The effectiveness of pulsed-field magnetization with respect to different performance bulk superconductors
The effectiveness of pulsed-field magnetization with respect to different performance bulk superconductors
复制标题
脉冲场磁化对于不同性能块体超导体的有效性
DOI：
10.1007/s10948-011-1211-8
复制
发表时间：
2012
影响因子：
1.8
通讯作者：
M.Izumi
中科院分区：
文献类型：
--
作者：
Z.Deng;M.Miki;B.Felder;K.Tsuzuki;N.Shinohara;R.Taguchi;K.Suzuki;M.Izumi
脉冲场磁化是一种实用的块体激活技术，特别是作为一种廉价、小体积、可移动的实验装置。为了利用该方法，以四个具有不同捕获磁通性能的样品为代表，检验了该方法对块体超导体的激励效果。PFM实验是在液氮温度(77℃)下用一对涡流型铜线圈进行的。通过逐步增加外加电场的多重PFM方法获得了四种样品的最大捕集磁通性能。通过与它们的静电场冷却磁化(FCM)捕获磁通结果的比较，分析了不同性能块体超导体的PFM的有效性。研究发现，随着整体性能的提高，PFM结果与FCM结果的偏差越来越大，表明PFM方法对块体样品的激发有更大的难度。讨论了脉冲产生热的可能原因，并对实际应用中的PFM工艺改进提出了一些建议。
Pulsed-field magnetization (PFM) is one of the practical activation techniques for bulk applications, especially as an inexpensive, small-volume, and mobile experimental setup. To utilize the method, its effectiveness to excite the bulk superconductors was examined by four samples with different trapped-flux performance as representatives. The PFM experiments were conducted with a pair of vortex-type copper coils at liquid nitrogen temperature (77 K). The utmost trapped-flux performance of the four samples was obtained by a multi-PFM method with progressively increased applied fields. By comparison with their trapped-flux results of static field-cooling magnetization (FCM), the effectiveness of PFM according to different performance bulk superconductors was analyzed. It was found that with the improvement of the bulk performance, the PFM results start to deviate from the FCM ones more and more, indicating a harder tendency to excite the bulk samples by the PFM method. The possible explanations from heat generation during the pulse and some suggestions to the improvement of the PFM process for practical applications are discussed.