天鹅绒阴极发射性能的实验研究
EXPERIMENTAL RESEARCH OF VELVET CATHODES
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摘要: 在长脉冲(50~100ns)和短脉冲(3ns)条件下,我们对天鹅绒阴极的发射性能进行了实验研究。其阴极电流密度分别为400A/cm2和7kA/cm2。
我们分别测量了电流-电压曲线,使用Cherenkov效应得到了阴极发射图象,得到了天鹅绒纤维的扫描电镜照片并测量了天鹅绒阴极的实验结构。在此基础上讨论了天鹅绒阴极的发射机理。Abstract: We have made some experiments to study the emission performance of velvet cathodes with long (120ns, 50ns) and short (3ns) pulses. The cathode current densities are 400 kA/cm2 and 7kA/cm2 respectively.
The voltage-current plot, cathode emission pattern, scanned electron microphotograph and the practical construction of velvet cathodes are presented.
Some ideas about emission mechanism of velvet cathodes have been suggested.-
Key words:
- velvet cathodes /
- relativistic electron beam
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