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Abstract
Annular electron beam which can be obtained by cylindrical ferroelectric cathode could achieve stable transmission and beam-wave conversion with high efficiency in high power microwave device. Besides, cylindrical ferroelectric cathode may obtain intense emission current and high density plasma due to the sample's large emission surface area.
This article makes a research of electron emission characteristic of cylindrical ferroelectric cathode. In experiment, lanthanum- doped lead zirconate titanate ceramic is introduced to manufacture thin cylinder. And then, in method of sintering silver, exterior wall is made into full electrode which is set as rear electrode, whereas, interior wall is made into grid electrode as inner electrode. High voltage pulse source used between rear to inner electrode and DC bias voltage used between graphite collector to inner electrode are set as trigger and extraction voltage, respectively.
The research puts emphasis on the change of electron emission intensity with trigger voltage and extraction voltage. Secondly, we analyze and discuss experiment phenomenon. Finally, we observe discharge in cylindrical cathode and record the section of emission current.
Acknowledgments
This work was supported by the National Science Foundation of China (Grant No. 10875095) and the National Natural Science Foundation of China-NSAF (Grant No. 10976022).