Plasma kinetic effects on interfacial mix and burn rates in multispatial dimensions
| العنوان: | Plasma kinetic effects on interfacial mix and burn rates in multispatial dimensions |
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| المؤلفون: | Kevin J. Bowers, Erik Vold, Lin Yin, W. D. Nystrom, Brian J. Albright, Robert Bird |
| المصدر: | Physics of Plasmas. 26:062302 |
| بيانات النشر: | AIP Publishing, 2019. |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | Physics, Plasma, Condensed Matter Physics, Kinetic energy, 01 natural sciences, Instability, Molecular physics, 010305 fluids & plasmas, Atwood number, Physics::Plasma Physics, 0103 physical sciences, Nuclear fusion, Total pressure, 010306 general physics, Inertial confinement fusion, Scaling |
| الوصف: | The physics of mixing in plasmas is of fundamental importance to inertial confinement fusion and high energy density laboratory experiments. Two- and three-dimensional (2D and 3D) particle-in-cell simulations with a binary collision model are used to explore kinetic effects arising during the mixing of plasma media. The applicability of the one-dimensional (1D) ambipolarity condition is evaluated in 2D and 3D simulations of a plasma interface with a sinusoidal perturbation. The 1D ambipolarity condition is found to remain valid in 2D and 3D, as electrons and ions flow together required for J = 0. Simulations of perturbed interfaces show that diffusion-induced total pressure imbalance and hydroflows flatten fine interface structures and drive rapid atomic mix. The atomic mix rate from a structured interface is faster than the ∼ t scaling obtained from 1D theory in the small-Knudsen-number limit. Plasma kinetic effects inhibit the growth of the Rayleigh-Taylor instability at small wavelengths and result in a nonmonotonic growth rate scaling with wavenumber k with a maximum at a low k value, much different from Agk (where A is the Atwood number and g is the gravitational constant) as expected in the absence of plasma kinetic effects. Simulations under plasma conditions relevant to MARBLE separated-reactant experiments on Omega and the NIF show kinetic modification of DT fusion reaction rates. With non-Maxwellian distributions and relative drifts between D and T ions, DT reactivity is higher than that inferred from rates using stationary Maxwellian distributions. Reactivity is also found to be reduced in the presence of finite-Knudsen-layer losses. |
| تدمد: | 1089-7674 1070-664X |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::82f7b261fa266fa1128468218d01176b https://doi.org/10.1063/1.5109257 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi...........82f7b261fa266fa1128468218d01176b |
| قاعدة البيانات: | OpenAIRE |
Find this article in full text from Scitation. | تدمد: | 10897674 1070664X |
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