skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

This content will become publicly available on July 23, 2020

Title: Calculation of RF sheath properties from surface wave-fields: a post-processing method

Abstract

In ion cyclotron range of frequency (ICRF) experiments in fusion research devices, radio frequency (RF) sheaths form where plasma, strong RF wave fields and material surfaces coexist. These RF sheaths affect plasma material interactions such as sputtering and localized power deposition, as well as the global RF wave fields themselves. RF sheaths may be modeled by employing a sheath boundary condition (BC) in place of the more customary conducting wall BC; however, there are still many ICRF computer codes that do not implement the sheath BC. In this paper we present a method for post-processing results obtained with the conducting wall BC. The post-processing method produces results that are equivalent to those that would have been obtained with the RF sheath BC, under certain assumptions. We found the post-processing method is also useful for verification of sheath BC implementations and as a guide to interpretation and understanding of the role of RF sheaths and their interactions with the waves that drive them.

Authors:
ORCiD logo [1]; ORCiD logo [2]
  1. Lodestar Research Corporation, Boulder, CO (United States)
  2. Kyushu Inst. of Technology, Iizuka, Fukuoka (Japan)
Publication Date:
Research Org.:
Lodestar Research Corp., Boulder, CO (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Univ. of California, Oakland, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24); Japan Society for the Promotion of Science (JSPS); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division
OSTI Identifier:
1593817
Report Number(s):
[ORNL-4000158507-3; DOE-ER-54392-94; LRC-19-180]
[Journal ID: ISSN 0741-3335; LRC-19-180]
Grant/Contract Number:  
[AC05-00OR22725; JP16K18336; AC02- 05CH11231]
Resource Type:
Accepted Manuscript
Journal Name:
Plasma Physics and Controlled Fusion
Additional Journal Information:
[ Journal Volume: 61; Journal Issue: 9; Related Information: http://doi.org/10.5281/zenodo.3255075]; Journal ID: ISSN 0741-3335
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; plasma; radio frequency; ICRF; sheath; tokamak

Citation Formats

Myra, J. R., and Kohno, H. Calculation of RF sheath properties from surface wave-fields: a post-processing method. United States: N. p., 2019. Web. doi:10.1088/1361-6587/ab2f41.
Myra, J. R., & Kohno, H. Calculation of RF sheath properties from surface wave-fields: a post-processing method. United States. doi:10.1088/1361-6587/ab2f41.
Myra, J. R., and Kohno, H. Tue . "Calculation of RF sheath properties from surface wave-fields: a post-processing method". United States. doi:10.1088/1361-6587/ab2f41.
@article{osti_1593817,
title = {Calculation of RF sheath properties from surface wave-fields: a post-processing method},
author = {Myra, J. R. and Kohno, H.},
abstractNote = {In ion cyclotron range of frequency (ICRF) experiments in fusion research devices, radio frequency (RF) sheaths form where plasma, strong RF wave fields and material surfaces coexist. These RF sheaths affect plasma material interactions such as sputtering and localized power deposition, as well as the global RF wave fields themselves. RF sheaths may be modeled by employing a sheath boundary condition (BC) in place of the more customary conducting wall BC; however, there are still many ICRF computer codes that do not implement the sheath BC. In this paper we present a method for post-processing results obtained with the conducting wall BC. The post-processing method produces results that are equivalent to those that would have been obtained with the RF sheath BC, under certain assumptions. We found the post-processing method is also useful for verification of sheath BC implementations and as a guide to interpretation and understanding of the role of RF sheaths and their interactions with the waves that drive them.},
doi = {10.1088/1361-6587/ab2f41},
journal = {Plasma Physics and Controlled Fusion},
number = [9],
volume = [61],
place = {United States},
year = {2019},
month = {7}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on July 23, 2020
Publisher's Version of Record

Save / Share:

Works referenced in this record:

Characterization of SOL plasma flows and potentials in ICRF-heated plasmas in Alcator C-mod
journal, August 2017

  • Hong, R.; Wukitch, S. J.; Lin, Y.
  • Plasma Physics and Controlled Fusion, Vol. 59, Issue 10
  • DOI: 10.1088/1361-6587/aa7f4b

Experimental Observation of Convective Cell Formation due to a Fast Wave Antenna in the Large Plasma Device
journal, November 2017


Making ICRF power compatible with a high-Z wall in ASDEX Upgrade
journal, October 2016


The role of rectified currents in far-field RF sheaths and in SOL losses of HHFW power on NSTX
journal, August 2017


Radio-frequency sheaths physics: Experimental characterization on Tore Supra and related self-consistent modeling
journal, June 2014

  • Jacquot, Jonathan; Milanesio, Daniele; Colas, Laurent
  • Physics of Plasmas, Vol. 21, Issue 6
  • DOI: 10.1063/1.4884778

Ion cyclotron resonance frequency heating in JET during initial operations with the ITER-like wall
journal, June 2014

  • Jacquet, P.; Bobkov, V.; Colas, L.
  • Physics of Plasmas, Vol. 21, Issue 6
  • DOI: 10.1063/1.4884354

ICRF-enhanced plasma potentials in the SOL of Alcator C-Mod
journal, December 2013


Characterization and performance of a field aligned ion cyclotron range of frequency antenna in Alcator C-Mod
journal, May 2013

  • Wukitch, S. J.; Garrett, M. L.; Ochoukov, R.
  • Physics of Plasmas, Vol. 20, Issue 5
  • DOI: 10.1063/1.4803882

Characterization of heat flux generated by ICRH heating with cantilevered bars and a slotted box Faraday screen
journal, August 2012


The interaction between waves in the ion cyclotron range of frequencies and the plasma boundary
journal, November 1993


Radiofrequency sheaths and impurity generation by ICRF antennas
journal, April 1989


Faraday screen sheaths and impurity production during ion cyclotron heating
journal, May 1990


Radio‐frequency‐sheath‐driven edge plasma convection and interaction with the H mode
journal, October 1993

  • D’Ippolito, D. A.; Myra, J. R.; Jacquinot, J.
  • Physics of Fluids B: Plasma Physics, Vol. 5, Issue 10
  • DOI: 10.1063/1.860832

Edge plasma density convection during ion cyclotron resonance heating on Tore Supra
journal, June 2002

  • Bécoulet, M.; Colas, L.; Pécoul, S.
  • Physics of Plasmas, Vol. 9, Issue 6
  • DOI: 10.1063/1.1472501

Hot spot phenomena on Tore Supra ICRF antennas investigated by optical diagnostics
journal, December 2002


Radio frequency sheaths in an oblique magnetic field
journal, June 2015

  • Myra, J. R.; D'Ippolito, D. A.
  • Physics of Plasmas, Vol. 22, Issue 6
  • DOI: 10.1063/1.4922848

A finite element procedure for radio-frequency sheath–plasma interactions based on a sheath impedance model
journal, November 2017


Quantitative modeling of ICRF antennas with integrated time domain RF sheath and plasma physics
conference, January 2014

  • Smithe, David N.; D'Ippolito, Daniel A.; Myra, James R.
  • RADIOFREQUENCY POWER IN PLASMAS: Proceedings of the 20th Topical Conference, AIP Conference Proceedings
  • DOI: 10.1063/1.4864506

Numerical analysis of radio-frequency sheath-plasma interactions in the ion cyclotron range of frequencies
journal, January 2012

  • Kohno, H.; Myra, J. R.; D’Ippolito, D. A.
  • Physics of Plasmas, Vol. 19, Issue 1
  • DOI: 10.1063/1.3677262

Radio-frequency sheath-plasma interactions with magnetic field tangency points along the sheath surface
journal, August 2013

  • Kohno, H.; Myra, J. R.; D'Ippolito, D. A.
  • Physics of Plasmas, Vol. 20, Issue 8
  • DOI: 10.1063/1.4818991

Spatial proximity effects on the excitation of sheath RF voltages by evanescent slow waves in the ion cyclotron range of frequencies
journal, January 2017


Nonlinear plasma sheath potential in the ASDEX Upgrade 3-strap antenna: a parameter scan
journal, August 2017


Power deposition in high‐density inductively coupled plasma tools for semiconductor processing
journal, June 1995

  • Jaeger, E. F.; Berry, L. A.; Tolliver, J. S.
  • Physics of Plasmas, Vol. 2, Issue 6
  • DOI: 10.1063/1.871222

A radio-frequency sheath boundary condition and its effect on slow wave propagation
journal, October 2006

  • D’Ippolito, D. A.; Myra, J. R.
  • Physics of Plasmas, Vol. 13, Issue 10
  • DOI: 10.1063/1.2360507

Physics-based parametrization of the surface impedance for radio frequency sheaths
journal, July 2017


A post-processing method to simulate the generalized RF sheath boundary condition
journal, January 2017


Radio-frequency wave interactions with a plasma sheath in oblique-angle magnetic fields using a sheath impedance model
journal, February 2019


Plasma Resonance in a Radio-Frequency Probe
journal, September 1960


Instability of the sheath-plasma resonance
journal, February 1988


Radio frequency wave interactions with a plasma sheath: The role of wave and plasma sheath impedances
journal, May 2019