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Flux jumps in high-J <inf>c</inf> MgB<inf>2</inf> bulks during pulsed field magnetization

Fujishiro, H and Mochizuki, H and Naito, T and Ainslie, MD and Giunchi, G (2016) Flux jumps in high-J <inf>c</inf> MgB<inf>2</inf> bulks during pulsed field magnetization. Superconductor Science and Technology, 29. ISSN 0953-2048

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© 2016 IOP Publishing Ltd. Pulsed field magnetization (PFM) of a high-J c MgB 2 bulk disk has been investigated at 20 K, in which flux jumps frequently occur for high pulsed fields. Using a numerical simulation of the PFM procedure, we estimated the time dependence of the local magnetic field and temperature during PFM. We analyzed the electromagnetic and thermal instability of the high-J c MgB 2 bulk to avoid flux jumps using the time dependence of the critical thickness, d c (t), which shows the upper safety thickness to stabilize the superconductor magnetically, and the minimum propagation zone length, l m (t), to obtain dynamical stability. The values of d c (t) and l m (t) change along the thermally-stabilized direction with increasing temperature below the critical temperature, T c . However, the flux jump can be qualitatively understood by the local temperature, T(t), which exceeds T c in the bulk. Finally, possible solutions to avoid flux jumps in high-J c MgB 2 bulks are discussed.

Item Type: Article
Divisions: Div C > Materials Engineering
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 18:58
Last Modified: 15 Aug 2017 01:26