Superconductive magnet having shim coils and quench protection c

Details Superconductive magnet having shim coils and quench protection c Superconductive magnet having shim coils and quench protection c

1986-05-27

1987-08-25

Hix, L. T.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Superconductor protective circuits

361141, 335216, H01F 722

Patent

active

046897070

ABSTRACT:
A superconductive magnet has a main coil for creating a primary magnetic field and a plurality of shim coils for correcting aberrations in different gradients in the primary field. The shim coils are also connected in shunt with shim quench heaters and with superconductors which together with the shim coils form a plurality of persistent loops. A plurality of protective heaters are electrically connected to the main coil and are thermally connected to the superconductors. When quenching begins in the main coil, current is diverted through the protective heaters causing them to heat. This increases the temperature of the superconductors in the persistent loops causing them to switch from the superconductive to the resistive state and divert current into the shim quench heaters. These heaters in turn heat the shim coils and drive the shim coils resistive to safety dissipate any energy therein.

REFERENCES:
patent: 3304466 (1967-02-01), Minnich et al.
patent: 3466504 (1969-09-01), Hart, Jr.
patent: 3474294 (1969-10-01), Weaver et al.
patent: 3579035 (1971-05-01), Thairy et al.
patent: 3711744 (1973-01-01), Luton
patent: 4349853 (1982-09-01), Sato
patent: 4559576 (1985-12-01), Ries

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