Challenges and Lessons Learned from fabrication, testing and analysis of eight MQXFA Low Beta Quadrupole magnets for HL-LHC
Abstract
By the end of October 2022, the US HL-LHC Accelerator Upgrade Project (AUP) had completed fabrication of ten MQXFA magnets and tested eight of them. The MQXFA magnets are the low beta quadrupole magnets to be used in the Q1 and Q3 Inner Triplet elements of the High Luminosity LHC. This AUP effort is shared by BNL, Fermilab, and LBNL, with strand verification tests at NHMFL. An important step of the AUP QA plan is the testing of MQXFA magnets in a vertical cryostat at BNL. The acceptance criteria that could be tested at BNL were all met by the first four production magnets (MQXFA03-MQXFA06). Subsequently, two magnets (MQXFA07 and MQXFA08) did not meet some criteria and were disassembled. Lessons learned during the disassembly of MQXFA07 caused a revision to the assembly specifications that were used for MQXFA10 and subsequent magnets. In this paper, we present a summary of: 1) the fabrication and test data of all the MQXFA magnets; 2) the analysis of MQXFA07/A08 test results with characterization of the limiting mechanism; 3) the outcome of the investigation, including the lessons learned during MQXFA07 disassembly; and 4) the finite element analysis correlating observations with test performance.
Keywords
Cite
@article{arxiv.2301.09523,
title = {Challenges and Lessons Learned from fabrication, testing and analysis of eight MQXFA Low Beta Quadrupole magnets for HL-LHC},
author = {G. Ambrosio and K. Amm and M. Anerella and G. Apollinari and G. Arnau Izquierdo and M. Baldini and A. Ballarino and C. Barth and A. Ben Yahia and J. Blowers and P. Borges De Sousa and R. Bossert and B. Bulat and R. Carcagno and D. W. Cheng and G. Chlachidze and L. Cooley and M. Crouvizier and A. Devred and J. DiMarco and S. Feher and P. Ferracin and J. Ferradas Troitino and L. Garcia Fajardo and S. Gourlay and H. M. Hocker and S. Izquierdo Bermudez and P. Joshi and S. Krave and E. M. Lee and J. Levitan and V. Lombardo and J. Lu and M. Marchevsky and V. Marinozzi and A. Moros and J. Muratore and M. Naus and F. Nobrega and T. Page and I. Pong and J. C. Perez and S. Prestemon and E. Ravaioli and K. L. Ray and G. Sabbi and J. Schmalzle and J. Seyl and S. Sgobba and S. Stoynev and T. Strauss and E. Todesco and D. Turrioni and G. Vallone and R. Van Weelderen and P. Wanderer and X. Wang and M. Yu},
journal= {arXiv preprint arXiv:2301.09523},
year = {2023}
}