Chicago IL: Argonne Advanced Photon Source (APS)
The Advanced Photon Source (APS) at Argonne National Laboratory is a national synchrotron x-ray research facility funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences. The APS provides the brightest x-ray beams in the Western Hemisphere to more than 5,000 scientists worldwide.
https://www.aps.anl.gov/