Generation of polarized electron beams through self-injection in the interaction of a laser with a pre-polarized plasma  

作　　者：L.R.Yin X.F.Li Y.J.Gu N.Cao Q.Kong M.Büscher S.M.Weng M.Chen Z.M.Sheng 

机构地区：[1]Key Laboratory of Nuclear Physics and Ion-beam Application(MoE),Institute of Modern Physics,Department of Nuclear Science and Technology,Fudan University,Shanghai,China [2]State Key Laboratory of High Field Laser Physics,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai,China [3]SANKEN(Institute of Scientific and Industrial Research),Osaka University,Osaka,Japan [4]Sichuan Research Institute,Shanghai Jiao Tong University,Chengdu,China [5]Peter Grünberg Institut(PGI-6),Forschungszentrum Jülich,Jülich,Germany [6]Institut für Laser-und Plasmaphysik,Heinrich-Heine-Universität Düsseldorf,Düsseldorf,Germany [7]Key Laboratory for Laser Plasmas(MoE),School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai,China [8]Collaborative Innovation Center of IFSA,Shanghai Jiao Tong University,Shanghai,China [9]Tsung-Dao Lee Institute,Shanghai Jiao Tong University,Shanghai,China

出　　处：《High Power Laser Science and Engineering》2024年第3期62-68,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.11804348,11775056,11975154 and 11991074);the Science Challenge Project(No.TZ2018005).X.F.Li was also supported by the Shanghai Pujiang Program(No.23PJ1414600)。

摘　　要：Polarized electron beam production via laser wakefield acceleration in pre-polarized plasma is investigated by particlein-cell simulations.The evolution of the electron beam polarization is studied based on the Thomas±Bargmann±Michel±Telegdi equation for the transverse and longitudinal self-injection,and the depolarization process is found to be influenced by the injection schemes.In the case of transverse self-injection,as found typically in the bubble regime,the spin precession of the accelerated electrons is mainly influenced by the wakefield.However,in the case of longitudinal injection in the quasi-1D regime(for example,F.Y.Li et al.,Phys.Rev.Lett.110,135002(2013)),the direction of electron spin oscillates in the laser field.Since the electrons move around the laser axis,the net influence of the laser field is nearly zero and the contribution of the wakefield can be ignored.Finally,an ultra-short electron beam with polarization of 99%can be obtained using longitudinal self-injection.

关 键 词：laser wakefield acceleration longitudinal self-injection particle-in-cell simulation polarized electron beam 

分 类 号：TN24[电子电信—物理电子学] TL50[核科学技术—核技术及应用]