Ion kinetic dynamics in strongly-shocked plasmas relevant to ICF

Rinderknecht, H. G.; Amendt, P. A.; Rosenberg, M. J.; Li, C. K.; Frenje, J. A.; Johnson, M. Gatu; Sio, H.; Seguin, F. H.; Petrasso, R. D.; Zylstra, A. B.; Kagan, G.; Hoffman, N. M.; Svyatsky, D.; Wilks, S. C.; Glebov, V. Yu.; Stoeckl, C.; Sangster, T. C.

doi:10.1088/1741-4326/aa69d9

Title: Ion kinetic dynamics in strongly-shocked plasmas relevant to ICF

Journal Article · Thu Apr 20 00:00:00 EDT 2017 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/aa69d9· OSTI ID:1330748

Rinderknecht, H. G. ^[1]; Amendt, P. A. ^[1]; Rosenberg, M. J. ^[2]; Li, C. K. ^[3]; Frenje, J. A. ^[3]; Johnson, M. Gatu ^[3]; Sio, H. ^[3]; Seguin, F. H. ^[3]; Petrasso, R. D. ^[3]; Zylstra, A. B. ^[4]; Kagan, G. ^[4]; Hoffman, N. M. ^[4]; Svyatsky, D. ^[4]; Wilks, S. C. ^[1]; Glebov, V. Yu. ^[2]; Stoeckl, C. ^[2]; Sangster, T. C. ^[2]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of Rochester, Rochester, NY (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Implosions of thin-shell capsules produce strongly-shocked (M > 10), low-density (ρ ~1 mg/cc^-1), high-temperature (T_i ~keV) plasmas, comparable to those produced in the strongly-shocked DT-vapor in inertial confinement fusion (ICF) experiments. A series of thin-glass targets filled with mixtures of deuterium and Helium-3 gas ranging from 7% to 100% deuterium was imploded to investigate the impact of multi-species ion kinetic mechanisms in ICF-relevant plasmas over a wide range of Knudsen numbers (N_K ≡ λ_ii/R). Anomalous trends in nuclear yields and burn-averaged ion temperatures in implosions with N_K > 0.5, which have been interpreted as signatures of ion species separation and ion thermal decoupling, are found not to be consistent with single-species ion kinetic effects alone. Experimentally inferred Knudsen numbers predict an opposite yield trend to those observed, confirming the dominance of multi-species physics in these experiments. In contrast, implosions with N_K ~ 0.01 follow the expected yield trend, suggesting single-species kinetic effects are dominant. In conclusion, the impact of the observed kinetic physics mechanisms on the formation of the hotspot in ICF experiments is discussed.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1330748

Report Number(s):: LLNL-CONF-703328

Journal Information:: Nuclear Fusion, Vol. 57, Issue 6; Conference: 26th IAEA Fusion Energy Conference, Kyoto (Japan), 17-22 Oct 2016; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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Ion species stratification within strong shocks in two-ion plasmas Keenan, Brett D.; Simakov, Andrei N.; Taitano, William T. Physics of Plasmas, Vol. 25, Issue 3 https://doi.org/10.1063/1.5020156	journal	March 2018
Measurements of ion velocity separation and ionization in multi-species plasma shocks Rinderknecht, Hans G.; Park, H. -S.; Ross, J. S. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5023383	journal	May 2018
Kinetic physics in ICF: present understanding and future directions Rinderknecht, Hans G.; Amendt, P. A.; Wilks, S. C. Plasma Physics and Controlled Fusion, Vol. 60, Issue 6 https://doi.org/10.1088/1361-6587/aab79f	journal	April 2018
Ion Species Stratification Within Strong Shocks in Two-Ion Plasmas Keenan, Brett D.; Simakov, Andrei N.; Taitano, William T. arXiv https://doi.org/10.48550/arxiv.1712.08663	text	January 2017

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