Journal article
Anisotropic angular scattering models of elastic electron-neutral collisions for Monte Carlo plasma simulations
Plasma sources science & technology, Vol.31(6)
11/06/2022
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Abstract
Many laboratory and industrial plasma applications require accurate modeling techniques to understand the interplay between microscopic and macroscopic processes. A prime example of this interplay is how particle and Monte Carlo (MC) simulation codes describe angular scattering of electrons following elastic scattering events. The forward peaked nature of high energy electron elastic scattering is relatively trivial to accurately describe in plasma simulations. However, for lower energy collisions, which produce near isotropic or backward peaked differential cross sections, there is not a strong consensus among the plasma modeling community on how to best describe these angular scattering trends. In this study, we propose a systematic method to approximate the aforementioned non-trivial angular scattering behavior with a formula that can be readily implemented in particle-in-cell (PIC) and/or MC plasma simulation codes. The present approach is specifically applied to fusion relevant atomic hydrogen and helium, as well as for molecular hydrogen, and results are also applicable to the atomic isotopes and homonuclear molecular isotopologues of these species. Comparisons between the present angular distribution function and benchmark scattering data were used to validate the proposed models. In addition, two-term Boltzmann calculations and PIC direct simulation MC simulations revealed that the proposed angular distribution function is accurate, agreeing very well with benchmark convergent close-coupling scattering calculations, and electron transport measurements. These studies confirmed that the present angular distribution function model can be utilized without the need of renormalization to the momentum transfer cross section (as opposed to using the elastic scattering integrated cross section), which has been suggested by several studies in order to correct for deficient angular scattering models, and to agree with transport measurements. Hence, the present anisotropic angular scattering model can be utilized to accurately model the momentum transfer as well as the electron trajectories of elastic collisions.
Details
- Title
- Anisotropic angular scattering models of elastic electron-neutral collisions for Monte Carlo plasma simulations
- Creators
- Ryan M Park - Tulane University Tulane Department of Chemical and Biomolecular Engineering, New Orleans, LA 70118, United States of AmericaWillem Kupets - Los Alamos National Laboratory Theoretical Division, Los Alamos, NM 87545, United States of AmericaMark C Zammit - Los Alamos National LaboratoryJames Colgan - Los Alamos National LaboratoryChristopher J Fontes - Los Alamos National LaboratoryBrett S Scheiner - Los Alamos National Laboratory Computational Physics Division, Los Alamos, NM 87545, United States of AmericaEddy Timmermans - Los Alamos National Laboratory Computational Physics Division, Los Alamos, NM 87545, United States of AmericaXian-Zhu Tang - Los Alamos National LaboratoryLiam H Scarlett - Curtin University Curtin Institute for Computation and Department of Physics and Astronomy, Perth, Western Australia 6102, AustraliaDmitry V Fursa - Curtin University Curtin Institute for Computation and Department of Physics and Astronomy, Perth, Western Australia 6102, AustraliaIgor Bray - Curtin University Curtin Institute for Computation and Department of Physics and Astronomy, Perth, Western Australia 6102, AustraliaNathan A Garland - Griffith University
- Publication Details
- Plasma sources science & technology, Vol.31(6)
- Publisher
- IOP Publishing
- Number of pages
- 16
- Grant note
- 89233218NCA000001 / National Nuclear Security Administration of the U.S. Department of Energy Los Alamos National Laboratory (LANL) Australian Government (https://doi.org/10.13039/100015539) LANL’s ASC PEM Atomic Physics Project 20200356ER / Laboratory Directed Research and Development (https://doi.org/10.13039/100007000) United States Air Force Curtin University
- Identifiers
- 991013054709902368
- Academic Unit
- Faculty of Science and Engineering
- Language
- English
- Resource Type
- Journal article