Secondary coil circuit for use with a multi-section protected superconductive magnet coil circuit
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H02H-009/00
H01F-007/22
출원번호
US-0983399
(2004-11-08)
발명자
/ 주소
Hollis, Timothy James
Feenan, Peter J.
출원인 / 주소
General Electric Company
인용정보
피인용 횟수 :
27인용 특허 :
15
초록▼
A secondary coil circuit for use with a multi-section protected superconductive magnet coil circuit is disclosed herein. The secondary coil circuit includes two circuit nodes, a ramping switch electrically connected between the two circuit nodes, and a number of secondary coils electrically connecte
A secondary coil circuit for use with a multi-section protected superconductive magnet coil circuit is disclosed herein. The secondary coil circuit includes two circuit nodes, a ramping switch electrically connected between the two circuit nodes, and a number of secondary coils electrically connected between the two circuit nodes. The secondary coils are made of wire having substantially superconductive capability when cooled below a characteristic critical temperature level and conducting electric current below a characteristic critical current level. The secondary coils are sized and positioned relative to the superconductive magnet coils situated in the individual sections of the multi-section protected superconductive magnet coil circuit so as to functionally cooperate with the multi-section protected superconductive magnet coil circuit in producing and maintaining a magnetic field that is substantially homogeneous. In one embodiment, the secondary coil circuit is inductively decoupled from each individual section of the multi-section protected superconductive magnet coil circuit.
대표청구항▼
1. A secondary coil circuit for use with a multi-section protected superconductive magnet coil circuit in a system, said secondary coil circuit comprising:two circuit nodes;a ramping switch electrically connected between said two circuit nodes; anda number of secondary coils electrically connected b
1. A secondary coil circuit for use with a multi-section protected superconductive magnet coil circuit in a system, said secondary coil circuit comprising:two circuit nodes;a ramping switch electrically connected between said two circuit nodes; anda number of secondary coils electrically connected between said two circuit nodes and comprising wire having substantially superconductive capability when cooled below a characteristic critical temperature level and conducting electric current below a characteristic critical current level;wherein said secondary coils are sized and positioned relative to the superconductive magnet coils situated in the individual sections of said multi-section protected superconductive magnet coil circuit so as to functionally cooperate with said multi-section protected superconductive magnet coil circuit in producing and maintaining a magnetic field that is substantially homogeneous.2. A secondary coil circuit according to claim 1, wherein said system is selected from the group consisting of a magnetic resonance imaging (MRI) system, a nuclear magnetic resonance (NMR) spectroscopy system, and a mass spectrometer system.3. A secondary coil circuit according to claim 1, wherein said two circuit nodes include two power connection terminals; andwherein said secondary coil circuit further comprises an electric power supply switchably connected between said two power connection terminals.4. A secondary coil circuit according to claim 1, wherein said ramping switch is a superconductive switch comprising:a superconductive wire electrically connected between said two circuit nodes; andan activatable resistive heater thermally coupled to said superconductive wire for controlling the effective resistance of said superconductive wire.5. A secondary coil circuit according to claim 1, wherein said secondary coils are shim coils for shimming said magnetic field.6. A secondary coil circuit according to claim 1, wherein said secondary coils are external interference shield (EIS) coils for shielding said magnetic field from external disturbances.7. A secondary coil circuit according to claim 1, wherein said secondary coils are electrically connected in series between said two circuit nodes.8. A secondary coil circuit according to claim 1, wherein said wire is composite wire having:an inner filamentary core comprising superconductive material including a niobium-titanium alloy; andan outer cladding layer comprising copper.9. A secondary coil circuit according to claim 1, wherein said secondary coil circuit further comprises a burnout protection circuit electrically connected between said two circuit nodes; andwherein said burnout protection circuit includes a circuit element selected from the group consisting of a resistor and a diode.10. A secondary coil circuit according to claim 1, wherein said number, the physical characteristics, and the positions of said secondary coils are selected to cooperatively minimize mutual induction between each of said individual sections of said multi-section protected superconductive magnet coil circuit and said secondary coil circuit during a quench event in said multi-section protected superconductive magnet coil circuit for thereby preventing electric current in said secondary coil circuit from being induced to rise to a predetermined unstable current level.11. A secondary coil circuit according to claim 10, wherein said physical characteristics of said secondary coils include coil length, coil inner radius, coil outer radius, coil axial location, coil wire length, coil wire diameter, coil wire material composition, number of coil turns, coil turn direction, and coil turn density.12. A secondary coil circuit according to claim 10, wherein said predetermined unstable current level for said secondary coil circuit is substantially commensurate with said characteristic critical current level for said wire of said secondary coils.13. A secondary coil circuit according to claim 1, wherein said secondary coil circuit has a predetermined unstable current level associated therewith; andwherein said wire of said secondary coils is selected such that said characteristic critical current level for said wire is less than said predetermined unstable current level for said secondary coil circuit.14. A secondary coil circuit according to claim 1, wherein said secondary coil circuit further comprises at least one quench-inducing resistive heater thermally coupled to at least one of said secondary coils.15. A secondary coil circuit according to claim 14, wherein each said quench-inducing resistive heater is electrically connected in parallel with at least one of said superconductive magnet coils situated in said multi-section protected superconductive magnet coil circuit; andwherein each said quench-inducing resistive heater is positioned and designed for voltage-activation by said multi-section protected superconductive magnet coil circuit to preemptively initiate quenching in said secondary coil circuit for thereby preventing electric current in said secondary coil circuit from being induced to rise to a predetermined unstable current level during a quench event in said multi-section protected superconductive magnet coil circuit.16. A shim coil circuit for use with a multi-section protected superconductive magnet coil circuit in a cryogen vessel of a system, said shim coil circuit comprising:two power nodes;a ramping switch electrically connected between said two power nodes; anda number of shim coils electrically connected in series between said two power nodes and comprising wire having substantially superconductive capability when cooled below a characteristic critical temperature level and conducting electric current below a characteristic critical current level;wherein said shim coils are sized and positioned relative to the superconductive magnet coils situated in the individual sections of said multi-section protected superconductive magnet coil circuit for thereby shimming a magnetic field produced by said multi-section protected superconductive magnet coil circuit.17. A shim coil circuit according to claim 16, wherein said shim coils are collectively positioned substantially circumjacent to said superconductive magnet coils of said multi-section protected superconductive magnet coil circuit within said cryogen vessel.18. A shim coil circuit according to claim 16, wherein said number, the physical characteristics, and the positions of said shim coils are selected to cooperatively minimize mutual induction between the at least one superconductive magnet coil situated in each of said individual sections of said multi-section protected superconductive magnet coil circuit and said shim coils of said shim coil circuit during a quench event in said multi-section protected superconductive magnet coil circuit for thereby preventing electric current in said shim circuit from being induced to rise to a predetermined unstable current level.19. A shim coil circuit according to claim 18, wherein said physical characteristics of said shim coils include coil length, coil inner radius, coil outer radius, coil axial location, coil wire length, coil wire diameter, coil wire material composition, number of coil turns, coil turn direction, and coil turn density.20. A shim coil circuit according to claim 18, wherein said predetermined unstable current level for said shim coil circuit is substantially commensurate with said characteristic critical current level for said wire of said shim coils.21. A shim coil circuit according to claim 16, wherein said shim coil circuit has a predetermined unstable current level associated therewith; andwherein said wire of said shim coils is selected such that said characteristic critical current level for said wire is less than said predetermined unstable current level for said shim coil circuit.22. A shim coil circuit according to claim 16, wherein said shim coil circuit further comprises at least one quench-inducing resistive heater thermally coupled to at least one of said shim coils.23. A shim coil circuit according to claim 22, wherein each said quench-inducing resistive heater is electrically connected in parallel with at least one of said superconductive magnet coils situated in said multi-section protected superconductive magnet coil circuit; andwherein each said quench-inducing resistive heater is positioned and designed for voltage-activation by said multi-section protected superconductive magnet coil circuit to preemptively initiate quenching in said shim coil circuit for thereby preventing electric current in said shim coil circuit from being induced to rise to a predetermined unstable current level during a quench event in said multi-section protected superconductive magnet coil circuit.24. A method of installing a secondary coil circuit for use with a multi-section protected superconductive magnet coil circuit in a system, said method comprising the steps of:(a) electrically connecting a ramping switch between two circuit nodes;(b) obtaining secondary coils comprising wire having substantially superconductive capability when cooled below a characteristic critical temperature level and conducting electric current below a characteristic critical current level;(c) electrically connecting a number of said secondary coils between said two circuit nodes; and(d) sizing and positioning said secondary coils relative to the superconductive magnet coils situated in the individual sections of said multi-section protected superconductive magnet coil circuit so that said secondary coils functionally cooperate with said multi-section protected superconductive magnet coil circuit in producing and maintaining a magnetic field that is substantially homogeneous.25. A method of installing a secondary coil circuit according to claim 24, wherein said method further comprises the step of:selecting said number, the physical characteristics, and the positions of said secondary coils to cooperatively minimize mutual induction between each of said individual sections of said multi-section protected superconductive magnet coil circuit and said secondary coil circuit during a quench event in said multi-section protected superconductive magnet coil circuit for thereby preventing electric current in said secondary coil circuit from being induced to rise to a predetermined unstable current level.26. A method of installing a secondary coil circuit according to claim 24, wherein said method further comprises the steps of:predetermining an unstable current level for said secondary coil circuit; andexecuting step (b) such that said characteristic critical current level for said wire of said secondary coils is less than said unstable current level predetermined for said secondary coil circuit.27. A method of installing a secondary coil circuit according to claim 24, wherein said method further comprises the steps of:electrically connecting at least one quench-inducing resistive heater in parallel with at least one of said superconductive magnet coils situated in said multi-section protected superconductive magnet coil circuit; andpositioning each said quench-inducing resistive heater proximate to at least one of said secondary coils such that each said quench-inducing resistive heater is thermally coupled to at least one of said secondary coils.
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