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Detection of 'hot spots' in HTS coils and test samples with acoustic emission signals

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4 Author(s)
Haigun Lee ; MIT Francis Bitter Magnet Lab., Cambridge, MA, USA ; Ho Min Kim ; Jankowski, J. ; Iwasa, Y.

In this paper we report results of two series of experiments, one performed on a double-pancake coil wound with Bi2223/Ag tape and the other on coated YBCO samples to demonstrate that an acoustic emission (AE) technique is a promising diagnostic tool to detect the presence of a "hot spot" in HTS devices. The AE technique may be used as complement to standard voltage technique to facilitate early detection of the presence of a "hot spot" in HTS devices and thus help to protect the HTS devices from permanent damage.

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Applied Superconductivity, IEEE Transactions on  (Volume:14 ,  Issue: 2 )