Mechanical performance of a twin-aperture 56 mm bore 1 m long dipole model made with SSC type cables

A twin-aperture dipole model made with standard SSC type cables was launched to initiate studies of lower field magnets for a 7 TeV collider machine. This model, which was entirely constructed at CERN, reached at 1.8 K a peak field of 9.7 T. Short mechanical models, made to check the assembly parameters, as well as the final model magnet were instrumented with mechanical force transducers based on strain gauges to monitor azimuthal stresses and axial forces in the coils during assembly, cooldown and excitation. Dynamic measurements of forces and temperatures during magnet quenching were also performed with a high sampling rate acquisition system. This paper reviews the magnet mechanical design principles, describes the design, fabrication and the calibration of the force transducers and presents the main results of the measurements