Developments in laser wakefield accelerators: From single-stage to two-stage*
Li Wen-Tao, Wang Wen-Tao†, Liu Jian-Sheng‡, Wang Cheng, Zhang Zhi-Jun, Qi Rong, Yu Chang-Hai, Li Ru-Xin, Xu Zhi-Zhan
Fig. 1. a The 2D image of the longitudinal acceleration field of the LWFA inside the first period. b The plot of the accelerating field E z on the longitudinal axis of a.