Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8044883 | Vacuum | 2016 | 4 Pages |
Abstract
High-current electron beam cathodes based on SiC nanowires have been successfully fabricated. The emission properties of the cathodes were performed in a single high-voltage pulse generator (450Â kV, 120Â ns) and a repetitive one (300Â kV, 6Â ns, 100Â Hz), respectively. In a single-pulse regime, the high intensity emission from the cathode was obtained and the highest emission current density reached about 1.17Â kA/cm2 at an electric field of 90Â kV/cm. Emission optical images proved that the formation of plasma on the cathode surface induces the enhancement of electron emission, suggesting the production mechanism of the high current is an explosive electron emission. Under repetition rate mode, typical results of discharge waveforms of 100Â Hz are presented, and the pulse-to-pulse instability of the cathode current was below 3.43%. The pressure boost during the pulse series was below 1.4Â ÃÂ 10â2Â Pa. The SiC nanowire cathodes appear to be suitable for high-power microwave source applications.
Related Topics
Physical Sciences and Engineering
Materials Science
Surfaces, Coatings and Films
Authors
Tao Xun, Xue-long Zhao, Gong-yi Li, Tian-jiao Hu, Jie Yang, Han-wu Yang, Jian-de Zhang,