Performance of the cold ejector of the JET cryoplant
A cold ejector is used to pump the helium inside 3 large operational cryopump systems at JET to a pressure below the suction pressure of the cryoplant compressor (160 g/s/1.3b absolute) down to 250 mb below atmospheric pressure. The cold ejector has been operated successfully for over 2 years and copes with the stringent dynamic conditions encountered during cooldown and cryopump regeneration. The performance characteristic of the cold ejector is analysed by calorimetric measurements with power of up to 300 W and for flow rates of up to 60 g/s. The pumping of gas, vapour and liquid have been compared; the results are presented and operational aspects discussed.
Bibliographic Reference: Report: JET-P(89)54 EN (1989)
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199010656 / Last updated on: 1994-12-01
Original language: en
Available languages: en