Gregory P Lousberg et al 2009 Supercond. Sci. Technol. 22 125026 doi:10.1088/0953-2048/22/12/125026
Gregory P Lousberg1,2, J-F Fagnard1, E Haanappel3,4, X Chaud5, M Ausloos6, B Vanderheyden1 and Ph Vanderbemden1
Show affiliationsWe present a method for characterizing the propagation of the magnetic flux in an artificially drilled bulk high-temperature superconductor (HTS) during pulsed-field magnetization. As the magnetic pulse penetrates the cylindrical sample, the magnetic flux density is measured simultaneously in 16 holes by means of microcoils that are placed across the median plane, i.e. at an equal distance from the top and bottom surfaces, and close to the surface of the sample. We discuss the time evolution of the magnetic flux density in the holes during a pulse and measure the time taken by the external magnetic flux to reach each hole. Our data show that the flux front moves faster in the median plane than on the surface when penetrating the sample edge; it then proceeds faster along the surface than in the bulk as it penetrates the sample further. Once the pulse is over, the trapped flux density inside the central hole is found to be about twice as large in the median plane as on the surface. This ratio is confirmed by modelling.
Issue 12 (December 2009)
Received 13 August 2009, in final form 21 September 2009
Published 23 October 2009
Gregory P Lousberg et al 2009 Supercond. Sci. Technol. 22 125026
Anthony J McCaffery and Richard J Marsh 2001 J. Phys. B: At. Mol. Opt. Phys. 34 R131
E Orlandini et al 2005 J. Phys. A: Math. Gen. 38 3473
S Chand and J Kumar 1995 Semicond. Sci. Technol. 10 1680
J Singh 1980 J. Phys. C: Solid State Phys. 13 3639
Zhu Bo et al 2009 Chinese Phys. Lett. 26 114102
Ruth Gregory et al 2000 Class. Quantum Grav. 17 4437
Marco Coïsson et al 2004 J. Phys.: Condens. Matter 16 6279
Andreas Staudt and Christoph H Keitel 2003 J. Phys. B: At. Mol. Opt. Phys. 36 L203
F Schiller et al 2008 New J. Phys. 10 113017