Nguyen Van Phe – Post-graduate Student, Higher School of Applied Physics and Space Technologies, 

Peter The Great St. Petersburg Polytechnic University

E-mail: nvphe1905@gmail.com

A.I. Gorlov – Ph.D.(Eng.), Assistant, Higher School of Applied Physics and Space Technologies, 

Peter The Great St. Petersburg Polytechnic University

E-mail: anton.gorlov@yandex.ru

A.L. Gelgor – Ph.D.(Eng.), Associate Professor, Higher School of Applied Physics and Space Technologies, 

Peter The Great St. Petersburg Polytechnic University

E-mail: a_gelgor@mail.ru