• Bahrdt, J.; Bakos, J.; Frentrup, W.; Gottschlich, S.; Grimmer, S.; Kuhn, C.; Rethfeldt, C.; Rogosch-Opolka, A.; Scheer, M.; Schulz, B.; Ziemann, L.: Status of the Cryogenic Undulator CPMU-17 for EMIL at BESSY II / HZB. In: Gianluigi Arduini ... [Ed.] : Proceedings of IPAC, Copenhagen, Denmark, 2017JaCOW, 2017. - ISBN 978-3-95450-182-3, p. 1372-1374
    http://accelconf.web.cern.ch/AccelConf/ipac2017/papers/tupab026.pdf

Open Access Version

Abstract:
The CPMU-17 is the hard X-ray radiation source of a canted double undulator system for the Energy Materials In-situ Laboratory EMIL at BESSY II [1]. Various ambitious concepts are realized in this undulator such as Dy-hardened PrFeB-magnets, direct liquid Nitrogen cooling, dual loop feedback gap drive based on an optical micrometer and a low permeability stainless steel In-Vacuum(IV)-girder without keepers. The magnets are sorted according to Helmholtz coil and stretched wire data. Reproducibility and accuracy measurements of two IV-measurement tools needed for the CPMU-17 are presented: an IV-Hall probe bench and an IV-Moving Wire.