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In a tokamak device, which is the most promising for developing fusion power on Earth, the ionised plasma of the fuel material must be contained in a ring doughnut shaped compartment at very high temperature, a magnetic field is used to control the plasma to keep in the ring shape wihout ever touching the sides. The magnetic field does not actually control the nuclear reaction which is brought about by the high temperature, but it keeps the reaction steady once it starts (in theory, only very short pulses have been achieved so far).

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