Dependence of Transport-Current Losses in MgB2 Superconducting Wire on Temperature and Frequency

作者：Kajikawa Kazuhiro^*; Kawano Tomohiro; Osaka Ryota; Nakamura Taketsune; Sugano Michinaka; Takahashi Masaya; Wakuda Tsuyoshi

来源：IEEE Transactions on Applied Superconductivity, 2010, 20(3): 2111-2114.

DOI：10.1109/TASC.2009.2039746

• AC loss
• alternating transport current
• lock-in amplifier
• magnesium-diboride monofilamentary wire

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.

• 出版日期2010-6