Article (Scientific journals)
DC and AC Shielding Properties of Bulk High-Tc Superconducting Tubes
Fagnard, Jean-François; Denis, Samuel; Lousberg, Grégory et al.
2009In IEEE Transactions on Applied Superconductivity, 19 (3), p. 2905-2908
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Keywords :
Hall effect; bismuth compounds; calcium compounds; ceramics; diamagnetic materials; high-temperature superconductors; lead compounds; magnetic flux; magnetic shielding; penetration depth (superconductivity); strontium compoundsAC magnetic shielding properties; Bi-2223 cylinder; Bi2-xPbxSr2Ca2Cu3O10; DC magnetic shielding properties; Hall probe measurements; applied magnetic field; bulk high-temperature superconducting tubes; critical state model; diamagnetic properties; frequency 5 mHz to 0.1 Hz; high-temperature superconducting ceramics; magnetic flux penetration; phase shift; sensing coil; temperature 77 K
Abstract :
[en] 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.
Research center :
SUPRATECS - Services Universitaires pour la Recherche et les Applications Technologiques de Matériaux Électro-Céramiques, Composites, Supraconducteurs - ULiège
Disciplines :
Physics
Electrical & electronics engineering
Author, co-author :
Fagnard, Jean-François  ;  Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Capteurs et systèmes de mesures électriques
Denis, Samuel;  Royal Military Academy of Belgium and University of Liege
Lousberg, Grégory ;  Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Electronique et microsystèmes
Dirickx, Michel;  Royal Military Academy of Belgium > CISS
Ausloos, Marcel ;  Université de Liège - ULiège > Département de physique > Physique statistique appliquée et des matériaux - S.U.P.R.A.S.
Vanderheyden, Benoît  ;  Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Electronique et microsystèmes
Vanderbemden, Philippe  ;  Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Capteurs et systèmes de mesures électriques
Language :
English
Title :
DC and AC Shielding Properties of Bulk High-Tc Superconducting Tubes
Publication date :
June 2009
Journal title :
IEEE Transactions on Applied Superconductivity
ISSN :
1051-8223
Publisher :
IEEE, New York, United States - New York
Volume :
19
Issue :
3
Pages :
2905-2908
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
RMA - Royal Military Academy [BE]
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
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