Enhancement of Trapped Magnetic Field Using a Large-Size REBCO Bulk in a Desktop Type Superconducting Bulk Magnet

Kazuya Yokoyama, Atsushi Katsuki, Atsuro Miura, Tetsuo Oka

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We have developed a desktop type superconducting bulk magnet using a Stirling cryocooler with the aim of miniaturizing the magnet system. In our previous study, the lowest achieved temperature of 51.3 K and the maximum trapped field of approximately 2.8 T were achieved by cooling and magnetizing tests using a GdBCO bulk material 45 mm in diameter. For this paper, we remodeled the bulk magnet system in order to attach a large bulk 60 mm in diameter for the purpose of enhancing the total magnetic flux. This was based on the idea that the total magnetic flux was increased if the volume of the bulk was expanded, while we were concerned about the reduction of the trapped field due to the low cooling capacity of the refrigerator and the high ultimate temperature. When cooling and magnetizing tests were carried out using φ60-mm GdBCO bulk, the sample was cooled from room temperature to an ultimate temperature of 55.6 K for approximately 6.5 h, and the total magnetic flux was 2.0 mWb, which was approximately twice that of φ45-mm bulk, indicating that the aim of this study was achieved. The maximum trapped field was 3.0 T, which was the maximum value in pulsed-field magnetization using a large bulk at temperatures beyond 50 K.

Original languageEnglish
Article number8187669
JournalIEEE Transactions on Applied Superconductivity
Volume28
Issue number3
DOIs
Publication statusPublished - 2018 Apr 1
Externally publishedYes

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trapped magnetic fields
Magnets
magnetic flux
magnets
Magnetic fields
cooling
Magnetic flux
augmentation
Cooling
refrigerators
Temperature
Refrigerators
magnetization
temperature
room temperature
Magnetization

Keywords

  • pulsed field magnetization
  • REBCO bulk superconductor
  • Stirling refrigerator
  • total magnetic flux

ASJC Scopus subject areas

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

Cite this

Enhancement of Trapped Magnetic Field Using a Large-Size REBCO Bulk in a Desktop Type Superconducting Bulk Magnet. / Yokoyama, Kazuya; Katsuki, Atsushi; Miura, Atsuro; Oka, Tetsuo.

In: IEEE Transactions on Applied Superconductivity, Vol. 28, No. 3, 8187669, 01.04.2018.

Research output: Contribution to journalArticle

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