Ion-sound parametric turbulence and anomalous electron heating with application to helicon plasma sources

Akhiezer, A.I.; Mikhailenko, V. S.; Степанов, К.Н.

doi:10.1016/s0375-9601(98)00437-x

Cited by 47 publications

(62 citation statements)

References 12 publications

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“…5 for two different magnetic field strengths. 25,26 At magnetic field strengths greater than 500 G, the perpendicular ion temperature peaks downstream from the antenna (zϳ35 cm).…”

Section: A Characteristics Of the Ion Temperatures In Helixmentioning

confidence: 99%

Ion dynamics in helicon sources

et al. 2003

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Recent experiments have demonstrated that ion dominated phenomena, such as the lower hybrid resonance, can play an important role in helicon source operation. In this work, we review recent ion heating measurements and the role of the slow wave in heating ions at the edge of helicon. sources. We also discuss the relationship between parametrically driven waves and ion heating near the rf antenna in helicon sources. Recent measurements of parallel and rotational ion flows in helicon sources have important implications for particle confinement, instability growth, and helicon source operation. In this work we present new measurements of ion flows and summarize the important features of the flows.

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“…5 for two different magnetic field strengths. 25,26 At magnetic field strengths greater than 500 G, the perpendicular ion temperature peaks downstream from the antenna (zϳ35 cm).…”

Section: A Characteristics Of the Ion Temperatures In Helixmentioning

confidence: 99%

Ion dynamics in helicon sources

et al. 2003

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“…In 1998, Akhiezer suggested the power absorption mechanism by the kinetic parametric decay instability of the helicon pump wave. 5 The phase velocities of the parametrically excited electrostatic waves (an ion acoustic wave and a lower hybrid wave) can be comparable to the electron or the ion thermal speed. Thus, the parametric decay can be a candidate of a strong power absorption mechanism of the helicon wave.…”

Section: Introductionmentioning

confidence: 99%

Is the bulk mode conversion important in high density helicon plasma?

et al. 2016

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In a high-density helicon plasma production process, a contribution of Trivelpiece-Gould (TG) wave for surface power deposition is widely accepted. The TG wave can be excited either due to an abrupt density gradient near the plasma edge (surface conversion) or due to linear mode conversion from the helicon wave in a density gradient in the bulk region (bulk mode conversion). By numerically solving the boundary value problem of linear coupling between the helicon and the TG waves in a background with density gradient, we show that the efficiency of the bulk mode conversion strongly depends on the dissipation included in the plasma, and the bulk mode conversion is important when the dissipation is small. Also, by performing FDTD simulation, we show the time evolution of energy flux associated with the helicon and the TG waves.

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“…[3][4][5] Further mechanisms are the radio frequency (rf) energy transfer from the helicon wave to other modes either via mode conversion 6 with subsequent absorption or parametric processes excited by helicon waves. 7 Akhiezer et al 8 presented a theory of effective rf absorption leading to energy transfer from helicon waves to short-scale ion-sound turbulence excited by a parametric instability of a helicon pump wave. Recently, the parametric decay of helicon waves into Trivelpiece-Gould waves and short-scale ion-sound fluctuations was proposed and verified on a highdensity helicon discharge in a high magnetic field.…”

Section: Introductionmentioning

confidence: 99%