JETJET, the Joint European Torus, is a tokamak and one of the largest nuclear fusion reactors yet built.
Situated in Culham, Oxfordshire, in the UK, construction was started in 1978 and the first experiments began in 1983.
JET was later equipped with remote handling facilities to cope with the radioactivity produced by deuterium-tritium fuel, which is the fuel proposed for the first generation of fusion power plants. Pending construction of ITER, JET remains the only large fusion reactor able to use this fuel mix.
See also Timeline of nuclear fusion.