Formation of inverse electron distribution function and absolute negative conductivity in nonlocal plasma of a dc glow discharge

Yuan, Chengxun; Yao, Jingfeng; Bogdanov, E. A.; Kudryavtsev, A. A.; Zhou, Zhongxiang

doi:10.1103/physreve.101.031202

Cited by 16 publications

(23 citation statements)

References 22 publications

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“…Transition between these regions may be accompanied by a number of interesting kinetic effects. For example, in a recent theoretical study it has been shown that the FDS-PC transition may provide conditions for reversal of EDF and negative electron conductivity in case of glow discharges in noble gases [51].…”

Section: Resultsmentioning

confidence: 99%

Longitudinal structure and plasma parameters of an entire DC glow discharge as obtained using a 1D fluid-based model with non-local ionization

Yao

Yuan

Eliseev

et al. 2020

Plasma Sources Sci. Technol.

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We present a model of a direct-current glow discharge that self-consistently reproduces its full longitudinal structure and provides reliable estimates of main discharge parameters in all of its regions. The model is based on the fluid description of ions and bulk electrons and incorporates analytical formulation of non-local ionization and excitation sources induced by fast electrons. Spatial distributions of main discharge parameters obtained for the case of an extended glass tube filled with argon at 0.5 Torr show pronounced near-cathode regions-the cathode sheath, the negative glow and the Faraday dark space-as well as the autonomous positive column and the anode sheath. Formation of the second electric field reversal and the transitional region between the Faraday dark space and the positive column are revealed. This transitional region occupies a considerable fraction of the discharge tube length, over which the bulk electron temperature increases by more than an order of magnitude. Comparison of simulation results with those obtained with a 2D fluid model with the local energy approximation, as well as with experimental data taken from literature is presented. The model can be realised in most modern low-temperature plasma simulation software. The underlying physics and assumptions are discussed in detail.

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Section: Resultsmentioning

confidence: 99%

Longitudinal structure and plasma parameters of an entire DC glow discharge as obtained using a 1D fluid-based model with non-local ionization

Yao

Yuan

Eliseev

et al. 2020

Plasma Sources Sci. Technol.

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show abstract

“…The proof of this fact is provided in the appendix for a general 3D case. Note also that although Coulomb collisions not considered here, accounting for them would retain the equation (18). The validity of ( 18) can be seen from figures 3-5.…”

Section: Model Descriptionmentioning

confidence: 88%

“…figures 1-3 in [6], figures 1-4 in [11], figures 1-3 in [12], figures 1 and 2 in [13]). However, within the local approximation, dF 0 /dw w=0 = 0 at the nonzero electric field, (for more information, see [17,18]). So, the unusual behavior of the EEDF observed in some previous works [6,[11][12][13]] also signals the unreliability of the utilized computational procedures.…”

Section: Introductionmentioning

confidence: 99%

Features of the EEDF formation in the dusty plasma of the positive column of a glow discharge

Li¹,

Rabadanov²,

Bogdanov³

et al. 2021

Plasma Sources Sci. Technol.

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In this paper, the formation of the electron energy distribution function (EEDF) in the argon dusty plasma of the positive column of glow discharge at low pressure is investigated. A model for calculating EEDF in the local approximation is adapted to find the nonlocal EEDF via the Holstein–Tsendin model. The results show that, contrary to the prevalent opinion in the literature, the presence of dust has little effect on the EEDF up to the limiting values of the density of dust particles that can be injected into the plasma for the considered conditions. It is also shown that, when obtaining the nonlocal EEDF, the spatial profiles of the axial (heating) and radial (ambipolar) fields should be chosen from a self-consistent solution. Additionally, the differences between the local and nonlocal EEDFs increase in the peripheral regions of the discharge due to a sharp decrease of fast electrons in the nonlocal case. Significant changes in the form of the nonlocal EEDF along the radius also lead to noticeable changes in other characteristics of the electrons in this area, especially for those with a large energy threshold (e.g. due to excitation, ionization).

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“…In Figure 6, it can be seen that some attenuation values of electromagnetic wave for plasma in the post-anode space of the GA-CP are positive. We believe that the negative conductivity of the plasma space behind the anode in some frequency ranges may result in an electromagnetic wave gain rather than attenuation [54], [55].…”

Section: Figures 4(b) and 5(b) Show That The Voltage Values Atmentioning

confidence: 95%

Attenuation of Microwave Radiation by Post-Anode Plasma in a Composite Grid Electrode Structure

et al. 2022

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This paper presents a new composite grid electrode structure for the generation of plasma that is suitable for modeling microwave radiation transmission through atmospheric plasma. The new grid anode-composite cathode (GA-CC) structure is to be contrasted with the ordinary grid anode-cathode plate (GA-CP) structure. It is found that the breakdown voltage of the new GA-CC electrode structure is lower than that of the GA-CP structure and is a bit shifted to the right on the Pd-axis. An advantage of the GA-CC structure over the GA-CP structure is that it requires a lower voltage to generate the same current. It is found that plasma generated by the new GA-CC structure selectively strengthens electromagnetic waves attenuation in the frequency range of 9-12 GHz.

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Formation of inverse electron distribution function and absolute negative conductivity in nonlocal plasma of a dc glow discharge

Cited by 16 publications

References 22 publications

Longitudinal structure and plasma parameters of an entire DC glow discharge as obtained using a 1D fluid-based model with non-local ionization

Longitudinal structure and plasma parameters of an entire DC glow discharge as obtained using a 1D fluid-based model with non-local ionization

Features of the EEDF formation in the dusty plasma of the positive column of a glow discharge

Attenuation of Microwave Radiation by Post-Anode Plasma in a Composite Grid Electrode Structure

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