Full-wave and ray-based modeling of cross-beam energy transfer between laser beams with distributed phase plates and polarization smoothing

Follett, R. K.; Edgell, D. H.; Froula, D. H.; Goncharov, V. N.; Igumenshchev, I. V.; Shaw, J. G.; Myatt, J. F.

doi:10.1063/1.4998713

Title: Full-wave and ray-based modeling of cross-beam energy transfer between laser beams with distributed phase plates and polarization smoothing

Journal Article · Fri Oct 20 00:00:00 EDT 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4998713· OSTI ID:1405333

Follett, R. K. ^[1]; Edgell, D. H. ^[1];

^[1]; Goncharov, V. N. ^[1];

^[1];

^[1]; Myatt, J. F. ^[2]

Univ. of Rochester, Rochester, NY (United States). Lab. for Laser Energetics
Univ. of Rochester, Rochester, NY (United States). Lab. for Laser Energetics; Univ. of Alberta, Edmonton, AB (Canada)

Radiation-hydrodynamic simulations of inertial confinement fusion (ICF) experiments rely on ray-based cross-beam energy transfer (CBET) models to calculate laser energy deposition. The ray-based models assume locally plane-wave laser beams and polarization averaged incoherence between laser speckles for beams with polarization smoothing. The impact of beam speckle and polarization smoothing on crossbeam energy transfer (CBET) are studied using the 3-D wave-based laser-plasma-interaction code LPSE. The results indicate that ray-based models under predict CBET when the assumption of spatially averaged longitudinal incoherence across the CBET interaction region is violated. A model for CBET between linearly-polarized speckled beams is presented that uses ray tracing to solve for the real speckle pattern of the unperturbed laser beams within the eikonal approximation and gives excellent agreement with the wavebased calculations. Lastly, OMEGA-scale 2-D LPSE calculations using ICF relevant plasma conditions suggest that the impact of beam speckle on laser absorption calculations in ICF implosions is small (< 1%).

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Research Organization:: Univ. of Rochester, NY (United States). Lab. for Laser Energetics

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Contributing Organization:: Laboratory for Laser Energetics, University of Rochester

Grant/Contract Number:: NA0001944

OSTI ID:: 1405333

Alternate ID(s):: OSTI ID: 1400428

Report Number(s):: 2017-100, 1359; 2017-100, 2317, 1359; TRN: US1703253

Journal Information:: Physics of Plasmas, Vol. 24, Issue 10; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 18 works

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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
Real and complex valued geometrical optics inverse ray-tracing for inline field calculations Colaïtis, A.; Palastro, J. P.; Follett, R. K. Physics of Plasmas, Vol. 26, Issue 3 https://doi.org/10.1063/1.5082951	journal	March 2019
Adaptive inverse ray-tracing for accurate and efficient modeling of cross beam energy transfer in hydrodynamics simulations Colaïtis, A.; Follett, R. K.; Palastro, J. P. Physics of Plasmas, Vol. 26, Issue 7 https://doi.org/10.1063/1.5108777	journal	July 2019
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Crossed-beam energy transfer: polarization effects and evidence of saturation Turnbull, D.; Colaïtis, A.; Follett, R. K. Plasma Physics and Controlled Fusion, Vol. 60, Issue 5 https://doi.org/10.1088/1361-6587/aab6d3	journal	April 2018

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