The invention discloses a radial fan-shaped magnetic focusing
system for a radial beam traveling-
wave tube, and belongs to magnetic focusing systems in the technical field of vacuum
electron devices. A
magnetic field distributed in the radial direction is generated by the focusing
system, and the direction of the
magnetic field is divergent in the radial direction, so that a radial component of the
magnetic field and a moving trajectory of a radial
electron beam are consistent, and the focusing effect of the focusing
system on the radial fan-shaped
electron beam is improved. According to the technical scheme, the radial fan-shaped magnetic focusing system for the radial beam traveling-
wave tube comprises a permanent
magnet with the cross section shaped like a rectangle and a pole shoe with the cross section shaped like a T, the permanent
magnet is shaped like a fan, and the pole shoe is shaped like a fan. Due to the fact that the permanent
magnet and the pole shoe are both designed to be of a fan-shaped structure, the direction of the radial magnet field generated by the radial fan-shaped magnetic focusing system is in a radial mode, the direction of the radial magnetic field is matched with the moving trajectory of the electron beam which runs in a radial mode, and the focusing effect of the focusing system on the electron beam is significantly improved.