1. Department of Physics, York Plasma Institute, University of York, York YO10 5DQ, United Kingdom
2. STFC Rutherford Appleton Laboratory, Chilton, Oxon OX11 0QX, United Kingdom
3. Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
4. Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550, USA
5. Department of Physics, Ohio State University, Columbus, Ohio 43210-1117, USA
6. University of California San Diego, 9500 Gilman Drive 0411, La Jolla, California 92093-0411, USA
7. LULI, École Polytechnique, route de Saclay, 91128 Palaiseau Cedex, France
8. Graduate School of Engineering, Osaka University, Suita, Osaka 565087, Japan
9. Photon Pioneers Center, Osaka University, Suita, Osaka 565087, Japan
10. Laboratory for Laser Energetics (LLE), University of Rochester, 250E. River Rd., Rochester, New York 14623, USA
11. Institute Academic Initiatives, Osaka University, Suita, Osaka 5650871, Japan
12. University of Michigan, Ann Arbor, Michigan 48109-2099, USA
13. European XFEL GmbH, Holzkoppel 4, 22869 Schenefeld, Germany
14. General Atomics, P.O. Box 86508, San Diego, California 92186-5608, USA
15. Department of Physics, Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, United Kingdom