Affiliation: | 1.St. Petersburg State University (Staryi Petergof branch), Universitetskii pr. 28, St. Petersburg, 198504, Russia ;2.Kharkov Institute of Physics and Technology, National Scientific Center, Akademicheskaya ul. 1, Kharkov, 61108, Ukraine ;3.R & D Corporation Electronic and Beam Technologies, Bronevaya ul. 6, St. Petersburg, 198188, Russia ;4.St. Petersburg State Polytechnic University, ul. Politekhnicheskaya 29, St. Petersburg, 195251, Russia ;5.Tol’yatti State University, Belorusskaya ul. 14, Tol’yatti, 445667, Russia ; |