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JET has always been operated with low-Z graphite limiters to reduce radiation losses. Latest results at high power (up to 30MW) indicate that in most cases the impurity content in the plasma is too high to reach near reactor conditions. To reduce the impurity content to an acceptable level it is proposed to use beryllium for limiters and wall surfaces. This paper discusses the effects of impurities on plasma performance, compares the physical and chemical properties of graphite with those of beryllium and presents a simple model for impurity production at the plasma edge.

Additional information

Authors: HUGON M, JET Joint Undertaking, Abingdon, Oxon. (GB);LALLIA P P, JET Joint Undertaking, Abingdon, Oxon. (GB);REBUT P H, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-R(89)14 EN (1989)
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199010648 / Last updated on: 1994-12-01
Original language: en
Available languages: en
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