Ion Thermal Decoupling and Species Separation in Shock-Driven Implosions

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

doi:10.1103/PhysRevLett.114.025001

Title: Ion Thermal Decoupling and Species Separation in Shock-Driven Implosions

Journal Article · Wed Jan 14 00:00:00 EST 2015 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.114.025001· OSTI ID:1172519

Rinderknecht, Hans G. ^[1]; Rosenberg, M. J. ^[1]; Li, C. K. ^[1]; Hoffman, N. M. ^[2]; Kagan, G. ^[2]; Zylstra, A. B. ^[1]; Sio, H. ^[1]; Johnson, M. Gatu ^[1]; Seguin, F. H. ^[1]; Petrasso, R. D. ^[1]; Amendt, P. ^[3]; Bellei, C. ^[3]; Wilks, S. ^[3]; Delettrez, J. ^[4]; Glebov, V. Yu. ^[4]; Stoeckl, C. ^[4]; Sangster, T. C. ^[4]; Meyerhofer, D. D. ^[4]; Nikroo, A. ^[5]

MIT (Massachusetts Inst. of Technology), Cambridge, MA (United States). Plasma Science and Fusion Center
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Lab. for Laser Energetics, Rochester, NY (United States)
General Atomics, San Diego, CA (United States)

Here, anomalous reduction of the fusion yields by 50% and anomalous scaling of the burn-averaged ion temperatures with the ion-species fraction has been observed for the first time in D³He-filled shock-driven inertial confinement fusion implosions. Two ion kinetic mechanisms are used to explain the anomalous observations: thermal decoupling of the D and ³He populations and diffusive species separation. The observed insensitivity of ion temperature to a varying deuterium fraction is shown to be a signature of ion thermal decoupling in shock-heated plasmas. The burn-averaged deuterium fraction calculated from the experimental data demonstrates a reduction in the average core deuterium density, as predicted by simulations that use a diffusion model. Accounting for each of these effects in simulations reproduces the observed yield trends.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center; Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

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

Grant/Contract Number:: NA0002035; NA0001857; B600100; 415023-G; 415935-G; AC52-07NA27344

OSTI ID:: 1172519

Alternate ID(s):: OSTI ID: 1181154; OSTI ID: 1256450

Report Number(s):: LLNL-JRNL-685666; PRLTAO; ArticleNumber: 025001

Journal Information:: Physical Review Letters, Vol. 114, Issue 2; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 62 works

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