I decided to passivate all the vacuum equipment. This entails completely disassembling the fusor:
Look at the extreme deposition on the ceramic standoff:
Clearly the deposit is going from negative to ground judging from the super clean inner grid (negative) and the very dirty outter grid (ground):
You can see where the electron beams touched the walls of the chamber:
Prometheus Fusion Perfection 
[…] vacuum chamber and parts are back from their passivation. Look how shiny and […]