Simultaneous generation of drive and witness beam for collinear wakefield acceleration

8th International Particle Accelerator Conference

Ha, G.^1 ; Power, J.G.^2 ; Conde, M.^2 ; Doran, D.S.^2 ; Gai, W.^2

Pohang Accelerator Laboratory, Pohang, Gyeongbuk

790-784, Korea, Republic of^1

Argonne National Laboratory, Argonne

IL

60439, United States^2

关键词: Beam lines;    Dielectric structure;    Emittance exchange;    Energy spreads;    Precise control;    Relative errors;    Wakefield acceleration;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/874/1/012027/pdf
DOI  :  10.1088/1742-6596/874/1/012027

来源: IOP

【 摘 要 】

Generating the drive and witness bunch for collinear wakefield acceleration (CWFA) requires precise control of the longitudinal bunch shape for each bunch as well as the controlling their separation. The emittance exchange (EEX) beamline and a transverse mask can be used to achieve all of these requirements. First, this EEX-based method can independently control the longitudinal bunch shape of each bunches so that the drive bunch is shaped to generate a high transformer ratio while witness bunch is shaped to suppress its energy spread. Second, the timing jitter between the drive and witness bunch poses a serious limitation to the CWFA scheme but the EEX-based method eliminates this since both bunches are generated at the same time and share the exactly same beamline so there are no relative errors. In this paper, we confirm the feasibility of this EEX-based method for simultaneous generation with simulation for CWFA in a dielectric structure.