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