Publikationsrepositorium - Helmholtz-Zentrum Dresden-Rossendorf

We consider an experiment to test nonlinear QED by light-by-light-scattering: An intense optical laser pulse generates in a perfect vacuum a field which induces birefringence of the vacuum. That birefringence is measured with an XFEL beam and state-of-the-art X-ray polarimetry. We calculate for planned facilitites the phase shift, ellipticity and photon numbers per shot. In addition, we consider shot-to-shot fluctuations and beam-arrival-jitter, and derive required integration times.