Quasistatic Plasma Sources : Physical Principles, Modelling Experiments, Application Aspects

Shamrai, K. P.; Aleksandrov, A. F.; Bougrov, G.E.; Virko, V. F.; Katiukha, V.P.; Koh, Seoh-Keun; Kralkina, E.A.; Kirichenko, G. S.; Rukhadze, A. A.

doi:10.1051/jp4:1997430

Cited by 7 publications

(7 citation statements)

References 13 publications

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“…As well, the nonmonotonic variation of the absorbed power with density was calculated using the ANTENA code [5]. Finally, a strong support to the idea is seen in experimental data [9]. In those experiments, a dense plasma column preformed with a pulsed microwave ECR discharge was excited by a weak rf signal with the use of antenna shown in figure 1(a).…”

Section: Discussionmentioning

confidence: 61%

“…Calculations with the ANTENA code also show a non-monotonic dependence of power on density [5]. As well, multi-peaked absorption curves were measured in experiments on a weak rf signal interaction with a dense plasma column preformed by an ECR discharge [9]. † E-mail address: kshamrai@kinr.kiev.ua.…”

Section: Introductionmentioning

confidence: 81%

“…Mechanisms of the power absorption connected with the inductive coupling seem to be clearer. They were analysed both analytically and numerically in a set of papers [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Results show that the efficiency of absorption depends on three principal factors.…”

Section: Efficiency Of the Power Absorption In Inductively Coupled He...mentioning

confidence: 99%

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Stable modes and abrupt density jumps in a helicon plasma source

Shamrai

1998

Plasma Sources Sci. Technol.

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Abrupt changes of discharge regimes in a helicon plasma source are treated proceeding from the model that assumes an rf power absorption to arise from a linear conversion of helicon waves into electrostatic waves at a plasma edge. The efficiency of conversion and thus of power absorption is found to be proportional to the squared edge amplitude of the helicon wave. The model yields a non-monotonic variation of absorbed power with the plasma density at a fixed antenna current. The specific shape of the absorption curve, that is the location, heights and widths of absorption peaks, turns out to depend on the source and antenna geometry, external magnetic field and driving frequency, whereas the absorption demonstrates extremely weak dependence on gas pressure. A power balance for the source plasma predicts a stable discharge in several density modes, and a possibility of abrupt transitions between them. The density jumps may be stimulated by the variation of absorbed power, driving frequency and/or magnetic field. The increase of magnetic field or the decrease of driving frequency may give rise to discharge disruptions. A discussion is presented of experimental data confirming the validity of the model and results obtained.

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Section: Discussionmentioning

confidence: 61%

Section: Introductionmentioning

confidence: 81%

Section: Efficiency Of the Power Absorption In Inductively Coupled He...mentioning

confidence: 99%

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Stable modes and abrupt density jumps in a helicon plasma source

Shamrai

1998

Plasma Sources Sci. Technol.

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“…The variety of these sources has been developed for applications and basic research, such as materials surface processing, space propulsion, decomposition of hazardous substances, modelling of space phenomena, etc (e.g. [2,[6][7][8][9][10]) including the compact sources with permanent magnets (PMs) [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Wave stimulated phenomena in inductively coupled magnetized plasmas

Shamrai

Shinohara

Virko

et al. 2005

Plasma Phys. Control. Fusion

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Linear and nonlinear wave phenomena and their influence on the discharge performance are considered in the helicon plasma (HP) and magnetized inductively coupled plasma (MICP). Magnetic field configuration is shown to result in strong variation in the efficiency of plasma production caused by alterations of the character of wave processes rather than by the particle confinement. Effects of magnetic configuration are found to be dominant in operation of the compact HP with permanent magnet. Low frequency turbulence in the megahertz range is revealed to be inherent for both the HP and MICP and to depend strongly on the magnetic configuration. Enhanced axial electric field arising in front of the metal end plate in the HP is argued to be a potential source of the nonlinear effects.

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“…Helicon sources are known as the most efficient tools for dense plasma production among a variety of inductively coupled plasmas (ICPs) [1,2]. These devices are being developed for various applications including electric propulsion with low [3][4][5] and high [6][7][8] thrust. The interest in helicon thrusters has increased after revealing the effect of the emergent ion beam formation by a current-free double layer (DL) that appears at the outlet of the source operating in the sub-millitorr pressure range [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

The effect of magnetic configuration on ion acceleration from a compact helicon source with permanent magnets

Virko¹,

Virko²,

Slobodyan³

et al. 2009

Plasma Sources Sci. Technol.

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Plasma production and emergent ion beam formation were examined in a compact helicon plasma source with different configurations of permanent magnets. Source modification employing a cylindrical ferrite assembly (CFA) with radial magnetization was found to produce high-density plasmas over a broad pressure range, but the ion beam was generated only at sub-millitorr pressures and provided that a pressure difference was set up between the discharge and the drift chambers. The modification employing the near field of a single annular ferrite (AF) was ineffective in both dense plasma and ion beam generation. The modification employing a combination of the AF with the CFA was found to be the most efficient for ion acceleration. It generated a fast ion beam with an energy of up to 200 eV in the sub-millitorr pressure range, and could produce the accelerated ions even in the millitorr range.

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Quasistatic Plasma Sources : Physical Principles, Modelling Experiments, Application Aspects

Cited by 7 publications

References 13 publications

Stable modes and abrupt density jumps in a helicon plasma source

Stable modes and abrupt density jumps in a helicon plasma source

Wave stimulated phenomena in inductively coupled magnetized plasmas

The effect of magnetic configuration on ion acceleration from a compact helicon source with permanent magnets

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