Rial, E.; Bahrdt, J.; Meseck, A.; Scheer, M.; Grimmer, S.; Kuhn, C.; Volz, P.; Bakos, J.; Gaebel, S.; Gottschlich, S.; Karimi, K.; Laube, F.; Rogosch-Opolka, A.: Undulators for BESSY III. In: Ralph Assmann [Ed.] : IPAC'23 : Proceedings of the 14th International Particle Accelerator Conference ; Venice, Italy from 7 to 12 May 2023Geneva: JACoW, 2023. - ISBN 978-3-95450-231-8, p. MOPM103/1-4
Open Access Version
Abstract:
HZB is in the process of developing a concept for a successor to the BESSY II synchrotron facility. The new facility will build on the strengths developed in Berlin over the last twenty years in delivering flexibly polarised soft X-Rays to dozens of beamlines. The successor facility BESSY III is planned to operate at 2.5GeV, in comparison to the 1.7GeV operation of BESSY II. This makes it easier to achieve the goal of delivering 1keV photons to beamlines on the first harmonic of our APPLE II Insertion Devices. It also makes it easier to achieve the aspiration of delivering tender X-Rays up to 10keV more routinely to users utilising in-vacuum APPLE II devices*, Cryogenic Permanent Magnet Undulators (CPMUs) or Cryogenic APPLE devices[2]. However, it also presents challenges in delivering the low energy photons below 10 eV, as period lengths of the relevant undulators must be increased, which in turn increases on-axis power. APPLE-KNOT designs will be pursued to overcome this issue.