A beam test device for accelerator beam debugging

Abstract

The present invention discloses a beam test device for accelerator beam debugging, including an integrated short-distance test device without focusing or deflecting magnets, the test device including a vacuum chamber, at least two beam position detectors are integrated on the vacuum chamber along the accelerator beam emission direction, two beam position detectors connected to the vacuum chamber are symmetrically arranged on both sides of the vacuum chamber with adjustable center distance; a current measurement device and a beam garbage target are coaxially arranged on the vacuum pipeline where the beam position detector is located, and an insulating sealing structure to prevent the generation of image current is arranged on the current measurement device; and a vacuum pumping device is also integrated on the vacuum chamber. The test device does not carry any magnets, does not focus or deflect the beam, has a simple structure, and realizes the measurement of beam current, beam energy and beam spot size with the most simplified structure, has a small installation space, meets the requirements of ACCT current measurement for isolating image current, and can flexibly install the beam measurement device as needed.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a beam testing device used for accelerator beam debugging. Background Art

[0002] The beam debugging of the accelerator is an important task before the official operation of the accelerator. The debugging personnel determine the working state of the accelerator by measuring the beam parameters at the accelerator outlet and feed the measurement results back to the beam debugging, so that the accelerator reaches the best working state and realizes high-quality beam acceleration and transmission.

[0003] Accelerator beam debugging includes online beam debugging and offline beam debugging.

[0004] Online beam debugging means that after the installation of the accelerator and beam transmission line is completed, the beam is measured and monitored using the beam monitoring and diagnostic system installed on the beam transmission line to achieve overall beam debugging of the accelerator and beam transmission system.

[0005] For online testing, the accelerator beam debugging needs to be performed after the beam transmission line is installed. However, after the beam transmission line is introduced, the variables of beam debugging increase, the debugging difficulty increases, and the accelerator exit beam cannot be measured alone. In order to reduce the debugging difficulty, the best solution is to use offline debugging as much as possible. Offline beam debugging is to debug the accelerator beam alone before the system is installed.

[0006] During offline beam debugging of the accelerator, since the beam transmission line behind the accelerator has not been installed, a test device that can collect and monitor the beam is required. By installing the test device at the end of the accelerator, offline beam debugging of the accelerator can be realized.

[0007] The test device needs to have the characteristics of flexible installation and convenient testing, and can complete the accelerator beam debugging without affecting the installation of the large system.

[0008] Because there are many beam parameters that can be monitored during beam modulation, including flux intensity, energy, emittance, beam spot size, twist parameters, energy dispersion, etc.

[0009] For offline test devices, key beam parameters need to be selected for measurement. If too many indicators are monitored, the test device will be too large and complicated, increasing the difficulty of installation and processing costs. It also puts higher requirements on the installation space. Therefore, it is necessary to select appropriate beam parameters for offline measurement.

[0010] Flux and beam energy are the most important parameters. Flux can reflect the transmission efficiency of the accelerator, and beam energy can reflect whether the particles are accelerated correctly. Combining transmission efficiency and beam energy can reflect the working state of the accelerator to a great extent. Therefore, the first choice is to use the flux table and beam energy as the main parameters of offline measurement to design the offline test device.

[0011] Existing off-line test devices require a magnet element because they need to focus or deflect the beam. At present, the magnets of the beam test platform usually include:

[0012] 1) Quadrupole magnet: The quadrupole magnet generates a uniform gradient transverse magnetic field, which focuses and defocuses the beam. During the transmission process, the beam will gradually diverge outward under the action of the space charge force. When the beam test platform is long, it is necessary to apply a transverse focusing force to the beam to refocus the beam, otherwise the beam will only diverge outward until it is lost on the vacuum tube wall.

[0013] 2) Dipole magnet: The dipole magnet generates a uniform magnetic field in the vertical direction. When charged particles pass through the magnetic field area, they are affected by the Lorentz force, and the charged trajectory is deflected. The deflection radius is related to the particle energy and the magnetic field strength. A slit is set at the exit of the dipole magnet to allow only particles with a specific trajectory to pass through. By adjusting the magnetic field strength of the dipole magnet, the beam energy dispersion can be measured.

[0014] 3) Correction magnet: The correction magnet generates horizontal and vertical magnetic fields. When the beam passes through the correction magnet magnetic field area, it will be offset horizontally or vertically. By setting a smaller magnetic field strength, the center of the beam orbit can be corrected to avoid the offset of the beam center.

[0015] Since the existing offline test device needs to be equipped with a magnetic element, the test device has a complex structure and occupies a large installation space. Moreover, after the test device is set up, the beam measurement device cannot be flexibly disassembled and assembled according to needs, and the diversified design requirements of the test device cannot be met. At the same time, the existing test device will generate image current during the measurement process, which affects the measurement accuracy. Summary of the invention

[0016] The purpose of the present invention is to solve the problems that the existing test device needs to set up a magnet element due to the need to focus or deflect the beam, resulting in a complex device structure, and after the test device is set up, a beam measurement device cannot be flexibly installed as needed, and image current will be generated during measurement and use, affecting the measurement accuracy. A beam test device for accelerator beam debugging is provided, which does not have any magnets, does not focus or deflect the beam, has a simple test device structure, and can measure beam current intensity, beam energy and beam spot size with a simplest structure. The installation space is small, no image current will be generated, and the beam measurement device can be flexibly installed as needed.

[0017] The technical solution adopted by the present invention to achieve its invention purpose is: a beam test device for accelerator beam debugging, including an integrated short-distance test device without focusing or deflecting magnets, the test device including a vacuum chamber, at least two beam position detectors are integrated on the vacuum chamber along the accelerator beam emission direction, wherein two beam position detectors connected to the vacuum chamber are symmetrically arranged on both sides of the vacuum chamber and the center distance is adjustable; a current measurement device and a beam garbage target are coaxially arranged on the vacuum pipeline where the beam position detector is located, and an insulating sealing structure for preventing the generation of image current is arranged on the current measurement device; and a vacuum pumping device is also integrated on the vacuum chamber. The beam test device for accelerator beam debugging adopts an integrated short-distance test device without focusing or deflecting magnets. Since at least two beam position detectors are arranged, a single beam position detector can be used to measure the center position of the beam, and the two beam position detectors are symmetrically arranged on both sides of the vacuum chamber and the center distance between the two beam position detectors is adjustable. When in use, the signal delay of the two beam position detectors can be used to measure the beam flight time, and the beam energy can be calculated in combination with the distance between the two beam position detectors. Of course, multiple beam position detectors can be connected in series as needed. The current measurement device can be used to measure the beam current, while the beam garbage target is used to collect the beam and has the function of measuring the beam current. The setting of the current measurement device and the beam garbage target can realize mutual verification of the current measurement and ensure the accuracy of the measurement. Due to the integrated design, the appropriate size can be set and the overall size can be set to a short-distance structure. Therefore, there is no need to set a focusing or deflection magnet on the entire test device, which not only avoids beam loss but also simplifies the device structure. At the same time, since the test device is short and the center offset of the beam track is small, there is no need to arrange a correction magnet. Since magnets and corresponding magnet power supplies are not required, the beam test device has a simple structure and is easy to install. Only 220V AC power and cooling water from the vacuum device are required to realize offline measurement of beam intensity and beam energy. The test device can be easily and quickly installed behind the terminal where beam testing is required, which greatly expands the scope of use of the test device. When in use, the test device is docked with the accelerator outlet, and various beam tests can be performed by exhausting the gas inside the vacuum chamber through the vacuum pump. Since the test device does not carry any magnets and does not focus or deflect the beam, it can measure the beam intensity and beam energy with the simplest structure, and the test accuracy is high. In addition, the test device has a short-distance structure and a small installation space. The current intensity test device is provided with an insulating sealing structure to prevent the mirror current from being turned on, so as to avoid the mirror current from being turned on unidirectionally and affecting the current intensity measurement of ACCT. The beam current measurement device can be flexibly installed as needed.

[0018] Preferably, the vacuum chamber adopts a multi-channel structure, and at least three channels are arranged on the vacuum chamber, including a beam inlet channel and a beam outlet channel arranged on a coaxial line, and a vacuum channel. The multi-channel structure of the vacuum chamber can flexibly install the beam measurement device as needed, and has high flexibility, a wide range of applications, and strong versatility. The arrangement of the beam inlet channel and the beam outlet channel is to facilitate the docking of the two beam position detectors with the vacuum chamber, and to facilitate the adjustment of the center distance between the two beam position detectors.

[0019] Preferably, the beam position detector comprises a first beam position detector arranged on the beam entrance channel and a second beam position detector arranged on the beam exit channel; the center distance between the first beam position detector (31) and the second beam position detector is less than or equal to 440 mm. By setting the center distance between two BPMs, when the beam passes through the BPM, a signal is induced in the BPM electrode, and the signal phase difference between the two electrodes is recorded, so that the flight time of the particle passing through the two BPMs before and after can be calculated, and the particle energy can be calculated based on the distance and the flight time. The center distance between the two BPMs is less than or equal to 440 mm, which can ensure the accuracy of measurement while achieving a short distance setting.

[0020] Preferably, the current intensity measuring device is arranged at one end of the first beam position detector facing the accelerator.

[0021] Preferably, the vacuum chamber is further provided with a horizontal knife-edge flange channel for installing a fluorescent target or a wire target or a Faraday cup; and / or, the vacuum chamber is further provided with a vertical knife-edge flange channel for installing a fluorescent target or a wire target; and / or, the vacuum chamber is further provided with a vacuum gauge adapter channel.

[0022] Preferably, the vertical blade flange channel is equipped with a fluorescent target for measuring the beam spot size, or a wire target for measuring the beam cross-sectional size, or a Faraday cup for measuring the beam current intensity. Setting a fluorescent target can be used to view the beam spot shape and beam spot size. Protons bombard the fluorescent target to produce fluorescence, and a fluorescent image is obtained through an industrial camera to determine the beam spot size. Installing a wire target can be used to measure the beam cross-sectional size. When the beam passes through the wire target, a current signal will be generated on the wire due to particle deposition and secondary electron emission. Its intensity is proportional to the incident particle density. Therefore, the beam density distribution can be obtained by measuring the signal on the wire at different positions. Installing a Faraday cup can be used to measure the beam current intensity. The Faraday cup is inserted into the vacuum chamber to ensure that the center of the cup mouth coincides with the center of the beam pipe. When the beam hits the Faraday cup, the Faraday cup collects charge and generates current. The beam intensity can be measured by measuring the current signal.

[0023] Preferably, a fluorescent target for measuring the beam spot size is installed on the horizontal knife-edge flange channel, or a wire target for measuring the beam cross-sectional size is installed.

[0024] Preferably, a vacuum gauge is installed on the transfer channel. The vacuum gauge can be used to monitor the change of vacuum degree near the proton beam target. Of course, the vacuum gauge can also be set on the vacuum pipeline in front of the beam waste target. As long as a vacuum gauge is set on the test device, the change of vacuum degree near the proton beam target can be monitored.

[0025] Preferably, the total length of the test device from the accelerator outlet to the beam garbage target inlet is 1000 mm to 1090 mm.

[0026] The total length of this test device from the accelerator RFQ outlet to the beam dump target beamdump entrance is 1000mm to 1090mm. The beam transmission is analyzed by Tracewin multi-particle transmission to obtain the transmission of the beam without focusing. Since the total distance is short, there is no loss of particles in the beam pipeline, making the measurement more accurate. If the length is too short, the beam spot is not fully divergent, resulting in a small beam spot size at the terminal, high energy density, and severe local heating, which is not conducive to the heat dissipation of the terminal; if the length is too long, the beam spot diverges too much, and the beam will be lost on the vacuum tube wall in the absence of a focusing magnet. According to the beam dynamics simulation, when the test platform length is 1000mm, the beam spot diameter is about 80mm, which meets the terminal heat dissipation requirements and does not cause obvious beam loss. Therefore, it is preferred that the total length of the test device from the accelerator outlet to the beam dump target entrance is 1000mm.

[0027] Preferably, the current intensity measuring device is modularly provided with an ACCT ring, and the ACCT ring is integrated on an ACCT pipe. The current intensity measuring device mainly comprises an ACCT ring sleeved on the outer side of the beam tube wall. When the beam passes through the ACCT ring, an alternating magnetic field is induced in the coil inside the ACCT, and the alternating magnetic field induces a current in the secondary coil. The current signal can be converted into a beam signal by signal processing through electronic components, and the waveform and amplitude of the beam can be measured on an oscilloscope.

[0028] Preferably, the ACCT pipeline includes an ACCT pipeline slip-on flange, an ACCT annular fixing and an ACCT pipeline knife-edge flange.

[0029] Preferably, the insulating sealing structure includes an ACCT annular fixing, a vacuum sealing ring made of a PEEK ring, and a bolt sleeve made of a PEEK material; the vacuum sealing ring is arranged on the end face of the ACCT pipe blade flange; the bolt sleeve is arranged in the through hole of the ACCT pipe slip-on flange. When the beam passes through the vacuum tube wall, a current with the same intensity and opposite direction as the beam will be induced on the vacuum tube wall, which is called the mirror current. When the beam and the mirror current flow through the ACCT at the same time, the magnetic fields generated by the two cancel each other out, and the ACCT will not be able to measure the beam. In order to obtain an accurate beam signal, it is necessary to insulate the pipeline at a position close to the ACCT to isolate the mirror current. The vacuum sealing ring made of PEEK material is installed on the ACCT pipeline. After the flanges on both sides of the PEEK pad are installed, a gap of about 1 mm is maintained in the middle to ensure the insulation of the two flanges. At the same time, a PEEK bolt sleeve made of PEEK material is padded in the through hole on one side of the slip-on flange to ensure the insulation of the screws and the slip-on flange.

[0030] Preferably, the ACCT annular fixing piece is made of insulating material and is arranged on the ACCT pipe between the ACCT pipe slip-on flange and the ACCT pipe knife-edge flange. The ACCT annular fixing piece is made of insulating material and is used to fix the ACCT ring on the pipe while ensuring that the inner wall of the ACCT and the outer wall of the pipe are not in contact and are insulated.

[0031] Preferably, the ACCT annular fixing member is provided with four half annular bodies in a split type, each half annular body is provided with an axial extension ring, and the four ACCT annular fixing members are sleeved on the outer wall of the ACCT pipe in combination, and the extension rings at the shaft are relatively arranged to form an installation ring groove for installing the ACCT annular ring. The installation of the ACCT annular ring groove can facilitate the installation of the ACCT annular ring, and is also conducive to achieving an insulation setting.

[0032] Preferably, the test device is connected to the accelerator outlet via an adjustable connection assembly. The adjustable connection assembly is provided to facilitate adjustable connection between the test device and the accelerator outlet, to achieve center alignment, and to ensure that the beam is on the same axis without deflection or diffusion.

[0033] Preferably, the adjustable connection assembly comprises a rubber ring sealing flange body, a bellows and a bellows section knife-edge flange body, and the rubber ring sealing flange body and the bellows section knife-edge flange body are adjustably connected through a set of axial adjustment members. The adjustable connection assembly preferably uses a bellows section, one side of the bellows section is a rubber ring sealing flange for connecting to the accelerator cavity and fastened with bolts, and the other side is a knife-edge flange. The retractability of the bellows is used to facilitate the docking of the test device and the accelerator outlet, and the accuracy of the docking can be guaranteed.

[0034] Preferably, a control valve for isolating vacuum is provided at one end of the flow intensity measuring device facing the accelerator. The control valve is used to isolate vacuum, and after docking with the accelerator, vacuum isolation of the test device can be achieved, making it convenient to disassemble and assemble the test device. The control valve can be a gate valve or other valves.

[0035] Preferably, a transfer assembly is provided on the side of the control valve facing the accelerator, which is convenient for connection with the control valve and for docking with the accelerator outlet.

[0036] Preferably, the test device is arranged on the base through a plurality of adjustable pipe support frames. The adjustable pipe support frames are used to support the vacuum pipe and have an adjustment function, which can be adjusted up and down, left and right, and is convenient for pipe installation.

[0037] Preferably, the vacuum channel is connected to a vacuum device via a channel transition section, and the vacuum device is preferably a molecular pump.

[0038] Preferably, the channel transition section includes a transition section pipeline body, a transition slip-on flange and a transition fixed flange arranged at both ends of the transition section pipeline body, and a vent valve is arranged on the transition section pipeline body. The channel transition section is used to connect the vacuum pumping device and the vacuum chamber, the transition slip-on flange can conveniently adjust the installation angle of the transition flange, and the vent valve is convenient for venting the entire test device during disassembly and assembly.

[0039] Preferably, the beam position detector is provided with four electrodes equidistant from the center of the beam pipe, one above the other, one below the other, and one below the other. The BPM has four electrodes, one above the other, one below the other, and one below the other. The four electrodes are equidistant from the center of the beam pipe. When the beam passes through the BPM, a current signal is induced in the electrode. The closer the electrode is to the beam, the greater the current signal amplitude. When the beam is at the center, the signal amplitudes in the four electrodes are the same. When the beam deviates from the center, the signal amplitudes of the four electrodes are different. By monitoring the signal amplitudes of the four electrodes, the center position of the beam can be determined, thereby determining the beam position error at the RFQ exit.

[0040] Preferably, the beam junk target is coaxially connected to the beam position detector through a set of transition sections; the beam junk target includes a conical barrel and a suppression electrode. The transition section is set for connection and to increase the inner diameter to ensure that the beam will not be lost on the wall of the vacuum tube. The beam junk target can collect the beam and monitor the beam intensity. The beam junk target structure includes a conical barrel and a suppression electrode. The conical barrel is insulated from other structures. When the charged particle beam hits the conical barrel, the charge accumulates on the conical barrel and is output to an external resistor through a wire. By monitoring the voltage across the external resistor, the beam intensity hitting the conical barrel can be calculated. When protons hit the conical copper of copper, a secondary electron multiplication effect will occur. The secondary electrons generated will affect the accuracy of the beam intensity measurement. Therefore, a negative voltage is added in front of the conical barrel to suppress the influence of secondary electrons, thereby improving the measurement accuracy.

[0041] Preferably, a fourth flange of a vacuum gauge for monitoring changes in the vacuum degree near the proton beam target is provided on the transition section.

[0042] Preferably, the beam junk target is supported on the base by an adjustable beam junk target support frame. The adjustable beam junk target support frame is used for installing the beam junk target and has upper and lower adjustment bolts, which can be adjusted up and down within a certain range.

[0043] Preferably, the base is made of carbon steel, including a base bracket and a base table top. The base is made of carbon steel, and the thickness of the table top is not less than 40 mm to ensure sufficient strength.

[0044] The beneficial effects of the present invention are as follows: the beam test device for accelerator beam debugging does not have any magnets, does not focus or deflect the beam, and the test device has a simple structure, which enables the measurement of beam intensity, beam energy and beam spot size with the most simplified structure. The installation space is small, and the image current will not be unidirectionally conducted in the ACCT pipeline, so the beam measurement device can be flexibly installed as needed. The use of ACCT shortens the space required for installation, and the ACCT pipeline uses a vacuum sealing ring made of PEEK material to isolate the image current while meeting the vacuum requirements. The six-way vacuum chamber can flexibly install the beam measurement device as needed. The pipeline support frame has the ability to adjust up, down, left and right, which is convenient for pipeline alignment installation. The beam test device for accelerator beam debugging is highly flexible, widely used, and highly versatile. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 The invention is a structural schematic diagram of a beam collection test device for accelerator beam debugging.

[0046] Figure 2 It is a structural schematic diagram of another angle of the beam collection test device for accelerator beam debugging of the present invention.

[0047] Figure 3 It is a structural schematic diagram of the beam collection test device for accelerator beam debugging from a third angle of the present invention.

[0048] Figure 4 It is a structural schematic diagram of the testing device in the present invention.

[0049] Figure 5 It is a structural schematic diagram of the vacuum chamber in the present invention.

[0050] Figure 6 It is a structural schematic diagram of the channel transition section in the present invention.

[0051] Figure 7 It is a structural schematic diagram of the current intensity measuring device in the present invention.

[0052] Figure 8 It is a partial structural schematic diagram of the current intensity measuring device in the present invention.

[0053] Fig. 9 It is a structural diagram of the adjustable connection component in the present invention.

[0054] Fig.10 It is a structural schematic diagram of the beam position detector in the present invention.

[0055] Fig.11 It is a structural schematic diagram of the molecular pump in the present invention.

[0056] Fig.12 It is a structural schematic diagram of the beam garbage target in the present invention.

[0057] Fig.13 It is a structural schematic diagram of the gate valve in the present invention.

[0058] Fig.14 It is a structural schematic diagram of the pipeline support frame in the present invention.

[0059] Fig.15 It is a structural schematic diagram of the midstream garbage target support frame of the present invention.

[0060] Fig.16 It is a schematic diagram of beam sealing during the application of the accelerator beam testing device of the present invention.

[0061] Fig.17 It is a terminal beam phase diagram during the application of the accelerator beam testing device of the present invention.

[0062] Fig.18 It is a schematic diagram of particle flight distance in beam energy measurement of the present invention.

[0063] In the figure: 100, test device, 101, first transition section, 102, second transition section, 103, first transition flange, 104, second transition section flange, 105, third flange, 106, fourth flange;

[0064] 200, base, 201, base bracket, 202, base table, 203, mounting through hole, 204, extended docking portion;

[0065] 300, pipeline support frame, 301, support body, 302, lifting and lowering adjustment body, 303, centering adjustment fixing member, 304, square frame, 305, adjustment member;

[0066] 400, a supporting frame for a garbage target, 401, a supporting frame base, 402, an adjusting frame, 403, a semicircular supporting body;

[0067] 1. vacuum chamber, 11. beam inlet channel, 12. beam outlet channel, 13. vertical knife-edge flange channel, 14. horizontal knife-edge flange channel, 15. vacuum channel, 16. transfer channel, 17. transfer interface;

[0068] 18. channel transition section, 181. transition section pipe body, 182. transition slip-on flange, 183. transition fixed flange, 184. air release valve;

[0069] 2. Flow intensity measuring device, 20. Mounting ring groove, 21. ACCT ring, 22. ACCT pipeline slip-on flange, 23. ACCT ring fixing part, 24. ACCT pipeline knife-edge flange, 25. Half flange body, 26. Vacuum sealing ring, 27. Bolt sleeve, 28. Half ring body, 29. Axial extension ring;

[0070] 3. a beam position detector, 30. an electrode, 31. a first beam position detector, 32. a second beam position detector;

[0071] 4. Fluorescent target,

[0072] 5. beam trash target, 51. conical barrel, 52. suppression electrode;

[0073] 6. Molecular pump,

[0074] 7. control valve, 71. inlet pipe section, 72. outlet pipe section, 73. valve body;

[0075] 8. Adapter assembly, 81. CF40 slip-on flange body, 82. CF100 knife-edge flange body;

[0076] 9. Adjustable connection assembly, 91. Rubber ring sealing flange body, 92. Bellows, 93. Bellows section knife-edge flange body, 94. Axial adjustment piece. DETAILED DESCRIPTION

[0077] The various aspects of the present invention are described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0078] Embodiment 1:

[0079] exist Figure 1 , Figure 2 , Figure 3 , Figure 4 In the illustrated embodiment, a beam collection test device for accelerator beam debugging can be connected after the RFQ accelerator to collect the RFQ exit beam and measure the beam intensity, beam energy, beam spot size and target vacuum degree.

[0080] A beam collection test device for accelerator beam debugging includes a base 200 and a short-distance test device 100 including an integrated non-focusing or deflecting magnet. The base adopts a carbon steel structure, including a base bracket 201 and a base table 202. The base table 202 is not less than 40 mm thick to ensure sufficient strength.

[0081] The base bracket 201 is a frame structure, and a mounting space or mounting through hole 203 is provided on the plate surface of the base table 202. An extension docking portion 204 is provided at one end of the base table 202 facing the accelerator. In this embodiment, the extension docking portion 204 is a convex plate extending outwardly from the base table 202, and the convex plate extends outwardly along the center of the base table.

[0082] The base 200 may be a fixed structure, a movable structure, or an adjustable structure, and may be specifically configured according to on-site needs.

[0083] The test device 100 is integrated on the base 200. The test device 100 does not contain a focusing magnet and does not focus or deflect the beam. The test device receives the RFQ exit beam, which gradually diverges under the action of the initial divergence angle and the space charge force. Since the beam test device does not contain a focusing magnet, the longitudinal length of the test device is set to 1000mm to 1090mm, and the beam will not diverge to the vacuum pipe to cause beam loss and pipe heating. If the length is too short, the beam spot is not fully diverged, resulting in a small beam spot size at the terminal, high energy density, and severe local heating, which is not conducive to the heat dissipation of the terminal; if the length is too long, the beam spot diverges too much, and the beam will be lost on the vacuum pipe wall in the absence of a focusing magnet. According to the beam dynamics simulation, when the length of the test platform is 1000mm, the beam spot diameter is about 80mm, which meets the terminal heat dissipation requirements and does not cause obvious beam loss. Therefore, the preferred length of this embodiment is 1000mm.

[0084] The test device 100 comprises a vacuum chamber 1 connected to the accelerator outlet through a vacuum pipe, a flow intensity measuring device 2 arranged on the vacuum pipe for measuring beam intensity, at least two beam position detectors 3 (BPM) connected to the inlet and outlet of the vacuum chamber 1 for measuring beam energy, a fluorescent target 4 for monitoring beam target hitting and measuring beam spot size, a beam trash target 5 for collecting beam and measuring beam intensity, and a vacuum pumping device for evacuating the vacuum chamber. In this embodiment, the vacuum pumping device adopts a molecular pump 6 (see Fig.11 At least two beam position detectors 3 are integrated on the vacuum chamber 1 along the accelerator beam emission direction, and multiple beam position detectors 3 can be connected in series as needed.

[0085] The current intensity measuring device 2 may use an in-air ACCT alternating current transformer or a flange-ACCT alternating current transformer. In this embodiment, the current intensity measuring device 2 uses an in-air ACCT alternating current transformer.

[0086] The two beam position detectors 3 include a first beam position detector 31 disposed at the beam inlet end and a second beam position detector 32 disposed at the beam outlet end. The center distance between the first beam position detector 31 and the second beam position detector 32 can be adjusted according to test requirements, specifically by adjusting the thickness of the connecting flange, or by adding a sealing gasket, etc.

[0087] The two beam position detectors BPM are respectively mounted on the base table 202 through two pipe support frames 300, and the center distance between the first beam position detector 31 and the second beam position detector 32 is less than or equal to 440 mm. In this embodiment, the two BPMs are 440 mm apart. A single BPM can be used to measure the center position of the beam, and the signal delay of the two BPMs can be used to measure the beam flight time. Combining the distances of the two BPMs, the beam energy can be calculated.

[0088] like Fig.10 As shown, each beam position detector 3 is provided with four electrodes 30 at upper, lower, left and right sides, respectively, and the distances between the four electrodes 30 and the center of the beam pipe are equal.

[0089] Two beam position detectors BPM are arranged on the vacuum chamber along the same axis.

[0090] There is no magnetic element on the base, and the above devices are connected to each other through connecting accessories, so they can be easily installed and disassembled, thereby realizing offline beam debugging of the RFQ accelerator.

[0091] like Figure 5As shown, the vacuum chamber 1 adopts a multi-channel structure, and at least three channels are arranged on the vacuum chamber 1. In this embodiment, the vacuum chamber 1 includes six channels, specifically a beam inlet channel 11 and a beam outlet channel 12, a vertical knife-edge flange channel 13 and a horizontal knife-edge flange channel 14, a vacuum channel 15 and a transfer channel 16.

[0092] The beam entrance channel 11 and the beam exit channel 12 are arranged horizontally along the same axial direction. The inner diameters of the beam entrance channel 11 and the beam exit channel 12 are consistent with the inner diameter of the BPM. The two beam position detectors 3 (BPM) are respectively docked on the beam entrance channel 11 and the beam exit channel 12.

[0093] The vertical knife-edge flange channel 13 is equipped with a fluorescent target 4 for measuring the beam spot size, or a wire target for measuring the beam cross-sectional size, or a Faraday cup for measuring the beam current intensity. The horizontal knife-edge flange channel 14 is equipped with a fluorescent target 4 for measuring the beam spot size, or a wire target for measuring the beam cross-sectional size. The transfer channel 16 is equipped with a vacuum gauge.

[0094] The vertical knife-edge flange channel 13 and the horizontal knife-edge flange channel 14, the axis of the vertical knife-edge flange channel 13 is perpendicular to the base table 202 and perpendicular to the axis of the beam inlet channel 11 and the beam outlet channel 12. In this embodiment, the flange surface of the vertical knife-edge flange channel 13 is 185 mm away from the beam center, which can be used to install the fluorescent target 4, and monitor the beam target shooting through the fluorescent target 4. The axis of the horizontal knife-edge semi-flange channel 14 is parallel to the base table 202 and perpendicular to the axis of the beam inlet channel 11 and the beam outlet channel 12. In this embodiment, the flange surface of the horizontal knife-edge semi-flange channel 14 is 185 mm away from the beam center, which can be used to install the fluorescent target 4, and monitor the beam target shooting through the fluorescent target 4.

[0095] The vacuum channel 15 is coaxially arranged with the horizontal knife-edge semi-flange channel 14, and the axis of the vacuum channel 15 is parallel to the base table 202 and perpendicular to the axis of the beam inlet channel 11 and the beam outlet channel 12. In this embodiment, the vacuum channel 15 adopts a CF150 knife-edge flange for installing the molecular pump 6.

[0096] The full name of molecular pump 6 is turbomolecular pump. It generates pressure difference through multi-stage turbine rotation to discharge gas molecules. Since the molecular pump rotates very fast (about 38,000 rpm), when the air pressure is high, the resistance of air to the turbine blades will damage the blades. Therefore, the molecular pump needs to be started under a certain vacuum, which requires a front pump to evacuate the vacuum pipe first, and then start the molecular pump when the vacuum reaches a certain degree (<10Pa). Therefore, the molecular pump is usually used in conjunction with a mechanical pump. The molecular pump is connected to the vacuum chamber through the channel transition section, and the molecular pump exhaust port is connected to the mechanical pump through a bellows. When starting, the mechanical pump is started first, and the molecular pump is started when the vacuum is less than 10Pa.

[0097] The transfer channel 16 is coaxially arranged with the vertical knife-edge flange channel 13, and the axis of the transfer channel 16 is perpendicular to the base table 202 and perpendicular to the axis of the beam entrance channel 11 and the beam exit channel 12. In this embodiment, the transfer channel 16 adopts a CF100 flange, and a CF100 to CF40 adapter 17 is installed on the transfer channel 16. The adapter 17 can be used to install a vacuum gauge, and other components can also be installed according to actual needs.

[0098] The vacuum channel 15 is connected to a channel transition section 18 via a CF150 knife-edge flange.

[0099] The channel transition section 18 is installed on the base table 202 through a pipe support frame 300. In this embodiment, the channel transition section 18 adopts a CF150 transition section.

[0100] like Figure 6 As shown, the CF150 transition section is provided with a CF150 transition flange and a bleed valve 184, which specifically includes a transition slip-on flange 182 and a transition fixed flange 183 provided at both ends of the transition section pipeline body 181. In this embodiment, the transition slip-on flange 182 adopts a CF150 slip-on flange, which can conveniently adjust the installation angle of the transition flange. The transition fixed flange 183 adopts a CF150 fixed flange. In this embodiment, the bleed valve 184 adopts a manual bleed valve, which is provided on the transition section pipeline body 181, so as to facilitate the bleed of the entire test device during disassembly and assembly. In other embodiments, an automatic bleed valve may also be used.

[0101] In other embodiments, other beam measurement elements, such as a wire target, a Faraday cup, etc., may be installed on the vacuum chamber 1 according to actual conditions.

[0102] One end of the first beam position detector 31 facing the accelerator is connected to the flux measurement device 2 .

[0103] like Figure 7 , Figure 8As shown, the current measuring device 2 adopts a modular setting, and an insulating sealing structure is provided on the current measuring device 2 to prevent the generation of image current; the current measuring device 2 mainly includes an ACCT ring 21. The ACCT ring 21 is integrated on an ACCT pipe. The insulating sealing structure includes an ACCT ring fixing 23, a vacuum sealing ring 26 made of a PEEK ring, and a bolt sleeve 27 made of a PEEK material.

[0104] The ACCT pipeline comprises an ACCT pipeline slip-on flange 22 , an ACCT annular fixing member 23 and an ACCT pipeline knife-edge flange 24 .

[0105] The ACCT pipeline slip-on flange 22 comprises two semi-circular half-flange bodies 25 which are detachably arranged to facilitate the installation of the ACCT ring.

[0106] The ACCT pipe knife edge flange 24 is a CF100 knife edge flange for connecting to BPM. The ACCT pipe knife edge flange 24 at one end of the ACCT pipe connected to BPM uses a PEEK ring as a vacuum seal ring 26. The flanges at both ends of the PEEK ring use knife edge flanges. After the flanges are installed and docked, a vacuum seal ring 26 is used to keep a gap of about 1 mm between the two flanges to ensure insulation of the two flanges.

[0107] A bolt sleeve 27 made of PEEK material is padded in the through hole on one side of the ACCT pipe slip-on flange 22 to ensure the insulated connection between the bolt and the ACCT pipe slip-on flange 22 .

[0108] The ACCT annular fixing part 23 is arranged on the ACCT pipe between the ACCT pipe slip-on flange 22 and the ACCT pipe knife-edge flange 24. The ACCT annular fixing part 23 is arranged in a split type with four half-ring bodies 28, each half-ring body is provided with an axial extension ring 29, and the four ACCT annular fixing parts 23 are combined and sleeved on the outer wall of the ACCT pipe, and the extension ring 29 at the axis is arranged relatively to form a mounting ring groove 20, and the ACCT annular ring 21 is installed on the mounting ring groove 20 to ensure that the inner wall of the ACCT annular ring and the outer wall of the ACCT pipe are not in contact. When installing, first install and fasten the two half-ring bodies on the outer wall of the ACCT pipe, then sleeve the ACCT annular ring on the axial extension ring, and then install and fasten the other two half-ring bodies.

[0109] The end of the flow intensity measuring device 2 facing the accelerator is connected to a control valve 7 for isolating the vacuum.

[0110] like Fig.13As shown, the control valve 7 is arranged on the extended docking portion 204 of the base table. After docking with the accelerator, the vacuum isolation between the test device 100 and the accelerator can be achieved by controlling the control valve 7, which facilitates the disassembly and assembly of the test device. The control valve 7 described in this embodiment adopts a DN100 gate valve. The control valve 7 is installed on the base 200 through a pipe support frame 300 vertically arranged on the extended docking portion 204.

[0111] The control valve 7 comprises an inlet pipe section 71, an outlet pipe section 72 and a valve body 73. The inlet pipe section 71 is arranged toward one end of the accelerator.

[0112] The inlet pipe section 71 of the control valve 7 is arranged in the pipeline support frame 300 and is locked and fixed.

[0113] A transfer assembly 8 is connected to the inlet pipe section 71 of the gate valve. The transfer assembly 8 is used to realize the transition transfer function, and its specific structure can be set according to the installation requirements.

[0114] In this embodiment, the adapter assembly 8 adopts a CF40-CD100 adapter flange. The adapter assembly 8 includes a CF40 slip-on flange body 81 and a CF100 knife-edge flange body 82. The left side of the adapter assembly 8 is the CF40 slip-on flange body 81, and the right side of the adapter flange is the CF100 knife-edge flange body 82. The CF100 knife-edge flange body 82 is connected to the inlet pipe section 71 of the DN100 gate valve, and the CF40 slip-on flange body 81 is connected to an adjustable connection assembly 9 for connecting to the accelerator cavity. The adjustable connection assembly 9 is used to adjust the docking length of the vacuum pipeline to facilitate the docking of the test device 100 with the accelerator outlet. The specific structure of the adjustable connection assembly 9 can be arbitrarily selected and set according to needs without specific restrictions.

[0115] like Fig. 9 As shown, in this embodiment, the adjustable connecting assembly 9 includes a rubber ring sealing flange body 91, a bellows 92 and a bellows section blade flange body 93, the bellows 92 is arranged between the rubber ring sealing flange body 91 and the bellows section blade flange body 93, the rubber ring sealing flange body 91 and the bellows section blade flange body 93 are adjustably connected through a group of axial adjustment parts 94, and the telescopicity of the bellows 92 can facilitate the docking of the test device 100 and the accelerator outlet.

[0116] The rubber ring sealing flange body 91 is arranged on the left side of the bellows section, and is used to connect with the accelerator cavity. The rubber ring sealing flange body 91 and the accelerator cavity are fastened by bolts. The bellows section knife edge flange body 93 is arranged on the right side of the bellows section. In this embodiment, the bellows section knife edge flange body 93 adopts a CF40 knife edge flange, and is used to dock with the CF40 slip-on flange body 81 on the adapter flange 8.

[0117] The outlet pipe section 72 of the gate valve is connected to the ACCT pipeline.

[0118] The second beam position detector 32 disposed on the beam exit channel is connected to a beam dump target 5 (beam dump).

[0119] The two beam position detectors 32 are connected to the beam garbage target 5 through the first transition section 101 and the second transition section 102 in sequence.

[0120] The first transition section 101 is mounted on the base table 202 via a pipe support frame 300 .

[0121] The first transition section 101 is provided with a first transition flange 103 at both ends. In this embodiment, the first transition flange 103 adopts a CF100 flange. The inner diameter of the first transition section 101 and the first transition flange 103 is kept consistent with the inner diameter of the BPM to ensure the BPM phase measurement accuracy.

[0122] The end of the second transition section 102 connected to the first transition section 101 is provided with a second transition section flange 104, and the second transition section flange 104 adopts a CF100 flange. The end of the second transition section 102 connected to the beam garbage target 5 is provided with a third flange 105. In this embodiment, the third flange 105 adopts a CF150 flange, and the inner diameter is increased to 96 mm to ensure that the beam will not be lost on the vacuum tube wall.

[0123] A fourth flange 106 is provided on the tube body of the second transition section 102 perpendicular to the axis of the second transition section and perpendicular to the base table 202. The fourth flange 106 is a CF40 flange, which can be installed with a vacuum gauge for monitoring changes in vacuum near the proton beam target.

[0124] like Fig.12 As shown, the beam dump target 5 (beamdump) includes a conical barrel 51 and a suppression electrode 52, which is used to collect the beam and has the function of measuring the beam current intensity.

[0125] The beam trash target 5 is mounted and supported on the base table 202 through an adjustable beam trash target support frame 400 .

[0126] like Fig.15As shown, the beam dump target support frame 400 includes a support frame base frame 401, an adjustment frame 402 is arranged on the support frame base frame 401, and a semicircular support body 403 is arranged on the adjustment frame 402. The radius of the semicircular support body 403 is consistent with the radius of the beam dump interface flange, that is, it is also consistent with the radius of the third flange. The adjustment frame 402 adopts an adjustment bolt and an adjustment nut structure, and can be adjusted up and down within a range of 5 cm by adjusting the bolts up and down.

[0127] The control valve 7, the beam position detector 3, the first transition section 101 and the channel transition section 18 are supported by an adjustable pipe support frame 300 of the same structure, so as to achieve height adjustment and alignment. Of course, other components can also be provided with pipe support frames as required, and the installation of the specific device needs to be set.

[0128] like Fig.14 As shown, the pipe support frame 300 is used to realize the supporting function, and has an adjustment function, which can realize up and down, left and right adjustment, and is convenient for pipe installation. The pipe support frame 300 includes a support body 301 connected to the base 200, a lifting adjustment body 302 and a centering adjustment fixing member 303. The support body 301 is a frame structure, and the lifting adjustment body 302 is arranged above the support body 301. The lifting adjustment body 302 adopts a screw adjustment assembly to achieve adjustment. In other embodiments, other lifting adjustment methods can also be adopted. The centering adjustment fixing member 303 includes a square frame 304 and adjustment members 305 arranged on the four sides of the square frame. The adjustment member can adopt a bolt adjustment structure or other adjustment structures, as long as it can achieve the centering adjustment of the gate valve and the center of the vacuum pipe.

[0129] Beam collection and testing is performed using the beam collection and testing device for accelerator beam debugging:

[0130] 1. Beam transmission simulation test

[0131] The test device is connected to the RFQ accelerator outlet beam, and the gate valve is opened. The beam gradually diverges under the action of the initial divergence angle and the space charge force. Since the beam test device does not contain a focusing magnet, the longitudinal length of the platform cannot be too long, otherwise the beam will diverge to the vacuum pipe, causing beam loss and pipe heating. In this embodiment, the total length of the test device from the RFQ accelerator outlet to the beam dump target beam dump entrance is 1000mm.

[0132] The beam transmission is analyzed by Tracewin multi-particle transmission, and the transmission of the beam without focusing is obtained as follows: Fig.16 As shown in the beam density diagram of the accelerator beam test device, it can be seen that there is no loss of particles in the beam pipeline.

[0133] The phase diagram at the beam dump position is as follows: Fig.17 As shown in the beam phase diagram at the end of the beam test device, it can be seen that the 99.9% boundary diameter of the beam spot is about 70 mm, which is smaller than the diameter of the conical barrel mouth of the beam dump, ensuring that the beam spot can be fully hit on the beam dump target.

[0134] 2. Beam intensity measurement

[0135] The beam current test device includes two current intensity measurement devices: an in-air ACCT and a beam dump target.

[0136] The structure of the AC current transformer In-air ACCT is an ACCT ring sleeved on the outside of the beam tube wall. When the beam passes through the ACCT ring, an alternating magnetic field is induced in the coil inside the ACCT, and the alternating magnetic field induces current in the secondary coil. Through signal processing by electronic components, the current signal can be converted into a beam signal, and the waveform and amplitude of the beam can be measured on the oscilloscope.

[0137] When the beam passes through the vacuum tube wall, it will induce a current on the vacuum tube wall with the same intensity as the beam but in the opposite direction, which is called the mirror current. When the beam and the mirror current flow through the ACCT at the same time, the magnetic fields generated by the two cancel each other out, and the ACCT will not be able to measure the beam. In order to obtain an accurate beam signal, it is necessary to insulate the pipe near the ACCT to isolate the mirror current.

[0138] In this structure, a PEEK ring made of PEEK material is used as a vacuum sealing ring and installed on the right side of the ACCT pipe. After the flanges on both sides of the PEEK ring are installed, a gap of about 1mm is maintained in the middle to ensure the insulation of the two flanges. At the same time, a bolt PEEK sleeve made of PEEK material is padded in the through hole on one side of the slip-on flange to ensure the insulation of the bolt and the slip-on flange. The ACCT ring fixing is made of insulating material and is used to fix the ACCT ring on the pipe, while ensuring that the inner wall of the ACCT and the outer wall of the pipe are not in contact.

[0139] The beam dump can also monitor the beam intensity. The beam dump structure includes a conical barrel and a suppression electrode. The conical barrel is made of copper and is insulated from other structures. When the charged particle beam hits the conical barrel, the charge accumulates on the conical barrel and is output to an external resistor through a wire. By monitoring the voltage across the external resistor, the beam intensity hitting the conical barrel can be calculated.

[0140] When protons hit the copper conical barrel, a secondary electron multiplication effect will occur. The secondary electrons generated will affect the accuracy of the beam intensity measurement. Therefore, a negative voltage is added in front of the conical barrel to suppress the influence of secondary electrons and thus improve the measurement accuracy.

[0141] 3. Beam energy measurement

[0142] like Fig.18 As shown in the figure, the centers of the two BPMs are 440 mm apart. When the beam passes through the BPM, a signal is induced in the BPM electrode. By recording the phase difference of the signals of the two electrodes, the flight time of the particle passing through the two BPMs before and after can be calculated. The particle energy can be calculated based on the distance and flight time.

[0143] 4. Beam center position measurement

[0144] The BPM has four electrodes, one above, one below, one below, one below, one below, and one below. The distances from the four electrodes to the center of the beam pipe are equal. When the beam passes through the BPM, a current signal is induced in the electrodes. The closer the electrode is to the beam, the greater the current signal amplitude. When the beam is at the center, the signal amplitudes in the four electrodes are the same. When the beam deviates from the center, the signal amplitudes of the four electrodes are different. By monitoring the signal amplitudes of the four electrodes, the center position of the beam can be determined, thereby determining the beam position error at the RFQ exit.

[0145] 5. Beam spot size measurement

[0146] A fluorescent target for beam spot size measurement can be installed in the six-way vacuum chamber. Protons bombard the fluorescent target to produce fluorescence, and the fluorescent image is obtained through an industrial camera to determine the beam spot size.

[0147] The beam collection test device used for accelerator beam debugging can adjust the vacuum pipe size and the gate valve size according to actual needs. The vacuum chamber interface flange size can be adjusted and replaced according to actual needs. The vacuum chamber interface can be installed with other beam measurement components such as wire targets, Faraday cups, etc. according to actual conditions. The in-air ACCT can be replaced with flange-ACCT.

[0148] The test device does not have any magnets and does not focus or deflect the beam, which simplifies the structure of the test device and enables the platform to measure the beam intensity, beam energy and beam spot size with the simplest structure. The use of in-air ACCT shortens the space required for installation. The ACCT pipeline uses PEEK sealing rings to achieve vacuum requirements while isolating the image current. The multi-channel structure of the vacuum chamber allows the beam measurement device to be flexibly installed as needed. The pipeline support frame has the ability to adjust up and down, left and right, which is convenient for pipeline alignment installation.

[0149] The above specific implementation modes / embodiments are specific implementation modes of the present invention, which are used to illustrate the concept of the present invention, are explanatory and exemplary, and should not be interpreted as limiting the implementation modes of the present invention and the scope of the present invention. In addition to the embodiments described herein, those skilled in the art can also adopt other obvious technical solutions based on the contents disclosed in the claims and the specification of this application, and these technical solutions include any obvious replacement and modification of the embodiments described herein, which are within the protection scope of the present invention.

Claims

1. A beam test device for accelerator beam debugging, characterized in that: A short-distance test device (100) without focusing or deflecting magnets is provided in an integrated manner. The test device (100) comprises a vacuum chamber (1). At least two beam position detectors (3) are integrated on the vacuum chamber (1) along the accelerator beam emission direction, wherein the two beam position detectors (3) connected to the vacuum chamber (1) are symmetrically arranged on both sides of the vacuum chamber and the center distance is adjustable; a current measuring device (2) and a beam garbage target (5) are coaxially arranged on the vacuum pipeline where the beam position detectors (3) are located, and an insulating sealing structure for preventing the generation of image current is provided on the current measuring device (2); a vacuum pumping device and a fluorescent target for monitoring the beam target hitting condition and measuring the beam spot size are integrated on the vacuum chamber (1); the total length of the test device (100) from the accelerator outlet to the beam garbage target inlet is 1000 mm to 1090 mm.

2. The beam test device for accelerator beam debugging according to claim 1, characterized in that: The vacuum chamber (1) adopts a multi-channel structure. At least three channels are arranged on the vacuum chamber (1), including a beam inlet channel (11) and a beam outlet channel (12) arranged coaxially, and a vacuum pumping channel (15).

3. The beam testing device for accelerator beam debugging according to claim 2, characterized in that: The beam position detector (3) comprises a first beam position detector (31) arranged on the beam entrance channel (11) and a second beam position detector (32) arranged on the beam exit channel (12); the center distance between the first beam position detector (31) and the second beam position detector (32) is less than or equal to 440 mm.

4. The beam test device for accelerator beam debugging according to claim 3, characterized in that: The current intensity measuring device (2) is arranged at one end of the first beam position detector (31) facing the accelerator.

5. The beam test device for accelerator beam debugging according to claim 2, characterized in that: The vacuum chamber (1) is further provided with a horizontal knife-edge flange channel (14) for mounting a fluorescent target (4) or a wire target or a Faraday cup; and / or, the vacuum chamber (1) is further provided with a vertical knife-edge flange channel (13) for mounting a fluorescent target (4) or a wire target; and / or, the vacuum chamber (1) is further provided with a transfer channel (16) for mounting a vacuum gauge.

6. The beam test device for accelerator beam debugging according to any one of claims 1 to 5, characterized in that: The flow intensity measuring device (2) adopts a modular arrangement, wherein an ACCT ring (21) is arranged in the flow intensity measuring device (2), and the ACCT ring (21) is integrated on an ACCT pipe; The ACCT pipeline comprises an ACCT pipeline slip-on flange (22), an ACCT annular fixing member (23) and an ACCT pipeline knife-edge flange (24); The insulating sealing structure comprises an ACCT annular fixing member (23), a vacuum sealing ring (26) made of a PEEK ring, and a bolt sleeve (27) made of a PEEK material; the vacuum sealing ring (26) is arranged on the end face of the ACCT pipe knife-edge flange (24); the bolt sleeve (27) is arranged in the through hole of the ACCT pipe slip-on flange (22); the ACCT annular fixing member (23) is made of an insulating material and is arranged on the ACCT pipe between the ACCT pipe slip-on flange (22) and the ACCT pipe knife-edge flange (24).

7. The beam test device for accelerator beam debugging according to claim 6, characterized in that: The ACCT annular fixing member (23) is provided in a split manner with four half-ring bodies (28), each half-ring body being provided with an axial extension ring (29). The four ACCT annular fixing members (23) are sleeved in combination on the outer wall of the ACCT pipe, and are relatively arranged through the axial extension rings (29) to form a mounting ring groove (20) for mounting the ACCT annular ring (21).

8. The beam testing device for accelerator beam debugging according to any one of claims 1 to 5, characterized in that: The testing device (100) is connected to the accelerator outlet via an adjustable connection assembly (9).

9. The beam test device for accelerator beam debugging according to claim 8, characterized in that: The adjustable connection assembly (9) comprises a rubber ring sealing flange body (91), a bellows (92) and a bellows section knife-edge flange body (93); the rubber ring sealing flange body (91) and the bellows section knife-edge flange body (93) are adjustably connected via a set of axial adjustment members (94).

10. The beam test device for accelerator beam debugging according to any one of claims 1 to 5, characterized in that: The testing device (100) is arranged on a base (200) via a plurality of adjustable pipe support frames (300).

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