Impact of asymmetries on fuel performance in inertial confinement fusion

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

doi:10.1103/physreve.98.051201

Impact of asymmetries on fuel performance in inertial confinement fusion

Journal Article · Sun Nov 04 23:00:00 EST 2018 · Physical Review. E

DOI:https://doi.org/10.1103/physreve.98.051201· OSTI ID:1895613

Gatu Johnson, M. ^[1]; Appelbe, B. D. ^[2]; Chittenden, J. P. ^[2]; Delettrez, J. ^[3]; Forrest, C. ^[3]; Frenje, J. A. ^[4]; Glebov, V. Yu. ^[3]; Grimble, W. ^[3]; Haines, B. M. ^[5]; Igumenshchev, I. ^[3]; Janezic, R. ^[3]; Knauer, J. P. ^[3]; Lahmann, B. ^[4]; Marshall, F. J. ^[3]; Michel, T. ^[3]; Séguin, F. H. ^[4]; Stoeckl, C. ^[3]; Walsh, C. ^[2]; Zylstra, A. B. ^[5]; Petrasso, R. D. ^[4]

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

Low-mode asymmetries prevent effective compression, confinement, and heating of the fuel in inertial confinement fusion (ICF) implosions, and their control is essential to achieving ignition. Ion temperatures (T_ion) in ICF experiments are inferred from the broadening of primary neutron spectra. Directional motion (flow) of the fuel at burn also impacts broadening and will lead to artificially inflated “T_ion” values. Flow due to low-mode asymmetries is expected to give rise to line-of-sight variations in measured T_ion. Here we report on intentionally asymmetrically driven experiments at the OMEGA laser facility designed to test the ability to accurately predict and measure line-of-sight differences in apparent T_ion due to low-mode asymmetry-seeded flows. Contrasted to chimera and xrage simulations, the measurements demonstrate how all asymmetry seeds have to be considered to fully capture the flow field in an implosion. In particular, flow induced by the stalk that holds the target is found to interfere with the seeded asymmetry. A substantial stalk-seeded asymmetry in the areal density of the implosion is also observed.

View Accepted Manuscript (DOE)

Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center; Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

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

Grant/Contract Number:: NA0002949; NA0002726; AC52-06NA25396

OSTI ID:: 1895613

Alternate ID(s):: OSTI ID: 1480896

Journal Information:: Physical Review. E, Journal Name: Physical Review. E Journal Issue: 5 Vol. 98; ISSN 2470-0045

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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