Arc-shaped superconducting magnet field measurement system and method

Abstract

The present disclosure provides an arc-shaped superconducting magnet magnetic field measurement system and method, relating to the technical field of superconducting magnet measurement, the system comprising: a cryostat for mounting the arc-shaped superconducting magnet to be measured and providing a low-temperature test environment for the arc-shaped superconducting magnet to be measured, the cryostat being provided with an arc-shaped room temperature hole; a motion track sliding through the room temperature hole, the motion track being arranged in an arc shape and having the same bending radius as the arc-shaped superconducting magnet to be measured; a driving component for driving the motion track to move along the arc line where the room temperature hole is located; and a measurement device arranged on the motion track, the measurement device being used for measuring the magnetic field parameters of the arc-shaped superconducting magnet to be measured.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of superconducting magnet measurement, and particularly relates to an arc-shaped superconducting magnet field measurement system and method. BACKGROUND

[0002] The arc-shaped superconducting magnet is a core component of the next generation of small and compact heavy ion therapy devices, and can significantly reduce the size and weight of the superconducting synchrotron and rotating gantry. The magnetic field measurement work is an important link for testing the design and processing of the magnet component. Since the arc-shaped superconducting magnet has a curved aperture, the traditional magnetic field measurement device is difficult to meet the measurement requirements. SUMMARY

[0003] In view of the above problems, the present disclosure provides an arc-shaped superconducting magnet field measurement system and method.

[0004] One aspect of the present disclosure provides an arc-shaped superconducting magnet field measurement system, comprising: a cryostat for mounting a to-be-measured arc-shaped superconducting magnet and providing a low-temperature test environment for the to-be-measured arc-shaped superconducting magnet, the cryostat being provided with an arc-shaped room temperature hole; a motion track slidingly penetrating the room temperature hole, the motion track being arranged in an arc shape and having the same bending radius as the to-be-measured arc-shaped superconducting magnet; a driving component for driving the motion track to move along the arc line where the room temperature hole is located; and a measurement device arranged on the motion track, the measurement device being configured to measure a magnetic field parameter of the to-be-measured arc-shaped superconducting magnet.

[0005] Optionally, the system further comprises an adjusting device configured to adjust the height of the motion track in a first direction, wherein the first direction is perpendicular to the ground.

[0006] Optionally, the adjusting device comprises a first scissor lift, the motion track being slidingly arranged on the top of the first scissor lift; a plurality of pulleys being rotationally arranged on the top of the first scissor lift, the plurality of pulleys being respectively located on both sides of the motion track, and the pulleys being provided with a circumferentially arranged groove in the middle portion, and the side edges of the motion track being slidingly embedded in the groove.

[0007] Optionally, the pulleys are slidingly arranged on the top of the first scissor lift and have the same sliding direction as a second direction, wherein the second direction is the direction of the radius of the motion track, and the first direction is perpendicular to the second direction; the first scissor lift is provided with a first positioning assembly, and the first positioning assembly is configured to limit the position of the pulleys on the first scissor lift.

[0008] Optionally, the first positioning assembly comprises a screw rod rotationally arranged on the first scissor lift; a sliding block threadedly assembled on the screw rod, the first scissor lift being provided with a limiting rod arranged in parallel with the screw rod, the sliding block being provided with a limiting hole for the screw rod to slidingly penetrate, the sliding block being fixedly connected with a fixed rod, and the pulley being rotationally mounted on the fixed rod.

[0009] Optionally, the driving component comprises: a mounting table, which is arranged on the ground in a liftable manner; a mounting frame, which is arranged on the mounting table in a sliding manner; a second positioning assembly, which is arranged on the mounting table and is used to limit the position of the mounting frame on the mounting table; a gear, which is arranged on the mounting frame in a rotating manner; a rack, which is arranged on the side of the movement track, and the gear is engaged with the rack; and a driving piece, which is arranged on the mounting frame and is used to drive the gear to rotate.

[0010] Optionally, the movement track is provided with multiple sections, and adjacent two sections of the movement track are fixedly connected through a connecting piece.

[0011] Optionally, the measuring device comprises: an ultrasonic motor, which is arranged on the movement track; a harmonic coil, which is connected with the output shaft of the ultrasonic motor, and the ultrasonic motor drives the harmonic coil to rotate to measure the magnetic field quality of the to-be-measured arc-shaped superconducting magnet; a plurality of Hall sensors, which are arranged in a plurality of slots arranged on a tool arranged on the movement track, the plurality of slots are arranged in a spaced manner, and the slots are arranged along a third direction, and the Hall sensors are used to measure the integral field physical quantity of the to-be-measured arc-shaped superconducting magnet at different radial positions; and a PCB type coil, which is arranged on the movement track, the PCB type coil is arranged in an arc shape and has the same bending radius as the to-be-measured arc-shaped superconducting magnet, a plurality of sub-coils are arranged on the PCB type coil, the plurality of sub-coils are arranged in a spaced manner along the radius direction of the PCB type coil, each sub-coil has the same inductive area, and the PCB type coil is used to measure the integral field transverse uniformity physical quantity of the to-be-measured arc-shaped superconducting magnet.

[0012] Optionally, the Hall sensors are arranged in multiple numbers, and the multiple Hall sensors are symmetrically arranged in the slots.

[0013] Another aspect of the present disclosure provides an arc-shaped superconducting magnet magnetic field measurement method, which is measured by using the arc-shaped superconducting magnet magnetic field measurement system, and comprises the following steps: installing the to-be-measured arc-shaped superconducting magnet in a cryostat, and making the to-be-measured arc-shaped superconducting magnet coincide with the axis of the room temperature hole; driving the movement track to move along the arc-shaped extension line of the movement track by using the driving component, and measuring the magnetic field parameters of the to-be-measured arc-shaped superconducting magnet by using the measuring device during the movement of the movement track.

[0014] The above at least one technical solution adopted by the present disclosure at least has the following beneficial effects:

[0015] The to-be-measured arc-shaped superconducting magnet is installed in the cryostat, and the magnetic field parameters can be measured by using the measuring device, the movement track and the room temperature hole, without the need to replace the measurement probe and switch the to-be-measured arc-shaped superconducting magnet between the cooling and the warming when measuring different magnetic field parameters, so that the test efficiency is greatly improved and the test cost is saved.

[0016] The system is highly integrated, the measuring device is provided with a harmonic coil, a Hall sensor and a PCB type coil, various magnetic field parameter data can be measured, comprehensive magnetic field data can be obtained, the harmonic coil, the Hall sensor and the PCB type coil can be switched at will during the measurement process, the data measurement accuracy can be improved through multiple tests;

[0017] The measuring device can be kept coplanar with the arc-shaped superconducting magnet to be measured through the adjusting device, so that the accuracy of the magnetic field data measurement is ensured.

[0018] When the system measures different specifications of arc-shaped superconducting magnets to be measured, only the corresponding motion track needs to be replaced, other components can be recycled, and the system has a certain universality and saves costs. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more completely understand the present disclosure and its advantages, reference will now be made to the following description taken in conjunction with the accompanying drawings, in which:

[0020] Figure 1 The overall structure of the arc-shaped superconducting magnet magnetic field measurement system provided by the embodiment of the present disclosure is schematically shown;

[0021] Figure 2 The structure of the adjusting device provided by the embodiment of the present disclosure is schematically shown;

[0022] Figure 3 The structure of the driving component provided by the embodiment of the present disclosure is schematically shown;

[0023] Figure 4 The structure of the second positioning assembly provided by the embodiment of the present disclosure is schematically shown;

[0024] Figure 5 The layout between the harmonic coil and the motion track provided by the embodiment of the present disclosure is schematically shown;

[0025] Figure 6 The layout between the tooling and the motion track provided by the embodiment of the present disclosure is schematically shown;

[0026] Figure 7 The layout between the PCB type coil and the motion track provided by the embodiment of the present disclosure is schematically shown;

[0027] Figure 8 The layout relationship between the arc-shaped superconducting magnet to be measured, the motion track and the measuring device provided by the embodiment of the present disclosure is schematically shown;

[0028] Figure 9 The flowchart of the arc-shaped superconducting magnet magnetic field measurement method provided by the embodiment of the present disclosure is schematically shown.

[0029] [Legend of the reference signs]

[0030] 1-cryostat; 11-room temperature hole; 12-refrigerator; 2-motion track; 21-rack; 3-driving component; 31-mounting table; 311-sliding rail; 32-mounting frame; 33-second positioning assembly; 331-positioning bolt; 34-gear; 35-driving piece; 4-measuring device; 41-ultrasonic motor; 42-harmonic coil; 43-tooling; 431-slot; 44-Hall sensor; 45-PCB type coil; 451-sub-coil; 5-adjusting device; 51-first scissor lift; 52-pulley; 53-first positioning assembly; 531-screw rod; 532-sliding block; 5321-limiting hole; 533-limiting rod; 6-connector; 61-connector plate; 62-fixing bolt; 7-arc-shaped superconducting magnet to be measured;

[0031] D1-first direction; D2-first direction; D3-third direction. DETAILED DESCRIPTION

[0032] The present application will be further described below in details with specific examples and with reference to the drawings. Obviously, the described examples are only a part of the examples of the present application, but not all the examples. Based on the examples in the present application, all the other examples obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0033] The present disclosure provides an arc-shaped superconducting magnet magnetic field measurement system. It comprises: a cryostat 1 for mounting an arc-shaped superconducting magnet to be measured 7 and providing a low-temperature test environment for the arc-shaped superconducting magnet to be measured 7, wherein an arc-shaped room temperature hole 11 is formed on the cryostat 1; a motion track 2 sliding through the room temperature hole 11, wherein the motion track 2 is arranged in an arc shape and has the same bending radius as the arc-shaped superconducting magnet to be measured 7; a driving component 3 for driving the motion track 2 to move along the arc line where the room temperature hole 11 is located; and a measuring device 4 arranged on the motion track 2, wherein the measuring device 4 is used to measure the magnetic field parameters of the arc-shaped superconducting magnet to be measured 7.

[0034] Figure 1 The overall structure of the arc-shaped superconducting magnet magnetic field measurement system provided by the present disclosure is schematically shown.

[0035] Reference Figure 1 For example, the arc-shaped superconducting magnet magnetic field measurement system can comprise a cryostat 1, a motion track 2, a driving component 3, a measuring device 4 and an adjusting device 5.

[0036] According to an embodiment of the present disclosure, the cryostat 1 is circular in cross section in the first direction, and is arranged in an arc shape along the third direction, wherein the first direction is perpendicular to the ground, the second direction is the same as the bending radius of the cryostat 1, the third direction is along the length direction of the cryostat 1, and the first direction, the second direction and the third direction are perpendicular to each other, and the top of the cryostat 1 is symmetrically provided with two refrigerators 12; two spaced apart bases are placed on the ground, and the upper part of the base is provided with a supporting groove for placing the cryostat 1. The low temperature generated by the cryostat 1 is 2K-110K. The low temperature of the cryostat 1 in the test in the embodiment of the present disclosure is 4.2K. The end surface of the cryostat 1 is provided with a room temperature hole 11 penetrating through the cryostat 1, and the room temperature hole 11 is also arranged in an arc shape, and the room temperature hole 11 is the same as the bending radius of the arc-shaped superconducting magnet 7 to be tested. The arc-shaped superconducting magnet 7 to be tested is installed in the cryostat 1, for example, the arc-shaped superconducting magnet 7 to be tested can be suspended or supported and installed in the cryostat 1. When installing, the magnet position is collimated by a high-precision spatial position measuring instrument, and installation adjustment is performed in cooperation, so that the arc-shaped superconducting magnet 7 to be tested coincides with the axis of the room temperature hole 11, and the mechanical reference of the arc-shaped superconducting magnet 7 to be tested is led out of the cryostat 1, which is convenient for establishing a spatial position coordinate system and collimating adjustment in the process of measuring the magnetic field of the arc-shaped superconducting magnet 7 to be tested. During the test, the refrigerator 12 provides a low-temperature environment for the arc-shaped superconducting magnet 7 to be tested.

[0037] Figure 2 The structure of the adjusting device provided by the embodiment of the present disclosure is schematically shown.

[0038] Referring to Figure 1 and Figure 2 According to an embodiment of the present disclosure, the motion track 2 slides through the room temperature hole 11, the motion track 2 is arranged in an arc shape, and the motion track 2 is the same as the bending radius of the arc-shaped superconducting magnet 7 to be tested.

[0039] In some embodiments, the motion track 2 can be provided in one section.

[0040] In other embodiments, the motion track 2 is provided in multiple sections, and the adjacent two motion tracks 2 are fixedly connected through the connecting piece 6.

[0041] The connecting piece 6 is a connecting plate 61, which is located on the upper surface of the motion track 2. Two groups of threaded holes are provided on the connecting plate 61, each group has a plurality of threaded holes, and the threaded holes in each group are uniformly and spacedly arranged along the bending direction of the motion track 2. The threaded holes in each group are located above the adjacent two motion tracks 2, respectively. Threaded grooves are provided on the motion track 2 corresponding to the threaded holes, and fixed bolts 62 are threadedly assembled in the threaded holes. By screwing the fixed bolts 62 into the threaded grooves, the adjacent two motion tracks 2 can be connected and fixed, so as to ensure the splicing accuracy of the plurality of motion tracks 2.

[0042] For example, the motion track 2 can be provided with three sections, and the three sections of the motion track 2 are spliced with each other to jointly form the motion track 2 with the same bending radius as the bending radius of the arc-shaped superconducting magnet 7 to be measured.

[0043] It should be noted that the number of spliced motion tracks 2 is not specifically limited in the embodiments of the present disclosure, and different numbers of motion tracks 2 can be spliced according to actual manufacturing needs.

[0044] Continuing to refer to Figure 1 and Figure 2 According to the embodiments of the present disclosure, the adjusting device 5 is used to adjust the height of the motion track 2 in the first direction, so as to level the motion track 2 and keep the measuring device 4 on the motion track 2 at the same height as the central axis of the room temperature hole 11.

[0045] Among them, the adjusting device 5 is provided in multiple groups, and the multiple groups of adjusting devices 5 are arranged at intervals along the length direction of the motion track 2.

[0046] In some embodiments, the adjusting device 5 includes a first scissor lift 51 and a plurality of pulleys 52.

[0047] Specifically, the first scissor lift 51 is fixed to the ground, wherein the first scissor lift 51 is manually adjusted, and in other embodiments, the first scissor lift 51 can also be electrically adjusted. The motion track 2 is slidingly arranged on the top of the first scissor lift 51, and the sliding direction is consistent with the bending direction of the motion track 2. By manually adjusting and retracting the first scissor lift 51, the height position of the motion track 2 in the first direction can be fixed. The plurality of pulleys 52 are arranged on the top of the first scissor lift 51, and the rotation axes of the pulleys 52 are arranged along the first direction. The plurality of pulleys 52 are respectively located on both sides of the motion track 2, and the pulleys 52 are provided with circumferentially arranged grooves in the middle. The side edges of the motion track 2 are slidingly embedded in the grooves, so that the motion track 2 is not easy to deviate in the horizontal direction while moving in the circumferential direction.

[0048] For example, three pulleys 52 are respectively arranged on each first scissor lift 51 in the embodiments of the present disclosure, one pulley 52 is located on the outer circumferential side of the motion track 2, and the other two pulleys 52 are located on the inner circumferential side of the motion track 2 and are arranged at intervals along the bending direction of the motion track 2.

[0049] It should be noted that the number of pulleys 52 is not specifically limited in the embodiments of the present disclosure, and the plurality of pulleys 52 are respectively arranged on the inner and outer sides of the motion track 2, which can achieve the limiting of the two sides of the motion track 2.

[0050] Referring to Figure 2In order to adapt the adjusting device 5 to the movement track 2 of different types (i.e. different in width in the second direction), according to the embodiment of the present disclosure, the pulley 52 is slidingly arranged on the top of the first scissor lift 51 and the sliding direction is the same as the second direction; the first scissor lift 51 is provided with a first positioning assembly 53, and the first positioning assembly 53 is used to limit the position of the pulley 52 on the first scissor lift 51.

[0051] Specifically, the first positioning assembly 53 comprises a lead screw 531 and a sliding block 532.

[0052] The lead screw 531 is rotationally arranged on the first scissor lift 51, and the rotation axis is arranged along the second direction; the sliding block 532 is threadedly assembled on the lead screw 531, and the first scissor lift 51 is provided with a limiting rod 533 which is arranged in parallel with the lead screw 531; the limiting hole 5321 is arranged on the sliding block 532 and the lead screw 531 is slidingly penetrated through the limiting hole 5321; the fixed rod is fixedly connected to the sliding block 532, and the pulley 52 is rotationally installed on the fixed rod.

[0053] It can be understood that, in use, the lead screw 531 is screwed, and the lead screw 531 drives the sliding block 532 to rotate; due to the limitation of the limiting rod 533 on the sliding block 532, the sliding block 532 reciprocally slides along the length direction of the lead screw 531. First, the pulleys 52 on both sides of the movement track 2 are moved away from each other, the movement track 2 is placed between the pulleys 52 on both sides, and then the pulleys 52 on both sides of the movement track 2 are moved close to each other, so that the both sides of the movement track 2 are respectively embedded in the grooves of the pulleys 52, and the movement track 2 is stably clamped and limited.

[0054] Figure 3 The structure schematic diagram of the driving component 3 provided by the embodiment of the present disclosure is schematically shown.

[0055] Referring to Figure 1 and Figure 3 , according to the embodiment of the present disclosure, the driving component 3 is used to drive the movement track 2 to move along the arc line where the room temperature hole 11 is located. The driving component 3 comprises a mounting table 31, a mounting frame 32, a second positioning assembly 33, a gear 34 and a driving piece 35.

[0056] Specifically, a second scissor lift is arranged on the ground corresponding to the position of the mounting table 31, and the mounting table 31 is arranged on the second scissor lift; the mounting table 31 is driven to ascend and descend by the second scissor lift, so as to adapt the driving component 3 to the motion track 2 of different heights. In order to meet the driving of the motion track 2 at different positions in the second direction, the top of the mounting table 31 is fixedly provided with two slide rails 311, the two slide rails 311 are arranged in parallel along the third direction and are arranged along the second direction, and the mounting frame 32 is provided with a sliding groove corresponding to the slide rail 311, and the slide rail 311 and the sliding groove are slidably matched. The second positioning assembly 33 is used to limit the position of the mounting frame 32 on the mounting table 31.

[0057] Figure 4 The structure schematic view of the second positioning assembly provided by the embodiment of the present disclosure is schematically shown.

[0058] Referring to Figure 3 and Figure 4 In some embodiments, the second positioning assembly 33 comprises a positioning bolt 331, the mounting frame 32 is provided with a positioning screw hole in communication with the sliding groove, and the positioning bolt 331 is threadedly assembled in the positioning screw hole. By screwing the positioning bolt 331, the free end of the positioning bolt 331 is tightly abutted against the slide rail 311, so as to fix the position of the mounting frame 32 in the second direction.

[0059] In some embodiments, the driving member 35 is a servo motor, the servo motor is fixedly installed on the mounting frame 32 and the output end faces downward, the gear 34 is fixed to the output end of the servo motor, and the outer periphery of the motion track 2 is provided with a rack 21, and the gear 34 is engaged with the rack 21.

[0060] It can be understood that the servo motor is started to drive the gear 34 to rotate, the gear 34 drives the rack 21 engaged therewith to move, and in turn drives the motion track 2 to slide in the circumferential direction.

[0061] According to the embodiment of the present disclosure, the measuring device 4 is arranged on the motion track 2, and the measuring device 4 is used to measure the magnetic field parameters of the to-be-measured arc-shaped superconducting magnet 7.

[0062] The measuring device 4 comprises an ultrasonic motor 41, a harmonic coil 42, a Hall sensor 44 and a PCB type coil 45.

[0063] Figure 5 The arrangement schematic view between the harmonic coil and the motion track provided by the embodiment of the present disclosure is schematically shown.

[0064] Referring to Figure 5In some embodiments, in order to measure the magnetic field quality of the to-be-tested arc-shaped superconducting magnet 7, the measurement is performed by the ultrasonic motor 41 and the harmonic coil 42. The ultrasonic motor 41 is arranged on the motion track 2, and the harmonic coil 42 is connected to the output shaft of the ultrasonic motor 41. The ultrasonic motor 41 drives the harmonic coil 42 to rotate to measure the magnetic field quality of the to-be-tested arc-shaped superconducting magnet 7.

[0065] Specifically, the ultrasonic motor 41 is fixed on the motion track 2 by mounting bolts, facilitating the installation and disassembly of the ultrasonic motor 41. The rotation direction of the output shaft of the ultrasonic motor 41 is parallel to the second direction.

[0066] It can be understood that, unlike general motors, the ultrasonic motor 41 adopts the inverse piezoelectric principle, which uses the inverse piezoelectric effect and ultrasonic vibration of the piezoelectric ceramic to amplify the micro deformation of the material through mechanical resonance and friction coupling to convert it into macroscopic motion of the rotor, so that it can work in an environment with a background magnetic field, ensuring that it can work normally when passing through the aperture of the to-be-tested superconducting magnet and is not affected by the background magnetic field of the to-be-tested superconducting magnet. The ultrasonic motor 41 has a small size and is installed on the motion track 2 to follow the motion of the motion track 2, and can pass through the room temperature aperture 11.

[0067] Figure 6 A schematic diagram of the arrangement between the tooling and the motion track provided by the embodiment of the present disclosure is schematically shown.

[0068] With reference to Figure 6 According to the embodiment of the present disclosure, in order to measure the integral field physical quantity of the to-be-tested arc-shaped superconducting magnet 7, the tooling 43 is bolted on the motion track 2. A plurality of slots 431 for mounting the Hall sensors 44 are arranged on the tooling 43. The plurality of slots 431 are uniformly and symmetrically arranged along the second direction, and the slots 431 are arranged along the third direction. The Hall sensors 44 are used to measure the integral field physical quantity at different radial positions of the to-be-tested arc-shaped superconducting magnet 7.

[0069] In some embodiments, a plurality of Hall sensors 44 can be symmetrically installed in the slots 431 along the second direction, so that the integral field physical quantity at different radial positions can be obtained after one arc motion of the motion track 2, thereby improving the test efficiency.

[0070] It can be understood that, during measurement, the Hall sensors 44 follow the motion track 2 to move uniformly along the curved direction, and measure the integral field, integral field transfer function and other physical quantities of the to-be-tested arc-shaped superconducting magnet 7.

[0071] Figure 7 A schematic diagram of the arrangement between the PCB type coil and the motion track provided by the embodiment of the present disclosure is schematically shown.

[0072] With reference to Figure 7, according to the embodiment of the present disclosure, in order to measure the integral field transverse uniformity physical quantity of the arc-shaped superconducting magnet 7, the PCB type coil 45 is installed on the motion track 2 by bolts, the PCB type coil 45 is arranged in an arc shape and has the same bending radius as the bending radius of the arc-shaped superconducting magnet 7 to be measured, a plurality of sub-coils 451 are arranged on the PCB type coil 45, the plurality of sub-coils 451 are arranged at intervals along the radial direction of the PCB type coil 45, each sub-coil 451 has the same inductive area, and the PCB type coil 45 is used to measure the integral field transverse uniformity physical quantity of the arc-shaped superconducting magnet 7 to be measured.

[0073] It can be understood that during the measurement process, the PCB type coil 45 moves to the center of the arc-shaped superconducting magnet 7 to be measured along with the motion track 2, a fixed trapezoidal wave is applied to the excitation current of the arc-shaped superconducting magnet 7 to be measured, and through one cycle of measurement, the integral field transverse uniformity physical quantity of the arc-shaped superconducting magnet 7 to be measured is obtained by analysis and comparison.

[0074] The system can be applied to different stages of the processing and installation of the arc-shaped superconducting magnet, and can measure the arc-shaped superconducting magnet, apply a small current (<1A) to the arc-shaped superconducting magnet at room temperature to preliminarily measure the central field, the integral field and other magnetic field parameters of the superconducting magnet; or measure the arc-shaped superconducting magnet integrated into the cryostat 1, cooperate with the room temperature hole 11 to measure the magnetic field parameters of the arc-shaped superconducting magnet in detail, and obtain the integral field uniformity and other parameters. The measurement results at room temperature and at low temperature can be compared and verified with each other, combined with the design parameters, to verify whether the design and processing of the superconducting magnet meet the physical requirements, and to propose suggestions for improvement.

[0075] In the related art, the arc-shaped superconducting magnet is tested in a vertical test mode, that is, only a single measurement mode can be used to measure a small number of magnetic field parameters during single low-temperature testing, so that the arc-shaped superconducting magnet needs to be returned to room temperature, the measurement equipment needs to be replaced, and then the arc-shaped superconducting magnet needs to be tested again at low temperature. However, in the measurement device 4 of the system, the ultrasonic motor 41, the harmonic coil 42, the Hall sensor 44 and the PCB type coil 45 are multiple measurement type devices, which are convenient to replace, simple to control, high in measurement efficiency, and can be tested multiple times during the measurement process, thereby ensuring the accuracy of the measurement data.

[0076] Meanwhile, when the system measures different specifications of the arc-shaped superconducting magnet 7 to be measured, only the corresponding specification of the motion track 2 needs to be replaced, and other components can be recycled, which has a certain universality and saves costs.

[0077] Figure 8 The layout relationship between the arc-shaped superconducting magnet to be measured, the motion track and the measurement device during measurement is schematically shown; Figure 9 The flowchart of the arc-shaped superconducting magnet magnetic field measurement method provided by the embodiment of the present disclosure is schematically shown.

[0078] Based on the same inventive concept, referring to Figure 8 and Figure 9 The embodiment of the present disclosure also provides an arc-shaped superconducting magnet magnetic field measurement method, comprising operations S110-S120.

[0079] In operation S110, the to-be-measured arc-shaped superconducting magnet 7 is installed in the cryostat 1, and the to-be-measured arc-shaped superconducting magnet 7 is aligned with the axis of the room temperature hole 11.

[0080] In operation S120, the movement track 2 is driven to move along the arc-shaped extension line of the movement track 2 by the driving component 3, and the measurement device 4 measures the magnetic field parameters of the to-be-measured arc-shaped superconducting magnet 7 during the movement of the movement track 2.

[0081] Specifically, before measurement, the cryostat 1 is first leveled, the movement track 2 is spliced and fixed, each set of adjusting devices 5 is adjusted in position with the pulley 52, the movement track 2 is stably clamped, and the two side edges of the movement track 2 can slide back and forth along the curved direction.

[0082] Then the measurement device 4 is installed, and according to different measurement contents, the ultrasonic motor 41 and the harmonic coil 42, the tooling 43 and the Hall sensor 44, and the PCB type coil 45 are respectively installed.

[0083] The height of the movement track 2 is adjusted again by the adjusting device 5 with the aid of a laser collimator instrument, and after installation, the measurement position of the measurement device 4 is aligned with the axis of the to-be-measured arc-shaped superconducting magnet 7. That is, the to-be-measured arc-shaped superconducting magnet 7, the room temperature hole 11, and the detection sensing part of the measurement device 4 are coaxial.

[0084] When the ultrasonic motor 41 is used for measurement, the ultrasonic motor 41 assembly slowly moves from the outside of the room temperature hole 11 into the room temperature hole 11 under the drive of the movement track 2, stops for a period of time every time it moves to a fixed position in the aperture of the to-be-measured arc-shaped superconducting magnet 7, at which time the ultrasonic motor 41 drives the harmonic coil 42 to rotate, collects the induced electromotive force, and further analyzes the magnetic field quality at the position. After measuring the position, the movement track 2 moves another interval distance according to the equal interval measurement and repeats the measurement step of the ultrasonic motor 41 to complete the measurement of the magnetic field quality of the entire to-be-measured arc-shaped superconducting magnet 7.

[0085] When using Hall sensor 44 to measure, install Hall sensor 44 into the pre-processed slot 431 according to the radial (i.e. second direction) position to be measured, synchronously collect the magnetic field value of the arc-shaped superconducting magnet 7 to be measured during the arc-shaped track movement, according to the actual measurement requirement, pause for 5 seconds per unit length of track movement, after the whole system tends to be stable, Hall sensor 44 collects a magnetic field value at the 5th second when the track stops moving, and collects again, until the whole range of measurement is reached, and the integral field of the arc-shaped superconducting magnet 7 to be measured is obtained after the measurement is completed.

[0086] When using PCB type coil 45 to measure, first, stably install the PCB type coil 45 at the radial center position of the arc-shaped track, before measurement, drive the arc-shaped track to move the PCB type coil 45 to the axial center of the arc-shaped superconducting magnet 7 to be measured, then excite the arc-shaped superconducting magnet 7 to be measured and pass a fixed trapezoidal wave, through one cycle of measurement, the integral field transverse uniformity physical quantity of the superconducting magnet to be measured is obtained by analysis and comparison.

[0087] The terms used herein are merely used to describe specific embodiments, and are not intended to limit the present application. The terms "include", "contain" and the like used herein indicate the existence of the described features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0088] In the present application, unless otherwise explicitly specified and limited, the terms "mount", "connect", "connect", "fix" and the like should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected or can communicate with each other; can be directly connected, or can be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0089] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "length", "circumferential", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the subsystems or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0090] Throughout the drawings, like reference numerals will be used to refer to like elements throughout the several figures. The routine structure or constitution can be omitted when it can cause confusion in understanding the present application. Also, the shape, size, positional relationship of the components in the drawings do not reflect the actual size, scale and actual positional relationship. In addition, in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. For example, such reference signs are used merely to identify certain claims as being "related" to a particular aspect of the application to which the reference signs are directed. They are not necessarily intended to be a limitation as such.

[0091] Similarly, to the extent that the above description sets forth certain implementation embodiments of the application, other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. For example, it is contemplated that the various features described herein can be implemented in hardware components, software components or combinations of the two. Furthermore, it is contemplated that features could be added to or removed from any of the described embodiments. Furthermore, several features are, for clarity, described in separate embodiments that can be implemented separately or in combination in various combinations. It is contemplated that the features described with respect to one embodiment can be combined with features described in a different embodiment. It is also contemplated that one or more features from any of the embodiments described herein can be implemented or combined in any manner.

[0092] Furthermore, the terms "first", "second", and the like, do not denote any order, quantity, combination or important / primary / secondary / tertiary status, but are used to nomenclature various components and / or elements of the application. Accordingly, the features described with respect to one embodiment can be combined with features described in a different embodiment. Also, one or more features from any of the embodiments described herein can be implemented or combined in any manner.

[0093] The specific embodiments described above are examples of the technical solutions of the present application, and it should be understood that the above description is only for specific embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A system for measuring the magnetic field of an arc-shaped superconducting magnet, characterized in that, The application relates to a low-temperature thermostat (1) for mounting an arc-shaped superconducting magnet (7) to be tested and providing a low-temperature test environment for the arc-shaped superconducting magnet (7) to be tested, wherein an arc-shaped room-temperature hole (11) is formed in the low-temperature thermostat (1); a motion track (2) is slidably arranged through the room-temperature hole (11), the motion track (2) is arranged in an arc shape and has the same bending radius as the arc-shaped superconducting magnet (7) to be tested; a driving component (3) is arranged for driving the motion track (2) to move along the arc line where the room-temperature hole (11) is located; a measuring device (4) is arranged on the motion track (2) and is used for measuring the magnetic field parameters of the arc-shaped superconducting magnet (7) to be tested, wherein the measuring device (4) comprises an ultrasonic motor (41) arranged on the motion track (2), a harmonic coil (42) connected with the output shaft of the ultrasonic motor (41), the ultrasonic motor (41) drives the harmonic coil (42) to rotate so as to measure the magnetic field quality of the arc-shaped superconducting magnet (7) to be tested, a plurality of slots (431) are formed in a tool (43) arranged on the motion track (2), a plurality of Hall sensors (44) are arranged in the slots (431), the slots (431) are arranged at intervals, and the slots (431) are arranged along a third direction, the third direction is along the length direction of the low-temperature thermostat (1), and the Hall sensors (44) are used for measuring the integral field physical quantity of the arc-shaped superconducting magnet (7) to be tested at different radial positions; a PCB type coil (45) is arranged on the motion track (2), the PCB type coil (45) is arranged in an arc shape and has the same bending radius as the arc-shaped superconducting magnet (7) to be tested, a plurality of sub-coils (451) are arranged on the PCB type coil (45), the sub-coils (451) are arranged at intervals along the radial direction of the PCB type coil (45), each sub-coil (451) has the same inductive area, and the PCB type coil (45) is used for measuring the integral field transverse uniformity physical quantity of the arc-shaped superconducting magnet (7) to be tested. The application further relates to an adjusting device (5) for adjusting the height of the motion track (2) in a first direction, wherein the first direction is perpendicular to the ground. The adjusting device (5) comprises a first scissor lifting platform (51), wherein the motion track (2) is slidably arranged on the top of the first scissor lifting platform (51); a plurality of pulleys (52) are arranged on the top of the first scissor lifting platform (51) and are arranged at two sides of the motion track (2), respectively, and a circumferential groove is formed in the middle of each pulley (52), and the side edge of the motion track (2) is slidably arranged in the groove. The pulleys (52) are slidably arranged on the top of the first scissor lifting platform (51) and have the same sliding direction as a second direction, wherein the second direction is the radial direction of the motion track (2), and the first direction is perpendicular to the second direction. ​ 2. The system of claim 1, wherein, ​ ​ 3. The system of claim 2, wherein, ​ ​ ​ 4. The system of claim 3, wherein, ​ The first scissor lifting platform (51) is provided with a first positioning assembly (53), and the first positioning assembly (53) is used for limiting the position of the pulley (52) on the first scissor lifting platform (51).

5. The system of claim 4, wherein, The first positioning assembly (53) comprises: A lead screw (531) is rotationally arranged on the first scissor lifting platform (51); A sliding block (532) is threadedly assembled on the lead screw (531), and the first scissor lifting platform (51) is provided with a limiting rod (533) arranged in parallel with the lead screw (531); a limiting hole (5321) is formed in the sliding block (532) and through which the limiting rod (533) slides; and a fixed rod is fixedly connected to the sliding block (532), and the pulley (52) is rotationally mounted on the fixed rod.

6. The system of claim 1, wherein, The driving component (3) comprises: An installation table (31) is arranged on the ground in a lifting manner; An installation frame (32) is slidingly arranged on the installation table (31); A second positioning assembly (33) is arranged on the installation table (31), and the second positioning assembly (33) is used for limiting the position of the installation frame (32) on the installation table (31); A gear (34) is rotationally arranged on the installation frame (32), and a rack (21) is arranged on the periphery of the movement track (2); the gear (34) is engaged with the rack (21); A driving member (35) is arranged on the installation frame (32), and the driving member (35) is used for driving the gear (34) to rotate.

7. The system of claim 1, wherein, The movement track (2) comprises multiple segments, and adjacent two segments of the movement track (2) are fixedly connected through a connecting piece (6).

8. The system of claim 1, wherein, The Hall sensor (44) comprises multiple pieces, and the multiple pieces of the Hall sensor (44) are symmetrically arranged in the slot (431).

9. A method of measuring a magnetic field of an arc-shaped superconducting magnet, using the system for measuring a magnetic field of an arc-shaped superconducting magnet according to any one of claims 1 to 8, characterized by, Comprise: The to-be-measured arc-shaped superconducting magnet (7) is installed in the cryostat (1), and the to-be-measured arc-shaped superconducting magnet (7) is coaxial with the axis of the room temperature hole (11); The movement track (2) is driven by the driving component (3) to move along the arc-shaped extension line of the movement track (2), and the measurement device (4) measures the magnetic field parameters of the to-be-measured arc-shaped superconducting magnet (7) during the movement of the movement track (2).

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