Magnetizing Performance Evaluation of HTS Bulk Magnet Using a 12 K Refrigerator with High Cooling Capacity

Kazuya Yokoyama, Atsushi Katsuki, Atsuro Miura, Tetsuo Oka

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We study a high magnetic field generation using HTS bulk magnets activated by pulsed-field magnetization with the goal of their industrial application. In our previous study, a single-stage GM-type refrigerator and a two-stage GM-type refrigerator with an air-cooled-type compressor and a Stirling refrigerator were used for cooling an HTS bulk aiming at simplifying the bulk magnet system. Now, we developed a new bulk magnet system using a two-stage GM-type refrigerator with a high cooling capacity of 12 W at 20 K aiming to enhance a trapped field by improving the cooling ability. When a GdBCO bulk 60 mm in diameter and 20 mm thick was cooled from the room temperature to the lowest, the lowest temperature was 13.3 K at the sample stage and 45.5 K at the bulk surface for 3.5 h. When a single pulsed field was applied with varying the amplitude and temperature, the maximum flux densities of 3.59 T on the bulk surface and 2.34 T at the pole surface, and the total magnetic flux of 2.48 mWb were achieved at 20 K.

Original languageEnglish
Article number8435968
JournalIEEE Transactions on Applied Superconductivity
Volume29
Issue number3
DOIs
Publication statusPublished - 2019 Apr

Keywords

  • Cooling capacity
  • HTS bulk magnet
  • magnetic field distribution
  • pulsed-field magnetization (PFM)
  • refrigerator

ASJC Scopus subject areas

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

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