Influence of High Frequency AC Magnetic Field on Trapped Magnetic Field

Author

Ogawa, Jun ; Fukui, Satoshi ; Oka, Tetsuo ; Yamaguchi, Mitsugi ; Sato, Takao ; Takada, Mamoru ; Sato, Ryuichi ; Tomita, Masaru

Author_Institution

Niigata Univ., Niigata

Volume

17

Issue

2

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

3024

Lastpage

3027

Abstract

The trapped magnetic field in an HTS bulk is decayed and even erased by the application of an AC magnetic field whose amplitude is much smaller than the maximum trapped magnetic field. In previous experiments, the decay of the trapped magnetic field was shown to be due to the temperature rise of the bulk caused by the AC losses. Especially, in a high frequency magnetic field, AC losses are larger and the decay of the trapped magnetic field is accelerated by this AC loss increase. We investigated the time relationships of the AC loss of the HTS bulk in a high frequency magnetic field using the thermal equilibrium equation.

Keywords

flux pinning; high-temperature superconductors; losses; magnetic leakage; AC loss; HTS bulk; high frequency AC magnetic field; high temperature superconductor; thermal equilibrium equation; trapped magnetic field; Coils; Electric variables measurement; Equations; Frequency measurement; High temperature superconductors; Loss measurement; Magnetic field measurement; Magnetic fields; Magnetic levitation; Resistance heating; AC loss; HTS bulk; bulk temperature; thermal equilibrium equation; trapped magnetic field;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2007.899000

Filename

4278232