The structure of the electron distribution function in R striations

Golubovskiǐ, Yu. B.; Skoblo, A Yu

doi:10.1134/s1063785007080263

Cited by 9 publications

(13 citation statements)

References 6 publications

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“…10 are complex, so that the physical solution is obtained taking the real part of the solution. Note also that the factor exp (−jωt + j z k(z ′ ) dz ′ ) may be canceled out from equation (10) so that only the radial dependence is retained.…”

Section: E Plasma Electrodynamicsmentioning

confidence: 99%

“…The numerous theories developed over the years could not be tested until the advance of computer technology that allowed the numerical study of this topic. Theoretical and numerical analysis made by Golubovskii and co-workers showed that in many cases the contraction effect may be explained solely by the dependence of the ionization rate with electron density, which is related to the competition of electron-atom and electron-electron collisions [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Causes of plasma column contraction in surface-wave-driven discharges in argon at atmospheric pressure

et al. 2018

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In this work we compute the main features of a surface-wave-driven plasma in argon at atmospheric pressure in view of a better understanding of the contraction phenomenon. We include the detailed chemical kinetics dynamics of Ar and solve the mass conservation equations of the relevant neutral excited and charged species. The gas temperature radial profile is calculated by means of the thermal diffusion equation. The electric field radial profile is calculated directly from the numerical solution of the Maxwell equations assuming the surface wave to be propagating in the TM_{00} mode. The problem is considered to be radially symmetrical, the axial variations are neglected, and the equations are solved in a self-consistent fashion. We probe the model results considering three scenarios: (i) the electron energy distribution function (EEDF) is calculated by means of the Boltzmann equation; (ii) the EEDF is considered to be Maxwellian; (iii) the dissociative recombination is excluded from the chemical kinetics dynamics, but the nonequilibrium EEDF is preserved. From this analysis, the dissociative recombination is shown to be the leading mechanism in the constriction of surface-wave plasmas. The results are compared with mass spectrometry measurements of the radial density profile of the ions Ar^{+} and Ar_{2}^{+}. An explanation is proposed for the trends seen by Thomson scattering diagnostics that shows a substantial increase of electron temperature towards the plasma borders where the electron density is small.

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Section: E Plasma Electrodynamicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Causes of plasma column contraction in surface-wave-driven discharges in argon at atmospheric pressure

et al. 2018

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“…For low pR, when the electron energy balance is determined by inelastic collisions, the plasma is disturbed by the anode over a large distance about k e ) R. At this distance, a depletion of the EEDF by lowenergy electrons takes place. 36,37 Visually, this plasma region looks uniform, and the light emission decreases only at a small distance of the order of k Ã near the anode forming anode dark space (see Figure 6(a)). At the anode surface, a bright luminous layer is observed covering the entire surface of the anode (Figure 7).…”

Section: Anode Regionmentioning

confidence: 99%

Advances in electron kinetics and theory of gas discharges

Kolobov

2013

Physics of Plasmas

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Electrons, like people, are fertile and infertile: high-energy electrons are fertile and able to reproduce."-Lev Tsendin Modern physics of gas discharges increasingly uses physical kinetics for analysis of non-equilibrium plasmas. The description of underlying physics at the kinetic level appears to be important for plasma applications in modern technologies. In this paper, we attempt to grasp the legacy of Professor Lev Tsendin, who advocated the use of the kinetic approach for understanding fundamental problems of gas discharges. We outline the fundamentals of electron kinetics in low-temperature plasmas, describe elements of the modern kinetic theory of gas discharges, and show examples of the theoretical approach to gas discharge problems used by Lev Tsendin. Important connections between electron kinetics in gas discharges and semiconductors are also discussed. Using several examples, we illustrate how Tsendin's ideas and methods are currently being developed for the implementation of next generation computational tools for adaptive kinetic-fluid simulations of gas discharges used in modern technologies. V C 2013 AIP Publishing LLC. [http://dx.

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“…Since the layered-glow is a kind of striations observed in conventional DC plasmas, it is noticed a) Contributed paper, published as part of the Proceedings of the 15th International Conference on Ion Sources, Chiba, Japan, September 2013. b) Electronic mail: jkjlsh1@snu.ac.kr that the potential structure of layered-glow is similar to that of striation, i.e., a step-like double layer potential structure. 5,6 Therefore, it is recognized that some fraction of electrons can be accelerated through the step-like potential structure such that they may have sufficient energy to additionally ionize the helium ions already existed in the plasma ball.…”

Section: Introductionmentioning

confidence: 99%

Investigation of helium ion production in constricted direct current plasma ion source with layered-glows

Lee

Chung

Park³

et al. 2014

Review of Scientific Instruments

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Generation of helium ions is experimentally investigated with a constricted direct current (DC) plasma ion source operated at layered-glow mode, in which electrons could be accelerated through multiple potential structures so as to generate helium ions including He(2+) by successive ionization collisions in front of an extraction aperture. The helium discharge is sustained with the formation of a couple of stable layers and the plasma ball with high density is created near the extraction aperture at the operational pressure down to 0.6 Torr with concave cathodes. The ion beam current extracted with an extraction voltage of 5 kV is observed to be proportional to the discharge current and inversely proportional to the operating pressure, showing high current density of 130 mA/cm(2) and power density of 0.52 mA/cm(2)/W. He(2+) ions, which were predicted to be able to exist due to multiple-layer potential structure, are not observed. Simple calculation on production of He(2+) ions inside the plasma ball reveals that reduced operating pressure and increased cathode area will help to generate He(2+) ions with the layered-glow DC discharge.

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The structure of the electron distribution function in R striations

Cited by 9 publications

References 6 publications

Causes of plasma column contraction in surface-wave-driven discharges in argon at atmospheric pressure

Causes of plasma column contraction in surface-wave-driven discharges in argon at atmospheric pressure

Advances in electron kinetics and theory of gas discharges

Investigation of helium ion production in constricted direct current plasma ion source with layered-glows

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