Multifunctional beam current testing device

Abstract

The utility model discloses a multifunctional beam testing device, which comprises a vacuum chamber with a multichannel structure, at least three channels are arranged on the vacuum chamber, two of the channels are arranged to be a beam inlet channel and a beam outlet channel along a coaxial line, and the beam inlet channel and the beam outlet channel are communicated with each other. The beam inlet channel and the beam outlet channel are respectively provided with a beam position detector. According to the multifunctional beam testing device, the plurality of channels are arranged on the vacuum chamber, different measuring devices can be in butt joint on the channels according to measurement requirements so as to meet the requirements of different functional measurement, short-distance transmission measurement of beams can be achieved through the vacuum chamber, a gathering or deflecting magnet does not need to be arranged, beam loss is avoided, and the measurement accuracy is improved. And the structure of the device is simplified. The testing device can be conveniently and rapidly installed behind a terminal needing beam current testing, and the application range of the testing device is greatly expanded. And the universal design requirement of the testing device is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical equipment technical field, concretely relates to a multifunctional beam test device. BACKGROUND

[0002] The beam commissioning of the accelerator is an important work before the formal operation of the accelerator, and the commissioning personnel determines the working state of the accelerator by measuring the beam parameters at the outlet of the accelerator, and feeds back the measurement results to the beam commissioning, so that the accelerator reaches the best working state and realizes high-quality beam acceleration and transmission.

[0003] The beam commissioning of the accelerator includes online beam commissioning and offline beam commissioning.

[0004] The online beam commissioning refers to the measurement and monitoring of the beam by the beam monitoring and diagnosis system installed on the beam transmission line after the installation of the accelerator and the beam transmission line, so as to realize the beam commissioning of the whole accelerator and beam transmission system.

[0005] For online testing, the accelerator beam commissioning needs to be performed after the installation of the beam transmission line, but after the introduction of the beam transmission line, the variables of the beam commissioning increase, the commissioning difficulty increases, and the outlet beam of the accelerator cannot be measured alone. In order to reduce the commissioning difficulty, the optimal solution is to use offline commissioning as much as possible. Offline beam commissioning is to separately commission the accelerator before the completion of the installation of the system.

[0006] During the offline beam commissioning of the accelerator, the beam transmission line behind the accelerator is not installed, so a test device for collecting and monitoring the beam is needed, and the test device is installed at the end of the accelerator, so as to realize the offline beam commissioning of the accelerator.

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

[0008] Since there are many monitorable beam parameters in beam adjustment, including current, energy, emittance, beam spot size, twiss parameter, energy spread, etc.

[0009] For the offline test device, key beam parameters need to be selected for measurement, and if too many monitoring indicators are selected, the test device will be too large and complex, the installation difficulty and processing cost will be increased, and higher requirements will be put forward for the installation space. Therefore, appropriate beam parameters need to be selected for offline measurement.

[0010] The beam current and the beam energy are the most important parameters, the beam current can reflect the transmission efficiency of the accelerator, the beam energy can reflect whether the particles are accelerated correctly, and the transmission efficiency and the beam energy can greatly reflect the working state of the accelerator. Therefore, the beam current and the beam energy are preferred as the main parameters of the offline measurement to design the offline test device.

[0011] The existing offline test device needs to set up a magnet element for focusing or deflecting the beam. At present, the magnet of the beam test platform usually includes:

[0012] 1) Quadrupole magnet: The quadrupole magnet generates a uniform gradient transverse magnetic field to focus and defocus the beam. The beam will gradually diverge outward under the action of the space charge force in the transmission process. When the beam test platform is long, the transverse focusing force needs to be applied to the beam to refocus the beam, otherwise the beam will 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 the 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 outlet 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 spread can be measured.

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

[0015] Since the existing offline test device needs to set up a magnet element, the test device structure is complex, occupies a large installation space, and after the test device is set up, the beam measurement device cannot be flexibly disassembled according to the needs, and the diversification design requirements of the test device cannot be met. At the same time, the existing test device will generate mirror current during measurement, which affects the measurement accuracy. Invention content

[0016] The utility model discloses a multifunctional beam test device, which does not use a magnet element and does not need to focus or deflect a beam, adopts a multi-channel structure vacuum chamber, sets multiple channels on the vacuum chamber, can connect different measuring devices on the channels according to the measuring needs, meets the needs of different function measurements, sets two beam position detectors, a single beam position detector can be used for measuring a beam center position, the two beam position detectors are symmetrically arranged on two sides of the vacuum chamber, the time delay of the two beam position detector signals can be used for measuring a beam flight time, and the beam energy can be calculated in combination with the distance of the two beam position detectors. The short-distance transmission measurement of the beam can be realized through the vacuum chamber, the focusing or deflecting magnet does not need to be set, the beam loss is avoided, and the device structure is simplified. Meanwhile, since the test device is short and the beam track center offset is small, a correction magnet does not need to be arranged. Since the magnet and the corresponding magnet power supply are not needed, the beam test device structure is simple, the test device can be conveniently and quickly installed behind a terminal where the beam test is needed, and the use range of the test device is greatly expanded. When in use, the test device is connected with an accelerator outlet, the gas in the vacuum chamber is discharged through the molecular pump, and the beam data test can be realized. The device has small installation space, can flexibly install the beam measuring device according to the needs, and meets the general design requirements of the test device.

[0017] The utility model discloses a multifunctional beam test device, which does not use a magnet element and does not need to focus or deflect a beam, adopts a multi-channel structure vacuum chamber, sets multiple channels on the vacuum chamber, can connect different measuring devices on the channels according to the measuring needs, meets the needs of different function measurements, sets two beam position detectors, a single beam position detector can be used for measuring a beam center position, the two beam position detectors are symmetrically arranged on two sides of the vacuum chamber, the time delay of the two beam position detector signals can be used for measuring a beam flight time, and the beam energy can be calculated in combination with the distance of the two beam position detectors. The short-distance transmission measurement of the beam can be realized through the vacuum chamber, the focusing or deflecting magnet does not need to be set, the beam loss is avoided, and the device structure is simplified. Meanwhile, since the test device is short and the beam track center offset is small, a correction magnet does not need to be arranged. Since the magnet and the corresponding magnet power supply are not needed, the beam test device structure is simple, the test device can be conveniently and quickly installed behind a terminal where the beam test is needed, and the use range of the test device is greatly expanded. When in use, the test device is connected with an accelerator outlet, the gas in the vacuum chamber is discharged through the molecular pump, and the beam data test can be realized. The device has small installation space, can flexibly install the beam measuring device according to the needs, and meets the general design requirements of the test device.

[0018] As a preferred, the vacuum chamber is further provided with a horizontal knife flange channel and / or a vertical knife flange channel and / or an adapter channel.

[0019] As preferred, the vertical knife-edge flange channel is provided with a fluorescent target for measuring the beam spot size, or a wire target for measuring the beam cross-section size, or a Faraday cup for measuring the beam current.

[0020] As preferred, the horizontal knife-edge flange channel is provided with a fluorescent target for measuring the beam spot size, or a wire target for measuring the beam cross-section size.

[0021] As preferred, the adapter channel is provided with a vacuum gauge. The vacuum gauge can be used to monitor the vacuum change near the proton beam target. Of course, the vacuum gauge can also be arranged on the vacuum pipeline in front of the beam dump target. As long as a vacuum gauge is arranged on the test device, the vacuum change near the proton beam target can be monitored.

[0022] As preferred, the beam position detector where the beam exit channel is located is coaxially connected with a beam dump target through a set of transition sections. The transition sections are arranged for connection and to increase the inner diameter to ensure that the beam will not be lost on the vacuum pipe wall. The beam dump target can collect the beam and monitor the beam current. The beam dump target structure includes a tapered barrel and a suppression electrode, and the tapered barrel is insulated from other structures. When the charged particle beam hits the tapered barrel, the charge accumulates on the tapered barrel and is output to an external resistor through a wire. By monitoring the voltage across the external resistor, the beam current hitting the tapered barrel can be calculated. The secondary electron multiplication effect occurs when the proton hits the tapered copper barrel, and the generated secondary electrons will affect the accuracy of the beam current measurement. Therefore, a negative voltage is added in front of the tapered barrel to suppress the influence of secondary electrons, thereby improving the measurement accuracy.

[0023] As preferred, the transition section is further provided with a fourth flange of a vacuum gauge for monitoring the vacuum change near the proton beam target.

[0024] As preferred, the beam dump target is supported on the base through an adjustable beam dump target support frame. The adjustable beam dump target support frame is used for the installation of the beam dump target and is provided with up and down adjustment bolts for up and down adjustment within a certain range.

[0025] As preferred, the testing device is arranged on the base through several adjustable pipe support frames.

[0026] As preferred, the pipe support frame comprises a support body for connecting with the base, a lifting adjusting body and a centering adjusting fixing member.

[0027] As preferred, the support body is a frame structure, the lifting adjusting body is arranged above the support body, and the centering adjusting fixing member comprises a square frame and adjusting members arranged on four sides of the square frame.

[0028] As preferred, a molecular pump channel for connecting a molecular pump is arranged on the vacuum chamber.

[0029] As preferred, a molecular pump is connected to the molecular pump channel through a channel transition section.

[0030] As preferred, the channel transition section comprises a transition section pipe body, transition sleeve flanges and transition fixing flanges arranged at two ends of the transition section pipe body, and a vent valve is arranged on the transition section pipe body.

[0031] The multifunctional beam current testing device has the advantages that: multiple channels are arranged on the vacuum chamber, different measuring devices can be connected to the channels according to measuring needs, so that the needs of different function measurements are met, short-distance transmission measurement of beam current can be realized through the vacuum chamber, no gathering or deflection magnet needs to be arranged, beam current loss is avoided, and the device structure is simplified. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a structural schematic view of the multifunctional beam current testing device.

[0033] Figure 2 is a structural schematic view of the multifunctional beam current testing device from another angle.

[0034] Figure 3 is an application structural schematic view of the multifunctional beam current testing device.

[0035] Figure 4 is a top view of the vacuum chamber. Figure 3

[0036] Figure 5 is a structure schematic view of the pipeline support frame in the utility model.

[0037] Figure 6 is a structure schematic view of the pipeline support frame in the utility model.

[0038] Figure 7 is a structure schematic view of the flowing garbage target support frame in the utility model.

[0039] 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;

[0040] 200, base, 201, bottom plate;

[0041] 300, pipeline support frame, 301, support body, 302, lifting adjustment body, 303, centering adjustment fixing piece, 304, square frame, 305, adjustment piece;

[0042] 400, flowing garbage target support frame, 401, support frame chassis, 402, adjustment frame, 403, semicircular support body;

[0043] 1, vacuum chamber, 11, beam inlet channel, 12, beam outlet channel, 13, vertical knife flange channel, 14, horizontal knife flange channel, 15, molecular pump channel, 16, switching channel, 17, switching port;

[0044] 18, channel transition section, 181, transition section pipeline body, 182, transition lap joint flange, 183, transition fixed flange, 184, air release valve;

[0045] 2, flowing intensity measuring device;

[0046] 3, beam position detector, 30, electrode, 31, first beam position detector, 32, second beam position detector;

[0047] 4, fluorescent target,

[0048] 5, beam garbage target, 51, conical barrel, 52, suppression electrode;

[0049] 6, molecular pump,

[0050] 7, vacuum gauge. DETAILED DESCRIPTION

[0051] ​The various aspects of the present application are described in detail below with reference to specific embodiments and to the accompanying drawings.

[0052] Embodiment 1:

[0053] In Figure 1 , Figure 2 , Figure 3 , Figure 4 In the embodiment shown, a multifunctional beam test device can be connected after an RFQ accelerator, collects the RFQ outlet beam, and measures various data such as beam intensity, beam energy, beam spot size, and target vacuum degree.

[0054] A multifunctional beam test device, the test device 100 comprises a multi-channel structure vacuum chamber 1, the vacuum chamber 1 is arranged on a base 200.

[0055] The base adopts a carbon steel structure, comprising a bottom plate 201, the thickness of the bottom plate 201 is not less than 40mm, so as to ensure sufficient strength.

[0056] The base 200 can adopt a fixed structure, or a mobile structure, or an adjustable structure, can adopt a wheel structure, or a frame structure, and can be set according to the needs of the scene.

[0057] The test device 100 is integrated on the base 200, the test device 100 does not contain focusing magnets, and does not focus or deflect the beam. The test device receives the RFQ outlet beam, and the beam gradually diverges under the action of the initial scattering angle and the space charge force. Since the beam test device does not contain focusing magnets, the beam will not diverge to the vacuum pipeline, causing beam loss and pipeline heating.

[0058] The vacuum chamber 1 is provided with at least three channels, two of which are coaxially arranged as a beam inlet channel 11 and a beam outlet channel 12, and a beam position detector 3 (BPM) is arranged on the beam inlet channel 11 and the beam outlet channel 12. According to the needs, a plurality of beam position detectors 3 can be connected in series. The vacuum chamber 1 is provided with a molecular pump channel 15 for connecting a molecular pump 6.

[0059] The molecular pump channel 15 is connected with the molecular pump 6 through a channel transition section 18. The molecular pump 6 is a turbo molecular pump, which generates pressure difference through multi-stage turbine rotation to discharge gas molecules. Because the molecular pump rotates at a very high speed (about 38000 rpm), when the air pressure is high, the resistance of air to the turbine blades will cause the blades to be damaged. Therefore, the molecular pump needs to be started under a certain vacuum, which requires a front pump to first pump the vacuum pipeline to a certain degree of vacuum (<10 Pa) before starting the molecular pump. Therefore, the molecular pump is usually used together with a mechanical pump. The molecular pump is connected with the vacuum chamber through the channel transition section, and the molecular pump exhaust port is connected with the mechanical pump through a corrugated pipe. When starting, the mechanical pump is started first, and the molecular pump is started when the vacuum is less than 10 Pa.

[0060] The two beam position probes 3 include a first beam position probe 31 arranged at the beam inlet end and a second beam position probe 32 arranged at the beam outlet end. The center distance between the first beam position probe 31 and the second beam position probe 32 can be adjusted according to the test needs. Specifically, the center distance can be adjusted by the thickness of the connecting flange, or can be adjusted by adding a sealing gasket and the like.

[0061] The two beam position probes BPM are respectively installed on the bottom plate 201 through two pipeline support frames 300. The center distance between the first beam position probe 31 and the second beam position probe 32 is less than or equal to 440 mm. In the embodiment, the distance between the two BPMs is 440 mm. A single BPM can be used to measure the beam center position, and the time delay of the two BPM signals can be used to measure the beam flight time. Combined with the distance between the two BPMs, the beam energy can be calculated.

[0062] Each beam position probe 3 is respectively provided with four electrodes 30 in the up, down, left and right directions. The distances from the four electrodes 30 to the center of the beam pipeline are equal.

[0063] The base is not provided with a magnet element. The above devices are connected with each other through connecting fittings, can be conveniently installed and disassembled, and realize offline beam debugging of the RFQ accelerator.

[0064] As shown in Figure 5 The vacuum chamber 1 adopts a multi-channel structure. In the embodiment, the vacuum chamber 1 includes six channels. In addition to the beam inlet channel 11 and the beam outlet channel 12, and the molecular pump channel 15, the vertical knife flange channel 13, the horizontal knife flange channel 14 and the adapter channel 16 are also provided.

[0065] The beam inlet channel 11 and the beam outlet channel 12 are arranged in the same axial direction, and the inner diameters of the beam inlet channel 11 and the beam outlet channel 12 are consistent with the inner diameter of the BPM.

[0066] In use, the vertical knife flange channel 13 is provided 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.

[0067] The vertical knife flange channel 13 and the horizontal knife flange channel 14, the axis of the vertical knife flange channel 13 is perpendicular to the bottom plate 201 and the axis of the beam inlet channel 11 and the beam outlet channel 12, in the embodiment, the flange surface of the vertical knife flange channel 13 is 185mm away from the beam center, and the fluorescent target 4 can be installed on the flange surface to monitor the beam hitting condition.

[0068] The molecular pump channel 15 is coaxial with the horizontal knife flange channel 14, and the axis of the molecular pump channel 15 is parallel to the bottom plate 201 and perpendicular to the axis of the beam inlet channel 11 and the beam outlet channel 12, in the embodiment, the molecular pump channel 15 adopts a CF150 knife flange for installing the molecular pump 6.

[0069] The adapter channel 16 is coaxial with the vertical knife flange channel 13, and the axis of the adapter channel 16 is perpendicular to the bottom plate 201 and perpendicular to the axis of the beam inlet channel 11 and the beam outlet channel 12, in the embodiment, the adapter channel 16 adopts a CF100 flange, and a CF100-CF40 adapter 17 is installed on the adapter channel 16, which can be used to install the vacuum gauge 7 or other elements according to actual needs.

[0070] The molecular pump channel 15 is connected with a channel transition section 18 through the CF150 knife flange.

[0071] The channel transition section 18 is installed on the bottom plate 201 through a pipeline support frame 300. In this embodiment, the channel transition section 18 adopts a CF150 transition section.

[0072] The CF150 transition section is provided with a CF150 transition flange and a gas release valve 184, and specifically includes a transition live-joint flange 182 and a transition fixed flange 183 arranged at two ends of the transition section pipeline body 181. In this embodiment, the transition live-joint flange 182 adopts a CF150 live-joint flange, which can facilitate adjustment of the installation angle of the transition flange. The transition fixed flange 183 adopts a CF150 fixed flange. In this embodiment, the gas release valve 184 adopts a manual gas release valve, which is arranged on the transition section pipeline body 181 and facilitates release of air in the entire test device during disassembly. In other embodiments, an automatic gas release valve can also be adopted.

[0073] In other embodiments, other beam current measurement elements such as a wire target and a Faraday cup can be installed on the vacuum chamber 1 according to actual conditions.

[0074] The first beam position probe 31 can also be connected to the current strength measurement device 2 at one end facing the accelerator. The current strength measurement device 2 is used to measure the current strength. The current strength measurement device can adopt an in-air ACCT alternating current transformer or a flange-ACCT alternating current transformer.

[0075] The second beam position probe 32 arranged on the beam outlet channel is connected to the beam dump 5.

[0076] The second beam position probe 32 is sequentially connected to the beam dump 5 through the first transition section 101 and the second transition section 102.

[0077] The first transition section 101 is installed on the bottom plate 201 through a pipeline support frame 300.

[0078] Both ends of the first transition section 101 are provided with first transition flanges 103. In this embodiment, the first transition flanges 103 adopt CF100 flanges. The inner diameters of the first transition section 101 and the first transition flanges 103 are kept consistent with the inner diameter of the BPM, thereby ensuring the phase measurement accuracy of the BPM.

[0079] The second transition section 102 is provided with a second transition section flange 104 at the end connected to the first transition section 101. The second transition section flange 104 adopts a CF100 flange. The second transition section 102 is provided with a third flange 105 at the end connected to the beam dump 5. In this embodiment, the third flange 105 adopts a CF150 flange, and the inner diameter is increased to 96 mm, thereby ensuring that the beam will not be lost on the wall of the vacuum tube.

[0080] 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 plate 201. The fourth flange 106 is a CF40 flange, which can be fitted with a vacuum gauge to monitor the change in vacuum near the proton beam target.

[0081] The beamdump includes a conical barrel 51 and a suppression electrode 52, which are used to collect beams and also have the function of measuring beam intensity.

[0082] The beam debris target 5 is mounted and supported on the base plate 201 by an adjustable beam debris target support frame 400.

[0083] like Figure 7 As shown, the beam dump target support frame 400 includes a support frame base 401, on which an adjustment frame 402 is mounted. A semi-circular support body 403 is mounted on the adjustment frame 402. The radius of the semi-circular support body 403 is the same as the radius of the beam dump interface flange, i.e., the same as the radius of the third flange. The adjustment frame 402 uses an adjusting bolt and adjusting nut structure, allowing for vertical adjustment within a 5cm range via the upper and lower adjusting bolts.

[0084] 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 with identical structure, thereby achieving height adjustment and alignment. Of course, other components can also be equipped with pipe support frames as needed, and the specific installation of the device requires specific configuration.

[0085] like Figure 6 As shown, the pipe support frame 300 provides support and is adjustable, allowing for vertical and horizontal adjustments to facilitate pipe installation. The pipe support frame 300 includes a support body 301 for connection to the base 200, a lifting and adjusting body 302, and a centering adjustment fixing member 303. The support body 301 is a frame structure. The lifting and adjusting body 302 is positioned above the support body 301 and is adjusted using a screw adjustment assembly. Other lifting and adjusting methods may be used in other embodiments. The centering adjustment fixing member 303 includes a square frame 304 and adjusting members 305 positioned on the four sides of the square frame. The adjusting members can be bolt-adjusted or other adjustment structures, as long as they can achieve centering adjustment between the slide gate valve and the vacuum pipeline.

[0086] Beam collection and testing are performed using this multifunctional beam testing device.

[0087] 1. Beam transmission simulation test

[0088] The test device is connected to the RFQ accelerator exit beam. The beam gradually diverges under the influence of the initial divergence angle and space charge force. Since the beam test device does not contain a focusing magnet, the total length of this test device from the RFQ accelerator exit to the beamdump entrance is 1100 mm.

[0089] The beam transmission was analyzed using Tracewin multi-particle transport to obtain the beam transmission under unfocused conditions. The beam density measurement results from the accelerator beam test device showed that there was no particle loss in the beam channel.

[0090] The beam results from the beam testing device terminal show that the 99.9% boundary diameter of the beam spot is approximately 70 mm, which is smaller than the diameter of the cone-shaped barrel opening of the beam dump, ensuring that the entire beam spot can hit the beam dump target.

[0091] 2. Beam intensity measurement

[0092] This beam testing device can be equipped with two current intensity measurement devices: an in-air ACCT and a beam dump.

[0093] An in-air ACCT (Alternating Current Transformer) induces an alternating magnetic field in the coil inside the ACCT when the beam current passes through it. This alternating magnetic field then induces a 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 current can be measured on an oscilloscope.

[0094] Beam dumps can also monitor beam intensity. A beam dump structure consists of a conical barrel and suppression electrodes. The conical barrel is made of copper and is insulated from other structures. When a charged particle beam hits the conical barrel, the charge accumulates and is output to an external resistor via wires. By monitoring the voltage across the external resistor, the beam intensity hitting the conical barrel can be calculated.

[0095] When protons strike a copper conical barrel, they produce a secondary electron multiplication effect. These secondary electrons can affect the accuracy of beam intensity measurement. Therefore, a negative voltage is applied in front of the conical barrel to suppress the influence of secondary electrons, thereby improving measurement accuracy.

[0096] 3. Beam Energy Measurement

[0097] like Figure 4 As shown, the centers of the two BPMs are 440 mm apart. When the beam passes through the BPMs, a signal is induced in the BPM electrodes. By recording the phase difference between the signals from the two electrodes, the flight time of the particle after passing through the two BPMs can be calculated. Based on the distance and flight time, the particle energy can be calculated.

[0098] 4. Beam center position measurement

[0099] BPM has four electrodes up and down and left and right, the distance from the four electrodes to the center of the beam tube is equal, the beam will induce current signals in the electrodes when passing through the BPM, the closer the electrode is to the beam, the greater the current signal amplitude. When the beam is in 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 beam center position can be determined, thereby determining the RFQ outlet beam position error.

[0100] 5. Beam spot size measurement

[0101] A fluorescent target for beam spot size measurement can be installed in the six-way vacuum chamber, protons hit the fluorescent target to produce fluorescence, and the fluorescence image is obtained by an industrial camera to determine the beam spot size.

[0102] The multifunctional beam test device, the size of the vacuum chamber interface flange can be adjusted and replaced according to actual needs. The vacuum chamber interface can be installed with other beam measurement elements according to actual conditions, such as a wire target, a Faraday cup, etc. The in-air ACCT can be replaced with a flange-ACCT.

[0103] The test device does not have any magnet and does not focus or deflect the beam, simplifying the structure of the test device, so that the platform realizes measuring beam current, beam energy and beam spot size data with the simplest structure. The use of in-air ACCT shortens the space required for installation, and the multi-channel structure of the vacuum chamber can flexibly install the beam measurement device according to needs. The pipe support frame has up and down and left and right adjustment capabilities, facilitating pipe collimation installation.

[0104] The above specific embodiments / examples are specific embodiments of the present application, used to illustrate the concept of the present application, and are explanatory and exemplary, and should not be interpreted as limiting the embodiments of the present application and the scope of the present application. In addition to the embodiments described herein, those skilled in the art can also use other technical solutions that are obvious based on the disclosure of the claims and the specification of the present application. These technical solutions include technical solutions that make any obvious substitutions and modifications to the embodiments described herein, and are within the scope of the present application.

Claims

1. A multi-functional beam test apparatus, characterized by: The vacuum chamber (1) comprises a multi-channel structure, and at least three channels are arranged on the vacuum chamber (1), wherein two channels are arranged along the same axis as a beam inlet channel (11) and a beam outlet channel (12), and a beam position detector (3) is arranged on the beam inlet channel (11) and the beam outlet channel (12) respectively; and a molecular pump (6) is connected to the vacuum chamber (1).

2. The multi-functional beam test device of claim 1, wherein: The vacuum chamber (1) is further provided with a horizontal knife flange channel (14) and / or a vertical knife flange channel (13) and / or an adapter channel (16).

3. The multi-functional beam test device of claim 2, wherein: The vertical knife flange channel (13) is provided 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.

4. The multi-functional beam test device of claim 2, wherein: The horizontal knife flange channel (14) is provided with a fluorescent target (4) for measuring the beam spot size, or a wire target for measuring the beam cross-sectional size.

5. The multi-functional beam test device of claim 2, wherein: The adapter channel (16) is provided with a vacuum gauge.

6. The multi-functional beam test device according to any one of claims 1 to 5, characterized in that: The beam position detector (3) on which the beam outlet channel (12) is arranged is coaxially connected to a beam dump target (5) through a set of transition sections.

7. The multi-functional beam test device of claim 6, wherein: The transition section is further provided with a fourth flange (106) of a vacuum gauge for monitoring the change of vacuum degree near the proton beam hitting.

8. The multi-functional beam test apparatus according to any one of claims 1 to 5, characterized by: The beam dump target (5) is supported on a base (200) through an adjustable beam dump target support frame (400).

9. The multi-functional beam test device of claim 8, wherein: The test device (100) is arranged on the base (200) through a plurality of adjustable pipe support frames (300).

10. The multi-functional beam test device of claim 9, wherein: The pipe support frame (300) comprises a support body (301) for connecting with the base (200), a lifting adjustment body (302) and a centering adjustment fixing member (303). The support body (301) is a frame structure, the lifting adjustment body (302) is arranged above the support body (301), and the centering adjustment fixing member (303) comprises a square frame (304) and adjustment members (305) arranged on four sides of the square frame.

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