A.A. Shvachko - Post-graduate Student, Yuri Gagarin State Technical University of Saratov. E-mail: alexandr1899@gmail.com A.A. Zakharov - Dr. Sc. (Eng.), Professor, Head of Department «Electronic devises and equipment», Yuri Gagarin State Technical University of Saratov. E-mail: zaharov@sstu.ru A.M. Samylkin - Ph. D. (Eng.), Head of Department, JSC «SPE «Almaz» (Saratov)

The article presents the analysis of the impact of technological variations of geometrical parameters of the ring magnet, which is a part of the magnetic focusing system of a traveling wave tube. Process deviations can affect the geometric parameters to varying degrees for magnets with different combinations of geometric parameters. It has been found that there are certain deviations of the ratio of geometrical dimensions, in which the influence of the magnetic field strength is minimal, which is also accompanied by optimum values of the magnetic mass.