Enhancement of Trapped Field and Total Trapped Flux on High Temperature Bulk Superconductor by a New Pulse-Field Magnetization Method

概要

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A higher trapped field $B_{\text{T}}{}^{\text{P}}$ and larger total trapped flux $\Phi_{\text{T}}$ have been achieved on a SmBaCuO bulk superconductor ($\phi$ 45 mm) by a modified multipulse technique with stepwise cooling (MMPSC) and a subsequent iterative magnetizing operation with gradually reduced pulse field amplitude (IMRA). $B_{\text{T}}{}^{\text{P}}=4.33$ T has been realized at the center of the bulk surface by the MMPSC method, which is higher than that attained by a single-pulse application ($B_{\text{T}}{}^{\text{P}}=3.3$ T). After the IMRA process, $\Phi_{\text{T}}$ (5 mm) = 1.55 mWb was achieved 5 mm above the bulk surface, which is about 35% larger than that after the MMPSC process. The MMPSC method combined with the IMRA process (MMPSC-IMRA) is demonstrated to be a universal and promising pulse-field magnetization technique for enhancing both $B_{\text{T}}{}^{\text{P}}$ and $\Phi_{\text{T}}$ on any superconducting bulks.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2007-07-15