Bahrdt, J.; Bäcker, H.-J.; Frentrup, W.; Rethfeldt, C.; Scheer, M.; Schulz, B.; Gottschlich, S.: A Canted Double Undulator System with a Wide Energy Range for EMIL. In: Proceedings of IPAC2015, Richmond, VA, USA , 2015. - ISBN 978-3-95450-168-7, p. TUPWA019/1-3
https://jacowfs.jlab.org/conf/proceedings/IPAC2015/papers/tupwa019.pdf
Open Access Version
Abstract:
At BESSY II a canted double undulator system for the Energy Materials In-situ Laboratory EMIL is under construction. The energy regime is covered with two undulators, an APPLE II undulator for the soft and a cryogenic permanent magnet undulator CPMU-17 for the hard photons. The layout and the performance of the undulators are presented in detail. The minimum of the vertical betatron function is shifted to the center of the CPMU-17. The neighboring quadrupoles and an additional quadrupole between the undulators control the vertical betatron function. Prior to the undulator installation a testing chamber with four movable vertical scrapers has been implemented at the CPMU-17 location. Utilizing the scrapers the new asymmetric lattice optics will be tested and optimized.