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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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Short answer - almost all of it. Your body is a mixture of chemical elements. By number, most of the nuclei are hydrogen, by mass its mostly oxygen. In cremation, most of this oxygen, along with most of the other combustible things like carbon, hydrogen ends up going up the chimney. Hence the low residual mass. Energy (including rest mass energy) is ...

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69.8 kg That's assuming that your original human weighed 70 kg. If that doesn't sound like much got burnt up, consider that the energy released in this reaction is equivalent to that in 3 millions tonnes of TNT exploding: $14.4 \times 10^{15}J$. The maths In order to work this out, let's see what humans are made of. According to Wikipedia, 61% of a human ...

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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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