碳纳米管阴极强流脉冲发射特性实验

Experimental research on intense pulsed emission of carbon nanotube cathode

在2 MeV直线感应加速器注入器平台上研究了采用浸渍涂覆方法制备的大面积碳纳米管阴极发射体的强流发射特性。研究结果表明:在脉冲高压电场下,碳纳米管阴极具有强流电子束发射能力,发射电流密度较大;碳纳米管阴极发射电子过程为场致等离子体发射。实验过程中,阴极端取样电阻环收集到的最大发射电流达350 A,阳极端法拉第筒收集的发射电流为167 A,最大阴极发射电流密度为19.4 A/cm2。

The intense pulsed emission property of the large area carbon nanotube（CNT） cathode made by dipping method has been researched on the 2 MeV linear induction accelerator（LIA） injector.Results show that the CNT cathode has a capability of emitting an intense electron beam and achieving high emission current density under pulsed high voltage.The mechanism of electron emission in the CNT cathode is plasma-induced field emission.In the experiment,the maximal emission currents were 350 A on the sampling resistance ring at cathode and 167 A collected by the Faraday cup at anode.The highest emission current density at cathode was 19.4 A/cm2.