1. Institute of Plasma Physics and Laser Microfusion, 01-497 Warsaw, Poland
2. Institute of Plasma Physics, Czech Academy of Sciences, 182 00 Prague, Czech Republic
3. Department of Radiation and Chemical Physics, Institute of Physics, Czech Academy of Sciences, 182 21 Praha, Czech Republic
4. Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, 115 19 Prague, Czech Republic
5. National Research Nuclear University MEPhI, 115409 Moscow, Russian Federation
6. Warsaw University of Technology, ICS, 00-661 Warsaw, Poland