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MQXC is a Nb-Ti quadrupole designed to meet the accelerator qualityrequirements needed for the phase-1 LHC upgrade, now superseded by the highluminosity upgrade foreseen in 2021. The 2-m-long model magnet was tested atroom temperature and 1.9 K. The technology developed for this magnet isrelevant for other magnets currently under development for the high-luminosityupgrade, namely D1 (at KEK) and the large aperture twin quadrupole Q4 (at CEA).In this paper we present MQXC test results, some of the specialized heatextraction features, spot heaters, temperature sensor mounting and voltage tapdevelopment for the special open cable insulation. We look at some problemsolving with noisy signals, give an overview of electrical testing, look at howwe calculate the coil resistance during at quench and show that the heaters arenot working We describe the quench signals and its timing, the development ofthe quench heaters and give an explanation of an Excel quench calculation andits comparison including the good agreement with the MQXC test results. Wepropose an improvement to the magnet circuit design to reduce voltage to groundvalues by factor 2. The program is then used to predict quench Hot-Spot andVoltages values for the D1 dipole and the Q4 quadrupole.

Models and experimental results from the wide aperture Nb-Ti magnets for the LHC upgrade