The Advanced Photon Source (APS) at the U.S. Department of Energy’s Argonne National Laboratory provides ultra-bright, high-energy X-ray beams for research in almost all scientific disciplines. (https://www.aps.anl.gov/About/Overview). The APS recently underwent major upgrades and can now generate X-ray beams up to 500 times brighter than before, making the APS one of the most powerful research tools in the world. The facility delivered its first light to a scientific beamline on June 17, 2024. The process of commissioning each of the beamlines scattered across the 35 sectors is rapidly proceeding, with all 71 beamlines expected to be operational over the course of the next year.

With the 75th ACA Annual Meeting being held less than 30 minutes away from the APS, we have worked with the directors of the APS and beamline scientists to provide a unique opportunity for ACA meeting attendees to tour the newly upgraded facility just as it is coming back online. On the afternoon of Monday, July 21, 2025, the ACA will bus up to 200 participants to the APS. Those participants will be given a boxed lunch and pre-sorted into twenty groups of ten individuals. The first ten groups will participate in three beamline tours, while the remaining ten will observe from two designated overview points above. Afterward, the groups will switch roles.