Paper Title
Effect of Hollow Anode Depth on Some Characteristics and Parameters of Argon Glow Discharge Plasma

Abstract
An experimental investigation of hollow anode argon glow discharge plasma has been carried out at different argon gas pressure ranged from2.2×10−2𝑡𝑜 3𝑚𝑏𝑎𝑟 for constant discharge current .The experiments were conducted firstly to measure the breakdown voltage and Paschenc's law under the influence of hollow depth. Secondly electric probes and a computer MATLAB program are used for obtaining the temperature and density of electrons in the negative glow region from the double probes (Ip-Vp) characteristics. It was found from the results that the measured Pashence's curve closes to the well-known theoretical Pashence's law. The voltage breakdown and its minimum breakdown voltage decrease due to increasing the depth of hollow cylindrical. Increasing the hollow anode depth, the Paschen’s curve is widen and shifted to lower pressure. A dens and luminous intensity of plasma occurs in the negative glow region due to reduction area of hollow anode depth. Both electron temperature and density of electron are decreases due to increasing the depth. Index Terms - Hollow anode depth, argon glow discharge, double probes, plasma parameters, negative glow region