Magnetic Flux Trapping and Flux Jumps in Pulsed Field Magnetizing Processes in REBCO and Mg-B Bulk Magnets

T. Oka, A. Takeda, H. Oki, K. Yamanaka, L. Dadiel, K. Yokoyama, W. Häßler, J. Scheiter, Naomichi Sakai, Masato Murakami

Research output: Contribution to journalConference article

Abstract

Pulsed-field magnetization technique (PFM) is expected as a cheap and an easy way for HTS bulk materials for utilizing as intense magnets. As the generation of heat due to magnetic flux motion in bulk magnets causes serious degradation of captured fields, it is important to investigate the flux motions during PFM in various field applications. The authors precisely measured the magnetic flux motion in the cryocooled MgB2 bulk magnets containing various amount of Ti. We classified the motions to "no flux flow (NFF)", "fast flux flow (FFF)", and "flux jump (FJ)" regions. The results showed that addition of Ti shifts the field invasion area to high field areas, and expands the NFF regions. The highest field-trapping appears at the upper end of the NFF region. Since the heat generation and its propagation should attribute to the dissipation of magnetic flux, FFF leads to FJ. Compared with MgB2, we referred to GdBCO as for the flux motion. A flux jump was observed at 30 K when the pulse field of 7 T was applied to the preactivated sample, showing its stability against FJ.

Original languageEnglish
Article number012025
JournalJournal of Physics: Conference Series
Volume1590
Issue number1
DOIs
Publication statusPublished - 2020 Jul 31
Event32nd International Symposium on Superconductivity, ISS 2019 - Kyoto, Japan
Duration: 2019 Dec 32019 Dec 5

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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