First Observation of Cross-Beam Energy Transfer Mitigation for Direct-Drive Inertial Confinement Fusion Implosions Using Wavelength Detuning at the National Ignition Facility

Marozas, J. A.; Hohenberger, M.; Rosenberg, M. J.; Turnbull, D.; Collins, T. J.  B.; Radha, P. B.; McKenty, P. W.; Zuegel, J. D.; Marshall, F. J.; Regan, S. P.; Sangster, T. C.; Seka, W.; Campbell, E. M.; Goncharov, V. N.; Bowers, M. W.; Di Nicola, J. -M.  G.; Erbert, G.; MacGowan, B. J.; Pelz, L. J.; Yang, S. T.

doi:10.1103/PhysRevLett.120.085001

Title: First Observation of Cross-Beam Energy Transfer Mitigation for Direct-Drive Inertial Confinement Fusion Implosions Using Wavelength Detuning at the National Ignition Facility

Journal Article · Thu Feb 22 00:00:00 EST 2018 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.120.085001· OSTI ID:1423123

Marozas, J. A. ^[1]; Hohenberger, M. ^[1]; Rosenberg, M. J. ^[1]; Turnbull, D. ^[1]; Collins, T. J. B. ^[1]; Radha, P. B. ^[1]; McKenty, P. W. ^[1]; Zuegel, J. D. ^[1]; Marshall, F. J. ^[1]; Regan, S. P. ^[1]; Sangster, T. C. ^[1]; Seka, W. ^[1]; Campbell, E. M. ^[1]; Goncharov, V. N. ^[1]; Bowers, M. W. ^[2]; Di Nicola, J. -M. G. ^[2]; Erbert, G. ^[2]; MacGowan, B. J. ^[2]; Pelz, L. J. ^[2]; Yang, S. T. ^[2]

Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Cross-beam energy transfer (CBET) results from two-beam energy exchange via seeded stimulated Brillouin scattering, which detrimentally reduces ablation pressure and implosion velocity in direct-drive inertial confinement fusion. Direct-drive implosions at the National Ignition Facility were conducted to reduce CBET by detuning the laser-source wavelengths (±2.3 Å UV) of the interacting beams over the equatorial region of the target. For the first time, wavelength detuning was shown to increase the equatorial region velocity experimentally by 16% and to alter the in-flight shell morphology. These experimental observations are consistent with design predictions of radiation–hydrodynamic simulations that indicate a 10% increase in the average ablation pressure.

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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); New York State Energy Research and Development Authority (NYSERDA)

Grant/Contract Number:: NA0001944

OSTI ID:: 1423123

Alternate ID(s):: OSTI ID: 1422256

Report Number(s):: 2017-38; 13-76; PRLTAO; 2017-38, 2333, 1376; TRN: US1801708

Journal Information:: Physical Review Letters, Vol. 120, Issue 8; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 56 works

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Wavelength-detuning cross-beam energy transfer mitigation scheme for direct drive: Modeling and evidence from National Ignition Facility implosions Marozas, J. A.; Hohenberger, M.; Rosenberg, M. J. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5022181	journal	May 2018
Mitigation of cross-beam energy transfer in ignition-scale polar-direct-drive target designs for the National Ignition Facility Collins, T. J. B.; Marozas, J. A. Physics of Plasmas, Vol. 25, Issue 7 https://doi.org/10.1063/1.5039513	journal	July 2018
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