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Title: Observation and modeling of interspecies ion separation in inertial confinement fusion implosions via imaging x-ray spectroscopy

Abstract

In this article, we report the first direct experimental evidence of interspecies ion separation in direct-drive inertial confinement fusion experiments performed at the OMEGA laser facility via spectrally, temporally, and spatially resolved imaging x-ray-spectroscopy data [S. C. Hsu et al., Europhys. Lett. 115, 65001 (2016)]. These experiments were designed based on the expectation that interspecies ion thermo-diffusion would be the strongest for species with a large mass and charge difference. The targets were spherical plastic shells filled with D2 and a trace amount of Ar (0.1% or 1% by atom). Ar K-shell spectral features were observed primarily between the time of first-shock convergence and slightly before the neutron bang time, using a time- and space-integrated spectrometer, a streaked crystal spectrometer, and two gated multi-monochromatic x-ray imagers fielded along quasi-orthogonal lines of sight. Detailed spectroscopic analyses of spatially resolved Ar K-shell lines reveal the deviation from the initial 1% Ar gas fill and show both Ar-concentration enhancement and depletion at different times and radial positions of the implosion. The experimental results are interpreted using radiation-hydrodynamic simulations that include recently implemented, first-principles models of interspecies ion diffusion. Lastly, the experimentally inferred Ar-atom fraction profiles agree reasonably with calculated profiles associated with themore » incoming and rebounding first shock.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [2]; ORCiD logo [1]; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Univ. of Nevada, Reno, NV (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1356144
Report Number(s):
LA-UR-16-29528
Journal ID: ISSN 1070-664X
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 5; 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; Interspecies ion separation, MMI

Citation Formats

Joshi, Tirtha Raj, Hakel, Peter, Hsu, Scott C., Vold, Erik Lehman, Schmitt, Mark J., Hoffman, Nelson M., Rauenzahn, Rick M., Kagan, Grigory, Tang, Xianzhu, Mancini, R. C., Kim, Yong Ho, and Herrmann, Hans W.. Observation and modeling of interspecies ion separation in inertial confinement fusion implosions via imaging x-ray spectroscopy. United States: N. p., 2017. Web. doi:10.1063/1.4978887.
Joshi, Tirtha Raj, Hakel, Peter, Hsu, Scott C., Vold, Erik Lehman, Schmitt, Mark J., Hoffman, Nelson M., Rauenzahn, Rick M., Kagan, Grigory, Tang, Xianzhu, Mancini, R. C., Kim, Yong Ho, & Herrmann, Hans W.. Observation and modeling of interspecies ion separation in inertial confinement fusion implosions via imaging x-ray spectroscopy. United States. doi:10.1063/1.4978887.
Joshi, Tirtha Raj, Hakel, Peter, Hsu, Scott C., Vold, Erik Lehman, Schmitt, Mark J., Hoffman, Nelson M., Rauenzahn, Rick M., Kagan, Grigory, Tang, Xianzhu, Mancini, R. C., Kim, Yong Ho, and Herrmann, Hans W.. Wed . "Observation and modeling of interspecies ion separation in inertial confinement fusion implosions via imaging x-ray spectroscopy". United States. doi:10.1063/1.4978887. https://www.osti.gov/servlets/purl/1356144.
@article{osti_1356144,
title = {Observation and modeling of interspecies ion separation in inertial confinement fusion implosions via imaging x-ray spectroscopy},
author = {Joshi, Tirtha Raj and Hakel, Peter and Hsu, Scott C. and Vold, Erik Lehman and Schmitt, Mark J. and Hoffman, Nelson M. and Rauenzahn, Rick M. and Kagan, Grigory and Tang, Xianzhu and Mancini, R. C. and Kim, Yong Ho and Herrmann, Hans W.},
abstractNote = {In this article, we report the first direct experimental evidence of interspecies ion separation in direct-drive inertial confinement fusion experiments performed at the OMEGA laser facility via spectrally, temporally, and spatially resolved imaging x-ray-spectroscopy data [S. C. Hsu et al., Europhys. Lett. 115, 65001 (2016)]. These experiments were designed based on the expectation that interspecies ion thermo-diffusion would be the strongest for species with a large mass and charge difference. The targets were spherical plastic shells filled with D2 and a trace amount of Ar (0.1% or 1% by atom). Ar K-shell spectral features were observed primarily between the time of first-shock convergence and slightly before the neutron bang time, using a time- and space-integrated spectrometer, a streaked crystal spectrometer, and two gated multi-monochromatic x-ray imagers fielded along quasi-orthogonal lines of sight. Detailed spectroscopic analyses of spatially resolved Ar K-shell lines reveal the deviation from the initial 1% Ar gas fill and show both Ar-concentration enhancement and depletion at different times and radial positions of the implosion. The experimental results are interpreted using radiation-hydrodynamic simulations that include recently implemented, first-principles models of interspecies ion diffusion. Lastly, the experimentally inferred Ar-atom fraction profiles agree reasonably with calculated profiles associated with the incoming and rebounding first shock.},
doi = {10.1063/1.4978887},
journal = {Physics of Plasmas},
number = 5,
volume = 24,
place = {United States},
year = {Wed Mar 22 00:00:00 EDT 2017},
month = {Wed Mar 22 00:00:00 EDT 2017}
}

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