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Abstract

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.

Additional information

Authors: OBERT W, JET JOINT UNDERTAKING, ABINGDON, OXON. (GB);SULZER AG, WINTERTHUR (CH);MAYAUX C, JET JOINT UNDERTAKING, ABINGDON, OXON. (GB);SULZER AG, WINTERTHUR (CH);HEMSWORTH R, JET JOINT UNDERTAKING, ABINGDON, OXON. (GB);SULZER AG, WINTERTHUR (CH);JONES A, JET JOINT UNDERTAKING, ABINGDON, OXON. (GB);SULZER AG, WINTERTHUR (CH);PARFITT A, JET JOINT UNDERTAKING, ABINGDON, OXON. (GB);SULZER AG, WINTERTHUR (CH);PEEL, JET JOINT UNDERTAKING, ABINGDON, OXON. (GB);SULZER AG, WINTERTHUR (CH);T, JET JOINT UNDERTAKING, ABINGDON, OXON. (GB);SULZER AG, WINTERTHUR (CH);ZIEGLER B JET JOINT UNDERTAKING, ABINGDON, OXON. (GB), JET JOINT UNDERTAKING, ABINGDON, OXON. (GB);SULZER AG, WINTERTHUR (CH);SULZER AG, WINTERTHUR (CH), JET JOINT UNDERTAKING, ABINGDON, OXON. (GB);SULZER AG, WINTERTHUR (CH)
Bibliographic Reference: REPORT: JET-P(89)54 EN AVAILABLE FROM THE PUBLICATIONS OFFICER, JET JOINT UNDERTAKING, ABINGDON, OXON. OX14 3EA (GB)
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