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Title: On the structure of quasi-stationary laser ablation fronts in strongly radiating plasmas

Abstract

The effect of strong thermal radiation on the structure of quasi-stationary laser ablation fronts is investigated under the assumption that all the laser flux is absorbed at the critical surface. Special attention is paid to adequate formulation of the boundary-value problem for a steady-state planar ablation flow. The dependence of the laser-to-x-ray conversion efficiency ϕ{sub r} on the laser intensity I{sub L} and wavelength λ{sub L} is analyzed within the non-equilibrium diffusion approximation for radiation transfer. The scaling of the main ablation parameters with I{sub L} and λ{sub L} in the strongly radiative regime 1−ϕ{sub r}≪1 is derived. It is demonstrated that strongly radiating ablation fronts develop a characteristic extended cushion of “radiation-soaked” plasma between the condensed ablated material and the critical surface, which can efficiently suppress perturbations from the instabilities at the critical surface.

Authors:
;  [1];  [2];  [1];  [2]
  1. Keldysh Institute of Applied Mathematics, Moscow (Russian Federation)
  2. (Russian Federation)
Publication Date:
OSTI Identifier:
22410338
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 22; Journal Issue: 5; Other Information: (c) 2015 AIP Publishing LLC; 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; ABLATION; BOUNDARY-VALUE PROBLEMS; CONVERSION; DIFFUSION; DIFFUSION EQUATIONS; DISTURBANCES; EFFICIENCY; INSTABILITY; LASER RADIATION; PLASMA; STEADY-STATE CONDITIONS; THERMAL RADIATION; X RADIATION

Citation Formats

Basko, M. M., E-mail: mmbasko@gmail.com, Novikov, V. G., National Research Nuclear University “MEPhI,” Moscow, Grushin, A. S., and RnD-ISAN/EUV Labs, Moscow, Troitsk. On the structure of quasi-stationary laser ablation fronts in strongly radiating plasmas. United States: N. p., 2015. Web. doi:10.1063/1.4921334.
Basko, M. M., E-mail: mmbasko@gmail.com, Novikov, V. G., National Research Nuclear University “MEPhI,” Moscow, Grushin, A. S., & RnD-ISAN/EUV Labs, Moscow, Troitsk. On the structure of quasi-stationary laser ablation fronts in strongly radiating plasmas. United States. doi:10.1063/1.4921334.
Basko, M. M., E-mail: mmbasko@gmail.com, Novikov, V. G., National Research Nuclear University “MEPhI,” Moscow, Grushin, A. S., and RnD-ISAN/EUV Labs, Moscow, Troitsk. Fri . "On the structure of quasi-stationary laser ablation fronts in strongly radiating plasmas". United States. doi:10.1063/1.4921334.
@article{osti_22410338,
title = {On the structure of quasi-stationary laser ablation fronts in strongly radiating plasmas},
author = {Basko, M. M., E-mail: mmbasko@gmail.com and Novikov, V. G. and National Research Nuclear University “MEPhI,” Moscow and Grushin, A. S. and RnD-ISAN/EUV Labs, Moscow, Troitsk},
abstractNote = {The effect of strong thermal radiation on the structure of quasi-stationary laser ablation fronts is investigated under the assumption that all the laser flux is absorbed at the critical surface. Special attention is paid to adequate formulation of the boundary-value problem for a steady-state planar ablation flow. The dependence of the laser-to-x-ray conversion efficiency ϕ{sub r} on the laser intensity I{sub L} and wavelength λ{sub L} is analyzed within the non-equilibrium diffusion approximation for radiation transfer. The scaling of the main ablation parameters with I{sub L} and λ{sub L} in the strongly radiative regime 1−ϕ{sub r}≪1 is derived. It is demonstrated that strongly radiating ablation fronts develop a characteristic extended cushion of “radiation-soaked” plasma between the condensed ablated material and the critical surface, which can efficiently suppress perturbations from the instabilities at the critical surface.},
doi = {10.1063/1.4921334},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 22,
place = {United States},
year = {2015},
month = {5}
}