Patent ID: 8405410

Claim:
A superconducting coil quench detection apparatus comprising: a quench detection signal generation section configured to detect a variation of a balance voltage of a bridge circuit consisting of a superconducting coil and a resistor and to output the detected variation as a quench detection signal for detecting quench of the superconducting coil; a hold period signal generation section configured to generate a hold period signal indicating a hold period during which energy accumulated in the superconducting coil is held; an abnormality judgment signal extraction section configured to extract a signal included in the hold period among the quench detection signal as an abnormality judgment signal; and a quench detection section configured to detect quench of the superconducting coil based on the abnormality judgment signal wherein the abnormality judgment signal is extracted from a period in a predetermined time from an end of the hold period which is before a discharge period in which energy accumulated in the superconducting coil is discharged.