I, for a while now, wanted to build a little Farnsworth desk fusor. Nothing too powerful, simply a small "desk lamp" if you will. As the fusor needs 2 grids, I was wondering, if it might be possible to position the outer grid outside of the vacuum chamber, as to make the inner grid a bit bigger. Just an idea, nothing solid yet. Just want to know if it's possible/feasable.

  • $\begingroup$ Well, what do those two grids do, and how is that impacted by having a material between them, either a metal or an insulator? $\endgroup$
    – Jon Custer
    Commented Nov 11, 2020 at 19:29
  • $\begingroup$ Well, a metal inbetween them would act as a faraday cage, but a vacuum itself acts like an insulator, so an insulator should be fine shouldn't it? Given that we don't have a perfect insulator, as soon as the voltage is high enough, a current should flow. I suppose the air around it would be ionized and then bombard the shell, but it should work, I think. $\endgroup$
    – Mat NX
    Commented Nov 12, 2020 at 8:11


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