Formation of helical electron beams
of gyroresonance devices in a strong
nonuniform magnetic field

S. P. Belov, A. N. Kuftin, V. N. Manuilov, Sh. E. Tsimring
Institute of Applied Physics RAS, N. Novgorod, Russia

The analytical theory of formation of helical electron beams in a longitudinal nonuniform magnetic field is advanced. Criteria for a required degree of nonadiabaticy of a magnetic field, sufficient for providing large enough oscillating energy of electrons in the cavity are formulated. The estimations of the basic parameters of a beam (oscillatory velocities, electron beam guiding center radius, velocity spread), using stage and bell-shaped approximations of a magnetic field are given. The factors responsible for velocity spread are considered.

Contents