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DiMarco, J.; Akella, P.; Ambrosio, G.; Assell, D.; Baldini, M.; Chlachidze, G.; Feher, S.; Ghiorso, W.; Nogiec, J.; Nikolic, V.; Stoynev, S.; Strauss, T.; Tartaglia, M.; Thompson, P.; Walbridge, D.; Wang, X.
IEEE transactions on applied superconductivity, 09/2022, Volume: 32, Issue: 6Journal Article
LQXFA/B production series cryogenic assemblies are being built for the LHC upgrade by the HL-LHC Accelerator Upgrade Project (AUP). These contain a pair of MQXFA quadrupole magnets combined as a cold mass within a vacuum vessel, and are to be installed in the IR regions of the LHC. The LQXFA/B are being tested at 1.9 K to assess alignment and magnetic performance at Fermilab's horizontal test facility. The ∼10 m long assembly must meet stringent specifications for quadrupole strength and harmonic field integrals determination, magnetic axis location, and for variations in axis position and local field profiles. A multi-probe, PCB-based rotating coil and a Single Stretched Wire system are employed for these measurements. To accurately determine rotating coil location and angles within the cold mass, a laser tracker is utilized to record multiple targets at one end of the probe. This paper describes the measurements, probes/equipment, and techniques used to perform the necessary characterization of the cold mass.
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