Paschen law for argon glow discharge

Torres, C; Reyes, Patricia Román; Castillo, F.; Martı́nez, H.

doi:10.1088/1742-6596/370/1/012067

Cited by 19 publications

(8 citation statements)

References 6 publications

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“…Figure 9 shows the theoretical Paschen curve calculated according to equation 1, using the values in table 2. Also shown are two series of experimental points, at room temperature, obtained for two different inter-electrode distances with the experimental chamber and two series of experimental points found in the literature [18][19]. Figure 9 shows also that the experimental points from this work in addition to experimental points found in the literature deviate slightly from the theoretical Paschen's curve because, especially for argon, the theoretical Paschen's curve is a good but not perfect approximation of reality.…”

Section: Change In Inter-electrode Distance Due To Materials Expansmentioning

confidence: 99%

Paschen’s Law in Extreme Pressure and Temperature Conditions

Galli

Hamrita

Jammes

et al. 2019

IEEE Trans. Plasma Sci.

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Paschen's law gives the inception voltage for an electrical discharge as a function of the product of gas pressure and the gap distance between two infinite planar electrodes. It is known that deviations from Paschen's law occur when temperature is increased. Historically two theoretical corrections, the Peek and Dumbar corrections, are proposed to predict the deviation from Paschen's law by increasing temperature. To carry out an experimental investigation on the deviation from Paschen's law by increasing temperature a customized system was designed which can operate at temperatures up to 400°C and at pressure up to 1MPa, calculated at room temperature; with an inter-electrode distance between 100µm and 6.6mm and with an error on the inter-electrode distance measurement of 20µm. In this article, firstly, the results from the experimental investigation on the deviation from Paschen's law at temperature up to 400°C are presented. The results are then compared with theoretical corrections, and finally a theory to explain the results is proposed and discussed.

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Section: Change In Inter-electrode Distance Due To Materials Expansmentioning

confidence: 99%

Paschen’s Law in Extreme Pressure and Temperature Conditions

Galli

Hamrita

Jammes

et al. 2019

IEEE Trans. Plasma Sci.

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“…The pressure dependence of breakdown voltage in our study also has been taken into consideration. As well known the voltage breakdown is a function of the gas, gas pressure and electrodes gap separation ( Paschen's law), Friedrich Paschen developed a law in 1889, which is known as the Paschen's curve describing the breakdown voltage as a function of the electrode spacing or gap (d), operating pressure (p), and gas composition (Paschen, 1889) and (Torres, 2012). Therefore, the voltage breakdown (Vb) versus gas pressure is plotted in figure (7).…”

Section: Axial Variation Of Magnetic Fieldmentioning

confidence: 99%

Measurement of Some Argon Plasma Parameters Glow Discharge Under Axial Magnetic Field

Karim

Mayi

Al-Hakary

2019

SJUOZ

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This paper investigates the characteristics some of argon plasma parameters of glow discharge under axial magnetic field. The DC power supply of range (0-6000) V is used as a breakdown voltage to obtain the discharge of argon gas. The discharge voltagecurrent (V-I) characteristic curves and Paschen's curves as well as the electrical conductivity were studied with the presents of magnetic field confinement at different gas pressures. The magnetic field up to 25 mT was obtained using four coils of radius 6 cm and 320 turn by passing A.C current up to 5 Amperes. Spectroscopic measurements are employed for purpose of estimating two main plasma parameters electron temperature (Te) and electron density (ne). Emission spectra from positive column (PC) zone of the discharge have been studies at different values of magnetic field and pressures at constant discharge currents of 1.5 mA. Electron temperature (Te) and its density are calculated from the ratio of the intensity of two emission lines of the same lower energy levels. Experimental results show the abnormal glow region characteristics (positive resistance). Breakdown voltage versus pressure curves near the curves of paschen and decrease as magnetic field increases due to magnetic field confinement of plasma charged particles. Also the electrical conductivity increases due to enhancing magnetic field at different gas pressures. Both temperature density of electron and the intensities of two selected emission lines decrease with increasing pressure due decreasing of mean free path of electron. Electron density increase according to enhancing magnetic field, while the intensity of emitting lines tends to decrease.

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“…Where the Secondary Townsend emission is responsible for gas transition from non-selfsustaining discharge into self-sustaining discharge [15,16,17]. It strongly depends on the reduced electric field intensity E/P, the collision mean free path and the work function of the cathode material [18].…”

Section: Issn 1110-0451mentioning

confidence: 99%

Performance of the Secondary Townsend Emission through the Electric Discharge Characteristics in Coaxial Vircator

Shagar

El-Latif

Ebrahim

2018

Arab Journal of Nuclear Sciences and Applications

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The influence of secondary electron emission on self-sustaining and maintaining discharge current is studied using a new type of DC glow discharge operated on virtual cathode theory through argon gas. The radial electron beam is generated outside the diode in coaxial Vircator. The transported electric discharge, from non-self-sustaining to self-sustaining discharge, occurs in the Townsend region and strongly depends on the secondary electron emission. The first ionization acts as a breakdown starter, then the second emission completes the electric discharge without consumed energy. The present work aims to study the effect of some physical parameters on the secondary electron emission to reduce the applied breakdown voltage and improve the ionization process, as well as to reduce the consumed electric energy. During the study, it was found that the self-discharge started due to the second electron emission (γ) from the cathode which increased by increasing the ionization potential and decreasing the electric field. There was a balance between the first ionization coefficient and the electron attachment which confirms that the ( γ ) is the main element in the glow discharge. The minimum breakdown voltage for argon gas is 219 volts at Pd= 8 x 10 -2 Torr.cm.

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Paschen law for argon glow discharge

Cited by 19 publications

References 6 publications

Paschen’s Law in Extreme Pressure and Temperature Conditions

Paschen’s Law in Extreme Pressure and Temperature Conditions

Measurement of Some Argon Plasma Parameters Glow Discharge Under Axial Magnetic Field

Performance of the Secondary Townsend Emission through the Electric Discharge Characteristics in Coaxial Vircator

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