Shielding current analysis in HTS 铿乴m containing cracks: application to contactless measurement method of critical current density

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• 作者：A. Kamitani^a ; ^{kamitani@yz.yamagata-u.ac.jp} ; T. Takayama^a ; S. Ikuno^b ; A. Saitoh^c
• 关键词：critical currents ; cuprates ; superconducting 铿乴ms
• 刊名：Physics Procedia
• 出版年：2012
• 期刊代码：P128_18753892
• 类别：ph
• 出版时间：2012
• 卷：27
• 期：Complete
• 页码：320-323
• 文件大小：434 K

摘要

Anumerical method is developed for calculating the shielding current density in a high-temperature superconducting (HTS) 铿乴m with a crack. When an HTS 铿乴m contains a crack, an integral-form boundary condition is also imposed on the crack surface. Since the condition is directly incorporated into the weak form, the numerical solution does not alwayssatisfyFaraday'slawonthecracksurface.Inordertoresolvethisproblem,thefollowingmethodis proposed:a virtualvoltageshouldbeappliedalongthecracksurfacesoastomakeFaraday'slaw numerically satis铿乪d.By means of the proposed method, the permanent magnet method is investigated numerically. The results of computations show that, if the distance between a magnet and a crack is less than a certain limit, the accuracyis degraded remarkably.