【摘要】 本论文对高温超导磁体在传输直流电流时产生的损耗进行了理论分析和实验验证.本文考虑了高温超导带材非线性模型磁场方向对带材临界电流和n值的影响,用Bi2223超导带材绕制了(一个由20个双饼组成的高温超导磁体,用数值仿真和实验方法研究了此磁体传输直流电流时的指数损耗.并对每个双饼以及每匝线圈的损耗进行了分析.在液氮温度下对一个双饼线圈进行了指数损耗的测量,测量结果与数值仿真结果相当吻合.利用高温超导体临界电流此非线性模型,本文对此磁体快速励磁情况下的交流损耗的特点进行了数值模拟.更多还原

【Abstract】 The loss characteristic of high temperature superconducting (HTS) magnet carrying DC transport current was theoretically and experimentally studied. A HTS magnet is designed with Bi2223 superconductors wound including 20 double-pancake coils. The index loss of the HTS magnet carrying DC transport current is analyzed using numerical simulation and experiment. The index losses of every double-pancake coil and turn are calculated. The index loss of a double pancake coil in the liquid nitrogen temperature is obtained by experiment. The measured data reasonably agree with the simulation results. The implemented nonlinearmodel of HTS tapes takes into account the B-dependence of the critical current density J_ c and the power index n. The AC loss of the HTS magnet during rapid current excitation was calculated using the numerical method on the basis of the nonlinearmodel of HTS tapes.更多还原