Particle and power balances of hot-filament discharge plasmas in a multidipole device

Cho, Moo‐Hyun; Hershkowitz, N.; Intrator, T.

doi:10.1063/1.345358

Cited by 27 publications

(36 citation statements)

References 8 publications

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“…10. 20 For curve A no insulator was present while for curve B the insulator was present. That result was attributed to the presence or absence of the insulator.…”

Section: -5mentioning

confidence: 99%

Sheaths: More complicated than you think

Hershkowitz¹

2005

Physics of Plasmas

184

162

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Sheaths in low temperature collisionless and weakly collisional plasmas are often viewed as simple examples of nonlinear physics. How well do we understand them? Closer examination indicates that they are far from simple. Moreover, many predicted sheath properties have not been experimentally verified and even the appropriate "Bohm velocity" for often encountered two-ion species plasma is unknown. In addition, a variety of sheathlike structures, e.g., double layers, can exist, and many two-and three-dimensional sheath effects have not been considered. Experimental studies of sheaths and presheaths in weakly collisional plasmas are described. A key diagnostic is emissive probes operated in the "limit of zero emission." Emissive probes provide a sensitive diagnostic of plasma potential with a resolution approaching 0.1 V and a spatial resolution of 0.1 cm. Combined with planar Langmuir probes and laser-induced fluorescence, they have been used to investigate a wide variety of sheath, presheath, and sheathlike structures. Our experiments have provided some answers but have also raised more questions.

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“…10. 20 For curve A no insulator was present while for curve B the insulator was present. That result was attributed to the presence or absence of the insulator.…”

Section: -5mentioning

confidence: 99%

Sheaths: More complicated than you think

Hershkowitz¹

2005

Physics of Plasmas

184

162

View full text Add to dashboard Cite

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“…Some important different aspects of a hot-filament discharge were elaborated by Cho et al [5] in their work on the influence of a positively biased electrode on the plasma potential. They used a closed set of charge, particle and energy balance equations in order to extract particular information concerning the plasma potential as a function of the anode bias potential.…”

Section: Introductionmentioning

confidence: 99%

“…Doubleplasma devices are far from being understood, although there exists an extensive body of empirical data on the behavior of the main plasma parameters as functions of the external conditions. The latter are, e.g., the wall geometry and surface conditions [2], effects of mechanical and electrical supports and additional electrodes [5], probes [6], additional wire grids for electron heating [7], electrostatic confinement grids [8], the filament cathode arrangement and temperature [2], the ionizing electron beam energy, the magnetic cusp geometry [3,9] and magnetic field strength [10], effects of secondary electrons emitted from the walls [11] and other supplementary electron beams [12,13,14], the type of the gas used [3], etc.…”

Section: Introductionmentioning

confidence: 99%

Similarity rules for collisionless hot‐filament discharges

Jelić

Kühn

Schrittwieser

2003

Contrib. Plasma Phys.

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The plasma parameters of a collisionless hot-filament discharge are investigated theoretically and experimentally as functions of a dimensionless variable called the discharge efficiency, which is a product of several relevant external parameters. It is found that the main plasma parameters, as measured in plasma chambers that are either geometrically different or filled with different working gases, depend on this variable in approximately the same way. Consequently, the number of experimental data necessary for discharge characterization may be drastically reduced.

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“…It has been shown that a positively biased wire grid can serve either to control the plasma potential [2], or to raise the electron temperature [3]. Large probes and anodes were used for driving the plasma potential [4] and for producing anode-type double layers [5,6,7].…”

Section: Introductionmentioning

confidence: 99%

Effects of electron‐absorbing boundaries on the plasma parameters of a hot‐filament discharge

Jelić

Schrittwieser

Kühn

2003

Contrib. Plasma Phys.

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In this paper we investigate theoretically and experimentally the plasma parameters in a double-plasma device in the presence of an additional electron-absorbing boundary. The latter is formed by an electrode of variable size immersed in the plasma. It is found that, depending on its size and bias potential, such an anode can considerably influence the plasma parameters. Good qualitative and fair quantitative agreement between theoretical predictions and laboratory measurements of the plasma parameters is found for various discharge conditions. In addition we discuss the consequences of our results with respect to the existence conditions of anode-type double layers in double-plasma devices.

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Particle and power balances of hot-filament discharge plasmas in a multidipole device

Cited by 27 publications

References 8 publications

Sheaths: More complicated than you think

Sheaths: More complicated than you think

Similarity rules for collisionless hot‐filament discharges

Effects of electron‐absorbing boundaries on the plasma parameters of a hot‐filament discharge

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