Abstract
Application of acoustic emission (AE) measurement to the superconducting magnet is reviewed. Four kinds of applications are available at the moment: (a) Simultaneous measurement of AE and coil voltage, which is used to identify the quench origin. (b) Measurement of AE count rate during coil charging, appropriate to recognize the general trend of mechanical disturbance occurence in the magnet. (c) Spectrum analysis of an AE signal generated by a vibrator which is suitable for long range diagnosis of the magnet system. (d) Location of electrical breakdown of instrumentation wires. Each of the techniques is briefly reviewed and compared in this paper.
