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

被引：13

作者：

Johnson, M. Gatu ^{[1
]}

Haines, B. M. ^{[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
]}

Seguin, F. H. ^{[1
]}

Stoeckl, C. ^{[3
]}

Petrasso, R. D. ^{[1
]}

机构：

[1] MIT, 77 Massachusetts Ave, Cambridge, MA 02139 USA

[2] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[3] Univ Rochester, Lab Laser Energet, Rochester, NY 14623 USA

来源：

HIGH ENERGY DENSITY PHYSICS | 2020年 / 36卷

关键词：

Inertial confinement fusion; Low-mode asymmetry; Radiation-hydrodynamic simulations; Neutron spectrometry;

D O I：

10.1016/j.hedp.2020.100825

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

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. 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. The results clearly demonstrate the importance of considering all asymmetry sources when interpreting measured signatures of asymmetry.

引用

页数：8

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