| J. E. Muñoz Garcia, C. Giloux, D. T. Ziemianski, F. Rondeaux, G. de Rijk, H. Bajas, J. M. Rifflet, J. C. Perez,
M. Durante, M. Charrondiere, M. Bajko, M. Devaux, M. Guinchard, P. Ferracin, P. Fessia, and P. Manil |
| This paper reports on the assembly process and
cool-down to cryogenic temperature of the support structure of
FRESCA2, which is a dipole magnet for upgrading the actual
CERN cable test facility FRESCA. The structure of the FRESCA2
magnet is designed to provide the adequate pre-stress, through
the use of keys, bladders, and an Al alloy shrinking cylinder. To
qualify the assembly and loading procedures, the structure was
assembled with Al blocks (dummy coils) that replaced the brittle
Nb3Sn coils, and then cooled-down to 77 K with liquid nitrogen.
The evolution of themechanical behavior wasmonitored via strain
gauges located on different components of the structure (shell,
rods, yokes and dummy coils). We focus on the expected stresses
within the structure after assembly, loading and cool-down. The
expected stresses were determined from the 3-D finite element
model of the structure. A comparison of the 3-D model stress
predictions with the strain gauge data measurements is made. The
coherence between the predicted stresses with the experimental
gauge measurements will validate the FEM model of the structure. |
