Radio frequency wave interactions with a plasma sheath: The role of wave and plasma sheath impedances

Myra, J. R.; Kohno, H.

doi:10.1063/1.5088343

Radio frequency wave interactions with a plasma sheath: The role of wave and plasma sheath impedances

Journal Article · Wed May 08 00:00:00 EDT 2019 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5088343· OSTI ID:1511451

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Lodestar Research Corporation, Boulder, CO (United States); Lodestar Research Corporation
Kyushu Inst. of Technology, Iizuka (Japan). Dept. of Mechanical Information Science and Technology

Radio frequency (RF) sheaths form near surfaces where plasma and strong RF fields coexist. The effect of these RF sheaths on wave propagation near the boundary can be characterized by an effective sheath impedance that includes both resistive and capacitive contributions describing RF sheath rectification and RF power absorption in the sheath [J. R. Myra and D. A. D'Ippolito, Phys. Plasmas 22, 062507 (2015)]. We define a dimensionless parameter, the ratio of incoming wave impedance to the sheath impedance, which determines the characteristics of the interaction, ranging from quasi-conducting to quasi-insulating, or in the case of matched impedances, to either perfect absorption or a sheath-plasma resonance. A semi-analytical analysis is carried out for electrostatic slow waves in the ion cyclotron range of frequencies. For the propagating slow wave case, where the incident wave is partially reflected, the fraction of power dissipated in the sheath is calculated. For the evanescent slow wave case, which admits a sheath-plasma resonance, an amplification factor is calculated. Using the impedance ratio approach, RF sheath interactions are characterized for a range of RF wave and plasma parameters including plasma density, magnetic field angle with respect to the surface, wave frequency, and wave-vector components tangent to the surface. For a particularly interesting example case, results are compared with the rfSOL code [H. Kohno and J. R. Myra, Comput. Phys. Commun. 220, 129 (2017)]. Finally, electromagnetic effects, absent from the semi-analytical analysis, are assessed.

View Accepted Manuscript (DOE)

Research Organization:: Kyushu Inst. of Technology, Iizuka (Japan); Lodestar Research Corporation, Boulder, CO (United States)

Sponsoring Organization:: Japan Society for the Promotion of Science (JSPS); USDOE; USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

Grant/Contract Number:: AC02-05CH11231; AC05-00OR22725; FG02-97ER54392

OSTI ID:: 1511451

Alternate ID(s):: OSTI ID: 1511525

Report Number(s):: LRC--19-179; DE-FG02-97ER54392; JP16K18336; DE-AC02-05CH11231

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 26; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Calculation of RF sheath properties from surface wave-fields: a post-processing method Myra, J. R.; Kohno, H. Plasma Physics and Controlled Fusion, Vol. 61, Issue 9 https://doi.org/10.1088/1361-6587/ab2f41	journal	July 2019

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