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

Lisovskiy, Valeriy; Koval, V A; Artushenko, Ekaterina; Yegorenkov, Vladimir

doi:10.1088/0143-0807/33/6/1537

Cited by 23 publications

(17 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This method allows us to determine the sheath boundary in visual which has been widely adopted by many authors. [24][25][26][29][30][31][32] Note that this assumption is based on a simple consideration of the electron energy and multiplication kinetics, which may not be accurate under the entire range of realistic conditions. However, for low-pressure short glow discharges, even considering the nonlocal effect of ionizations, it is appropriate to consider that the brightest point of the discharge corresponds to the cathode sheath boundary where the fast electron flux is still insignificant in the near-cathode region.…”

Section: Experimental Methodsmentioning

confidence: 99%

Investigation on the similarity law of low-pressure glow discharges based on the light intensity distributions in geometrically similar gaps

Wang

Zou

et al. 2017

Physics of Plasmas

View full text Add to dashboard Cite

Experimental investigation of the light intensity distributions of a low-pressure glow discharge is carried out in several pairs of geometrically similar plane-parallel gaps, of which the aspect ratios and the products of the linear dimension and the gas pressure are the same. The discharge images are captured using a Charge Coupled Device camera, from which the corresponding axial light intensity distributions are presented. Based on the obtained light intensity distributions, the thicknesses of cathode fall layers were identified by measuring the distance between the peak glow position and the cathode boundary. The influence of the discharge current on the light intensity distributions on the geometrically similar gaps is also investigated. It was found that, for discharges in each pair of geometrically similar gaps, the reduced cathode fall thicknesses are observed to be identical when the discharge currents are the same. The similarity relation of the cathode fall thickness is validated for low-pressure glow discharges in gaps for different aspect ratios. Published by AIP Publishing.

show abstract

Section: Experimental Methodsmentioning

confidence: 99%

Investigation on the similarity law of low-pressure glow discharges based on the light intensity distributions in geometrically similar gaps

Wang

Zou

et al. 2017

Physics of Plasmas

View full text Add to dashboard Cite

show abstract

“…Fascinating phenomena may emerge from the interplay between electromagnetism, fluid dynamics and quantum physics in plasma physics. Several experimental devices have recently been designed as educational tools at the undergraduate level [1][2][3][4][5][6][7]. Widely used, fluorescent tubes or other plasma-based lighting devices remain an affordable and simple way to introduce several fundamental concepts of plasma physics [8][9][10][11][12].…”

Section: Physical Phenomenon and Article Outlinementioning

confidence: 99%

Why do aged fluorescent tubes flicker?

Plihon¹,

Ferrand²,

Guyomar³

et al. 2017

Eur. J. Phys.

View full text Add to dashboard Cite

Common experience shows that aged and defective fluorescent tubes or bulbs may flicker and emit a clicking sound while struggling to light up. In this article, the physical mechanisms controlling the initial illumination of a functioning fluorescent tube are investigated using a simple and affordable experimental setup. Thermionic emission from the electrodes of the tube controls the startup of fluorescent tubes. The origin of the faulty startup of aged fluorescent tubes is discussed and flickering regimes using functional tubes are artificially produced when decreasing, in a controlled manner, electron emission by the thermionic effect. The physical parameters controlling the occurrence of flickering light are discussed, and their temporal statistics are reported.

show abstract

“…The shape of a hollow cathode is chosen such that it may be optimally applied in a given plasma technology. In the common glow discharge with flat cathode electrons that escape the sheath can lose their energy along the full length of the negative glow which can measure in tenths of centimeters [14,17,18] in low pressures. In a hollow cathode that is filled with negative glow (in the so-called hollow mode) almost all the energy gathered by electrons is dissipated within the cavity itself, which allows the high density plasma to stay there [12,15,16].…”

Section: Introductionmentioning

confidence: 99%

Glow Discharge With a Hollow Cathode in Carbon Dioxide

Lisovskiy¹,

Dudin²,

Platonov³

et al. 2022

Problems of Atomic Science and Technology

View full text Add to dashboard Cite

This paper is devoted to an experimental study of the dc discharge with a hollow cathode within the carbon dioxide pressure range of 0.06...2 Torr. The registered CVCs in the pressure range below 0.5 Torr possess a hysteretic pattern with transitions between glow and hollow modes. We have demonstrated that the value of the product of gas pressure and distance between cathode plates p·dh = 0.32 Torr·cm is optimum for the application of the discharge with hollow cathode for plasma conversion of the carbon dioxide when the maximum discharge current is observed. Then the cathode cavity is filled with a high density discharge. Treating the optical emission spectrum has revealed that in the negative glow there have to be present the electron flows with the energy above 18 eV, what must provide the high rate of the CO2 molecules conversion via direct electron impact. Slow electrons produced inside the negative glow itself have to supply an additional contribution to the conversion process and to make an efficient excitation of oscillatory levels of CO2 molecules.

show abstract

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

Cited by 23 publications

References 11 publications

Investigation on the similarity law of low-pressure glow discharges based on the light intensity distributions in geometrically similar gaps

Investigation on the similarity law of low-pressure glow discharges based on the light intensity distributions in geometrically similar gaps

Why do aged fluorescent tubes flicker?

Glow Discharge With a Hollow Cathode in Carbon Dioxide

Contact Info

Product

Resources

About