HIGH POWER BEAM TUBE HAVING DEPRESSED POTENTIAL COLLECTOR CONTAINING FIELD-SHAPING PROBE

摘要

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.