The breakdown of argon at low pressure

Pace, Jim; Parker, A. B.

doi:10.1088/0022-3727/6/12/315

Cited by 31 publications

(23 citation statements)

References 12 publications

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“…The secondary electron emission coefficient provides information on the efficiency of electron emission from the cathode due to ion bombardment, and it is normally represented by the Greek letter γ . There are methods and models that allow the evaluation of this coefficient from experimental data under the hypothesis that electron emission by ions is the only means of electron production from the cathode (Pace and Parker 1973, Phelps and Petrovic 1999, Auday et al 2000. Emission by ions can be one of the major causes of electron emission, but it is never the only cause and often it is not dominant.…”

Section: Secondary Electron Emission Coefficientmentioning

confidence: 99%

Experimental study of breakdown voltage and effective secondary electron emission coefficient for a micro-plasma device

Mariotti¹,

McLaughlin²,

Maguire³

2004

Plasma Sources Sci. Technol.

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A micro-plasma device is used as a gas sensor. The micro-plasma device produces dc discharges with a parallel-plane electrode configuration. In this paper the breakdown voltage is measured for argon with tin oxide electrodes, for three different electrode distances (0.01 cm, 0.025 cm and 0.05 cm) and for pressure between 1.3 kPa and 13.3 kPa. The effective secondary electron emission coefficient is then determined from breakdown voltage results; its behaviour is analysed and compared with other experimental results. Differences between experimental breakdown voltage and a widely accepted analytical form of the breakdown law are also shown and the influence of the secondary electron emission coefficient is underlined.

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Section: Secondary Electron Emission Coefficientmentioning

confidence: 99%

Experimental study of breakdown voltage and effective secondary electron emission coefficient for a micro-plasma device

Mariotti¹,

McLaughlin²,

Maguire³

2004

Plasma Sources Sci. Technol.

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“…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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“…The theory for this calculation is based on γ and α that the latter expresses the number of single ionizing collisions by an electron in unit distance. These two coefficients appear in the self-sustaining condition for a homogeneous electric field and their relation can be given in equation 2, [12,13]:…”

Section: A Townsend's Coefficientsmentioning

confidence: 99%

“…It depends on the gas pressure, or the gas density which is a function of collision mean free path, and the reduced electric field strength. The generalized form of α for planner diode can be expressed by equation 3, [13,14]:…”

Section: A Townsend's Coefficientsmentioning

confidence: 99%

“…It is clear that the discharge current increases by increasing the nitrogen gas pressure and reaching 27.4 mA, 49.9 mA at Pd equal to 9.12 Torr.cm, 8.3 Torr.cm for conical cathode and disc cathode respectively. Figures (12,13) show secondary electron emission coefficient, , versus Pd for mixed geometry disc-conical electrodes at different pressures. It is obvious that  increases by increasing the nitrogen gas pressure until reaching 0.55 and 0.005 at pressure equal to 0.9 Torr and 0.8 Torr respectively.…”

Section: B Comparison Between Mixed Geometry Disc-conical Electrodesmentioning

confidence: 99%

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Verification of Paschen Law using a Mixed Geometry Disc-Conical Electrodes

Radwan

El‐Khabeary

Helal

2017

International Conference on Aerospace Sciences and Aviation Tec

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This work studies the Paschen law in electrical breakdown of a mixed geometry disc-conical electrodes from aluminum material at constant 10 cm distance using nitrogen gas. The discharge characteristices including discharge voltage, discharge current and breakdown voltage against the pressure-distance multiplied were measured at different pressures. The secondary electron emission coefficient was calculated using Townsend's secondary ionization coefficient equation. A comparison between two similar disc and conical structures with a mixed disc-conical structure was made for the breakdown voltage, discharge current and secondary electron emission coefficient. It is concluded that the values of secondary electron emission coefficient of conical cathode are higher than of disc cathode due to higher ions density on conical cathode than that disc one.

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The breakdown of argon at low pressure

Cited by 31 publications

References 12 publications

Experimental study of breakdown voltage and effective secondary electron emission coefficient for a micro-plasma device

Experimental study of breakdown voltage and effective secondary electron emission coefficient for a micro-plasma device

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

Verification of Paschen Law using a Mixed Geometry Disc-Conical Electrodes

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