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. Here, comparison of simulations to multiple complementary experimental observables indicates the addition of CBET physics in offset simulations is necessary to match experimental results.
Anderson, K. S., et al. "Effect of cross-beam energy transfer on target-offset asymmetry in direct-drive inertial confinement fusion implosions." Physics of Plasmas, vol. 27, no. 11, Nov. 2020. https://doi.org/10.1063/5.0015781
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. (2020). Effect of cross-beam energy transfer on target-offset asymmetry in direct-drive inertial confinement fusion implosions. Physics of Plasmas, 27(11). https://doi.org/10.1063/5.0015781
Anderson, K. S., Forrest, C. J., Mannion, O. M., et al., "Effect of cross-beam energy transfer on target-offset asymmetry in direct-drive inertial confinement fusion implosions," Physics of Plasmas 27, no. 11 (2020), https://doi.org/10.1063/5.0015781
@article{osti_1717845,
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 others},
title = {Effect of cross-beam energy transfer on target-offset asymmetry in direct-drive inertial confinement fusion implosions},
annote = {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. Here, comparison of simulations to multiple complementary experimental observables indicates the addition of CBET physics in offset simulations is necessary to match experimental results.},
doi = {10.1063/5.0015781},
url = {https://www.osti.gov/biblio/1717845},
journal = {Physics of Plasmas},
issn = {ISSN 1070-664X},
number = {11},
volume = {27},
place = {United States},
publisher = {American Institute of Physics (AIP)},
year = {2020},
month = {11}}
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 964https://doi.org/10.1016/j.nima.2020.163774
Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, Vol. 201, Issue 1065, p. 192-196https://doi.org/10.1098/rspa.1950.0052