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Ram pressure scaling and non-uniformity characterization of a spherically imploding liner formed by hypervelocity plasma jets

Author: Jason T. Cassibry
Requested Type: Poster Only
Submitted: 2014-05-30 16:12:02

Co-authors: J. Dougherty, S. Thompson, S.C. Hsu, and F. D. Witherspoon

Contact Info:
University of AL in Huntsville
TH S232
Huntsville, AL   35899

Abstract Text:
Three dimensional modeling of plasma liner formation and implosion is performed using the Smoothed Particle Hydrodynamics Code (SPHC) with radiation, thermal transport, and tabular equations of state, accounting for ionization, in support of the plasma liner formation experiment. The plasma liner experiment is an outgrowth of plasma jet driven magneto-inertial fusion[1] and a follow on to the plasma liner experiment[2,3]. Previous SPHC modeling showed that ideal (i.e. calorically perfect, adiabatic gas) scaling of peak stagnation pressure increased linearly with density and number of jets, quadratically with jet radius and initial velocity, and inversely with the initial jet length or square of the wall radius.[4] Similar studies showed the tendancy of the plasma jets-formed liner to smear pressure gradients, evolving towards the spherically symmetric liner equivalent during implosion.[5] More recently, modeling with a tabular eos, thermal transport, and radiation have shown that peak stagnation pressure is sensitive to the initial jet distribution.[6] A series of simulations are conducted to study the effects of initial jet conditions on peak ram pressure and liner non-uniformity during plasma liner implosion. The growth rate of large amplitude density perturbations introduced by the discrete jets are computed and compared with predictions by the Bell-Plesset equation.

Characterization: 1.1,4.0

Please group with companion talks by Hsu and Witherspoon in the
1) Hsu
2) Witherspoon
3) Cassibry

Workshop on Exploratory Topics in Plasma and Fusion Research (EPR) and US-Japan Compact Torus (CT) Workshop
August 5-8, 2014
Madison, Wisconsin

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