Evaluation by numerical analysis of magnetic shielding characteristics of bulk high-Tc superconductor containing weak links

Katsuhiro Fukuoka, Mitsuo Hashimoto, Masaru Tomita, Masato Murakami

Research output: Contribution to journalArticle

Abstract

High-Tc superconductors (HTS), which have the characteristics of critical current density over 3 × 104 A/cm2 at liquid nitrogen temperature (77 K) and 1 T, can be produced. Thus, they are promising for many practical applications such as a magnetic bearing, magnetic levitation, flywheel, and magnetic shielding. Since the HTS characteristics are not homogeneous in some specimens due to grain boundaries and cracks, the distribution of magnetic characteristics should be assessed. Thus, we have measured the distribution of the magnetic flux density on the surface of the HTS using a Hall element, and have evaluated its magnetic characteristics. The measurement of magnetic characteristics using a Hall element is difficult regarding the distribution of the magnetic flux density on the actual surface and inside of the HTS sample. In this research, we conducted a quantitative evaluation of the magnetic shielding characteristics of the HTS including weak links under a static magnetic field with the three-dimensional finite element method analysis.

Original languageEnglish
Pages (from-to)9-17
Number of pages9
JournalElectrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi)
Volume146
Issue number1
DOIs
Publication statusPublished - 2004 Jan 15
Externally publishedYes

Fingerprint

Magnetic shielding
Superconducting materials
Numerical analysis
Magnetic flux
Critical current density (superconductivity)
Magnetic levitation
Magnetic bearings
Flywheels
Liquid nitrogen
Grain boundaries
Magnetic fields
Cracks
Finite element method

Keywords

  • Finite element method
  • Magnetic characteristics
  • Magnetic field analysis
  • Weak link
  • YBCO bulk superconductor

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Evaluation by numerical analysis of magnetic shielding characteristics of bulk high-Tc superconductor containing weak links. / Fukuoka, Katsuhiro; Hashimoto, Mitsuo; Tomita, Masaru; Murakami, Masato.

In: Electrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi), Vol. 146, No. 1, 15.01.2004, p. 9-17.

Research output: Contribution to journalArticle

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AB - High-Tc superconductors (HTS), which have the characteristics of critical current density over 3 × 104 A/cm2 at liquid nitrogen temperature (77 K) and 1 T, can be produced. Thus, they are promising for many practical applications such as a magnetic bearing, magnetic levitation, flywheel, and magnetic shielding. Since the HTS characteristics are not homogeneous in some specimens due to grain boundaries and cracks, the distribution of magnetic characteristics should be assessed. Thus, we have measured the distribution of the magnetic flux density on the surface of the HTS using a Hall element, and have evaluated its magnetic characteristics. The measurement of magnetic characteristics using a Hall element is difficult regarding the distribution of the magnetic flux density on the actual surface and inside of the HTS sample. In this research, we conducted a quantitative evaluation of the magnetic shielding characteristics of the HTS including weak links under a static magnetic field with the three-dimensional finite element method analysis.

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