A.A. Trenkin - Ph.D. (Phys.-Math.), Leading Research Scientist, State Corporation on Atomic Energy «Rosatom», Federal State Unitary Entity «Russian Federal Nuclear Center - All-Russian Scientific and Research Institute of Experimental Physics» (RFNC-VNIIEF), (Sarov, Nizhny Novgorod region). E-mail: trenkin@ntc.vniief.ru

The paper presents a calculation model to study the dynamics of the charged particles transfer processes under effect of the external electric field in the collisional channel systems in approximation of perfectly elastic reflection from the channel wall. Such processes could take place in a low-temperature plasma, gas discharges, electrolytes, etc. Electrons, ions and also macroscopic particles (dust, for example) could be the charged particles. So, perfectly elastic reflection could take place both in the result of mechanical interaction of a particle with uncharged dense wall, and in case of Coulomb interaction of the particles with charged channel boundary. By the example of the electrons motion in the air, we found the effect of average directed electrons velocity increase both at decrease of the channel thickness and neutral gas density. Growth of the electrons interaction frequency with the channel walls, taking place without loss of the directed velocity component, is the reason of the directed velocity increase. This effect becomes significant when the channel diameter becomes comparable to the electron free length. Possibility of "boundary" acceleration of the electrons in case of wide channels is shown. In this case, group of the electrons moves near the channel boundary, accelerates due to the interaction with the wall, and forms a hollow beam. It is shown that the studied systems belong to the class of the super-diffusion (persistent) dynamic systems when the electron motion character occupies the intermediate position between the stochastic and linearly accelerated characters.

 

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