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Under the U.S. High Luminosity LHC Accelerator Upgrade Project (HL-LHC AUP),the 150 mm bore, high-field Nb3Sn low-\b{eta} MQXFA quadrupole magnets arebeing fabricated, assembled and tested, in the context of the CERNHi-Luminosity LHC (HL-LHC) upgrade. These magnets have 4.2 m magnetic lengthand 4.56 m long iron yoke. To date, eight MQXFA magnets have been tested. Oneof the magnets additionally underwent a successful endurance test with 40triggered quenches, and two magnets did not perform as expected. This worksummarizes for the first time the available strain gauge data from eightidentical Nb3Sn MQXFA tested magnets, focusing on the endurance test, and on apossible cause of underperformance of the two magnets that did not pass thevertical test. We applied methods to prevent this from happening in futureMQXFA magnets, which shown to be effective for last two tested magnets.

Analysis of the mechanical performance of the 4.2 m long MQXFA magnets for the Hi-Lumi LHC Upgrade