Technical Aspects of Impurity Control at JET: Status and Future Plans

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Abstract
The salient feature of 1989–1990 operation at JET has been the use of beryllium as a first wall material. Technical and safety aspects of JET operation with beryllium are described. The use of beryllium has substantially improved the plasma purity and as a consequence a record fusion product (nD Ti τe) of 9 × 1020 m−3.keV.s has been achieved. Impurity influxes however prevent the achievement of higher plasma parameters and reaching steady state conditions. A new divertor configuration has been proposed for JET with a view to study impurity control, fuelling and exhaust, in conditions relevant for the next generation of machines. The latest design features a multi-coil configuration which gives substantive operational flexibility. A technical description of the major components of the divertor including the internal coils, the target plates the pumping and fuelling systems is given.

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