Tools for Multipoles Magnetic Metrology at SOLEIL

SOLEIL Synchrotron is a set of 3 electron accelerators (LINAC, booster and storage ring). The 354 m circumference storage ring is dedicated to synchrotron radiation for fundamental and applied physics research. The most sensitive components of the storage ring are quadrupoles therefore manufacturing requirements are very strict. To check magnetic properties of the magnets (harmonics, magnetic axis position, magnetic tilt angle), it was necessary to measure entities at a lower level than the specifications required by the beam dynamics. Moreover measurements were to be durable during approximately six months as there were 160 quadrupoles to characterize and few tens of sextupoles to check. In this paper, we describe how was thought and optimized the SOLEIL bench and the way taken to avoid effects of manufacturing errors of the bench