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

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.

doi:10.1063/1.5112759

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

Journal Article · 31 July 2019 · Physics of Plasmas

DOI: https://doi.org/10.1063/1.5112759 · OSTI ID:1559445

^[1]; Shah, R. C. ^[2]; Regan, S. P. ^[2];

^[2]; Igumenshchev, I. V. ^[2];

^[2]; Christopherson, A. R. ^[2]; Theobald, W. ^[2];

^[2]; Goncharov, V. N. ^[2]

Univ. of Rochester, Rochester, NY (United States). Laboratory for Laser Energetics; Laboratory for Laser Energetics, University of Rochester
Univ. of Rochester, Rochester, NY (United States). Laboratory for Laser Energetics

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 T_e, neutron-weighted T_i, 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 T_i. 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 (1_max = 200).

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Research Organization:: Univ. of Rochester, Rochester, NY (United States). Laboratory for Laser Energetics

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0003856

OSTI ID:: 1559445

Report Number(s):: 2019--43, 1514, 2475; 2019-43, 1514, 2475

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 8 Vol. 26; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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