Development of a small-size superconducting bulk magnet system especially designed for a pulsed-field magnetization

K. Yokoyama, Tetsuo Oka, K. Noto

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We developed a small superconducting bulk magnet system that was especially designed for a pulsed-field magnetization. The industrial applications of bulk magnets demand the miniaturization of the magnet apparatus as well as the enhancement of the magnetic field. A Gifford-McMahon cycle helium refrigerator with the ultimate temperature of 13 K at the 2nd stage was adopted, and a GdBa2Cu3O7-x bulk material of 60 mm diameter and 20 mm thickness reinforced by a stainless steel ring was located on a cold stage. The total length of the magnetic pole was 570 mm including the refrigerator, therefore, the system could easily be managed. A cooling test and a magnetizing test were carried out using a Hall sensor and thermocouples adhered on the top surface of the material. In the cooling test, the value of 22.5 K at the cold stage was achieved in 3 h. In the magnetizing test, five successive pulsed-fields of the same strength were applied while changing the applied field, and the time responses of the trapped flux density and temperature were measured at each stage. When a magnetic field of 6.97 T was applied, the trapped field reached 2.04 T, which is the highest ever reported for a pulsed-field magnetization of φ{symbol}60 mm class bulk material.

Original languageEnglish
Pages (from-to)1282-1285
Number of pages4
JournalPhysica C: Superconductivity and its Applications
Volume469
Issue number15-20
DOIs
Publication statusPublished - 2009 Oct 15
Externally publishedYes

Fingerprint

Magnets
Magnetization
magnets
Refrigerators
magnetization
refrigerators
Magnetic fields
Cooling
Helium
Stainless Steel
Thermocouples
cooling
magnetic poles
Industrial applications
time response
Poles
miniaturization
Stainless steel
thermocouples
magnetic fields

Keywords

  • Pulsed-field magnetization
  • Superconducting bulk magnet
  • Temperature measurement
  • Trapped flux density

ASJC Scopus subject areas

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

Cite this

Development of a small-size superconducting bulk magnet system especially designed for a pulsed-field magnetization. / Yokoyama, K.; Oka, Tetsuo; Noto, K.

In: Physica C: Superconductivity and its Applications, Vol. 469, No. 15-20, 15.10.2009, p. 1282-1285.

Research output: Contribution to journalArticle

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