Head of project

Dr. Thomas Eich
Phone:+49 89 3299-1927Fax:+49 89 3299-2580

Garching site

More information

Participation in the Joint European Torus JET

JET, the Joint European Torus – the largest fusion experiment in the world – is to come as close as possible to ignition of the plasma. IPP is one of the participants in the scientific programme of JET.

JET, the Joint European Torus, went into operation in 1983. For the first time in the history of fusion research it was possible with JET in 1991 to release a substantial amount of energy through controlled nuclear fusion. For the duration of 2 seconds the device generated a fusion power of 1.8 megawatt.

This was achieved a second time in 1993 by the American TFTR (Tokamak Fusion Test Reactor) fusion experiment at Princeton, shut down in 1997. With a heating power of 30 megawatts TFTR released about 6 megawatts of fusion power. Five months later TFTR was able to increase this to 9 megawatts. While TFTR worked for the first time with a plasma composed of the proper reactor mix of deuterium and tritium, in 1991 JET used a "rarefied" plasma with a tritium content of only 14 per cent.

Experiments with the proper reactor mix took place in JET in 1997. This yielded a world record fusion power of 13 megawatts and a fusion energy of 14 megajoules. Sixty-five per cent of the heating power input was recovered by fusion. The plasma of JET is now only a factor of six away from ignition.

Today, JET is the only machine capable of operating with the deuterium-tritium fuel mixture that will be used in ITER and commercial fusion power stations.

Technical data:
Major plasma radius 2,96 metres
Minor radii 1,25/2,10 metres
Magnetic field 3,4 tesla
Plasma current 5 megaamperes
Plasma heating 50 megawatts
Plasma volume 80 cubik metres
Plasma mixture hydrogen, deuterium, (tritium)
Plasma temperature 100 - 200 million degrees


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