BEAM BASED MEASUREMENTS WITH THE MODIFIED WIGGLERS IN DAFNE

A novel idea to minimize the odd high order non-linearities in periodic magnets has been presented in other articles in the past. The optimization of this method on the wigglers of the main rings in DAFNE has been performed by means of multipolar and tracking analysis. After the magnetic measurements on a spare wiggler confirmed the accuracy of the magnetic model used for the optimization, all the insertion devices in the main rings have been modified accordingly. In fall last year tune variation measurements as a function of the closed orbit bumps amplitude around the wigglers confirmed the validity of the proposed technique. In this paper these beam based measurements are presented.