Design and testing of multipole magnets for the Daresbury synchrotron radiation source

The multipole magnets for the Synchrotron Radiation Source at Daresbury Laboratory are of a novel design and allow the generation of many different field harmonics in a single magnet. In addition to providing a powerful sextupole field for chromaticity correction other fields ranging from dipole to decapole can be produced in both normal and skew orientations. The redesign of the magnet following experience gained with a prototype is described and the results of magnetic measurements on 18 production magnets are presented. Some details of the method of computer control of the windings are also given.