The results of numerical simulation of a gyrotron nonadiabatic electron optical system (EOS) in space charge limited current regime (r-regime) are presented. Formation of helical electron beams is carried out at rectilinearly moving particles through area of strong nonuniform magnetic field of solenoids supplied with ferromagnetic screens. The results of calculations have allowed to find optimum parameters EOS in r-regime and to explore velocity distribution in electron beams.

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