Kinetic theory of a gas-discharge positive column and wall sheath

Dvinin, S. A.; Dovzhenko, V. A.; Kuzovnikov, A. A.

doi:10.1134/1.952836

Cited by 5 publications

(4 citation statements)

References 3 publications

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“…Although constructed according to general trends in the modeling [26][27][28][29] of nonstationary discharges, the model specifies the peculiarities of discharge production in the field of SWs. These peculiarities concern first of all the wave energy balance Eq.…”

Section: Discussionmentioning

confidence: 99%

Time–space self-consistent dynamics of surface-wave produced discharges in pulsed regime operation

Kirov

Shivarova

1999

Physics of Plasmas

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A model for the dynamics of gas discharge production in a diffusion controlled regime by pulses carried by surface waves is presented. The model is within the fluid plasma theory. It combines ideas for a diffusion advance of the plasma and for a breakdown wave. A numerical solution of the problem is given. Results for the self-consistent time–space dynamics of plasma density and wave-field intensity are obtained from which values for the ionization front velocity are extracted.

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Section: Discussionmentioning

confidence: 99%

Time–space self-consistent dynamics of surface-wave produced discharges in pulsed regime operation

Kirov

Shivarova

1999

Physics of Plasmas

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“…The free-fall model is a particle model with ions being born at rest and then moving as particles in the electric field. A recent treatment, Dvinin et al (1999), shows how it is possible to include charge exchange collisions in the freefall model and thus create a 'bridge' to the fluid model. The ions necessarily have a spread of velocities from zero to some maximum value.…”

Section: Discussionmentioning

confidence: 99%

Are the oscillations found in electronegative plasmas at low pressure an artefact?

Franklin

Snell

2000

J. Phys. D: Appl. Phys.

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Computations are reported of the plasma-sheath in electronegative plasmas at low pressure using the fluid model in the parameter region in terms of negative ion density/electron density and electron temperature/negative ion temperature where oscillations in potential, electric field and charged particle density were previously found. In this paper, in contrast, the positive ion temperature has not been arbitrarily set to zero but has been allowed to vary, to become comparable to the negative ion temperature. It is concluded that the oscillations arise from the unphysical assumption of a significant difference between the ion temperatures, which suppressed positive ion diffusion as a mechanism to smooth out density variations. Thus, the oscillations are not intrinsic to the fluid model but rather they arise from arbitrarily setting the positive ion temperature Tp = 0.

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“…3 Mention should also be made of Dvinin et al, 4 who have managed to give a generalization of the Tonks-Langmuir 5 model by including the effect of charge exchange collisions so that they also cover much the same region of parameter space. 3 Mention should also be made of Dvinin et al, 4 who have managed to give a generalization of the Tonks-Langmuir 5 model by including the effect of charge exchange collisions so that they also cover much the same region of parameter space.…”

Section: Introductionmentioning

confidence: 99%

The plasma-sheath transition with a constant mean free path model and the applicability of the Bohm criterion

Franklin

Snell

2001

Physics of Plasmas

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Articles you may be interested inA unified analysis of plasma-sheath transition in the Tonks-Langmuir model with warm ion source Phys. Plasmas 21, 073503 (2014);The transition from collisionless to collisional active plasma in the fluid model and the relevance of the Bohm criterion to sheath formation The fluid model for positive ions is used together with the assumption of a constant ion mean free path to examine the structure of the plasma-wall sheath at low and medium pressures in plasmas where ionization is by electron impact and the ion temperature is set to zero. It is shown that in the near collisionless regime there is the same structure as was found with the constant collision frequency for momentum transfer model with the Bohm speed playing the same role and similar scaling of the transitional layer. At higher pressures there is again no transitional layer, only plasma joining smoothly to a collisional sheath, thus the Bohm criterion has no significance, but the scaling is with a different exponent than for the mobility case. No fundamental differences are found between the two models. An expression is derived to describe the boundary between the parameter region where the Bohm criterion applies and that where it does not.

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Kinetic theory of a gas-discharge positive column and wall sheath

Cited by 5 publications

References 3 publications

Time–space self-consistent dynamics of surface-wave produced discharges in pulsed regime operation

Time–space self-consistent dynamics of surface-wave produced discharges in pulsed regime operation

Are the oscillations found in electronegative plasmas at low pressure an artefact?

The plasma-sheath transition with a constant mean free path model and the applicability of the Bohm criterion

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