1. Princeton Plasma Physics Laboratory, Princeton, New Jersey 08540, USA
2. University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
3. National Institutes for Quantum and Radiological Science and Technology, Naka, Ibaraki 311-0193, Japan
4. Kyushu University, Kasuga-kouen 6-1, Kasuga, Japan
5. Edgewood College, Madison, Wisconsin 53711, USA
6. The University of Tokyo, Kashiwa 277-8561, Japan
7. DECTRIS Ltd., 5405 Baden-Dättwil, Switzerland