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 la unched to initiate studies of lower field magnets for a 7 TeV collider machine, This model, which was entirely constructed at CERN, reached at 1.8K a peak field of 9.7 T. Short mechanical models, made to check the assembly parameters, as well as the final model magnet were instru mented with mechanical force transducers based on strain gauges to mon itor azimuthal stresses and axial forces in the coils during assembly, cooldown and excitation. Dynamic measurements of forces and temperatu res during magnet quenching were also performed with a high sampling r ate acquisition system. This paper reviews the magnet mechanical desig n principles, describes the design, fabrication and the calibration of the force transducers and presents the main results of the measuremen ts.