1. Joint Institute for High Temperatures of the Russian Academy of Sciences, Izhorskaya St. 13, Bldg. 2, Moscow 125412, Russia
2. National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Kashirskoe Shosse 31, Moscow 115409, Russia
3. National Research University Moscow Power Engineering Institute, Krasnokazarmennaya St. 14, Moscow 111250, Russia