Evaluation of pulsed-field magnetization of a bulk superconductor with small holes

K. Yokoyama, T. Oka, N. Kondo, S. Hosaka

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Recent upsizing of the diameter and enhancement of performance of bulk superconductors make pulsed field magnetization difficult due to the strong magnetic shield. We propose a bulk material with small holes to supply magnetic flux into the bulk efficiently because superconductivity is intentionally lowered in the portion with holes. On the other hand, we are anxious about the flux flow in a high applied field. To investigate the effect of the proposed method, a bulk material with small holes was manufactured, and a fundamental experiment was carried out. Four holes of 2 mm in diameter were drilled in a growth sector region of a GdBa2Cu3O7-x bulk material of 60 mm in diameter and 20 mm thickness. The holes were filled with solder to improve mechanical strength and heat conduction. The bulk was cooled to 20, 30, 40, and 50 K, and a single pulsed field was applied while changing the amplitude of the applied field at each temperature. It was confirmed that the magnetic flux penetrates at a low applied field as compared with the holeless bulk material, and, moreover, the flux flow was suppressed in a high applied field at a low temperature.

Original languageEnglish
Article number6403884
JournalIEEE Transactions on Applied Superconductivity
Volume23
Issue number3
DOIs
Publication statusPublished - 2013 Feb 11
Externally publishedYes

Keywords

  • Flux flow
  • flux penetration
  • pulsed field magnetization
  • small hole
  • superconducting bulk magnet

ASJC Scopus subject areas

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

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