CN118197731A - High-temperature superconducting magnet device with magnetic flux density multistage amplification function - Google Patents
High-temperature superconducting magnet device with magnetic flux density multistage amplification function Download PDFInfo
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- CN118197731A CN118197731A CN202410335626.1A CN202410335626A CN118197731A CN 118197731 A CN118197731 A CN 118197731A CN 202410335626 A CN202410335626 A CN 202410335626A CN 118197731 A CN118197731 A CN 118197731A
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- superconducting
- superconducting magnet
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- 230000004907 flux Effects 0.000 title claims abstract description 17
- 230000003321 amplification Effects 0.000 title claims abstract description 7
- 238000003199 nucleic acid amplification method Methods 0.000 title claims abstract description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052802 copper Inorganic materials 0.000 claims abstract description 17
- 239000010949 copper Substances 0.000 claims abstract description 17
- 230000005284 excitation Effects 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 abstract description 7
- 238000003466 welding Methods 0.000 abstract description 5
- 230000006698 induction Effects 0.000 abstract description 4
- 238000005452 bending Methods 0.000 abstract description 3
- 238000004804 winding Methods 0.000 abstract description 3
- 238000002360 preparation method Methods 0.000 abstract description 2
- 238000004891 communication Methods 0.000 description 11
- 238000005520 cutting process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 239000002887 superconductor Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
- H01F6/04—Cooling
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
- H01F6/06—Coils, e.g. winding, insulating, terminating or casing arrangements therefor
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Containers, Films, And Cooling For Superconductive Devices (AREA)
Abstract
The invention discloses a high-temperature superconducting magnet device with a magnetic flux density multistage amplification function, belonging to the technical field of superconducting magnet application. The device is formed by alternately stacking and fixing one or more groups of superconducting ring sheets and copper sheets, three communicated ring structures with sequentially increased radiuses are cut on the superconducting sheets and the copper sheets, and the ring structures at corresponding positions have the same size. The invention adopts a superconductive sheet stacking mode, omits bending and winding links to reduce the influence on the performance of the superconductive strip; meanwhile, the device adopts the existing field cooling method to perform excitation, welding, power supply and current lead are not needed, the operation cost and heat leakage are reduced, and the device has the advantages of compact structure, detachability, high stability and simple preparation process; the REBCO superconducting magnet can stably output a plurality of stable magnetic fields with different magnetic induction intensities, expands the application range of the REBCO superconducting magnet, and can be applied to application scenes such as medium-sized and large-sized superconducting magnets.
Description
Technical Field
The invention belongs to the field of superconducting magnet application, and particularly relates to a high-temperature superconducting magnet device with a magnetic flux density multistage amplification function.
Background
The strong magnetic field is an important direction of scientific research at present, and designing a strong magnetic field test device to generate a magnetic field with higher strength has important significance for the development of scientific technology. The superconducting magnet made of the superconducting material can greatly promote the development of a steady-state strong magnetic field by virtue of the advantages of small power consumption, small space occupation, light weight, high stability, no energy loss when generating the strong magnetic field and the like.
The high-temperature superconductive wires are all in the shape of thin strips, and the superconductive strips are mechanically bent and twisted to form a double-cake or spiral tube structure. Welding is required at joints of superconducting tapes, and closed-loop operation of the superconducting magnet cannot be achieved due to the immaturity of the non-resistance welding process. The existing superconducting magnet is usually excited by a power supply in a normal-temperature environment, the power supply and the superconductor are connected through a current lead, two ends of the current lead are respectively in a low-temperature environment and a room-temperature environment, a large amount of heat is transferred into a superconducting low-temperature container due to a large temperature difference, and meanwhile, a large amount of Joule heat is generated by a current lead resistor and a welding resistor between the current lead and the superconducting wire when the current lead and the superconducting wire are electrified, so that refrigeration load is increased, and cooling and running cost are increased. Accordingly, there is a need for a high temperature superconducting magnet device having a magnetic flux density multistage amplifying function to solve the above-mentioned problems.
Disclosure of Invention
The invention aims to provide a high-temperature superconducting magnet device with a magnetic flux density multistage amplification function based on REBCO coating superconducting ring pieces.
The superconducting magnet is characterized in that a plurality of communicated circular ring structures with sequentially reduced radiuses are cut on a superconducting piece and a copper piece, and the circular ring structures at the corresponding positions have the same size; alternately stacking N+1 copper sheets and N superconducting sheets to form a superconducting magnet, wherein N is a positive integer;
wherein, the stacking directions of N REBCO superconducting ring sheets in the superconducting magnet are consistent.
The superconducting magnet is excited by an exciting coil, and the exciting coil is obtained by winding a copper wire on an iron core limb. The specific operation is as follows: the method comprises the steps of placing an exciting coil into a circular ring with the largest radius of a superconducting magnet, supplying power to the exciting coil by a direct current power supply at normal temperature to generate stable magnetic flux in the superconducting ring, reducing the ambient temperature to enable the superconducting magnet to enter the superconducting state from the normal temperature, gradually reducing exciting current to zero after reaching a target temperature, and generating stable induction current in a superconducting ring sheet to maintain the total magnetic flux in the superconducting magnet closed ring unchanged due to the conservation of the magnetic flux of the closed ring superconductor, so that stable magnetic fields with different intensities are generated and maintained in each circular ring.
The superconducting magnet is cooled by liquid nitrogen soaking cooling, liquid helium soaking cooling or other cooling media or a cold conduction mode.
The diameter size of the exciting coil is slightly smaller than the diameter of the largest circular ring on the superconducting ring sheet.
For the REBCO superconductive ring sheets with three sequentially reduced radiuses and different circle center positions, when in use, the excitation coils are only required to be inserted into the circular ring with the largest radius for integral excitation, so that stable magnetic fields with different intensities can be obtained in the rest circular rings.
The beneficial effects of the invention are as follows:
The invention breaks through the original design thought of generating a magnetic field by using one magnet, and realizes the purpose of generating stable magnetic fields with different intensities by cutting circular hole annular sheets with different radiuses on the superconducting sheet through one-hole excitation multiple holes, thereby providing a new thought for the design of superconducting magnets.
The invention is formed by alternately stacking the superconducting sheet and the copper sheet, omits bending and winding links, has little influence on the current capacity of the superconducting material, is convenient to manufacture, has simple structure and has no bending radius limit;
The invention adopts a field cooling method to excite, induces stable current in the superconducting magnet, realizes the non-resistance closed-loop operation of the superconducting magnet, and has higher current carrying capacity; and a welding process or a current lead is not needed, so that the superconducting magnet has a compact structure and reduces the heat loss of the superconducting magnet.
Drawings
FIG. 1 is a schematic diagram of a single communication three-hole closed loop superconductive sheet;
FIG. 2 is a schematic view of a copper sheet;
FIG. 3 is a schematic diagram of a multi-pass superconducting magnet based on REBCO coated superconducting sheets;
FIG. 4 is a timing diagram of the energizing coil with current in and out during the energizing process;
FIG. 5 is a schematic diagram of the magnetic field and current of a high temperature superconducting permanent magnet assembled by a single communication three-hole closed loop superconducting sheet stacking unit after excitation;
In the figure: 101-a first round hole; 102-a second round hole; 103-a third round hole; 104-a slit; 201-exciting coil.
Detailed Description
The embodiments of the present invention will be explained below with reference to the drawings:
The invention provides a multi-communication superconducting magnet based on REBCO superconducting plates, and the invention is further described below with reference to the embodiment and the accompanying drawings.
1. As shown in fig. 1, the REBCO single-communication three-hole closed-loop superconducting ring sheet is prepared by the following specific processes:
the REBCO single-communication three-hole closed-loop superconducting ring sheet which is formed by cutting 10 rings with separated positions is specifically prepared by the following steps:
The existing REBCO superconductive sheet is cut into circular sheets, and then 3 circular ring shapes with the widths d and the inner diameters r1, r2 and r3 which are separated from each other are sequentially cut at proper positions in the circular sheets and respectively marked as 101, 102 and 103. And simultaneously, cutting a slit with the width w1 (smaller than 1 mm) and the length l 1 (not smaller than d) at the connecting line of the circle centers of the adjacent round holes so as to communicate the adjacent round holes, thereby obtaining the REBCO single-communication three-hole closed-loop superconducting ring sheet shown in the figure 1.
Wherein the REBCO single-communication three-hole closed-loop superconducting ring piece is preferably an axisymmetric ring piece, and the size requirements of each part are as follows: r1, r2, r3 decrease in sequence.
2. As shown in fig. 2, a copper sheet was prepared: cutting the copper sheet into copper sheets with the shape and the size identical to those of the superconducting ring sheet.
3. Referring to fig. 3, the preparation of superconducting magnet comprises the following steps:
(1) Horizontally placing a1 st copper sheet, then stacking the 1 st REBCO single-communication three-hole closed-loop superconducting ring sheet above the copper sheet, and completely aligning the upper part, the lower part, the left part and the right part during stacking;
(2) And the like, stacking a2 nd copper sheet, a2 nd REBCO single-communication three-hole closed-loop superconducting ring sheet, … … th copper sheet, an N th REBCO single-communication three-hole closed-loop superconducting ring sheet and an N+1th copper sheet; the stacking directions of the N REBCO single-communication three-hole closed-loop superconducting ring sheets are consistent;
(3) The closed-loop operation of the superconducting magnet is realized by adopting an excitation coil through a field cold excitation mode, and the method specifically comprises the following steps: firstly, an exciting coil with an iron core is inserted into a circular ring 101 with the largest inner radius of a superconducting magnet, and after the device is fixed, a direct current power supply is used for supplying direct current to the exciting coil at normal temperature, as shown in fig. 4: phase I (0-t 1) period: the exciting current gradually increases from the time 0, and reaches the target value I0 at that time. Phase II (t 1-t 2) period: and keeping the exciting current unchanged at all times, and cooling the superconducting magnet to reach the target temperature in a superconducting state. Phase III (t 2-t 3) period: gradually reducing the exciting current, and reducing the exciting current to zero at the moment. At this time, stable induction current is generated in the superconducting ring sheet to maintain the total magnetic flux in the closed loop of the superconducting magnet unchanged, so that stable magnetic fields with different magnetic induction intensities are generated in the respective loops.
The invention has simple manufacturing process, no lead leakage and low operation cost, has the functions of self-stabilization, self-protection and self-recovery of magnetic flux, and does not need complex quench detection and protection measures. In addition, an external power supply is not needed, and a high magnetic field can be generated on the superconducting sheet with a small size only by providing a power supply capable of maintaining the superconducting sheet in a superconducting state.
Claims (4)
1. The high-temperature superconducting magnet device with the magnetic flux density multistage amplification function is characterized by being formed by directly stacking superconducting ring sheets and copper sheets, and arranging an excitation coil in a largest round hole of the magnet. Specifically, the device is obtained by alternately stacking N REBCO superconducting ring sheets and N+1 copper sheets; wherein N is a positive integer; the shape and the size of the N+1 copper sheets are the same as those of the N REBCO superconductive ring sheets; wherein the annular sheet consists of a circular ring which comprises a plurality of circular centers at different positions and is communicated through slits.
2. The superconducting magnet according to claim 1, wherein a plurality of circular areas with different circle center positions and different radiuses are communicated with each other, and a narrow slit is formed at the joint of adjacent circular areas.
3. The superconducting magnet according to claim 1, wherein the superconducting magnet is internally excited with an excitation coil, specifically operated as: the exciting coil is placed in a circular ring with the largest radius of the superconducting magnet, two leads are led out of the exciting coil, external direct current I 0 is led in, a certain exciting time sequence is applied to the exciting coil, a field-cooled exciting method is utilized to generate constant current I 1 continuously flowing at the periphery of three circular holes, and therefore magnetic fields with different amplification levels are generated in REBCO superconducting ring sheets consisting of a plurality of circular rings with different circle center positions and different radiuses, and closed-loop superconducting operation of the magnet is achieved.
4. A high-temperature superconducting magnet device having a magnetic flux density multistage amplifying function according to claim 1, 2 or 3, wherein the magnetic flux densities of the first circular hole and the second circular hole when the magnetic field is unsaturated are respectively:
B1＝B3*(r1/r3)
B2＝B3*(r2/r3)
Wherein, B 1 is the magnetic flux density of the first round hole, B 2 is the magnetic flux density of the second round hole, B 3 is the magnetic flux density of the third round hole, and r 1、r2、r3 is the radius of the first round hole, the second round hole and the third round hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410335626.1A CN118197731A (en) | 2024-03-22 | 2024-03-22 | High-temperature superconducting magnet device with magnetic flux density multistage amplification function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410335626.1A CN118197731A (en) | 2024-03-22 | 2024-03-22 | High-temperature superconducting magnet device with magnetic flux density multistage amplification function |
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| Publication Number | Publication Date |
|---|---|
| CN118197731A true CN118197731A (en) | 2024-06-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410335626.1A Pending CN118197731A (en) | 2024-03-22 | 2024-03-22 | High-temperature superconducting magnet device with magnetic flux density multistage amplification function |
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| Country | Link |
|---|---|
| CN (1) | CN118197731A (en) |
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2024
- 2024-03-22 CN CN202410335626.1A patent/CN118197731A/en active Pending
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