direction; each time the second ion source 3 moves once according to the preset step size of 0.2 mm, the recording module 6 records the position once, and all second positions include 0 mm (second initial position), -0.2 mm, -0.4 mm, -0.6 mm, -0.8 mm, and -1 mm (second maximum target position) in the X-axis direction.

[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 bracket 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 emit beams, i.e., deliver proton beams, at each position combination, so that the cyclotron 1 can simultaneously introduce protons generated by the first ion source 2 and the second ion source 3 into the cyclotron orbit, accelerate them, and extract them from the cyclotron.

[0109] The storage module 8 is used to obtain 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, and the Faraday cup electrometer (not shown in the figure) is arranged in the cyclotron 1.

[0110] The 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 the cyclotron 1 . 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 .

[0111] In this embodiment, two ion sources, namely, a first ion source 2 and a second ion source 3, are provided to provide a symmetrical electric field, thereby ensuring that the electric field effect is large enough, so that the first ion source 2 and the second ion source 3 can simultaneously form sufficient plasma and generate sufficient protons, thereby facilitating the search for the maximum beam intensity; by controlling the first drive component 4 to adjust the position of the first ion source 2 and the second drive component 5 to adjust the position of the second ion source 3 according to a preset step length, remote automatic adjustment of the ion source position is achieved, thereby eliminating the need to consider the radiation safety issues and waiting time caused by the debugging personnel entering the machine room and rotating the frame to fix the cyclotron accelerator cylinder each time to adjust the ion source position, thereby avoiding radiation exposure to the debugging personnel and improving the beam debugging efficiency; through the automatic adjustment of the ion source position and the automatic search for the maximum beam intensity, the beam debugging accuracy and debugging efficiency are improved.

[0112] In some specific embodiments, see the attached Figures 4A-5B As shown, the first driving 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 seat 46 , a second bearing seat 47 and a first sleeve 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, and 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 use an absolute encoder, and the value of the encoder is directly converted into a position reading (which can be feet), which can accurately record the first initial position of the first ion source 2 and all first positions of the first ion source 2 moved according to a preset step length.

[0115] The first transmission shaft 42 has a first end and a second end opposite to each other. The first end of the first transmission shaft 42 and the driving end of the first servo motor 41 are connected via a first coupling 43 .

[0116] The first ball screw 44 has a first end and a second end opposite to each other. The first end of the first ball screw 44 and the second end of the first transmission shaft 42 are connected via a second coupling 45 .

[0117] The first bearing seat 46 is disposed on the first connecting frame 40 and is 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 .

[0118] The second bearing seat 47 is disposed on the first connecting frame 40 and is 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 .

[0119] The first sleeve 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 sleeve assembly 48 is connected to the first ion source 2 .

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

[0121] The working process of the first driving 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 sleeve assembly 48 on the first ball screw 44 drives the first ion source 2 to move the position 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 sleeve assembly 48, thereby realizing the position adjustment of the first ion source 2.

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

[0123] The second connecting frame 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, and the fixed end of the second servo motor 51 is connected to the first end of the second connecting frame 50. The second servo motor 51 and the first servo motor 41 are of the same specification, and an absolute encoder can be used. The encoder value is directly converted into a position reading (which can be feet), which can accurately record the second initial position of the second ion source 3 and all second positions of the second ion source 3 moved according to a preset step length.

[0125] The second transmission shaft 52 has a first end and a second end opposite to each other. The first end of the second transmission shaft 52 and the driving end of the second servo motor 51 are connected via a third coupling 53 .

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

[0127] The third bearing seat 56 is disposed on the second connecting frame 50 and is 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 .

[0128] The fourth bearing seat 57 is disposed on the second connecting frame 50 and is 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 .

[0129] The second sleeve 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 sleeve assembly 58 is connected to the second ion source 3 .

[0130] Among them, the position distance between the third bearing seat 56 and the fourth bearing seat 57 can be configured to be 55 mm, and the effective range of the second ball screw 54 can be configured to be 54 mm.

[0131] The working process of the second driving assembly 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 shaft sleeve assembly 58 on the second ball screw 54 drives the second ion source 3 to move the position 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 shaft sleeve assembly 58, thereby realizing the position adjustment of the second ion source 3.

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

[0133] The first transverse plate 400 has a first surface and a second surface that are arranged opposite to each other in the thickness direction. One end of the first transverse 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 transverse 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 vertically 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 1 .

[0135] The first connecting frame 40 also includes a first reinforcing plate 402, which is triangular in shape and has a first surface 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 , ensures the overall stability of the first connecting frame 40 , and ensures that the first driving assembly 4 drives the first ion source 2 to perform precise position adjustment during position movement.

[0137] In some specific implementations, the second connecting frame 50 is L-shaped, including a second transverse plate 500 and a second vertical plate 501 .

[0138] The second transverse plate 500 has a first surface and a second surface arranged opposite to each other in the thickness direction. One end of the second transverse 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 transverse 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 vertically connected to the second surface of the second horizontal plate 500 , and the second end of the second vertical plate 501 is connected to the second outlet end of the cyclotron 1 .

[0140] The second connecting frame 50 also includes a second reinforcing plate 502, which is triangular in shape and has a first surface 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 between the second horizontal plate 500 and the second vertical plate 501, ensures the overall stability of the second connecting frame 50, and ensures that the second driving assembly 5 drives the second ion source 3 to perform precise position adjustment during the position movement process.

[0142] In some specific embodiments, reference Figure 5B The first shaft sleeve 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 sleeved on the first ball screw 44 and connected to the first ball screw 44 .

[0144] The first fixing sleeve 481 is sleeved on the first nut sleeve 480 , and both ends of the first fixing sleeve 481 are respectively connected to the first side fixing members 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] The stability of the first ion source 2 during movement is improved, and the first driving component 4 is ensured to drive the first ion source 2 to perform precise position adjustment during position movement.

[0147] In some specific implementations, the second sleeve 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 sleeved on the second ball screw 54 and connected to the second ball screw 54 .

[0149] The second fixing sleeve 581 is sleeved on the second nut sleeve 580 , and two ends of the second fixing sleeve 581 are respectively connected to the second side fixing members 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] The stability of the second ion source 3 during movement is improved, and the second driving component 5 is ensured to drive the second ion source 3 to accurately adjust its position during the movement process.

[0152] It should be noted that the channel in the cyclotron 1 for accommodating the first ion source 2 and the second ion source 3 can limit the first ion source 2 and the second ion source 3 from rotating along the first transmission shaft 42 and the second transmission shaft 52, and only allows the first ion source 2 and the second ion source 3 to move in a straight line.

[0153] See attached Figure 8 As shown, this embodiment also provides an accelerator maximum current intensity automatic search method, which is applied to the above-mentioned accelerator maximum current intensity automatic search system, and the method includes: steps S1-S6.

[0154] Step S1: Setting a preset step length, wherein the setting of the preset step length is related to the control accuracy of the first drive component 4 and the second drive component 5.

[0155] Step S2: Control the first driving component 4 to drive the first ion source 2 to move from the first initial position to the first maximum target position, and the second driving component 5 to drive the second ion source 3 to move from the second initial position to the second maximum target position according to the preset step length. The control can be synchronous control or asynchronous control. The position diagram of the first ion source 2 and the second ion source 3 is shown in FIG. Figure 6 shown.

[0156] Step S3: Record all first positions of the first ion source 2 during the process of moving from the first initial position to the first maximum target position, and all second positions of the second ion source 3 during the process of moving from the second initial position to the second maximum target position, and combine each first position with each second position to obtain all position combinations. The recording may be synchronous or asynchronous.

[0157] Step S4: controlling the cyclotron 1 to emit beams at each position combination, 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.

[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 table.

[0159] Step S6: Search for the maximum beam intensity from the data set, the maximum beam intensity corresponds to the best position combination, the best position combination includes the corresponding best first position of the first ion source 2 and the best second position of the second ion source 3. Optionally, the maximum beam intensity can be searched in an Excel table using a vlookup function in conjunction with a max function or a min function.

[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 larger 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, the first driving component 4 is controlled to drive the first ion source 2 to move from the first initial position to the first preset position, and the second driving component 5 is controlled to drive the second ion source 3 to move from the second initial position to the second preset position.

[0162] All first positions of the first ion source 2 in the process of moving from the first initial position to the first preset position and all second positions of the second ion source 3 in the process of moving from the second initial position to the second preset position are recorded respectively, and each first position is combined with each second position to obtain all first position combinations.

[0163] The cyclotron 1 is controlled to emit beams in each first position combination, 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.

[0164] A first beam intensity corresponding to each first position combination is obtained, and each first beam intensity is stored to form a first data set including all first beam intensities.

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

[0166] An optimal first position combination corresponding to the maximum first beam current intensity is obtained, where the optimal first 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 .

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

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

[0169] The cyclotron 1 is controlled to emit beams at each second position combination, 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.

[0170] The second beam intensity corresponding to each second position combination is acquired, and each second beam intensity is stored to form a second data set including all second beam intensities.

[0171] The maximum second beam intensity is searched out from the second data set.

[0172] An optimal second position combination corresponding to the maximum second beam current intensity is obtained, where the optimal second position combination includes the corresponding optimal third position of the first ion source 2 and the optimal fourth position of the second ion source 3 .

[0173] In some embodiments, 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.

[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 is related to the debugging requirements.

[0175] In this embodiment, as a preference, the third preset position is the first maximum target position, and the fourth preset position is the second maximum target position, wherein the first initial position and the first maximum target position are the limit positions to which the first ion source 2 can move, and the second initial position and the second maximum target position are the limit positions to which the second ion source 3 can move. The position diagram of the first ion source 2 and the second ion source 3 in this embodiment is shown in FIG. Figure 7 shown.

[0176] When the protons generated by the beams of the first ion source 2 and the second ion source 3 enter the Faraday cup electrometer, a beam current will be generated. The corresponding 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 the first positions, the second positions and the first beam intensity in the coarse adjustment stage in this embodiment.

[0178] Table 1

[0179]

[0180] It can be seen from Table 1 that the beam current of the maximum first beam intensity is 0.400 nA, the best first position of the first ion source 2 is 0.175 feet, the best second position of the second ion source 3 is 0.155 feet, and the best first position combination is (0.175, 0.155).

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

[0182] Table 2

[0183]

[0184] It can be seen from Table 2 that the beam current of the maximum second beam intensity is 0.420 nA, the best third position of the first ion source 2 is 0.170 feet, the best fourth position of the second ion source 3 is 0.155 feet, and the best second position combination is (0.170, 0.155).

[0185] Combining Table 1 and Table 2, it can be seen that, compared with manual adjustment, remote automatic adjustment of the ion source position can be achieved only through the coarse adjustment stage, the beam current corresponding to the maximum first beam intensity is searched, and the best first beam position is obtained relatively quickly, so as to obtain a relatively accurate best first position of the first ion source 2 and the best second position of the second ion source 3, thereby avoiding radiation of the debugging personnel and improving the debugging efficiency and accuracy. However, there are the following problems: if the coarse adjustment step size is too large, the beam current corresponding to the maximum first beam intensity obtained is not accurate, which leads to the inaccurate best first position of the first ion source 2 and the best second position of the second ion source 3, affecting the debugging accuracy; if the coarse adjustment step size is too small, the amount of debugging data will increase dramatically, which will greatly increase the number of debugging times and affect the beam debugging efficiency, which makes it impossible to balance the debugging efficiency and accuracy.

[0186] By setting the fine-tuning stage after the coarse-tuning stage, the coarse-tuning stage can reduce the amount of debugging data, narrow the search range of the maximum beam intensity, reduce the number of debugging times, improve the beam debugging efficiency, and can quickly search for the beam current corresponding to the maximum first beam intensity to obtain the best first position combination, thereby obtaining the best first position of the first ion source 2 and the best second position of the second ion source 3; through the fine-tuning stage, on the basis of the best first position combination, the beam current corresponding to the maximum second beam intensity can be searched more accurately to obtain the best second position combination, and the best third position of the first ion source 2 and the best fourth position of the second ion source 3 can be found accurately and quickly, thereby improving the debugging accuracy, taking into account both the debugging efficiency and the accuracy, and further improving the debugging efficiency and the accuracy compared to only going through the coarse-tuning stage.

[0187] In order to further improve the search accuracy of the 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. The first preset step size> the second preset step size> the third preset step size> the Nth preset step size.

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

[0189] The above-mentioned accelerator maximum current intensity automatic search system and method improves the debugging efficiency and accuracy, which is conducive to shortening the treatment time when using proton beam to treat patient tumors in the future, ensuring better radiotherapy effects, and making proton therapy more popular more quickly.

[0190] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, substitute and modify the above embodiments within the scope of the invention without departing from the principles and purpose of the present invention. All such changes should fall within the scope of protection of the claims of the present invention.

Claims

1. An accelerator maximum current intensity automatic search system, characterized in that: include: A cyclotron accelerator (1) comprises a first outlet end and a second outlet end which are arranged opposite to each other along a length direction, and are used to accommodate a first ion source (2) and a second ion source (3) which are arranged opposite to each other along the length direction; the first ion source (2) can be moved away from the second ion source (3) along an axial direction; and the second ion source (3) can be moved away from the first ion source (2) along an axial direction. A recording module (6) for recording all first positions of the first ion source (2) and all second positions of the second ion source (3), and combining each first position with each second position to obtain all position combinations; A debugging module (7) is used to set a preset step length, and to control the first ion source (2) and the second ion source (3) to move in position according to the preset step length; The debugging module is used to 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); A storage module (8) is used to obtain the beam intensity corresponding to each position combination, store each beam intensity, and form a data set including all beam intensities; A search module (9) is used to search for the maximum beam intensity from the data set.

2. The accelerator maximum current intensity automatic search system according to claim 1, characterized in that: Also includes: A first driving component (4), wherein a fixed end of the first driving component (4) is connected to a first outlet end of the cyclotron (1), and a driving end of the first driving component (4) is connected to a first ion source (2) for driving the first ion source (2) to move axially away from the second ion source (3); a second driving assembly (5), wherein a fixed end of the second driving assembly (5) is connected to a second outlet end of the cyclotron (1), and a driving end of the second driving assembly (5) is connected to a second ion source (3) for driving the second ion source (3) to move axially away from the first ion source (2); The debugging module (7) also controls the first driving component (4) to drive the first ion source (2) to move according to the preset step length, and the second driving component (5) to drive the second ion source (3) to move according to the preset step length; the recording module (6) is also used to connect to the first driving component (4) and the second driving component (5), respectively.

3. The accelerator maximum current intensity automatic search system 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 is provided between a first initial position of the first ion source (2) and a second initial position of the second ion source (3), and the minimum installation gap is 0.508 mm; and / or, a position movement distance of the first ion source (2) from the first initial position to the first maximum target position and a position movement distance of the second ion source (3) from the second initial position to the second maximum target position are both less than 1 mm; and / or, the maximum beam intensity corresponds to an optimal position combination, and the optimal position combination includes a corresponding optimal first position of the first ion source (2) and an optimal second position of the second ion source (3).

4. The accelerator maximum current intensity automatic search system according to claim 2, characterized in that: The first driving assembly (4) comprises: A first connecting frame (40) having a first end and a second end opposite to each other; A first servo motor (41) having a fixed end and a driving end, wherein the fixed end of the first servo motor (41) is connected to a first end of the first connecting frame (40); A first transmission shaft (42) having a first end and a second end opposite to each other, wherein the first end of the first transmission shaft (42) and the driving end of the first servo motor (41) are connected via a first coupling (43); A first ball screw (44) having a first end and a second end opposite to each other, wherein the first end of the first ball screw (44) and the second end of the first transmission shaft (42) are connected via a second coupling (45); A first bearing seat (46) is arranged on the first connecting frame (40) and is 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); a second bearing seat (47) 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); a first sleeve assembly (48), sleeved on the first ball screw (44) and connected to the first ball screw (44), and located between the first bearing seat (46) and the second bearing seat (47), the first sleeve assembly (48) being connected to the first ion source (2); and / or the second driving assembly (5) comprising: A second connecting frame (50) having a first end and a second end opposite to each other; A second servo motor (51) having a fixed end and a driving end, wherein the fixed end of the second servo motor (51) is connected to the first end of the second connecting frame (50); A second transmission shaft (52) having a first end and a second end opposite to each other, wherein the first end of the second transmission shaft (52) and the driving end of the second servo motor (51) are connected via a third coupling (53); a second ball screw (54) having a first end and a second end opposite to each other, wherein the first end of the second ball screw (54) and the second end of the second transmission shaft (52) are connected via a fourth coupling (55); a third bearing seat (56) 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); a fourth bearing seat (57) 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); A second shaft sleeve 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 shaft sleeve assembly (58) is connected to the second ion source (3).

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

6. A method for automatically searching for the maximum current intensity of an accelerator, characterized in that: The method applied to the accelerator maximum current automatic search system according to any one of claims 1 to 5 comprises: Setting the preset step length; According to the preset step length, the first ion source (2) is controlled to move from a first initial position to a first maximum target position, and the second ion source (3) is controlled to move from a second initial position to a second maximum target position; Respectively record all first positions of the first ion source (2) during the process of moving from the first initial position to the first maximum target position, and all second positions of the second ion source (3) during the process of moving from the second initial position to the second maximum target position, and combine each first position with each second position to obtain all position combinations; Controlling the cyclotron (1) to emit beams at each position combination, so that the cyclotron (1) simultaneously and sequentially introduces, accelerates and extracts protons generated by the first ion source (2) and the second ion source (3); Acquire the beam intensity corresponding to each of the position combinations, store each of the beam intensity, and form a data set including all beam intensities; The maximum beam intensity is searched out from the data set.

7. The method for automatically searching for the maximum current intensity of an accelerator according to claim 6, 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, 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).

8. The method for automatically searching for the maximum current intensity of an accelerator according to claim 6, characterized in that: The preset step size includes a coarse adjustment step size and a fine adjustment step size, the coarse adjustment step size is larger than the fine adjustment step size, and the method includes: Coarse adjustment stage: controlling the first ion source (2) to move from a first initial position to a first preset position and the second ion source (3) to move from a second initial position to a second preset position according to the coarse adjustment step length; Recording all first positions of the first ion source (2) during the process of moving from the first initial position to the first preset position, and all second positions of the second ion source (3) during the process of moving from the second initial position to the second preset position, respectively, and combining each first position with each second position to obtain all first position combinations; Controlling the cyclotron (1) to emit beams at each first position combination, so that the cyclotron (1) simultaneously and sequentially introduces, accelerates and extracts protons generated by the first ion source (2) and the second ion source (3); Acquire a 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; Searching for a maximum first beam intensity from the first data set; Acquire an optimal first position combination corresponding to the maximum first beam current intensity, the optimal first position combination comprising the corresponding optimal first position of the first ion source (2) and the optimal second position of the second ion source (3); Fine-tuning stage: controlling the first ion source (2) to move from the optimal first position to a third preset position and the second ion source (3) to move from the optimal second position to a fourth preset position according to the fine-tuning step length; Recording all third positions of the first ion source (2) during the process of moving from the optimal first position to the third preset position, and all fourth positions of the second ion source (3) during the process of moving from the optimal second position to the fourth preset position, and combining each third position with each fourth position to obtain all second position combinations; Controlling the cyclotron (1) to emit beams at each second position combination, so that the cyclotron (1) simultaneously and sequentially introduces, accelerates and extracts protons generated by the first ion source (2) and the second ion source (3); Acquire a 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; Searching for a maximum second beam intensity from the second data set; An optimal second position combination corresponding to the maximum second beam current intensity is obtained, wherein the optimal second position combination includes the corresponding optimal third position of the first ion source (2) and the optimal fourth position of the second ion source (3).

9. The method for automatically searching for the maximum current intensity of an accelerator according to claim 8, characterized in that: The preset step length includes a first step length, a second step length, ..., an Nth step length, wherein the first step length > the second step length > ... > the Nth step length; 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.

10. A radiotherapy device, characterized in that: The radiotherapy equipment comprises the accelerator maximum current intensity automatic search system as described in any one of claims 1-5, and the accelerator maximum current intensity automatic search system applies the accelerator maximum current intensity automatic search method as described in any one of claims 6-9.

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