Abstract
A method to detect a quench of superconducting magnets by acoustic resonance is presented. This technique utilizes the change of propagation characteristics of acoustic wave which is injected by a piezoelectric element (driver) into a superconducting magnet. The injected acoustic wave travels through the magnet, and is received by another piezoelectric element (receiver) attached to the magnet. The amplitude and the phase of the receiver voltage are affected by induced stress due to a local temperature rise. The experiment shows that a local temperature rise of about 2-3K can be detected by this method.
