Mechanical Analysis of the FRESCA2 Dipole During Preload, Cool-Down, and Powering

The FRESCA2 dipole magnet is being developed within a collaboration between CEA Saclay and CERN. The main goal of the magnet is to provide a 13 T nominal bore field into a clear aperture of 100 mm diameter, for the second generation cable test facility FRESCA2 at CERN. Two magnet assemblies have been done with different coils. The assemblies have been preloaded at room temperature, cooled-down in liquid helium, and powered with several current cycles. The magnet is mechanically instrumented with strain gauges on the external shell, tie rods, and central post of the coils. Strain data are compared with a 3-D mechanical model, in order to validate different assumptions such as friction coefficients, material properties, and prestress levels. This paper reports the results of the mechanical measurements collected during preload, cool-down, powering, and warm-up of the magnet.