Intense pulsed emission of velvet and carbon nanotube cathodes
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摘要: 在2 MeV直线感应加速器注入器平台上开展了天鹅绒阴极与碳纳米管阴极的强流脉冲发射特性综合实验。研究结果表明:天鹅绒阴极与碳纳米管阴极均具有强流脉冲发射性能,在1.61 MV的二极管电压下,天鹅绒阴极与碳纳米管的发射电流密度分别为84,108 A/cm2;启动时间分别为21,40 ns;放气量分别为0.29,0.91 PaL;放出气体分子数目与发射电子数目之比分别为64,225;两种冷阴极强流脉冲发射时的放气质谱相似。Abstract: Experiments on intense pulsed emission properties of velvet and carbon nanotube(CNT) cathodes have been conducted on the 2 MeV linear induction accelerator injector. The results show that both velvet and CNT cathodes can emit intense electron beams under 1.61 MV pulsed high voltage. The intense electron beams are 84 and 108 A/cm2 in current density, and the turn-on times are 21 and 40 ns, respectively. The amount of outgassing is estimated to be 0.29 and 0.91 PaL, and the number of outgassed molecules per electron is 64 and 225 for velvet and CNT cathodes. Moreover, the outgassing mass spectra of the two cathodes are similar to each other.
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Key words:
- velvet cathode /
- carbon nanotube cathode /
- intense pulsed emission /
- outgassing
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