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JET has accumulated practical experience of plasma operation in both limiter and divertor configurations using massive beryllium plasma facing components. The latter have shown evidence, even after a very short operational phase, for localised melting of the beryllium surface. Sustained melting results in substantial transport of the liquid beryllium metal; there is, however, no evidence for low cycle thermal fatigue under this extreme environment. Design has proceeded by analysis largely in support of test bed thermal testing of prototypes. For flux densities less than or equal to 5 MW/m{2} and T surface less than or equal to 1000 C, typically 200 pulses can be sustained with plastic deformation and no surface fatigue cracking. The latter is seen for more extreme conditions, ie flux densities in excess of 14 MW/m{2} and surface temperature greater than 700 C. Failure of thin claddings of beryllium to heat sinks tend to occur along the beryllium to substrate interface not due to thermal fatigue of the bulk beryllium material.

Additional information

Authors: DEKSNIS E B, JET Joint Undertaking, Abingdon, Oxon (GB);PEACOCK A T, JET Joint Undertaking, Abingdon, Oxon (GB);ALTMANN H, JET Joint Undertaking, Abingdon, Oxon (GB);IBBOT C, JET Joint Undertaking, Abingdon, Oxon (GB);FALTER H D, JET Joint Undertaking, Abingdon, Oxon (GB)
Bibliographic Reference: Report: JET-P(97)01 EN (1997) 15 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon, OX14 3EA (GB)
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