Hot-electron generation at direct-drive ignition-relevant plasma conditions at the National Ignition Facility

Solodov, A. A.; Rosenberg, M. J.; Seka, W.; Myatt, J. F.; Hohenberger, M.; Epstein, R.; Stoeckl, C.; Short, R. W.; Regan, S. P.; Michel, P.; Chapman, T.; Follett, R. K.; Palastro, J. P.; Froula, D. H.; Radha, P. B.; Moody, J. D.; Goncharov, V. N.

doi:10.1063/1.5134044

Hot-electron generation at direct-drive ignition-relevant plasma conditions at the National Ignition Facility

Journal Article · Wed May 06 00:00:00 EDT 2020 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5134044· OSTI ID:1617890

Solodov, A. A. ^[1]; Rosenberg, M. J. ^[2]; Seka, W. ^[2]; Myatt, J. F. ^[3]; ^[4]; ^[2]; Stoeckl, C. ^[2]; Short, R. W. ^[2]; Regan, S. P. ^[2]; Michel, P. ^[4]; Chapman, T. ^[4]; Follett, R. K. ^[2]; ^[2]; ^[2]; ^[2]; Moody, J. D. ^[4]; Goncharov, V. N. ^[2]

Univ. of Rochester, NY (United States). Lab. for Laser Energetics; Laboratory for Laser Energetics, University of Rochester
Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Univ. of Alberta, Edmonton, AB (Canada)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Laser–plasma interaction instabilities can be detrimental for direct-drive inertial confinement fusion by generating high-energy electrons that preheat the target. Moreover, an experimental platform has been developed and fielded on the National Ignition Facility to investigate hot-electron production from laser–plasma instabilities at direct-drive ignition-relevant conditions. The radiation-hydrodynamic code DRACO has been used to design planar-target experiments that generate plasma and interaction conditions comparable to direct-drive ignition designs: I_L~10¹⁵ W/cm², T_e > 3 keV, and density-gradient scale lengths of L_n~ 600 μm in the quarter-critical density region. The hot-electron properties were inferred by comparing the experimentally observed hard x-ray spectra to Monte Carlo simulations of hard x-ray emission from hot electrons depositing energy in the target. Hot-electron temperatures of ~40 keV to 60 keV and the fraction of laser energy converted to hot electrons of ~0.5% to 5% were inferred in plastic targets for laser intensities at the quarter-critical density surface of (~4 to 14) × 10¹⁴ W/cm². The use of silicon ablators was found to mitigate the hot-electron preheat by increasing the threshold laser intensity for hot-electron generation from ~3.5 × 10¹⁴ W/cm² in plastic to ~6 × 10¹⁴ W/cm² in silicon. The overall hot-electron production is further reduced in silicon ablators when the intensity threshold is exceeded.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Univ. of Rochester, NY (United States). Lab. for Laser Energetics

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

Grant/Contract Number:: AC52-07NA27344; NA0003856

OSTI ID:: 1617890

Alternate ID(s):: OSTI ID: 1617433
OSTI ID: 1881630

Report Number(s):: 1560; 2019-298; 2516; LLNL-JRNL-838631; 2019-298, 1560, 2516

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 27; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Hot-electron generation at direct-drive ignition-relevant plasma conditions at the National Ignition Facility

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