Superconductivity News Forum (SNF)
Full Text, PDFAdvanced Quench Protection for the Nb3Sn Quadrupoles for the High Luminosity LHC
E. Ravaioli1, B. Auchmann2, V.I. Datskov3, J. Blomberg Ghini4, K. Dahlerup-Petersen2, A.M. Fernandez Navarro2, G. Kirby2, M. Maciejewski5, F. Rodriguez Mateos2, H.H.J. ten Kate1, and A.P. Verweij2
1CERN, Switzerland, and with the University of Twente, Enschede, The Netherlands
2CERN, Switzerland
3CERN, Switzerland. He is now with GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany
4CERN, Switzerland, and with the Norwegian University of Science and Technology, Trondheim, Norway
3CERN, Switzerland. He is now with GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany
4CERN, Switzerland, and with the Norwegian University of Science and Technology, Trondheim, Norway
5CERN, Switzerland, and with Institute of Automatic Control, Technical University of Łódź, 18/22 Stefanowskiego St., Poland
E-mail: [email protected]
Abstract — The goal of the High Luminosity LHC project is upgrading the LHC in order to increase its luminosity by a factor five. To achieve this, twenty-four 150 mm aperture, 12 T, Nb3Sn quadrupole magnets are to be installed close to the two interaction regions at ATLAS and CMS. This new generation of high-field magnets poses a significant challenge concerning the protection of the coils in the case of a quench. The very high stored energy per unit volume requires a fast and effective quench heating system in order to limit the hot-spot temperature and hence avoid damage due to overheating. Conventional protection systems based on quench heaters have a limited response time due to the thermal insulation between the heater and the coil. An advanced solution for the protection of high-field magnets is the CLIQ (Coupling-Loss Induced Quench) system, recently developed at CERN. Due to its fast intra-wire energy-deposition mechanism, CLIQ is a very effective, yet electrically robust, quench protection system. Various protection scenarios including quench heaters, CLIQ, or combinations of the two methods are analyzed and discussed, with the aim of minimizing the coil’s hot-spot temperature and thermal gradients during the discharge. The proposed design assures a fully redundant system.
Keywords (Index Terms) — Accelerator magnet, circuit modeling, CLIQ, quench protection, superconducting coil.
IEEE/CSC & ESAS SUPERCONDUCTIVITY NEWS FORUM (global edition), January 2016.
Submitted September 12, 2015; Selected October 9, 2015. Reference No. ST487; Category 6.
EUCAS 2015 preprint 3A-LS-P-02.07. Submitted to IEEE Trans. Appl. Supercond. for possible publication.
Submitted September 12, 2015; Selected October 9, 2015. Reference No. ST487; Category 6.
EUCAS 2015 preprint 3A-LS-P-02.07. Submitted to IEEE Trans. Appl. Supercond. for possible publication.