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 journalArticle

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

Fingerprint

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 journalArticle

@article{da940c46721d4e8db6e0ac883ca8097e,
title = "Magnetizing performance evaluation of HTS bulk magnet using a 12 K refrigerator with high cooling capacity",
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.",
keywords = "Cooling, cooling capacity, HTS bulk magnet, magnetic field distribution, Magnetic flux, Magnetic separation, pulsed-field magnetization, refrigerator, Refrigerators, Superconducting magnets, Temperature measurement",
author = "Kazuya Yokoyama and Atsushi Katsuki and Atsuro Miura and Tetsuo Oka",
year = "2018",
month = "8",
day = "13",
doi = "10.1109/TASC.2018.2865461",
language = "English",
journal = "IEEE Transactions on Applied Superconductivity",
issn = "1051-8223",
publisher = "Institute of Electrical and Electronics Engineers Inc.",

}

TY - JOUR

T1 - Magnetizing performance evaluation of HTS bulk magnet using a 12 K refrigerator with high cooling capacity

AU - Yokoyama, Kazuya

AU - Katsuki, Atsushi

AU - Miura, Atsuro

AU - Oka, Tetsuo

PY - 2018/8/13

Y1 - 2018/8/13

N2 - 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.

AB - 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.

KW - Cooling

KW - cooling capacity

KW - HTS bulk magnet

KW - magnetic field distribution

KW - Magnetic flux

KW - Magnetic separation

KW - pulsed-field magnetization

KW - refrigerator

KW - Refrigerators

KW - Superconducting magnets

KW - Temperature measurement

UR - http://www.scopus.com/inward/record.url?scp=85051657485&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85051657485&partnerID=8YFLogxK

U2 - 10.1109/TASC.2018.2865461

DO - 10.1109/TASC.2018.2865461

M3 - Article

AN - SCOPUS:85051657485

JO - IEEE Transactions on Applied Superconductivity

JF - IEEE Transactions on Applied Superconductivity

SN - 1051-8223

ER -