Magnet Design of the 150 mm Aperture Low- \beta Quadrupoles for the High Luminosity LHC

• Published in: IEEE transactions on applied superconductivity 2014-06, Vol.24 (3), p.1-6
• Main Authors: Ferracin, P., Ambrosio, G., Anerella, M., Borgnolutti, F., Bossert, R., Cheng, D., Dietderich, D. R., Felice, H., Ghosh, A., Godeke, A., Bermudez, S. Izquierdo, Fessia, P., Krave, S., Juchno, M., Perez, J. C., Oberli, L., Sabbi, G., Todesco, E., Yu, M.
• Format: Article
• Language: English
• Subjects: Applied sciences; Bladder; Coils; Cyclic accelerators and storage rings; Electrical engineering. Electrical power engineering; Electromagnets; Exact sciences and technology; Experimental methods and instrumentation for elementary-particle and nuclear physics; hbox{Nb}_{3}\hbox{Sn} magnets; High luminosity LHC (HL-LHC); interaction regions (IR); Large Hadron Collider; low- beta quadrupoles; Magnetomechanical effects; Niobium-tin; Nuclear physics; Physics; Stress; Superconducting magnets; Various equipment and components
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/TASC.2013.2284970

The high luminosity LHC (HL-LHC) project is aimed at studying and implementing the necessary changes in the LHC to increase its luminosity by a factor of five. Among the magnets that will be upgraded are the 16 superconducting low-β quadrupoles placed around the two high luminosity interaction regions (ATLAS and CMS experiments). In the current baseline scenario, these quadrupole magnets will have to generate a gradient of 140 T/m in a coil aperture of 150 mm. The resulting conductor peak field of more than 12 T will require the use of Nb 3 Sn superconducting coils. We present in this paper the HL-LHC low-β quadrupole design, based on the experience gathered by the US LARP program, and, in particular, we describe the support structure components to pre-load the coils, withstand the electro-magnetic forces, provide alignment and LHe containment, and integrate the cold mass in the LHC IRs.