TITLE

Plasma dynamics in pulsed strong magnetic fields

AUTHOR(S)
Doron, R.; Arad, R.; Tsigutkin, K.; Osin, D.; Weingarten, A.; Starobinets, A.; Bernshtam, V. A.; Stambuichik, E.; Raichenko, Yu. V.; Maront, Y.; Fruchtman, A.; Fisher, A.; Huba, J. D.; Roth, M.
PUB. DATE
May 2004
SOURCE
Physics of Plasmas;May2004, Vol. 11 Issue 5, p2411
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Recent investigations of the interaction of fast-rising magnetic fields with multi-species plasmas at densities of 1013-1015 cm³ are described. The configurations studied are planar or coaxial interelectrode gaps pre-tilled with plasmas, known as plasma opening switches. The diagnostics are based on time-dependent, spatially resolved spectroscopic observations. Three-dimensional spatial resolution is obtained by plasma-doping techniques. The measurements include the propagating magnetic held structure, ion velocity distributions, electric held strengths, and non-Maxwellian electron energy distribution across the magnetic held front. It is found that the magnetic held propagation velocity is faster than expected from diffusion. The magnetic field evolution cannot he explained by the available theoretical treatments based on the Hall field (that could, in principle, explain the fast field propagation). Moreover, detailed observations reveal that magnetic field penetration and plasma reflection occur simultaneously, leading to ion-species separation, which is also not predicted by the available theories. A possible mechanism that is based on the formation of small-scale density fluctuations, previously simulated for astrophysical plasmas, may explain these results.
ACCESSION #
12952639

 

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