Status of MQXFB Quadrupole Magnets for HL-LHC

Conference · Tue Sep 26 04:00:00 EDT 2023 · JACoW

DOI:https://doi.org/10.18429/JACoW-IPAC2023-WEPM060· OSTI ID:2349094

Milanese, Attilio ^[1]; Moros, Alice ^[1]; Ballarino, Amalia ^[1]; Vouris, Antonios ^[2]; Devred, Arnaud ^[1]; Petrone, Carlo ^[1]; Barth, Christian ^[1]; Duarte Ramos, Delio ^[1]; Ravaioli, Emmanuele ^[1]; Todesco, Ezio ^[1]; Mangiarotti, Franco ^[1]; Willering, Gerard ^[1]; Ambrosio, Giorgio ^[2]; Apollinari, Giorgio ^[2]; Prin, Herve ^[1]; Axensalva, Jerome ^[1]; Ferradas Troitino, Jose ^[1]; Fiscarelli, Lucio ^[1]; Baldini, Maria ^[2]; Guinchard, Michael ^[1] ; Crouvizier, Mickaël ^[1]; Lusa, Nicholas ^[1]; Ferracin, Paolo ^[3]; Quassolo, Penelope Matilde ^[1]; Rogacki, Piotr ^[1]; Principe, Rosario ^[1]; Carcagno, Ruben ^[2]; Feher, Sandor ^[2]; Sgobba, Stefano ^[1]; Russenschuck, Stephan ^[1]; Izquierdo Bermudez, Susana ^[1]; Strauss, Thomas ^[3]

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1. CERN
2. Fermilab
3. LBL, Berkeley

The MQXFB magnets are superconducting quadrupoles with nominal peak field on the conductor of 11.3 T. With their magnetic length of 7.2 m, they stand as the longest Nb3Sn accelerator magnets designed and manufactured up to now. Together with the companion MQXFA 4.2 m long units, built by the US Accelerator Research Program, they are at the heart of HL-LHC, as they shall replace the inner triplet quadrupoles at either side of the ATLAS and CMS interaction regions of the LHC. This technology has benefited from many years of development, and this specific design was validated with successful short models (MQXFS, 1.2 m long). More recently, several MQXFA magnets were shown to satisfy HL-LHC requirements. In this paper, we report on the cold test results of four MQXFB magnets, focusing on performance, training, behavior after thermal and powering cycles, and field quality. We then provide an update of the overall status, including ongoing verifications of design changes at the level of the coil fabrication.

• Research Organization: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 2349094
• Report Number(s): FERMILAB-CONF-23-0872-TD; oai:inspirehep.net:2717687
• Conference Information: Journal Name: JACoW Journal Volume: IPAC2023
• Country of Publication: United States
• Language: English

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