Beam detection device and beam detection method

Abstract

The invention discloses a beam detection device and a beam detection method, and the device comprises a detection element and a drive element. The detection element is used for being in contact with a beam to detect beam information; the driving element comprises an extension rod assembly extending along the beam extraction channel and a driving piece connected with the extension rod assembly, the driving piece is arranged on the outer side of an accelerator used for generating beams, and one end of the extension rod assembly is connected with the detection element and can drive the detection element to move; wherein the driving part can indirectly drive the detection element to move along the beam radius direction in a vacant area of the accelerator through the extension rod assembly without touching other elements of the accelerator, and the detection element can only be in contact with an acceleration area and a leading-out area of the beam. According to the beam detection device and the beam detection method, beam information in a larger range can be detected more safely, efficiently and accurately.

Description

Technical Field

[0001] The present invention relates to the technical field of synchrocyclotron accelerators, and in particular to a particle beam detection device and a particle beam detection method. Background Art

[0002] Various existing particle accelerators such as scientific research laboratory accelerators, medical accelerator equipment, industrial irradiation accelerators, etc. will generate particle beams when working. Whether the beam path is accurate is one of the key factors affecting the performance of the accelerator. Therefore, the accelerator will perform beam injection and extraction debugging before operation. Existing devices for assisting beam injection and extraction debugging generally use beam detection devices, such as fluorescent targets as beam detection devices. When the fluorescent target is irradiated by the beam generated by the accelerator, a light spot is generated. By observing the shape and position of the light spot, it is possible to determine whether the beam path is accurate and assist in the injection and extraction debugging of the beam.

[0003] The existing fluorescent target includes a fluorescent target assembly that can produce a light spot under the irradiation of the accelerator beam, a motor that drives the fluorescent target assembly to move, and other components. The motor drives the fluorescent target assembly to move so that the fluorescent target can obtain information about the beam within a certain range. The fluorescent target assembly and the motor are generally arranged inside the accelerator, and the fluorescent target assembly is generally arranged at a distance of tens of centimeters from the center of the accelerator. The motor can generally only drive the fluorescent target assembly to move a few centimeters along the radius of the accelerator. Therefore, the fluorescent target can only obtain information about the beam within a small range. Summary of the invention

[0004] The object of the present invention is to provide a beam detection device and a beam detection method for a synchrocyclotron accelerator, which are used to detect the beam in a wider range.

[0005] The purpose of the present invention is achieved by the following technical solutions:

[0006] A beam detection device, comprising:

[0007] A detection element is used to contact the beam to detect beam information; the detection element is provided with a front detection surface, which is arranged to intersect with the beam moving direction and is larger than the area occupied by two adjacent beam spots of different beams at the first position and two adjacent beam spots at the second position, and is used to achieve simultaneous contact with multiple beams spaced apart from each other along the radial direction of the accelerator and different parts of the same beam spaced apart by a certain distance along the radial direction of the accelerator, and the front detection surface extends to cover the first position and the second position;

[0008] A driving element, comprising an extension rod assembly extending along a beam extraction channel and a driving member connected to the extension rod assembly, wherein the driving member is arranged outside an accelerator for generating a beam, one end of the extension rod assembly is connected to the detection element and can drive the detection element to move; one end of the extension rod assembly extending to the inside of the accelerator along a first direction is spaced from the beam, one end of the extension rod assembly used for connecting to the detection element is connected to a connecting rod perpendicular to or parallel to a long straight side of a D-shaped member of the accelerator, and the connecting rod extends along a second direction;

[0009] The driving member can indirectly drive the detection element to move along the beam radius direction in the vacant area of ​​the accelerator through the extension rod assembly without touching other elements of the accelerator, and the detection element can only contact the acceleration area and the extraction area of ​​the beam. Along the extension direction of the ion source, that is, in the direction perpendicular to the semicircular surface of the D-shaped member, the projection of the detection element does not overlap with the projections of other elements in the accelerator.

[0010] Preferably, it also includes a vacuum retaining member, which is hollow inside and forms a vacuum connecting cavity located outside the accelerator and capable of communicating with the inside of the accelerator; one end of the extension rod assembly used for connecting with the detection element passes through the vacuum connecting cavity and extends into the accelerator.

[0011] Preferably, it further comprises an image receiving element; the detection element is a fluorescent target component, and the detection element can receive a beam to generate a beam spot image corresponding to the beam; the image receiving element is used to obtain the beam spot image generated by the detection element;

[0012] And / or, the accelerator is a synchrocyclotron accelerator.

[0013] Preferably, the vacuum retaining member is provided with a flange for sealing the vacuum connecting cavity, the flange is provided with an observation window, the image receiving element is arranged at an end of the flange away from the vacuum connecting cavity and obtains the beam spot image generated by the detection element through the observation window.

[0014] Preferably, it further comprises an adjustment component, the adjustment component is connected to the image receiving element and is used to adjust the position of the image receiving element;

[0015] And / or, it also includes a display module, which is connected to the image receiving element and is used to generate image information of the beam spot image acquired by the image receiving element.

[0016] Preferably, the driving element further comprises a limiter, and the limiter limits the path range of the driving element driving the detection element to move;

[0017] And / or, the driving element is further connected to a position detecting element, and the position detecting element detects the displacement of the detecting element driven by the driving element.

[0018] Preferably, it further comprises a plurality of support members, wherein the plurality of support members are arranged at intervals along the extension direction of the extension rod assembly, and the support members are used to support the extension rod assembly;

[0019] And / or, the extension rod assembly includes a screw connected to the driving member, a screw nut connected to the screw, and an extension rod connected to the screw nut, and one end of the extension rod facing away from the screw nut is connected to the detection element.

[0020] A beam detection method, comprising:

[0021] A beam detection device according to any one of the above is provided, wherein a driving element of the beam detection device drives the detection element to move into the accelerator and locate at an initial position, wherein the initial position is not located at a position where gas is injected into the center of the accelerator;

[0022] The accelerator generates a beam, and the beam contacts the detection element so that the detection element generates beam information corresponding to the beam;

[0023] The driving element drives the detection element to move along a first direction, so that the detection element can continuously measure beam information between an initial position and a second position; the second position is located in a beam extraction area; the initial position is located in an area where the gas begins to accelerate after being ionized into protons; the first direction is perpendicular to the direction in which the gas is injected into the center of the accelerator;

[0024] The beam quality is determined by the beam information detected by the detection element.

[0025] Preferably, the “driving element of the beam detection device drives the detection element to move into the accelerator and locate at the initial position” includes:

[0026] A vacuum holder is arranged outside the accelerator, the vacuum holder forms a vacuum connection cavity communicated with the inside of the accelerator, and the driving element drives the detection element to pass through the vacuum connection cavity and extend to the inside of the accelerator;

[0027] The beam detection method further includes:

[0028] The vacuum holding member is opened to allow the vacuum connection chamber to communicate with the outside world, and the driving element drives the detection element to move out of the vacuum holding member to the outside world to adjust or disassemble the detection element.

[0029] Preferably, the “driving element of the beam detection device drives the detection element to move into the accelerator and locate at the initial position” includes:

[0030] A position detection element is provided in the driving element, and the position detection element detects the displacement of the detection element driven by the driving element; when the driving element drives the detection element to move to an initial position, the position detection element is recorded as zero position.

[0031] Preferably, the “driving element drives the detecting element to move along the first direction” includes:

[0032] The driving element drives the detection element to move between an initial position and a second position, wherein the initial position is located in an area of ​​the beam acceleration zone adjacent to the center of the accelerator, and the second position is located on an extraction path of the beam extraction zone, and the beam is extracted from the accelerator after passing through the second position.

[0033] Preferably, the detection element contacts the beam and generates a beam spot image corresponding to the beam;

[0034] The “determining the beam quality by the beam information detected by the detection element” includes:

[0035] Providing an image receiving element, wherein the image receiving element acquires the beam spot image generated by the detection element;

[0036] A display module is provided, which is connected to the image receiving element and is used to generate image information of the beam spot image acquired by the image receiving element, and the beam quality is judged according to the image information generated by the display module.

[0037] Preferably, the “judging the beam quality according to the image information generated by the display module” includes:

[0038] When the accelerator emits a beam for the first time, judging whether the accelerator emits a beam normally according to a plurality of beam current information generated during the movement of the detection element from the initial position to the second position;

[0039] and / or, moving the detection element to a desired measurement position, and judging the quality of the beam at the desired position by using the beam information detected by the detection element;

[0040] And / or, when the accelerator beam fails, the detection element is moved from the second position toward the initial position, and beam information of the beam at multiple positions is detected to analyze the cause of the accelerator beam failure.

[0041] Preferably, the “when the accelerator emits a beam for the first time, judging whether the accelerator emits a beam normally according to a plurality of beam flow information generated during the movement of the detection element from the initial position to the second position” includes:

[0042] It is detected whether the detection element generates a beam spot image and / or whether the brightness of the beam spot image decreases at a plurality of positions from the initial position to the second position. If the detection element does not generate a beam spot image or the brightness of the beam spot image decreases at at least one of the plurality of positions from the initial position to the second position, it is determined that the accelerator does not emit beams normally. If the detection element generates beam spot images at each of the plurality of positions from the initial position to the second position and the brightness of the beam spot image does not decrease, it is determined that the accelerator emits beams normally.

[0043] Preferably, the “judging the quality of the beam at the desired position by using the beam information detected by the detection element” includes:

[0044] The beam quality is determined by at least one of the position of the beam spot image detected by the detection element in the detection element, the beam spot brightness, the beam spot shape and the beam spot distribution;

[0045] And / or, the “when the accelerator beam fails, moving the detection element from the second position toward the initial position, and detecting beam information at multiple positions to analyze the cause of the accelerator beam failure” includes:

[0046] The cause of accelerator beam failure is analyzed by detecting at least one of the position of beam spot images at multiple positions of the beam in the detection element, the beam spot brightness, the beam spot shape and the beam spot distribution.

[0047] Compared with the prior art, the beneficial effects of the present invention include at least:

[0048] By arranging the driving element outside the accelerator, the driving element can be free from the limitation of the internal space of the accelerator, and the driving element can have a larger driving length, so that the driving element can drive the detection element to move over a larger range in the control area inside the accelerator, thereby realizing the detection of the beam acceleration area and the extraction area, and thus realizing comprehensive, efficient and uninterrupted detection of a large range of beam areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 is a schematic diagram of the structure of a beam detection device and an accelerator according to an embodiment of the present invention;

[0050] Figure 2 It is a schematic diagram of the structure of a beam detection device and a part of the beam in the extraction area according to an embodiment of the present invention;

[0051] Figure 3 is a schematic structural diagram of a part of the accelerator and the detection elements of the beam detection device according to an embodiment of the present invention when they are located at the initial position;

[0052] Figure 4 is a schematic diagram of the structure of a part of the accelerator and the detection element of the beam detection device of the embodiment of the present invention when it is located at the second position

[0053] Figure 5 is a partial structural schematic diagram of a beam detection device according to an embodiment of the present invention;

[0054] Figure 6 is another partial structural schematic diagram of the beam detection device according to an embodiment of the present invention;

[0055] Figure 7 is a schematic structural diagram of a D-shaped member of a synchronous cyclotron accelerator according to an embodiment of the present invention;

[0056] Figure 8 It is a schematic diagram of beam spots at multiple positions of multiple beams that can contact the front end detection surface of the detection element in an embodiment of the present invention.

[0057] In the figure: 100, accelerator; 101, D-shaped part; 102, beam; 103, long straight edge; 104, semicircular surface; 105, first position; 106, second position; 107, beam spot; 1, detection element; 2, driving element; 21, extension rod assembly; 211, connecting rod; 212, lead screw; 213, lead screw nut; 214, extension rod; 215, lateral seal; 22, support member; 23, driving member; 25, mounting bracket; 3, vacuum holding member; 31, vacuum connecting chamber; 32, observation window; 33, flange; 4, image receiving element; 41, adjustment assembly; 411, mounting sleeve; 412, fixing plate. DETAILED DESCRIPTION

[0058] 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.

[0059] 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.

[0060] like Figures 1 to 4As shown, the present invention provides a beam detection device for detecting a beam 102 generated by an accelerator 100. The beam detection device includes a detection element 1 for detecting the beam 102, a driving element 2 for driving the detection element 1 to move, and may also include a vacuum holder 3. The accelerator 100 is a device for generating the beam 102. The accelerator 100 includes a beam generating device, which is used to generate the beam 102. The beam generating device may specifically include an ion source. The beam detection device is used to detect the beam generated by the beam generating device. The accelerator 100 may be any one of a scientific research laboratory accelerator, a medical accelerator device, an industrial irradiation accelerator, and the like. Specifically, in this embodiment, the accelerator 100 may be a synchrocyclotron proton accelerator in a medical accelerator device. The beam 102 generated by the accelerator 100 may be a proton beam, and the beam 102 is spiral.

[0061] The detection element 1 can be accommodated inside the accelerator 100. For example, one end of the detection element 1 for detecting information of the beam 102 is accommodated in an empty area inside the accelerator 100, and the detection element 1 can contact the beam 102 to generate test information corresponding to the beam 102. The empty area of ​​the accelerator 100 is a cavity reserved by the accelerator 100 itself, and the beam generated by the accelerator 100 partially passes through the empty area. In the prior art, the empty area of ​​the accelerator 100 needs to be installed with magnetic poles, motors, and fluorescent target assemblies, and the motor drives the fluorescent target assembly to move. The present application sets the empty area as the moving space of the detection element 1, so that the detection element 1 can be moved in a large range along the beam radius direction on one side of the D-shaped piece 101 without any obstacles, that is, without interfering with the internal parts of the accelerator 100. Specifically, the detection element 1 can move from the acceleration area close to the center of the beam to the extraction area far from the center of the beam, thereby realizing safer detection of the beam acceleration area and the extraction area. When the beam is detected, the beam generator is disposed on one side of the detection element 1, and the detection element 1 is spaced apart from the beam generator along a moving direction perpendicular to the detection element 1. The D-shaped member 101 is used to accelerate the beam 102 generated by the accelerator 100. Figure 7 As shown, the D-shaped member 101 includes a pair of semicircular surfaces 104 spaced apart in the thickness direction, and the beam 102 can be accelerated when passing through the space between the semicircular surfaces 104. The edges of the semicircular surfaces 104 all have long straight edges 103.

[0062] In this embodiment, the beam 102 does not need to be introduced, that is, there is no place where the beam is introduced, and there is no beam center area or injection area set in the prior art. Therefore, it is not necessary to measure the place where the beam 102 is introduced, that is, the introduction area, so that the measurement of the beam 102 is more efficient. The detection element 1 in this embodiment is only in contact with the acceleration area and the extraction area of ​​the beam 102, and the beam detection efficiency is relatively high; and along the extension direction of the ion source, that is, in the direction perpendicular to the semicircular surface 104 of the D-shaped piece 101, the projection of the detection element 1 does not overlap with the projections of other elements inside the accelerator 100, for example, the projection of the detection element 1 does not overlap with the projections of the ion source, the D-shaped piece 101 and other components inside the accelerator 100, so as to avoid the collision of the detection element 1 with other elements inside the accelerator 100, so that the detection is faster and safer.

[0063] Reference Figure 2 In some specific embodiments, the detection element 1 can be a fluorescent target component, the detection element 1 can be completely contained in the accelerator 100, and the detection element 1 can be set on the extension path of the beam 102, that is, the moving path, so that the detection element 1 can receive the beam 102 to generate a beam spot image corresponding to the beam 102; for example, the detection element 1 can interact with the particles in the beam 102 to generate visible light, or the detection element 1 and the particles in the beam 102 generate secondary particles during the interaction, and the secondary particles react with the fluorescent material in the detection element 1 to emit visible light, thereby enabling the detection element 1 to receive the beam 102 and generate a light spot corresponding to the beam 102, that is, a beam spot image.

[0064] Reference Figure 6 , the driving element 2 includes an extension rod assembly 21 and a driving member 23. The driving member 23 is disposed outside the accelerator 100, and the driving member 23 is used to drive the extension rod assembly 21 to move along the radial direction of the beam. One end of the extension rod assembly 21 can be connected to the driving member 23 located outside the accelerator 100, and the other end can be used to connect the detection element 1, so that the driving member 23 can drive the detection element 1 to move along the radial direction of the beam through the extension rod assembly 21. When it is necessary to move the detection element 1 inside the accelerator 100, the end of the extension rod assembly 21 connected to the detection element 1 can be extended into the accelerator 100, and the detection element 1 is driven by the driving member 23 located outside the accelerator 100 to move along the radial direction of the beam.

[0065] Since one end of the extension rod assembly 21 extending to the inside of the accelerator 100 along the first direction is spaced from the beam 102, at this time, one end of the extension rod assembly 21 used for connecting with the detection element 1 may be connected with a connecting rod 211, and the connecting rod 211 is perpendicular or parallel to the long straight side 103 of the D-shaped member 101 of the accelerator 100. The connecting rod 211 may extend along the second direction, and the end of the connecting rod 211 facing the beam 102 is connected to the detection element 1, so that the detection element 1 is located on the extension path of the beam 102 in the accelerator 100 and contacts the beam 102. The first direction and the second direction intersect, the first direction may be a direction from the driving member 23 toward the detection element 1 located in the accelerator 100, and the first direction may be parallel to the radial direction of the accelerator 100, and the second direction is a direction from the end of the connecting rod 211 extending into the accelerator 100 toward the detection element 1.

[0066] The driving element 2 may further include a mounting bracket 25 . The mounting bracket 25 is disposed outside the accelerator 100 and is fixed to the accelerator 100 . The driving member 23 is fixedly mounted to the mounting bracket 25 .

[0067] Reference Figure 5 Since the extension rod assembly 21 is long, the extension rod assembly 21 may bend due to its own weight, thereby causing the position of the detection element 1 connected to the extension rod assembly 21 to be offset. In order to support the extension rod assembly 21 so that the extension rod assembly 21 maintains a straight extension state, the extension rod assembly 21 is connected with a plurality of support members 22. The plurality of support members 22 are arranged at intervals along the extension direction of the extension rod assembly 21 and apply support forces to different positions of the extension rod assembly 21, thereby partially or completely offsetting the gravity of the extension rod assembly 21 itself. Among them, the support members 22 can be installed on a component fixed to the accelerator 100, for example, a part of the support members 22 is installed on the mounting bracket 25 of the driving element 2, and a part of the support members 22 is installed on other components fixed to the accelerator 100, so that the position of the support members 22 remains fixed. The support members 22 are also provided with a receiving groove for the extension rod assembly 21 to pass through, and a part of the support members 22 is arranged in the receiving groove and abuts against the wall forming the receiving groove, so that the support members 22 can support the extension rod assembly 21.

[0068] In some specific embodiments, the extension rod assembly 21 may specifically include a screw 212, a screw nut 213 connected to the screw 212, and an extension rod 214 connected to the screw nut 213. The screw 212 may be connected to the drive member 23, and the screw 212 may rotate under the drive of the drive member 23. The screw nut 213 is threadedly engaged with the screw 212 and converts the rotation of the screw 212 into linear motion, for example, into linear motion along the beam radius. The extension rod 214 is connected to the screw nut 213 and moves synchronously with the screw nut 213, so that the extension rod 214 can move along the beam radius; the end of the extension rod 214 away from the screw nut 213 is connected to the detection element 1, so that the detection element 1 can move synchronously with the extension rod 214 along the beam radius.

[0069] In the existing beam detection device, the detection element and the motor are both arranged in the accelerator 100. Due to the limitation of the internal installation space of the accelerator 100, the installation position of the motor and the detection element in the accelerator 100 is limited, and the volume of the motor also needs to be set to a small volume structure. In the existing beam detection device, the motor can only drive the detection element to move about 4 cm. In addition, since the accelerator 100 is generally in a strong magnetic environment when the accelerator 100 generates the beam 102, the existing method of setting the motor in the accelerator 100 requires the use of a motor that can resist strong magnetism, and the cost of the motor is relatively high. In the present application, by setting the driving member 23 outside the accelerator 100, the driving member 23 does not need to occupy the space inside the accelerator 100, and is not limited by the internal space of the accelerator 100. The volume of the driving member 23 can be selected as a large volume or a small volume structure as needed, and the driving element 2 does not need to use a component that resists strong magnetism, which can reduce the cost of the driving element 2.

[0070] The detection element 1 and the driving member 23 are connected by the extension rod assembly 21, so that the detection element 1 can move in a wider range under the drive of the driving member 23. In the beam detection device of the present invention, the detection element 1 can move between the center position of the accelerator 100, that is, the position close to the center position of the beam, and the edge position of the accelerator 100 under the action of the driving element 2, so that the detection element 1 can detect the acceleration area and the extraction area of ​​the beam; specifically, the detection element 1 can move between the first distance from the center position of the accelerator 100 and the second distance from the center position of the accelerator 100 under the action of the driving element 2. The first distance from the center position of the accelerator 100 can be the starting position of the beam acceleration area or the starting position adjacent to the beam acceleration area; the second distance from the center position of the accelerator 100 can be the position of the beam extraction area that finally extracts the accelerator 100. The difference between the second distance and the first distance is greater than the moving range of the detection element in the prior art, so as to realize uninterrupted detection of a larger range of the beam.

[0071] Reference Figure 2 and Figure 5 In some specific embodiments, the vacuum holder 3 is hollow inside and is formed in a vacuum connection chamber 31. The vacuum connection chamber 31 is located outside the accelerator 100 and can be connected to the internal space of the accelerator 100. For example, an opening is provided at one end of the accelerator 100, and the vacuum holder 3 is provided at the opening of the accelerator 100, so that the vacuum connection chamber 31 of the vacuum holder 3 can be connected to the inside of the accelerator 100. The vacuum connection chamber 31 can be connected to the accelerator 100 and form a sealed space. When the accelerator 100 is working, the vacuum connection chamber 31 is a vacuum chamber, and the internal space of the accelerator 100 is in a vacuum state. In addition, the vacuum holder 3 can be fixedly connected to the mounting bracket 25 of the driving element 2, so that the mounting bracket 25 is fixed to the accelerator 100. The vacuum holder 3 can be a vacuum pipe.

[0072] One end of the extension rod assembly 21 connected to the detection element 1 can pass through the vacuum connection cavity 31 of the vacuum holder 3 and then extend to the inside of the accelerator 100. In addition, the detection element 1 can be moved out of the accelerator 100 under the drive of the driving member 23, specifically, moved out of the vacuum connection cavity 31 of the vacuum holder 3. Therefore, when it is necessary to disassemble and assemble the detection element 1, the driving element 2 can drive the detection element 1 to move outside the vacuum connection cavity 31 of the vacuum holder 3 through the extension rod assembly 21 to disassemble and assemble the detection element 1. In order to facilitate the movement of the detection element 1 outside the vacuum connection cavity 31, the vacuum holder 3 may include a flange 33, and the flange 33 is used to block the vacuum connection cavity 31. When it is necessary to move the detection element 1 outside the vacuum connection cavity 31, the flange 33 can be removed so that the detection element 1 can be moved out of the vacuum connection cavity 31 from the part of the vacuum connection cavity 31 blocked by the flange 33. In addition, in order to seal the connection position of the extension rod assembly 21 with the vacuum retaining member 3, the extension rod assembly 21 can also be provided with a lateral seal 215. The lateral seal 215 is arranged on the outside of the vacuum retaining member 3 and seals the connection position between the extension rod assembly 21 and the vacuum retaining member 3 of the extension rod assembly 21 to improve the sealing performance of the vacuum retaining member 3.

[0073] Among them, since a part of the extension rod assembly 21 will be accommodated in the vacuum connecting cavity 31 of the vacuum retaining member 3, a certain number of support members 22 can be arranged in the vacuum connecting cavity 31 of the vacuum retaining member 3. The support members 22 are fixedly connected to the inner wall of the vacuum retaining member 3 and can be used to support the part of the extension rod assembly 21 or the detection element 1 accommodated in the vacuum connecting cavity 31.

[0074] In the existing beam detection device, the motor and the fluorescent target assembly are both installed inside the accelerator 100. Therefore, when the fluorescent target assembly needs to be disassembled or debugged, the accelerator 100 needs to be opened. The opening steps of the accelerator 100 are relatively complicated and radiation may be generated after the accelerator 100 is opened, which pollutes the surrounding environment. The present invention provides a vacuum holder 3 with a flange 33, so that the detection element 1 can be moved to the outside of the vacuum connection chamber 31 under the action of the driving element 2 for disassembly or debugging without opening the accelerator 100, which can simplify the disassembly steps of the detection element 1 and avoid the influence of the radiation generated when the accelerator 100 is opened on personnel and the surrounding environment.

[0075] In some specific embodiments, in order to limit the moving path of the detection element 1, the driving element 2 may include a limiter. Two limiters may be provided. The limiter may be located on the extension path of the extension rod assembly 21. When the detection element 1 moves to the inside of the accelerator 100 and is located at the initial position, the extension rod assembly 21 abuts against one limiter, and the limiter limits the further movement of the extension rod assembly 21; when the detection element 1 moves out of the vacuum holder 3, the extension rod assembly 21 abuts against another limiter, and the limiter limits the further movement of the extension rod assembly 21. Among them, the limiter may be a limit block, and the initial position of the detection element 1 may be the starting point for detecting the beam acceleration zone, for example, at the first distance from the center position of the beam along the beam radius direction. The detection element 1 moves out of the vacuum holder 3 at the third distance from the center position of the beam along the beam radius direction. The third distance is greater than the second distance, and the second distance is greater than the first distance.

[0076] To facilitate the position of the detection element 1, the driving element 2 can be connected to a position detection component. The position detection component can detect the displacement of the detection element 1 driven by the driving element 2. Specifically, when the detection element 1 is at the initial position, the position detection component can be recorded as zero position; when the detection element 1 moves from the initial position along the beam radius direction, the position detection component feeds back the displacement of the detection element 1 driven by the driving element 2 in real time, and then determines the position of the detection element 1. Among them, the position detection component can be specifically a potentiometer, and the position detection component is connected to the driving element 23.

[0077] Reference Figure 5In some specific embodiments, the beam detection device may further include an image receiving element 4, which may be disposed outside the vacuum holder 3 and the accelerator 100, and an observation window 32 is disposed at one end of the vacuum holder 3 facing the image receiving element 4. The image receiving element 4 may obtain the beam spot image generated by the detection element 1 through the observation window 32. By using the observation window 32, when the vacuum holder 3 and the accelerator 100 form a sealed structure, the image receiving element 4 located outside the vacuum holder 3 and the accelerator 100 may obtain the image information of the detection element 1 located inside the accelerator 100. The observation window 32 may be disposed on the flange 33, and the image receiving element 4 is disposed at one end of the flange 33 away from the vacuum connection chamber 31.

[0078] When the beam detection device is installed, due to installation tolerance and other reasons, the image receiving element 4 may be offset from the detection element 1, which may cause the image receiving element 4 to only partially or fail to obtain the beam spot image information generated by the detection element 1. In order to adjust the relative position between the image receiving element 4 and the detection element 1, the beam detection device may also include an adjustment component 41, which is connected to the image receiving element 4 to adjust the position of the image receiving element 4. Specifically, the adjustment component 41 can be used to adjust the position of the image receiving element 4 along the first direction and the second direction. The first direction, the second direction, and the axial direction of the adjustment component 41 are perpendicular to each other.

[0079] In some specific embodiments, the adjustment assembly 41 may include a mounting sleeve 411, a fixing plate 412, and an adjustment unit. The mounting sleeve 411 may be mounted on the image receiving element 4, and the mounting sleeve 411 may be connected to fasteners such as screws, and the screws connected to the mounting sleeve 411 may pass through the side wall of the mounting sleeve 411 and abut against the image receiving element 4, so that the image receiving element 4 is locked in the mounting sleeve 411. The fixing plate 412 may be fixedly mounted on the vacuum holder 3, for example, the fixing plate 412 is fixedly connected to the vacuum holder 3 by means of screws, clamps, integral molding, etc. The adjustment unit is used to adjust the relative position between the mounting sleeve 411 and the fixing plate 412 or the relative position between the mounting sleeve 411 and the image receiving element 4, thereby realizing the position adjustment of the image receiving element 4 locked in the mounting sleeve 411.

[0080] Among them, the adjustment unit can be a slider structure, so that the mounting sleeve 411 can slide along the first direction and the second direction relative to the fixed plate 412; or, the adjustment unit can also be a driving member such as a motor installed on the fixed plate 412 and capable of driving the mounting sleeve 411 to move along the first direction and the second direction, or, the adjustment unit can also be a plurality of screws threadedly connected to the mounting sleeve 411, and the mounting sleeve 411 and the image receiving element 4 are clearance-matched, and the plurality of screws extend through the outer wall of the mounting sleeve 411, and by adjusting the depth of the plurality of screws screwed into the mounting sleeve 411, the plurality of screws can lock the image receiving element 4 at different positions in the mounting sleeve 411, thereby realizing the position adjustment of the image receiving element 4; in addition, the adjustment unit can also adopt other structures that can adjust the relative position between the mounting sleeve 411 and the fixed plate 412 or the relative position between the mounting sleeve 411 and the image receiving element 4, which are not limited here.

[0081] The present invention also provides a beam current detection method, which can be applied to the above-mentioned beam current detection device. The beam current detection method includes step S01 and step S04, and may also include step S05.

[0082] Step S01: Provide a detection element 1 and a driving element 2, and the driving element 2 drives the detection element 1 to move from the beam extraction channel of the accelerator 100 to the accelerator 100 and locate it at an initial position. The initial position is not located at the center of the gas injection accelerator 100, and the initial position can be located in the area where the gas begins to accelerate after being ionized into protons.

[0083] Step S02 : the accelerator 100 generates the beam 102 , and the beam 102 contacts the detection element 1 so that the detection element 1 generates beam information corresponding to the beam.

[0084] Step S03: the driving element 2 drives the detection element 1 to move along the first direction, so that the detection element 1 continuously measures the beam information between the initial position and the second position 106, that is, the detection element 1 continuously measures the beam along the path of the beam radius. The second position 106 may be located at the extraction area of ​​the beam.

[0085] Step S04: judging the beam quality through the beam information detected by the detection element 1.

[0086] Step S05 : opening the vacuum holder 3 to allow the vacuum connection chamber 31 to communicate with the outside, and the driving element 2 drives the detection element 1 to move out of the vacuum holder 3 to the outside, so as to adjust or disassemble the detection element 1 .

[0087] Step S01 may specifically include: providing a vacuum holder 3 provided with a vacuum connection cavity 31, wherein the vacuum holder 3 is provided outside the accelerator 100 and the vacuum connection cavity 31 is connected to the inside of the accelerator 100. The driving element 2 may drive the detection element 1 to move, thereby allowing the detection element 1 to pass through the vacuum connection cavity 31 to move to the inside of the accelerator 100 connected to the vacuum connection cavity 31.

[0088] In addition, a position detection element may be provided in the driving element 2. When the detecting element 1 is driven by the driving element 2 and moves to the initial position, the position detection element may be recorded as zero position, for example, the position detection element may be zeroed. When the detecting element 1 moves, the position of the detecting element 1 is determined by the data detected by the position detection element.

[0089] In step S02, when the vacuum holder 3 is sealed, the accelerator 100 can enter the working state. At this time, the vacuum connection cavity 31 of the vacuum holder 3 can form a vacuum cavity, and the interior of the accelerator 100 is a vacuum strong magnetic environment, and the beam generating device in the accelerator 100 generates a beam 102. The beam 102 includes an acceleration zone and an extraction zone. The beam 102 gradually spirals outward along the acceleration zone and the extraction zone, and is extracted from the accelerator 100 from the extraction zone to complete the beam. Among them. In this embodiment, there is no injection zone for the beam 102, that is, the beam does not need to be injected but is directly generated at the center of the accelerator. In this embodiment, there is no need to perform beam detection on the injection zone, making the beam detection more efficient. The acceleration zone is the area where particles are accelerated, and the extraction zone is the area where particles complete acceleration to form a high-energy particle beam and are extracted toward the outside.

[0090] When the detection element contacts the beam, a beam spot image corresponding to the beam is generated, and the beam spot image serves as the beam information generated by the detection element.

[0091] In step S03, the driving element 2 drives the detecting element 1 to move between the initial position and the second position 106. Figure 3 , the initial position can be located on the path of the beam acceleration region, for example, in the part of the beam acceleration region near the center of the accelerator. Figure 4 , the second position 106 is located on the extraction path of the beam extraction area, and the beam is extracted from the accelerator 100 after passing through the second position 106 to complete the beam extraction. Among them, the acceleration area of ​​the beam is positively correlated with the area of ​​the beam adjacent to the center of the accelerator. By detecting the acceleration area, the beam situation in the area adjacent to the center of the accelerator can be reflected. Therefore, the initial position can be located on the path of the beam acceleration area, and the beam from the initial position to the second position 106 is the area where the beam needs to be detected. When the area where the beam needs to be detected is other areas, the initial position and the second position 106 of the beam can also be adjusted according to the area where the beam actually needs to be detected.

[0092] Reference Figure 8 , the detection element is provided with a front detection surface, which is arranged to intersect with the beam moving direction, and the area of ​​the front detection surface is larger than the area occupied by two adjacent beam spots 107 of different beams at the first position 105 and the area occupied by two adjacent beam spots 107 at the second position 106, so as to achieve simultaneous contact with multiple beams spaced apart from each other along the radial direction of the accelerator and different parts of the same beam spaced apart at a certain distance along the radial direction of the accelerator, and the front detection surface extends to cover the first position 105 and the second position 106. In this way, compared with the prior art, the detection element in this embodiment can contact multiple beams and parts of the same beam at different positions at multiple positions at the same time, so as to obtain beam information more efficiently and comprehensively, and facilitate more accurate judgment of the beam situation. The second position 106 is closer to the beam extraction channel than the first position 105.

[0093] Step S04 specifically includes: providing an image receiving element 4 , and the image receiving element 4 acquires the beam spot image generated by the detection element 1 .

[0094] A display module is provided, which is connected to the image receiving element 4 and used to generate image information of the beam spot image obtained by the image receiving element 4, and the beam quality is judged according to the image information generated by the display module. The display module includes a display screen, and the display module displays the image information through the display screen for easy observation by the staff.

[0095] When the accelerator emits a beam for the first time, it is necessary to ensure that the beam forms a continuous spiral path in the acceleration area and the extraction area and completes the beam emission from the accelerator 100. At this time, it is determined whether the accelerator emits a beam normally according to a plurality of beam information generated during the movement of the detection element 1 from the initial position to the second position 106. For example, it is detected whether the detection element 1 generates a beam spot image at a plurality of positions from the initial position to the second position 106 and whether the brightness of the beam spot image decreases. When the detection element 1 moves from the initial position to the second position 106, if the detection element 1 cannot generate a beam spot image in the corresponding area or the brightness of the beam spot image decreases, it is determined that the beam in the accelerator is abnormal and cannot emit a beam normally. Specifically, when the detection element 1 is located at the initial position, the display module is used to observe whether the detection element 1 generates a beam spot image at the initial position. If the detection element 1 generates a beam spot image at the initial position, the detection element 1 is driven to move toward the second position by the driving element 2. If the detection element 1 does not generate a beam spot image at the initial position, it is determined that the beam in the accelerator is abnormal and the accelerator 100 is adjusted so that the detection element 1 generates a beam spot image at the initial position. When the detection element 1 moves toward the second position, multiple positions of the beam are detected. When the detection element 1 generates beam spot images at multiple positions from the initial position to the second position and the brightness of the beam spot image does not decrease, it is determined that the beam outgoing path is correct. If at least one of the multiple positions of the detection element 1 from the initial position to the second position cannot generate a beam spot image or the brightness of at least one beam spot image decreases, it is determined that the accelerator beam outgoing is abnormal and the accelerator is adjusted so that the detection element 1 generates beam spot images at multiple positions from the initial position to the second position. When the detection element 1 moves to the second position, observe whether the detection element 1 generates a beam spot image and the relative position of the beam spot image on the detection element 1. If the detection element 1 does not generate a beam spot image or the position of the beam spot image on the detection element 1 is offset, the accelerator 100 is adjusted so that the detection element 1 generates a beam spot image and the position of the beam spot image on the detection element 1 is accurate, and a beam flow can be detected at the exit of the accelerator 100, so that the accelerator 100 can emit a beam normally.

[0096] The brightness of the beam spot image can be compared with a pre-stored theoretical value of the brightness of the beam spot image to determine whether the brightness of the beam spot image is reduced, or the brightness of the beam spot image can be determined based on the experience of the staff. The position of the beam spot image in the detection element 1 can be compared with a pre-stored theoretical position of the beam spot image generated by the detection element 1 at a corresponding position in the detection element 1, or the position of the beam spot image in the detection element 1 can be determined based on the experience of the staff to determine whether the position is offset.

[0097] The positions where the detection element 1 performs multiple detections from the initial position to the second position may be multiple positions where the beam theoretically contacts the detection element 1 when the beam is emitted normally. The position detection member is used to determine whether the detection element 1 moves to the position theoretically contacting the beam, and observes the beam spot image generated by the detection element 1 at this position or observes whether the detection element 1 generates a beam spot image.

[0098] When the beam needs to be optimized, the detection element 1 is moved to the desired measurement position to measure the beam at the corresponding position, and the quality of the beam at the corresponding position is judged by the beam information detected by the detection element 1. The detection element 1 generates a beam spot image, and the beam quality is judged by observing at least one of the position of the beam spot image in the detection element 1, the brightness of the beam spot image, the shape of the beam spot, and the distribution of the beam spot. The beam spot image generated by the detection element 1 at the desired measurement position can be measured in advance and a standard image can be stored. The beam quality can be judged by comparing the standard image with the actual beam spot image in terms of position, brightness, shape, beam spot distribution, etc., or the staff's experience and theoretical value can be used to judge whether the beam quality can be improved. If the beam can be improved, the accelerator is adjusted to improve the beam quality.

[0099] When the accelerator beam fails, the detection element 1 can be moved from the second position toward the initial position, and the beam information of the beam at multiple positions can be detected to analyze the cause of the beam failure of the accelerator 100. Specifically, the detection element 1 is moved gradually from the second position toward the initial position, and the beam is measured multiple times. If at least one of the position, beam brightness, beam shape, and beam distribution of the beam spot image generated by the detection element 1 at at least one of the multiple positions deviates from the position in the detection element 1, the beam brightness, beam shape, and beam distribution, it is determined that the beam fails at the corresponding position. At this time, the accelerator 100 is adjusted so that the position, beam brightness, beam shape, and beam distribution of the beam spot images detected at multiple positions during the movement of the detection element 1 from the second position toward the initial position all meet the requirements.

[0100] The adjustment of the accelerator 100 can be analyzed based on the beam spot image generated by the detection element 1 to determine the adjustment method and adjustment direction of the accelerator.

[0101] In step S05, when the detection element 1 needs to be disassembled or assembled, the flange 33 of the vacuum retaining member 3 is removed to create an opening in the vacuum retaining member 3 that is connected to the outside world. The driving element 2 drives the detection element 1 to move out of the vacuum retaining member 3 from the opening after the flange 33 is removed from the vacuum retaining member 3, so as to disassemble or assemble or adjust the detection element 1.

[0102] 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. A beam detection device, characterized in that: include: A detection element (1), used for contacting with the beam to detect beam information; The detection element is provided with a front end detection surface, which is arranged to intersect with the beam moving direction and is larger than the area occupied by two adjacent beam spots of different beams at a first position (105) and two adjacent beam spots at a second position (106), so as to achieve simultaneous contact with multiple beams spaced apart from each other along the radial direction of the accelerator and different parts of the same beam spaced apart by a certain distance along the radial direction of the accelerator, and the front end detection surface extends to cover the first position (105) and the second position (106); A driving element (2), comprising an extension rod assembly (21) extending along a beam extraction channel and a driving member (23) connected to the extension rod assembly (21), wherein the driving member (23) is arranged outside an accelerator (100) for generating a beam, one end of the extension rod assembly (21) is connected to the detection element (1) and is capable of driving the detection element (1) to move; one end of the extension rod assembly (21) extending to the inside of the accelerator (100) along a first direction is spaced from the beam, and one end of the extension rod assembly (21) used for connecting to the detection element (1) is connected to a connecting rod (211) perpendicular to or parallel to a long straight side of a D-shaped member (101) of the accelerator (100), wherein the connecting rod (211) extends along a second direction; The driving member (23) can indirectly drive the detection element (1) to move in the vacant area of ​​the accelerator (100) along the beam radius direction through the extension rod assembly (21) without touching other elements of the accelerator; the detection element (1) can only contact the acceleration area and the extraction area of ​​the beam; along the extension direction of the ion source, i.e., in the direction perpendicular to the semicircular surface (104) of the D-shaped member (101), the projection of the detection element (1) does not overlap with the projections of other elements in the accelerator (100).

2. The beam detection device according to claim 1, characterized in that: It also comprises a vacuum holder (3), the interior of the vacuum holder (3) being hollow and forming a vacuum connection cavity (31) located outside the accelerator (100) and capable of communicating with the interior of the accelerator (100); one end of the extension rod assembly (21) for connecting with the detection element (1) passes through the vacuum connection cavity (31) and extends into the accelerator (100).

3. The beam detection device according to claim 2, characterized in that: It also includes an image receiving element (4); the detection element (1) is a fluorescent target component, and the detection element (1) is capable of receiving a beam to generate a beam spot image corresponding to the beam; the image receiving element (4) is used to obtain the beam spot image generated by the detection element (1); And / or, the accelerator (100) is a synchrocyclotron accelerator.

4. The beam detection device according to claim 3, characterized in that: The vacuum retaining member (3) is provided with a flange (33) for sealing the vacuum connecting cavity (31), and the flange (33) is provided with an observation window (32). The image receiving element (4) is arranged at one end of the flange (33) away from the vacuum connecting cavity (31) and acquires the beam spot image generated by the detection element (1) through the observation window (32).

5. The beam detection device according to claim 3, characterized in that: It also includes an adjustment component (41), wherein the adjustment component (41) is connected to the image receiving element (4) and is used to adjust the position of the image receiving element (4); And / or, it also includes a display module, which is connected to the image receiving element (4) and is used to generate image information of the beam spot image acquired by the image receiving element (4).

6. The beam detection device according to claim 1, characterized in that: The driving element (2) further comprises a limiting member, wherein the limiting member limits the path range of the driving element (2) driving the detection element (1) to move; And / or, the driving element (2) is further connected to a position detection element, and the position detection element detects the displacement of the detection element (1) driven by the driving element (2).

7. The beam detection device according to claim 1, characterized in that: It also comprises a plurality of support members (22), wherein the plurality of support members (22) are arranged at intervals along the extension direction of the extension rod assembly (21), and the support members (22) are used to support the extension rod assembly (21); And / or, the extension rod assembly (21) comprises a screw rod (212) connected to the driving member (23), a screw nut (213) connected to the screw rod (212), and an extension rod (214) connected to the screw nut (213), and one end of the extension rod (214) facing away from the screw nut (213) is connected to the detection element (1).

8. A beam detection method for a synchrocyclotron accelerator, characterized in that: include: A beam detection device according to any one of claims 1 to 7 is provided, wherein a driving element of the beam detection device drives a detection element to move into an accelerator and locate at an initial position, wherein the initial position is not located at a position where gas is injected into a center of the accelerator; The accelerator generates a beam, and the beam contacts the detection element so that the detection element generates beam information corresponding to the beam; The driving element drives the detection element to move along a first direction so that the detection element can continuously measure beam information between an initial position and a second position, wherein the second position is located in a beam extraction region; the initial position is located in a region where gas begins to accelerate after being ionized into protons; and the first direction is perpendicular to a direction in which gas is injected into the center of the accelerator; The beam quality is determined by the beam information detected by the detection element.

9. The beam detection method according to claim 8, characterized in that: The “driving element of the beam detection device drives the detection element to move into the accelerator and locate at the initial position” includes: A vacuum holder is arranged outside the accelerator, the vacuum holder forms a vacuum connection cavity communicated with the inside of the accelerator, and the driving element drives the detection element to pass through the vacuum connection cavity and extend to the inside of the accelerator; The beam detection method further includes: The vacuum holding member is opened to allow the vacuum connection chamber to communicate with the outside world, and the driving element drives the detection element to move out of the vacuum holding member to the outside world to adjust or disassemble the detection element.

10. The beam detection method according to claim 8, characterized in that: The “driving element of the beam detection device drives the detection element to move into the accelerator and locate at the initial position” includes: A position detection element is provided in the driving element, and the position detection element detects the displacement of the detection element driven by the driving element; when the driving element drives the detection element to move to an initial position, the position detection element is recorded as zero position.

11. The beam detection method according to claim 8, characterized in that: The “driving element drives the detecting element to move along the first direction” includes: The driving element drives the detection element to move between an initial position and a second position, wherein the initial position is located in an area of ​​the beam acceleration zone adjacent to the center of the accelerator, and the second position is located on an extraction path of the beam extraction zone, and the beam is extracted from the accelerator after passing through the second position.

12. The beam detection method according to claim 11, characterized in that: The detection element contacts the beam and generates a beam spot image corresponding to the beam; The “judging the beam quality by the beam information detected by the detection element” includes: Providing an image receiving element, wherein the image receiving element acquires the beam spot image generated by the detection element; A display module is provided, which is connected to the image receiving element and is used to generate image information of the beam spot image acquired by the image receiving element, and the beam quality is judged according to the image information generated by the display module.

13. The beam detection method according to claim 12, characterized in that: The “determining the beam quality according to the image information generated by the display module” includes: When the accelerator emits a beam for the first time, judging whether the accelerator emits a beam normally according to a plurality of beam current information generated during the movement of the detection element from the initial position to the second position; and / or, moving the detection element to a desired measurement position, and judging the quality of the beam at the desired position by using the beam information detected by the detection element; And / or, when the accelerator beam fails, the detection element is moved from the second position toward the initial position, and beam information of the beam at multiple positions is detected to analyze the cause of the accelerator beam failure.

14. The beam detection method according to claim 13, characterized in that: The “when the accelerator emits a beam for the first time, judging whether the accelerator emits a beam normally according to a plurality of beam flow information generated during the movement of the detection element from the initial position to the second position” includes: It is detected whether the detection element generates a beam spot image and / or whether the brightness of the beam spot image decreases at a plurality of positions from the initial position to the second position. If the detection element does not generate a beam spot image or the brightness of the beam spot image decreases at at least one of the plurality of positions from the initial position to the second position, it is determined that the accelerator does not emit beams normally. If the detection element generates beam spot images at each of the plurality of positions from the initial position to the second position and the brightness of the beam spot image does not decrease, it is determined that the accelerator emits beams normally.

15. The beam detection method according to claim 13, characterized in that: The “judging the quality of the beam at the desired position by the beam information detected by the detection element” includes: The beam quality is determined by at least one of the position of the beam spot image detected by the detection element in the detection element, the beam spot brightness, the beam spot shape and the beam spot distribution; And / or, the “when the accelerator beam fails, moving the detection element from the second position toward the initial position, and detecting beam information at multiple positions to analyze the cause of the accelerator beam failure” includes: The cause of accelerator beam failure is analyzed by detecting at least one of the position of beam spot images at multiple positions of the beam in the detection element, the beam spot brightness, the beam spot shape and the beam spot distribution.

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