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.
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References
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.
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J.E. Jensen, R.B Stewart, W.A. Tuttle, Selected Cryogenic Data Notebook, BNL, 1967.
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.
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© 1998 Springer Science+Business Media New York
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Barni, D., Pagani, C., Pierini, P., Todero, M. (1998). Cooldown Symulations for TESLA Test Facility (TTF) Cryostats. In: Kittel, P. (eds) Advances in Cryogenic Engineering. Advances in Cryogenic Engineering, vol 43. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-9047-4_37
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DOI: https://doi.org/10.1007/978-1-4757-9047-4_37
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