Geometric Field Errors of Short Models for MQXF, the Nb3Sn Low-β Quadrupole for the High Luminosity LHC

Journal Article · Sun Apr 01 00:00:00 EDT 2018 · IEEE Transactions on Applied Superconductivity

DOI:https://doi.org/10.1109/tasc.2018.2793240· OSTI ID:1563950

Bermudez, Susana Izquierdo; Ambrosio, Giorgio; Bajas, Hugues; Chlachidze, Guram ; Troitino, Jose Ferradas; Ferracin, Paolo; Fiscarelli, Lucio ; Hagen, Per ; Holik, Eddie Frank; Marco, Joseph Di; Stoynev, Stoyan Emilov; Todesco, Ezio ; Sabbi, Gianluca ; Vallone, Giorgio ; Wang, Xiaorong

© 2002-2011 IEEE. In the framework of the high-luminosity upgrade of the large hadron collider, the U.S. LARP collaboration and CERN are jointly developing a 150-mm aperture Nb3Sn quadrupole for the Large Hadron Collider (LHC) interaction regions. Due to the large beam size and orbit displacement in the final focusing triplet, MQXF has challenging targets for field quality at nominal operation conditions. Three short model magnets have been tested and around 30 coils have been built, allowing a first analysis of the reproducibility of the coil size and turns positioning. The impact of the coil shimming on field quality is evaluated, with special emphasis on the warm magnetic measurements and the correlation to field measurements at cold and nominal field. The variability of the field harmonics along the magnet axis is studied by means of a Monte-Carlo analysis and the effects of the corrective actions implemented to suppress the low-order unallowed multipoles are discussed.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 1563950
• Journal Information: IEEE Transactions on Applied Superconductivity, Vol. 28, Issue 3; ISSN 1051-8223
• Country of Publication: United States
• Language: English