K.A. Barantsev - Post-graduate Student, Assistant, Peter The Great St.Petersburg Polytechnic University E-mail: kostmann@yandex.ru E.N. Popov - Ph. D. (Phys.-Math.), Research Scientist, Senior Lecturer, Peter The Great St.Petersburg Polytechnic University E-mail: enp-tion@ya.ru A.N. Litvinov - Ph. D. (Phys.-Math.), Senior Research Scientist, Associate Professor, Peter The Great St.Petersburg Polytechnic University E-mail: andrey.litvinov@mail.ru V.M. Petrov - Dr. Sc. (Phys.-Math.), Head of Department, Peter The Great St.Petersburg Polytechnic University E-mail: vikpetroff@mail.ru