Abstract
Electron-neutral collision processes in helium DC normal and abnormal discharges have been studied using Monte-Carlo simulation (MCS). Four types of collisions (elastic, metastable excitation, excitation and ionization collision) are considered. Comparing normal discharge with abnormal discharge, we find that the number of collisions decreases and the collision rates increase through the cathode region in abnormal discharge. The collision rates calculated from electron instantaneous energy is different than that calculated from electron mean energy. The results also show that the elastic collision is the greatest proportion and plays an important role in electron-neutral collision processes in the cathode fall region. The effects of collision on the electron mean energy is also studied.
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