New science division: Particle physics

[Kovirii]

If you are responding specifically about electrostatic accelerators for ion implantation, the button would just need to be a short circuit between the ends of the charging circuit. Unless you are maybe talking about purging the injection chamber? It's possible and even common to run sub-MeV accelerators without shielding gas, so I guess you could just have a feed tube and a purge tube. Sealed systems under insulating gas typically have a high pressure tank somewhere inside since not much is really needed to generate ions. Think fist-size tank.

Any charged beam can be directed with a sufficiently strong magnetic field, though we are talking like 10T to get about a 20 degree bend over a few feet for a half MeV beam.

The pump suggestion wasn't really tied to the purge suggestion.
I was envisioning some generic cyclotron that when purged, would redirect a stream of particles or energy out a pipe. So something like a shooting a death ray/laser/energy beam off into space. This could be accomplished by opening a shutter and having some magnets turn on or off, I guess. If the setup has a beam dump, sabotaging or destroying it could lead to some chaos. Technical details aside, I just thought it would be cool.