1. Department of Medical Physics, Faculty of Physics, Ludwig-Maximilians-Universität München, 85748 Garching bei München, Germany
2. ELI-ALPS, ELI-HU Non-Profit Ltd., Wolfgang Sandner utca 3., Szeged H-6728, Hungary
3. Accelerator Technology and Applied Physics Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
4. Department of Radiation Oncology, University Hospital, LMU München, 80337 München, Germany
5. Oncotherapy Department, University Szeged, Szeged 6728, Hungary