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Dependence of Transport-Current Losses in {\rm MgB}_{2} Superconducting Wire on Temperature and Frequency

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7 Author(s)
Kajikawa, K. ; Res. Inst. of Supercond. Sci. & Syst., Kyushu Univ., Fukuoka, Japan ; Kawano, T. ; Osaka, R. ; Nakamura, T.
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AC losses of a monofilamentary MgB2 wire in a self-field are experimentally evaluated at several temperatures and frequencies. The alternating transport currents are applied to the straight sample wire, and the AC losses are observed electrically with a lock-in amplifier. The temperature of the sample wire was adjusted by a conduction cooling with gaseous helium, and the stability was below ??0.1 K near a fixed temperature. The temperature dependence of the transport-current losses was roughly explained with a theoretical expression based on the Bean model, though the experimental results of the transport-current losses slightly depend on the frequency.

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:20 ,  Issue: 3 )