1 Department of Physics and Astronomy, Science and Technology, Aarhus University2 Interdisciplinary Nanoscience Center - INANO-Fysik, Ny Munkegade, Interdisciplinary Nanoscience Center, Science and Technology, Aarhus University3 Institute for Nuclear Physics, Mainz4 Department of Geoscience - Geology, C.F. Møllers Allé, Department of Geoscience, Science and Technology, Aarhus University5 Department of Geoscience - Geology, C.F. Møllers Allé, Department of Geoscience, Science and Technology, Aarhus University6 Department of Physics and Astronomy, Science and Technology, Aarhus University
Experiments have been performed at the Mainz Microtron MAMI to explore the radiation emission spectra from a crystalline undulator at electron beam energies of 270 and 855 MeV. The epitaxially grown graded composition strained layer Si1-xGex undulator had 4-period with a period length View the MathML source. Spectra taken at the beam energy of 270 MeV at channeling in the undulating (110) planes exhibit a broad excess yield around the theoretically expected photon energies of 0.069 MeV, as compared with a flat silicon reference crystal. Model calculations on the basis of synchrotron-like radiation emission from finite single arc elements, taking into account also coherence effects, suggest that evidence for a weak undulator effect has been observed for the first time for electrons.
Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions With Materials and Atoms, 2013, Vol 309, p. 37-44