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. 10. Single-shot electron beam spectra from the two-stage LWFA with 3-mm-thick second stage. The laser power on the target is a 50 TW, b 48 TW, and c 45 TW. [ 17 ]