Fast automated energy changes at synchrotron radiation beamlines equipped with transfocator or focusing mirrors

Journal Article · 15 February 2022 · Journal of Synchrotron Radiation (Online)

DOI: https://doi.org/10.1107/s1600577522001084 · OSTI ID:1868966

Stepanov, Sergey  ^[1]; Kissick, David ^[1]; Makarov, Oleg ^[1]; Hilgart, Mark ^[1]; Becker, Michael ^[1]; Venugopalan, Nagarajan ^[1]; Xu, Shenglan ^[1]; Smith, Janet L. ^[2]; Fischetti, Robert F.  ^[1]

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1. Argonne National Lab. (ANL), Argonne, IL (United States)
2. Univ. of Michigan, Ann Arbor, MI (United States)

Algorithms and procedures to fully automate retuning of synchrotron radiation beamlines over wide energy ranges are discussed. The discussion is based on the implementation at the National Institute of General Medical Sciences and the National Cancer Institute Structural Biology Facility at the Advanced Photon Source. When a user selects a new beamline energy, software synchronously controls the beamline monochromator and undulator to maintain the X-ray beam flux after the monochromator, preserves beam attenuation by determining a new set of attenuator foils, changes, as needed, mirror reflecting stripes and the undulator harmonic, preserves beam focal distance of compound refractive lens focusing by changing the In/Out combination of lenses in the transfocator, and, finally, restores beam position at the sample by on-the-fly scanning of either the Kirkpatrick–Baez mirror angles or the transfocator up/down and inboard/outboard positions. The sample is protected from radiation damage by automatically moving it out of the beam during the energy change and optimization.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States)
• Sponsoring Organization: National Institutes of Health (NIH), National Cancer Institute; National Institutes of Health (NIH), National Institute of General Medical Sciences; USDOE Office of Science (SC)
• Grant/Contract Number: AC02-06CH11357
• OSTI ID: 1868966
• Journal Information: Journal of Synchrotron Radiation (Online), Journal Name: Journal of Synchrotron Radiation (Online) Journal Issue: 2 Vol. 29; ISSN 1600-5775
• Publisher: International Union of CrystallographyCopyright Statement
• Country of Publication: United States
• Language: English