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Title: The role of incidence angle in the laser ablation of a planar target

Abstract

The effect of the laser ray incidence angle on the mass ablation rate and ablation pressure of planar inertial confinement fusion (ICF) targets is explored. In this work, a modified version of the textbook model of laser ablation is used to demonstrate that the mass ablation rate and ablation pressure scale with the 4/3 and 2/3 power of the cosine of the laser ray incidence angle relative to the target normal. Using an idealized planar model of ablation, it is demonstrated that constant irradiance is insufficient to produce similar velocities of a target when comparing cases driven at different incidence angles. Additionally, the effect of the incidence angle on the absorption fraction is demonstrated and it is shown that a longer duration is needed to achieve maximum absorption for greater angles. This further affects the mass ablation rate and ablation pressure in the first nanosecond of ablation. Here these results, when extrapolated, may provide insight into the variation of drive conditions encountered due to incidence in polar direct drive ICF.

Authors:
 [1]; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1495160
Report Number(s):
LA-UR-18-29321
Journal ID: ISSN 1070-664X
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 26; Journal Issue: 2; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Scheiner, Brett, and Schmitt, Mark. The role of incidence angle in the laser ablation of a planar target. United States: N. p., 2019. Web. doi:10.1063/1.5085122.
Scheiner, Brett, & Schmitt, Mark. The role of incidence angle in the laser ablation of a planar target. United States. doi:10.1063/1.5085122.
Scheiner, Brett, and Schmitt, Mark. Mon . "The role of incidence angle in the laser ablation of a planar target". United States. doi:10.1063/1.5085122. https://www.osti.gov/servlets/purl/1495160.
@article{osti_1495160,
title = {The role of incidence angle in the laser ablation of a planar target},
author = {Scheiner, Brett and Schmitt, Mark},
abstractNote = {The effect of the laser ray incidence angle on the mass ablation rate and ablation pressure of planar inertial confinement fusion (ICF) targets is explored. In this work, a modified version of the textbook model of laser ablation is used to demonstrate that the mass ablation rate and ablation pressure scale with the 4/3 and 2/3 power of the cosine of the laser ray incidence angle relative to the target normal. Using an idealized planar model of ablation, it is demonstrated that constant irradiance is insufficient to produce similar velocities of a target when comparing cases driven at different incidence angles. Additionally, the effect of the incidence angle on the absorption fraction is demonstrated and it is shown that a longer duration is needed to achieve maximum absorption for greater angles. This further affects the mass ablation rate and ablation pressure in the first nanosecond of ablation. Here these results, when extrapolated, may provide insight into the variation of drive conditions encountered due to incidence in polar direct drive ICF.},
doi = {10.1063/1.5085122},
journal = {Physics of Plasmas},
number = 2,
volume = 26,
place = {United States},
year = {2019},
month = {2}
}

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Works referenced in this record:

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