NZ617975B2 - Superconducting magnet and nuclear magnetic resonance apparatus - Google Patents
Superconducting magnet and nuclear magnetic resonance apparatus Download PDFInfo
- Publication number
- NZ617975B2 NZ617975B2 NZ617975A NZ61797512A NZ617975B2 NZ 617975 B2 NZ617975 B2 NZ 617975B2 NZ 617975 A NZ617975 A NZ 617975A NZ 61797512 A NZ61797512 A NZ 61797512A NZ 617975 B2 NZ617975 B2 NZ 617975B2
- Authority
- NZ
- New Zealand
- Prior art keywords
- winding
- superconducting
- current
- magnetic field
- superconductor
- Prior art date
Links
- 238000005481 NMR spectroscopy Methods 0.000 title 1
- 238000004804 winding Methods 0.000 claims abstract 41
- 239000002887 superconductor Substances 0.000 claims abstract 14
- 230000005415 magnetization Effects 0.000 claims 1
- 239000003507 refrigerant Substances 0.000 claims 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
- G01R33/381—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using electromagnets
- G01R33/3815—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using electromagnets with superconducting coils, e.g. power supply therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/42—Screening
- G01R33/421—Screening of main or gradient magnetic field
-
- 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
Disclosed is a superconducting magnet. The super conducting magnet is provided with a superconducting winding (2) and an outside AC winding (4) constituted by a superconductor or non-superconductor that is wound coaxially with the superconducting winding (2), outside the superconducting winding (2). Magnetisation of the superconducting magnet is eliminated by applying an AC magnetic field in a direction perpendicular to the direction of magnetisation produced by passing an AC current to the outside AC winding (4). An inside AC winding (7) formed by a superconductor or non-superconductor that is wound coaxially with the superconducting winding (2) is placed inside the superconducting winding (2). The current direction in which current is passed in the outside AC winding (4) and the current direction in which current is passed in the inside AC winding (7) are made to be in mutually opposite directions. Magnetisation of the superconducting magnet is eliminated by applying an AC magnetic field in a direction perpendicular to the direction of magnetisation produced by passing an AC current to the outside AC winding (4). An inside AC winding (7) formed by a superconductor or non-superconductor that is wound coaxially with the superconducting winding (2) is placed inside the superconducting winding (2). The current direction in which current is passed in the outside AC winding (4) and the current direction in which current is passed in the inside AC winding (7) are made to be in mutually opposite directions.
Claims (11)
1. A superconducting magnet, comprising: a superconducting winding composed of a superconductor of a tape wire through which there is applied a DC current supplied from a DC power source; and a magnetic field application unit configured to apply, by applying an AC current supplied from an AC power source, to an AC winding, an AC magnetic field in a direction perpendicular to a direction of magnetization caused in a direction perpendicular to a wider-width surface of the tape wire, by a shielding current in the tape wire of the superconducting winding.
2. The superconducting magnet according to claim 1, wherein the magnetic field application unit applies the AC magnetic field; and has the AC winding to which an AC current is supplied so that current flow directions at an outer side of the superconducting winding and at an inner side thereof are opposite to each other.
3. The superconducting magnet according to claim 1 or 2, wherein the magnetic field application unit has an outer AC winding composed of a superconductor or non-superconductor wound coaxially with the superconducting winding, at an outer side of the superconducting winding; and an AC current is supplied to the outer AC winding.
4. The superconducting magnet according to claim 2 or 3, wherein the magnetic field application unit has an inner AC winding composed of a superconductor or non-superconductor wound coaxially with the superconducting winding, at an inner side of the superconducting winding; and a direction of a current to be supplied to the outer AC winding and a direction of a current to be supplied to the inner AC winding are to be in opposite directions to each other.
5. The superconducting magnet according to claim 1 or 2, wherein the magnetic field application unit has the AC winding composed of a superconductor or non-superconductor wound encircling the superconducting winding in a direction perpendicular to a winding direction of the superconducting winding; and an AC current is supplied to the AC winding.
6. The superconducting magnet according to any one of claims 1 to 5, wherein the superconducting winding is a tape-shaped winding composed of a high temperature superconductor.
7. The superconducting magnet according to any one of claims 1 to 6, wherein the magnetic field application unit gradually attenuates an AC magnetic field to be applied.
8. The superconducting magnet according to any one of claims 1 to 7, further comprising: a temperature control unit configured to raise a temperature of the superconducting winding for a predetermined time period.
9. The superconducting magnet according to claim 8, wherein, the temperature control unit is the AC winding of the magnetic field application unit; and the AC winding and the superconducting winding are arranged to be in a closely contact state.
10. The superconducting magnet according to claim 8 or 9 , wherein the temperature control unit has a pressure control section configured to control a pressure in a housing where the superconducting magnet is accommodated with a refrigerant.
11. A superconducting magnet substantially as herein described with reference to any one of the embodiments illustrated in
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011-111708 | 2011-05-18 | ||
| JP2011111708 | 2011-05-18 | ||
| PCT/JP2012/062777 WO2012157745A1 (en) | 2011-05-18 | 2012-05-18 | Superconducting magnet and nuclear magnetic resonance device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| NZ617975A NZ617975A (en) | 2015-12-24 |
| NZ617975B2 true NZ617975B2 (en) | 2016-03-30 |
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