Spatially limited ion acoustic wave activity in low-pressure helicon discharges

C. S. Corr; N. Plihon; P. Chabert; O. Sutherland; R. W. Boswell

doi:10.1063/1.1785790

Spatially limited ion acoustic wave activity in low-pressure helicon discharges

C. S. Corr^*, N. Plihon, P. Chabert, O. Sutherland, R. W. Boswell

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

15 Citations (Scopus)

Abstract

Ion acoustic wave phenomena are studied and compared in two low-pressure argon discharges created by helicon sources. The wave amplitudes are spatially localized near the edge of a plasma column as the amplitudes of the "mirror waves" that are separated from the helicon source frequency by the ion wave frequency. Dependencies of the ion wave on radial position, pressure, input power, and magnetic field are investigated. Measurements of the wavelength show that the wave is traveling azimuthally at approximately the ion sound speed in the direction of electron gyration. Although the wave spectra are indicative of a parametric decay phenomenon, it seems more likely that the radial plasma pressure gradient drives an ion acoustic instability which then modulates the helicon source.

Original language	English
Pages (from-to)	4596-4602
Number of pages	7
Journal	Physics of Plasmas
Volume	11
Issue number	10
DOIs	https://doi.org/10.1063/1.1785790
Publication status	Published - Oct 2004

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title = "Spatially limited ion acoustic wave activity in low-pressure helicon discharges",

abstract = "Ion acoustic wave phenomena are studied and compared in two low-pressure argon discharges created by helicon sources. The wave amplitudes are spatially localized near the edge of a plasma column as the amplitudes of the {"}mirror waves{"} that are separated from the helicon source frequency by the ion wave frequency. Dependencies of the ion wave on radial position, pressure, input power, and magnetic field are investigated. Measurements of the wavelength show that the wave is traveling azimuthally at approximately the ion sound speed in the direction of electron gyration. Although the wave spectra are indicative of a parametric decay phenomenon, it seems more likely that the radial plasma pressure gradient drives an ion acoustic instability which then modulates the helicon source.",

author = "Corr, {C. S.} and N. Plihon and P. Chabert and O. Sutherland and Boswell, {R. W.}",

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T1 - Spatially limited ion acoustic wave activity in low-pressure helicon discharges

AU - Corr, C. S.

AU - Plihon, N.

AU - Chabert, P.

AU - Sutherland, O.

AU - Boswell, R. W.

PY - 2004/10

Y1 - 2004/10

N2 - Ion acoustic wave phenomena are studied and compared in two low-pressure argon discharges created by helicon sources. The wave amplitudes are spatially localized near the edge of a plasma column as the amplitudes of the "mirror waves" that are separated from the helicon source frequency by the ion wave frequency. Dependencies of the ion wave on radial position, pressure, input power, and magnetic field are investigated. Measurements of the wavelength show that the wave is traveling azimuthally at approximately the ion sound speed in the direction of electron gyration. Although the wave spectra are indicative of a parametric decay phenomenon, it seems more likely that the radial plasma pressure gradient drives an ion acoustic instability which then modulates the helicon source.

AB - Ion acoustic wave phenomena are studied and compared in two low-pressure argon discharges created by helicon sources. The wave amplitudes are spatially localized near the edge of a plasma column as the amplitudes of the "mirror waves" that are separated from the helicon source frequency by the ion wave frequency. Dependencies of the ion wave on radial position, pressure, input power, and magnetic field are investigated. Measurements of the wavelength show that the wave is traveling azimuthally at approximately the ion sound speed in the direction of electron gyration. Although the wave spectra are indicative of a parametric decay phenomenon, it seems more likely that the radial plasma pressure gradient drives an ion acoustic instability which then modulates the helicon source.

UR - http://www.scopus.com/inward/record.url?scp=8644230966&partnerID=8YFLogxK

U2 - 10.1063/1.1785790

DO - 10.1063/1.1785790

M3 - Article

SN - 1070-664X

VL - 11

SP - 4596

EP - 4602

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 10

ER -

Spatially limited ion acoustic wave activity in low-pressure helicon discharges

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