The JET machine: Design, construction, and operation of the major systems

The basic parameters of the Joint European Torus (JET) machine are presented together with the reasons that guided their choice. The design principles followed during the conceptual phase are also described. Existing technology and modular design were used as far as possible, with a view to reducing the technological risk and to make the machine easily maintained. For each of the main components of the machine, the design and manufacturing techniques are reviewed. The operating history of the vacuum vessel and associated systems, such as the pumping and bakeout systems, is presented