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A cryo-condensation pump has been installed inside the JET vacuum vessel as part of the divertor programme. The stringent requirements of the JET operational cycle and the hostile tokamak environment presented particular challenges to the engineering of the pump. The design has to cope with high eddy current forces from the plasma operation and be compatible with in situ baking to 573 K prior to subsequent operation at 77 K. The pump also has to fulfil stringent requirements relating to overall reliability and operational safety in a variety of possible fault scenarios (loss of torus vacuum, cooling water, cryogens, etc.). The design, manufacture, assembly, quality control, testing and operational safety of the pump are described.

Additional information

Authors: PAPASTERGIOU S, JET Joint Undertaking, Abingdon, Oxon. (GB);OBERT W, JET Joint Undertaking, Abingdon, Oxon. (GB);THOMPSON E, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-P(94)37 EN (1994) 13 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199411464 / Last updated on: 1994-12-06
Original language: en
Available languages: en