EXPERIMENTAL STUDY OF THERMAL DEFORMATION OF THE MAGNET GIRDER AT SRRC STORAGE RING

It is observed that the thermal-induced deformation of the magnet girder induces height levelling changes of the magnet and the beam position monitor (BPM). The electron beam motions will also be influenced. The deformation mechanism is studied and a new improving approach is proposed in this paper. A prototype was tested in the laboratory and storage ring. The girder can be kept stable at about ± 0.1μm per shift after improvement. Some design considerations of the dynamic behaviour of girder are also discussed.