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Novel numerical method for calculating the shadow projection and collisions of a multi-axis goniometer at diamond

DOI: 10.18429/JACoW-MEDSI2016-WEAA04 DOI Help

Authors: V. Grama (Diamond Light Source) , A. Wagner (Diamond Light Source)
Co-authored by industrial partner: No

Type: Conference Paper
Conference: MEDSI2016
Peer Reviewed: No

State: Published (Approved)
Published: June 2017

Abstract: Beamline I23 is a long-wavelength macromolecular crystallography beamline at Diamond Light Source. The end station is a unique instrument with a bespoke cryogenically cooled multi-axis goniometer and a large curved Pilatus 12M detector in a high vacuum environment. As experiments become limited by radiation damage to the crystals, optimised strategies are needed to orient crystals in the most efficient way to obtain a complete dataset with a minimal X-ray dose. Two key factors affect the optimisation strategies. Firstly, shadowing on the detector by the goniometer resulting in data loss in this region and secondly, collisions between the goniometer and other components in the end station restricting the available angular range for sample centering and data collection. This paper discusses the numerical methods for calculating the shadowing of a multi-axis goniometer on a semicylindrical detector and the calculation of the allowable angles for various conditions to prevent collisions with neighbouring components.

Journal Keywords: ion; detector; vacuum; factory; alignment

Subject Areas: Technique Development

Technical Areas: Detectors

Added On: 12/07/2017 14:12

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