thermionics laboratory, inc
3kW Rod fed e-gun manual Page 7
filament so you have an even gap of .010 inches between the filament and the
beam former (see figure below). Tighten the filament clamp screws.
7. The gap between the beam former and the anode should be checked to assure a
spacing of .040 inches.
8. When looking down on the filament you should see ~1/3
rd
of the filament exposed.
The filament, beam former and anode should all be parallel to each other. This
spacing is very important to assure proper focusing of the electron beam.
9.
Replace the emitter assembly and reconnect the high voltage leads.
10.
Replace the shield.
