Magnetic Analysis of the MQXF Quadrupole for the High-Luminosity LHC

The high-luminosity upgrade of the Large Hadron Collider (HL-LHC) requires new high-field and large-aperture quadrupole magnets for the low-beta inner triplets (MQXF). The U.S. HiLumi-LHC Accelerator Upgrade and CERN are jointly developing a 150-mm aperture Nb 3 Sn magnet. Due to the large beam size...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2019-08, Vol.29 (5), p.1-5
Main Authors: Bermudez, Susana Izquierdo, Fiscarelli, Lucio, Ambrosio, Giorgio, Bajas, Hugues, Chlachidze, Guram, Ferracin, Paolo, DiMarco, Joseph, Stoynev, Stoyan Emilov, Todesco, Ezio, Sabbi, GianLuca, Vallone, Giorgio
Format: Article
Language:English
Subjects:
Apertures
Coils
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Cryogenic temperature
Current measurement
field quality
high field Nb3Sn magnet
high field Nb<inline-formula xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <tex-math notation="LaTeX"> _{3}</tex-math> </inline-formula>Sn magnet
High luminosity LHC
Large Hadron Collider
Luminosity
Magnetic field measurement
Magnetic measurement
magnetic measurements
Magnetic properties
Magnetism
Magnets
Quadrupoles
Saturation magnetization
Superconducting magnets
Temperature measurement
Transfer functions
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Summary:The high-luminosity upgrade of the Large Hadron Collider (HL-LHC) requires new high-field and large-aperture quadrupole magnets for the low-beta inner triplets (MQXF). The U.S. HiLumi-LHC Accelerator Upgrade and CERN are jointly developing a 150-mm aperture Nb 3 Sn magnet. Due to the large beam size and orbit displacement in the final focusing triplet, MQXF has challenging field quality targets at collision energy. Magnetic measurements have been performed both at ambient and cryogenic temperatures in the four short models that were built and tested. This paper presents the magnetic analysis, comparing field measurements with the expectations and the field quality requirements. The analysis is focused on the geometrical harmonics and iron saturation effect, including three-dimensional effects and transfer function repeatability. Persistent currents and dynamic effects are also discussed.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2019.2897848