E.O. Pershin, D.B. Solovyov, A.S. Shalumov
S.A. Kuznetsov - Post-graduate Student, MATI - Russian State Technological University (Moscow). E-mail: kuznetsov_s_a@mail.ru
N.N. Beklemishev - Dr. Sc. (Phys.-Math.), Professor, Head of Department of physics, MATI - Russian State Tech-nological University (Moscow). E-mail: nnbeklem@mati.ru
N.V. Kalenova - Ph. D. (Phys.-Math.), Deputy Head of Department of physics, MATI - Russian State Technological University (Moscow). E-mail: perepljuika@bk.ru