Evaluation of thermal-electromagnetic properties of superconducting coil separating two risk factors of magnetic fields and temperature and its optimal design

点击翻译按钮获取中文摘要

In order to improve performance of superconducting coils, the new method to design the coils has been proposed. The method is based on a new idea thatthe maximum magnetic fields and the highest temperature areas are separated. Firstly, a measuring method of profile of Poynting’s vector around superconducting tapes or coils has been developed. In addition, a method to estimate local loss generation in windings has been established by applying Poynting’s vector method. Secondary, it was clarified that a test conductor composed of five MgB_2tapes has high stability, which is equal or more than that of NbTi Rutherford cable with high stability due to low resistive contact between strands. Finally, a new loss reduction method suppressing changes of magnetic fields has been proposed. And then the validity of the method has been experimentally confirmed by using Bi-2223 coil wound.