Quench protection for actively shielded magnets

Details Quench protection for actively shielded magnets Quench protection for actively shielded magnets

1996-02-22

1997-07-01

Arana, Louis M.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324319, G01V 300

Patent

active

056442335

ABSTRACT:
This invention is concerned with actively shielded magnetic resonance (MR) devices and more particularly with protecting such systems in the event of a quench by preventing changes in the stray field outside the magnetic devices. The invention includes dividing the system's coils into groups each comprised of inner and outer coils and arranged so that the net dipole moment, and the contribution to stray field from each group is always close to zero. Each group is connected in parallel to a protective unit, for example a resistor, so that the excess current can flow through the protective unit in the event of a quench; thus avoiding the burnout of the system's coils.

REFERENCES:
patent: 4926289 (1990-05-01), Reichert
patent: 4956608 (1990-09-01), Dorri et al.
patent: 5012217 (1991-04-01), Palkovich et al.
patent: 5329266 (1994-07-01), Soeldner et al.
patent: 5343182 (1994-08-01), Ohta
patent: 5426366 (1995-06-01), Overweg et al.

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