Ion species stratification within strong shocks in two-ion plasmas

Keenan, Brett D.; Simakov, Andrei N.; Taitano, William T.; Chacón, Luis

doi:10.1063/1.5020156

Title: Ion species stratification within strong shocks in two-ion plasmas

Journal Article · Thu Mar 01 00:00:00 EST 2018 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5020156· OSTI ID:1427387

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Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

We report strong collisional shocks in multi-ion plasmas are featured in many environments, with Inertial Confinement Fusion (ICF) experiments being one prominent example. Recent work [Keenan et al., Phys. Rev. E 96, 053203 (2017)] answered in detail a number of outstanding questions concerning the kinetic structure of steady-state, planar plasma shocks, e.g., the shock width scaling by the Mach number, M. However, it did not discuss shock-driven ion-species stratification (e.g., relative concentration modification and temperature separation). These are important effects since many recent ICF experiments have evaded explanation by standard, single-fluid, radiation-hydrodynamic (rad-hydro) numerical simulations, and shock-driven fuel stratification likely contributes to this discrepancy. Employing the state-of-the-art Vlasov-Fokker-Planck code, iFP, along with multi-ion hydro simulations and semi-analytics, we quantify the ion stratification by planar shocks with the arbitrary Mach number and the relative species concentration for two-ion plasmas in terms of ion mass and charge ratios. In particular, for strong shocks, we find that the structure of the ion temperature separation has a nearly universal character across ion mass and charge ratios. Lastly, we find that the shock fronts are enriched with the lighter ion species and the enrichment scales as M⁴ for M»1.

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

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1427387

Alternate ID(s):: OSTI ID: 1423399

Report Number(s):: LA-UR-17-31485; TRN: US1802459

Journal Information:: Physics of Plasmas, Vol. 25, Issue 3; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 24 works

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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
Yield degradation in inertial-confinement-fusion implosions due to shock-driven kinetic fuel-species stratification and viscous heating Taitano, W. T.; Simakov, A. N.; Chacón, L. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5024402	journal	May 2018
Diffusion-driven fluid dynamics in ideal gases and plasmas Vold, E. L.; Yin, L.; Taitano, W. Physics of Plasmas, Vol. 25, Issue 6 https://doi.org/10.1063/1.5029932	journal	June 2018
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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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Experimental Measurements of Ion Heating in Collisional Plasma Shocks and Interpenetrating Supersonic Plasma Flows Langendorf, Samuel J.; Yates, Kevin C.; Hsu, Scott C. arXiv https://doi.org/10.48550/arxiv.1805.09933	text	January 2018
Effect of a weak ion collisionality on the dynamics of kinetic electrostatic shocks Sundström, Andréas; Juno, James; TenBarge, Jason M. arXiv https://doi.org/10.48550/arxiv.1810.02128	text	January 2018

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