高温超電導体磁気シールドの漏洩磁場

概要

論文の詳細を見る
Superconducting shield which has wall thickness over London penetration depth can realize zero field environment in principle. But in policrystal superconductor, to contact with Josephson junction between crystals, critical current density is smaller, equivalent penatration depth is longer. Consequently it is possible that external magnetic field penetrate through a superconductive wall and deteriorate shielding property. We applied equivalent penetration depth to magnetic field determination method of superconductor and performed measurement of leakage field in BiSrCaCuO(2212 phase) superconducting hollow cylinders. As the result of that, leakage field was observed and the shielding effect is similar to analysis. In spite of that, we show that superconductor has good shielding property superior to ferromagnetic and can improve the limited shielding property by coupling to ferromagnetic.
社団法人電気学会の論文
2005-05-01