
For FullText PDF, please login, if you are a member of IEICE,
or go to Pay Per View on menu list, if you are a nonmember of IEICE.

Magnetic Shielding Analysis of Axisymmetric HTS Plates in Mixed State
Atsushi KAMITANI Shigetoshi OHSHIMA
Publication
IEICE TRANSACTIONS on Electronics
Vol.E82C
No.5
pp.766773 Publication Date: 1999/05/25
Online ISSN:
DOI:
Print ISSN: 09168516 Type of Manuscript: PAPER Category: Superconductive Electronics Keyword: magnetic shielding, superconductor, YBCO, flux flow, flux creep,
Full Text: PDF(352.8KB)>>
Summary:
The magnetic shielding performance of the highTc superconducting (HTS) plate in a mixed state has been investigated numerically. By taking account of the crystallographic anisotropy of the HTS plate, the axisymmetric shielding plate is assumed to have a multiple thinlayer structure. Under the assumptions, the governing equations of the shielding current density can be expressed in terms of a scalar function. The numerical code to integrate the equation has been developed and, by use of the code, the shielding current density and the damping coefficient are calculated for the axisymmetric HTS plate in a mixed state. The results of computations show that the shielding current density localizes around the edge under the highfrequency magnetic field. With an increasing frequency of the applied magnetic field, the localization becomes remarkable and the shielding current density becomes larger until the flux flow occurs. In addition, the magnetic shielding performance of the HTS plate drastically changes with time under the lowfrequency magnetic field below 100 Hz, whereas it is almost timeindependent under the highfrequency magnetic field. Moreover, it turns out that the HTS plate can shield ac magnetic fields with a high frequency even if it remains in a mixed state.

