Philip G. Rutberg
Institute of Problems of Electrophysics of Russian Academy of Sciences 191186, Russia, St. Petersburg, Dvortsovaya nab. 18
A. A. Safronov
Institute for Electrophysics and Electric Power RAS (IEE RAS), Saint-Petersburg, Russia
V. E. Kuznetsov
Institute for Electrophysics and Electric Power RAS (IEE RAS), Russia
A. V. Surov
Institute for Electrophysics and Electric Power, Russian Academy of Sciences, 18 Dvortsovaya nab., 191186, St.-Petersburg, Russia
S. D. Popov
Institute for Electrophysics and Electric Power, Russian Academy of Sciences, 18 Dvortsovaya nab., 191186, St.-Petersburg, Russia