Cathode Plasma Integral Spectroscopy Diagnosis on High Current Pulsed Electron Beam Diode

Cathode plasma is an important factor affecting the cathode emission on high current pulsed electron beam diode. Diagnosing the cathode plasma composition by integral spectrum system is a method for studying the cathode plasma formation and development process. The aim of this paper is to study the cathode plasma composition and analyze the cathode plasma formation mechanism by integral spectroscopic diagnosis of different materials and cathode pretreatments. Experiment results show that not only cathode material itself, but also impurity material and adsorptive gas on cathode surface are found in the cathode plasma. For the same material, the cathode plasma composition remains unchanged, whereas the characteristic line intensity decreases as the experiment times increase. The composition of the cathode plasma can be controlled by adulterated treatment.