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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.

enter image description here

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  • $\begingroup$ Not sure we want to design guns on here. $\endgroup$ – user207455 May 25 at 19:20
  • $\begingroup$ 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. $\endgroup$ – PhysicsDave May 26 at 0:57
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Might be wrong, but I thought voltage (or potential difference) refers to the ratio between the voltages at two points; giving me the impression that these two diagrams are exactly the same?

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  • $\begingroup$ It does not make sense to say that voltage is the ratio between voltages. $\endgroup$ – G. Smith May 26 at 3:38
  • $\begingroup$ I explained it badly but the gist is that it is to do with the difference between two points $\endgroup$ – Randomer May 26 at 11:00

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