Evaluation of pulsed-field magnetization on a superconducting bulk magnet system using a 13 K refrigerator

K. Yokoyama, T. Oka, K. Noto

研究成果: Article

5 引用 (Scopus)

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We developed a small-size superconducting bulk magnet system using a 13 K refrigerator. The industrial applications of bulk magnets demand the miniaturization of the magnet apparatus as well as the enhancement of the magnetic field. Downsizing of the apparatus can be achieved by restricting the magnetizing method to pulsed-field magnetization (PFM). PFM of a high-performance bulk, on the other hand, presents a difficult problem, i.e., large heat generation after the application of pulsed fields suppresses a trapped field. Therefore, a Gifford-McMahon cycle helium refrigerator with low ultimate temperature and large cooling capacity was adopted with the expectation to increase the Jc and quickly remove the heat. In a previous magnetizing test using a GdBa2Cu307-x bulk material, a trapped field of 2.76 T was achieved. In this paper, we evaluate a trapped field when applying a magnetic field of constant amplitude with varying temperature, and we used a multi-pulse technique with a stepwise cooling (MPSC) method in which several pulsed fields were applied as a function of the amplitude and temperature to improve the trapped field. We successfully trapped a magnetic field of 3.02 T.

元の言語English
記事番号5624613
ページ(範囲)1657-1660
ページ数4
ジャーナルIEEE Transactions on Applied Superconductivity
21
発行部数3 PART 2
DOI
出版物ステータスPublished - 2011 6 1
外部発表Yes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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