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Title: Resonant power absorption in helicon plasma sources

Abstract

Helicon discharges produce plasmas with a density gradient across the confining magnetic field. Such plasmas can create a radial potential well for nonaxisymmetric whistlers, allowing radially localized helicon (RLH) waves. This work presents new evidence that RLH waves play a significant role in helicon plasma sources. An experimentally measured plasma density profile in an argon helicon discharge is used to calculate the rf field structure. The calculations are performed using a two-dimensional field solver under the assumption that the density profile is axisymmetric. It is found that RLH waves with an azimuthal wave number m=1 form a standing wave structure in the axial direction and that the frequency of the RLH eigenmode is close to the driving frequency of the rf antenna. The calculated resonant power absorption, associated with the RLH eigenmode, accounts for most of the rf power deposited into the plasma in the experiment.

Authors:
; ; ; ; ;  [1];  [2];  [2];  [2];  [2];  [2]
  1. Department of Aerospace Engineering and Engineering Mechanics, University of Texas, Austin, Texas 78712 (United States)
  2. (United States)
Publication Date:
OSTI Identifier:
20860469
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 13; Journal Issue: 12; Other Information: DOI: 10.1063/1.2402913; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ABSORPTION; ANTENNAS; ARGON; AXIAL SYMMETRY; HIGH-FREQUENCY DISCHARGES; MAGNETIC FIELDS; PLASMA; PLASMA DENSITY; PLASMA POTENTIAL; STANDING WAVES; TRAPS; TWO-DIMENSIONAL CALCULATIONS; WHISTLERS

Citation Formats

Chen Guangye, Arefiev, Alexey V., Bengtson, Roger D., Breizman, Boris N., Lee, Charles A., Raja, Laxminarayan L., Institute for Fusion Studies, University of Texas, Austin, Texas 78712, Physics Department, University of Texas, Austin, Texas 78712, Institute for Fusion Studies, University of Texas, Austin, Texas 78712, Department of Electrical and Computer Engineering, University of Texas, Austin, Texas 78712, and Department of Aerospace Engineering and Engineering Mechanics, University of Texas, Austin, Texas 78712. Resonant power absorption in helicon plasma sources. United States: N. p., 2006. Web. doi:10.1063/1.2402913.
Chen Guangye, Arefiev, Alexey V., Bengtson, Roger D., Breizman, Boris N., Lee, Charles A., Raja, Laxminarayan L., Institute for Fusion Studies, University of Texas, Austin, Texas 78712, Physics Department, University of Texas, Austin, Texas 78712, Institute for Fusion Studies, University of Texas, Austin, Texas 78712, Department of Electrical and Computer Engineering, University of Texas, Austin, Texas 78712, & Department of Aerospace Engineering and Engineering Mechanics, University of Texas, Austin, Texas 78712. Resonant power absorption in helicon plasma sources. United States. doi:10.1063/1.2402913.
Chen Guangye, Arefiev, Alexey V., Bengtson, Roger D., Breizman, Boris N., Lee, Charles A., Raja, Laxminarayan L., Institute for Fusion Studies, University of Texas, Austin, Texas 78712, Physics Department, University of Texas, Austin, Texas 78712, Institute for Fusion Studies, University of Texas, Austin, Texas 78712, Department of Electrical and Computer Engineering, University of Texas, Austin, Texas 78712, and Department of Aerospace Engineering and Engineering Mechanics, University of Texas, Austin, Texas 78712. Fri . "Resonant power absorption in helicon plasma sources". United States. doi:10.1063/1.2402913.
@article{osti_20860469,
title = {Resonant power absorption in helicon plasma sources},
author = {Chen Guangye and Arefiev, Alexey V. and Bengtson, Roger D. and Breizman, Boris N. and Lee, Charles A. and Raja, Laxminarayan L. and Institute for Fusion Studies, University of Texas, Austin, Texas 78712 and Physics Department, University of Texas, Austin, Texas 78712 and Institute for Fusion Studies, University of Texas, Austin, Texas 78712 and Department of Electrical and Computer Engineering, University of Texas, Austin, Texas 78712 and Department of Aerospace Engineering and Engineering Mechanics, University of Texas, Austin, Texas 78712},
abstractNote = {Helicon discharges produce plasmas with a density gradient across the confining magnetic field. Such plasmas can create a radial potential well for nonaxisymmetric whistlers, allowing radially localized helicon (RLH) waves. This work presents new evidence that RLH waves play a significant role in helicon plasma sources. An experimentally measured plasma density profile in an argon helicon discharge is used to calculate the rf field structure. The calculations are performed using a two-dimensional field solver under the assumption that the density profile is axisymmetric. It is found that RLH waves with an azimuthal wave number m=1 form a standing wave structure in the axial direction and that the frequency of the RLH eigenmode is close to the driving frequency of the rf antenna. The calculated resonant power absorption, associated with the RLH eigenmode, accounts for most of the rf power deposited into the plasma in the experiment.},
doi = {10.1063/1.2402913},
journal = {Physics of Plasmas},
number = 12,
volume = 13,
place = {United States},
year = {Fri Dec 15 00:00:00 EST 2006},
month = {Fri Dec 15 00:00:00 EST 2006}
}