CN109712773A - A kind of high field nuclear magnetic resonance superconducting magnet - Google Patents
A kind of high field nuclear magnetic resonance superconducting magnet Download PDFInfo
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- CN109712773A CN109712773A CN201811601119.9A CN201811601119A CN109712773A CN 109712773 A CN109712773 A CN 109712773A CN 201811601119 A CN201811601119 A CN 201811601119A CN 109712773 A CN109712773 A CN 109712773A
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Abstract
A kind of high field nuclear magnetic resonance superconducting magnet, including low-temperature superconducting provided magnet, high-temperature superconductor interpolation magnet and superconduction shim coil.Inside the high-temperature superconductor interpolation magnet insertion low-temperature superconducting provided magnet, high-temperature superconductor interpolation magnet and low-temperature superconducting provided magnet are concentric.The magnetic field of low-temperature superconducting provided magnet and the magnetic field superposition of high-temperature superconductor interpolation magnet generate very high strength magnetic field in central area.Superconduction shim coil is placed in the gap between low-temperature superconducting provided magnet and high-temperature superconductor interpolation magnet.Superconduction shim coil is pasted onto high-temperature superconductor interpolation magnet periphery；Superconduction shim coil, low-temperature superconducting provided magnet and high-temperature superconductor interpolation magnet are concentric.
Description
Technical field
The present invention relates to a kind of nuclear magnetic resonance spectrometer superconducting magnets.
Background technique
Nuclear magnetic resonance is a kind of radio frequency electromagnetic that specific frequency is absorbed by atomic nucleus, externally emits signal, by penetrating
Frequency coil receives a kind of noninvasive technique means that signal carrys out analyzing molecules structural information.In nuclear magnetic resonance spectrometer system,
Main magnet is an important component.Main magnet generates uniform high-intensity magnetic field, so that the orderly precession of atomic nucleus, precession frequency and magnetic field
Intensity is directly proportional.Since the atom in different chemical environments is influenced difference, precession frequency by neighboring atom electromagnetic action
It has differences, these differences can show in the atom spectroscopic signal received.
The signal sensitivity and resolution ratio of nuclear magnetic resonance increase with the increase of magnetic field strength, it means that script low field
The microelement that can't detect is able to detect out under High-Field, the atomic group structure that script low field can not be identified energy under High-Field
Enough distinguish.In view of the advantage of high-field nuclear magnetic resonance wave spectrum detection, various countries continue to develop in high field magnet technology.
When magnetic field strength is lower than 18T, low-temperature superconducting wire NbTi or NbTi and Nb can be used3Sn in conjunction with mode come
Design superconducting magnet.Using superfluid helium cooling means, when liquid helium temperature is reduced to 1.8K from 4.2K, Nb3Sn superconducting magnet can
Generate the magnetic field strength of 22.3T.However, needing to realize by high-temperature superconducting magnet to pursue higher magnetic field strength.It is right
In high field superconducting magnet, for example 27T, generally uses the combination of low-temperature superconducting provided magnet interpolation high-temperature superconducting magnet,
Wherein cryogenic magnet provides a background magnetic field, and high-temperature superconducting magnet generates superposition magnetic field.
High-performance nuclear magnetic resonance spectrometer system not only needs very high magnetic field strength, and magnetic field will also have very in detection zone
The high uniformity, and the magnet structure that low temperature solenoid nesting and the double cakes of high temperature stack is not able to satisfy uniformity of magnetic field requirement.
When designing High Homogeneous Superconducting Magnet, cryogenic magnet bucking coil design structure can be used, high temperature magnet grooving also can be used
Double cake design structures.Bucking coil will increase magnet generation cost, expands magnet volume or reduces magnet inner hole；The double cakes of grooving
It can realize that uniformity of magnetic field is promoted by optimizing and revising the double cake inside radius in part, exceptional space can't be occupied.
United States Patent (USP) US 20070171014A1 proposes the core of a kind of back surface field conductance magnet and interpolation high-temperature superconducting magnet
Nuclear magnetic resonance spectrometer magnet designs, wherein interpolation high-temperature superconducting magnet only has one layer of magnet structure, using outer radius grooving
Shimming mode, and without being laid with shim coil；Chinese patent CN 101577165A is high using low-temperature superconducting provided magnet interpolation
The scheme of temperature superconductive magnet designs superconducting magnet system, and provided magnet is made of 6 layers of low-temperature superconducting coil, one layer of high temperature of interpolation
Superconducting magnet coil, not using uniformity of magnetic field indemnifying measures such as grooving structure, shim coils；United States Patent (USP) US
20150213930A1 has invented a kind of interpolation HTS magnets design scheme of axial current density classification, by axial direction
It is realized on direction using the superconducting tape of different in width.
Summary of the invention
The purpose of the present invention is overcoming the prior art, a kind of high field nuclear magnetic resonance spectrometer magnet is proposed.This hair
The bright design scheme combined using 7 layers of low-temperature superconducting provided magnet and two layers of high-temperature superconductor interpolation magnet, enables central area
Enough generate high field strength.In conjunction with the field compensation method of grooving double cake structure designs and laying shim coil, center magnetic can be improved
Field uniformity is to 1ppm or less.
The high field nuclear magnetic resonance spectrometer magnet of the present invention includes low-temperature superconducting provided magnet, high-temperature superconductor interpolation magnet and surpasses
Lead shim coil.
Inside the high-temperature superconductor interpolation magnet insertion low-temperature superconducting provided magnet, high-temperature superconductor interpolation magnet and low temperature
Superconduction provided magnet is concentric.The magnetic field of low-temperature superconducting provided magnet and the magnetic field superposition of high-temperature superconductor interpolation magnet, in center
Domain generates very high strength magnetic field.Superconduction shim coil is placed in the sky between low-temperature superconducting provided magnet and high-temperature superconductor interpolation magnet
At gap.Superconduction shim coil is pasted onto high-temperature superconductor interpolation magnet periphery.Superconduction shim coil, low-temperature superconducting provided magnet and height
Temperature superconductive interpolation magnet is concentric.
The low-temperature superconducting provided magnet is made of 7 layer line circles, wherein internal 3 layers are NbTi coil, external 4 layers are
Nb3Sn coil.The clear opening diameter of low-temperature superconducting provided magnet is not less than 250mm.It is described after being put into high-temperature superconductor interpolation magnet
High field nuclear magnetic resonance spectrometer magnet warm bore dia be not less than 50mm.
High-temperature superconductor interpolation magnet of the invention Bi-2223 YBCO high-temperature superconductor band coiling includes inside and outside cloth
Two layers of the coil set, two layers of coil is coaxial and low-temperature superconducting provided magnet is concentric.In high-temperature superconductor interpolation magnet inner coil
Position is entreated to use the double-cake coils of grooving structure, to increase the inside radius of internal layer high temperature superconductor coil central part.It can be according to reality
The requirement of border uniformity of magnetic field, selects the double-cake coils of the even numbers grooving structure such as 2,4,6.Cutting groove depth can pass through reduction
Number of turns controls.The outer radius of grooving structure double-cake coils is identical as normal double-cake coils outer radius.Double-cake coils are cut
Slot structure realizes that the cutting groove depth of realization is m multiplied by superconduction tape thickness by reducing m circle superconductive tape quantity.
According to actual needs, it can choose and be laid with 15 groups of superconduction shim coils, including axial 3 groups of shim coils Z, Z2, Z3
With radial 12 groups of shim coil X, Y, ZX, ZY, X2-Y2, XY, Z2X, Z2Y, Z (X2-Y2), ZXY, X3, Y3.Shim coil is used
Nb3Sn superconducting line coiling.15 groups of superconduction shim coils according to axial 3 groups of shim coils Z, Z2, Z3, radial 12 groups of shim coil X,
Y, the sequence stacked arrangement of ZX, ZY, X2-Y2, XY, Z2X, Z2Y, Z (X2-Y2), ZXY, X3, Y3, is pasted onto high-temperature superconductor interpolation
The periphery of magnet.
By for central area generates 27T uniform magnetic field, low-temperature superconducting provided magnet of the present invention can produce 15T intensity
Background magnetic field, the remaining magnetic field 12T are generated by high-temperature superconducting magnet.Low-temperature superconducting provided magnet generates 15T's in central area
When background magnetic field, maximum of hoop stress is controlled within 150MPa.Maximum magnetic field strength inside NbTi superconducting coil is 8.8T,
Nb3Maximum magnetic field strength inside Sn superconducting coil is 15.3T.
High-temperature superconductor interpolation magnet includes two layers of Bi-2223 superconducting tape magnet or two layers of YBCO superconducting tape magnet.
Double-cake coils are supported with cylinder frame, and outer layer is bound with steel band.Skeleton thickness is not less than 2mm, and binding thickness is not less than 5mm.It is right
For Bi-2223 interpolation magnet, maximum of hoop stress is controlled within 300MPa；It is maximum for YBCO interpolation magnet
Circumference stress controls within 400MPa.
Detailed description of the invention
Fig. 1 is superconducting magnet of NMR schematic diagram, and 1,2,3 be Nb3The provided magnet coil of Sn superconducting line coiling, 4,5,
6,7 be the coiling of NbTi superconducting line provided magnet coil, 8,9 be the coiling of high-temperature superconductor band interpolation magnet coil, 10 are
Nb3The shim coil of Sn coiling；
Fig. 2 is low-temperature superconducting provided magnet schematic diagram；
Fig. 3 is the magnetic field aberration curve that low-temperature superconducting provided magnet generates in central area；
Fig. 4 a is the section schematic diagram of grooving structure double-cake coils radially, and Fig. 4 b is that grooving structure double-cake coils three-dimensional is shown
It is intended to；
Fig. 5 is Bi-2223 interpolation magnet structure schematic diagram；
Fig. 6 is the magnetic field aberration curve that provided magnet and Bi-2223 interpolation magnet generate in central area；
Fig. 7 is that the current margins of Bi-2223 band are analyzed；
Fig. 8 is YBCO interpolation magnet structure schematic diagram；
Fig. 9 is the magnetic field aberration curve that provided magnet and YBCO interpolation magnet generate in central area；
Figure 10 is that the current margins of YBCO band are analyzed；
Figure 11 is superconduction shim coil stacking mode schematic diagram；
Figure 12 a is axial shim coil schematic diagram, and Figure 12 b is radial shim coil schematic diagram, in figure, 12a axial direction coil,
12b radial coil.
Specific embodiment
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, the high field nuclear magnetic resonance superconducting magnet of the present invention is axially symmetric structure, including low-temperature superconducting back surface field magnetic
Body, high-temperature superconductor interpolation magnet and superconduction shim coil.The high-temperature superconductor interpolation magnet is inserted into low-temperature superconducting provided magnet
Inside, high-temperature superconductor interpolation magnet and low temperature provided magnet are concentric.Superconduction shim coil is placed in high-temperature superconductor interpolation magnet and low
Between temperature superconductive provided magnet, it is pasted onto high-temperature superconductor interpolation magnet periphery.
The magnetic field of low-temperature superconducting provided magnet and the magnetic field superposition of high-temperature superconductor interpolation magnet generate high in central area
Intensity magnetic field.Superconduction shim coil improves uniformity of magnetic field for eliminating the uneven harmonic components of central magnetic field.
The low-temperature superconducting provided magnet is made of 7 layer line circles, by low-temperature superconducting wire coiling.3 layer line circles of internal layer
1,2,3 by NbTi superconducting line coiling, and 4 layer 4 of outer layer, 5,6,7 are Nb3Sn coil, loop construction use solenoid wire wound mode.
The clear opening diameter of low-temperature superconducting provided magnet is not less than 250mm, is used to place high-temperature superconductor interpolation magnet coil 8,9 in aperture.
Spacing between the outer diameter and low-temperature superconducting provided magnet internal diameter of high-temperature superconductor interpolation magnet coil 9 is not less than 15mm.High temperature is super
8 central part of interpolation magnet coil is led using grooving structure, coil 8,9 is coaxial and low-temperature superconducting provided magnet is concentric.High temperature is super
The high-temperature superconductors band coilings such as interpolation magnet coil Bi-2223 or YBCO are led, form magnetic in such a way that double-cake coils stack
Body.Gap between high-temperature superconductor interpolation magnet coil 9 and low-temperature superconducting provided magnet is for placing superconduction shim coil 10.It is super
It leads shim coil 10 and pastes high-temperature superconductor interpolation magnet periphery by the way of stacking.Insertion inside low-temperature superconducting provided magnet
After high-temperature superconductor interpolation magnet, final magnet temperature hole is controlled in 50mm or more.
The magnetic field of low-temperature superconducting provided magnet and high-temperature superconductor interpolation magnet is overlapped mutually, and reaches specified magnetic field strength.
The grooving structure of low-temperature superconducting interpolation magnet makes the significant raising of the central magnetic field uniformity.High-temperature superconductor interpolation magnet coil passes through
The method of number of turns is reduced to control the cutting groove depth of grooving structure double-cake coils.Superconduction shim coil and high-temperature superconductor interpolation
The grooving structure double-cake coils collective effect of magnet so that magnet of the present invention center zone diameter be 10mm sphere in, magnetic
Field uniformity controls within 1ppm.
As shown in Fig. 2, in the low-temperature superconducting provided magnet, from interior preceding outward 3 layers by Nb3Sn coiling, latter 4 layers by NbTi
Coiling.
As shown in figure 3, in the magnetic field strength that central area generates 15T, the magnetic field peak of low-temperature superconducting provided magnet
The peak value uniformity is in 100ppm or so, maximum magnetic field strength 15.3T, maximum of hoop stress 149MPa.
Fig. 4 is the grooving structure section schematic diagram radially and three dimensional structure diagram of double-cake coils.Assuming that normal double
For cake coil by n circle superconductive tape coiling, it is identical with the outer diameter of normal double-cake coils that there are the double-cake coils of grooving structure, then can be with
Realize that a cutting groove depth is grooving of the m multiplied by superconduction tape thickness by reducing m circle coiling amount.
Fig. 5, Fig. 6 and Fig. 7 are Bi-2223 high-temperature superconductor interpolation magnet design and relevant performance evaluation.The interpolation magnetic
Body includes 68 double-cake coils, and wherein inner coil has 32 double cake structure coils, and outer coil has 36 double cake structure coils,
Inner coil and the inside and outside arrangement of outer coil, with one heart.For in the magnetic field strength that central area generates 12T, magnet is at center
The magnetic field peak-to-peak value uniformity in region is in 2ppm or so, and perpendicualr field maximum intensity is 3.52T, and maximum of hoop stress is
294MPa, running current 234.05A, current margins 52.9%.High-temperature superconductor interpolation magnet and low-temperature superconducting provided magnet
Together, the high magnetic field strength of 27T is generated in central area.
As shown in figure 8, the embodiment of high-temperature superconductor interpolation magnet of the present invention includes 56 double cake structure coils, wherein internal layer
Coil has 26 double cake structure coils, and outer coil has 30 double cake structure coils.As shown in Figure 9, Figure 10, in central area
For the magnetic field strength for generating 12T, for the magnetic field peak-to-peak value uniformity of the magnet in central area within 4ppm, perpendicualr field is maximum
Intensity is 3.17T, maximum of hoop stress 376MPa, running current 108.37A, current margins 26.1%.High-temperature superconductor
Interpolation magnet and low-temperature superconducting provided magnet collective effect generate the high magnetic field strength of 27T in central area.
Figure 11 is superconduction shim coil stacking mode schematic diagram.Multiple superconduction shim coil stacked arrangements, are pasted onto high temperature
Superconduction interpolation magnet periphery.As shown in figure 11, in the present embodiment, 15 groups of superconduction shim coils according to axial 3 groups of shim coil Z,
Z2, Z3, radial 12 groups of shim coil X, Y, ZX, ZY, X2-Y2, XY, Z2X, Z2Y, Z (X2-Y2), ZXY, X3, Y3 sequential layer
Stack arrangement is pasted onto the periphery of high-temperature superconductor interpolation magnet.
Figure 12 a is axial shim coil schematic diagram, and Figure 12 b is radial shim coil schematic diagram.According in actual measurement
The Distribution of Magnetic Field in heart district domain does ball frequency analysis, finds out corresponding harmonic component.By adjusting shimming coil current size and side
To corresponding harmonic component is offset in the magnetic field for enabling coil to generate, and achievees the purpose that magnetic field uniformization.
Claims (4)
1. a kind of high field nuclear magnetic resonance superconducting magnet, it is characterised in that: the high field nuclear magnetic resonance superconducting magnet includes
Low-temperature superconducting provided magnet, high-temperature superconductor interpolation magnet and superconduction shim coil；The high-temperature superconductor interpolation magnet insertion is low
Inside temperature superconductive provided magnet, high-temperature superconductor interpolation magnet and low-temperature superconducting provided magnet are concentric；Low-temperature superconducting provided magnet
The magnetic field superposition in magnetic field and high-temperature superconductor interpolation magnet generates very high strength magnetic field in central area；Superconduction shim coil is placed in
Gap between low-temperature superconducting provided magnet and high-temperature superconductor interpolation magnet；Superconduction shim coil is pasted onto high-temperature superconductor interpolation
Magnet periphery；Superconduction shim coil, low-temperature superconducting provided magnet and high-temperature superconductor interpolation magnet are concentric.
2. high field nuclear magnetic resonance superconducting magnet described in accordance with the claim 1, it is characterised in that: the low temperature provided magnet
It is made of 7 layer line circles, wherein internal 3 layers are NbTi coil, external 4 layers are Nb3Sn coil；The clear opening of low-temperature superconducting provided magnet
Diameter is not less than 250mm, after being put into high-temperature superconductor interpolation magnet, the warm bore dia of the high field nuclear magnetic resonance spectrometer magnet
Not less than 50mm.
3. high field nuclear magnetic resonance superconducting magnet described in accordance with the claim 1, it is characterised in that: the high-temperature superconductor interpolation
Magnet Bi-2223 YBCO high-temperature superconductor band coiling, two layers of coil comprising inside and outside arrangement, two layers of coil is coaxial, and
Low-temperature superconducting provided magnet is concentric；Magnet is formed in such a way that double cakes stack.
4. according to high field nuclear magnetic resonance superconducting magnet described in claim 1 or 3, it is characterised in that: the high-temperature superconductor
The inner coil central part of interpolation magnet uses the double-cake coils of grooving structure, to increase internal layer high temperature superconductor coil central portion
The inside radius of position；The double-cake coils of grooving structure are even number, symmetrical；Cutting groove depth is controlled by reducing number of turns
System, the cutting groove depth of realization are m multiplied by superconduction tape thickness.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811601119.9A CN109712773B (en) | 2018-12-26 | 2018-12-26 | Extremely high field nuclear magnetic resonance superconducting magnet |
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| CN201811601119.9A CN109712773B (en) | 2018-12-26 | 2018-12-26 | Extremely high field nuclear magnetic resonance superconducting magnet |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114464445A (en) * | 2021-12-24 | 2022-05-10 | 广东电网有限责任公司 | YBCO high-temperature superconducting energy storage coil winding method and device |
| CN114551026A (en) * | 2022-03-02 | 2022-05-27 | 中国科学院电工研究所 | Superconducting magnet for measuring comprehensive physical properties of low-temperature high-intensity magnetic field and design method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114464445A (en) * | 2021-12-24 | 2022-05-10 | 广东电网有限责任公司 | YBCO high-temperature superconducting energy storage coil winding method and device |
| CN114551026A (en) * | 2022-03-02 | 2022-05-27 | 中国科学院电工研究所 | Superconducting magnet for measuring comprehensive physical properties of low-temperature high-intensity magnetic field and design method thereof |
| CN114551026B (en) * | 2022-03-02 | 2024-02-02 | 中国科学院电工研究所 | Superconducting magnet for low-temperature strong magnetic field comprehensive physical property measurement and design method thereof |
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