Title :
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
fDate :
6/1/2007 12:00:00 AM
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;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2007.899000
