Actively shielded, superconducting magnet of an NMR tomography a

Details Actively shielded, superconducting magnet of an NMR tomography a Actively shielded, superconducting magnet of an NMR tomography a

1988-07-13

1990-05-15

Pellinen, A. D.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Including superconductivity

324319, 335216, 505844, 505879, 505880, 336DIG1, G01R 3320, H01F 722

Patent

active

049262890

ABSTRACT:
An actively shielded, superconducting magnet of a nuclear magnetic resonance tomography apparatus has an inner coil system and an outer coil system connected in series to avoid an increase in the external field upon the quench of one of the coil systems. To avoid losing the protection of the shielding effect from external magnetic field disturbances, a superconducting current limiter having a low critical current-carrying capability is connected in the coil system to guide a difference current between the inner coil system and the outer coil system. To avoid an unwanted increase in the external field in the event of a quench of one of the coil systems, the current limiter becomes normally conductive in the presence of a current difference larger than a prescribed value.

REFERENCES:
patent: 2978664 (1961-04-01), Walters
patent: 3466504 (1969-09-01), Hart, Jr.
patent: 3839689 (1974-10-01), Biltcliffe et al.
patent: 4237507 (1980-12-01), Meierovich et al.
patent: 4559576 (1985-12-01), Ries
patent: 4680666 (1987-07-01), Rios
"Considerations In the Design of MRI Magnets with Reduced Stray Fields" Hawksworth et al, preprint Applied Superconductivity Conference, Baltimore MD, Sep. 28-Oct. 3, 1986.

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