Beam current detection device and beam current detection method

Abstract

The application discloses a kind of beam detection device and beam detection method, wherein, beam detection device includes detection element and driving element;Detection element is used to contact with beam to detect beam information;Driving element includes the extension rod assembly extending along beam extraction channel and the driving piece connected with the extension rod assembly, the driving piece is set on the outside of the accelerator for generating beam, one end of the extension rod assembly is connected with the detection element and can drive the detection element to move;Wherein, the driving piece can indirectly drive the detection element to move in the vacant area of accelerator along the radius direction of beam by the extension rod assembly and will not touch other elements of accelerator, the detection element can only contact with the acceleration zone and extraction zone of beam.The beam detection device and beam detection method of the application realize more safely, efficiently, accurately detect larger range of beam information.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of synchrocyclotron technology, in particular to a particle beam detection device and a detection method. BACKGROUND

[0002] Various existing scientific laboratory accelerators, medical accelerator devices, industrial irradiation accelerators and other particle accelerators generate particle beams when working. Whether the path of the beam 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 running. The existing devices for assisting beam injection and extraction debugging generally use a beam detection device, such as a fluorescent target as a beam detection device. The fluorescent target generates a light spot when irradiated by the beam generated by the accelerator. By observing the shape and position of the light spot, it can be determined whether the path of the beam is accurate and assist in the injection and extraction debugging of the beam.

[0003] The existing fluorescent target includes a fluorescent target assembly capable of generating a light spot under the irradiation of the accelerator beam, a motor and other components for driving the fluorescent target assembly to move. The motor drives the fluorescent target assembly to move so that the fluorescent target can obtain information of a certain range of beams. 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 radial direction of the accelerator. Therefore, the fluorescent target can only obtain information of a small range of beams. SUMMARY

[0004] The purpose of the present application is to provide a beam detection device and a beam detection method for a synchrocyclotron, which can detect beams in a larger range.

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

[0006] A beam detection device, comprising:

[0007] A detection element for contacting a beam to detect beam information; the detection element is provided with a front end detection surface which is arranged to intersect the moving direction of the beam and is larger than the area occupied by the adjacent two beam spots at a first position and the adjacent two beam spots at a second position of different beams, so as to simultaneously contact multiple beams spaced apart along the radial direction of the accelerator and different parts of the same beam spaced apart along the radial direction of the accelerator, and the front end detection surface extends to cover the first position and the second position;

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

[0009] The driving member can indirectly drive the detecting element to move in the vacant area of the accelerator along the radial direction of the beam without contacting other elements of the accelerator through the extension rod assembly, the detecting element can only contact the acceleration area and the extraction area of the beam, and the projection of the detecting element along the extension direction of the ion source, i.e., the direction perpendicular to the semicircular surface of the D-shaped piece, does not overlap with the projection between the detecting element and other elements inside the accelerator.

[0010] Preferably, the vacuum retaining member is hollow inside and is formed with a vacuum connecting cavity arranged outside the accelerator and capable of communicating with the inside of the accelerator; the end of the extension rod assembly for connecting with the detecting element passes through the vacuum connecting cavity and extends into the accelerator.

[0011] Preferably, the image receiving element is further included; the detecting element is a fluorescent target assembly, and the detecting element can receive the beam to generate a beam spot image corresponding to the beam; the image receiving element is used to acquire the beam spot image generated by the detecting element.

[0012] Preferably, the accelerator is a synchrotron.

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

[0014] Preferably, the adjusting assembly is further included, the adjusting assembly is connected with the image receiving element and is used to adjust the position of the image receiving element.

[0015] Preferably, the display module is further included, the display module is connected with the image receiving element and is used to generate the image information of the beam spot image acquired by the image receiving element.

[0016] Preferably, the driving element further comprises a limiting member, the limiting member limits the path range of the driving element driving the detecting element to move.

[0017] And / or, the driving element is further connected with a position detecting member, which detects the displacement of the driving element driving the detecting element.

[0018] Preferably, a plurality of supporting members are further included, which are arranged along the extension direction of the extension rod assembly and used for supporting the extension rod assembly.

[0019] And / or, the extension rod assembly includes a lead screw connected with the driving member, a lead screw nut connected with the lead screw, and an extension rod connected with the lead screw nut, one end of the extension rod away from the lead screw nut being connected with the detecting element.

[0020] A beam detecting method, comprising:

[0021] Providing the beam detecting device of any one of the above, the driving element of the beam detecting device drives the detecting element to move into the accelerator and to be located at an initial position, the initial position not being located at the position where the gas is injected into the center of the accelerator;

[0022] The accelerator generates a beam, and the beam contacts the detecting element to make the detecting element generate beam information corresponding to the beam;

[0023] The driving element drives the detecting element to move along a first direction, so that the detecting element can uninterruptedly measure the beam information between the initial position and a second position, the second position being located at a beam extraction area, the initial position being located at an area where the gas is ionized into protons and then starts to be accelerated, and the first direction being perpendicular to the direction in which the gas is injected into the center of the accelerator;

[0024] The beam information detected by the detecting element is used to determine the quality of the beam.

[0025] Preferably, the "driving element of the beam detecting device drives the detecting element to move into the accelerator and to be located at an initial position" includes:

[0026] A vacuum maintaining member is arranged outside the accelerator, the vacuum maintaining member forms a vacuum connecting cavity in communication with the inside of the accelerator, and the driving element drives the detecting element to pass through the vacuum connecting cavity and extend into the inside of the accelerator;

[0027] The beam detecting method further includes:

[0028] The vacuum maintaining member is opened to make the vacuum connecting cavity communicate with the outside, and the driving element drives the detecting element to move out of the vacuum maintaining member to the outside to adjust or disassemble the detecting element.

[0029] Preferably, the "driving element of the beam detecting device drives the detecting element to move into the accelerator and to be located at an initial position" includes:

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

[0031] Preferably, the "driving element driving the detection 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. The initial position is located in the region near the center of the accelerator along the path of the beam acceleration region. The second position is located on the exit path of the beam exit region, and the beam exits 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 phrase "determining beam quality through beam information detected by the detection element" includes:

[0035] An image receiving element is provided, which acquires a speckle 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 to determine the beam quality based on the image information generated by the display module.

[0037] Preferably, the step of "determining beam quality based on image information generated by the display module" includes:

[0038] When the accelerator first emits a beam, the accelerator is judged to be emitting a beam normally based on the multiple beam information generated during the movement of the detection element from the initial position to the second position.

[0039] And / or, move the detection element to the desired measurement position, and determine 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 at multiple positions is detected to analyze the cause of the accelerator beam failure.

[0041] Preferably, the step of "determining whether the accelerator is emitting a beam normally based on multiple beam current information generated during the movement of the detection element from the initial position to the second position when the accelerator emits a beam for the first time" includes:

[0042] Detecting whether the detecting element generates the beam spot image and / or whether the brightness of the beam spot image is reduced at the plurality of positions from the initial position to the second position, if the detecting element does not generate the beam spot image or the brightness of the beam spot image is reduced at at least one of the plurality of positions from the initial position to the second position, it is judged that the accelerator does not generate the beam normally, if the detecting element generates the beam spot image respectively at the plurality of positions from the initial position to the second position and the brightness of the beam spot image is not reduced, it is judged that the accelerator generates the beam normally.

[0043] Preferably, the "judging the quality of the beam at the required position by the beam information detected by the detecting element" comprises:

[0044] At least one of the position of the beam spot image in the detecting element, the brightness of the beam spot, the shape of the beam spot and the distribution of the beam spot is detected by the detecting element to judge the quality of the beam;

[0045] And / or, the "moving the detecting element from the second position to the initial position when the accelerator beam fails, and detecting the beam information of the beam at a plurality of positions to analyze the cause of the accelerator beam failure" comprises:

[0046] At least one of the position of the beam spot image in the detecting element, the brightness of the beam spot, the shape of the beam spot and the distribution of the beam spot is detected by the detecting element to analyze the cause of the accelerator beam failure.

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

[0048] By arranging the driving element outside the accelerator, the driving element is not limited by the internal space of the accelerator, the driving element can have a larger driving length, and the driving element can drive the detecting element to move in a larger range in the control area inside the accelerator, so as to realize the detection of the beam acceleration area and the extraction area, and further realize the comprehensive and efficient uninterrupted detection of the large range area of the beam. BRIEF DESCRIPTION OF DRAWINGS

[0049] Figure 1 is the structure schematic diagram of the beam detection device and the accelerator of the embodiment of the present application;

[0050] Figure 2 is the structure schematic diagram of the beam detection device and part of the beam of the extraction area of the embodiment of the present application;

[0051] Figure 3 is the structure schematic diagram of the part of the accelerator and the detecting element of the beam detection device in the initial position of the embodiment of the present application;

[0052] Figure 4 is the structure schematic diagram of the part of the accelerator and the detecting element of the beam detection device in the second position of the embodiment of the present application

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

[0054] Figure 6 is a partial structure diagram of a beam detection device according to an embodiment of the present application;

[0055] Figure 7 is a structure diagram of a D-shaped piece of a synchrocyclotron according to an embodiment of the present application;

[0056] Figure 8 is a diagram of beam spots of a plurality of beams at a plurality of positions that can contact a front detection surface of a detection element according to an embodiment of the present application.

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

[0058] Example embodiments now will be described more fully hereinafter with reference to the accompanying drawings; however, the example embodiments can be implemented in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the example embodiments to those skilled in the art. Like reference numerals refer to like elements throughout the figures, and thus description of the same will be simplified or omitted.

[0059] The words expressing position and direction described in the present application are explained by taking the figures as an example, but changes can be made according to needs, and the changes made are included in the protection scope of the present application.

[0060] As Figures 1 to 4As shown, the present application provides a beam detection device for detecting the beam 102 generated by the accelerator 100, which comprises a detection element 1 for detecting the beam 102, a driving element 2 for driving the detection element 1 to move, and can further comprise a vacuum holder 3. Wherein the accelerator 100 is a device for generating the beam 102, and the accelerator 100 comprises a beam generation device for generating the beam 102, and the beam generation device can specifically comprise an ion source, and the beam detection device is used for detecting the beam generated by the beam generation device. The accelerator 100 can be any one of a scientific research laboratory accelerator, a medical accelerator device, an industrial irradiation accelerator, etc. Specifically, in this embodiment, the accelerator 100 can be a synchrocyclotron proton accelerator in a medical accelerator device, and the beam 102 generated by the accelerator 100 can be a proton beam, and the beam 102 is in a spiral shape.

[0061] The detection element 1 can be accommodated inside the accelerator 100, for example, one end of the detection element 1 for detecting the beam 102 information is accommodated in the vacant area inside the accelerator 100, and the detection element 1 can be in contact with the beam 102 to generate test information corresponding to the beam 102. Wherein the vacant area of the accelerator 100 is a cavity reserved by the accelerator 100 itself, and part of the beam generated by the accelerator 100 passes through the vacant area; in the prior art, the vacant area of the accelerator 100 needs to be installed with a magnetic pole, a motor and a fluorescent target assembly, and the motor drives the fluorescent target assembly to move; by setting the vacant area as the moving space of the detection element 1, the detection element 1 can move in a large range along the beam radius direction on one side of the D-shaped piece 101 without obstacles, i.e. without interfering with the internal parts of the accelerator 100, specifically, the detection element 1 can be moved from the acceleration area close to the beam center position to the extraction area far from the beam center position, thereby realizing more secure detection of the beam acceleration area and the extraction area. Wherein when detecting the beam, the beam generation device is arranged on one side of the detection element 1, and the detection element 1 is spaced apart from the beam generation device along the direction perpendicular to the moving direction of the detection element 1. The D-shaped piece 101 is used for accelerating the beam 102 generated by the accelerator 100. As shown in the figure, Figure 7 As shown, the D-shaped piece 101 comprises a pair of semicircular surfaces 104 arranged 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 each have a long straight edge 103.

[0062] In the embodiment, the beam 102 does not need to be introduced, i.e., there is no place where the beam is introduced, and there is no beam center region or injection region as arranged in the prior art, so that the place where the beam 102 is introduced, i.e., the introduction region, does not need to be measured, making the beam 102 measurement more efficient. In the embodiment, the detection element 1 only contacts the acceleration region and the extraction region of the beam 102, and the beam detection efficiency is high; and in the direction perpendicular to the semicircular surface 104 of the D-shaped piece 101 along the extension direction of the ion source, the projection of the detection element 1 does not overlap with the projection between other elements inside the accelerator 100, for example, the projection of the detection element 1 does not overlap with the projection between the ion source, the D-shaped piece 101 and other components inside the accelerator 100, avoiding the detection element 1 from colliding with other elements inside the accelerator 100, so that the detection is faster and safer.

[0063] With reference to Figure 2 In some embodiments, the detection element 1 can be a fluorescent target assembly, the detection element 1 can be completely accommodated inside the accelerator 100, and the detection element 1 can be arranged on the extension path, i.e., the moving path, of the beam 102, 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 in the interaction, and the secondary particles react with the fluorescent material in the detection element 1 to emit visible light, so that the detection element 1 receives the beam 102 and generates a light spot corresponding to the beam 102, i.e., a beam spot image.

[0064] With reference to Figure 6 The driving element 2 includes an extension rod assembly 21 and a driving member 23. The driving member 23 is arranged outside the accelerator 100, and the driving member 23 is used to drive the extension rod assembly 21 to move in the radial direction of the beam. One end of the extension rod assembly 21 can be connected with the driving member 23 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 in the radial direction of the beam through the extension rod assembly 21. When it is needed to move the detection element 1 inside the accelerator 100, the end of the extension rod assembly 21 connected with the detection element 1 can extend into the accelerator 100, and the detection element 1 is driven by the driving member 23 outside the accelerator 100 to move in the radial direction of the beam.

[0065] Since the extension rod assembly 21 is extended to one end inside the accelerator 100 in the first direction and spaced from the beam 102, at this time, the end of the extension rod assembly 21 for connecting with the detection element 1 can be connected with the connecting rod 211, the connecting rod 211 is perpendicular or parallel to the long straight edge 103 of the D-shaped piece 101 of the accelerator 100, the connecting rod 211 can be extended in the second direction, and the end of the connecting rod 211 facing the beam 102 is connected with 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. Wherein, the first direction and the second direction intersect, the first direction can be the direction from the driving member 23 to the detection element 1 located in the accelerator 100, and the first direction can be parallel to the radial direction of the accelerator 100, and the second direction is the direction from the end of the connecting rod 211 extending into the accelerator 100 to the detection element 1.

[0066] The driving element 2 can further include a mounting bracket 25, the mounting bracket 25 is arranged outside the accelerator 100 and fixed with the accelerator 100, and the driving member 23 is fixedly mounted on the mounting bracket 25.

[0067] Referring to Figure 5 Since the extension rod assembly 21 is long, the extension rod assembly 21 can be bent due to its own weight and cause the position of the detection element 1 connected with the extension rod assembly 21 to deviate. In order to support the extension rod assembly 21 to keep the extension rod assembly 21 in a straight extension state, the extension rod assembly 21 is connected with a plurality of supporting members 22, the plurality of supporting members 22 are arranged at intervals along the extension direction of the extension rod assembly 21 and apply supporting force to different positions of the extension rod assembly 21, thereby partially or completely offsetting the gravity of the extension rod assembly 21. Wherein, the supporting member 22 can be mounted on the fixed part in the accelerator 100, for example, part of the supporting members 22 are mounted on the mounting bracket 25 of the driving element 2, and part of the supporting members 22 are mounted on other parts fixed with the accelerator 100, so that the position of the supporting member 22 is fixed, and the supporting member 22 is also provided with a containing groove for the extension rod assembly 21 to pass through, part of the supporting member 22 is arranged in the containing groove and abuts against the wall forming the containing groove, so that the supporting member 22 can support the extension rod assembly 21.

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

[0069] In the existing beam detection device, the detection element and the motor are arranged in the accelerator 100. Due to the limitation of the installation space inside the accelerator 100, the installation positions of the motor and the detection element in the accelerator 100 are limited, and the volume of the motor also needs to be set as 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 generating the beam 102, the existing arrangement of the motor in the accelerator 100 needs to use a motor that can resist strong magnetic fields, which has a high cost. By arranging 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 space inside 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 strong magnetic component, which can reduce the cost of the driving element 2.

[0070] The extension rod assembly 21 is connected with the detection element 1 and the driving member 23, so that the detection element 1 can move in a larger range under the driving of the driving member 23. In the beam detection device of the present application, the detection element 1 can move between a position close to the center position of the accelerator 100, i.e., the center position of the beam, to 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 region and the extraction region of the beam. Specifically, the detection element 1 can move between a first distance from the center position of the accelerator 100 to a 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 region or the position adjacent to the starting position of the beam acceleration region. The second distance from the center position of the accelerator 100 can be the position of the final extraction of the accelerator 100 in the beam extraction region. The difference between the second distance and the first distance is greater than the moving range of the detection element in the prior art, which realizes uninterrupted detection of a larger range of the beam.

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

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

[0073] Since part of the extension rod assembly 21 is accommodated in the vacuum connecting cavity 31 of the vacuum holder 3, a plurality of support elements 22 can be arranged in the vacuum connecting cavity 31 of the vacuum holder 3. The support elements 22 are fixedly connected with the inner wall of the vacuum holder 3 and can be used to support part of the extension rod assembly 21 or the detection element 1 accommodated in the vacuum connecting cavity 31.

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

[0075] In some specific embodiments, in order to limit the movement path of the detection element 1, the driving element 2 can include a limiting piece. The limiting piece can be provided with two. The limiting piece can 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 limiting piece, and the limiting piece 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 limiting piece, and the limiting piece limits the further movement of the extension rod assembly 21. Wherein, the limiting piece can be a limiting block, and the initial position of the detection element 1 can be the starting point of the detection of the beam acceleration area, for example, the first distance from the beam center position in the radial direction of the beam. The detection element 1 moves out of the vacuum holder 3 can be the third distance from the beam center position in the radial direction of the beam. The third distance is greater than the second distance, and the second distance is greater than the first distance.

[0076] In order to facilitate the position of the detection element 1, the driving element 2 can be connected with a position detection piece. The position detection piece can detect the displacement of the driving element 2 driving the detection element 1. Specifically, when the detection element 1 is located at the initial position, the position detection piece can be recorded as zero position; when the detection element 1 moves from the initial position in the radial direction of the beam, the position detection piece feedbacks the displacement of the driving element 2 driving the detection element 1 in real time, and then judges the position of the detection element 1. Wherein, the position detection piece can be a potentiometer, and the position detection piece is connected with the driving element 23.

[0077] Reference Figure 5In some embodiments, the beam current detection device can further comprise an image receiving element 4, which can be arranged outside the vacuum holder 3 and the accelerator 100, and the end of the vacuum holder 3 facing the image receiving element 4 is provided with a viewing window 32. The image receiving element 4 can obtain the beam spot image generated by the detection element 1 through the viewing window 32. By using the viewing window 32, when the vacuum holder 3 and the accelerator 100 form a sealed structure, the image receiving element 4 outside the vacuum holder 3 and the accelerator 100 can obtain the image information of the detection element 1 inside the accelerator 100. The viewing window 32 can be arranged on the flange plate 33, and the image receiving element 4 is arranged at the end of the flange plate 33 away from the vacuum connection cavity 31.

[0078] Due to installation tolerances and other reasons, the image receiving element 4 can be offset from the detection element 1 when the beam current detection device is installed, which can cause the image receiving element 4 to only obtain part of the beam spot image information generated by the detection element 1 or fail to obtain the beam spot image information. To adjust the relative position between the image receiving element 4 and the detection element 1, the beam current detection device can further comprise an adjusting assembly 41 connected to the image receiving element 4 to adjust the position of the image receiving element 4. Specifically, the adjusting assembly 41 can be used to adjust the position of the image receiving element 4 in a first direction and a second direction. The first direction, the second direction, and the axial direction of the adjusting assembly 41 are perpendicular to each other.

[0079] In some embodiments, the adjusting assembly 41 can comprise a mounting sleeve 411, a fixing plate 412, and an adjusting unit. The mounting sleeve 411 can be sleeved on the image receiving element 4, and the mounting sleeve 411 can be connected with a screw or other fastener. The screw connected with the mounting sleeve 411 can 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 can be fixedly mounted on the vacuum holder 3, for example, the fixing plate 412 is fixedly connected to the vacuum holder 3 by screws, clamps, or integral molding. The adjusting 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 adjusting the position of the image receiving element 4 locked in the mounting sleeve 411.

[0080] The adjusting unit can be a sliding block structure, so that the mounting sleeve 411 can slide relative to the fixed plate 412 in the first direction and the second direction;Or, the adjusting unit can also be a motor or the like driving member mounted on the fixed plate 412 and capable of driving the mounting sleeve 411 to move in the first direction and the second direction;Or, the adjusting unit can also be a plurality of screws threaded into the mounting sleeve 411, and the mounting sleeve 411 is in clearance fit with the image receiving element 4, the plurality of screws all extend through the outer wall of the mounting sleeve 411, and the position of the image receiving element 4 in the mounting sleeve 411 is adjusted by adjusting the depth of the plurality of screws screwed into the mounting sleeve 411, so that 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 adjusting unit can also adopt other structures capable of adjusting 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 is not limited here.

[0081] The application further provides a beam detection method which can be applied to the above-mentioned beam detection device. The beam detection method comprises steps S01 and S04, and can further comprise step S05.

[0082] Step S01: providing a detection element 1 and a driving element 2, the driving element 2 drives the detection element 1 to move from the beam extraction channel of the accelerator 100 to the inside of the accelerator 100 and locate at an initial position. The initial position is not located at the position where the gas is injected into the center of the accelerator 100, and the initial position can be located in the region where the gas is ionized into protons and then starts to accelerate.

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

[0084] Step S03: the driving element 2 drives the detection element 1 to move in 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 on the path of moving in the beam radius direction. Wherein, the second position 106 can be located in 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 make the vacuum connection cavity 31 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 to adjust or disassemble the detection element 1.

[0087] The step S01 can specifically include: providing a vacuum holder 3 provided with a vacuum connecting cavity 31, the vacuum holder 3 is arranged outside the accelerator 100 and the vacuum connecting cavity 31 is in communication with the inside of the accelerator 100. The driving element 2 can drive the detection element 1 to move, and then the detection element 1 passes through the vacuum connecting cavity 31 to move to the inside of the accelerator 100 which is in communication with the vacuum connecting cavity 31.

[0088] In addition, a position detection element can also be arranged in the driving element 2, when the detection element 1 is driven by the driving element 2 to move to the initial position, the position detection element can be recorded as zero position, for example, the position detection element can be zeroed. When the detection element 1 moves, the data detected by the position detection element judges the position of the detection element 1.

[0089] In step S02, when the vacuum holder 3 is sealed, the accelerator 100 can enter the working state, at this time the vacuum connecting cavity 31 of the vacuum holder 3 can form a vacuum cavity, and the inside of the accelerator 100 is a vacuum strong magnetic environment, and the beam generation device in the accelerator 100 generates a beam 102. The beam 102 includes an acceleration zone and an extraction zone. The beam 102 gradually extends outward in a spiral along the acceleration zone and the extraction zone, and is extracted from the extraction zone to complete the beam out of the accelerator 100. In this embodiment, the beam 102 does not have an injection zone, that is, the beam does not need to be injected but is directly generated at the center position of the accelerator, and the beam detection is more efficient without beam detection in the injection zone. The acceleration zone is the region where the particles are accelerated, and the extraction zone is the region where the particles complete acceleration to form a high-energy particle beam and are extracted to the outside.

[0090] When the detection element contacts the beam, a beam spot image corresponding to the beam will be generated, which is the beam information generated by the detection element.

[0091] In step S03, the driving element 2 drives the detection element 1 to move between the initial position and the second position 106. Referring to Figure 3 , the initial position can be located on the path of the beam acceleration zone, for example, located at the part adjacent to the accelerator center of the beam acceleration zone. Referring to Figure 4 , the second position 106 is located on the extraction path of the beam extraction zone, and the beam is extracted from the accelerator 100 to complete the beam out after passing through the second position 106. Wherein, the acceleration zone of the beam is positively correlated with the region adjacent to the accelerator center, and the beam condition of the region adjacent to the accelerator center can be reflected by detecting the acceleration zone, so the initial position can be located on the path of the beam acceleration zone, and the region of the beam which needs to be detected is from the initial position to the second position 106. When the region which needs to be detected by the beam is other region, the initial position and the second position 106 of the beam can also be adjusted according to the actual region which needs to be detected by the beam.

[0092] Referring toFigure 8 The detection element is provided with a front end detection surface, the front end detection surface is arranged to intersect the moving direction of the beam, and the area of the front end detection surface is greater than the area of the adjacent two beam spots 107 on the first position 105 and the adjacent two beam spots 107 on the second position 106, so as to realize the simultaneous contact of multiple beam currents along the accelerator radius direction and the different parts of the same beam current along the accelerator radius direction, and the front end detection surface extends to cover the first position 105 and the second position 106. In this way, the detection element in the embodiment can contact multiple beam currents at multiple positions and the same beam current at different positions at the same time, thereby more efficiently and comprehensively obtaining beam current information, and more accurately judging the beam current condition. The second position 106 is closer to the beam extraction channel than the first position 105.

[0093] The step S04 specifically comprises: 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, the display module is connected with the image receiving element 4 and is used to generate image information of the beam spot image acquired by the image receiving element 4, and the display module is used to judge the beam current quality according to the generated image information. The display module includes a display screen, and the display module displays the image information through the display screen, so as to facilitate the observation of the staff.

[0095] When the accelerator is first accelerated, it is necessary to ensure that the beam forms a continuous spiral path in the acceleration zone and the extraction zone and is extracted from the accelerator 100. At this time, whether the accelerator is normally extracted is determined according to the plurality of beam information produced during the movement of the detection element 1 from the initial position to the second position 106. For example, 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 is detected. When the detection element 1 cannot generate a beam spot image or the brightness of the beam spot image decreases in the corresponding region during the movement of the detection element 1 from the initial position to the second position 106, it is determined that the beam in the accelerator is abnormal and cannot be normally extracted. Specifically, when the detection element 1 is at the initial position, whether the detection element 1 generates a beam spot image at the initial position is observed by the display module. 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, a plurality of positions of the beam are detected. When the detection element 1 generates a beam spot image 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 beam extraction path is correct. If at least one of the plurality of positions 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 extraction is abnormal and the accelerator is adjusted so that the detection element 1 generates a beam spot image at each of the plurality of positions from the initial position to the second position. When the detection element 1 moves to the second position, whether the detection element 1 generates a beam spot image and the relative position of the beam spot image on the detection element 1 are observed. 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 the beam at the outlet of the accelerator 100 can be detected, so that the accelerator 100 can be normally extracted.

[0096] The brightness of the beam spot image can be compared with the theoretical value of the brightness of the beam spot image stored in advance to determine whether the brightness of the beam spot image decreases, or the brightness of the beam spot image can be determined according to the experience of the staff. The position of the beam spot image in the detection element 1 can be compared with the theoretical position of the beam spot image generated by the detection element 1 at the corresponding position stored in advance, or the position of the beam spot image in the detection element 1 can be determined according to the experience of the staff.

[0097] The positions of the detection element 1 at which the detection element 1 performs multiple detections from the initial position to the second position can be positions at which the beam is normally emitted and the beam theoretically contacts the detection element 1. The position detection member judges whether the detection element 1 moves to the position at which the beam theoretically contacts the detection element 1, and observes the beam spot image generated by the detection element 1 or whether the detection element 1 generates the beam spot image at the position.

[0098] When the beam needs to be optimized, the detection element 1 is moved to a desired measurement position to measure the beam at the corresponding position, and the quality of the beam at the corresponding position is judged according to the beam information detected by the detection element 1. The detection element 1 generates a beam spot image, and 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 is observed to judge the quality of the beam. The beam spot image generated by the detection element 1 at the desired measurement position can be pre-measured and a standard image can be stored. The quality of the beam is judged by comparing the differences between the standard image and the actual beam spot image, such as the position, brightness, shape, and beam spot distribution. Alternatively, the quality of the beam can be judged by the experience of the staff and the theoretical value to determine whether the quality of the beam can be improved. If the quality of the beam can be improved, the accelerator is adjusted to improve the quality of the beam.

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

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

[0101] In step S05, when the detection element 1 needs to be disassembled, the flange plate 33 of the vacuum retaining member 3 is removed to form an opening in communication with the outside, and the driving element 2 drives the detection element 1 to move out of the vacuum retaining member 3 through the opening after the flange plate 33 is removed, so that the detection element 1 can be disassembled or adjusted.

[0102] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and that changes, modifications, substitutions and variations can be made to the above-described embodiments without departing from the principles and spirit of the present application, and all such changes, modifications, substitutions and variations are to be construed as falling within the scope of the present application as defined by the appended claims.

Claims

1. A beam detection device, characterized in that, The application relates to a detection device for detecting beam information of a particle beam, comprising: a detection element (1) for contacting the particle beam; the detection element is provided with a front detection surface which is arranged to intersect the moving direction of the particle beam and is larger than the area occupied by two adjacent beam spots of different particle beams at a first position (105) and two adjacent beam spots of the same particle beam at a second position (106), so as to simultaneously contact multiple particle beams which are spaced apart along the radius direction of an accelerator and different parts of the same particle beam which are spaced apart along the radius direction of the accelerator, and the front 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 with the extension rod assembly (21), the driving member (23) is arranged outside an accelerator (100) for generating the particle beam, one end of the extension rod assembly (21) is connected with the detection element (1) and can drive the detection element (1) to move; the extension rod assembly (21) extends to one end inside the accelerator (100) and is spaced apart from the particle beam along a first direction, and a connecting rod (211) which is perpendicular or parallel to the long straight side of a D-shaped piece (101) of the accelerator (100) is connected with the end of the extension rod assembly (21) for connecting with the detection element (1), and the connecting rod (211) extends along a second direction. The driving member (23) can indirectly drive the detection element (1) to move along the radius direction of the particle beam in the empty area of the accelerator (100) and does not collide with other elements of the accelerator, the detection element (1) can only contact the acceleration area and the extraction area of the particle beam, and the projection of the detection element (1) does not overlap with the projection of other elements in the accelerator (100) along the extension direction of the ion source, that is, the direction perpendicular to the semicircular surface (104) of the D-shaped piece (101). The application further comprises a vacuum retaining member (3) which is hollow inside and is provided with a vacuum connecting cavity (31) which is located outside the accelerator (100) and can communicate with the inside of the accelerator (100); the end of the extension rod assembly (21) for connecting with the detection element (1) penetrates through the vacuum connecting cavity (31) and extends into the accelerator (100). The application further comprises an image receiving element (4); the detection element (1) is a fluorescent target assembly, and the detection element (1) can receive the particle beam to generate beam spot images corresponding to the particle beam; the image receiving element (4) is used for acquiring the beam spot images generated by the detection element (1). The accelerator (100) is a synchrotron.

2. The beamlet detection device of claim 1, wherein The vacuum retaining member (3) is provided with a flange plate (33) for plugging the vacuum connecting cavity (31), the flange plate (33) is provided with an observation window (32), and the image receiving element (4) is arranged at one end of the flange plate (33) away from the vacuum connecting cavity (31) and acquires the beam spot images generated by the detection element (1) through the observation window (32).

3. The beamlet detection device of claim 2, wherein, ​ ​ 4. The beamlet detection device of claim 3, wherein ​ 5. The beamlet detection device of claim 3, wherein, Further comprising an adjusting assembly (41) connected with the image receiving element (4) and used for adjusting the position of the image receiving element (4); And / or, further comprising a display module connected with the image receiving element (4) and used for generating image information of the beam spot image acquired by the image receiving element (4).

6. The beamlet detection device of claim 1, wherein, The driving element (2) further comprises a limiting piece for limiting the path range of the driving element (2) for driving the detection element (1) to move; And / or, the driving element (2) is further connected with a position detecting piece for detecting the displacement of the driving element (2) for driving the detection element (1).

7. The beamlet detection device of claim 1, wherein Further comprising a plurality of supporting pieces (22) which are arranged at intervals along the extension direction of the extension rod assembly (21) and used for supporting the extension rod assembly (21); And / or, the extension rod assembly (21) comprises a lead screw (212) connected with the driving piece (23), a lead screw nut (213) connected with the lead screw (212), and an extension rod (214) connected with the lead screw nut (213), wherein one end of the extension rod (214) away from the lead screw nut (213) is connected with the detection element (1).

8. A beam detection method for a synchrotron, characterized by, Providing the beam detection device according to any one of claims 1-7, the driving element of the beam detection device drives the detection element to move into the accelerator and to be located at an initial position, the initial position is not located at the position where the gas is injected into the center of the accelerator; The accelerator generates a beam, and the beam contacts the detection element to enable the detection element to generate beam information corresponding to the beam; The driving element drives the detection element to move in a first direction, so that the detection element can continuously measure the beam information between the initial position and a second position, the second position is located in the beam extraction area; the initial position is located in the area where the gas is ionized into protons and then starts to accelerate; the first direction is perpendicular to the direction in which the gas is injected into the center of the accelerator; The beam information detected by the detection element is used to determine the quality of the beam. The "driving element of the beam detection device drives the detection element to move into the accelerator and to be located at an initial position" comprises:

9. The beam detection method according to claim 8, characterized in that, A vacuum retaining piece is arranged outside the accelerator, the vacuum retaining piece forms a vacuum connecting cavity in communication with the inside of the accelerator, and the driving element drives the detection element to pass through the vacuum connecting cavity and extend into the inside of the accelerator; The beam detection method further comprises: The vacuum retaining piece is opened to enable the vacuum connecting cavity to communicate with the outside, and the driving element drives the detection element to move out of the vacuum retaining piece to the outside to adjust or disassemble the detection element. The "driving element of the beam detection device drives the detection element to move into the accelerator and to be located at an initial position" comprises:

10. The beam detection method of claim 8, wherein A position detecting piece is arranged in the driving element, the position detecting element detects the displacement of the driving element for driving the detection element, and when the driving element drives the detection element to move to the initial position, the position detecting piece is recorded as zero position. ​ 11. The beam detection method of claim 8, wherein, The driving element drives the detecting element to move along a first direction includes: The driving element drives the detecting element to move between an initial position and a second position, the initial position is located in a region adjacent to the accelerator center on the path of the beam acceleration region, and the second position is located on the extraction path of the beam extraction region, and the beam passes through the second position and is extracted from the accelerator.

12. The beam detection method of claim 11, wherein, The detecting element contacts the beam and generates a beam spot image corresponding to the beam; The beam information detected by the detecting element to determine the beam quality includes: An image receiving element is provided, which acquires the beam spot image generated by the detecting element; A display module is provided, which is connected with the image receiving element and is used to generate image information of the beam spot image acquired by the image receiving element, and determine the beam quality according to the image information generated by the display module.

13. The beam detection method of claim 12, wherein, The image information generated by the display module to determine the beam quality includes: When the accelerator first emits a beam, whether the accelerator normally emits a beam is determined according to a plurality of beam information generated by the detecting element during the movement from the initial position to the second position; And / or, the detecting element is moved to a required measurement position, and the beam quality at the required position is determined according to the beam information detected by the detecting element; And / or, when the accelerator beam fails, the detecting element is moved from the second position towards the initial position, and the beam information of the beam at a plurality of positions is detected to analyze the cause of the accelerator beam failure.

14. The beam detection method of claim 13, wherein The plurality of beam information generated by the detecting element during the movement from the initial position to the second position to determine whether the accelerator normally emits a beam when the accelerator first emits a beam includes: Whether the detecting element generates a beam spot image at a plurality of positions from the initial position to the second position and / or whether the brightness of the beam spot image is reduced is detected, if the detecting element does not generate a beam spot image at at least one of the plurality of positions from the initial position to the second position or the brightness of the beam spot image is reduced, it is determined that the accelerator does not normally emit a beam, if the detecting element generates a beam spot image at each of the plurality of positions from the initial position to the second position and the brightness of the beam spot image is not reduced, it is determined that the accelerator normally emits a beam.

15. The beam detection method of claim 13, wherein, The beam information detected by the detecting element to determine the beam quality at the required position includes: At least one of the position of the beam spot image in the detecting element, the brightness of the beam spot, the shape of the beam spot and the distribution of the beam spot detected by the detecting element is used to determine the beam quality; And / or, when the accelerator beam fails, the detecting element is moved from the second position towards the initial position, and the beam information of the beam at a plurality of positions is detected to analyze the cause of the accelerator beam failure. At least one of the position of the beam spot image in the detecting element, the brightness of the beam spot, the shape of the beam spot and the distribution of the beam spot detected by the detecting element is used to determine the beam quality.

Images