1. Magnetic Measurements of HL-LHC AUP Cryo-Assemblies at Fermilab
- Author
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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, and Wang, X
- Subjects
Nuclear and Plasma Physics ,Engineering ,Physical Sciences ,Superconducting magnets ,Magnetic field measurement ,Magnetic flux ,Electron tubes ,Current measurement ,Wires ,Probes ,Magnet alignment ,magnetic measurements ,superconducting magnet testing ,ATAP-2022 ,ATAP-GENERAL ,ATAP-SMP ,Condensed Matter Physics ,Electrical and Electronic Engineering ,Materials Engineering ,General Physics ,Electrical engineering ,Condensed matter physics - Abstract
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.
- Published
- 2022