Electro-optic 3D snapshot of a laser wakefield accelerated kilo-ampere electron bunch  

作　　者：Kai Huang Zhan Jin Nobuhiko Nakanii Tomonao Hosokai Masaki Kando 

机构地区：[1]Kansai Institute for Photon Science(KPSI),National Institutes for Quantum Science and Technology(QST),Kyoto,Japan. [2]Laser Accelerator R&D,Innovative Light Sources Division,RIKEN SPring-8 Center,Hyogo,Japan. [3]SANKEN,Osaka University,Osaka,Japan

出　　处：《Light(Science & Applications)》2024年第5期823-834,共12页光（科学与应用)（英文版）

基　　金：Dr.I.Daito,Dr.T.P.Otsuka,and Dr.Y.Sakai.This work was funded by the JST-Mirai Program Grant No.JPMJMI17A1,Japan,JSPS KAKENHI(No.JP21K17998,No.JP23K17152,No.JP22K12665),Japan and the QST President's Strategic Grant(Exploratory Research),Japan.

摘　　要：Laser wakefield acceleration,as an advanced accelerator concept,has attracted great attentions for its ultrahigh acceleration gradient and the capability to produce high brightness electron bunches.The three-dimensional(3D)density serves as an evaluation metric for the particle bunch quality and is intrinsically related to the applications of an accelerator.Despite its significance,this parameter has not been experimentally measured in the investigation of laser wakefield acceleration.We report on an electro-optic 3D snapshot of a laser wakefield electron bunch at a position outside the plasma.The 3D shape of the electron bunch was detected by simultaneously performing optical transition radiation imaging and electro-optic sampling.Detailed 3D structures to a few micrometer levels were reconstructed using a genetic algorithm.The electron bunch possessed a transverse size of less than 30 micrometers.The current profile shows a multi-peak structure.The main peak had a duration of<10 fs and a peak current>1 kA.The maximum electron 3D number density was~9×10^(21)m^(-3).This research demonstrates a feasible way of 3D density monitoring on femtosecond kilo-ampere electron bunches,at any position of a beam transport line for relevant applications.

关 键 词：laser ACCELERATION field 

分 类 号：TN24[电子电信—物理电子学]