Abstract In this work, an improved understanding of electron sheath theory is provided using both fluid and kinetic approaches while elaborating on their implications for plasma–surface interactions. A model proposed considering the presheath structure, avoiding singularity in Child–Langmuir law which overestimates potential. Subsequently, a established, showing considerably different profiles ...

Communication ‘blackout’ is a big challenge for modern space engineering. In the recent decade, the terahertz (THz) technology is believed to be an effective solution for the ‘blackout’ problem. Many research works about the transmission of THz waves in plasma slabs have been carried out. According to those works, the radio attenuation of THz waves in plasma slabs strongly depends on thickness ...

The design and understanding of plasma and its bounding sheath requires an effective modeling technique that is both adaptable to arbitrary geometry and time accurate. We present a finite-element-based model for two-fluid plasma. The continuity and momentum equations for electrons and ions are solved simultaneously with the Poisson equation, using an efficient subgrid-embedded algorithm. The mo...

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The equilibrium, stability, and trapping of dust particles associated with vertical motions in the plasma sheath and pre-sheath are calculated, taking into account the dependence of the variables (such as dust charge, ion flow velocity, etc.) on the local position in the sheath/pre-sheath region of a collisional plasma with an ionization source. It is demonstrated that an increase of the rate o...

Recently great emphasize was put forward into high power Hall thruster development. Among Hall thruster technologies, the thruster with anode layer (TAL) seems to have much wider technical capabilities. In this paper, various aspects of the plasma flow in a high power thruster with anode layer are studied. A model of plasma flow in the TAL channel is developed based on a 2D hydrodynamic approac...

The finite, electrostatically achievable, temporal resolution of plasma properties from a turbulent discharge is limited by an array of effects wherein the theory of Langmuir probes breaks down. Formulations for the particle transit time, sheath formation time, plasma-probe resonance, polarization current, sheath capacitance, stray capacitance, and mutual capacitance effects are all evaluated f...

The location of the plasma sheath edge, where quasineutrality is broken, is rigorously derived by using a kinetic description of the plasma. It is shown that sheaths can exist with arbitrarily small ion velocity at the sheath edge, thus violating the Bohm criterion, V(i)=c(s) at the sheath edge. Bohm's criterion is recovered in the case of large enough ion current through the wall, and it is fo...