Dc breakdown of low pressure gas in long tubes

Lisovskiy, Valeriy; Koval, V. A.; Yegorenkov, Vladimir

doi:10.1016/j.physleta.2011.03.035

Cited by 31 publications

(19 citation statements)

References 18 publications

(28 reference statements)

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“…A direct current generator capable of producing discharge currents up to 100 mA and permitting application of voltage up to 3000 V across the electrodes is required to perform this work. Such high voltage values are required for the gas breakdown in long tubes that follows, e.g., from the results of [15]. Electrodes have to span the total tube cross-section to prevent the ignition of undesirable, parasitic discharges.…”

Section: Experimental Conditions For Performing the Laboratory Workmentioning

confidence: 99%

Validating the Goldstein–Wehner law for the stratified positive column of dc discharge in an undergraduate laboratory

Lisovskiy¹,

Koval²,

Artushenko³

et al. 2012

Eur. J. Phys.

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In this paper we suggest a simple technique for validating the Goldstein-Wehner law for a stratified positive column of dc glow discharge while studying the properties of gas discharges in an undergraduate laboratory. To accomplish this a simple device with a pre-vacuum mechanical pump, dc source and gas pressure gauge is required. Experiments may be performed in nitrogen or even in air. First you need to photograph the discharge tube with striations at different gas pressure values and then you need to determine the thickness of the first striation on a computer monitor.

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Section: Experimental Conditions For Performing the Laboratory Workmentioning

confidence: 99%

Validating the Goldstein–Wehner law for the stratified positive column of dc discharge in an undergraduate laboratory

Lisovskiy¹,

Koval²,

Artushenko³

et al. 2012

Eur. J. Phys.

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show abstract

“…The breakdown properties of gases, especially noble gases, had been studied by various methods since the early years of research into gas discharge physics. [1][2][3][4][5][6][7][8][9][10][11] For helium gas, the subject of this work, accurate and consistent results exist for applied voltage up to about 1 kV on the lowpressure branch of the Paschen curve. For the range of 10 3 À 10 4 V, the Paschen curves obtained both by analytical calculation 12 and through particle simulations 13 are not in good agreement with experimental results, for reasons not yet fully understood.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Paschen curve for helium in the 100–1000 kV range

Khrabrov

Kaganovich

et al. 2017

Physics of Plasmas

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The left branch of the Paschen curve for helium gas is studied both experimentally and by means of particle-in-cell/Monte Carlo collision (PIC/MCC) simulations. The physical model incorporates electron, ion, and fast atom species whose energy-dependent anisotropic scattering on background neutrals, as well as backscattering at the electrodes, is properly accounted for. For the range of breakdown voltage 15 kV V br 130 kV, a good agreement is observed between simulations and available experimental results for the discharge gap d ¼ 1.4 cm. The PIC/MCC model is used to predict the Paschen curve at higher voltages up to 1 MV, based on the availability of input atomic data. We find that the pd similarity scaling does hold and that above 300 kV, the value of pd at breakdown begins to increase with increasing voltage. To achieve good agreement between PIC/ MCC predictions and experimental data for the Paschen curve, it is essential to account for impact ionization by fast atoms (produced in charge exchange) and ions and for anisotropic scattering of all species on background atoms. With the increase of the applied voltage, energetic fast atoms progressively dominate in the overall ionization rate. The model makes this clear by predicting that breakdown would occur even without electron-and ion-induced ionization of the background gas, due to ionization by fast atoms backscattered at the cathode, and their high production rate in charge exchange collisions. Multiple fast neutrals per ion are produced when the free path is small compared to the electrode gap. Published by AIP Publishing.

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“…It is also possible to use the known properties of the discharge in one gap to derive the characteristics of the discharges in another geometrically identical gap due to the similarity of gas discharge; this is useful in cases where experimental studies may not be practical or even possible [2,10,16,20]. One pre-condition for such an experiment is to verify that there is a similar discharge in the specified geometrically similar gaps.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the similarity of gas discharge in low-pressure Argon gaps

et al. 2022

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Through experiments and theoretical analysis, we investigated the similarity of gas discharge in low-pressure Argon gaps between two plane-parallel electrodes. We found that the breakdown voltages depended not only on gap length and the product of gas pressureand gap length but also on the aspect ratio of the gap, i.e. Ub = f (pd, d/r). When we considered similar discharge gaps, the radius r, gap length d, and gas pressure p fulfilled the conditions of p1 r1 = p2 r2 and p1d1 = p2 d2. In this situation, the reduced field E/p was also constant. The voltage-current characteristic curves of similar gaps were approximately the same, which is a novel experimental result. Comparison of the discharge physical parameters of the scaled-down gap and prototype gap shows that the proportional relations can be derived from the similarity law. Our experimental results provide some instructions on extrapolating two similar gaps and their discharge properties. Application of the similarity law is straightforward when we scale the discharges up or down if they are too small or large.

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Dc breakdown of low pressure gas in long tubes

Cited by 31 publications

References 18 publications

Validating the Goldstein–Wehner law for the stratified positive column of dc discharge in an undergraduate laboratory

Validating the Goldstein–Wehner law for the stratified positive column of dc discharge in an undergraduate laboratory

Investigation of the Paschen curve for helium in the 100–1000 kV range

Experimental study on the similarity of gas discharge in low-pressure Argon gaps

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