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Summary of Test Results of MQXFS1 - the First Short Model 150 mm Aperture Nb3Sn Quadrupole for the High-Luminosity LHC Upgrade

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Original languageEnglish
Article number4001705
JournalIEEE Transactions on Applied Superconductivity
Issue number3
Early online date2017
Publication statusPublished - 2018
Publication typeA1 Journal article-refereed


The development of Nb3Sn quadrupole magnets for the High-Luminosity LHC upgrade is a joint venture between the US LHC Accelerator Research Program (LARP)* and CERN with the goal of fabricating large aperture quadrupoles for the LHC interaction regions (IR). The inner triplet (low-$beta$) NbTi quadrupoles in the IR will be replaced by the stronger Nb3Sn magnets boosting the LHC program of having 10-fold increase in integrated luminosity after the foreseen upgrades. Previously LARP conducted successful tests of short and long models with up to 120 mm aperture. The first short 150 mm aperture quadrupole model MQXFS1 was assembled with coils fabricated by both CERN and LARP. The magnet demonstrated strong performance at the Fermilab's vertical magnet test facility reaching the LHC operating limits. This paper reports the latest results from MQXFS1 tests with changed pre-stress levels. The overall magnet performance, including quench training and memory, ramp rate and temperature dependence, is also summarized. * The US contributions to the HL-LHC upgrade will be under the US HL-LHC Accelerator Upgrade Project (US HL-LHC AUP)


  • Coils, Large Hadron Collider, Magnetic separation, Magnetomechanical effects, Stress, Superconducting magnets, Training, High Luminosity Large Hadron Collider (LHC), Nb3Sn magnets, interaction regions, low-β quadrupoles

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