Performance of MgB<sub>2</sub> Superconductor Developed for High-Efficiency Klystron Applications
Hideki Tanaka, Takaaki Suzuki, Motomune Kodama, T. Koga, Hiroyuki Watanabe, A. Yamamoto, Shinichiro Michizono
Abstract
An 8-km long MgB <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> wire for a prototype klystron magnet was made and evaluated. The wire was made by a typical in situ method; it has 10 filaments and 0.67 mm in outer diameter. The homogeneity of I <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> of this wire was evaluated by several methods. Deviation of I <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> values in short sample wires was very small. In addition, the current sharing temperature of the MgB <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> magnet (made of two reels of wire 2.9 km long each) agreed well with the estimated value of the I <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> -B-T properties in short sample wires. Based on the obtained results, it can be said that the I <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> properties of the entire wire length are quite uniform.