1. Institute for Accelerator Science and Electromagnetic Fields, Technische Universität Darmstadt, Darmstadt, Germany
2. Helmholtz Institute Jena, Jena, Germany
3. Institute for Solid State Physics, Friedrich-Schiller-University Jena, Jena, Germany
4. Leibniz Institute of Photonic Technology, Jena, Germany
5. GSI Helmholtz Centre for Heavy Ion Research, Darmstadt, Germany