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When tritium is used as a fusion fuel in the JET tokamak it is necessary to use double, interpumped windows on the vacuum vessel. These vacuum windows must provide reliable high vacuum seals and satisfy stringent safety criteria. They must withstand atmospheric pressure and mechanical shocks with a substantial safety margin, and be capable of repeated cycling from room temperature to about 250 C. Methods are discussed for reducing the frequency dependence of the transmission of double windows to be used for various millimetre wave diagnostics, over the appropriate frequency ranges.

Additional information

Authors: HUGHES T P, JET Joint Undertaking, Abingdon, Oxon. (GB);BARTLETT D V, JET Joint Undertaking, Abingdon, Oxon. (GB);RICHARDS S D, Imperial College, London (GB)
Bibliographic Reference: Report: JET-P(93)83 EN (1993)
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199311637 / Last updated on: 1994-11-28
Original language: en
Available languages: en