Numerical Simulation of Trapped Field and Temperature Rise in MgB2 Bulks Magnetized by Pulsed Field

作者：Fujishiro Hiroyuki^*; Naito Tomoyuki; Oyama Mitsuru; Arayashiki Takahiro; Tamura Takuya; Sasaki Tomohisa; Giunchi Giovanni

来源：IEEE Transactions on Applied Superconductivity, 2013, 23(3): 6800804.

DOI：10.1109/TASC.2012.2237224

• MgB2 bulk
• numerical simulation
• pulsed-field magnetization
• trapped field

Pulsed field magnetization (PFM) was performed for the MgB2 bulk 30 mm in diameter and the applied pulsed-field dependence of the trapped field B-T(C) , temperature rise Delta T and time dependence of the local field B-L(C)(t) were measured on the bulk. B-T(C) = 0.71 T was achieved at 14 K after applying the pulsed field of B-ex = 1.55 T, where Delta T of about 10 K was observed. Numerical simulation of PFM was also performed and B-T(C), Delta T and B-L(C)(t) were simulated. The results of the simulation reproduced the experimental ones qualitatively. The flux dynamics and the heat generation in the MgB2 bulk during PFM were in clear contrast with those in REBaCuO bulks because of a small specific heat, large thermal conductivity, and narrow temperature margin against the transition temperature T-c.

• 出版日期2013-6