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Title: Modelling debris and shrapnel generation in inertial confinement fusion experiments

Modelling and mitigation of damage are crucial for safe and economical operation of high-power laser facilities. Experiments at the National Ignition Facility use a variety of targets with a range of laser energies spanning more than two orders of magnitude (~14 kJ to ~1.9 MJ). Low-energy inertial confinement fusion experiments are used to study early-time x-ray load symmetry on the capsule, shock timing, and other physics issues. For these experiments, a significant portion of the target is not completely vaporized and late-time (hundreds of ns) simulations are required to study the generation of debris and shrapnel from these targets. Damage to optics and diagnostics from shrapnel is a major concern for low-energy experiments. Here, we provide the first full-target simulations of entire cryogenic targets, including the Al thermal mechanical package and Si cooling rings. We use a 3D multi-physics multi-material hydrodynamics code, ALE-AMR, for these late-time simulations. The mass, velocity, and spatial distribution of shrapnel are calculated for three experiments with laser energies ranging from 14 to 250 kJ. We calculate damage risk to optics and diagnostics for these three experiments. For the lowest energy re-emit experiment, we provide a detailed analysis of the effects of shrapnel impacts on opticsmore » and diagnostics and compare with observations of damage sites.« less
Authors:
 [1] ;  [1] ;  [2] ;  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-626315
Journal ID: ISSN 0029-5515
Grant/Contract Number:
AC52-07NA27344; AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 53; Journal Issue: 11; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC); Univ. of California, San Diego, CA (United States)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 70 PLASMA PHYSICS AND FUSION
OSTI Identifier:
1438620

Eder, D. C., Fisher, A. C., Koniges, A. E., and Masters, N. D.. Modelling debris and shrapnel generation in inertial confinement fusion experiments. United States: N. p., Web. doi:10.1088/0029-5515/53/11/113037.
Eder, D. C., Fisher, A. C., Koniges, A. E., & Masters, N. D.. Modelling debris and shrapnel generation in inertial confinement fusion experiments. United States. doi:10.1088/0029-5515/53/11/113037.
Eder, D. C., Fisher, A. C., Koniges, A. E., and Masters, N. D.. 2013. "Modelling debris and shrapnel generation in inertial confinement fusion experiments". United States. doi:10.1088/0029-5515/53/11/113037. https://www.osti.gov/servlets/purl/1438620.
@article{osti_1438620,
title = {Modelling debris and shrapnel generation in inertial confinement fusion experiments},
author = {Eder, D. C. and Fisher, A. C. and Koniges, A. E. and Masters, N. D.},
abstractNote = {Modelling and mitigation of damage are crucial for safe and economical operation of high-power laser facilities. Experiments at the National Ignition Facility use a variety of targets with a range of laser energies spanning more than two orders of magnitude (~14 kJ to ~1.9 MJ). Low-energy inertial confinement fusion experiments are used to study early-time x-ray load symmetry on the capsule, shock timing, and other physics issues. For these experiments, a significant portion of the target is not completely vaporized and late-time (hundreds of ns) simulations are required to study the generation of debris and shrapnel from these targets. Damage to optics and diagnostics from shrapnel is a major concern for low-energy experiments. Here, we provide the first full-target simulations of entire cryogenic targets, including the Al thermal mechanical package and Si cooling rings. We use a 3D multi-physics multi-material hydrodynamics code, ALE-AMR, for these late-time simulations. The mass, velocity, and spatial distribution of shrapnel are calculated for three experiments with laser energies ranging from 14 to 250 kJ. We calculate damage risk to optics and diagnostics for these three experiments. For the lowest energy re-emit experiment, we provide a detailed analysis of the effects of shrapnel impacts on optics and diagnostics and compare with observations of damage sites.},
doi = {10.1088/0029-5515/53/11/113037},
journal = {Nuclear Fusion},
number = 11,
volume = 53,
place = {United States},
year = {2013},
month = {10}
}