Document Type and Number:
Japanese Patent JPS5720656
Kind Code:
B2
Abstract:
An efficient high power beam tube includes a gridded convergent flow electron gun for forming and projecting a beam of electrons through a centrally apertured accelerating anode to a fly-trap type depressed beam collector structure. A tapered conductive probe is axially disposed within the beam collector for cooperation with a collector focus electrode structure to shape the equipotentials at the mouth of the fly-trap beam collector, in the presence of space charge depression within the collector, such as to retain laminar electron flow and uniform current density transversely across the beam as the beam decelerates and expands into the beam collector structure, whereby increased depressed collector efficiency is obtained.
Application Number:
JP9480073A
Publication Date:
April 30, 1982
Filing Date:
August 23, 1973
Export Citation:
International Classes:
H01J23/027; H01J25/02