Current-voltage characteristics of a reflex discharge with a hollow cathode and self-heating electrode

Results are presented from experimental studies of the current-voltage char acteristics of a reflex discharge with a self-heating electrode used in a s ource of atomic hydrogen. The processes occurring in a discharge cell and g overning the main features of the characteristics obtained are investigated theoretically. An explanation of the general features of the discharge is proposed. It is shown that an abrupt decrease in the discharge voltage with increasing hydrogen flow rate is associated with penetration of the plasma into the hollow cathode and the ignition of a hollow cathode discharge. It is demonstrated that, as the discharge current increases, the glow dischar ge gradually transforms into an arc discharge with a heated cathode. (C) 20 01 MAIK "Nauka/Interperiodica".