Rise-time elongation effects on trapped field and temperature rise in pulse field magnetization for high temperature superconducting bulk

Hiroyuki Fujishiro, Masahiko Kaneyama, Kazuya Yokoyama, Tetsuo Oka, Koshichi Noto

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Pulse field magnetization (PFM) using a magnetic pulse of Bex = 3.83-5.53 T with various rise times tr (= 6-20ms) has been performed for the cryocooled SmBaCuO bulk superconductor starting at the initial temperature of 40 K. The time evolutions of temperature T(t) and local field BLP (t) have been measured on the bulk surface after applying the magnetic pulse. With increasing tr, the temperature rise ΔT and the trapped field BTP increase for B ex ≤ 4.70 T and decrease for Bex = 5.53 T. The rise time tr required to realize the optimum BTP has been found to become longer for a smaller pulse field Bex. From the analyses of the generated heat Q after five successive applications of pulses (Nos. 1-5) with the same amplitude, the Q(No. 5) value, which can be regarded as the viscous loss Qv, decreases with increasing tr, due mainly to the decrease in the flux propagation velocity v in the bulk with longer tr.

Original languageEnglish
Pages (from-to)4919-4925
Number of pages7
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume44
Issue number7 A
DOIs
Publication statusPublished - 2005 Jul 8

Keywords

  • Bulk superconductor
  • Heat generation
  • Pinning loss
  • Pulse field magnetization
  • Rise time
  • Temperature measurement
  • Viscous loss

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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