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A large cryopump has been operational since 1994 inside the plasma chamber of the Joint European Torus (JET). An analytical model, which analyses the uncontrolled warm-up behaviour of the cryopump and associated water cooled components, under all possible operating conditions, is presented. The system behaviour is simulated for a wide range of fault conditions. The model is validated by a series of experiments conducted both in a specially designed test rig and inside the JET vacuum vessel, using real scale components. Based on this analysis, an automatic safety system has been constructed and implemented into the JET operation routines. The system incorporates protective actions which prevent the development of excessive stresses in the cryopump components, thus ensuring their mechanical integrity and reliability.

Additional information

Authors: AGELADARAKIS P A, JET Joint Undertaking, Abingdon, Oxon (GB);PAPASTERGIOU S, JET Joint Undertaking, Abingdon, Oxon (GB);O DOWD N P, Imperial College, London (GB);WEBSTER G A, Imperial College, London (GB)
Bibliographic Reference: Report: JET-R(97)09 EN (1997) 27pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon, OX14 3EA (GB)
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