Performance of the Flipper monochromator at the wiggler/undulator at HASYLAB

After almost ten years of successful operation at a bending magnet beamline of HASYLAB, the Flipper monochromator was transferred to a 32-pole wiggler/undulator. With new grazing incidence optics the original energy range of 15-450 eV could be extended to more than 1500 eV. The gain in intensity is approximately two orders of magnitude. Undulator effects are observed between 36 and 900 eV and contribute considerably to this intensity gain. Monochromators of the Flipper type are ideally matching the emission characteristics of undulators. The main problem with wigglers at high energy storage rings in the heat load on the optical elements. (orig.)