Pulse field magnetization (PFM) using a magnetic pulse of Bex = 3.83-5.53 T with various rise times tr (= 6-20ms) has been performed for the cryocooled SmBaCuO bulk superconductor starting at the initial temperature of 40 K. The time evolutions of temperature T(t) and local field BLP (t) have been measured on the bulk surface after applying the magnetic pulse. With increasing tr, the temperature rise ΔT and the trapped field BTP increase for B ex ≤ 4.70 T and decrease for Bex = 5.53 T. The rise time tr required to realize the optimum BTP has been found to become longer for a smaller pulse field Bex. From the analyses of the generated heat Q after five successive applications of pulses (Nos. 1-5) with the same amplitude, the Q(No. 5) value, which can be regarded as the viscous loss Qv, decreases with increasing tr, due mainly to the decrease in the flux propagation velocity v in the bulk with longer tr.
|ジャーナル||Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers|
|出版ステータス||Published - 2005 7月 8|
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