Cooldown Symulations for TESLA Test Facility (TTF) Cryostats

  • D. Barni
  • C. Pagani
  • P. Pierini
  • M. Todero
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 43)

Abstract

The first TTF cryostat has been tested in June 1997 and monitored to study the deformations produced during the cool-down procedure. A numerical study of the thermal shields of the cryostat has been carried out with finite element analysis simulations. The results allowed to understand the effect of the cooldown on the TTF cryostat.

The new cryostat design, with the helium pipe directly welded to the thermal shields, needs a careful analysis of the cooldown procedure. To avoid damages to the cryostats during the cooldown a proper procedure has been devised and tested. According to the DESY cryogenic system capabilities, we have studied the possibility to use a mixture of cold and hot helium. By varying the relative percentage of the components, the shields will feel a smooth and progressive cooldown. Analysis results show that a single cryomodule can be cooled in about two days without damaging the cryostat.

This paper reports thermodynamic considerations and the results of the analysis performed for the first and second generation TTF cryostats.

Keywords

Maximum Gradient Convective Heat Exchange Thermal Shield Cooling Pipe Finite Element Analysis Simulation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    TESLA Test Facility linac — Design Report, DESY Print, March 1995, TESLA 95–01; C. Pagani et al., Construction, commissioning and cryogenic performances of the first TESLA Test Facility (TTF) cryomodule, Paper #DF 2, 1997 CEC/ICMC, Portland.Google Scholar
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    ANSYS is a registered trademark of SAS IP.Google Scholar
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    J.E. Jensen, R.B Stewart, W.A. Tuttle, Selected Cryogenic Data Notebook, BNL, 1967.Google Scholar
  4. 4.
    C. Pagani, D. Barni, M. Bonezzi, P. Pierini, J.G. Weisend II, Design of the thermal shields for the new improved version of the TTF cryostat, Paper #FF 3, 1997 CEC/ICMC, Portland.Google Scholar

Copyright information

© Springer Science+Business Media New York 1998

Authors and Affiliations

  • D. Barni
    • 1
  • C. Pagani
    • 1
  • P. Pierini
    • 1
  • M. Todero
    • 1
  1. 1.INFN Milano - LASASegrate (MI)Italy

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