Superconducting quadrupole magnets for the interaction regions of the Large
Hadron Collider are being developed by the US-LHC Accelerator Project. The
se 70 mm bore quadrupole magnets are intended to operate in superfluid heli
um at 1.9 K with a nominal field gradient of 215 T/m. A series of 2 m model
magnets has been built and cold tested at Fermilab to optimize their desig
n and construction and to study the performance of the magnets. Field measu
rements of the 8 model magnets and comparisons with the required field qual
ity are reported in this paper.