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The use of beryllium requires a large additional commitment both in the form of additional facilities as well as manpower and the impact on the design, operation and maintenance of a large scale machine such as JET or ITER is discussed.

Thermal fatigue life of S65c castellated beryllium tiles has been tested under steady or pulsed heat fluxes. These tests were carried out in the JET neutral beam test facility. A test sequence with peak surface temperatures up to 600 C produced no visible fatigue cracks. In the second series of tests, with temperature up to 750 C evidence for fatigue appeared after a minimum of 1350 stress cycles. These fatigue data are discussed in view of the observed lack of thermal fatigue in JET plasma operations with beryllium PFC. JET experience with S65b and S65c is reviewed and the need for a failure criterion for finite element analyses of Be PFC lifetimes is discussed. .

Additional information

Authors: PICK M A ET AL, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-P(95)59 EN (1995) 14pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon, OX14 3EA (GB)
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