Back diffusion of electrons in argon subjected to uniform time invariant orthogonal electric and magnetic fields

Abstract

In this study, the processes of back diffusion in Ar subjected to crossed fields are analyzed by using the Monte Carlo simulation method in the E/N range of 50 to 500 Td (1 Td = 1 × 10–17 V cm2) for 0 < B/N < 25 × 10−19 T cm3. At a given constant E/N, escape factors decrease with an increasing crossed, reduced magnetic field B/N. This reduction in the escape factor is more pronounced in the lower E/N range. Furthermore, the mean number of collisions of back scattered electrons is quite large, and at a given E/N, the mean number of collisions decreases as the crossed B/N increases.

Suppression of Electron Avalanches in Ultra-Dilute SF6-N2 Mixtures Subjected to Time-Invariant Crossed Fields

“…Figure 7b shows the case in which the magnetic field is increased to a specific magnitude, resulting in inhibition of the electron Energies 2018, 11, 3247 7 of 14 avalanche. The initial loss of free electrons is basically a result of back diffusion as presented by Dincer et al [10,24,30], and attachment collisions in the non-equilibrium region are also possible until a certain time interval, termed the relaxation time, for the electron swarm energy to be in equilibrium is reached. The relaxation time is also observed in Figure 7c from the variation of electron mean energies in the electron swarms.…”

“…The electron energy distributions corresponding to the respective magnitude of crossed magnetic fields displayed in Figure 7d show that, with the increased magnetic fields applied, the peak of the distribution increases and shifts towards the low-energy range, indicating the increased number of slow electrons in the swarm as the magnetic field increases. Dincer et al [10,24,30], and attachment collisions in the non-equilibrium region are also possible until a certain time interval, termed the relaxation time, for the electron swarm energy to be in equilibrium is reached. The relaxation time is also observed in Figure 7c from the variation of electron mean energies in the electron swarms.…”