碳纳米管阴极强流脉冲发射放气质谱分析
Outgassing mass spectrum analysis with intense pulsed emission of carbon nanotube cathode
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摘要: 借助2MeV直线感应加速器注入器平台,利用四极质谱仪研究了碳纳米管阴极的强流脉冲发射放气质谱特性.研究结果表明:在脉冲高压电场下,碳纳米管阴极材料释放出较多的吸附气体,解吸气体又以CO2,N2(CO),H2三种气体居多,这些解吸气体在阴极等离子体形成过程中起着重要的作用.通过分析解吸气体成分的含量,证明碳纳米管阴极强流脉冲电子发射过程为场致等离子体发射,而不是场致爆炸发射.Abstract: The outgassing mass spectrum property with intense pulsed emission of the carbon nanotube(CNT) cathode is investigated on a 2 MeV linear induction accelerator injector by using the quadrupole mass spectrometer.The results show that the cathode has a capability of desorbing gases from the CNT cathode under pulsed high voltage.There are significant CO2,N2(CO) and H2 desorbing gases which play an important role in the formation of the cathode plasma.The mechanism of electron emission of CNT cathode is plasma-induced field emission,rather than explosive field emission,which is proved by analyzing the desorbed gases component.
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