依靠传导冷却装置测试MgB_2电线的交流损耗特性

Investigation on the AC loss characteristics of MgB_2 wires by using a conduction cooling device

该实验使用传导冷却装置研究了以铁和铜作为隔离材料的MgB_2的交流损耗特性。通过传导冷却装置将MgB_2电线的工作环境冷却到4K,并采用交流脉冲技术测量并评估了它们在几百毫秒范围内的交流损耗特性。测试结果表明Fe/MgB_2的交流损耗主要产生在铁制隔离材料周围。它的交流损耗是Cu/MgB_2的十倍。在实验中通过使用传导冷却装置记录了交流损耗的测试结果,并且就交流损耗对频率,温度的依赖性也进行了实验,最后对结果进行讨论,并且对该技术进行评估。

In this study, we have experimentally investigated the AC loss characteristics of MgB2 wires with matrix of Fe and Cu by using a conduction cooling device. The conduction cooling device was used to cool te working environment of MgB2 wire to 4K. We also developed our unique test method which was called AC pulse technique to evaluate AC loss characteristics within a few hundred milliseconds. The test results show that the AC loss of the Fe/MgB2 wire is mainly generated in the ferromagnetic Fe matrix. Its AC loss is ten times larger than that of the Cu/MgB2 wire. In this paper, the evaluation technique for AC loss by using the conduction cooling device was described and the test results were discussed.