  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 profile. A
multi-probe, PCB-based rotating coil and 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.
