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Thermo-Mechanical Measurements on Impregnated Cu-NbTi Cable Stacks and on a Coil Mock-Up of the R3B-GLAD Magnet

The Cu-NbTi conductor for the R3B-GLAD spectrometer magnet was manufactured. In order to correctly know the thermo-mechanical behavior of this Rutherford cable after insulation and then impregnation, some impregnated cable stacks have been submitted to mechanical tests at room and cryogenic temperatures. The analysis of these measurements will be presented and compared to a theoretical approach. A half-scale mock-up of a real coil was built with the final conductor. After its cooling down to 80 K, the measurements have given the thermal shrinkage coefficients of this coil in the three directions. They confirmed the really orthotropic behavior of these composite coils. The method and the analysis of these measurements are presented.