Threshold for thermal ionization of an aluminum surface by pulsed megagauss magnetic field
T J Awe1, B S Bauer, S Fuelling
1University of Nevada, Reno, 5625 Fox Avenue, Reno, Nevada 89506, USA. awetom@gmail.com
Abstract:
The first measurement of the threshold for thermal ionization of the surface of thick metal by pulsed magnetic field (B) is reported. Thick aluminum-with depth greater than the magnetic skin layer-was pulsed with partial differential B/ partial differential t from 30-80 MG/micros. Novel loads avoided nonthermal plasma (from electron avalanche, or energetic particles or photons from arcs). Thermal plasma forms from 6061-alloy aluminum when the surface magnetic field reaches 2.2 MG, in qualitative agreement with numerical simulation results by Garanin et al. [J. Appl. Mech. Tech. Phys. 46, 153 (2005)].
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