Cathodic ray Emmisions. i need a plain expanation to a plain question.

[Turbo]

It's also called the Farnsworth Fusor, invented by the man that also invented television.
So many of these things go hand in hand.
I did do a deep study on it long time ago and if it's amazing, or important enough i guess you never forget it.

[baroutologos]

Back to the initial case...


Vaccum electron accelaration by grid... and then applying magnetic field to restrict electrons returning back to anodic grid..
https://en.wikipedia.org/wiki/Gridded_ion_thruster


just saying

[Turbo]

Well the vacuum is there to lower the amount of collisions along the way.
This lowers the energy needed to reach a certain distance, and improves transconductance.
You could perfectly do it in open atmosphere but you will need so much more driving power that the setup will get red hot and probably melt under your eyes.
I am however unsure what is your primary direction...
What are you trying to do ?