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

Journal Article · · Physics of Plasmas
DOI: https://doi.org/10.1063/1.5022181 · OSTI ID:1444067

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.

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)
Grant/Contract Number:
NA0001944; AC52-07NA27344
OSTI ID:
1444067
Alternate ID(s):
OSTI ID: 1439134; OSTI ID: 1873239
Report Number(s):
LLNL-JRNL-836148; 2017-123, 1406, 2362
Journal Information:
Physics of Plasmas, Vol. 25, Issue 5; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 33 works
Citation information provided by
Web of Science

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Cited By (7)

Mitigation of cross-beam energy transfer in ignition-scale polar-direct-drive target designs for the National Ignition Facility journal July 2018
Mitigating laser-imprint effects in direct-drive inertial confinement fusion implosions with an above-critical-density foam layer journal August 2018
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
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
Observation of persistent species temperature separation in inertial confinement fusion mixtures journal January 2020