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17–22 Oct 2016
Kyoto International Conference Center
Japan timezone

Ion Kinetic Dynamics in Strongly-Shocked Plasmas Relevant to ICF

21 Oct 2016, 08:30
4h
Kyoto International Conference Center

Kyoto International Conference Center

Takaragaike, Sakyo-ku, Kyoto 606-0001 Japan
Poster IFE - Inertial Fusion Experiments and Theory Poster EX/9, EX/10, TH/7, TH/8, IFE/1, MPT/1, FNS/1

Speaker

Hans Rinderknecht (Lawrence Livermore National Laboratory)

Description

Implosions of thin-shell capsules produce strongly-shocked (M > 10), low-density (ρ ~ 1 mg/cc), high-temperature (Ti ~ keV) plasmas, comparable to those produced in the strongly-shocked DT-vapor in inertial confinement fusion (ICF) experiments. A series of thin-glass targets was filled with mixtures of deuterium and Helium-3 gas ranging from 20% to 100% deuterium and imploded on the OMEGA laser at the Laboratory for Laser Energetics to investigate the impact of multi-species ion kinetic mechanisms on ICF-relevant plasmas. Anomalous trends in nuclear yields and burn-averaged ion temperatures, which have been interpreted as signatures of ion species separation and ion thermal decoupling [H. G. Rinderknecht et al., Phys. Rev. Lett. 114, 025001 (2015)], are found not to be consistent with single-species ion kinetic effects alone. Experimentally-inferred Knudsen numbers predict an opposite yield and temperature trend to those observed, confirming the dominance of multi-species physics in these experiments. Ion density is inferred to be half of the predicted value: models of undercompression and loss of ions at the fuel/ablator interface are considered. The impact of the observed kinetic physics mechanisms on the formation of the hotspot in ICF experiments is discussed.
Country or International Organization USA
Paper Number IFE/1-5

Primary author

Hans Rinderknecht (Lawrence Livermore National Laboratory)

Presentation materials

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