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Title: Electron heat conduction under non-Maxwellian distribution in hohlraum simulation

Abstract

An electron transport model based on the non-Maxwellian distribution f{sub 0}{proportional_to}e{sup -{nu}{sup m}} (NM model), caused by the inverse bremsstrahlung heating, is used in 1-D plane target and 2-D hohlraum simulations. In the NM model, the electron heat flux depends not only on the gradient of electron temperature T{sub e} but also on the gradients of electron number density and the index m. From 1-D simulations, the spatial distribution of T{sub e} is dune-like and T{sub e} decreases obviously in the flux-heated region, which is very different from the flat profile obtained by using the flux limit model (FL model) but similar to the experimental observations [Gregori et al., Phys. Rev. Lett. 92, 205006 (2004)] and the nonlocal results [Rosen et al., High Energy Density Phys. 7, 180 (2011)]. The reason which causes the dune-like profile of T{sub e} is discussed in the paper. From 2-D hohlraum simulations, the NM results of the plasma status, the emission peak and profile inside hohlraum are very different from the FL model results. Finally, it is hard to use an average flux limiter in the FL model to obtain the same hohlraum plasma status and emission with those under the NM model.

Authors:
; ; ; ;  [1]
  1. Institute of Applied Physics and Computational Mathematics, Beijing 100088 (China)
Publication Date:
OSTI Identifier:
22043574
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 19; Journal Issue: 1; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BREMSSTRAHLUNG; DENSITY; ELECTRON TEMPERATURE; ELECTRONS; EMISSION; ENERGY DENSITY; HEAT FLUX; ION TEMPERATURE; PEAKS; PLASMA DENSITY; PLASMA HEATING; PLASMA SIMULATION; SPATIAL DISTRIBUTION; THERMAL CONDUCTION

Citation Formats

Yihuo, Wen, Lan, Ke, Jungu, Pei, Yong, Heng, and Hongzeng, Qing. Electron heat conduction under non-Maxwellian distribution in hohlraum simulation. United States: N. p., 2012. Web. doi:10.1063/1.3677357.
Yihuo, Wen, Lan, Ke, Jungu, Pei, Yong, Heng, & Hongzeng, Qing. Electron heat conduction under non-Maxwellian distribution in hohlraum simulation. United States. doi:10.1063/1.3677357.
Yihuo, Wen, Lan, Ke, Jungu, Pei, Yong, Heng, and Hongzeng, Qing. Sun . "Electron heat conduction under non-Maxwellian distribution in hohlraum simulation". United States. doi:10.1063/1.3677357.
@article{osti_22043574,
title = {Electron heat conduction under non-Maxwellian distribution in hohlraum simulation},
author = {Yihuo, Wen and Lan, Ke and Jungu, Pei and Yong, Heng and Hongzeng, Qing},
abstractNote = {An electron transport model based on the non-Maxwellian distribution f{sub 0}{proportional_to}e{sup -{nu}{sup m}} (NM model), caused by the inverse bremsstrahlung heating, is used in 1-D plane target and 2-D hohlraum simulations. In the NM model, the electron heat flux depends not only on the gradient of electron temperature T{sub e} but also on the gradients of electron number density and the index m. From 1-D simulations, the spatial distribution of T{sub e} is dune-like and T{sub e} decreases obviously in the flux-heated region, which is very different from the flat profile obtained by using the flux limit model (FL model) but similar to the experimental observations [Gregori et al., Phys. Rev. Lett. 92, 205006 (2004)] and the nonlocal results [Rosen et al., High Energy Density Phys. 7, 180 (2011)]. The reason which causes the dune-like profile of T{sub e} is discussed in the paper. From 2-D hohlraum simulations, the NM results of the plasma status, the emission peak and profile inside hohlraum are very different from the FL model results. Finally, it is hard to use an average flux limiter in the FL model to obtain the same hohlraum plasma status and emission with those under the NM model.},
doi = {10.1063/1.3677357},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 1,
volume = 19,
place = {United States},
year = {2012},
month = {1}
}