DC and AC Shielding Properties of Bulk High-Tc Superconducting Tubes
- 30 June 2009
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Applied Superconductivity
- Vol. 19 (3), 2905-2908
- https://doi.org/10.1109/tasc.2009.2017880
Abstract
We have studied numerically and experimentally the magnetic flux penetration in high-Tc superconducting tube subjected to a uniform magnetic field parallel to its long axis. This study is carried in view of designing low-frequency magnetic shields by exploiting the diamagnetic properties of high-Tc superconducting ceramics. We have measured the field attenuation for applied magnetic fields in the frequency range 5 mHz-0.1 Hz by Hall probe measurements and at audio frequencies using a sensing coil. A simple 1D analysis using the Kim critical state model was found to be able to reproduce the experimental data satisfactorily. We have also determined the phase shift between the internal and the applied field both experimentally and numerically. Finally, we have studied the sweep rate dependence of the magnetic shielding properties, using data recorded either at several constant sweep rates dB/dt or at several AC fields of various amplitudes and frequencies. Both methods agree with each other and lead to a n -value of the E ~ J n law equal to ~ 40 at 77 K.Keywords
This publication has 17 references indexed in Scilit:
- Critical-current density of melt-grown single-grain Y–Ba–Cu–O disks determined by ac susceptibility measurementsSuperconductor Science and Technology, 2008
- Behavior of bulk high-temperature superconductors of finite thickness subjected to crossed magnetic fields: Experiment and modelPhysical Review B, 2007
- Current-voltage characteristics and flux creep in melt-textured YBa2Cu3O7-deltaSuperconductor Science and Technology, 2000
- Superconductor disks and cylinders in an axial magnetic field. I. Flux penetration and magnetization curvesPhysical Review B, 1998
- Magnetic shieldingPublished by Taylor & Francis Ltd ,1998
- Experimental assessment of the current-limiting mechanisms in BSCCO/Ag high-temperature superconducting tapesSuperconductor Science and Technology, 1997
- The electric field within high-temperature superconductors: mapping the E-J-B surfaceSuperconductor Science and Technology, 1994
- Zero-quantum superconducting magnetic shielding apparatus and methodIEEE Transactions on Magnetics, 1983
- Critical Persistent Currents in Hard SuperconductorsPhysical Review Letters, 1962
- Magnetization of Hard SuperconductorsPhysical Review Letters, 1962