Quench and normal zone propagation characteristics of rhqt-processed nb3al wires under cryocooler-cooling conditions

Satoru Murase, M. Shimoyama, Nozomu Nanato, S. B. Kim, G. Nishijima, K. Watanabe, A. Kikuchi, N. Banno, T. Takeuchi

研究成果査読

抄録

The minimum quench energy (MQE) and normal zone propagation velocity (NZPV) of three kinds of Nb3Al superconductors fabricated by the rapid heating, quenching and transformation (RHQT) process were measured under various conditions of applied magnetic field (10-14 T), temperature (7-11 K), and transport current (80-95% of the critical current), while cooled by a cryocooler for developing the over 20-T class cryogen-free magnet. As a result, MQE values were related to the critical current density (Jc); high MQE was obtained for low Jc. It is assumed that Jc has a stronger influence on the MQE than specific heat, thermal conductivity, resistivity, and other parameters of the composite superconductor including the matrix and the stabilizer. NZPV was mainly proportional to the transport current density varying with applied field and temperature. The second contribution to NZPV is assumed to be heat capacity depending on the wire configuration

本文言語English
論文番号5153155
ページ(範囲)2666-2669
ページ数4
ジャーナルIEEE Transactions on Applied Superconductivity
19
3
DOI
出版ステータスPublished - 6月 2009

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • 電子工学および電気工学

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