CN117012495A - Multi-communication superconductive magnet based on ReBCO coating superconductive sheet - Google Patents
Multi-communication superconductive magnet based on ReBCO coating superconductive sheet Download PDFInfo
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- CN117012495A CN117012495A CN202310364672.XA CN202310364672A CN117012495A CN 117012495 A CN117012495 A CN 117012495A CN 202310364672 A CN202310364672 A CN 202310364672A CN 117012495 A CN117012495 A CN 117012495A
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- sheets
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- 238000004891 communication Methods 0.000 title abstract description 7
- 239000011248 coating agent Substances 0.000 title abstract description 5
- 238000000576 coating method Methods 0.000 title abstract description 5
- 230000005284 excitation Effects 0.000 claims abstract description 10
- 230000006698 induction Effects 0.000 claims abstract description 6
- 239000002887 superconductor Substances 0.000 claims abstract description 4
- 230000004907 flux Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 239000004593 Epoxy Substances 0.000 claims description 4
- 239000002655 kraft paper Substances 0.000 claims description 3
- 239000010408 film Substances 0.000 claims description 2
- 239000011810 insulating material Substances 0.000 claims description 2
- 238000001816 cooling Methods 0.000 abstract description 7
- 238000003466 welding Methods 0.000 abstract description 5
- 238000005452 bending Methods 0.000 abstract description 3
- 238000002360 preparation method Methods 0.000 abstract description 3
- 238000004804 winding Methods 0.000 abstract description 3
- 230000000087 stabilizing effect Effects 0.000 abstract 1
- 238000005520 cutting process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 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
- 239000004020 conductor Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000011152 fibreglass Substances 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
- 229920000647 polyepoxide Polymers 0.000 description 1
- -1 rare earth barium copper oxide Chemical class 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 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
Abstract
The invention relates to a multi-communication high-temperature superconducting magnet which is based on a ReBCO coating superconducting piece and can simultaneously generate various magnetic induction intensities. The superconducting magnet is formed by alternately stacking and fixing one or more groups of superconducting ring sheets and insulating sheets, and a plurality of communicated ring structures with sequentially reduced radiuses are cut on the superconducting sheets and the insulating sheets, wherein 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 magnetic field stabilizing device can stably output a plurality of stable magnetic fields with different magnetic induction intensities, expands the application range of the ReBCO superconductor to the 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 multi-communication superconducting magnet based on a ReBCO coating superconducting plate.
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.
Compared with the conventional magnet, the superconducting magnet has the advantages of high magnetic field strength, low power loss, high stability and the like, and is applied to a plurality of strong magnetic field occasions, such as a superconducting tokamak device, a superconducting motor, a high-energy accelerator and the like.
Along with the continuous progress of the manufacturing process, the ReBCO (rare earth barium copper oxide, re is Y, sm or Nd) coated conductor is widely applied to the field of practical engineering, and the ReBCO coated conductor has the advantages of high upper critical magnetic field, high critical current density, low alternating current loss, excellent mechanical property and the like, and is suitable for manufacturing superconducting magnet devices with good high-field performance and electromagnetic properties under external fields.
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 ReBCO superconducting magnets cannot realize closed-loop operation 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 is increased.
Disclosure of Invention
The invention aims to provide a multi-communication superconducting magnet which is based on a ReBCO coating superconducting ring piece and can simultaneously generate various magnetic fields.
The superconducting magnet is characterized in that a plurality of communicated circular ring structures with sequentially reduced radiuses are cut on a superconducting sheet and an insulating sheet, and the circular ring structures at the corresponding positions have the same size; n+1 insulating sheets and N superconducting sheets are alternately stacked, flanged up and down and fixed through an insulating pull rod to form a superconducting magnet, and N is a positive integer;
wherein, the stacking directions of N ReBCO superconducting ring sheets in the superconducting magnet are consistent.
Wherein the insulating sheet in the superconducting magnet is an organic insulating sheet, kraft paper or epoxy sheet.
Wherein the fixing device is made of stainless steel, epoxy glass fiber reinforced plastic or epoxy resin; the fixing device comprises a flange, bolts and nuts.
The superconducting magnet is excited by an exciting coil, and the exciting coil is obtained by winding a copper wire on an iron core column; 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 different radii and different circle center positions, which are sequentially reduced by 5 radii, the stable magnetic fields with different intensities can be obtained in the rest circular rings only by inserting the exciting coil into the circular ring with the largest radius for integral excitation during use.
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 sheets and the insulating sheets, omits bending and winding links, has little influence on the current passing capability of superconducting materials, 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 ReBCO superconductive ring plate structure;
description of the reference numerals: 101-I circular hole; 102-a second round hole; 103-III round holes; 104-IV round holes; 105-V round hole;
FIG. 2 is a schematic view of an insulating sheet;
FIG. 3 is a schematic diagram of a multi-communication superconducting magnet based on ReBCO coated superconducting sheets;
description of the reference numerals: 4-flanges; 5-flange positioning holes; 6-a bolt; 7-a nut; 8-exciting coil; 9-a direct current power supply;
fig. 4 is a waveform diagram of a current source.
Detailed Description
The invention provides a multi-communication superconducting magnet based on a ReBCO superconducting sheet, and the invention is further described below with reference to the embodiment and the accompanying drawings.
1. As shown in fig. 1, a ReBCO square superconducting ring sheet 1 is prepared by the following specific processes:
the specific preparation process of the ReBCO square superconducting ring sheet which is formed by cutting 5 rings with separated positions is as follows:
cutting the existing ReBCO superconducting thin sheet into square sheets, and sequentially cutting the square sheets into the inner proper positions with the separated positions, the width of d1 and the inner diameter of r 1 、r 2 、r 3 、r 4 、r 5 Is denoted 101, 102, 103, 104 and 105, respectively. Simultaneously, the connecting line of the circle centers of all adjacent round holes is cut to have the width w 1 (less than 1 mm) length l 1 (not less thand 1 ) The slit of the rectangular superconducting ring sheet is communicated with adjacent round holes, and the rectangular superconducting ring sheet 1 of ReBCO shown in figure 1 is obtained.
Wherein, the square superconducting ring piece of ReBCO is preferably an axisymmetric ring piece, and the size requirements of each part are as follows: r is (r) 1 、r 2 、r 3 、r 4 、r 5 Which decrease in turn.
2. As shown in fig. 2, an insulating sheet 2 was prepared: an organic insulating film such as a PPLP insulating material film, kraft paper or epoxy sheet is cut into insulating sheets 2 having the same shape and size as the above-described superconducting ring sheets, except that there is no cutting gap between the rings.
3. Referring to fig. 3, the preparation of superconducting magnet comprises the following steps:
(1) Horizontally placing a 1 st square insulating sheet, then stacking the 1 st ReBCO square superconducting ring sheet above the insulating sheet, and completely aligning the insulating sheet up and down and left and right during stacking;
(2) And the like, stacking a 2 nd square insulating sheet, a 2 nd ReBCO square superconducting ring sheet, … …, an N th square insulating sheet, an N th ReBCO square superconducting ring sheet and an N+1 th square insulating sheet; wherein the stacking directions of the N ReBCO square superconducting ring sheets are consistent;
(3) After stacking, flanges 4 are added up and down for fixing, and a superconducting ring sheet and an insulating sheet are pressed and fixed through flange positioning holes 5 by bolts 6 and nuts 7 to form a superconducting magnet; wherein the inner opening of the flange 4 is completely the same as the size of the inner hole of the stacking body;
(4) 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 is provided for the exciting coil 8 by using a direct current power supply 9 at normal temperature, as shown in fig. 4: stage I (0-t) 1 ) Time period: the exciting current gradually increases from the moment 0, and reaches the target value I at the moment 0 . Stage II (t) 1 -t 2 ) Time period: and keeping the exciting current unchanged at all times, and cooling the superconducting magnet to reach the target temperature in a superconducting state. Stage III (t) 2 -t 3 ) Time of daySegment: 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.
Wherein the outer radius of the exciting coil 8 is slightly smaller than the radius of the inner hole 101 of the superconducting magnet, and the height of the exciting coil 8 is greater than the height of the superconducting magnet.
The above-mentioned high-temperature superconducting magnet with five circular holes is only an example of the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and other superconducting magnets with holes of different numbers, different shapes (such as square holes, rectangular holes, oval holes, etc.), and superconducting sheets made of other materials should be covered in the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (3)
1. The high-temperature superconducting magnet based on the ReBCO superconducting ring piece is characterized in that the superconducting ring piece and the insulating piece of the superconducting magnet are directly stacked, an exciting coil is placed in a largest round hole of the magnet and fixed, two leads led out of the exciting coil are connected with an external direct current power supply, and a magnetic field is generated through the exciting coil so as to realize closed-loop superconducting operation of the magnet; the magnet is obtained by alternately stacking and fixing N ReBCO superconducting ring sheets and N+1 insulating sheets; wherein N is a positive integer; the shape and the size of the N+1 insulating sheets are the same as those of the N ReBCO superconducting ring sheets; the ring sheet consists of a plurality of rings with different circle centers and communicated through slits;
for a ReBCO superconducting ring sheet consisting of a plurality of circular rings with different circle center positions and different radiuses, when in operation, an excitation coil penetrates through the circular ring with the largest radius to carry out integral magnet excitation, and different magnetic fields are generated in the rest circular rings;
the superconducting magnet is excited by the inside of an exciting coil, and the specific operation is as follows: the method comprises the steps of placing an excitation coil into a circular ring with the largest radius of a superconducting magnet, supplying power to the excitation coil by a direct current power supply at normal temperature to generate stable magnetic flux in the superconducting ring, reducing the temperature of the magnet to enable the superconducting magnet to enter the superconducting state from the normal temperature, gradually reducing the excitation current to zero after the superconducting magnet is stabilized, and generating stable induction current in a superconducting ring sheet to maintain the superconducting magnet to operate in a closed loop due to the conservation of magnetic flux of the closed loop superconductor, so that stable magnetic fields with different intensities are generated and maintained at the circle centers of the circular rings.
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 N ReBCO superconducting ring sheets and n+1 insulating sheets are alternately stacked. The insulating sheet can be made of PPLP insulating material, organic insulating film, kraft paper and epoxy sheet, and has the same size as the superconductive ring sheet and circular structure with the same position and size as the superconductive sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310364672.XA CN117012495A (en) | 2023-04-07 | 2023-04-07 | Multi-communication superconductive magnet based on ReBCO coating superconductive sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310364672.XA CN117012495A (en) | 2023-04-07 | 2023-04-07 | Multi-communication superconductive magnet based on ReBCO coating superconductive sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117012495A true CN117012495A (en) | 2023-11-07 |
Family
ID=88562512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310364672.XA Pending CN117012495A (en) | 2023-04-07 | 2023-04-07 | Multi-communication superconductive magnet based on ReBCO coating superconductive sheet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117012495A (en) |
-
2023
- 2023-04-07 CN CN202310364672.XA patent/CN117012495A/en active Pending
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