长脉冲强流碳纳米管阴极重频发射特性初步研究

Preliminary study on long pulse repetitive high current emission characteristic of carbon nanotubes cathode

在不锈钢环形阴极基体上,采用高温热解方法直接生长石墨化程度较高的碳碳纳米管阴极,当脉冲电压达到800k V时,发射相对论电子束流强度高达9.1k A;以5Hz重复频率发射模式时,发射稳定、其发射阈值介于石墨不锈钢阴极之间而等离子体扩张速度最低;多次发射后,界面无脱附现象发生。

On the stainless steel circle cathode, graphitzing carbon nanotube(CNTS) films were synthesized by pyrolysis. If the long pulse was up to 0.80 MV, the emission relativity beam current was 9.1k A. When the high-current emission repetitive frequency was 5Hz, the threshold electrical field was lawer than graphite cathode but higher than stainless steeel cathode, the emission was stabilization and the plasma divergence speed was minimum.After multiple emission, the morphology of CNTS was intact, the desorption from the interface of CNTs with the basal body wasn't occur.