Measurement of electron beam transverse slice emittance using a focused beamline  

作　　者：Kangnan Jiang Ke Feng Hao Wang Xiaojun Yang Peile Bai Yi Xu Yuxin Leng Wentao Wang Ruxin Li 

机构地区：[1]State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-intense Laser Science,Shanghai Institute of Optics and Fine Mechanics(SIOM),Chinese Academy of Sciences(CAS),Shanghai,China [2]School of Physical Science and Technology,ShanghaiTech University,Shanghai,China

出　　处：《High Power Laser Science and Engineering》2023年第3期41-47,共7页高功率激光科学与工程（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos. 11991072, 11875065 and 12105353);the CAS Project for Young Scientists in Basic Research (YSBR060);the State Key Laboratory Program of the Chinese Ministry of Science and Technology;the CAS Youth Innovation Promotion Association (Nos. Y201952 and 2022242)

摘　　要：A single-shot measurement of electron emittance was experimentally accomplished using a focused transfer line with a dipole.The betatron phase of electrons based on laser wakefield acceleration(LWFA)is energy dependent owing to the coupling of the longitudinal acceleration field and the transverse focusing(defocusing)field in the bubble.The phase space presents slice information after phase compensation relative to the center energy.Fitting the transverse size of the electron beam at different energy slices in the energy spectrum measured 0.27 mm mrad in the experiment.The diagnosis of slice emittance facilitates local electron quality manipulation,which is important for the development of LWFA-based free electron lasers.The quasi-3D particle-in-cell simulations matched the experimental results and analysis well.

关 键 词：beam diagnostic EMITTANCE laser wakefield acceleration 

分 类 号：TN24[电子电信—物理电子学]