Development of synchrotron pink beam x-ray grating interferometer at the Diamond Light source I13-2 beamline

Abstract

X-ray Grating Talbot Interferometer (XGTI) is already routinely used for quantitative phase contrast imaging of soft tissue samples. XGTI can be realized using various measurement techniques, depending on the X-ray source used, the required spatial resolution and the speed of acquisition. The phase-stepping measurement technique, which is commonly used for XGTI data acquisition, needs multiple acquisitions for a single projection. For fast imaging the Moiré technique, a single-shot technique, is often preferred. However, it requires two gratings which increases the dose on the sample. We have therefore examined the Spatial Harmonic Imaging (SHI) technique which is low-dose and single-shot, using the I13-2 Diamond-Manchester Beamline at Diamond Light Source (DLS). The DLS I13-2 beamline is equipped with a Double Crystal Monochromator (DCM) and a Multi-Layer Monochromator (MLM) to deliver monochromatic beam, which work at the energy bandwidths (ΔE/E) of 10 -4 and 10 -2 , respectively. However, the disadvantage of using these monochromators, especially for fast imaging, is loss of X-ray flux. It has already been shown that XGTI can work with an energy bandwidth (ΔE/E) of 10 -1 . Our aim is to develop a single phase grating interferometer with pink beam from an undulator source, with X-ray mirror optics and multiple absorption filters, to obtain maximum possible flux with sufficient coherence and monochromaticity. We demonstrate performance with optimized beamline parameters for a photon energy of 15 keV with some demonstrative image reconstructions.

In Situ Characterization of Three‐Phase Flow in Mixed‐Wet Porous Media Using Synchrotron Imaging

“…High‐intensity X‐rays were collected from the accelerator machine of the Diamond Light Source and brought to the beamline. Here, three filters (1.3 mm Pyrolytic C, 3.2 mm Al, and 10 μm Au) trimmed the wavelength of the X‐rays to obtain a high‐intensity pink beam (Marathe et al, 2019). The resulting X‐ray spectrum has a thin peak at 15 keV, corresponding to a flux of 9 × 10 12 photons per second (Rau et al, 2019).…”

High-throughput micro and nano-tomography

“…The use of the so-called 'pink beam' or alternatively multilayer increases the photon flux by up to two orders of magnitude, compared to when using a Si(111) monochromator. We investigated the impact of the broadband illumination on the image quality for the different techniques (in-line phase contrast, grating interferometry, full-field microscopy) used on the imaging branchline in particular [9][10][11] .…”

Fast Multi-scale imaging using the Beamline I13L at the Diamond Light Source

“…The requirements regarding the energy bandwidth for grating interferometry are moderate and the influence has been tested [20] using the energy spectrum as shown in figure 1. The resulting exposure times are about 5 ms and, with a single grating geometry, time-resolved data can be recorded without any additional scanning.…”

“…Figure 3 shows a first result from a study of anti-solvent crystallization studies of lovastatin (in water acetone solution) with anti-solvent of water. The mixing zone is in the centre of the image, details about the geometry of the experimental setup can be found elsewhere [20]. The image series of the dark-field and also of the phase shift channel reveal the moment preceding the crystallization in a specific zone.…”