Preload Characterization of Short Models of MQXF the Nb ₃ Sn Low-β Quadrupole for the Hi-Lumi LHC

Journal Article · Mon Jun 01 00:00:00 EDT 2020 · IEEE Transactions on Applied Superconductivity

DOI:https://doi.org/10.1109/TASC.2020.2973119· OSTI ID:1606209

Takala, Eelis  ^[1]; Ambrosio, Giorgio  ^[2]; Bourcey, Nicolas  ^[1]; Cheng, Daniel W.  ^[3]; Ferracin, Paolo  ^[1]; Guinchard, Michael ^[1]; Bermudez, Susana Izquierdo  ^[1]; Mangiarotti, Franco  ^[1]; Pan, Heng  ^[3]; Perez, Juan Carlos ^[1]; Prestemon, Soren  ^[3]; Vallone, Giorgio  ^[3]; Strauss, Thomas  ^[2]

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1. European Organization for Nuclear Research (CERN), Geneva (Switzerland)
2. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

MQXF is the Nb3Sn Low-β Quadrupole magnet that the HL-LHC project is planning to install in the LHC interaction regions in 2026 as part of an upgrade to increase the LHC inte-grated luminosity by about a factor of ten. The magnet will be fab-ricated in two different lengths: 4.2 m for MQXFA, built in the US by the Accelerator Upgrade Project (AUP), and 7.15 m for MQXFB, fabricated by CERN. In order to qualify the magnet de-sign and characterize its performance with different conductors, cable geometries and pre-load configuration, five short model magnets, called MQXFS, were fabricated, assembled and tested. The latest model, MQXFS6, uses a new powder-in-tube (PIT) su-perconducting wire, featuring a bundle barrier surrounding the filaments. The coil and the support structure were equipped with strain gauges and optical fibres to monitor strain during assembly, cool-down and excitation. In this paper we further develop the conventional azimuthal preload analysis and introduce a new set of tools for MQXF coil pack characterization which we use to an-alyse the behaviour of MQXFS6 room temperature preload and to reanalyse all the short models tested at CERN. A comparison is made between all the studied magnets revealing new characteriz-ing preload parameters.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Grant/Contract Number: AC02-07CH11359
• OSTI ID: 1606209
• Report Number(s): FERMILAB-PUB-20-119-TD; oai:inspirehep.net:1788088; TRN: US2104482
• Journal Information: IEEE Transactions on Applied Superconductivity, Vol. 30, Issue 4; ISSN 1051-8223
• Publisher: Institute of Electrical and Electronics Engineers (IEEE)
• Country of Publication: United States
• Language: English

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