GB2015260A - Supplying electric current to superconducting coils - Google Patents

Supplying electric current to superconducting coils

Info

Publication number
GB2015260A
GB2015260A GB7905464A GB7905464A GB2015260A GB 2015260 A GB2015260 A GB 2015260A GB 7905464 A GB7905464 A GB 7905464A GB 7905464 A GB7905464 A GB 7905464A GB 2015260 A GB2015260 A GB 2015260A
Authority
GB
United Kingdom
Prior art keywords
diode
persistence
cryostat
conductors
coils
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB7905464A
Other versions
GB2015260B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Varian Medical Systems Inc
Original Assignee
Varian Associates Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US05/879,294 external-priority patent/US4164777A/en
Priority claimed from US05/879,293 external-priority patent/US4173775A/en
Application filed by Varian Associates Inc filed Critical Varian Associates Inc
Publication of GB2015260A publication Critical patent/GB2015260A/en
Application granted granted Critical
Publication of GB2015260B publication Critical patent/GB2015260B/en
Expired legal-status Critical Current

Links

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

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Containers, Films, And Cooling For Superconductive Devices (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)

Abstract

Thermal isolation of a cryostat 1 is improved for a superconducting solenoid 50 having a plurality of separately energizable coils or winding sections by reducing the number n of conductors 129 required to selectively energize the p persistence switches each of which controls a particular winding section so that n<p. In one embodiment a diode is incorporated in series with a heating element of each switch. In another embodiment n(n -1)/2 coils are similarly controlled with n conductors using the time-current response of resistive persistence switches without diodes. Still another embodiment utilizes a binary to hexadecimal converter within the cryostat. Another persistence switch is disclosed which comprises a diode 12 and superconductive wire 16 in thermal contact with the diode. The heat evolved by current through the forward biased diode raises the temperature of the super- conductor above the transition temperature. <IMAGE>
GB7905464A 1978-02-21 1979-02-15 Supplying electric current to super conducting coils Expired GB2015260B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US05/879,294 US4164777A (en) 1978-02-21 1978-02-21 Superconducting switch incorporating a steering diode
US05/879,293 US4173775A (en) 1978-02-21 1978-02-21 Selective excitation of coils comprising a superconducting magnet

Publications (2)

Publication Number Publication Date
GB2015260A true GB2015260A (en) 1979-09-05
GB2015260B GB2015260B (en) 1982-04-21

Family

ID=27128531

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7905464A Expired GB2015260B (en) 1978-02-21 1979-02-15 Supplying electric current to super conducting coils

Country Status (3)

Country Link
DE (1) DE2906040A1 (en)
FR (1) FR2417833B1 (en)
GB (1) GB2015260B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2125632A (en) * 1982-08-09 1984-03-07 Varian Associates Improved method for superconducting magnet shimming
GB2155244A (en) * 1984-02-20 1985-09-18 Mitsubishi Electric Corp Insulating current lead-throughs in superconducting apparatus
US20120182199A1 (en) * 2011-01-14 2012-07-19 Waltop International Corporation Multi-antenna loop layout

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3460231D1 (en) * 1983-02-09 1986-07-24 Bruker Analytische Messtechnik Cooling device for a low temperature magnetic system
US4528532A (en) * 1983-11-18 1985-07-09 General Electric Company Switch for fine adjustment of persistent current loops in superconductive circuits
EP0311294A3 (en) * 1987-10-05 1990-08-22 THE GENERAL ELECTRIC COMPANY, p.l.c. Magnet systems

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3255335A (en) 1964-01-02 1966-06-07 Ion Physics Corp Superconductive switch comprising carbon
US3419904A (en) * 1966-05-05 1968-12-31 Varian Associates Superconductive solenoid having winding segments additionally energized for gradient control
US3577067A (en) * 1966-05-11 1971-05-04 Varian Associates Persistent mode superconductive orthogonal gradient cancelling coils
US3412320A (en) * 1966-05-16 1968-11-19 Varian Associates Cryostat having an effective heat exchanger for cooling its input leads and other leak paths
FR1504537A (en) * 1966-07-20 1967-12-08 Commissariat Energie Atomique Electromagnetic accumulator device
DE2451949C3 (en) 1974-10-31 1981-10-22 Fuji Electric Co., Ltd., Kawasaki, Kanagawa Power supply device for a superconducting magnet coil

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2125632A (en) * 1982-08-09 1984-03-07 Varian Associates Improved method for superconducting magnet shimming
GB2155244A (en) * 1984-02-20 1985-09-18 Mitsubishi Electric Corp Insulating current lead-throughs in superconducting apparatus
US20120182199A1 (en) * 2011-01-14 2012-07-19 Waltop International Corporation Multi-antenna loop layout

Also Published As

Publication number Publication date
DE2906040A1 (en) 1979-08-30
DE2906040C2 (en) 1989-12-14
FR2417833B1 (en) 1986-01-24
GB2015260B (en) 1982-04-21
FR2417833A1 (en) 1979-09-14

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Legal Events

Date Code Title Description
746 Register noted 'licences of right' (sect. 46/1977)

Effective date: 19951127

PE20 Patent expired after termination of 20 years

Effective date: 19990214