强流碳纳米管阴极重复频率发射特性

采用钛氰铁高温催化热解方法可制备发射性能优异的碳纳米管薄膜阴极。当脉冲电场峰值达到30 MV/m时,发射电流密度达kA/cm2以上,对应相对论电子束流强度高达15 kA,等离子体发射机制参与电子束发射过程。以重复频率10 Hz发射模式时,其发射阈值低,束压、束流波形跟随性好,发射稳定性优于石墨阴极。发射发次达到1000后,碳纳米管形态依然完整,界面无脱附。

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

After the problem of damping effect on the nanotubes and the substrate was settled, Carbon nanotubes (CNT) films with champion emission characteristic would be synthesized by pyrolysis of iron phthalocyanine. If the pulse electrical field was up to 30 MV/m, the emission relativity beam current was 15 kA, the corresponding current density exceeded 1 kA/cm2 and the potential emission mechanism was flashover plasma emission. When the high-current emission repetitive frequency was 10 Hz, the emission threshold electrical field was low, the current waveform was almost synchronized with the voltage waveform, the emission amplitude was equal, the extent of emission stabilization was better than that of graphite cathode. After the emission times were up to 1000 shots, the morphology of CNT was intact, the desorptions from the interface of CNT didnt occur.