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ST398 - Nb3Sn High Field Magnets for the High Luminosity LHC Upgrade Project

Nb3Sn High Field Magnets for the High Luminosity LHC Upgrade Project
 
Giorgio Ambrosio
 
Fermi National Accelerator Laboratory
Batavia, IL 60510 USA
 
 
Abstract  The High Luminosity upgrade of the Large Hadron Collider at CERN requires a new generation of high field superconducting magnets. High field large aperture quadrupoles (MQXF) are needed for the low-beta triplets close to the ATLAS and CMS detectors, and high field two-in-one dipoles (11 T dipoles) are needed to make room for additional collimation. The MQXF quadrupoles, with a field gradient of 140 T/m in 150 mm aperture, have a peak coil field of 12.1 T at nominal current. The 11 T dipoles, with an aperture of 60 mm, have a peak coil field of 11.6 T at nominal current. Both magnets require Nb3Sn conductor and are the first applications of this superconductor to actual accelerator magnets.
Collaboration between the US LARP (LHC Accelerator Research Program) and CERN is developing the MQXF magnets, whereas the 11 T dipole magnets are being developed by CERN and Fermilab.
This paper reviews the status of Nb3Sn technology for accelerator magnets, discusses its main challenges, and discusses how the MQXF and 11 T designs are addressing them.

Work supported by the US Department of Energy through the US LHC Accelerator Research Program (LARP) and by the European Commission FP7 HiLumi LHC – Grant Agreement 284404.

Keywords (Index Terms) — High field magnets, HiLumi, LHC, Superconducting magnets.
 
IEEE/CSC & ESAS SUPERCONDUCTIVITY NEWS FORUM (global edition), October 2014.
Received August 26, 2014; Selected August 27, 2014.  Reference ST398; Category 5.
Preprint of ASC 2014 manuscript 4LOr2C-02 published online in IEEE Trans. Appl. Supercond.
(IEEE XPLORE)
 DOI: 10.1109/TASC.2014.2367024, on November 4, 2014
.