TRAVELING WAVE LAMP WITH MAGNETIC PERIODIC FOCUSING SYSTEM Russian patent published in 2009 - IPC H01J25/38 H01J23/18 

FIELD: electrics.

SUBSTANCE: invention concerns electric vacuum ultra high frequency (UHF) instruments, particularly construction of O-type traveling wave lamp with magnetic periodic focusing system (MPFS). Lamp includes MPFS combined with resonance slow-down system and consisting of intermittent axially magnetised ring magnets, polar headpieces with ferromagnetic hubs and non-magnetic diaphragms with capacitance bushings, positioned between them and forming transit channel. At least a part of MPFS behind high frequency power input includes ferromagnetic insert forming slow-down system resonators together with adjoining polar heads. Another resonator part is formed by diaphragm in the form of step rotation body, and annular element fixating the insert in diaphragm. Diaphragms and annular elements are made of non-magnetic material with high heat conductivity. Selection of ferromagnetic insert profile, size and position between polar heads defines magnetic field with given high harmonic components and non-sinusoid distribution.

EFFECT: enhanced current permission of beam in high-performance traveling wave lamp in short-wave part of UHF range due to intense electron stream focusing in transit channel of traveling wave lamp with low pulsation.

3 cl, 8 dwg