• S. Bettoni
  CERN, Geneva
• B. Bolli, S. Ceravolo, S. Guiducci, F. Iungo, M.A. Preger, P. Raimondi, C. Sanelli, F.M. Sardone
  INFN/LNF, Frascati (Roma)

The wig­glers of the DAΦNE main rings have been one of the main sources of the non-lin­ear­i­ties in the col­lid­er. A method to min­i­mize the odd in­te­grat­ed mul­ti­poles around the beam tra­jec­to­ry (the even ones tend to van­ish due to the pe­ri­od­ic­i­ty of the de­vice) is de­scribed. It con­sists in dis­plac­ing the mag­net­ic axis of each pole to­wards the po­si­tion of the beam in such a way that the in­te­grat­ed odd mul­ti­poles are min­i­mized in each half pe­ri­od of the wig­gler. After a study, in­clud­ing mul­ti­po­lar and track­ing anal­y­sis, has per­formed to de­ter­mine the best po­si­tion of the axes, the wig­glers in the DAΦNE main rings have been mod­i­fied ac­cord­ing­ly. To val­i­date this ap­proach mag­net­ic mea­sure­ments and tests with beam by means of closed orbit bumps have been per­formed.