Quench Behavior of Prototype Nb-Ti HL-LHC Dipole Canted Cos-Theta Orbit Corrector Magnets

The HL-LHC project is an upgrade of the LHC that requires double aperture dipole correctors. In 2015, CERN selected Canted Cos-Theta (CCT) magnet, and the development of the MCBRD magnets followed. Since then, a prototype (P1) has been built and measured at CERN, and quench results agree with simulations. In 2017, China joined the programme with in-kind prototypes and twelve (four spares) series magnets with WST, IMP, IHEP, and BAMA efforts. The first MCBRD magnet built in China is the second prototype (P2) of the programme. This magnet was subjected to triggered energy extractions at CERN magnet test facility. The energy extraction is used for magnet protection, keeping voltage-to-ground and hot-spot temperature below 560 V and 250 K, respectively. A high magnetic-field change rate during the magnet discharge from high currents causes a substantial quench-back due to the heat generated by the eddy currents in the magnet formers. A specialized software, ProteCCT, was developed as part of the STEAM project to simulate such a unique quench behaviour. This contribution focuses on comparing measured results between the P1 and P2 magnets, and P2 quench measurement and simulation results. The correction factors available in the ProteCCT software allow matching the measured results. We identify measurements needed to refine simulation inputs further and improve the simulation predictive capability.