Recent progress in microscale modeling of RF sheaths

J. R. Myra, D. Curreli, M. T. Elias, T. G. Jenkins

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The microscale properties of RF sheaths in the ion cyclotron range of frequencies (ICRF) are investigated by means of analytical theory, nonlinear fluid and particle-in-cell (PIC) code modeling. Previous work that parametrized RF sheath properties, specifically the RF sheath impedance and the rectified (DC) sheath potential, is generalized to include the effect of net DC current flow through the sheath. Analytical results are presented in the low frequency limit where the displacement current is negligible, and tested against results from a fluid numerical model. It is shown that when the sheath draws DC electron current, the voltage rectification is reduced from the zero current case, and the electron admittance is increased. In separate but related work on the microscale model, selected cases have been simulated with PIC codes to validate, further illuminate and extend fluid model results and their parametrizations. Quantitative agreement in trends for voltage rectification and sheath admittance vs. RF driving voltage is found.

Original languageEnglish (US)
Title of host publication23rd Topical Conference on Radiofrequency Power in Plasmas
EditorsPaul T. Bonoli, Robert I. Pinsker, Xiaojie Wang
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735420137
DOIs
StatePublished - Sep 16 2020
Event23rd Topical Conference on Radiofrequency Power in Plasmas - Hefei, China
Duration: May 14 2019May 17 2019

Publication series

NameAIP Conference Proceedings
Volume2254
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference23rd Topical Conference on Radiofrequency Power in Plasmas
CountryChina
CityHefei
Period5/14/195/17/19

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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