Study of directed ion velocities in a vacuum arc by an emission method

Бугаев, А. С.; Gushenets, V. I.; Nikolaev, A. G.; Окс, Е. М.; Yushkov, G. Yu.

doi:10.1134/1.1318098

Cited by 33 publications

(13 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, the voltage fluctuations at a pressure higher than 50 Pa decrease to 1 V sharply. This fact is confirmed by the experiments described in 8 [33,34], that show that the increase in a pressure leads to a significant reduction in a velocity of electrons and vapor-plasma jets.…”

Section: Resultssupporting

confidence: 74%

Plasma-chemical synthesis of copper oxide nanoparticles in a low-pressure arc discharge

Uschakov

Карпов

Лепешев

et al. 2016

Vacuum

View full text Add to dashboard Cite

Abstract. The influence of a pressure of gas mixture (10 vol% O 2 + 90% N 2 ) on an average size of copper oxide nanoparticles, produced in the plasma of low pressure arc discharge, has been studied as a basic process variable. A correlation between the dependence of average particle size on gas mixture pressure and the dependence of discharge gap voltage on product of interelectrode distance by a gas mixture pressure, has been found. The estimation was carried out by means of X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). A mathematical model of the cathode region, which shows the applicability of the similarity theory to the low pressure arc discharge, has been represented.

show abstract

Section: Resultssupporting

confidence: 74%

Plasma-chemical synthesis of copper oxide nanoparticles in a low-pressure arc discharge

Uschakov

Карпов

Лепешев

et al. 2016

Vacuum

View full text Add to dashboard Cite

show abstract

“…Recently, Krasov and Paperny [43] established a theoretical model for the expansion of multicomponent plasma jets into vacuum, which was tested on experimental literature data available for vacuum cathodic arcs [8,21,23,44]. Based on ion−ion friction in the vicinity of the emission region, the model predicts an equalization of the velocities of ions with different mass and/or charge.…”

Section: Effects On Velocity Distributionsmentioning

confidence: 99%

Time-resolved ion energy and charge state distributions in pulsed cathodic arc plasmas of Nb−Al cathodes in high vacuum

Zöhrer

Anders

Franz

2018

Plasma Sources Sci. Technol.

View full text Add to dashboard Cite

Cathodic arcs have been utilized in various applications including the deposition of thin films and coatings, ion implantation, and high current switching. Despite substantial progress in recent decades, the physical mechanisms responsible for the observed plasma properties are still a matter of dispute, particularly for multi-element cathodes, which can play an essential role in applications. The analysis of plasma properties is complicated by the generally occurring neutral background of metal atoms, which perturbs initial ion properties. By using a time-resolved method in combination with pulsed arcs and a comprehensive Nb−Al cathode model system, we investigate the influence of cathode composition on the plasma, while making the influence of neutrals visible for the observed time frame. The results visualize ion detections of 600 μs plasma pulses, extracted 0.27 m from the cathode, resolved in mass-per-charge, energy-per-charge and time. Ion properties are found to be strongly dependent on the cathode material in a way that cannot be deduced by simple linear extrapolation. Subsequently, current hypotheses in cathodic arc physics applying to multi-element cathodes, like the so-called 'velocity rule' or the 'cohesive energy rule', are tested for early and late stages of the pulse. Apart from their fundamental character, the findings could be useful in optimizing or designing plasma properties for applications, by actively utilizing effects on ion distributions caused by composite cathode materials and charge exchange with neutrals.

show abstract

“…These features of the cathode spot as a physical object impede its experimental investigation. In this connection, methods of corpuscular diagnostics, in particular the emission method [7,8], seem to offer, perhaps, a solely probable approach for studying experimentally the processes in a cathode spot. The idea of the method is to study of the response of the charge state distribution of the ions extracted from the emission boundary located far away from the cathode spots of a vacuum arc to the action of which the discharge is subjected.…”

Section: The Emission Methods For Investigating Ion Velocitiesmentioning

confidence: 99%

“…The extracted ions were accelerated in multiaperture acceleration/deceleration system 5 by dc voltage of 10-30 kV. Subsequently the charge state constitution of ion flow 6 was analyzed by a time-of-flight mass spectrometer [9,10].…”

Section: The Emission Methods For Investigating Ion Velocitiesmentioning

confidence: 99%

“…The emission methods developed by us to investigate the processes in a vacuum arc discharge [7,8] involve the determination of plasma parameters and characteristics based on the analysis of the ion current extracted from the plasma and its charge states. In this paper, the results of the determination of directional velocities of ions in a vacuum arc and their comparison with predicted values are given, allowing a conclusion about the mechanism of the acceleration of ions in a vacuum arc.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Emission Methods of Experimental Investigations of Ion Velocities in Vacuum Arc Plasmas

Бугаев

Gushenets

Nikolaev

et al. 2002

Emerging Applications of Vacuum-Arc-Produced Plasma, Ion and Electron Beams

Self Cite

View full text Add to dashboard Cite

Abstract. This paper is devoted to an investigation of the directional velocities of the ions generated in cathode spots of vacuum arc discharges. Using emission methods of studying the processes in a vacuum arc discharge, which involve the determination of the parameters and characteristics of the discharge plasma by analyzing the ion current extracted from the plasma and the ion charge states, the velocities of ions have been determined for the majority of cathode materials available in the periodic table. Is has been shown that at a low pressure of the residual gas in the discharge gap the directional velocities of the ions do not depend on the ion charge state. Comparison of the data obtained with calculated values allows the conclusion that the acceleration of ions in a vacuum arc occurs by the magnetohydrodynamic mechanism.

show abstract

Study of directed ion velocities in a vacuum arc by an emission method

Cited by 33 publications

References 10 publications

Plasma-chemical synthesis of copper oxide nanoparticles in a low-pressure arc discharge

Plasma-chemical synthesis of copper oxide nanoparticles in a low-pressure arc discharge

Time-resolved ion energy and charge state distributions in pulsed cathodic arc plasmas of Nb−Al cathodes in high vacuum

Emission Methods of Experimental Investigations of Ion Velocities in Vacuum Arc Plasmas

Contact Info

Product

Resources

About