As part of the magnet R&D program for the Large Hadron Collider (LHC), CEA Saclay has designed and built two 3-m-long, 56-mm-twin-aperture arc quadrupole magnet prototypes. Extensive harmonic field measurements were performed during the cold test of the second prototype, using a newly developed magnetic measurement system. After a brief description of the new system, a review of the field quality data as a function of axial position and current is presented.

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