Superconducting magnet device for generating three-dimensional vector magnetic field

Abstract

The utility model discloses a superconducting magnet device for generating a three-dimensional vector magnetic field, which comprises a vacuum container, a superconducting magnet mechanism is arranged in the vacuum container, the superconducting magnet mechanism comprises a superconducting coil, and the superconducting coil is used for generating the three-dimensional vector magnetic field. Under the same working magnetic field, the structure space is smaller, the magnetic field utilization rate is higher, the manufacturing cost can be remarkably reduced, meanwhile, the uniformity of the magnetic fields provided by the X coil and the Y coil is higher, meanwhile, the ultra-low vibration performance is achieved under the high magnetic field, the optical or magnetic measurement requirement with the very high vibration requirement can be met, and the application prospect is wide. The superconducting coil is cooled by using the flexible cold conduction belt, the vibration of the superconducting coil can be effectively reduced, the vibration stability of a magnetic field is improved, 0.5-1% of current is overshot when the magnetic field is loaded, and then the current is adjusted to be reduced to a target magnetic field, so that the magnetic field can be quickly stabilized, and the drift effect of the magnetic field is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of superconducting magnets, in particular to a superconducting magnet device for generating a three-dimensional vector magnetic field. BACKGROUND

[0002] Superconducting magnet refers to a kind of electromagnet made of second superconductor with high transition temperature and particularly high critical magnetic field coil at low temperature, its main feature is that there is no electric loss generated by wire resistance, and there is no magnetic loss generated by the existence of iron core, and it has strong practical value.

[0003] The conventional domestic and foreign three-axis vector superconducting magnet is usually composed of three groups of solenoid magnets, the Z axis is usually composed of a single or multiple solenoids, and the X / Y is respectively composed of two split solenoids, which has the problems of large volume of superconducting coil, low magnetic field utilization rate, high cost, and low uniformity due to the long distance between X and Y and the magnetic field center. CONTENT OF THE INVENTION

[0004] In view of the problems of large volume of superconducting coil, low magnetic field utilization rate, high cost, and low uniformity due to the long distance between X and Y and the magnetic field center of the existing three-axis vector superconducting magnet, the present application provides a superconducting magnet device for generating a three-dimensional vector magnetic field.

[0005] The present application provides a superconducting magnet device for generating a three-dimensional vector magnetic field, which adopts the following technical scheme:

[0006] A superconducting magnet device for generating a three-dimensional vector magnetic field, comprising a vacuum container, the inside of the vacuum container is provided with a superconducting magnet mechanism, the superconducting magnet mechanism comprises a superconducting coil, and the superconducting coil generates a three-dimensional vector magnetic field.

[0007] Optionally, the superconducting magnet mechanism further comprises a pulse tube refrigerator, the pulse tube refrigerator is fixedly installed on the upper surface of the vacuum container, the inside of the vacuum container is provided with a cold screen, the cold end of the pulse tube refrigerator is fixedly installed on the outer surface of the cold screen, and the other cold end of the pulse tube refrigerator is fixedly installed with a cold heat conducting connecting piece.

[0008] Optionally, one end of the cold heat conducting connecting piece is fixedly installed with a fixed cold plate, the superconducting coil comprises a coil skeleton, an X coil, a Y coil and a Z coil, the outer surface of the fixed cold plate is fixedly installed with the outer surface of the coil skeleton, and the X coil, the Y coil and the Z coil are all wound on the outer surface of the coil skeleton.

[0009] Optionally, the Z coil is an inner coil and is in the shape of a solenoid coil, the X coil is a middle coil and is in the shape of a saddle coil, and the Y coil is an outer coil and is in the shape of a saddle coil.

[0010] Optionally, the vacuum container is internally provided with a room temperature hole, a gap between the inner wall of the room temperature hole and the cold shield is a cold shield inner cylinder, the inner wall of the cold shield inner cylinder is fixedly bonded with an adiabatic layer, and the adiabatic layer is made of double-sided aluminum-plated film.

[0011] Optionally, the upper surface of the vacuum container is fixedly provided with a vacuum electric connector, one end of the vacuum electric connector is electrically connected with the X coil, the Y coil and the Z coil respectively.

[0012] Optionally, the upper surface of the vacuum container is fixedly provided with a vacuum suction port provided with a high-vacuum angle valve, and the upper surface of the vacuum container is fixedly provided with a signal line interface.

[0013] In summary, the present application has at least one of the following beneficial technical effects:

[0014] By arranging the superconducting magnet device for generating a three-dimensional vector magnetic field, a compact superconducting coil structure is adopted, the Z coil is an inner coil and is in the shape of a solenoid, the X coil and the Y coil are in the shape of a saddle coil, the structure space is smaller under the same working magnetic field, the magnetic field utilization rate is higher, the manufacturing cost can be significantly reduced, the magnetic field uniformity provided by the X coil and the Y coil is higher, the super-low vibration performance is provided under a high magnetic field, the optical or magnetic measurement requirements with high vibration requirements can be met, the superconducting coil is cooled by using a flexible cold lead, the superconducting coil vibration can be effectively reduced, the vibration stability of the magnetic field is improved, the overshoot is about 0.5% to 1% current when the magnetic field is loaded, the current is adjusted to the target magnetic field, which is beneficial to quickly stabilize the magnetic field and reduce the magnetic field drift, the existing three-axis vector superconducting magnet has the problems of large superconducting coil volume, low magnetic field utilization rate and high cost, and the uniformity is too low due to the long distance between the X coil and the Y coil from the magnetic field center. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 A schematic view of the superconducting magnet device for generating a three-dimensional vector magnetic field is provided for the present application;

[0016] Figure 2 A perspective view of the pulse tube refrigerator structure of the superconducting magnet device for generating a three-dimensional vector magnetic field is provided for the present application;

[0017] Figure 3 A perspective view of the superconducting coil structure of the superconducting magnet device for generating a three-dimensional vector magnetic field is provided for the present application;

[0018] Figure 4 A perspective view of a Y coil structure of a superconducting magnet device for generating a three-dimensional vector magnetic field is provided in the utility model;

[0019] Figure 5 A perspective view of a fixed cold disc structure of a superconducting magnet device for generating a three-dimensional vector magnetic field is provided in the utility model;

[0020] Figure 6 A perspective view of a vacuum extraction port structure of a superconducting magnet device for generating a three-dimensional vector magnetic field is provided in the utility model.

[0021] In the figure: 1, vacuum container; 2, pulse tube refrigerator; 21, cold screen; 22, cold heat connecting piece; 23, fixed cold disc; 3, superconducting coil; 31, coil framework; 32, X coil; 33, Y coil; 34, Z coil; 4, room temperature hole; 41, cold screen inner cylinder; 42, heat insulation layer; 5, vacuum electric connector; 51, vacuum extraction port; 52, signal line interface. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings Figures 1-6 The application is further described in detail.

[0023] Reference Figures 1-6 A superconducting magnet device for generating a three-dimensional vector magnetic field, comprising a vacuum container 1, the inside of the vacuum container 1 is provided with a superconducting magnet mechanism, the superconducting magnet mechanism comprises a superconducting coil 3, the superconducting coil 3 generates a three-dimensional vector magnetic field.

[0024] Specifically, in order to cool the superconducting coil 3 and the cold screen 21, the superconducting magnet mechanism further comprises a pulse tube refrigerator 2, the pulse tube refrigerator 2 is a double-stage refrigerator, comprising a refrigerator 1 stage and a refrigerator 2 stage, the pulse tube refrigerator 2 is fixedly installed on the upper surface of the vacuum container 1, the inside of the vacuum container 1 is provided with a cold screen 21, the refrigerator 1 stage of the pulse tube refrigerator 2 is fixedly installed with the outer surface of the cold screen 21, the cold screen 21 can be usually cooled to about 40K, thereby providing a low heat leakage vacuum radiation environment for the superconducting coil 3.

[0025] The 2-stage pulse tube refrigerator 2 is fixedly installed with a cold heat guide connecting piece 22 for cooling the superconducting coil 3. The superconducting coil 3 can be cooled to an ultra-low temperature state, and the superconducting coil 3 can be generally cooled to below 5K, so that the superconducting coil 3 is in a superconducting state, has a high current-carrying capacity, and has high magnetic field performance. The flexible cold heat guide connecting piece 22 cools the superconducting coil 3, which can effectively reduce the vibration of the superconducting coil 3 and improve the vibration stability of the magnetic field. The material of the flexible cold heat guide connecting piece 22 is oxygen-free copper, and other materials with good heat conductivity can also be used. The cold heat guide connecting piece 22 is made of soft braided wire, and can also be made of copper stranded wire or copper sheet, but the softness will be sacrificed. The pulse tube refrigerator 2 is fixed separately with the superconducting magnet to reduce the vibration of the superconducting coil 3, and can also be fixed integrally with the superconducting magnet.

[0026] Specifically, in order to install the superconducting coil 3, one end of the cold heat guide connecting piece 22 is fixedly installed with a fixed cold plate 23. The fixed cold plate 23 is made of oxygen-free copper or aluminum alloy, which ensures good thermal contact and also has certain fixing capacity. The superconducting coil 3 includes a coil skeleton 31, an X coil 32, a Y coil 33, and a Z coil 34. The outer surface of the fixed cold plate 23 is fixedly installed with the outer surface of the coil skeleton 31. The coil skeleton 31 is divided into three groups of skeletons and is made of aluminum alloy. The aluminum alloy skeleton is a paramagnetic substance, which has the advantages of light weight and no residual magnetism compared to other skeleton materials such as stainless steel. The X coil 32, the Y coil 33, and the Z coil 34 are all wound on the outer surface of the coil skeleton 31.

[0027] Specifically, in order to reduce the volume of the superconducting coil 3, the Z coil 34 is an inner coil and has a spiral tube coil shape, the X coil 32 is a middle coil and has a saddle coil shape, and the Y coil 33 is an outer coil and has a saddle coil shape. A compact structure is adopted. The Z coil 34 is an inner coil and has a solenoid form. The X coil 32 and the Y coil 33 have a saddle coil shape. Under the same working magnetic field, the structure has a smaller space and higher magnetic field utilization rate, which can significantly reduce the production cost. At the same time, the magnetic field uniformity provided by the X coil 32 and the Y coil 33 is higher. Compensation coils or field uniformity coils can also be added to correct the magnetic field on this basis. The X coil 32 and the Y coil 33 can also have other shapes, such as a solenoid shape or a CCT, DCT shape.

[0028] Specifically, in order to facilitate the measurement of superconducting coil 3, the interior of vacuum container 1 is provided with a room temperature hole 4, which can provide a large-diameter cylindrical space at room temperature, and is used to insert other scientific measurement devices, so as to provide installation and test space for the scientific measurement devices. In order to reduce the radiation heat leakage, a cold shield inner cylinder 41 is arranged between the room temperature hole 4 and the superconducting coil 3. The inner wall of the cold shield inner cylinder 41 is fixedly bonded with a heat insulation layer 42. The material of the heat insulation layer 42 is double-sided aluminum-plated film.

[0029] Specifically, in order to provide power supply for the superconducting coil 3, a vacuum electrical connector 5 is fixedly installed on the upper surface of the vacuum container 1. One end of the vacuum electrical connector 5 is electrically connected with the X coil 32, the Y coil 33 and the Z coil 34 respectively. The vacuum electrical connector 5 includes three groups of current lead vacuum electrical connectors 51, which are used to separately supply power to the X coil 32, the Y coil 33 and the Z coil 34 respectively.

[0030] Specifically, in order to vacuumize the superconducting magnet device, a vacuum suction port 51 with a high vacuum angle valve is fixedly installed on the upper surface of the vacuum container 1. The vacuum suction port 51 is used to vacuumize the superconducting magnet device, so that the interior of the superconducting magnet device obtains high vacuum, thereby reducing the heat leakage caused by the gas heat exchange in the superconducting magnet, and enabling the pulse tube refrigerator 2 to have sufficient remaining cold capacity to cool the superconducting coil 3 to ultra-low temperature. A signal line interface 52 is fixedly installed on the upper surface of the vacuum container 1. The signal line interface 52 is isolated from the vacuum inside the superconducting magnet by a vacuum wall-penetrating piece, and provides an interface for detecting temperature and quench pressure drop.

[0031] By arranging the superconducting magnet device for generating three-dimensional vector magnetic field, a compact structure is adopted. The Z coil 34 is an inner coil in the form of a solenoid. The X coil 32 and the Y coil 33 are saddle-shaped coils. In the same working magnetic field, the structure space is smaller, the magnetic field utilization rate is higher, the manufacturing cost can be significantly reduced, the magnetic field uniformity provided by the X coil 32 and the Y coil 33 is higher, and the super-low vibration performance is provided in the high magnetic field, so that the measurement requirements of optics or magnetism with high vibration requirements can be met. The superconducting coil 3 is cooled by using flexible cold lead belts, which can effectively reduce the vibration of the superconducting coil 3 and improve the vibration stability of the magnetic field. When the magnetic field is loaded, the overshoot is about 0.5% to 1% of the current. After adjusting the current to the target magnetic field, the magnetic field can be quickly stabilized, and the magnetic field drift can be reduced. The existing three-axis vector superconducting magnet has the problems of large volume of the superconducting coil 3, low magnetic field utilization rate and high cost. In addition, due to the long distance between the X coil 32 and the Y coil 33 and the magnetic field center, the uniformity is too low.

[0032] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, any equivalent changes made on the basis of the structure, shape and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A superconducting magnet device for generating a three-dimensional vector magnetic field, comprising a vacuum vessel (1), characterized in that: The interior of the vacuum container (1) is provided with a superconducting magnet mechanism, which comprises a superconducting coil (3) for generating a three-dimensional vector magnetic field; The superconducting magnet mechanism further comprises a pulse tube refrigerator (2) fixedly installed on the upper surface of the vacuum container (1), the interior of the vacuum container (1) is provided with a cold screen (21), the cold end of the pulse tube refrigerator (2) is fixedly installed with the outer surface of the cold screen (21), and the other cold end of the pulse tube refrigerator (2) is fixedly installed with a cold lead connection piece (22); One end of the cold lead connection piece (22) is fixedly installed with a fixed cold plate (23), the superconducting coil (3) comprises a coil skeleton (31), an X coil (32), a Y coil (33) and a Z coil (34), the outer surface of the fixed cold plate (23) is fixedly installed with the outer surface of the coil skeleton (31), and the X coil (32), the Y coil (33) and the Z coil (34) are all wound on the outer surface of the coil skeleton (31). The Z coil (34) is an inner coil and has a spiral tube coil shape, the X coil (32) is a middle coil and has a saddle-shaped coil shape, and the Y coil (33) is an outer coil and has a saddle-shaped coil shape.

2. A superconducting magnet apparatus for generating a three-dimensional vector magnetic field according to claim 1, characterized in that: The interior of the vacuum container (1) is provided with a room temperature hole (4), the gap between the inner wall of the room temperature hole (4) and the cold screen (21) is a cold screen inner cylinder (41), the inner wall of the cold screen inner cylinder (41) is fixedly bonded with a heat insulation layer (42), and the material of the heat insulation layer (42) is double-sided aluminum-plated film.

3. A superconducting magnet apparatus for generating a three-dimensional vector magnetic field according to claim 1, characterized in that: The upper surface of the vacuum container (1) is fixedly installed with a vacuum electric connector (5), one end of the vacuum electric connector (5) is electrically connected with the X coil (32), the Y coil (33) and the Z coil (34) respectively.

4. A superconducting magnet apparatus for generating a three-dimensional vector magnetic field according to claim 1, characterized in that: The upper surface of the vacuum container (1) is fixedly installed with a vacuum suction port (51) with a high vacuum angle valve, and the upper surface of the vacuum container (1) is fixedly installed with a signal line interface (52).

Images