Modeling of kinetics of macrochanneling of fast electrons and ions in planar gap collimators

Using the novel method of macroscopic computer simulation of the reflection of charged particles from solid surfaces at grazing incidence the kinetics of planar macrochanneling, the directed transport of particles between surfaces separated by macroscopic distance, has been studied for swift electrons and ions. The dechanneling functions at macrochanneling have been calculated for the first time. The modeling of angular distributions of particles has confirmed the effect of beam angular splitting at the exit of macrochannel. The method of the taking into account of surface atomic discreteness at modeling of coherent effects of ion planar semichanneling has been developed. It has been shown that due to stochastic effects of particles reflection the macrochanneling of electrons in long channels is actually reduced to the effects of beam collimation while for ions the coherent effect allows to stabilize the macrochanneling and to achieve the beam transportation at long distances without considerable losses of intensity