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Title: Interpreting the electron temperature inferred from x-ray continuum emission for direct-drive inertial confinement fusion implosions on OMEGA

Abstract

In this paper, we present a theoretical framework for interpreting the hot-spot electron temperature ($$T_e$$) inferred from hard (10- to 20-keV) x-ray continuum emission for inertial confinement fusion implosions on OMEGA. We first show that the inferred $$T_e$$ represents the emission-weighted, harmonic mean of the hot-spot $$T_e$$ distribution, both spatially and temporally. A scheme is then provided for selecting a photon energy of which the emission weighting approximates neutron weighting. Simulations are then used to quantify the predicted relationship between the inferred Te, neutron-weighted Ti, and implosion performance on OMEGA. In an ensemble of 1-D simulations, it was observed that hot-spot thermal nonequilibrium precluded a sufficiently unique mapping between the inferred $$T_e$$ and neutron-weighted Ti. In 3-D simulations with low-harmonic-mode perturbations (i.e., laser beam power imbalance, target offset, and beam port geometry departures from spherical symmetry) and laser imprint (1max = 200).

Authors:
ORCiD logo [1];  [1];  [1]; ORCiD logo [1];  [1]; ORCiD logo [1];  [1];  [1]; ORCiD logo [1];  [1]
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  1. Univ. of Rochester, Rochester, NY (United States). Laboratory for Laser Energetics
Publication Date:
Research Org.:
Univ. of Rochester, Rochester, NY (United States). Laboratory for Laser Energetics
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1559445
Report Number(s):
2019-43, 1514, 2475
Journal ID: ISSN 1070-664X; 2019-43, 1514, 2475; TRN: US2000339
Grant/Contract Number:  
NA0003856
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 26; Journal Issue: 8; 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

Cao, D., Shah, R. C., Regan, S. P., Epstein, R., Igumenshchev, I. V., Gopalaswamy, V., Christopherson, A. R., Theobald, W., Radha, P. B., and Goncharov, V. N. Interpreting the electron temperature inferred from x-ray continuum emission for direct-drive inertial confinement fusion implosions on OMEGA. United States: N. p., 2019. Web. doi:10.1063/1.5112759.
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Cao, D., Shah, R. C., Regan, S. P., Epstein, R., Igumenshchev, I. V., Gopalaswamy, V., Christopherson, A. R., Theobald, W., Radha, P. B., & Goncharov, V. N. Interpreting the electron temperature inferred from x-ray continuum emission for direct-drive inertial confinement fusion implosions on OMEGA. United States. doi:10.1063/1.5112759.
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Cao, D., Shah, R. C., Regan, S. P., Epstein, R., Igumenshchev, I. V., Gopalaswamy, V., Christopherson, A. R., Theobald, W., Radha, P. B., and Goncharov, V. N. Thu . "Interpreting the electron temperature inferred from x-ray continuum emission for direct-drive inertial confinement fusion implosions on OMEGA". United States. doi:10.1063/1.5112759. https://www.osti.gov/servlets/purl/1559445.
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@article{osti_1559445,
title = {Interpreting the electron temperature inferred from x-ray continuum emission for direct-drive inertial confinement fusion implosions on OMEGA},
author = {Cao, D. and Shah, R. C. and Regan, S. P. and Epstein, R. and Igumenshchev, I. V. and Gopalaswamy, V. and Christopherson, A. R. and Theobald, W. and Radha, P. B. and Goncharov, V. N.},
abstractNote = {In this paper, we present a theoretical framework for interpreting the hot-spot electron temperature ($T_e$) inferred from hard (10- to 20-keV) x-ray continuum emission for inertial confinement fusion implosions on OMEGA. We first show that the inferred $T_e$ represents the emission-weighted, harmonic mean of the hot-spot $T_e$ distribution, both spatially and temporally. A scheme is then provided for selecting a photon energy of which the emission weighting approximates neutron weighting. Simulations are then used to quantify the predicted relationship between the inferred Te, neutron-weighted Ti, and implosion performance on OMEGA. In an ensemble of 1-D simulations, it was observed that hot-spot thermal nonequilibrium precluded a sufficiently unique mapping between the inferred $T_e$ and neutron-weighted Ti. In 3-D simulations with low-harmonic-mode perturbations (i.e., laser beam power imbalance, target offset, and beam port geometry departures from spherical symmetry) and laser imprint (1max = 200).},
doi = {10.1063/1.5112759},
journal = {Physics of Plasmas},
number = 8,
volume = 26,
place = {United States},
year = {2019},
month = {8}
}
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DOI:  10.1063/1.5112759
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