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

Abstract

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%).

Authors:
 [1];  [1]; ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [1];  [2]
  1. Univ. of Rochester, Rochester, NY (United States). Lab. for Laser Energetics
  2. Univ. of Rochester, Rochester, NY (United States). Lab. for Laser Energetics; Univ. of Alberta, Edmonton, AB (Canada)
Publication Date:
Research Org.:
Univ. of Rochester, Rochester, NY (United States). Lab. for Laser Energetics
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
Contributing Org.:
Laboratory for Laser Energetics, University of Rochester
OSTI Identifier:
1405333
Alternate Identifier(s):
OSTI ID: 1400428
Report Number(s):
2017-100, 1359
Journal ID: ISSN 1070-664X; 2017-100, 2317, 1359; TRN: US1703253
Grant/Contract Number:  
NA0001944
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 10; 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

Citation Formats

Follett, R. K., Edgell, D. H., Froula, D. H., Goncharov, V. N., Igumenshchev, I. V., Shaw, J. G., and Myatt, J. F. Full-wave and ray-based modeling of cross-beam energy transfer between laser beams with distributed phase plates and polarization smoothing. United States: N. p., 2017. Web. doi:10.1063/1.4998713.
Follett, R. K., Edgell, D. H., Froula, D. H., Goncharov, V. N., Igumenshchev, I. V., Shaw, J. G., & Myatt, J. F. Full-wave and ray-based modeling of cross-beam energy transfer between laser beams with distributed phase plates and polarization smoothing. United States. doi:10.1063/1.4998713.
Follett, R. K., Edgell, D. H., Froula, D. H., Goncharov, V. N., Igumenshchev, I. V., Shaw, J. G., and Myatt, J. F. Fri . "Full-wave and ray-based modeling of cross-beam energy transfer between laser beams with distributed phase plates and polarization smoothing". United States. doi:10.1063/1.4998713. https://www.osti.gov/servlets/purl/1405333.
@article{osti_1405333,
title = {Full-wave and ray-based modeling of cross-beam energy transfer between laser beams with distributed phase plates and polarization smoothing},
author = {Follett, R. K. and Edgell, D. H. and Froula, D. H. and Goncharov, V. N. and Igumenshchev, I. V. and Shaw, J. G. and Myatt, J. F.},
abstractNote = {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%).},
doi = {10.1063/1.4998713},
journal = {Physics of Plasmas},
number = 10,
volume = 24,
place = {United States},
year = {2017},
month = {10}
}

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    Works referencing / citing this record:

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