1. National Centre for Nuclear Research, 7 Andrzeja Soltana Str., 05-400 Otwock, Poland
2. Institute of Tele and Radio Technology, 11 Ratuszowa Str., 03-450 Warsaw, Poland
3. Institute of High Current Electronics, 2/3 Akademichesky Ave., 634055 Tomsk, Russia
4. Helmholtz-Zentrum Dresden-Rossendorf, 400 Bautzner Landstr., 01328 Dresden, Germany