Commissioning of the first insertion devices at SOLEIL

The 2.75 GeV storage ring of the SOLEIL third generation light source in France consists of 16 cells and 24 straight sections (4times12 m,12times7 m, 8times3.6 m) for a total circumference of 354 m. Twenty-four insertion devices (IDs) are planned for providing high brilliance radiation from UV to hard X ray. They consist of adjustable polarisation sources in the UV-soft X ray (electromagnetic devices of periods 640 mm and 256 mm, APPLE-II type undulators of periods ranging between 80 and 34 mm) and planar devices for the production of hard X-ray (in vacuum undulators of period 20 or 24 mm and one 50 mm period in vacuum wiggler). During the commissioning of the presently installed ten IDs (HU640, 3timesHU256, 3timesHU80, 3timesU20), the effects on the beam have been studied in terms of closed orbit distortions (CODs), tune shifts, additional coupling and compared with the expectations from magnetic measurements in the laboratory. The COD was compensated using a Feed ForWard (FFW) with local correctors. The radiation observed at the beam lines is also analysed.