Magnetic flux invasion in REBCO bulk magnets with varying pre-magnetized flux distributions in multiple-PFM processes

Tetsuo Oka, K. Hara, A. Takeda, J. Ogawa, S. Fukui, T. Sato, K. Yokoyama, A. Murakami

Research output: Contribution to journalConference article

Abstract

The motion of magnetic flux invading into the HTS bulk magnets were experimentally studied in their pulsed field magnetization processes. The authors paid attention to the effects of the shapes of the pre-magnetized trapped flux distributions before the successive field applications by means of varying the M-shaped distribution. We estimated the differences of the magnetic flux motions between the Dy123 and Gd123 systems, which might have different Jc properties of each sample. As for the Dy123 system, the increase of remaining flux in the periphery region of the M-shaped distribution resulted in the decrease of flux-trapping according to the promotion of flux invasion. On the other hand, trapped flux density has been raised to 3.4 T owing to the effective suppression of flux invasion for the Gd123 bulk magnet. The experiments showed that the peak heights and the positions of the formerly trapped M-shaped fluxes precisely affect the heat generation and the trapped field performance.

Original languageEnglish
Article number012049
JournalJournal of Physics: Conference Series
Volume871
Issue number1
DOIs
Publication statusPublished - 2017 Jul 26
Externally publishedYes
Event29th International Symposium on Superconductivity, ISS 2016 - Tokyo, Japan
Duration: 2016 Dec 132016 Dec 15

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pulse frequency modulation
magnetic flux
magnets
heat generation
promotion
flux density
trapping
retarding
magnetization

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Magnetic flux invasion in REBCO bulk magnets with varying pre-magnetized flux distributions in multiple-PFM processes. / Oka, Tetsuo; Hara, K.; Takeda, A.; Ogawa, J.; Fukui, S.; Sato, T.; Yokoyama, K.; Murakami, A.

In: Journal of Physics: Conference Series, Vol. 871, No. 1, 012049, 26.07.2017.

Research output: Contribution to journalConference article

Oka, Tetsuo ; Hara, K. ; Takeda, A. ; Ogawa, J. ; Fukui, S. ; Sato, T. ; Yokoyama, K. ; Murakami, A. / Magnetic flux invasion in REBCO bulk magnets with varying pre-magnetized flux distributions in multiple-PFM processes. In: Journal of Physics: Conference Series. 2017 ; Vol. 871, No. 1.
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