quench

A quench is an abnormal termination of magnet operation that happens when part of the superconducting coil goes back to its normal (resistive) state. This can happen if the field inside the magnet is too large, the rate of change of field is too large (causing eddy currents and heating in the copper support matrix), or a combination of the two. More rarely a defect in the magnet can cause a quench. 

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