Journal
JOURNAL OF SYNCHROTRON RADIATION
Volume 29, Issue -, Pages 393-399Publisher
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S1600577522001084
Keywords
synchrotron radiation; beamline automation; macromolecular crystallography
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Funding
- National Cancer Institute [ACB-12002]
- National Institute of General Medical Sciences [AGM-12006, P30 GM138396]
- DOE Office of Science [DE-AC02-06CH11357]
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This paper discusses algorithms and procedures for fully automating the retuning of synchrotron radiation beamlines over wide energy ranges. Based on implementations at two research facilities, it shows how software controls the beamline when users select a new energy, protecting the sample from radiation damage during energy changes and optimization.
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.
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