Stimulated backscatter of laser light from BigFoot hohlraums on the National Ignition Facility

Berger, R. L.; Thomas, C. A.; Baker, K. L.; Casey, D. T.; Goyon, C. S.; Park, J.; Lemos, N.; Khan, S. F.; Hohenberger, M.; Milovich, J. L.; Strozzi, D. J.; Belyaev, M. A.; Chapman, T.; Langdon, A. B.

doi:10.1063/1.5079234

Title: Stimulated backscatter of laser light from BigFoot hohlraums on the National Ignition Facility

Journal Article · 23 January 2019 · Physics of Plasmas

DOI: https://doi.org/10.1063/1.5079234 · OSTI ID:1545352

^[1];

^[1]; Baker, K. L. ^[1]; Casey, D. T. ^[1];

^[1];

^[1]; Lemos, N. ^[1]; Khan, S. F. ^[1];

^[1]; Milovich, J. L. ^[1];

^[1]; Belyaev, M. A. ^[1]; Chapman, T. ^[1]; Langdon, A. B. ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

The high implosion velocity, high adiabat BigFoot design [Casey et al., Phys. Plasmas 25, 056308 (2018)] has produced the highest neutron yield to date in an ignition hohlraum on the National Ignition Facility. It has used up to 500 TW of peak power and nearly 2 MJ of laser energy in pulses up to 8 ns in duration, with the goal of fielding controlled implosions with high coupled energy, which can suppress deleterious hydrodynamic instabilities. However, when the laser pulse exceeds 6 ns with the laser energy greater than 1.6 MJ, stimulated Brillouin scattering (SBS) reaches levels that may damage optical components in the laser. Pending development of techniques to reduce SBS, limitation of laser power, and energy to avoid damage prevents the full exploitation of this approach to ignition. In this manuscript, we present three-dimensional simulations that match the experimentally measured SBS energy, in particular, reproducing quantitatively the time in the pulse when maximum backscatter occurs, and its magnitude across ~10 BigFoot experiments. The demonstrated robustness of the modeling, which combines LASNEX and pF3D simulations, motivates us to explore and recommend several feasible SBS mitigation strategies: modified laser pointing, different laser frequencies for each cone of beams, increased laser bandwidth on all or some of the cones, and materials with a mixture of light and heavy atoms lining the inside of the hohlraum walls.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1545352

Report Number(s):: LLNL-JRNL--759467

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 1 Vol. 26; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Maintaining low-mode symmetry control with extended pulse shapes for lower-adiabat Bigfoot implosions on the National Ignition Facility Hohenberger, M.; Casey, D. T.; Thomas, C. A. Physics of Plasmas, Vol. 26, Issue 11 https://doi.org/10.1063/1.5121435	journal	November 2019

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