Protecting a full-scale Nb3Sn magnet with CLIQ, the new coupling-loss-induced quench system

E. Ravaioli, H. Bajas, V.I. Datskov, V. Desbiolles, J. Feuvrier, G. Kirby, M. Maciejewski, G. Sabbi, H.H.J. ten Kate, A.P. Verweij

Research output: Contribution to journalArticleAcademicpeer-review

21 Citations (Scopus)


A new protection system for superconducting magnets called coupling-loss induced quench system (CLIQ) has been recently developed at CERN. Recent tests on Nb-Ti coils have shown that CLIQ is a valid, efficient, and promising method for the protection of high-magnetic-field superconducting magnets. However, the protection of new-generation Nb3Sn accelerator magnets is even more challenging due to the much higher stored energy per unit volume and to the significantly larger enthalpy needed to initiate and propagate a normal zone in such coils. Now, the CLIQ system is tested for the first time on a Nb3Sn magnet in the CERN magnet test facility in order to investigate its performance in practice, thereby validating the method for this type of superconducting magnets as well. Furthermore, we successfully reproduced the electrothermal transients during a CLIQ discharge. Finally, the implementation of various CLIQ-based protection schemes for the full-scale Nb3Sn quadrupole magnet for the LHC high luminosity upgrade is discussed. The impact of key system parameters on CLIQ performance and the advantages and drawbacks of using multiple CLIQ units on a single magnet are discussed.
Original languageEnglish
Article number4001305
Pages (from-to)-
Number of pages5
JournalIEEE transactions on applied superconductivity
Issue number3
Publication statusPublished - 2015


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