Demonstration of harmonic interaction in an undulator up to the 15th order
D. Xiang, E. Hemsing, M. Dunning, C. Hast, T. O. Raubenheimer, S. Weathersby, and F. Fu
Phys. Rev. ST Accel. Beams 16, 110701 (2013) - Published 12 November, 2013
Obtaining high degree of circular polarization at x-ray free electron lasers via a reverse undulator taper
E. A. Schneidmiller and M. V. Yurkov
Phys. Rev. ST Accel. Beams 16, 110702 (2013) - Published 27 November, 2013