Do get in touch if you want to back us up MetalicaRap

hi
Just welcoming you all to a ; Green Tech ,Viral distributed, Open source, Metal powder 3D printer development Team.

Come and join us,

and back us up.

kind regards
Rapatan

Hi,
Looking at your information, you seem to be designing an electron gun from scratch.
Why not use a large CRT electron gun and deflection electronics or,
use a power vacuum valve electrode assembly for higher beam current?
Regards

Great !

Power vacuum valve electrode do not traditionally have replaceable filaments, ( ebm filament e.g Tungsten ribbon 2mm wide 0.25mm thick.)
normally an EBM tungsten filament lasts 7 to 100 hrs, but if you could see a way to allow replacement or find a cheap power vacuum valve electrode in tungsten with an exposed filament area of about 3mm², at 2500 C that would be great!!

kind regards
Tansen



p.s. Electrostatic deflection voltage must be similar to acceleration voltage so then electron deflectors require 100KV circuits and 100KV electrical feedthroughs for each deflection plate ( this is impracticable/ costly ). CRT gun is too low power by a factor of about 1000.