M.V. Kuzeleva,
A.A. Rukhadzeb,a,
P.S. Strelkov,
A.G. Shkvarunets aLomonosov Moscow State University, Faculty of Physics, Leninskie Gory 1 build. 2, Moscow, 119991, Russian Federation bProkhorov General Physics Institute of the Russian Academy of Sciences, ul. Vavilova 38, Moscow, 119991, Russian Federation