Impact of stalk on directly driven inertial confinement fusion implosions

Gatu Johnson, M.; Adrian, P. J.; Anderson, K. S.; Appelbe, B. D.; Chittenden, J. P.; Crilly, A. J.; Edgell, D.; Forrest, C. J.; Frenje, J. A.; Glebov, V. Yu.; Haines, B. M.; Igumenshchev, I.; Jacobs-Perkins, D.; Janezic, R.; Kabadi, N. V.; Knauer, J. P.; Lahmann, B.; Mannion, O. M.; Marshall, F. J.; Michel, T.; Séguin, F. H.; Shah, R.; Stoeckl, C.; Walsh, C. A.; Petrasso, R. D.

doi:10.1063/1.5141607

Impact of stalk on directly driven inertial confinement fusion implosions

Journal Article · Tue Mar 10 00:00:00 EDT 2020 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5141607· OSTI ID:1630873

^[1]; ^[1]; Anderson, K. S. ^[2]; Appelbe, B. D. ^[3]; Chittenden, J. P. ^[3]; Crilly, A. J. ^[3]; Edgell, D. ^[2]; Forrest, C. J. ^[2]; ^[1]; ^[2]; ^[4]; Igumenshchev, I. ^[2]; ^[2]; Janezic, R. ^[2]; Kabadi, N. V. ^[1]; Knauer, J. P. ^[2]; Lahmann, B. ^[1]; ^[2]; Marshall, F. J. ^[2]; ^[2] more »

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Univ. of Rochester, NY (United States)
Imperial College, London (United Kingdom)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Low-mode asymmetries have emerged as one of the primary challenges to achieving high-performing inertial confinement fusion (ICF) implosions. In direct-drive ICF, an important potential seed of such asymmetries is the capsule stalk mount, the impact of which has remained a contentious question. In this paper, we describe the results from an experiment on the OMEGA laser with intentional offsets at varying angles to the capsule stalk mount, which clearly demonstrates the impact of the stalk mount on implosion dynamics. The angle between stalk and offset is found to significantly impact observables. Specifically, a larger directional flow is observed in neutron spectrum measurements when the offset is toward rather than away from the stalk, while an offset at 42° to the stalk gives minimal directional flow but still generates a large flow field in the implosion. No significant directional flow is seen due to stalk only. Time-integrated x-ray images support these flow observations. A trend is also seen in implosion yield, with lower yield obtained for offsets with a smaller angle than with a larger angle toward the stalk. Radiation hydrodynamic simulations using 2D DRACO and 2D/3D Chimera not including the stalk mount and using 2D xRAGE including the stalk mount are brought to bear on the data. The yield trend, the minimal directional flow with stalk only, and the larger flow enhancement observed with the offset toward the stalk are all reproduced in the xRAGE simulations. Finally, the results strongly indicate that the stalk impact must be considered and mitigated to achieve high-performing implosions.

View Accepted Manuscript (DOE)

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

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

Grant/Contract Number:: 89233218CNA000001; NA0003868; NA0002949; NA0002726

OSTI ID:: 1630873

Alternate ID(s):: OSTI ID: 1603819

Report Number(s):: LA-UR--19-32107

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 3 Vol. 27; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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