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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-JcMgB2bulk 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-JcMgB2bulk to avoid flux jumps using the time dependence of the critical thickness, dc(t), which shows the upper safety thickness to stabilize the superconductor magnetically, and the minimum propagation zone length, lm(t), to obtain dynamical stability. The values of dc(t) and lm(t) change along the thermally-stabilized direction with increasing temperature below the critical temperature, Tc. However, the flux jump can be qualitatively understood by the local temperature, T(t), which exceeds Tcin the bulk. Finally, possible solutions to avoid flux jumps in high-JcMgB2bulks are discussed.

Item Type: Article
Divisions: Div C > Materials Engineering
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 18:58
Last Modified: 19 Jul 2018 07:06