LAUSR

Abstract The parameters and characteristics of a pulsed constricted arc discharge operating in the forevacuum pressure plasma-cathode source of a large-radius (about 4 cm) low-energy (up to 10 keV) electron beam are presented. The constricted arc discharge is characterized by a rising current-voltage characteristic. Increase in gas pressure and the use of gas with greater ionization cross section lead to a decrease in arc voltage. We have determined the dependences of the maximum stable arc current on the operating conditions, and explored the emission properties of the plasma. Efficient electron emission from this plasma over the pressure range 5–21 Pa, and the influence of the beam generation processes on the constricted arc discharge have been demonstrated. A pulsed electron beam with current up to 20 A and energy up to 10 keV has been obtained using a forevacuum-pressure plasma-cathode electron source based on a constricted arc discharge.