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Title: Effect of cross-beam energy transfer on target-offset asymmetry in direct-drive inertial confinement fusion implosions

Abstract

The unintentional mispositioning of inertial confinement fusion (ICF) capsules from the center of laser beam convergence has long been shown in simulations to generate large ℓ = 1 asymmetry and significantly degrade implosion symmetry and fusion yields. Experimental yields on the OMEGA Laser System, however, have shown much less sensitivity to this initial target offset. This paper presents simulations of offset ICF implosions improved by including a physics model of cross-beam energy transfer (CBET), a mechanism of laser energy scattering from one beam to another. Room-temperature OMEGA implosion experiments with prescribed target offsets are simulated with and without CBET, illustrating that CBET mitigates the ℓ = 1 implosion asymmetry from target offset. Comparison of simulations to multiple complementary experimental observables indicates the addition of CBET physics in offset simulations is necessary to match experimental results.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
DOE Contract Number:  
NA0003856
Research Org.:
Univ. of Rochester, NY (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1887424
DOI:
https://doi.org/10.7910/DVN/FQQP9I

Citation Formats

Anderson, K. S., Forrest, C. J., Mannion, O. M., Marshall, F. J., Shah, R. C., Michel, D. T., Marozas, J. A., Radha, P. B., Edgell, D. H., Epstein, R., Goncharov, V. N., Knauer, J. P., Johnson, M. Gatu, and Laffite, S. Effect of cross-beam energy transfer on target-offset asymmetry in direct-drive inertial confinement fusion implosions. United States: N. p., 2021. Web. doi:10.7910/DVN/FQQP9I.
Anderson, K. S., Forrest, C. J., Mannion, O. M., Marshall, F. J., Shah, R. C., Michel, D. T., Marozas, J. A., Radha, P. B., Edgell, D. H., Epstein, R., Goncharov, V. N., Knauer, J. P., Johnson, M. Gatu, & Laffite, S. Effect of cross-beam energy transfer on target-offset asymmetry in direct-drive inertial confinement fusion implosions. United States. doi:https://doi.org/10.7910/DVN/FQQP9I
Anderson, K. S., Forrest, C. J., Mannion, O. M., Marshall, F. J., Shah, R. C., Michel, D. T., Marozas, J. A., Radha, P. B., Edgell, D. H., Epstein, R., Goncharov, V. N., Knauer, J. P., Johnson, M. Gatu, and Laffite, S. 2021. "Effect of cross-beam energy transfer on target-offset asymmetry in direct-drive inertial confinement fusion implosions". United States. doi:https://doi.org/10.7910/DVN/FQQP9I. https://www.osti.gov/servlets/purl/1887424. Pub date:Fri Jun 25 00:00:00 EDT 2021
@article{osti_1887424,
title = {Effect of cross-beam energy transfer on target-offset asymmetry in direct-drive inertial confinement fusion implosions},
author = {Anderson, K. S. and Forrest, C. J. and Mannion, O. M. and Marshall, F. J. and Shah, R. C. and Michel, D. T. and Marozas, J. A. and Radha, P. B. and Edgell, D. H. and Epstein, R. and Goncharov, V. N. and Knauer, J. P. and Johnson, M. Gatu and Laffite, S.},
abstractNote = {The unintentional mispositioning of inertial confinement fusion (ICF) capsules from the center of laser beam convergence has long been shown in simulations to generate large ℓ = 1 asymmetry and significantly degrade implosion symmetry and fusion yields. Experimental yields on the OMEGA Laser System, however, have shown much less sensitivity to this initial target offset. This paper presents simulations of offset ICF implosions improved by including a physics model of cross-beam energy transfer (CBET), a mechanism of laser energy scattering from one beam to another. Room-temperature OMEGA implosion experiments with prescribed target offsets are simulated with and without CBET, illustrating that CBET mitigates the ℓ = 1 implosion asymmetry from target offset. Comparison of simulations to multiple complementary experimental observables indicates the addition of CBET physics in offset simulations is necessary to match experimental results.},
doi = {10.7910/DVN/FQQP9I},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2021},
month = {6}
}

Works referencing / citing this record:

Effect of cross-beam energy transfer on target-offset asymmetry in direct-drive inertial confinement fusion implosions
journal, November 2020