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Instruments / Technical Area	Publication Details	Published	Actions
DIAD-Dual Imaging and Diffraction Beamline	Beamline K11 DIAD: a new instrument for dual imaging and diffraction at Diamond Light Source Christina Reinhard , Michael Drakopoulos , Sharif I. Ahmed , Hans Deyhle , Andrew James , Christopher M. Charlesworth , Martin Burt , John Sutter , Steven Alexander , Peter Garland , Thomas Yates , Russell Marshall , Ben Kemp , Edmund Warrick , Armando Pueyos , Ben Bradnick , Maurizio Nagni , A. Douglas Winter , Jacob Filik , Mark Basham , Nicola Wadeson , Oliver N. F. King , Navid Aslani , Andrew J. Dent Journal Of Synchrotron Radiation 28 DOI: 10.1107/S1600577521009875 Open Access Show Abstract ▼ Abstract: The Dual Imaging and Diffraction (DIAD) beamline at Diamond Light Source is a new dual-beam instrument for full-field imaging/tomography and powder diffraction. This instrument provides the user community with the capability to dynamically image 2D and 3D complex structures and perform phase identification and/or strain mapping using micro-diffraction. The aim is to enable in situ and in operando experiments that require spatially correlated results from both techniques, by providing measurements from the same specimen location quasi-simultaneously. Using an unusual optical layout, DIAD has two independent beams originating from one source that operate in the medium energy range (7–38 keV) and are combined at one sample position. Here, either radiography or tomography can be performed using monochromatic or pink beam, with a 1.4 mm × 1.2 mm field of view and a feature resolution of 1.2 µm. Micro-diffraction is possible with a variable beam size between 13 µm × 4 µm and 50 µm × 50 µm. One key functionality of the beamline is image-guided diffraction, a setup in which the micro-diffraction beam can be scanned over the complete area of the imaging field-of-view. This moving beam setup enables the collection of location-specific information about the phase composition and/or strains at any given position within the image/tomography field of view. The dual beam design allows fast switching between imaging and diffraction mode without the need of complicated and time-consuming mode switches. Real-time selection of areas of interest for diffraction measurements as well as the simultaneous collection of both imaging and diffraction data of (irreversible) in situ and in operando experiments are possible.	Nov 2021
I13-2-Diamond Manchester Imaging	A quantitative correction for phase wrapping artifacts in hard X-ray grating interferometry Griffin Rodgers , Georg Schulz , Hans Deyhle , Shashidhara Marathe , Christos Bikis , Timm Weitkamp , Bert Muller Applied Physics Letters 113 DOI: 10.1063/1.5045398 Diamond Proposal Number(s): [19829] Open Access Show Abstract ▼ Abstract: X-ray grating interferometry-based computed tomography is a phase contrast imaging technique that provides non-destructive, quantitative, and three-dimensional visualization with contrast superior to traditional absorption-based techniques, especially for materials primarily composed of low Z elements, such as biological tissues. However, it relies on measurements of the lateral shift of an interference pattern and is thus susceptible to so-called phase wrapping artifacts, which mainly occur at the sample-air interface. In this work, we present an algorithm for removal of such artifacts in the case of cylindrical samples and an experiment to verify its accuracy. The proposed algorithm is applied to the sinogram after phase retrieval and prior to reconstruction by finding sample edges with the absorption sinogram and replacing regions of the phase wrapped sinogram with modeled data. Our measurements show that the algorithm removes artifacts and produces more accurate δ values, as validated by measurements without phase wrapping. Our correction algorithm allows for measurements without submerging the sample in a water bath, simplifying the experimental setup and avoiding motion artifacts from gas bubbles.	Aug 2018

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