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JET is investigating beryllium as a material for walls and limiters. Studies were carried out initially with a thin layer of beryllium evaporated onto the walls of the machine. Later on, the graphite material of the belt limiter was exchanged for beryllium. The use of this material generally improved plasma behaviour. A comparison of the plasma performance with graphite and beryllium is presented. The impurity behaviour with respect to fluxes, concentrations and effective charge and dilution is discussed. Details are given of density limits, disruption behaviour, wall pumping, hydrogen isotope retention and the power handling capability of the beryllium limiter in the present design. Examples of improved plasma performance are provided.

Additional information

Authors: DIETZ K J, JET Joint Undertaking, Abingdon, Oxon. (GB);JET TEAM, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-P(90)53 EN (1990) 16 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199110263 / Last updated on: 1994-12-02
Original language: en
Available languages: en
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