Plot from the APS accelerator logs signifying first turns of electrons in the new storage ring.

Advanced Photon Source Commisionsing Begins; Electrons Circulate in the New Storage Ring

The Advanced Photon Source (APS) Upgrade project officially moved into a new phase on April 10, 2024, as commissioning of the new storage ring began.

The start of commissioning follows a successful Accelerator Readiness Review (ARR) conducted from March 25-28, and the subsequent approval from the DOE Argonne Site Office. It marks a major milestone in the upgrade project and a big step toward bringing the rejuvenated APS facility to life. Electrons have made their way around the new Advanced Photon Source (APS) storage ring for the first time, a major milestone in the process of bringing the newly upgraded APS into operation.

The upgrade of the APS has been in the planning stages for a decade. Over the past year, the team has removed the original storage ring and assembled not just the 200 modules of the new one, but literally thousands of associated components and systems in its place, followed by a thorough test and checkout of the new systems. The new electron storage ring has been designed to generate X-ray beams that will be up to 500 times brighter than those of the original APS.

The commissioning process is expected to take much of the next two months to complete, as the Accelerator Systems Division (ASD) begins circulating electrons in the ring, putting the new accelerator through its paces and bringing it up to operational levels.

On April 13, 2024, members of the Accelerator Systems Division (ASD) injected an electron bunch into the new storage ring and confirmed that it traveled the full circumference. Electron bunches injected on April 14, 2024, have now circulated more than a dozen times. This is not only a first, but an important step for the new machine, as the smallest obstruction, misalignment or power supply oscillation (for example) can affect the trajectory of an electron beam. With such a low-emittance beam, even miniscule changes such as these would be detrimental.

“Circulating beam around the storage ring is a major accomplishment, and the entire team – construction and commissioning – should be proud of the work done to get us to this point,” said Jim Kerby, director of the APS Upgrade project.

“This initial result is a testament to the work of hundreds of people both at Argonne and literally around the globe over the decade,” Kerby said. “We’re very pleased the commissioning team under the leadership of Vadim Sajaev has achieved this milestone and look forward to their continued efforts to safely commission and fully understand the new machine.”

Read more about this remarkable next step for the APS. 


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