DESIGN OF A 2 T MULTIPOLE WIGGLER INSERTION DEVICE FOR THE SRS

Two new identical insertion devices have been designed for the Daresbu ry SRS. They are 2T permanent-magnet multipole wigglers that will prov ide high Bur in the X-ray region. This paper describes the magnetic an d mechanical design of the arrays of steel pole pieces and permanent-m agnet blocks. Also given is the engineering design of the support stru cture that will cope with the very large forces present while maintain ing high levels of precision in gap setting and parallelism. The engin eering design has been fully assessed using finite-element techniques to predict the deflections of critical parts of the structure. These t wo devices are due to be installed into the SRS by the end of 1998.