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Performance of the Cold Ejector of the Jet Cryoplant

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Advances in Cryogenic Engineering

Part of the book series: Advances in Cryogenic Engineering ((ACRE,volume 35))

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Abstract

At JET a cold ejector is used to pump 3 large cryopump systems to a pressure below the suction pressure of the cryoplant compressor (160 gs−1/1.3 b absolute) down to 250 mb below atmospheric pressure. The cold ejector has been successfully operated for over 2 years and had to cope with stringent dynamic conditions such as for cooldown and cryopump regeneration. The performance characteristic of the cold ejector has been analysed by calorimetric measurements with a power of up to 300 W and for flow rates of up to 60 gs−1. The pumping of gas, vapor and liquid have been compared. The results will be presented and operational aspects discussed.

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References

  1. W Obert “The cryogenics of JET and NET’ in Proc. 12th Int. Cryog. Conference ICEC12, Southampton, 1988.

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  2. W Obert et al., “Large Scale Cryopumps for JET” in Proc. 10th Int. Cryog. Eng. Conference” ICEC 10, Helsinki) 1984.

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  3. W Obert et al., “Low Loss Flexible Cryogenic Transfer Line for JET” in Proc. 9th Int. Cryog. Eng. Conference ICEC 9, Kobe/Japan, 1982.

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  4. R H Perry, C H Chilton, Chemical Engineers Handbook, Mc Craw-Hill Book Company.

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  5. G Huegel, “Berechnung von Strahlapparaten, VDI Zeitschrift, Bd 83, Nr 38, Sept 1939.

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Author information

Authors and Affiliations

  1. JET Joint Undertaking, Abingdon Oxon, 0X14 3EA, UK

    W. Obert, C. Mayaux, R. Hemsworth, A. Jones, A. Parfitt & T. Peel

  2. Sulzer AG, CH-8401, Winterthur, Switzerland

    B. Ziegler

Authors
  1. W. Obert
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  2. C. Mayaux
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  3. R. Hemsworth
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  4. A. Jones
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  5. A. Parfitt
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  6. T. Peel
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  7. B. Ziegler
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Editor information

Editors and Affiliations

  1. Fermi National Accelerator Laboratory, Batavia, Illinois, USA

    R. W. Fast

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© 1990 Springer Science+Business Media New York

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Obert, W. et al. (1990). Performance of the Cold Ejector of the Jet Cryoplant. In: Fast, R.W. (eds) Advances in Cryogenic Engineering. Advances in Cryogenic Engineering, vol 35. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-0639-9_122

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  • DOI: https://doi.org/10.1007/978-1-4613-0639-9_122

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-1-4612-7904-4

  • Online ISBN: 978-1-4613-0639-9

  • eBook Packages: Springer Book Archive

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