3D xRAGE simulation of inertial confinement fusion implosion with imposed mode 2 laser drive asymmetry

Gatu Johnson, M.; Haines, B. M.; Adrian, P. J.; Forrest, C.; Frenje, J. A.; Glebov, V. Yu.; Grimble, W.; Janezic, R.; Knauer, J. P.; Lahmann, B.; Marshall, F. J.; Michel, T.; Séguin, F. H.; Stoeckl, C.; Petrasso, R. D.

doi:10.1016/j.hedp.2020.100825

Title: 3D xRAGE simulation of inertial confinement fusion implosion with imposed mode 2 laser drive asymmetry

Journal Article · Fri May 22 00:00:00 EDT 2020 · High Energy Density Physics

DOI:https://doi.org/10.1016/j.hedp.2020.100825· OSTI ID:1669089

Gatu Johnson, M. ^[1];

^[2]; Adrian, P. J. ^[1]; Forrest, C. ^[3]; Frenje, J. A. ^[1]; Glebov, V. Yu. ^[3]; Grimble, W. ^[3]; Janezic, R. ^[3]; Knauer, J. P. ^[3]; Lahmann, B. ^[1]; Marshall, F. J. ^[3]; Michel, T. ^[3]; Séguin, F. H. ^[1]; Stoeckl, C. ^[3]; Petrasso, R. D. ^[1]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of Rochester, NY (United States). Lab. for Laser Energetics

Low-mode asymmetries represent an important obstacle to achieving high-gain inertial confinement fusion implosions. As a step in learning how to control such effects, an OMEGA experiment with imposed mode 2 laser drive asymmetries was done to study the expected signatures of this type of asymmetry [M. Gatu Johnson et al., PRE 2018]. In the present work, a 3D xRAGE simulation including the stalk mount has been brought to bear on the data from that experiment. Furthermore, comprehensive comparisons between simulated and measured observables are made. Good agreement between simulated and measured x-ray image-inferred shell trajectories, bang times and neutron emission widths are seen, showing that the hydrodynamics are well captured in the simulation. Asymmetries seen in simulated and measured time-resolved and time-integrated x-ray images and areal densities also compare well, showing impact of both stalk and mode 2. On the other hand, important differences in measured and simulated neutron emission histories, yield, and ion temperature (T_ion) asymmetries are seen, suggesting that the simulation is overestimating shock yield. Overall, the results clearly demonstrate the importance of considering all asymmetry sources when interpreting measured signatures of asymmetry.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

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

Grant/Contract Number:: 89233218CNA000001; NA0002949; NA0003868; NA0003938; 417532-G

OSTI ID:: 1669089

Alternate ID(s):: OSTI ID: 1780441

Report Number(s):: LA-UR-19-32706; TRN: US2203806

Journal Information:: High Energy Density Physics, Vol. 36; ISSN 1574-1818

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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