Observation of interspecies ion separation in inertial-confinement-fusion implosions

Hsu, Scott C.; Joshi, Tirtha Raj; Hakel, Peter; Vold, Erik Lehman; Schmitt, Mark J.; Hoffman, Nelson M.; Rauenzahn, Rick M.; Kagan, Grigory; Tang, Xianzhu; Mancini, Roberto C.; Kim, Yong Ho; Herrmann, Hans W.

doi:10.1209/0295-5075/115/65001

Title: Observation of interspecies ion separation in inertial-confinement-fusion implosions

Journal Article · Mon Oct 24 00:00:00 EDT 2016 · Europhysics Letters

DOI:https://doi.org/10.1209/0295-5075/115/65001· OSTI ID:1340933

^[1]; Joshi, Tirtha Raj ^[1]; Hakel, Peter ^[1]; Vold, Erik Lehman ^[1]; Schmitt, Mark J. ^[1]; Hoffman, Nelson M. ^[1]; Rauenzahn, Rick M. ^[1]; Kagan, Grigory ^[1]; Tang, Xianzhu ^[1]; Mancini, Roberto C. ^[2]; Kim, Yong Ho ^[1]; Herrmann, Hans W. ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of Nevada, Reno, NV (United States). Dept. of Physics

Here we report direct experimental evidence of interspecies ion separation in direct-drive, inertial-confinement-fusion experiments on the OMEGA laser facility. These experiments, which used plastic capsules with D₂/Ar gas fill (1% Ar by atom), were designed specifically to reveal interspecies ion separation by exploiting the predicted, strong ion thermo-diffusion between ion species of large mass and charge difference. Via detailed analyses of imaging x-ray-spectroscopy data, we extract Ar-atom-fraction radial profiles at different times, and observe both enhancement and depletion compared to the initial 1%-Ar gas fill. The experimental results are interpreted with radiation-hydrodynamic simulations that include recently implemented, first-principles models of interspecies ion diffusion. Finally, the experimentally inferred Ar-atom-fraction profiles agree reasonably, but not exactly, with calculated profiles associated with the incoming and rebounding first shock.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

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

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1340933

Report Number(s):: LA-UR-16-23658

Journal Information:: Europhysics Letters, Vol. 115, Issue 6; ISSN 0295-5075

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 19 works

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Progress on observations of interspecies ion separation in inertial-confinement-fusion implosions via imaging x-ray spectroscopy Joshi, T. R.; Hsu, S. C.; Hakel, P. Physics of Plasmas, Vol. 26, Issue 6 https://doi.org/10.1063/1.5092998	journal	June 2019
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Probing ion species separation and ion thermal decoupling in shock-driven implosions using multiple nuclear reaction histories Sio, H.; Larroche, O.; Atzeni, S. Physics of Plasmas, Vol. 26, Issue 7 https://doi.org/10.1063/1.5097605	journal	July 2019
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Self-similar solutions for multi-species plasma mixing by gradient driven transport Vold, E.; Kagan, G.; Simakov, A. N. Plasma Physics and Controlled Fusion, Vol. 60, Issue 5 https://doi.org/10.1088/1361-6587/aab38e	journal	March 2018
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Plasma ion stratification by weak planar shocks Simakov, Andrei N.; Keenan, Brett D.; Taitano, William T. Physics of Plasmas, Vol. 24, Issue 9 https://doi.org/10.1063/1.4995427	journal	September 2017
Multi-species plasma transport in 1D direct-drive ICF simulations Vold, E.; Rauenzahn, R.; Simakov, A. N. Physics of Plasmas, Vol. 26, Issue 3 https://doi.org/10.1063/1.5083157	journal	March 2019

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