Title :
Dependence of Transport-Current Losses in
Superconducting Wire on Temperature and Frequency
Author :
Kajikawa, Kazuhiro ; Kawano, Tomohiro ; Osaka, Ryota ; Nakamura, Taketsune ; Sugano, Michinaka ; Takahashi, Masaya ; Wakuda, Tsuyoshi
Author_Institution :
Res. Inst. of Supercond. Sci. & Syst., Kyushu Univ., Fukuoka, Japan
fDate :
6/1/2010 12:00:00 AM
Abstract :
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.
Keywords :
Bean model; amplifiers; losses; magnesium compounds; superconducting materials; AC losses; Bean model; MgB2; alternating transport currents; conduction cooling; gaseous helium; lock-in amplifier; monofilamentary wire; superconducting wire; transport-current losses; AC loss; alternating transport current; lock-in amplifier; magnesium-diboride monofilamentary wire;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2009.2039746