Ultra-high-density plasma experiments: MHD simulations Page: 3 of 6
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ULTRA-HI GH.-,EN I TY PLASMA EXPERIMENTS: MHD SI MUILAT IONS
J. H. Brownell, 1. R. Lindemuth. T. A. Oliphant. D. L. Weiss
Thermonuclear Applications Group
Applied Theoretical Physics Division
Los Alamos National Laboratory
Los Alamos, NM 85845 U.S.A.
High density, laser-initiated, gas-embedded Z-pinch
experiments which are being performed at Los Alamos are being
treated computationally using a two-dimensional
magnetohydrodynamic computer code. All aspects of the
experiment are modeled including the laser-optics system, the
Marx-bank/transmission line, electron avalanching, and the
experimental diagnostics. Experimental observations have
beon reproduced very well. The plasma produced in the
experiments has n,'10Z0/cm3, T-200eV, and n0 ).2xi013 s/cm3.
Advances in pulsed power technology have made it possible to
build a new type of plasma device, a laser-initiated, gas-embedded
Z-pinch in which the plasma Is primarily ohmically heatedly. A device
characterized by an energy of 70kJ and a peak charge voltage of 600kV
has produced a plasma with n,>2x1020/cm3, Tm200eV and n,,>2x10l3
s/cm3; two-dimensional magnetohydrodynamic(MHD) computer calculation:
have reproduced the experimental observations to a very satisfactory
degree. In this paper we descrit-e our computational model, computed
results, and predictions.
Our computations model all aspects of the experiment. A voltage
is applied across the electrode Sep, an initiating laser :s discharged
along the axis, and current flows between the electrodes to create a
hot, dense plasma column. In the computations a laser-optics package
computes the temporal and spatial evolution of the laser profile in
the discharee chamber. A Mara-bank/transmission-line package computes
the temporal evolution of the self-consistent voltehe across the
discharge chamber. An electron avalanche model uses a non-linear
Ohm's law to compute the spatially and temporally dependent electric
field and the resulting non-uniform increase in electron elensity.
When current flows, two-dimensional MHD calculations determine thq
spatial and temporal evolution of the plasma density, plasma
temperature, plasmi velocity, and magnetic field profiles. The MHD
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Brownell, J.H.; Lindemuth, I.R.; Oliphant, T.A. & Weiss, D.L. Ultra-high-density plasma experiments: MHD simulations, article, August 1, 1981; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1107312/m1/3/: accessed September 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.