Probing plasma wakefields using electron bunches generated from a laser wakefield accelerator

C. J. Zhang, Y. Wan, B. Guo, J. F. Hua, C. H. Pai, F. Li, J. Zhang, Y. Ma, Y. P. Wu, X. L. Xu, W. B. Mori, H. H. Chu, J. Wang, W. Lu, C. Joshi