Abstract

The behavior of explosive emission cathode plasma was a fundamental physical problem in the study of high current electron beam diode. A diagnosis system was designed for getting the time-resolved and spectrum-resolved emission spectra of cathode plasma on a 1MV diode with dozens of kilo amperes in this paper. A full spectrum of direct reading spectroscopic diagnostic system which includes a high band pass spectrograph with 200–1000nm detection wavelength and an ultra high-speed intensified imaging with 2ns gate time was used in the experiment. The characteristics of emission spectra in different stages during the process of cathode plasma of several cathode materials were obtained. These results are helpful for improving the uniformity of cathode plasma emission in high current diode by choosing suitable surface treatment method of cathode.

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