摘要
为了进行强流多电子束源研究,对现有2MeVLIA注入器进行了四脉冲改造,二极管脉冲电压约500kV。实验研究了天鹅绒阴极在四脉冲条件下的发射能力、传导电流负载效应以及阴极等离子体运动对阴极电子发射和束能量的影响。利用空间电荷限制流模型推算出阴极等离子体膨胀速率在1～4cm/μs之间。
A four pulsed voltage system (FPVS) has been built based on a 2 MeV linear induction accelerator (LIA) injector. With the FPVS, some research on the multi-pulsed vacuum diode was taken. The pulse duration is 100 ns and pulse to pulse duration is less than 500 ns. The pulsed diode voltages are around 500 kV. The work on multi-pulse emitting characteristics of velvet cathode is introduced. The CCD photos of emitting cathode indicate that the velvet cant emit electrons uniformly under multi-pulse condition. The effects of beam load and cathode plasma to multi-pulse emitting and beam to beam electron energy dispersion are also discussed. The experimental results indicate that the cathode plasma can reduce the effective distance between cathode and anode of diode. With the space charge limited mode, the explosion velocity of cathode plasma is 1-4 cm/μs.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2004年第2期251-255,共5页
High Power Laser and Particle Beams
基金
国防科技基础研究基金资助课题
