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Title: Numerical analysis of radio-frequency sheath-plasma interactions in the ion cyclotron range of frequencies

Abstract

A new finite element numerical scheme for analyzing self-consistent radio-frequency (RF) sheath-plasma interaction problems in the ion cyclotron range of frequencies is applied to various problems represented by simplified models for the tokamak scrape-off layer. The present code incorporates a modified boundary condition, which is called a sheath boundary condition, that couples the radio-frequency waves and sheaths at the material boundaries by treating the sheath as a thin vacuum layer. A series of numerical analyses in one- and two-dimensional domains show several important physical properties, such as the existence of multiple roots, hysteresis effects, presence and characteristics of the sheath-plasma waves, and the phase shift of a reflected slow wave, some of which are newly identified by introducing a spatially varying plasma density and background magnetic field.

Authors:
 [1]; ;  [2]
  1. Plasma Science and Fusion Center, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139 (United States)
  2. Lodestar Research Corporation, 2400 Central Avenue P-5, Boulder, Colorado 80301 (United States)
Publication Date:
OSTI Identifier:
22043584
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 19; Journal Issue: 1; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BOUNDARY CONDITIONS; CONFINEMENT; CYCLOTRONS; HYSTERESIS; INTERACTIONS; IONS; MAGNETIC FIELDS; NUMERICAL ANALYSIS; PHASE SHIFT; PLASMA; PLASMA DENSITY; PLASMA SCRAPE-OFF LAYER; PLASMA SHEATH; PLASMA WAVES; RADIOWAVE RADIATION; TOKAMAK DEVICES

Citation Formats

Kohno, H, Myra, J R, and D'Ippolito, D A. Numerical analysis of radio-frequency sheath-plasma interactions in the ion cyclotron range of frequencies. United States: N. p., 2012. Web. doi:10.1063/1.3677262.
Kohno, H, Myra, J R, & D'Ippolito, D A. Numerical analysis of radio-frequency sheath-plasma interactions in the ion cyclotron range of frequencies. United States. https://doi.org/10.1063/1.3677262
Kohno, H, Myra, J R, and D'Ippolito, D A. Sun . "Numerical analysis of radio-frequency sheath-plasma interactions in the ion cyclotron range of frequencies". United States. https://doi.org/10.1063/1.3677262.
@article{osti_22043584,
title = {Numerical analysis of radio-frequency sheath-plasma interactions in the ion cyclotron range of frequencies},
author = {Kohno, H and Myra, J R and D'Ippolito, D A},
abstractNote = {A new finite element numerical scheme for analyzing self-consistent radio-frequency (RF) sheath-plasma interaction problems in the ion cyclotron range of frequencies is applied to various problems represented by simplified models for the tokamak scrape-off layer. The present code incorporates a modified boundary condition, which is called a sheath boundary condition, that couples the radio-frequency waves and sheaths at the material boundaries by treating the sheath as a thin vacuum layer. A series of numerical analyses in one- and two-dimensional domains show several important physical properties, such as the existence of multiple roots, hysteresis effects, presence and characteristics of the sheath-plasma waves, and the phase shift of a reflected slow wave, some of which are newly identified by introducing a spatially varying plasma density and background magnetic field.},
doi = {10.1063/1.3677262},
url = {https://www.osti.gov/biblio/22043584}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 1,
volume = 19,
place = {United States},
year = {2012},
month = {1}
}