Investigation of ion kinetic effects in direct-drive exploding-pusher implosions at the NIF
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Investigation of Ion Kinetic Effects in Direct-Drive Exploding-Pusher.pdf
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2.22 MB
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Author(s)
Rosenberg, Michael Jonathan
Zylstra, Alex Bennett
Seguin, Fredrick Hampton
Rinderknecht, Hans George
Frenje, Johan A
Gatu Johnson, Maria
Sio, Hong Weng
Waugh, Caleb Joseph
Sinenian, Nareg
Li, C. K.
Date Issued
December 2014
Journal
Physics of Plasmas
Publisher
American Institute of Physics (AIP)
Citation
Rosenberg, M. J. et al. “Investigation of Ion Kinetic Effects in Direct-Drive Exploding-Pusher Implosions at the NIF.” Physics of Plasmas 21, 12 (December 2014): 122712 © 2014 AIP Publishing
Version
Author's final manuscript
Abstract
Measurements of yield, ion temperature, areal density (ρR), shell convergence, and bang time have been obtained in shock-driven, D₂ and D³He gas-filled "exploding-pusher" inertial confinement fusion (ICF) implosions at the National Ignition Facility to assess the impact of ion kinetic effects. These measurements probed the shock convergence phase of ICF implosions, a critical stage in hot-spot ignition experiments. The data complement previous studies of kinetic effects in shock-driven implosions. Ion temperature and fuel ρR inferred from fusion-product spectroscopy are used to estimate the ion-ion mean free path in the gas. A trend of decreasing yields relative to the predictions of 2D draco hydrodynamics simulations with increasing Knudsen number (the ratio of ion-ion mean free path to minimum shell radius) suggests that ion kinetic effects are increasingly impacting the hot fuel region, in general agreement with previous results. The long mean free path conditions giving rise to ion kinetic effects in the gas are often prevalent during the shock phase of both exploding pushers and ablatively driven implosions, including ignition-relevant implosions.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Plasma Science and Fusion Center
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DOI of Published Version
https://doi.org/10.1063/1.4905064
