GENERATION OF SHORT THZ BUNCH TRAINS IN A RF PHOTOINJECTOR
GENERATION OF SHORT THZ BUNCH TRAINS IN A RF PHOTOINJECTOR
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DOI：
10.1016/j.nima.2007.04.129
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发表时间：
2007-07
影响因子：
1.4
通讯作者：
M. Boscolo;M. Ferrario;I. Boscolo;F. Castelli;S. Cialdi
中科院分区：
文献类型：
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作者：
M. Boscolo;M. Ferrario;I. Boscolo;F. Castelli;S. Cialdi
一个射频电子枪连接到一个压缩机可以产生序列太赫兹亚皮秒电子脉冲的激光脉冲照射的光电阴极。假设一个快速的电子发射，每个激光脉冲在阴极产生一个电子盘。所述磁盘序列演变为具有特殊锯齿状能量调制的稍微调制的段塞。这种能量调制在速度聚束压缩器内转化为密度调制，在很大程度上恢复了初始的多磁盘轮廓。通过仿真分析了电子束的演化过程，考察了电子束演化过程与激光脉冲特性、频率特性和加速器参数的关系。
A radiofrequency electron gun joined to a compressor can generate trains of THz sub-picosecond electron pulses by illuminating the photocathode with trains of laser pulses. Assuming a prompt electron emission, each laser pulse generates an electron disk at the cathode. The disk train evolves toward a slightly modulated slug having a peculiar sawtooth energy modulation. This kind of energy modulation is transformed into a density modulation within a velocity-bunching compressor recovering at a good extent the initial multi-disk profile. The electron beam evolution is analyzed through simulations looking at its features as function of pulse and frequency characteristics of the laser and of the accelerator parameters.