Spectral analysis of magnetic fields generated by shielding current density in a high-temperature superconductor

Author

Kamitani, Atsushi ; Hasegawa, Kyoko ; Yokono, Takafumi

Author_Institution

Dept. of Informatics, Yamagata Univ., Japan

Volume

39

Issue

3

fYear

2003

fDate

5/1/2003 12:00:00 AM

Firstpage

1511

Lastpage

1514

Abstract

The magnetic fields generated by the shielding current density are numerically investigated by use of spectral analysis. Coupled with the J-E constitutive relation, the governing equation of the shielding current density is numerically solved to obtain the time sequence of the magnetic fields. By means of the fast Fourier transform (FFT), the spectral analysis of the time sequence is performed. The results of the analysis show that the flux flow over the whole volume of the superconductor can be detected from the onset of the third harmonics of the magnetic fields.

Keywords

Newton method; current density; fast Fourier transforms; flux flow; harmonics; high-temperature superconductors; initial value problems; magnetic fields; magnetic flux; shielding; spectral analysis; FEM; FFT; HTS; J-E constitutive relation; Newton method; fast Fourier transform; high-temperature superconductors; magnetic fields; magnetic flux flow; nonlinear initial-value problem; shielding current density; spectral analysis; time sequence; Couplings; Current density; Equations; Fast Fourier transforms; Harmonic analysis; High temperature superconductors; Magnetic analysis; Magnetic fields; Magnetic shielding; Spectral analysis;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2003.810215

Filename

1198512