Electric potential profile created by end electrodes in a magnetized rf discharge plasma

Liziakin, G. D.; Gavrikov, A. V.; Usmanov, R. A.; Timirkhanov, R. A.; Smirnov, V. P.

doi:10.1063/1.4998806

Cited by 18 publications

(13 citation statements)

References 27 publications

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“…It can decrease by 2 orders of magnitude over several centimetres (Liziakin et al. 2017), and replacing such a profile with a uniform one can significantly distort the real picture. The good agreement between the calculated profiles and the experiment in the current study is largely due to the fact that the density profile in the experiment was quite flat.…”

Section: Discussionmentioning

confidence: 99%

“…It is necessary to distinguish between cases when the negative potential (Liziakin et al. 2017) (relative to the outer cylindrical surface) and the positive one (Shinohara & Horii 2007) are maintained on the cylinder axis. The difference between these cases consists primarily of the difference between the areas of the negative and positive electrodes.…”

Section: Introductionmentioning

confidence: 99%

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Radial distribution of the plasma potential in a cylindrical plasma column with a longitudinal magnetic field

et al. 2021

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The possibility of controlling the electrostatic field distribution in plasma has yielded wide prospects for modern technologies. As a magnetic field primarily allows for creating electric fields in plasma, it serves as an additional obstacle for the current flow through a medium. In the present paper, an axially symmetric system is considered in which the magnetic field is directed along the axis and concentric electrodes are located at the ends. The electrodes are negatively biased. A model which solves the problem of the radial distribution of the plasma potential inside the cylindrical plasma column supported by the end electrodes is proposed. The most commonly encountered configurations of the electrical connection for the end electrodes are considered, and the particular solutions to the problem of the radial distribution are presented. The contribution of ions and electrons to the transverse conductivity is evaluated in detail. The influence of a thermionic element on the radial profile of the plasma potential is considered. To verify the proposed model, an experimental study of the reflex discharge is carried out with both cold electrodes and a thermionic element on the axis. A comparison of the computational model results with experimental data is given. The presented model makes it possible to solve the problem concerning the plasma potential distribution in the case of an arbitrary number of end electrodes, and also to take into account the inhomogeneity of the distribution of plasma density, neutral gas pressure and electron temperature along the radius.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Radial distribution of the plasma potential in a cylindrical plasma column with a longitudinal magnetic field

et al. 2021

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“…In a similar configuration, negative electric fields were produced with localised negative bias using emissive electrodes 86 . Recently, Liziakin et al showed that end-electrodes effectiveness to affect the potential increased with the electrodes' area, both in reflex 95 and RF 96 discharges.…”

Section: A Foundations For Driving Crossed-field Flows Via Electrode ...mentioning

confidence: 99%

ExB flows for high-throughput plasma mass separation

Gueroult¹,

Zweben²,

Fisch³

et al. 2018

Preprint

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High-throughput plasma separation based on atomic mass holds the promise for offering unique solutions to a variety of high-impact societal applications. Through the mass differential effects they exhibit, crossed-field configurations can in principle be exploited in various ways to separate ions based on atomic mass. Yet, the practicality of these concepts is conditioned upon the ability to drive suitable crossed-field flows for plasma parameters compatible with high-throughput operation. Limited current predictive capabilities have not yet made it possible to confirm this possibility. Yet, past experimental results suggest that end-electrodes biasing may be effective, at least for certain electric field values. A better understanding of cross-field conductivity is needed to confirm these results and confirm the potential of crossed-field configurations for high-throughput separation.

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“…In such configuration, the entire plasma starts rotation [46,47]. There are two types of systems: systems in which the end electrodes participate in the process of maintaining the discharge and systems in which the discharge is created by an external source of energy [48,49]. The connection between the discharge parameters and the plasma potential on the axis in such a system was shown in experiments with a reflex discharge [50] and in the theoretical research [51].…”

Section: Introductionmentioning

confidence: 99%

Plasma mass separation in configuration with potential well

Liziakin¹,

Антонов²,

Smirnov³

et al. 2021

J. Phys. D: Appl. Phys.

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The details of the charged particle separation by mass in the configuration with axial magnetic and radial electric fields are studied. The radial electric field, oriented to the discharge axis, is induced in a background reflex discharge with a hot cathode (−550 V, 8–14 A). The plasma source is based on a hot cathode arc discharge with independent metal vapor injection (18–21 V, 30 A) was situated at 18 cm from the axis. It was shown that the separated Ag + Pb mixture is transported across the magnetic field under the background discharge electric field. Effective separation is possible in such a system, while the separation coefficient increases from 4.9 to 6.2–8.4 when the mixture injection point is moved away from the background discharge axis from 18 to 23 cm. The effect of mixture injection on the plasma potential distribution is examined. It was shown that the presence of a plasma source of separated substances can cause a local (1–2 cm) distortion of the background plasma potential profile. Such distortion, as well as fluctuations of the background plasma potential, can significantly affect the width of the deposited spots of separated substances.

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Electric potential profile created by end electrodes in a magnetized rf discharge plasma

Cited by 18 publications

References 27 publications

Radial distribution of the plasma potential in a cylindrical plasma column with a longitudinal magnetic field

Radial distribution of the plasma potential in a cylindrical plasma column with a longitudinal magnetic field

ExB flows for high-throughput plasma mass separation

Plasma mass separation in configuration with potential well

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