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Description
FRESCA2 is a dipole magnet for upgrading the actual CERN cable test station FRESCA to a nominal bore field of 13 T in a 100 mm clear aperture. In order to verify the assembly, loading processes and characterize the mechanical behaviour of the FRESCA2 support structure, based on an Al alloy shrinking cylinder pre-loaded through the use of water-pressurized bladders, was mounted around Al blocks (dummy-coils) replacing the brittle superconducting Nb3Sn coils.
The whole assembled structure was cooled-down from room temperature to 77 K three times with liquid nitrogen in a facility specially set up for these tests at CERN. All stages of the assemblies and cool-down tests were monitored via strain gauges located on different components of the structure. These cryogenic tests were performed by increasing the loading gradually for each test up to values corresponding to the ultimate field of 15T for the last one.
The expected stresses within the structure after assembly, loading and cool-down were determined from a 3D finite element model of the support structure. A comparison of the 3D model stress predictions with the strain gauge data measurements is presented.
One copper prototype coil has been fabricated at CEA Saclay and it is been prepared at CERN along with dedicated tooling for reaction and impregnation. A status of this step will be also presented.
Organised by
Ezio Todesco
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