Models of electron conductivity which lead to ablation stabilization of fluid instabilities in laser-driven implosions

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LASNEX calculations with a modified electron conductivity show the existence of a firepolishing stabilization effect. By modifying the thermal conductivity so that K $alpha$ T/sup n//rho/sup m/, one is able to construct a situation in which the electrons deposit their energy in a thin layer at the ablation surface and closely match the zero order solutions assumed earlier. The firepolishing effect appears to require that a significant fraction of the total pressure be due to the ablation process itself rather than the thermal pressure in the corona gas. It also requires KL approximately 1 where L is the scale height ... continued below

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Pages: 22

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Lindl, J.D. & Mead, W.C. October 17, 1975.

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LASNEX calculations with a modified electron conductivity show the existence of a firepolishing stabilization effect. By modifying the thermal conductivity so that K $alpha$ T/sup n//rho/sup m/, one is able to construct a situation in which the electrons deposit their energy in a thin layer at the ablation surface and closely match the zero order solutions assumed earlier. The firepolishing effect appears to require that a significant fraction of the total pressure be due to the ablation process itself rather than the thermal pressure in the corona gas. It also requires KL approximately 1 where L is the scale height for decay of thermal perturbations generated at the ablation surface. For classical electron conductivity, because the thermal flux depends linearly on the grams/cm$sup 2$ necessary to stop the electrons, (1/rho) nabla rho approximately (1/T) nabla T near the ablation surface so that the pressure is nearly constant across the ablation surface. Hence there is no ablation pressure as such and no firepolishing effect for electron-driven implosions. (auth)

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Pages: 22

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Dep. NTIS

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  • APS meeting, St. Petersburg, Florida, USA, 10 Nov 1975

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  • Report No.: UCRL--77041
  • Report No.: CONF-751130--8
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 4118947
  • Archival Resource Key: ark:/67531/metadc872905

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  • October 17, 1975

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  • Sept. 16, 2016, 12:32 a.m.

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  • Oct. 18, 2016, 1:44 p.m.

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Lindl, J.D. & Mead, W.C. Models of electron conductivity which lead to ablation stabilization of fluid instabilities in laser-driven implosions, article, October 17, 1975; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc872905/: accessed August 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.