Enhanced terahertz generation via plasma modulation on two bunches  

作　　者：Hanqi Feng Fang Liu Lixin Yan Wenhui Huang Kaiyu Cui Xue Feng Wei Zhang Yidong Huang 

机构地区：[1]Tsinghua University,Department of Electronic Engineering,Beijing,China [2]Tsinghua University,Department of Engineering Physics,Beijing,China

出　　处：《Advanced Photonics Nexus》2024年第4期152-158,共7页先进光子学通讯（英文）

基　　金：supported by the National Key Research and Development Program of China(Grant No.2023YFB2806703);the National Natural Science Foundation of China(Grant Nos.U22A6004,62301294,and 11835004);was funded by the National Key Laboratory of Science and Technology on Vacuum Electronics.

摘　　要：Terahertz(THz)radiation finds important applications in various fields,making the study of THz sources significant.Among different approaches,electron accelerator-based THz sources hold notable advantages in generating THz radiation with narrow bandwidth,high brightness,high peak power,and high repetition rate.To further improve the THz radiation energy,the bunching factor of the free electron bunch train needs to be increased.We propose and numerically reveal that,by adding an additional short-pulse drive beam before the main beam as the excitation source of nonlinear plasma wake,the bunching factor of the main beam can be further increased to∼0.94,even though with a relatively low charge,low current,and relatively diffused electron beam.Two such electron beams with loose requirements can be easily generated using typical photoinjectors.Our work provides a way for a new THz source with enhanced radiation energy.

关 键 词：terahertz radiation electron bunch train plasma wakefield bunching factor 

分 类 号：TN2[电子电信—物理电子学]