Analysis of the Mechanical Performance of the 4.2-m-Long MQXFA Magnets for the Hi-Lumi LHC Upgrade

Journal Article · Mon Mar 27 00:00:00 EDT 2023 · IEEE Transactions on Applied Superconductivity

DOI:https://doi.org/10.1109/tasc.2023.3262211· OSTI ID:1969694

Garcia Fajardo, L.  ^[1]; Ambrosio, G.  ^[2]; Yahia, A. Ben ^[3]; Cheng, D. W.  ^[1]; Ferracin, P.  ^[1]; Ferradas Troitino, J.  ^[4]; Izquierdo Bermudez, S.  ^[4]; Muratore, J.  ^[3]; Prestemon, S.  ^[1]; Ray, K. L.  ^[1]; Solis, M. ^[1]; Vallone, G.  ^[1]

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1. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
2. Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
3. Brookhaven National Laboratory (BNL), Upton, NY (United States)
4. European Organization for Nuclear Research (CERN), Geneva (Switzerland)

Under the U.S. High Luminosity LHC Accelerator Upgrade Project (HL-LHC AUP), the 150 mm bore, high-field Nb₃Sn low-{eta}_MQXFA quadrupole magnets are being fabricated, assembled and tested, in the context of the CERN Hi-Luminosity LHC (HL-LHC) upgrade. These magnets have 4.2 m magnetic length and 4.56 m long iron yoke. To date, eight MQXFA magnets have been tested. One of the magnets additionally underwent a successful endurance test with 40 triggered quenches, and two magnets did not perform as expected. This work summarizes for the first time the available strain gauge data from eight identical Nb₃Sn MQXFA tested magnets, focusing on the endurance test, and on a possible cause of underperformance of the two magnets that did not pass the vertical test. Here we applied methods to prevent this from happening in future MQXFA magnets, which shown to be effective for last two tested magnets.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Grant/Contract Number: AC02-07CH11359
• OSTI ID: 1969694
• Report Number(s): FERMILAB-PUB-23-116-TD; arXiv:2303.16795; oai:inspirehep.net:2647087
• Journal Information: IEEE Transactions on Applied Superconductivity, Vol. 33, Issue 5; ISSN 1051-8223
• Publisher: IEEE
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
large Hadron collider
strain measurement
stress measurement
superconducting magnets