I am trying to build a power supply in the following wehnelt/electron source configuration:
- The high voltage power supply is a DC supply with maximum of 30 kV, milliampere current range.
- The filament current supply is an AC supply of only a few, certainly less than 20 V.
- To power the supplies, the electric grid is used.
Is it possible to build a supply using individual DC and AC power supplies in series? I would assume in general no as the grounds are connected. Are there however at least some tweaks which would allow building a supply? How is the issue resolved in professional electron beam supplies?