1. Experimental Physics
VI, Julius Maximilian University of Würzburg, 97074 Würzburg, Germany
2. National Institutes for Quantum and Radiological Science and Technology (QST), Takasaki, Gunma 370-1292, Japan
3. Faculty of Science and Technology, Gunma University, Kiryu, Gunma 376-8515, Japan
4. Graduate School of Science and Engineering, Saitama University, Saitama 338-8570, Japan
5. Bavarian Center for Applied Energy Research (ZAE Bayern), 97074 Würzburg, Germany