[Seminar] Szemináriumok - Seminars: Donkó Zoltán

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SZFI SzemináriumDonkó ZoltánMTA Wigner FK SZFIMany-body effects in charged particle transport – the Coulomb logarithm and beyond2019. október 15. kedd, 10.00, KFKI Telephely, I. épület 1. emeleti TanácsteremCoulomb collisions, at appreciable ratios of the electron to the neutral particle density, influence significantly the electron kinetics in particle swarms and in plasmas of gas discharges. In [1] a combination of Molecular Dynamics and Monte Carlo simulation techniques was introduced that provides a novel, approximation-free, first-principles calculation method for the velocity distribution function of electrons, and related swarm characteristics, at arbitrary degree of ionisation. In comparison with the solution of the Boltzmann transport equation this method was used in studies of the bistable solutions of the electron energy distribution function [2], as well as of negative differential conductivity and transient negative mobility effects in electron transport [3]. In our recent studies, we proposed a modification, due to electron – neutral collisions, of the classical Coulomb logarithm that enters the collision terms of the Boltzmann equation [4] and have shown that Boltzmann transport calculations using this modified Coulomb logarithm are in excellent agreement with those obtained from first-principles simulations that account for the many-body effects during the charged particle transport.[1] Z. Donkó: "First principles calculation of the effect of Coulomb collisions in partially ionized gases", Physics of Plasmas. 21, 43504 (2014).[2] N. Dyatko and Z. Donkó: "Bistable solutions for the electron energy distribution function in electron swarms in xenon: a comparison between the results of first-principles particle simulations and conventional Boltzmann equation analysis", Plasma Sources Sci. Technol. 24, 45002 (2015).[3] Z. Donkó and N. Dyatko: "First-principles particle simulation and Boltzmann equation analysis of negative differential conductivity and transient negative mobility effects in xenon", Eur. Phys. J. D 70, 135 (2016).[4] G. J. M. Hagelaar, Z. Donkó, N. Dyatko: "Modification of the Coulomb Logarithm due to Electron-Neutral Collisions", Phys. Rev. Lett. 123, 025004 (2019).   Minden érdeklődőt szívesen látunk! - Everyone is welcome to attend.Juhász Róbertszfi-seminar at wigner.mta.hu
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