D.N. Sokolov - Postgraduate student of department of the theoretical physics, Tver State University. E-mail: dnsokolov@mail.ru
N.Yu. Sdobnyakov - Associate professor of department of the theoretical physics, Tver State University. E-mail: nsdobnyakov@mail.ru
A.Yu. Kolosov - Postgraduate student of department of the theoretical physics, Tver State University. E-mail: kolosov-au@yandex.ru
N.V. Novozhilov - Postgraduate student of department of the theoretical physics, Tver State University. E-mail: nnowhereman@gmail.com
A.S. Antonov - Postgraduate student of department of the theoretical physics, Tver State University. E-mail: s014451@mail.ru

S.M. Arakelyan - Dr. Sc. (Phys.-Math.), Professor, Head of Dep., Vladimir State University named after A.&N. Stoletovs. E-mail: arak@vlsu.ru A.F. Galkin - Ph. D. (Phys.-Math.), Professor, Vladimir State University named after A.&N. Stoletovs. E-mail: arkad47@mail.ru S.V. Zhirnova - Senior Lecturer, Vladimir State University named after A.&N. Stoletovs. E-mail: svetlanna_vik@mail.ru A.V. Osipov - Junior Research Scientist, Vladimir State University named after A.&N. Stoletovs. E-mail: patifon@mail.ru@mail.ru

D.S. Makhanko

JSC Research Institute of Gas-Discharge Devices (Ryazan, Russia)