TY - JOUR

T1 - Non-local effects in spatial distribution of excitation rates and differential electron fluxes in positive column of glow discharge plasma at moderate and high pressures

AU - Bogdanov, E.A.

AU - Kapustin, K.D.

AU - Kudryavtsev, A.A.

AU - Tsendin, L.D.

PY - 2010

Y1 - 2010

N2 - At simulations of gas-discharge plasmas the EDF is usually calculated using the local approximation (LA) which is applicable only when electron energy relaxation length le $$100*l (l - electron free-path-length), so the LA for EDF is not valid up to high gas pressures. Differential fluxes of electron with defined energy have complicated spatial distribution related to the nonlocal character of the EDF. In case of elastic energy balance of electrons, the direction of the differential electron flux also essentially depends on the energy dependence of the elastic scattering cross section. If this cross-section increases with energy, electrons would increase their energy only on the periphery of the discharge. While near the discharge axis, where the kinetic energy of electrons and hence the frictional force due to elastic collisions is maximum, the differential flow is directed towards reducing the energy, i.e. against the direction of heating electric field. The parado

AB - At simulations of gas-discharge plasmas the EDF is usually calculated using the local approximation (LA) which is applicable only when electron energy relaxation length le $$100*l (l - electron free-path-length), so the LA for EDF is not valid up to high gas pressures. Differential fluxes of electron with defined energy have complicated spatial distribution related to the nonlocal character of the EDF. In case of elastic energy balance of electrons, the direction of the differential electron flux also essentially depends on the energy dependence of the elastic scattering cross section. If this cross-section increases with energy, electrons would increase their energy only on the periphery of the discharge. While near the discharge axis, where the kinetic energy of electrons and hence the frictional force due to elastic collisions is maximum, the differential flow is directed towards reducing the energy, i.e. against the direction of heating electric field. The parado

M3 - Article

VL - 55

SP - 133

JO - Bulletin of the American Physical Society

JF - Bulletin of the American Physical Society

SN - 0003-0503

IS - 7

ER -