Ar ii laser generated by Landau damping of whistler waves at the lower hybrid frequency

Zhu, Peiyuan; Boswell, Roderick

doi:10.1103/physrevlett.63.2805

Cited by 92 publications

(47 citation statements)

References 2 publications

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“…The expression for the Landau damping rate has been verified experimentally [24,35] and is given in [13] by . This result and other theoretical and experimental work by Chen and others have shown [11,30] that Landau damping plays negligible (if any) role in the power absorption mechanism of helicon discharges.…”

Section: Current Challenges In Understanding Helicon Dischargesmentioning

confidence: 83%

Characterization of the resonant electromagnetic mode in helicon discharges

Panevsky

Bengtson

2004

Physics of Plasmas

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This paper presents experimental evidence for the existence of a resonant electromagnetic mode in a helicon plasma, and characterizes its resonant frequency, energy absorption rate, and contribution to the overall power balance. An experimental method developed to detect and characterize the plasma impedance is introduced. Power flow analysis shows that the resonant electromagnetic mode is the dominant mechanism driving helicon plasma discharges in cylindrical geometry. The weakly damped wavefields are absorbed in a short distance, indicating that the wavefields may be trapped in a potential well created by a density gradient.

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Section: Current Challenges In Understanding Helicon Dischargesmentioning

confidence: 83%

Characterization of the resonant electromagnetic mode in helicon discharges

Panevsky

Bengtson

2004

Physics of Plasmas

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“…These sources have a variety of applications including materials processing, 10 a plasma source for magnetic fusion studies, 11 sources for simulating space plasma interactions, 9 laser plasma sources, 12 and for space plasma thrustors. 13 Helicon plasma sources in nonuniform magnetic fields have previously been investigated by researchers including Boswell et al, 14 Chen et al, 15,16 and Gilland et al 17 The primary observation has been an increase in the plasma density when a cusp or nonuniform magnetic field has been placed in the vicinity of the helicon antenna.…”

Section: Introductionmentioning

confidence: 99%

Helicon experiments and simulations in nonuniform magnetic field configurations

et al. 1999

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Wave, antenna impedance, plasma density, and temperature anisotropy measurements are carried out for a helicon plasma source in nonuniform and uniform static magnetic fields. Strong axial density gradients associated with the nonuniform magnetic fields are observed to affect wave fields, absorption, and source efficiency. The wave field and antenna input impedance measurements are compared with a new simulation code which also calculates Poynting power flow and wave absorption profiles. Wave amplitude measurements are shown to decay more rapidly and the phase velocity varies over a wide range for the nonuniform static magnetic field case.

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“…2 They are being studied not only for use in industrial applications such as plasma processing of semiconductors and space plasma thrusters, but also for the understanding of basic plasma physics processes. [3][4][5] Helicon (or whistler) waves are a simplified form of right hand polarized electromagnetic waves in a magnetized plasma with frequencies between the lowerhybrid and electron cyclotron frequencies. The coupling of rf power to a helicon discharge can occur in three modes.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2004

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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.

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Ar ii laser generated by Landau damping of whistler waves at the lower hybrid frequency

Cited by 92 publications

References 2 publications

Characterization of the resonant electromagnetic mode in helicon discharges

Characterization of the resonant electromagnetic mode in helicon discharges

Helicon experiments and simulations in nonuniform magnetic field configurations

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

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