High-field high-uniformity magnetic measurement device for fusion large-aperture long-distance superconducting magnet

Abstract

The invention discloses a high-field high-uniformity magnetic measurement device for a fusion large-aperture long-distance superconducting magnet, and relates to the technical field of superconducting magnet magnetic field measurement. The device comprises a support frame, a transfer connection support rod, a multi-angle uniformly-distributed magnetic measurement disc, a long-distance magnetic measurement rod and a three-dimensional Hall probe, the two supporting frames are arranged at the two ends of the device respectively, the transfer connecting supporting rod is connected between the supporting frames and the multi-angle evenly-distributed magnetic measurement disc, the three-dimensional Hall probe is installed on the long-distance magnetic measurement rod, and the long-distance magnetic measurement rod can move in the radial direction and the axial direction of the multi-angle evenly-distributed magnetic measurement disc. The magnetic field measuring device and the magnetic field measuring method are respectively used for measuring magnetic fields at different radial positions and measuring axial distribution of the magnetic fields. The device is designed according to the high-precision magnetic field measurement requirement of the superconducting magnet, has the advantages of being stable in structure and small in deformation, can meet complex magnetic field measurement conditions, and can provide key data support for optimization design of a fusion device.

Description

Technical Field

[0001] This invention relates to the field of superconducting magnet magnetic field measurement technology, specifically to a high-field, high-uniformity magnetic field measurement device for large-aperture, long-distance superconducting magnets used in fusion. Background Technology

[0002] Fusion energy, as a promising clean energy source, hinges on its ability to confine high-temperature, high-density plasma. Superconducting magnets play a crucial role in fusion devices, generating powerful steady-state magnetic fields to confine the plasma, thereby achieving controlled nuclear fusion. For large, long-distance superconducting magnets, their design and manufacturing precision directly affect the uniformity and strength of the magnetic field, thus influencing plasma confinement efficiency and fusion performance. Therefore, high-precision, comprehensive magnetic field measurements of superconducting magnets are essential during the construction and operation of fusion devices.

[0003] Currently, magnetic field measurements of superconducting magnets typically employ measuring elements such as Hall effect sensors or fluxgate sensors, using various methods to perform spatial scanning to obtain magnetic field distribution information. However, in the superconducting magnets of large-scale fusion devices, the magnet length can reach several meters, and the aperture is also considerable. To measure the uniformity of such a massive magnet, traditional methods often require inserting measuring probes into various critical locations inside the magnet.

[0004] While existing magnetic field measurement devices can meet the measurement requirements of small-sized, low-field-strength magnets to some extent, they often have many shortcomings when dealing with superconducting magnets unique to fusion devices, which have large apertures, long distances, high field strengths, and extremely high uniformity requirements. For example, their probe insertion and movement mechanisms may not be suitable for long distances and complex structures; the support and positioning systems may not be able to guarantee the stability and repeatability of the measurement system; and the reliability and accuracy of the entire device in low-temperature environments are difficult to meet the stringent standards of fusion research.

[0005] Currently, the devices used for precise measurement of fusion superconducting magnets, both domestically and internationally, are usually based on simple stepper motors or robotic arms-driven measurement probes. While this configuration can achieve basic magnetic field sampling, it cannot meet the requirements of large-scale fusion devices for high-precision inversion of magnetic field distribution in terms of critical spatial positioning accuracy and magnetic field measurement stability. It is also prone to problems such as spatial positioning errors, missing measurement points, or incomplete coverage of the measurement area. Summary of the Invention

[0006] The main objective of this invention is to provide a high-field, high-uniformity magnetic measurement device for large-aperture, long-distance superconducting magnets used in fusion, in order to overcome the problems existing in the prior art.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A high-field, high-uniformity magnetic measuring device for a large-aperture, long-distance superconducting magnet used in fusion includes a support frame, a transfer connecting support rod, a multi-angle uniformly distributed magnetic measuring disk, a long-distance magnetic measuring rod, and a three-dimensional Hall probe. The two support frames are respectively located at both ends of the device for positioning and connection with the Dewar outside the superconducting magnet. The transfer connecting support rod connects the support frame and the multi-angle uniformly distributed magnetic measuring disk for fixing the multi-angle uniformly distributed magnetic measuring disk in the room temperature aperture area inside the superconducting magnet. The three-dimensional Hall probe is mounted on the long-distance magnetic measuring rod, which can move radially and axially along the multi-angle uniformly distributed magnetic measuring disk to measure the magnetic field at different radial positions and the axial distribution of the magnetic field, respectively.

[0008] Furthermore, the support frame is a triangular stable frame structure made of alloy material. The support frame achieves high-precision and concentric positioning and connection with the Dewar shell outside the superconducting magnet through a preset installation interface.

[0009] Furthermore, the number of the transfer connecting support rods is three, which are respectively set on the three sides of the support frame to ensure that the multi-angle uniformly distributed magnetic measuring disk can be accurately positioned in the predetermined working position to provide a reference for radial measurement.

[0010] Furthermore, the transfer connection support rod includes a first connecting rod and a second connecting rod connected to each other. One end of the first connecting rod is fixedly connected to the support frame, and one end of the second connecting rod is fixedly connected to the multi-angle uniformly distributed magnetic measuring disk.

[0011] Furthermore, the multi-angle uniformly distributed magnetic measuring disk is provided with multiple nodal circles of different radii, and each nodal circle is uniformly distributed with multiple pin holes; The radius of the pitch circle can cover the target area that requires high-precision measurement, and the pin hole cooperates with the long-distance magnetic rod to guide the long-distance magnetic rod to perform radial multi-point positioning measurement.

[0012] Furthermore, the long-distance magnetic measuring rod adopts a slender rod-shaped structure, with a mounting groove at its end or middle for fixing the three-dimensional Hall probe.

[0013] Furthermore, the long-distance magnetic measuring rod integrates a magnetic measuring pull rod inside. When the magnetic measuring rod moves along the axis, the magnetic measuring pull rod is used to synchronously drive the three-dimensional Hall probe to move along the axis, so as to achieve accurate testing of the uniformity of the axial distribution of the magnetic field.

[0014] Furthermore, the multi-angle uniformly distributed magnetic measuring disk, in conjunction with the long-distance magnetic measuring rod, enables the magnetic measuring range to reach a uniform field area with a diameter ≥240m and a length ≥1200m.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The device of the present invention has the characteristics of structural stability and small deformation, and can meet complex magnetic field measurement conditions, providing key data support for the optimized design of fusion devices; By mounting a three-dimensional Hall probe on a long-distance magnetic measuring rod and cooperating with a multi-angle evenly distributed magnetic measuring disk, the long-distance magnetic measuring rod can be moved radially and axially along the multi-angle evenly distributed magnetic measuring disk. This allows for the measurement of magnetic fields at different radial positions and the axial distribution of the magnetic field, thereby enabling the measurement of the magnetic field strength within the length and diameter range of a superconducting magnet. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 This is a schematic diagram of the transfer connection support rod structure of the present invention.

[0018] Figure 3 This is a schematic diagram of the multi-angle uniformly distributed magnetic measuring disk structure of the present invention.

[0019] Explanation of reference numerals in the attached drawings: 1. Support frame; 2. Transfer connecting support rod; 21. First connecting rod; 22. Second connecting rod; 3. Multi-angle evenly distributed magnetic measuring disk; 3. Pin hole; 31. Fixing hole; 32. Long-distance magnetic measuring rod; 4. Mounting groove; 5. Three-dimensional Hall probe. Detailed Implementation

[0020] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Combination Figures 1 to 3 This embodiment provides a high-field, high-uniformity magnetic measuring device for a large-aperture, long-distance superconducting magnet used in fusion, including a support frame 1, a transfer connecting support rod 2, a multi-angle uniformly distributed magnetic measuring disk 3, a long-distance magnetic measuring rod 4, and a three-dimensional Hall probe 5. Two support frames 1 are respectively located at both ends of the device for positioning and connection with the Dewar outside the superconducting magnet. A transfer connecting support rod 2 connects the support frame 1 and the multi-angle uniformly distributed magnetic field measuring disk 3, fixing the disk 3 to the room temperature aperture region inside the superconducting magnet. A three-dimensional Hall probe 5 is mounted on a long-distance magnetic field measuring rod 4, which can move radially and axially along the multi-angle uniformly distributed magnetic field measuring disk 3, respectively for measuring the magnetic field at different radial positions and measuring the axial distribution of the magnetic field. Using this scheme, the multi-angle uniformly distributed magnetic field measuring disk 3, in conjunction with the long-distance magnetic field measuring rod 4, can achieve a magnetic field measurement range with a diameter ≥240m and a length ≥1200m for a uniform field region.

[0022] In this embodiment, the support frame 1 is a triangular stable frame structure made of alloy material. The support frame 1 achieves high-precision, concentric positioning and connection with the Dewar shell outside the superconducting magnet through a pre-set installation interface. This design ensures the strength, rigidity, and stability of the support frame 1 in low-temperature environments, guaranteeing that the magnetic measuring device can be stably and reliably positioned within the magnet. Adjustment of the support frame 1 can ensure that the coaxiality between the magnetic measuring device and the central magnetic field is <3mm, and the magnetic field uniformity in the uniform region is better than ±3%.

[0023] In this embodiment, there are three intermediate connecting support rods 2, which are respectively set on the three sides of the support frame 1. They are used to ensure that the multi-angle evenly distributed magnetic measuring disk 3 can be accurately positioned in the predetermined working position to provide a reference for radial measurement, and will not interfere with the normal operation of the magnet.

[0024] In a further embodiment, the transfer connecting support rod 2 includes a first connecting rod 21 and a second connecting rod 22 connected together. One end of the first connecting rod 21 is fixedly connected to the support frame 1, and one end of the second connecting rod 22 is fixedly connected to the multi-angle uniformly distributed magnetic measuring disk 3. Specifically, the second connecting rod 22 is connected to the fixing hole 32 on the multi-angle uniformly distributed magnetic measuring disk 3.

[0025] In this embodiment, the multi-angle uniformly distributed magnetic measuring disk 3 is provided with multiple nodal circles of different radii, and multiple pin holes 31 are evenly distributed on each nodal circle; wherein, the radius of the nodal circle can cover the target area that needs to be measured with high precision, providing a range of measurement options with different radii for the measurement of radial magnetic field distribution. The pin holes 31 cooperate with the long-distance magnetic measuring rod 4, so that the long-distance magnetic measuring rod 4 can be inserted into the pin holes 31 to guide the long-distance magnetic measuring rod 4 to perform radial multi-point positioning measurement.

[0026] In this embodiment, the long-distance magnetic measuring rod 4 adopts a slender rod-shaped structure, with a mounting groove at its end or middle for fixing the three-dimensional Hall probe 5. Using this design, the three-dimensional Hall probe 5 is securely mounted at the designated position on the long-distance magnetic measuring rod 4, ensuring that it can directly and accurately measure the magnetic field strength.

[0027] In a further embodiment, the long-distance magnetic measuring rod 4 has an integrated magnetic measuring pull rod inside. When the magnetic measuring rod moves along the axis, the magnetic measuring pull rod is used to synchronously drive the three-dimensional Hall probe 5 to move along the axis, so as to achieve accurate testing of the uniformity of the axial distribution of the magnetic field.

[0028] Specifically, in use, the device of this embodiment first installs the triangular support frame 1 at both ends of the outer Dewar onto the magnet; then assembles the intermediate connecting support rod 2, and then installs the multi-angle evenly distributed magnetic measuring disk 3 onto the magnet. Figure 1 The position shown in the figure; finally, insert the long-distance magnetic measuring rod 4, which is fixed to the three-dimensional Hall probe 5, into the multi-angle evenly distributed magnetic measuring disk 3 from one end, and exit from the other end.

[0029] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A device for measuring the magnetic field of a large-bore long-distance superconducting magnet for fusion, characterized in that, The device comprises a support frame (1), a transfer connecting support rod (2), a multi-angle uniform distribution magnetic measurement disc (3), a long-distance magnetic measurement rod (4) and a three-dimensional Hall probe (5). The two support frames (1) are respectively arranged at the two ends of the device, and are used for positioning and connecting with the dewar outside the superconducting magnet, the transfer connecting support rod (2) is connected between the support frame (1) and the multi-angle uniform distribution magnetic measurement disc (3), and is used for fixing the multi-angle uniform distribution magnetic measurement disc (3) in the room temperature hole area inside the superconducting magnet, the three-dimensional Hall probe (5) is installed on the long-distance magnetic measurement rod (4), and the long-distance magnetic measurement rod (4) can move along the radial direction and the axial direction of the multi-angle uniform distribution magnetic measurement disc (3), and is respectively used for realizing the magnetic field measurement of different radial positions and the measurement of the axial distribution of the magnetic field.

2. A device for measuring the magnetic field of a large-bore long-length superconducting magnet for fusion as claimed in claim 1, characterized in that, The support frame (1) is a triangular stable frame structure, which is made of alloy material, and the support frame (1) realizes high-precision and concentric positioning and connection with the dewar shell outside the superconducting magnet through a preset mounting interface.

3. A device for measuring the magnetic field of a large-bore long-length superconducting magnet for fusion as claimed in claim 2, characterized in that, The number of the transfer connecting support rods (2) is three, which are respectively arranged on the three frame edges of the support frame (1), and are used for ensuring that the multi-angle uniform distribution magnetic measurement disc (3) can be accurately positioned at a predetermined working position to provide a reference for radial measurement.

4. A device for measuring the magnetic field of a large-bore long-length superconducting magnet for fusion as claimed in claim 3, characterized in that, The transfer connecting support rod (2) comprises a first connecting rod (21) and a second connecting rod (22) connected with each other, one end of the first connecting rod (21) is fixedly connected with the support frame (1), and one end of the second connecting rod (22) is fixedly connected with the multi-angle uniform distribution magnetic measurement disc (3).

5. A device for measuring the magnetic field of a large-bore long-length superconducting magnet for fusion as claimed in claim 1, characterized in that, A plurality of pitch circles with different radii are arranged on the multi-angle uniform distribution magnetic measurement disc (3), and a plurality of pin holes (31) are uniformly distributed on each pitch circle. The radius of the pitch circle can cover the target area which needs to be measured with high precision, and the pin hole (31) cooperates with the long-distance magnetic measurement rod (4) to guide the long-distance magnetic measurement rod (4) to perform radial multi-point positioning measurement.

6. A device for measuring the magnetic field of a large-bore long-length superconducting magnet for fusion as claimed in claim 1, characterized in that, The long-distance magnetic measurement rod (4) adopts an elongated rod structure, and the end or middle part of the long-distance magnetic measurement rod (4) is provided with a mounting groove for fixing the three-dimensional Hall probe (5).

7. A device for measuring the magnetic field of a large-bore long-length superconducting magnet for fusion as claimed in claim 1 or 6, characterized in that, The long-distance magnetic measurement rod (4) is internally integrated with a magnetic measurement pull rod, when the magnetic measurement pull rod moves along the axis, the magnetic measurement pull rod is used for synchronously driving the three-dimensional Hall probe (5) to move along the axial direction, so as to realize accurate testing of the uniformity of the axial distribution of the magnetic field.

8. A device for measuring the magnetic field of a large-bore long-length superconducting magnet for fusion as claimed in claim 1, characterized in that, The multi-angle uniform distribution magnetic measurement disc (3) cooperates with the long-distance magnetic measurement rod (4), and the magnetic measurement range can reach a uniform field area with a diameter of ≥240 m and a length of ≥1200 m.

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