Advanced Nb$_{3}$Sn conductors tested in a racetrack coil configuration for the 11T dipole project

Within the 11T dipole magnet conductor development for the High Luminosity LHC Upgrade, two types of Nb3Sn cable based on the Powder-in-tube (PIT) and Rod and Restack (RRP) processes are tested in racetrack configuration in the Short Model Coil (SMC) magnets. In 2016 and 2017, the performances of three different coils wound with 40-strand cables, one made of OST RRP 132/169 and two of PIT 120 strands have been measured using SMC structure. This paper reports on the main design parameters of the SMC-11T-3 (RRP), the SMC-11T-4 and SMC-11T-5 (PIT) magnets including details on the instrumentation, applied pre-load, maximum expected performances, Residual Resistivity Ratio, splice resistances and inductances. For SMC-11T-3, eight runs have been performed varying the azimuthal pre-stress from 150 to 200 MPa with the aim to study the impact of transverse pressure on the magnet stability and degradation. Only two runs were done for SMC-11T-4 and 5. For the three magnets, the training behavior at both 4.2 and 1.9 K is analyzed in terms of training rate, quench location, maximum quench current and dependence to the Helium bath temperature, level of transverse pre-stress and current ramp rate. The main tests outcome about the coil performances are here discussed.