High-power laser-driven source of ultra-short X-ray and gamma-ray pulses T. Zh. Esirkepov, S. V. Bulanov, A. G. Zhidkov, A. S. Pirozhkov and M. Kando Eur. Phys. J. D, 55 2 (2009) 457-463 Published online: 16 June 2009 DOI: 10.1140/epjd/e2009-00172-y