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 journal › Article

Abstract

We study a high magnetic field generation using HTS bulk magnets activated by pulsed-field magnetization (PFM) with the goal of their industrial application. In our previous study, a single-stage GM-type refrigerator and a dual-stage GM-type refrigerator with 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 dual-stage GM-type refrigerator with a high cooling capacity of 12 W at 20 K aiming to enhance a trapped field by improving a 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 hours. 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
JournalIEEE Transactions on Applied Superconductivity
DOIs
Publication statusAccepted/In press - 2018 Aug 13

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Refrigerators
refrigerators
Magnets
magnets
Cooling
cooling
evaluation
Magnetic flux
compressors
Temperature
Industrial applications
magnetic flux
Compressors
Poles
Magnetization
poles
flux density
Magnetic fields
Fluxes
magnetization

Keywords

  • Cooling
  • cooling capacity
  • HTS bulk magnet
  • magnetic field distribution
  • Magnetic flux
  • Magnetic separation
  • pulsed-field magnetization
  • refrigerator
  • Refrigerators
  • Superconducting magnets
  • Temperature measurement

ASJC Scopus subject areas

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

Cite this

Magnetizing performance evaluation of HTS bulk magnet using a 12 K refrigerator with high cooling capacity. / Yokoyama, Kazuya; Katsuki, Atsushi; Miura, Atsuro; Oka, Tetsuo.

In: IEEE Transactions on Applied Superconductivity, 13.08.2018.

Research output: Contribution to journal › Article

Yokoyama, K, Katsuki, A, Miura, A & Oka, T 2018, 'Magnetizing performance evaluation of HTS bulk magnet using a 12 K refrigerator with high cooling capacity', IEEE Transactions on Applied Superconductivity. https://doi.org/10.1109/TASC.2018.2865461
Yokoyama K, Katsuki A, Miura A, Oka T. Magnetizing performance evaluation of HTS bulk magnet using a 12 K refrigerator with high cooling capacity. IEEE Transactions on Applied Superconductivity. 2018 Aug 13. https://doi.org/10.1109/TASC.2018.2865461
Yokoyama, Kazuya ; Katsuki, Atsushi ; Miura, Atsuro ; Oka, Tetsuo. / Magnetizing performance evaluation of HTS bulk magnet using a 12 K refrigerator with high cooling capacity. In: IEEE Transactions on Applied Superconductivity. 2018.
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