Author Affiliations

James P. Cryan,^1,2,* J. Glownia,^1,3 N. Berrah,⁴ C. Blaga,⁵ J. D. Bozek,⁶ C. Buth,⁷ L. DiMauro,⁵ L. Fang,⁴ M. Guehr,¹ M. Hoener,⁴ J. Marangos,⁸ A. M. March,⁹ B. McFarland,^1,3 M. Trigo,¹ L. Young,⁹ P. H. Bucksbaum,^1,2,3 and Ryan N. Coffee^1,6

¹The PULSE Institute for Ultrafast Energy Science, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025 USA

²Department of Physics, Stanford University, Stanford, CA 94305 USA

³Department of Applied Physics, Stanford University, Stanford, CA 94305 USA

⁴Department of Physics, Western Michigan University, Kalamazoo, MI 49008 USA

⁵The Ohio State University, Department of Physics, Columbus, OH 43210 USA

⁶The Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025 USA

⁷Louisiana State University, Baton Rouge, LA 70803 USA

⁸Imperial College London, London UK

⁹Argonne National Labortory, Argonne, IL 60439 USA

^*Corresponding author: jcryan@stanford.edu