Title :
A solution to the radiative collapse problem in Z-pinch simulations
Author :
Clark, R.W. ; Giuliani, J.L. ; Velikovich, A.L. ; Davis, J. ; Rudakov, L.I.
Author_Institution :
Div. of Plasma Phys., Naval Res. Lab., Washington, DC, USA
Abstract :
Summary form only given. In a recent paper, Velikovich, et al., proposed a model for enhanced energy coupling in a Z-pinch via the incorporation of exterior magnetic field through the Rayleigh-Taylor unstable plasma-vacuum interface. This theory models the pinch plasma as a foam-like medium saturated with toroidal "magnetic bubbles" which convert field energy to plasma thermal energy once the pinch and entrained bubbles converge to the pinch axis. The present work combines the model equations with a 1-D (radially resolved) radiation magneto-hydrodynamic (MHD) code for the pinch implosion. The pinch plasma is treated as a two fluid medium with a volume fraction Cu comprised of magnetic voids and the remaining fraction of plasma gas. The interface formation rate of bubbles is a parameter of the simulation. The bubbles move through the gas according to a drag equation. Energy is transferred to the ions through drag heating because of the difference in velocity and electrons through pdV work. Separate induction equations for the magnetic field in the plasma gas and in the bubbles are included.
Keywords :
Z pinch; plasma magnetohydrodynamics; plasma simulation; 1D radially resolved radiation magnetohydrodynamic code; Rayleigh-Taylor unstable plasma-vacuum interface; Z-pinch simulations; drag equation; drag heating; energy coupling; entrained bubbles; exterior magnetic field; field energy; foam-like medium saturated; magnetic field; magnetic voids; model; model equations; pinch plasma; plasma gas; plasma thermal energy; radiative collapse problem; toroidal magnetic bubbles; volume fraction; Couplings; Energy resolution; Equations; Heat transfer; Magnetic liquids; Magnetic separation; Magnetohydrodynamics; Plasma simulation; Saturation magnetization; Toroidal magnetic fields;
Conference_Titel :
Plasma Science, 2000. ICOPS 2000. IEEE Conference Record - Abstracts. The 27th IEEE International Conference on
Conference_Location :
New Orleans, LA, USA
Print_ISBN :
0-7803-5982-8
DOI :
10.1109/PLASMA.2000.854788