Computational investigation of the magneto-Rayleigh–Taylor instability in Z-pinch implosions

Zhang Yang; Wu Jiming; Dai Zihuan; Ding Ning; Ning Cheng; Yao Yanzhong; Xiao Delong; Sun Shunkai; Gu Tongxiang; Cao Yi; Huang Jun; Xue Chuang; Shu Xiaojian
April 2010
Physics of Plasmas;Apr2010, Vol. 17 Issue 4, p042702
Academic Journal
The instability evolvement induced by single mode and random density seeds have been investigated by using the Magnetics Atom Radiation Electron Dynamics (MARED) code, which is a two dimensional, three temperature, radiation magnetohydrodynamic Lagrangian code developed for the Z-pinch implosion simulation. The instability development during each stage (linear, weak nonlinear, and nonlinear) and its corresponding characteristics are studied with single-mode seeds. The evolvement of the dominant mode and its final wavelength are revealed through the development of seeds composed of modes covering the “whole” spectrum or just a “band-type” range of it. In addition, the relationship between the initial perturbation amplitude and the final x-ray output are also discussed. Through these discussions, the MARED code is found able to reproduce the primary dynamic characteristics of the Z-pinch implosions and the development of the instability qualitatively agrees with the theoretical analyses and experimental observations, which shows us a modest expectation of the broad coverage of the future application.


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