Electron gun design

I have a question about electron guns. I have read a lot, and all designs use high NEGATIVE voltage ($$-1000$$ V for example). Is possible to use high POSITIVE voltage like this drawing? Or do you think it will not work this way?

Considering that all the chamber walls are at ground voltage ($$0$$ V) in both cases.

• Not sure we want to design guns on here. – user207455 May 25 at 19:20
• Looks fine to me. Electrons will travel to a more positive electrode. The transformer isolates the cathode so it can be raised or lowered to any voltage. – PhysicsDave May 26 at 0:57