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)


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
Issue number3
Publication statusPublished - 2019 Apr


  • 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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