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To start, some gas of hydrogen is injected in the vacuum chamber.
As a result of an electric current, the gas will transform into plasma, which will cause the ionization of the hydrogen. So we have now electrons and protons.
Plasma is a state of matter which we usually found on extreme high temperatures. For example, fire and lightning are plasma.
Then, the electrons and ions are excited by the electric current. So they will collide each other, which will increase the plasma's temperature until a temperature appropriate for the fusion (between 150 and 300 millions degrees). With that, some helium will be create.
Finally, the energy generate will be absorb by the tokamak's wall.
In fact, it's a little sun which is create in a tokamak.