Instability-free ion acceleration by two laser pulses M.L. Zhou, S. Zhao, H.Y. Wang, C. Lin, H.Y. Lu, Y.R. Lu, T. Tajima, X.T. He, C.E. Chen, Y.Q. Gu and X.Q. Yan Eur. Phys. J. Special Topics, 223 6 (2014) 1031-1035 Published online: 04 June 2014 DOI: 10.1140/epjst/e2014-02153-7