High-pulse-rate glow-discharge stabilization by gas flow

Dzakowic, G. S.; Wutzke, S. A.

doi:10.1063/1.1662088

Cited by 59 publications

(14 citation statements)

References 3 publications

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“…However, under highly repetitive operation, uniform glow cannot be maintained, and finally the arc will occur and the laser oscillation will stop. The causes of arc occurrence at high repetition are regarded to be the following remaining behind in the discharge space and disturbing the electric field at the time when the next pulse voltage is applied: (1) gas density depletion (the gas is heated instantly and the gas density of the discharge portion drops several percent) [1,2]; (2) ions (the negative ions having long lifetimes remain) [3]; (3) shock waves (those with Mach number of 1 to 3 repeat reflection in the discharge space) [4,5]; (4) discharge products (sputtering materials of electrodes and so on float between electrodes) [6]; and (5) temperature rise of electrodes (the gas near electrodes is heated and local gas density nonuniformity occurs) [7]. However, the influences of the respective factors on arc occurrence have not been clarified.…”

Section: Introductionmentioning

confidence: 99%

Influences of gas density depletion on high-pressure, pulsed-glow discharge

2000

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High‐pressure, pulsed glow discharge has been studied for the excitation discharge in TEA gas lasers. Various instabilities occur in the subsequent discharge, which induce the arc and collapse for the highly repetitive operation. In this paper, the influences of the gas density depletion on the high‐pressure, pulsed glow discharge have been investigated, eliminating the other instabilities such as shock waves, residual ions, discharge products, and electrode heating. The gas density depletion was produced by utilizing a subsonic flow between the curved electrodes. The comparison has been made on the discharge occurring in the presence of the gas density depletion with that by the double‐pulse experiment in a stable gas. The big gas density nonuniformity tends to cause the arc without the shocks, ions, discharge products, and electrode heating. The transition from glow to arc discharge discontinuously occurs with respect to the gas density depletion. On the other hand, the second discharge in the double‐pulse experiment becomes an arc in much smaller gas density nonuniformity, and the transition from glow to arc occurs gradually. The arc discharge might be driven by some factors other than the gas density depletion. © 2000 Scripta Technica, Electr Eng Jpn, 130(4): 9–16, 2000

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Section: Introductionmentioning

confidence: 99%

Influences of gas density depletion on high-pressure, pulsed-glow discharge

2000

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“…Also it is determined by processes related with the pulsed manner ofthe energy input into the discharge plazma and with spatial ingomogeneity ofthe discharge current density [8,10,11]. The stand-by acoustic waves forming in the discharge gap leads to the gas density re-distribution and to the discharge localization.…”

Section: I Introductionmentioning

confidence: 99%

“…The maximum volume discharge repetition rate in dense gases is defined by at least two to five gas mixture renewing cycles in the discharge gap between pulses [8,10,11]. Existance of the interface layers, where the ingomogeneities flattering and gas renewing are arise from the diffusion, limits the volume discharge repetition rate on the level [8,10,11]:…”

Section: I Introductionmentioning

confidence: 99%

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Periodic-pulse TEA lasers based on inert gases: energetic properties and pulse repetition rate

1995

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Many applications ofthe pulsed IR-lasers are based on the irradiation selective effect on the molecular bonds ofthe chemical compounds [1][2][3]. In the near JR-region lasers based on the neutral inert gases atoms transitions have the most wide wavelengst set [4][5]. The practical applications of such lasers are defined by the average irradiation power level.The highest irradiation power values are achieved in the TEA-lasers with the Xe:He mixtures-2-4 watts from the active volume Va =1,2 dm3 and hundreds ofrnilliwatts from V=50 cm3 [6,7].In lasers of high pressure energy properties of the irradiation pulse and the pulses repetition rate are limited by the phenomena ofthe volume discharge degeneration to the local one, which is not applicable for the pumping purpose [6,7]. For the present time there are established mechanisms ofthe populating ofthe inert gases atoms working levels in the volume discharge plasma and main general rules of the volume discharge forming in dense gases [5][6][7][8]. The less studied questions are related with characteristic properties of the stable volume discharge forming in the pulsed-periodical regime.The present work is denoted to the study of how volume dischar ge forming conditions effects (such as pre-ionizator geometry, start ionization level, pulsed pumping generator and discharge gap properties matching ) on the volume discharge repetition-rate and on the average irradition power level in TEA-lasers based on Xe:He Kr:He and Ar:He mixtures.2,EXPERIMENTAL SETUP. The study had been run on the TEA-laser with the closed-circuit system oflateral gas mixture through pumping, which have volume discharge zone dimensions V=42X1 ,2x0,5 cm3. The gas flow velosity was W=1 5 mIs in between electrodes spacing.The volume discharge had been initiated between profiled electrodes .In some experiments one of the main electrodes was the grid with the transparency ratio a=50%.Pre-ionization ofthe gas mixture had been performed by auxiliary crown or spark discharges, which can by placed to the side ofthe main discharge gap or behind the grid electrode.Initiation ofthe main discharge and the auxiliary one was proceed by independent pulsed generators. Thiratrons with the "duty" discharge TGI2-500/ 20 were used as switches. Temporal behavior of the discharge voltage and current pulses had been with the help of the resistive voltage deviders and the broadbard current transformers. Average laser irradiation power had been meassured by IMO -2N. Irradiation spectrum had beed analysed by monochromator 1KM-i The shape of the irradiation pulses had been recordered with the help of the photoreciever FSG-3, which was cooled by the liquid nitrogen.As the resonator mirrors it were used metall mirrors with the curvature quantity R=1 0 m and R=20 m and plain plates made of quarz and germa-O-8194-1984-2/95/$6.OO SPIE Vol. 2619 / 39 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/15/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx

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“…For certain applications of interest, notably laser radars , it would be advantageous to increase the repetition rate while maintaining the desirable qualit ies of sealed operation and small overall size . However , calculations indicate [3] that, for high-repetition-rate operation , the volume of gas between the electrodes must be renewed at least twice per pulse . This imposes restrictions on the size of the device as a sufficient volume must be provided for the gas recirculation system.…”

Section: Introductionmentioning

confidence: 99%