1. Faculty of Nuclear Sciences and Physical Engineering Czech Technical University in Prague, Brehova 7, 115 19 Prague 1, Czech Republic
2. PALS Joint Research Laboratory of the Institute of Physics and the Institute of Plasma Physics, ASCR Za Slovankou 3, 182 21 Prague 8, Czech Republic
3. Institute of Plasma Physics and Laser Microfusion 23 Hery St, P.O. Box 49, 00-908 Warsaw, Poland
4. P. N. Lebedev Physical Institute of RAS 53 Leninski Ave., 119991 Moscow, Russia
5. Troitsk Institute for Innovation and Fusion Research, 142190 Troitsk Moscow Region, Russia