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LQXFA&#x002F;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&#x002F;B are being tested at 1.9 K to assess alignment and magnetic performance at Fermilab&#x0027;s horizontal test facility. The &#x223C;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&#x002F;equipment, and techniques used to perform the necessary characterization of the cold mass.

Magnetic Measurements of HL-LHC AUP Cryo-Assemblies at Fermilab