Origins and Scaling of Hot-Electron Preheat in Ignition-Scale Direct-Drive Inertial Confinement Fusion Experiments

Rosenberg, M. J.; Solodov, A. A.; Myatt, J. F.; Seka, W.; Michel, P.; Hohenberger, M.; Short, R. W.; Epstein, R.; Regan, S. P.; Campbell, E. M.; Chapman, T.; Goyon, C.; Ralph, J. E.; Barrios, M. A.; Moody, J. D.; Bates, J. W.

doi:10.1103/PhysRevLett.120.055001

Title: Origins and Scaling of Hot-Electron Preheat in Ignition-Scale Direct-Drive Inertial Confinement Fusion Experiments

Journal Article · Mon Jan 29 00:00:00 EST 2018 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.120.055001· OSTI ID:1423128

Rosenberg, M. J. ^[1]; Solodov, A. A. ^[1]; Myatt, J. F. ^[1]; Seka, W. ^[1]; Michel, P. ^[2]; Hohenberger, M. ^[2]; Short, R. W. ^[1]; Epstein, R. ^[1]; Regan, S. P. ^[1]; Campbell, E. M. ^[1]; Chapman, T. ^[2]; Goyon, C. ^[2]; Ralph, J. E. ^[2]; Barrios, M. A. ^[2]; Moody, J. D. ^[2]; Bates, J. W. ^[3]

Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Naval Research Lab. (NRL), Washington, DC (United States)

Planar laser-plasma interaction (LPI) experiments at the National Ignition Facility (NIF) have allowed access for the rst time to regimes of electron density scale length (~500 to 700 μm), electron temperature (~3 to 5 keV), and laser intensity (6 to 16 x 10¹⁴ W/cm²) that are relevant to direct-drive inertial confinement fusion ignition. Unlike in shorter-scale-length plasmas on OMEGA, scattered-light data on the NIF show that the near-quarter-critical LPI physics is dominated by stimulated Raman scattering (SRS) rather than by two-plasmon decay (TPD). This difference in regime is explained based on absolute SRS and TPD threshold considerations. SRS sidescatter tangential to density contours and other SRS mechanisms are observed. The fraction of laser energy converted to hot electrons is ~0.7% to 2.9%, consistent with observed levels of SRS. The intensity threshold for hot-electron production is assessed, and the use of a Si ablator slightly increases this threshold from ~4 x 10¹⁴ to ~6 x 10¹⁴ W/cm². These results have significant implications for mitigation of LPI hot-electron preheat in direct-drive ignition designs.

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

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); Univ. of Rochester, NY (United States); New York State Energy Research and Development Authority (NYSERDA)

Grant/Contract Number:: NA0001944

OSTI ID:: 1423128

Alternate ID(s):: OSTI ID: 1418402

Report Number(s):: 2017-65; 1374; PRLTAO; 2017-65, 2331, 1374; TRN: US1801712

Journal Information:: Physical Review Letters, Vol. 120, Issue 5; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 91 works

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