Effect of cross-beam energy transfer on target-offset asymmetry in direct-drive inertial confinement fusion implosions
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20ja076_full.pdf
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Author(s)
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.
Date Issued
May 2020
Journal
Physics of Plasmas
Publisher
AIP
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.
Description
Submitted for publication in Physics of Plasmas
MIT Department
Massachusetts Institute of Technology. Plasma Science and Fusion Center
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1063/5.0015781
