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Advanced Photon Source Upgrade in Progress, User Experiments Paused

Aerial photo of the Advanced Photon Source. (Courtesy of Argonne National Laboratory.)

On April 17, 2023, the Advanced Photon Source (APS) began a comprehensive upgrade to replace its original electron storage ring with a new, state-of-the-art accelerator. This effort will increase the brightness of APS X-ray beams by up to 500 times, and new beamlines will be constructed to take advantage of these improved capabilities.

The upgraded APS will return to operation in Spring 2024 after the 12-month installation and commissioning period, although initial operations will be at reduced current and availability as the machine is tuned up. Beamlines will come online at different points following the shutdown. Every APS beamline will undergo operational, technical, and scientific commissioning before restarting. Check the upgrade website for regular updates.