1. Helmholtzzentrum GSI-Darmstadt, Planckstr. 1, Darmstadt, Germany
2. Goethe University, Frankfurt, Max-von-Laue-Str. 1, Frankfurt am Main, Germany
3. Institute of Optics and Quantum Electronics, Abbe Center of Photonics, University Jena, Max-Wien-Platz 1, Jena, Germany
4. Helmholtz-Institute Jena, Fröbelstieg 3, Jena, Germany
5. Joint Institute for high Temperatures of RAS, Izhorskaya St. 13, Moscow, Russia
6. Moscow Institute of Physics and Technology (State University), Institutskiy Pereulok 9, Dolgoprudny, Russia