Bent Marshak Waves

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Radiation driven heat waves (Marshak Waves) are ubiquitous in astrophysics and terrestrial laser driven high energy density plasma physics (HEDP) experiments. Generally, the equations describing Marshak waves are so nonlinear, that solutions involving more than one spatial dimension require simulation. However, in this paper we show how one may analytically solve the problem of the two-dimensional nonlinear evolution of a Marshak wave, bounded by lossy walls, using an asymptotic expansion in a parameter related to the wall albedo and a simplification of the heat front equation of motion. Three parameters determine the nonlinear evolution, a modified Markshak diffusion constant, a ... continued below

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Hurricane, O A & Hammer, J H October 11, 2005.

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Description

Radiation driven heat waves (Marshak Waves) are ubiquitous in astrophysics and terrestrial laser driven high energy density plasma physics (HEDP) experiments. Generally, the equations describing Marshak waves are so nonlinear, that solutions involving more than one spatial dimension require simulation. However, in this paper we show how one may analytically solve the problem of the two-dimensional nonlinear evolution of a Marshak wave, bounded by lossy walls, using an asymptotic expansion in a parameter related to the wall albedo and a simplification of the heat front equation of motion. Three parameters determine the nonlinear evolution, a modified Markshak diffusion constant, a smallness parameter related to the wall albedo, and the spacing of the walls. The final nonlinear solution shows that the Marshak wave will be both slowed and bent by the non-ideal boundary. In the limit of a perfect boundary, the solution recovers the original diffusion-like solution of Marshak. The analytic solution will be compared to a limited set of simulation results and experimental data.

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PDF-file: 21 pages; size: 0 Kbytes

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  • Presented at: American Physical Society/ Division of Plasma Physics, Denver, CO, United States, Oct 24 - Oct 28, 2005

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  • Report No.: UCRL-CONF-216103
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 885356
  • Archival Resource Key: ark:/67531/metadc875630

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  • October 11, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Nov. 22, 2016, 9:19 p.m.

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Hurricane, O A & Hammer, J H. Bent Marshak Waves, article, October 11, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc875630/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.