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Quench Protection of the 11 T Nb3Sn Dipole for the High Luminosity LHC

Author:
Bermudez, Susana Izquierdo  Willering, Gerard  Bajas, Hugues  Bajko, Marta  Bordini, Bernardo  Bottura, Luca  Perez, Juan Carlos  de Rijk, Gijs  Savary, Frederic  


Journal:
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY


Issue Date:
2018


Abstract(summary):

The upgrade of the LHC collimation system requires the installation of 11 T Nb3Sn dipole magnets. Due to the large stored energy density and the low copper stabilizer section, the quench protection of these magnets is particularly challenging. A total of ten coils assembled in five single aperture and one double aperture short model magnets have been tested at CERN with different heater to coil insulation lay outs. This paper reports on the test results of the model program, which are used to validate numerical models and to optimize the quench protection performance. A parametric analysis on the impact of different conductor and operation parameters on the peak temperature is presented. Coil voltage to ground and turn-to-turn voltages are also evaluated under nominal conditions and failure case scenarios.


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