CN114340366A - Non-resistance passive magnetic shielding device with high-temperature superconducting ring sheet stacking structure - Google Patents
Non-resistance passive magnetic shielding device with high-temperature superconducting ring sheet stacking structure Download PDFInfo
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- CN114340366A CN114340366A CN202111505620.7A CN202111505620A CN114340366A CN 114340366 A CN114340366 A CN 114340366A CN 202111505620 A CN202111505620 A CN 202111505620A CN 114340366 A CN114340366 A CN 114340366A
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Abstract
The invention discloses a non-resistance passive magnetic shielding device with a high-temperature superconducting ring sheet stacking structure, which is formed by stacking ring sheets with different structures based on a superconducting ring sheet obtained by cutting and processing a high-temperature superconducting strip by a proper method. The single superconducting ring piece can be in a ring shape formed by concentric circles inside and outside, or in a shape of an inner circle and an outer circle. The stacking mode of the ring sheets can be a compact type with minimum spacing, a discrete type with adjustable spacing, a split type with a certain gap formed by combining two or more compact stacks, and the like. The magnetic shielding device has the advantages of simple structure, convenient manufacture, flexible function and the like, and the devices with various stacked structures have proved to have extremely high axial shielding coefficient and high working magnetic field compared with tubular superconducting block shielding devices, and have excellent low-frequency shielding performance compared with shielding devices based on a normal conductive coil and a jointed superconducting coil.
Description
Technical Field
The invention relates to a magnetic shielding system of various precise electronic and scientific instruments, in particular to a coil structure design of a superconducting passive magnetic shielding, which is mainly applied to the technical field of electromagnetic shielding in the fields of superconducting electronics and the like.
Background
In advanced science and technology fields such as superconducting electronics, superconducting quantum computing, precision measurement technology and the like, the safe and effective operation of devices requires high sensitivity to weak magnetic signals, background environments without magnetic or ultralow magnetic fields and suppressible electromagnetic noise signal interference. Electromagnetic shielding techniques include active shielding and passive shielding techniques, which can eliminate environmental magnetic field noise and background magnetic field interference of various scientific instruments and biomedical equipment, and are widely applied to high-sensitivity electronic equipment such as low-temperature current comparators, superconducting quantum interferometers, fluxgate sensors, optical pump magnetometers, ultra-low field magnetic resonance imaging and the like.
The precision and response speed of the active shielding technology generally need an accurate control system, have a complex structure and are not suitable for medium-high frequency magnetic fields. Passive or passive magnetic shielding technology utilizes superconducting high-conductivity materials to spontaneously generate induced current under an external field to counteract a magnetic field, and a superconducting passive shielding device based on a superconductor is already practically applied and mainly comprises a superconducting block material processed into a long tube shape or a superconducting wire wound into a coil.
For the magnetic shielding coil formed by winding the superconducting wire strip, because of the existence of inevitable welding joints, the superconducting wire such as REBCO strip has large joint resistance at the welding position, the magnetic shielding performance of the coil is seriously influenced, and particularly in a low-frequency magnetic field environment, so the welding process, the winding process and the quench protection of a large magnetic shielding coil become huge problems. For the magnetic shielding device composed of the block superconductor, due to the limitation of the existing superconducting block material preparation process, the problems of limited superconducting performance, poor thermal stability and the like exist in the material, and the large-size superconducting block is difficult to obtain, so that the magnetic shielding device has great restrictions on the shielding factor, the working magnetic field range, the shielding space and the like of the corresponding magnetic shielding device.
Disclosure of Invention
In order to solve the problem that the prior tubular superconducting block is difficult to develop a high-performance and large-aperture shielding device in the prior art, the invention aims to overcome the defects of weak magnetic shielding performance, complex superconducting coil structure and limitation of bending radius of the passive magnetic shielding technology in a low-frequency region in the prior art, and provides a non-resistance passive magnetic shielding device with a high-temperature superconducting ring sheet stacking structure.
In order to achieve the purpose, the invention adopts the following technical scheme:
a resistance-free passive magnetic shielding device with a high-temperature superconducting ring sheet stacking structure is made of the following materials and has the following structure:
the single superconducting ring sheet is a thin sheet formed by cutting a high-temperature superconducting coated conductor;
a series of superconducting ring sheets form a magnetic shielding stacked structure.
Preferably, the high-temperature superconducting coated conductor adopts a superconducting coated conductor with the critical temperature not lower than 40K, including but not limited to YBCO strips and iron-based superconductors.
Preferably, laser cutting, mechanical die cutting or other cutting methods are adopted along with the cutting mode of the high-temperature superconducting coated conductor.
Preferably, the single superconducting ring piece is a superconducting piece with a central hole structure, and the shape of the outer edge and the central hole of the superconducting ring piece is circular, square or other polygons.
Further preferably, the superconducting ring piece is a circular ring shape with concentric circles inside and outside or a perforated square piece shape with outside and inside circles. The single superconducting ring sheet as the basic stacking unit is formed by cutting and processing the high-temperature superconducting tape in batches. The ring sheet can be cut into a circular ring shape with concentric circles inside and outside or a square sheet shape with holes outside the inside and outside, and other shapes which are beneficial to shielding. With regard to the selection of the inner and outer diameters and dimensions of the individual ring segments, it is preferable to have as small an inner diameter and a large outer diameter as possible.
Still further preferably, when the superconducting annular sheet is in the shape of a circular ring with concentric circles inside and outside, the inner diameter dimension is not more than half of the outer diameter dimension.
Preferably, the magnetic shield stack structure is of a compact type or a non-compact type; wherein the non-compact type adopts a discrete type, a split type and other non-compact shapes; preferably, the discrete type is that a gap is formed between any two adjacent superconducting ring pieces, and the gap distance is adjustable; the split type is an open type structure consisting of at least two tightly stacked assemblies; preferably, a gap is formed between the superconducting ring sheet on the outer side of the close stacking assembly and other superconducting ring sheets which do not belong to the close stacking assembly, and the gap distance is adjustable; or, preferably, at least one close stacking assembly and at least one superconducting ring sheet are stacked in a mixed mode, a gap is formed between the superconducting ring sheet on the outer side of the close stacking assembly and other superconducting ring sheets which do not belong to the close stacking assembly, and the gap distance is adjustable.
Further preferably, when the magnetic shield stack structure takes a non-compact stack form, filling of the filler is performed in the void region.
Preferably, the central axis of the magnetic shielding stacking structure is in a linear type, a zigzag type, an arc type, an annular type or other curve types;
preferably, the magnetic shielding stacking structure adopts a stacking mode of annular staggered stacking at any angle between circular or other non-circular superconducting sheets;
preferably, the spacing distances of different adjacent sheets of superconducting loops are the same or different;
preferably, the different sheets of superconducting rings are the same or different in size;
preferably, adjacent superconducting ring sheets are stacked and assembled by adopting the minimum distance allowed by refrigeration and superconducting performance;
preferably, the superconducting ring sheets are demagnetized before the assembly of the magnetic shielding stacked structure.
Preferably, a plurality of magnetic shielding superconducting ring sheets are stacked and assembled, and the stacking structure adopts a simple stacking type, a split type stacking type or a discrete type stacking type, and the specific steps are as follows:
(a) for the simple stacking structure of the superconducting ring sheets, the adjacent superconducting ring sheets are stacked and assembled by adopting the minimum distance allowed by refrigeration and superconducting performance, and the stacking structure is beneficial to assembly and refrigeration, so that small equipment space is provided;
(b) the split type stacking structure of the superconducting ring sheet is a semi-open type structure formed by combining two close type stacking bodies with certain gaps or a semi-open type structure formed by combining a plurality of close type stacking bodies with certain gaps, has high shielding coefficient and large shielding space, and is easy to disassemble, assemble and test;
(c) for the discrete stacking structure of the superconducting ring sheets, the adjacent superconducting ring sheets are stacked and assembled by adopting the distance which is allowed by refrigeration and superconducting performance and can be adjusted randomly, and the stacking structure can be expected to realize extremely high shielding effect by using fewer superconducting ring sheets.
The invention can obtain the magnetic shielding device of the type by stacking and assembling the superconducting ring sheets with proper structures after batch demagnetization treatment.
Preferably, a split type stacking structure consisting of two close stacking assemblies is adopted, the distance between adjacent superconducting ring sheets in the close stacking assemblies is not more than 0.1mm, a gap between the superconducting ring sheet outside the close stacking assemblies and other superconducting ring sheets not belonging to the close stacking assemblies is at least 4mm, and the total length of the magnetic shielding stacking structure is at least 54 mm.
Compared with the prior art, the invention has the following obvious and prominent substantive characteristics and remarkable advantages:
1. the superconducting ring sheet used by the invention can be directly obtained by a high-temperature superconducting tape produced commercially, has simple structure and convenient processing, and is not limited by the bending radius;
2. after the superconducting ring sheets are stacked, the superconducting ring sheets can generate extremely high magnetic shielding performance, a high working magnetic field range and low-frequency magnetic shielding capability;
3. the stacked structure of the invention provides great adjustment space and freedom, so that the device is extremely flexible, and the adjustment of shielding performance and the customization of some complex shielding functions are facilitated.
Drawings
Fig. 1 is a schematic diagram of a cutting process of a single superconducting loop sheet according to a preferred embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a superconducting annular sheet and a stacking assembly method according to a first embodiment of the invention.
Fig. 3 is a schematic view of the structure of a stack according to a second embodiment of the present invention.
Detailed Description
In a preferred embodiment of the present invention, a non-blocking passive magnetic shielding device with a high temperature superconducting ring sheet stacking structure is made of the following materials and has the following structure:
the single superconducting ring sheet is a thin sheet formed by cutting a high-temperature superconducting coated conductor;
a series of superconducting ring sheets form a magnetic shielding stacked structure.
The magnetic shielding device of the embodiment can be directly made of a high-temperature superconducting tape, is simple in structure and convenient to process, and has the advantages of high-efficiency magnetic shielding and low-frequency magnetic shielding capability.
The high-temperature superconducting coated conductor adopts a superconducting coated conductor with the critical temperature not lower than 40K, and comprises but is not limited to YBCO strips and iron-based superconductors.
The cutting mode of the high-temperature superconducting coated conductor adopts laser cutting, mechanical die cutting or other cutting methods.
The single superconducting ring piece is a superconducting piece with a central hole structure, and the shapes of the outer edge and the central hole of the superconducting ring piece are circular, square or other polygons. The superconducting ring sheet is in a circular ring shape with concentric circles inside and outside or in a square sheet shape with holes outside the inside. When the superconducting ring sheet is in a ring shape with concentric circles inside and outside, the size of the inner diameter is not larger than half of the size of the outer diameter.
The magnetic shielding stacking structure is compact or non-compact; wherein the non-compact type adopts a discrete type, a split type and other non-compact shapes; the discrete type is that a gap is formed between any two adjacent superconducting ring pieces, and the gap distance is adjustable; the split type is an open type structure consisting of at least two tightly stacked assemblies; gaps are reserved between the superconducting ring sheets outside the tightly stacked assembly and other superconducting ring sheets not belonging to the tightly stacked assembly, and the gap distance is adjustable; or the at least one close stacking assembly and the at least one superconducting ring sheet are stacked in a mixed mode, gaps are formed between the superconducting ring sheets on the outer side of the close stacking assembly and other superconducting ring sheets which do not belong to the close stacking assembly, and the gap distance is adjustable. When the magnetic shield stacking structure adopts a non-compact stacking form, filling of the filler is performed in the void region.
The central axis of the magnetic shielding stacking structure is in a linear type, a fold line type, an arc type, an annular type or other curve types; the magnetic shielding stacking structure adopts a stacking mode of annular staggered stacking at any angle between circular or other non-circular superconducting sheets; the spacing distances between different adjacent superconducting ring sheets are the same or different; the sizes of different superconducting ring sheets are the same or different; adjacent superconducting ring sheets are stacked and assembled by adopting the minimum distance allowed by refrigeration and superconducting performance; before assembling the magnetic shielding stacked structure, the superconducting ring sheets are demagnetized.
The split type stacked structure formed by two tightly stacked assemblies is adopted, the distance between adjacent superconducting ring pieces in the tightly stacked assemblies is not more than 0.1mm, gaps between the superconducting ring pieces outside the tightly stacked assemblies and other superconducting ring pieces not belonging to the tightly stacked assemblies are at least 4mm, and the total length of the magnetic shielding stacked structure is at least 54 mm.
The above-described scheme is further illustrated below with reference to specific embodiments, which are detailed below:
the first embodiment is as follows:
referring to fig. 1-2, the device structure of the present embodiment has the following specific design parameters:
the elementary stacked unit superconducting annular sheets 2 are cut in batches from YBCO tape 1 40mm wide, as shown in fig. 1.
All superconducting sheets 2 have the same specification, and are in the shape of a ring sheet with an outer square and an inner circle, the inner diameter is 20mm, and the outer edge length is 40 mm.
The total number of the superconducting ring sheets is 500, a split type stacking structure consisting of two simple stacking bodies is adopted, the distance between the adjacent ring sheets is 0.1mm, the central gap is 4mm, and the total length of the ring sheet stacking body 3 is 54 mm.
The shielding factor near the central point of the central axis 3 of the device can reach 1 multiplied by 10-4The following. The superconducting ring sheets of the embodiment can generate extremely high magnetic shielding performance and high working magnetic field after being stackedRange, and low frequency magnetic shielding capability.
Example two:
this embodiment is substantially the same as the first embodiment, and is characterized in that:
referring to fig. 3, the device structure of the present embodiment has the following specific design parameters:
the present example uses the same YBCO strip 1 as in the first example, and the cutting process is shown in fig. 1.
All the superconducting sheets 2 have the same specification, are in the shape of annular sheets with the outer square and the inner circle, the inner diameter is 4mm, and the outer side length is 20 mm.
The total number of the superconducting annular sheets is 30, a discrete stacking structure is adopted, the annular sheets mutually have a certain distance to form an arc, and the radius of the arc is 150 mm.
The shielding factor near the central arc line 3 of the device can reach 1 multiplied by 10-4The following. The superconducting ring sheet used in the embodiment can be directly obtained from a high-temperature superconducting tape produced commercially, has a simple structure, is convenient to process, and is not limited by the bending radius; the superconducting ring sheets of the embodiment can generate extremely high magnetic shielding performance, high working magnetic field range and low-frequency magnetic shielding capability after being stacked
Example three:
this embodiment is substantially the same as the previous embodiment, and is characterized in that:
in this embodiment, the two close stacking assemblies and the two superconducting ring pieces are adopted for hybrid stacking in this embodiment, and a gap is formed between the superconducting ring piece outside the close stacking assembly and the other superconducting ring pieces that do not belong to this close stacking assembly, and the gap distance is adjustable. The stacked structure of the embodiment provides a large adjustment space and freedom, so that the device is very flexible, and adjustment of shielding performance and customization of some complex shielding functions are facilitated.
Example four:
this embodiment is substantially the same as the previous embodiment, and is characterized in that:
in the present embodiment, when the magnetic shield stack structure takes the non-close type stack form, filling of the filler is performed in the void region. Through filling, the strength of the connecting structure of the adjacent superconducting ring sheets is enhanced, and the integrity effect of the stacked body is improved. The magnetic shielding device of the embodiment can be directly made of a high-temperature superconducting tape, is simple in structure and convenient to process, and has the advantages of high-efficiency magnetic shielding and low-frequency magnetic shielding capability.
The high-efficiency non-resistance passive magnetic shielding device of the embodiment is formed by stacking ring sheets with different structures based on a high-temperature superconducting tape and a superconducting ring sheet obtained by cutting and processing the high-temperature superconducting tape by a proper method. The single superconducting ring piece can be in a ring shape formed by concentric circles inside and outside, or in a shape of an inner circle and an outer circle. The stacking mode of the ring sheets can be a compact type with minimum spacing, a discrete type with adjustable spacing, a split type with a certain gap formed by combining two or more compact stacks, and the like. The magnetic shielding device of the embodiment has the advantages of simple structure, convenience in manufacturing, flexible functions and the like, and the devices with various stacking structures are proved to have extremely high axial shielding coefficient and high working magnetic field compared with the tubular superconducting block shielding device, and have excellent low-frequency shielding performance compared with the shielding device based on the normal conducting coil and the jointed superconducting coil.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made according to the purpose of the invention, and any changes, modifications, substitutions, combinations or simplifications made according to the spirit and principle of the technical solution of the present invention should be replaced with equivalents as long as the object of the present invention is met, and the technical principle and the inventive concept of the present invention are not departed from the scope of the present invention.
Claims (10)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN120035114A (en) * | 2025-04-23 | 2025-05-23 | 北京航空航天大学 | A spliced high-temperature superconducting magnetic shielding device and a combined device |
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Patent Citations (9)
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| JPH0563389A (en) * | 1991-09-04 | 1993-03-12 | Dowa Mining Co Ltd | Superconducting magnetically shielding body |
| JPH05220125A (en) * | 1992-02-12 | 1993-08-31 | Dowa Mining Co Ltd | Superconducting magnetic shielding body |
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| CN120035114A (en) * | 2025-04-23 | 2025-05-23 | 北京航空航天大学 | A spliced high-temperature superconducting magnetic shielding device and a combined device |
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Application publication date: 20220412 |