Nonlocal phenomena in the positive column of a medium-pressure glow discharge

Paradoxical Nonmonotonic Behavior of Excitation-Rate Spatial Profiles in Bounded Plasmas

“…The traditional local approach (1) is valid, if the characteristic scale determined by the gap spacing L exceeds " [2,3]. As it was already mentioned, in this case averaged excitation frequencies k constx.…”

“…Nevertheless, in simulations [2] of the PC in Ar, the surprising phenomenon revealed, that excitation and direct ionization rates and densities of exited atoms were maximal not at the tube axis, but somewhere at its periphery. In [2] it was pointed out that such paradoxical phenomena are caused by the nonlocal electron kinetics [3][4][5].…”

“…In [2] it was pointed out that such paradoxical phenomena are caused by the nonlocal electron kinetics [3][4][5]. The related phenomena were seemingly observed in experiments and simulations [6,7].…”

“…In order to clarify the underlying physics, instead of the self-consistent problem [2,8] we would consider the model problem for the planeparallel geometry with the gap spacing 2L: The transversal and axial electric fields were considered as free parameters. Their values were chosen to the results of the self-consistent calculations.…”

Influence of Discharge Parameters on Radial Distributions of Charge Particles in Positive Column in Narrow Gas Discharge Tubes

“…The main aim of the present paper is to examine radial distributions of charged particles in the gas discharge plasma of PC in narrow tubes without condition of the quasineutrality of plasma and as well as condition of the constant ratio of ions and electrons concentrations on radial coordinates. It is assumed that the electron and gas temperatures are constants (that is local approximation for electron energy [3,4]). The pressure of neutral gas is sufficiently high for the mean free paths to be small compared to tube radius.…”