VIBRATING WIRE R&D FOR ALIGNMENT OF MULTIPOLE MAGNETS IN NSLS-II

The alignment tolerance for a string of quadrupoles and sextupoles on a ~5 m long girder in the proposed light source NSLS-II at BNL is ±30 µm. In view of difficulties in achieving this tolerance by conventional fiducialization and survey, it is decided to align several magnets installed on a girder based on magnetic measurements using the vibrating wire technique. In order to develop the technique with improved accuracy and to ultimately build a fully automated system suitable for large scale production work, an R&D program has been ongoing at BNL. Results obtained using an R&D set up in both quadrupole and sextupole magnets are presented.