作者单位:Institute of Physics, Czech Academy of Sciences, Na Slovance 2, 18221 Prague 8, Czech Republic[1]Research Institute of Pulsed Systems, Moscow, 115304 Russia[2]Russian Research Centre Kurchatov Institute, pl. Kurchatova 1, Moscow, 123182 Russia[3]Czech Technical University, Technicka 2, 16627 Prague 6, Czech Republic[4]