Bunching enhancement for coherent harmonic generation by using phase merging effects  

作　　者：Ke Feng Kangnan Jiang Runshu Hu Shixia Luan 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,People’s Republic of China [2]School of Physical Science and Technology,ShanghaiTech University,Shanghai,People’s Republic of China [3]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing,People’s Republic of China

出　　处：《Matter and Radiation at Extremes》2024年第5期10-21,共12页极端条件下的物质与辐射（英文）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.12388102,12225411,12105353,11991072,and 12174410);the CAS Project for Young Scientists in Basic Research(Grant No.YSBR060);the Program of Shanghai Academic Research Leader(Grant No.22XD1424200);the State Key Laboratory Program of the Chinese Ministry of Science and Technology and CAS Youth Innovation Promotion Association(Y201952 and 2022242).

摘　　要：In this paper,promising but simple schemes are investigated to enhance the micro-bunching of relativistic electron beams for coherent harmonic generation(CHG)by using phase merging effects.In contrast to the standard CHG scheme,two specially designed dispersion sections(DSs)are adopted with the DS-modulator–DS configuration.The phase space of the e beam is appropriately coupled in the first DS,and the electrons within one seed wavelength can merge to the same phase with a matched second DS.Micro-bunching of the e beam can thus be enhanced by a large margin with much higher-harmonic components.Taking e beams from laser wakefield accelerators(LWFAs)as an example,start-to-end simulations are performed to show the effectiveness and robustness of the proposed schemes with several configurations.The beam current can be optimized to several tens to hundreds of kiloamperes,and the radiation power reaches hundreds of megawatts in the extreme ultraviolet regime within a 3.5 m-long beamline.The proposed schemes offer new opportunities for future compact free-electron lasers driven by LWFAs and provides prospects for truly compact and widely applicable systems.

关 键 词：MODULATOR HARMONIC PHASE 

分 类 号：O53[理学—等离子体物理]