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Abstract

The Joint European Torus (JET) is the largest single project of the coordinated nuclear fusion research programme of the European Atomic Energy Community (Euratom). The members of the JET Joint Undertaking are Euratom, all its associated partners of the fusion programme along with Switzerland and Sweden. JET is the largest tokamak device presently in operation and along with TFTR is designed to operate with deuterium and tritium plasmas in the latter parts of the programme. The machine is shown in Fig 1 and it has overall dimensions of 15 metres in diameter and 12 metres in height. The toroidal vacuum vessel has a major radius of 2.96 metres, with a D-shaped cross-section 2.5 metres by 4.2 metres. The plasma is contained, away from the walls of the vacuum vessel, by means of a magnetic confining field. This is provided mainly by 32 D-shaped coils surrounding the vacuum vessel (toroidal field). This, coupled with that produced by the current flowing through the plasma, form the basic magnetic fields for the tokamak confinement system. Additional coils (poloidal field) around the outside of the vacuum vessel are used to shape and position the plasma. The essential objective of JET is to create and study plasmas in conditions, and with dimensions approaching those needed in a fusion reactor. The main areas of study are: a. The study of plasma processes and scaling laws in regions close to those needed for fusion reactors. b. The study of interaction of the plasma with the walls of the containment vessel. c. The study of plasma heating methods. d. The study of the behaviour of the energetic alpha particles produced. The experiment is currently running on schedule and has produced stable plasma discharges of 2.5 to 3 MA with a flat top time of 6-8 seconds. Discharges with a peak current of 5 MA with a flat top time of one second have also been obtained.

Additional information

Authors: JONES E M JET JOINT UNDERTAKING, ABINGDON (UK), JET JOINT UNDERTAKING, ABINGDON (UK)
Bibliographic Reference: WRITE TO THE PUBLICATIONS OFFICER, JET JOINT UNDERTAKING, ABINGDON, OXON, OX14 3EA (UK), MENTIONING REPORT JET-P(85)21, 1985
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