Precision Alignment of Multipoles on Girders for NSLS-II
- Dr. Animesh Jain, Brookhaven National Laboratory
Monday, October 15, 10:00 AM - Special FRIB Seminar
NSCL Lecture Hall
The National Synchrotron Light Source-II (NSLS-II) is a new light source under construction at Brookhaven National Laboratory (BNL). Up to seven quadrupoles and sextupoles in the NSLS-II storage ring will be mounted on a common girder (~4-5 m long). These magnets must be aligned precisely to each other. The vibrating wire technique, first developed at Cornell, is being used to align the multipoles with a targeted precision of ±10 microns, well within the required tolerance of ±30 microns for the finally installed girder in the ring. Extensive R&D was carried out earlier to study sources of measurement errors and to improve accuracy. A fully automated system is now in use for production measurements and 76 assembled girders have been measured and aligned so far out of a total of 90 multipole girders. The R&D work that led to successful use of the vibrating wire technique, and the results obtained so far will be presented.