The Advanced Photon Source
a U.S. Department of Energy Office of Science User Facility

American Physical Society Honors Decker

Senior Scientist Glenn Decker (APS) has been named a fellow of the American Physical Society, an honor limited to no more than one-half of one percent of the society’s membership of more than 50,000.

Decker’s fellowship recognizes his “outstanding contributions to the design, commissioning, and enhancement of synchrotron light sources, and for innovative developments in the field of particle beam diagnostics. In particular for the accelerator alignment technique necessary to reduce stray radiation background signals from photoemission-type photon beam position monitors and for the subsequent development of the largest deployment in the world of such monitors in a global closed-loop orbit feedback system.”

The alignment technique is known as the “Decker distortion.”

Decker served as Advanced Photon Source storage ring manager during the facility’s construction. He defined many of the technical specifications for ring components, including the structure of the orbit correction systems. He led the team that successfully commissioned the APS linac, positron accumulator ring, booster, associated transport lines and storage ring.

Decker also fully integrated photon beam position monitors into APS orbit correction systems, which now have the largest complement of closed-loop insertion device photon bpms in the world. He extended this technology to canted undulator beamlines.

He was awarded the University of Chicago Medal for Distinguished Performance in 1996 for his work as storage ring manager on APS design and commissioning.

The Advanced Photon Source at Argonne National Laboratory is one of five national synchrotron radiation light sources supported by the U.S. Department of Energy’s Office of Science to carry out applied and basic research to understand, predict, and ultimately control matter and energy at the electronic, atomic, and molecular levels, provide the foundations for new energy technologies, and support DOE missions in energy, environment, and national security. To learn more about the Office of Science x-ray user facilities, visit

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