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Quench Protection Study of the Updated MQXF for the LHC Luminosity Upgrade (HiLumi LHC) | IEEE Journals & Magazine | IEEE Xplore

Quench Protection Study of the Updated MQXF for the LHC Luminosity Upgrade (HiLumi LHC)


Abstract:

In 2023, the LHC luminosity will be increased, aiming at reaching 3000 fb-1 integrated over ten years. To obtain this target, new Nb3Sn low-β quadrupoles (MQXF) have been...Show More

Abstract:

In 2023, the LHC luminosity will be increased, aiming at reaching 3000 fb-1 integrated over ten years. To obtain this target, new Nb3Sn low-β quadrupoles (MQXF) have been designed for the interaction regions. These magnets present a very large aperture (150 mm, to be compared with the 70 mm of the present NbTi quadrupoles) and a very large stored energy density (120 MJ/m3). For these reasons, quench protection is one of the most challenging aspects of the design of these magnets. In fact, protection studies of a previous design showed that the simulated hot spot temperature was very close to the maximum allowed limit of 350 K; this challenge motivated improvements in the current discharge modeling, taking into account the so-called dynamic effects on the apparent magnet inductance. Moreover, quench heaters design has been studied to be going into more details. In this paper, a protection study of the updated MQXF is presented, benefitting from the experience gained by studying the previous design. A study of the voltages between turns in the magnet is also presented during both normal operation and most important failure scenarios.
Published in: IEEE Transactions on Applied Superconductivity ( Volume: 26, Issue: 4, June 2016)
Article Sequence Number: 4001805
Date of Publication: 29 January 2016

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