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Suppose you start with a linear solenoid. Due to the Lorentz force charge particles travel in circles (or helices) inside the solenoid so they can't reach the walls of the solenoid. But obviously the trouble is that they will leak out of the ends. Now we curve the solenoid round and join its ends together to make a torus so now the particles can't leak out ...


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Converting my comment to an answer: Well, I'd start up a new plasma system using an inert gas - I'd rather find out any problems with a non-explosive gas mixture. Once I know that everything works (vacuum, valves, no leaks, plasma actually ignites, ...) I would move on to the more exciting mixtures. Remember - for any non-trivial system (and even many ...



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