1. Laboratory of Vacuum Electronics, Institute of High Current Electronics, 2/3, Academichesky Avenue, Tomsk 634055, Russia
2. Department of Applied Mechanics, Tomsk State Pedagogical University, 60, Kievskaya Street, Tomsk 634061, Russia
3. Department “Technologies of Production of Engines for Flying Vehicles”, Moscow Aviation Institute, 4, Volokolamskoe Shosse, Moscow 125993, Russia