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Title: Wavelength-detuning cross-beam energy transfer mitigation scheme for direct drive: Modeling and evidence from National Ignition Facility implosions

Abstract

Here, cross-beam energy transfer (CBET) results from two-beam energy exchange via seeded stimulated Brillouin scattering, which detrimentally reduces laser-energy absorption for direct-drive inertial confinement fusion. Consequently, ablation pressure and implosion velocity suffer from the decreased absorption, reducing target performance in both symmetric and polar direct drive. Additionally, CBET alters the time-resolved scattered-light spectra and redistributes absorbed and scattered-light–changing shell morphology and low-mode drive symmetry. Mitigating CBET is demonstrated in inertial confinement implosions at the National Ignition Facility by detuning the laser-source wavelengths (±2.3 Å UV) of the interacting beams. In polar direct drive, 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. These results indicate that wavelength detuning successfully mitigates CBET. Simulations predict that optimized phase plates and wavelength-detuning CBET mitigation utilizing the three-legged beam layout of the OMEGA Laser System significantly increase absorption and achieve >100-Gbar hot-spot pressures in symmetric direct drive.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [1];  [1]; ORCiD logo [1];  [1]; ORCiD logo [1];  [1];  [1]; ORCiD logo [1];  [1]; ORCiD logo [1];  [1];  [2];  [2];  [2];  [2];  [2];  [2] more »;  [2] « less
  1. Univ. of Rochester, Rochester, NY (United States). Lab. for Laser Energetics
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1444067
Alternate Identifier(s):
OSTI ID: 1439134
Grant/Contract Number:  
NA0001944
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 5; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CBET; ICF; NIF; LPI; wavelength detuning

Citation Formats

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., Moody, J., and Yang, S. T. Wavelength-detuning cross-beam energy transfer mitigation scheme for direct drive: Modeling and evidence from National Ignition Facility implosions. United States: N. p., 2018. Web. doi:10.1063/1.5022181.
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., Moody, J., & Yang, S. T. Wavelength-detuning cross-beam energy transfer mitigation scheme for direct drive: Modeling and evidence from National Ignition Facility implosions. United States. https://doi.org/10.1063/1.5022181
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., Moody, J., and Yang, S. T. Fri . "Wavelength-detuning cross-beam energy transfer mitigation scheme for direct drive: Modeling and evidence from National Ignition Facility implosions". United States. https://doi.org/10.1063/1.5022181. https://www.osti.gov/servlets/purl/1444067.
@article{osti_1444067,
title = {Wavelength-detuning cross-beam energy transfer mitigation scheme for direct drive: Modeling and evidence from National Ignition Facility implosions},
author = {Marozas, J. A. and Hohenberger, M. and Rosenberg, M. J. and Turnbull, D. and Collins, T. J. B. and Radha, P. B. and McKenty, P. W. and Zuegel, J. D. and Marshall, F. J. and Regan, S. P. and Sangster, T. C. and Seka, W. and Campbell, E. M. and Goncharov, V. N. and Bowers, M. W. and Di Nicola, J. -M. G. and Erbert, G. and MacGowan, B. J. and Pelz, L. J. and Moody, J. and Yang, S. T.},
abstractNote = {Here, cross-beam energy transfer (CBET) results from two-beam energy exchange via seeded stimulated Brillouin scattering, which detrimentally reduces laser-energy absorption for direct-drive inertial confinement fusion. Consequently, ablation pressure and implosion velocity suffer from the decreased absorption, reducing target performance in both symmetric and polar direct drive. Additionally, CBET alters the time-resolved scattered-light spectra and redistributes absorbed and scattered-light–changing shell morphology and low-mode drive symmetry. Mitigating CBET is demonstrated in inertial confinement implosions at the National Ignition Facility by detuning the laser-source wavelengths (±2.3 Å UV) of the interacting beams. In polar direct drive, 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. These results indicate that wavelength detuning successfully mitigates CBET. Simulations predict that optimized phase plates and wavelength-detuning CBET mitigation utilizing the three-legged beam layout of the OMEGA Laser System significantly increase absorption and achieve >100-Gbar hot-spot pressures in symmetric direct drive.},
doi = {10.1063/1.5022181},
url = {https://www.osti.gov/biblio/1444067}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 25,
place = {United States},
year = {2018},
month = {5}
}

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Works referenced in this record:

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journal, May 2004


Suppressing Two-Plasmon Decay with Laser Frequency Detuning
journal, March 2018


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    Works referencing / citing this record:

    Observation of persistent species temperature separation in inertial confinement fusion mixtures
    journal, January 2020


    Real and complex valued geometrical optics inverse ray-tracing for inline field calculations
    journal, March 2019


    Modeling of direct-drive cylindrical implosion experiments with an Eulerian radiation-hydrodynamics code
    journal, April 2019


    Using cylindrical implosions to investigate hydrodynamic instabilities in convergent geometry
    journal, November 2019


    Direct-drive double-shell implosion: A platform for burning-plasma physics studies
    journal, December 2019