Influence of preionization conditions on the development of a homogeneous discharge in gases

Karnyushin, V. N.; Malov, Alexander N.; Soloukhin, R. I.

doi:10.1070/qe1978v008n03abeh010011

Cited by 24 publications

(13 citation statements)

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“…It is clear from the expression (11) that at some distance from the cathode for E 0 = 1 kV/cm, d = 40 cm, and n(0) = 10 9 cm [3] when the condition (9) is obeyed, the value of n(x) is no longer dependent on n(0). Therefore, the discharge gap will be¯lled uniformly with electrons (in a plane perpendicular to x) even in the case of a strong inhomogeneity of the distribution n(0) over the cathode area, which makes it possible to form a SSVD avoiding small-scale inhomogeneities (typical of ultraviolet preionization and due to the shadow formed in the discharge volume by the grid cathode) [29] and to increase the small-signal gain as well as the e±ciency of CO 2 lasers.…”

Section: Model Of An Electron°ux Propagationmentioning

confidence: 94%

“…(11) shows that n(d) is clearly greater than n min required for the formation of a self-sustained volume discharge [2]. The condition (9) is then satis¯ed already for n(0) =: 10 8 ¡ 10 9 cm [3]. We shall show that such low electron densities at the cathode can be provided by practically any type of auxiliary discharge.…”

Section: Model Of An Electron°ux Propagationmentioning

confidence: 99%

“…A SSVD can be established in a gas by creating primary electrons the density of which should exceed a certain minimum value n min throughout the discharge gap [1,3]. Various methods for preionization of a gas in the discharge gap have been developed for this purpose [4,7].…”

Section: Part 1 1 Introductionmentioning

confidence: 99%

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High power self-controled volume discharge based molecular lasers

Аполлонов¹

2003

Open Physics

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An investigation was made of the characteristics of the formation of a selfcontroled volume discharge for the pumping of CO 2 lasers, i.e. self-sustained volume discharge (SSVD), which involved a preliminary lling of a discharge gap by an electron ®ux from an auxiliary-discharge plasma. We have found that this method was suitable for large interelectrode gaps, that distortion of the electric eld in the gap by the space charge of the electron ®ux played an important role in the formation of the discharge and that the electrodes could be pro led dynamically during propagation of an electron ®ux through the discharge gap and a SSVD could form in systems with a strongly inhomogeneous eld. High power SSVD based CO2 laser systems have been created and investigated. Another type of self-controled volume discharge without pre-ionization, i.e. a selfinitiated volume discharge (SIVD), in nonchain HF lasers with SF 6 -C 2 H 6 mixtures was investigated as well in our review. We have established that, after the primary local electrical breakdown of the discharge gap, the SIVD spreads along the gap in directions perpendicular to that of the electric eld by means of the successive formation of overlapping di¬use channels under a discharge voltage close to its quasi-steady state value. It is shown that, as new channels appear, the current ®owing through the channels formed earlier decreases. The volume occupied by the SIVD increases with increase in the energy deposited in the plasma and, when the discharge volume is con ned by a dielectric surface, the discharge voltage increases simultaneously with increase in the current. The possible mechanisms which explain the observed phenomena, namely the dissociation of SF 6 molecules and electron attachment SF 6 molecules, are examined. A simple analytical model, which makes it possible to describe these mechanisms at a qualitative level, was developed. High power SIVD based HF(DF) lasers have been developed and tested. c ® Central European Science Journals. All rights reserved.Keywords: Lasers, plasma, discharge PACS: 42.55. Ks, 52.80

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Section: Model Of An Electron°ux Propagationmentioning

confidence: 94%

Section: Model Of An Electron°ux Propagationmentioning

confidence: 99%

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High power self-controled volume discharge based molecular lasers

Аполлонов¹

2003

Open Physics

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“…Preionization of laser gases has proved to be an effective means of initiating a homogeneous discharge at gas pressures higher than one atmosphere, and some papers have been published on the preionization requirements for obtaining a homogeneous discharge [1][2][3][4]. Several experimental approaches have been carried out regarding the development of preionization sources.…”

Section: -Introductionmentioning

confidence: 98%

Study of self-preionized XeCl* electron-avalanched discharges

et al. 1991

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“…[1][2][3] Various preionization methods for a gas in the discharge gap have been developed for this purpose. 4 -7 With these methods, primary electrons can be created directly in the discharge gap, which can make it difficult to establish the necessary conditions for the formation of a SSVD.…”

Section: Introductionmentioning

confidence: 99%

High-power self-controlled volume-discharge-based molecular lasers

Аполлонов

2004

Opt. Eng

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An investigation is made of the characteristics of the formation of a self-controlled volume discharge for pumping CO 2 lasers, i.e., self-sustained volume discharge (SSVD), which involves the preliminary filling of a discharge gap by an electron flux from an auxiliary discharge plasma. It is determined that this method is suitable for large interelectrode gaps, that distortion of the electric field in the gap by the space charge of the electron flux plays an important role in the formation of the discharge, that the electrodes could be profiled dynamically during propagation of an electron flux through the discharge gap, and a SSVD could form in systems with a strongly inhomogeneous field. High-power SSVD-based CO 2 laser systems are created and investigated. Another type of self-controlled volume discharge without preionization, i.e., a selfinitiated volume discharge (SIVD), in nonchain HF lasers with SF 6 -C 2 H 6 mixtures is also investigated. It is established that, after the primary local electrical breakdown of the discharge gap, the SIVD spreads along the gap in directions perpendicular to that of the electric field by means of the successive formation of overlapping diffuse channels under a discharge voltage close to its quasi-steady-state value. As new channels appear, the current that flows through the channels formed earlier decreases. The volume occupied by the SIVD increases when the energy deposited in the plasma increases, and, when the discharge volume is confined by a dielectric surface, the discharge voltage increases simultaneously when the current increases. The possible mechanisms that explain the observed phenomena, namely the dissociation and electron attachment of SF 6 molecules, are examined. A simple analytical model is developed that makes it possible to describe these mechanisms at a qualitative level. High-power SIVD-based HF(DF) lasers are developed and tested.

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Influence of preionization conditions on the development of a homogeneous discharge in gases

Cited by 24 publications

References 0 publications

High power self-controled volume discharge based molecular lasers

High power self-controled volume discharge based molecular lasers

Study of self-preionized XeCl* electron-avalanched discharges

High-power self-controlled volume-discharge-based molecular lasers

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