(Joint
European Torus) at Culham, UK is one of the major tokamaks
in the world and has produced 16 MW of fusion power in D-T
experiments.
In a tokamak, the plasma has a shape like an inflated tube
of a car wheel, enclosed in a magnetic cage. The magnetic
fields produced by the coils surrounding the plasma as well
as by a current driven in the plasma itself, help in confining
the hot plasma away from surrounding material walls. The plasma
is heated to fusion relevant temperatures (a few hundred million
degrees Kelvin!) by injecting high energy neutral particle
beam or radio frequency waves from outside which get absorbed
in the plasma.
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