Design of the Thermal Shields for the New Improved Version of the TESLA Test Facility (TTF) Cryostat

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

Abstract

One of the principal goals of the ongoing TTF project is to produce prototype low cost and reliable cryomodules meeting the stringent requirements for TESLA. The first cryomodule was assembled and tested at DESY. The experience gained during the design and the commissioning suggested new solutions to improving the technical design.

The most important improvement is the design of the new thermal shields at 4.5 K and 70 K. In this design the cooling helium pipes are directly welded to the aluminum shields. This solution simplified the technical design of the entire cryomodule and indicated some issues that needed study to verify the behavior of the new structure during cooldown and operation. The principal aspect studied has been the procedures necessary to avoid stresses and deformations produced during the cooldown which might damage the shields. The solution found also prevents the typical deformation induced by the welding and makes the production pre-alignment easier. Shields will be welded through small aluminum fingers that reduce the resistance section of the joint, while increasing the elasticity, unloading the welded joints and preventing possible damage during the cooldown.

Keywords

Welding Region Thermal Shield Cooling Pipe Differential Expansion Finger Region 
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 Report, March 1995, TESLA 95–01.Google Scholar
  2. Conceptual design of a 500 GeV e+c- linear collider with integrated X ray laser facility, R. Brinkmann et al., editors, DESY Report, 1997–048, 1997.Google Scholar
  3. 2.
    F. Alessandria, G. Cavallari, M. Minestrini, T. H. Nichol, C. Pagani, R. Palmieri, S. Tazzari, G. Varisco, Design manufacture and test of the TESLA-TTF cavity cryostat, Adv.Cryo. Engr. 41A:855 (1996).CrossRefGoogle Scholar
  4. 3.
    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
  5. 4.
    D. Barni, C. Pagani, P. Pierini, M. Todero, Cooldown simulations for the TESLA Test Facility (TTF) cryostat, Paper # FF 4, 1997 CEC/ICMC, Portland.Google Scholar

Copyright information

© Springer Science+Business Media New York 1998

Authors and Affiliations

  • C. Pagani
    • 1
  • D. Barni
    • 1
  • M. Bonezzi
    • 1
  • P. Pierini
    • 1
  • J. G. WeisendII
    • 2
  1. 1.INFN Milano - LASASegrate (MI)Italy
  2. 2.DESYHamburgGermany

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