Unified Concept of Effective One Component Plasma for Hot Dense Plasmas

Clérouin, Jean; Arnault, Philippe; Ticknor, Christopher; Kress, Joel D.; Collins, L. A.

doi:10.1103/physrevlett.116.115003

Cited by 30 publications

(25 citation statements)

References 53 publications

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“…The intrinsic error of the dispersion relation from our analysis of the acoustic mode are increasing for larger k as their full width at half maximaum increases [54] and overlaps largely with the diffusive mode. We therefore obtain only a parallel slope to the free particle limit.…”

Section: Results For the Dynamic Ion Structure Factormentioning

confidence: 78%

Ab initiosimulations of the dynamic ion structure factor of warm dense lithium

et al. 2017

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We present molecular dynamics simulations based on finite-temperature density functional theory that determine self-consistently the dynamic ion structure factor and the electronic form factor in lithium. Our comprehensive data set allows for the calculation of the dispersion relation for collective excitations, the calculation of the sound velocity, and the determination of the ion feature from the total electronic form factor and the ion structure factor. The results are compared with available experimental x-ray and neutron scattering data. Good agreement is found for both the liquid metal and warm dense matter domain. Finally, we study the impact of possible target inhomogeneities on x-ray scattering spectra.

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Section: Results For the Dynamic Ion Structure Factormentioning

confidence: 78%

Ab initiosimulations of the dynamic ion structure factor of warm dense lithium

et al. 2017

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“…The eBIM concept extends the already proposed model of effective OCP and should find further applications in the description of WDM mixtures, such as equations of state and ionic transport coefficients . This approach can also be extended straightforwardly to mixtures of more than two components.…”

Section: Conclusion and Discussionmentioning

confidence: 92%

Enhancement factor of nuclear reactions in partially ionized plasmas and asymmetric mixtures

Arnault

Clérouin

Desbiens

et al. 2019

Contributions to Plasma Physics

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When hydrogen is mixed with heavy (high‐Z) elements, even as traces, such as iron in the sun, the plasma mixture transits from a weakly coupled state to the intermediate coupling regime of simultaneous weak and strong couplings due to charge asymmetry. In those circumstances, partial ionization is an important aspect to consider. We present a global approach for evaluating enhancement factors for thermonuclear reactions in such mixtures. We grounded our approach on extensive orbital free molecular dynamics (OFMD) simulations of hydrogen‐silver mixtures, chosen as a prototype of hydrogen—high‐Z mixtures, in a large range of temperature (100 < T < 1600 eV). By comparing a series of OFMD simulations to hyper‐netted chain calculations of effective binary ionic mixtures (eBIM), we set a general procedure for computing enhancement factors. The electron screening contribution is also included implicitly in the definition of the effective ionizations within the average atom framework. The agreement between the pair distribution functions of OFMD and eBIM validates a prescription in which each average atom representing a given species shares the same external electron density with the others (iso‐ne rule). We checked that an interpolation formula between weak and strong couplings in BIM, due to Chugunov and DeWitt, is accurate enough to address the limit of extreme dilution of a heavy element.

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“…This will include looking at the pair distribu-tion function and the velocity auto correlation functions for such mixtures as concentration changes. It will hold valuable insights into the behavior of such mixtures and how they relate to basic model systems [52].…”

Section: Discussionmentioning

confidence: 99%

Transport properties of an asymmetric mixture in the dense plasma regime

et al. 2016

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We study how concentration changes ionic transport properties along isobars-isotherms for a mixture of hydrogen and silver, representative of turbulent layers relevant to inertial confinement fusion (ICF) and astrophysics. Hydrogen will typically be fully ionized while silver will be only partially ionized but can have a large effective charge. This will lead to very different physical conditions for the H and Ag. Large first principles orbital free molecular dynamics (OFMD) simulations are performed and the resulting transport properties are analyzed. Comparisons are made with transport theory in the kinetic regime and in the coupled regime. The addition of a small amount of heavy element in a light material has a dramatic effect on viscosity and diffusion of the mixture. This effect is explained through kinetic theory as a manifestation of a crossover between classical diffusion and Lorentz diffusion.

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Unified Concept of Effective One Component Plasma for Hot Dense Plasmas

Cited by 30 publications

References 53 publications

Ab initiosimulations of the dynamic ion structure factor of warm dense lithium

Ab initiosimulations of the dynamic ion structure factor of warm dense lithium

Enhancement factor of nuclear reactions in partially ionized plasmas and asymmetric mixtures

Transport properties of an asymmetric mixture in the dense plasma regime

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