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Title: Hard X-ray Imaging for Measuring Laser Absorption Spatial Profiles on the National Ignition Facility

Abstract

Hard x-ray (''Thin wall'') imaging will be employed on the National Ignition Facility (NIF) to spatially locate laser beam energy deposition regions on the hohlraum walls in indirect drive Inertial Confinement Fusion (ICF) experiments, relevant for ICF symmetry tuning. Based on time resolved imaging of the hard x-ray emission of the laser spots, this method will be used to infer hohlraum wall motion due to x-ray and laser ablation and any beam refraction caused by plasma density gradients. In optimizing this measurement, issues that have to be addressed are hard x-ray visibility during the entire ignition laser pulse with intensities ranging from 10{sup 13} to 10{sup 15} W/cm{sup 2}, as well as simultaneous visibility of the inner and the outer laser drive cones. In this work we will compare the hard x-ray emission calculated by LASNEX and analytical modeling with thin wall imaging data recorded previously on Omega and during the first hohlraum experiments on NIF. Based on these calculations and comparisons the thin wall imaging will be optimized for ICF/NIF experiments.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
897970
Report Number(s):
UCRL-CONF-221138
Journal ID: ISSN 0034--6748; TRN: US200706%%161
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Journal Volume: 77; Journal Issue: 10; Conference: Presented at: High Temperature Plasma Diagnostics, Williamsburg, VA, United States, May 07 - May 11, 2006
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 42 ENGINEERING; ABLATION; ABSORPTION; CONES; IGNITION; INERTIAL CONFINEMENT; LASERS; PLASMA DENSITY; PLASMA DIAGNOSTICS; REFRACTION; SIMULATION; SYMMETRY; TUNING; US NATIONAL IGNITION FACILITY; VISIBILITY

Citation Formats

Dewald, E L, Jones, O S, Landen, O L, Suter, L, Amendt, P, Turner, R E, and Regan, S. Hard X-ray Imaging for Measuring Laser Absorption Spatial Profiles on the National Ignition Facility. United States: N. p., 2006. Web. doi:10.1063/1.2216991.
Dewald, E L, Jones, O S, Landen, O L, Suter, L, Amendt, P, Turner, R E, & Regan, S. Hard X-ray Imaging for Measuring Laser Absorption Spatial Profiles on the National Ignition Facility. United States. doi:10.1063/1.2216991.
Dewald, E L, Jones, O S, Landen, O L, Suter, L, Amendt, P, Turner, R E, and Regan, S. Tue . "Hard X-ray Imaging for Measuring Laser Absorption Spatial Profiles on the National Ignition Facility". United States. doi:10.1063/1.2216991. https://www.osti.gov/servlets/purl/897970.
@article{osti_897970,
title = {Hard X-ray Imaging for Measuring Laser Absorption Spatial Profiles on the National Ignition Facility},
author = {Dewald, E L and Jones, O S and Landen, O L and Suter, L and Amendt, P and Turner, R E and Regan, S},
abstractNote = {Hard x-ray (''Thin wall'') imaging will be employed on the National Ignition Facility (NIF) to spatially locate laser beam energy deposition regions on the hohlraum walls in indirect drive Inertial Confinement Fusion (ICF) experiments, relevant for ICF symmetry tuning. Based on time resolved imaging of the hard x-ray emission of the laser spots, this method will be used to infer hohlraum wall motion due to x-ray and laser ablation and any beam refraction caused by plasma density gradients. In optimizing this measurement, issues that have to be addressed are hard x-ray visibility during the entire ignition laser pulse with intensities ranging from 10{sup 13} to 10{sup 15} W/cm{sup 2}, as well as simultaneous visibility of the inner and the outer laser drive cones. In this work we will compare the hard x-ray emission calculated by LASNEX and analytical modeling with thin wall imaging data recorded previously on Omega and during the first hohlraum experiments on NIF. Based on these calculations and comparisons the thin wall imaging will be optimized for ICF/NIF experiments.},
doi = {10.1063/1.2216991},
journal = {},
number = 10,
volume = 77,
place = {United States},
year = {Tue Apr 25 00:00:00 EDT 2006},
month = {Tue Apr 25 00:00:00 EDT 2006}
}

Conference:
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