I13-1-Coherence
I18-Microfocus Spectroscopy
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Peter G.
Martin
,
Marion
Louvel
,
Silvia
Cipiccia
,
Christopher P.
Jones
,
Darren J.
Batey
,
Keith R.
Hallam
,
Ian A. X.
Yang
,
Yukihiko
Satou
,
Christoph
Rau
,
J. Fred W.
Mosselmans
,
David
Richards
,
Thomas B.
Scott
Diamond Proposal Number(s):
[16701, 16702, 18186]
Open Access
Abstract: Here we report the results of multiple analytical techniques on sub-mm particulate material derived from Unit 1 of the Fukushima Daiichi Nuclear Power Plant to provide a better understanding of the events that occurred and the environmental legacy. Through combined x-ray fluorescence and absorption contrast micro-focused x-ray tomography, entrapped U particulate are observed to exist around the exterior circumference of the highly porous Si-based particle. Further synchrotron radiation analysis of a number of these entrapped particles shows them to exist as UO2—identical to reactor fuel, with confirmation of their nuclear origin shown via mass spectrometry analysis. While unlikely to represent an environmental or health hazard, such assertions would likely change should break-up of the Si-containing bulk particle occur. However, more important to the long-term decommissioning of the reactors at the FDNPP (and environmental clean-upon), is the knowledge that core integrity of reactor Unit 1 was compromised with nuclear material existing outside of the reactors primary containment.
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Jun 2019
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A. E.
Hussein
,
N.
Senabulya
,
Y.
Ma
,
M. J. V.
Streeter
,
B.
Kettle
,
S. J. D.
Dann
,
F.
Albert
,
N.
Bourgeois
,
S.
Cipiccia
,
J. M.
Cole
,
O.
Finlay
,
E.
Gerstmayr
,
I. Gallardo
González
,
A.
Higginbotham
,
D. A.
Jaroszynski
,
K.
Falk
,
K.
Krushelnick
,
N.
Lemos
,
N. C.
Lopes
,
C.
Lumsdon
,
O.
Lundh
,
S. P. D.
Mangles
,
Z.
Najmudin
,
P. P.
Rajeev
,
C. M.
Schlepütz
,
M.
Shahzad
,
M.
Smid
,
R.
Spesyvtsev
,
D. R.
Symes
,
G.
Vieux
,
L.
Willingale
,
J. C.
Wood
,
A. J.
Shahani
,
A. G. R.
Thomas
Open Access
Abstract: Laser-wakefield accelerators (LWFAs) are high acceleration-gradient plasma-based particle accelerators capable of producing ultra-relativistic electron beams. Within the strong focusing fields of the wakefield, accelerated electrons undergo betatron oscillations, emitting a bright pulse of X-rays with a micrometer-scale source size that may be used for imaging applications. Non-destructive X-ray phase contrast imaging and tomography of heterogeneous materials can provide insight into their processing, structure, and performance. To demonstrate the imaging capability of X-rays from an LWFA we have examined an irregular eutectic in the aluminum-silicon (Al-Si) system. The lamellar spacing of the Al-Si eutectic microstructure is on the order of a few micrometers, thus requiring high spatial resolution. We present comparisons between the sharpness and spatial resolution in phase contrast images of this eutectic alloy obtained via X-ray phase contrast imaging at the Swiss Light Source (SLS) synchrotron and X-ray projection microscopy via an LWFA source. An upper bound on the resolving power of 2.7 ± 0.3 μm of the LWFA source in this experiment was measured. These results indicate that betatron X-rays from laser wakefield acceleration can provide an alternative to conventional synchrotron sources for high resolution imaging of eutectics and, more broadly, complex microstructures.
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Mar 2019
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I13-1-Coherence
I13-2-Diamond Manchester Imaging
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Abstract: The I13 imaging and coherence beamline aims for multiscale imaging in the energy range of 6-30keV. The achievable resolution ranges from several microns to tens of nanometers. Several experimental methods are available on two independently operating branchlines. The Diamond-Manchester imaging branchline applies methods in direct space, such as In-line phase contrast, grating interferometry and full-field microscopy. The coherence branch covers far-field techniques such as ptychography and Bragg-CDI. The ptychography is now available as user-friendly experiment and the spatial and temporal resolution has been significantly enhanced. The scientific program at I13 will increasingly explore the suite of experimental techniques available at the beamline for multi-scale imaging.
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Jan 2019
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I13-1-Coherence
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Open Access
Abstract: The Coherence branch of the I13 beamline in Diamond Light Source is specialized in reciprocal space imaging using Ptychography and Bragg CDT techniques. The experimental hutch is 220 m from the synchrotron source, providing the x-ray beam with intrinsic high spatial coherence. The capacious hutch allows variable sample-detector distance up to l4.5 m. This, in combination with the use of the large area photon counting detector Excalibur, enables fields of view as large as 500 μm, resolution down to tens of nanometers and acquisition rate in excess of l00 Hz. Recently the ptychography scan has been combined to the x-ray fluorescence scan to simultaneously access the chemical and structural information of the sample.
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Jan 2019
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I13-2-Diamond Manchester Imaging
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Diamond Proposal Number(s):
[19579]
Abstract: Hyperspectral X-ray detectors, which provide the full energy spectrum detected by each individual pixel, have become available for use in lab-based facilities. The addition of spectral information currently comes at the cost of low overall acceptable flux rates, and can introduce countrate nonlinearity at higher energies. Neither of these drawbacks are desirable for transmission imaging and tomography. In this paper a new data processing software chain is presented for the SLcam, a pnCCD-based hyperspectral camera prototype, allowing for more control over the conversion from raw frames to hyperspectral images. Complementary to the processing software, a set of live data visualisations was developed to aid in monitoring ongoing experiments and to allow for preliminary data processing on-the-fly. The combination of these software elements forms the first step towards general applicability of hyperspectral imaging at laboratory tomography setups.
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Nov 2018
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I13-1-Coherence
Metrology
Optics
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J.
Krempasky
,
U.
Flechsig
,
P.
Vagovic
,
C.
David
,
F.
Koch
,
A.
Jaggi
,
C.
Svetina
,
Shashidhara
Marathe
,
D.
Batey
,
S.
Cipiccia
,
C.
Rau
,
F.
Seiboth
,
M.
Seaberg
,
U. H.
Wagner
,
L.
Patthey
,
L.
Mikes
Diamond Proposal Number(s):
[19521]
Abstract: Preserving the coherence and wavefront of a diffraction limited x-ray beam from the source to the experiment poses stringent quality requirements on the production processes for X-ray optics. In the near future this will require on-line and in-situ at-wavelength metrology for both, free electron lasers and diffraction limited storage rings. A compact and easy to move X-ray grating interferometry (XGI) setup has been implemented by the Beamline Optics Group at PSI in order to characterize x-ray optical components by determining the aberrations from reconstructing the x-ray wavefront. The XGI setup was configured for measurements in the moire mode and tested with focusing optic at Swiss Light Source, Diamond Light Source and LCLS. In this paper measurements on a bendable toroidal mirror, a zone plate, a single and a stack of beryllium compound refractive lenses (CRL) are presented. From these measurements the focal position and quality of the beam spot in terms of wavefront distortions are determined by analysing the phase-signal obtained from the XGI measurement. In addition, using a bendable toroidal mirror, we directly compare radius of curvature measurements obtained from XGI data with data from a long-trace profilometer, and compare the CRL wavefront distortions with data obtained by ptychography.
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Sep 2018
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I13-2-Diamond Manchester Imaging
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Diamond Proposal Number(s):
[19579]
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Aug 2018
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I13-2-Diamond Manchester Imaging
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Diamond Proposal Number(s):
[19579]
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Aug 2018
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I13-2-Diamond Manchester Imaging
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Diamond Proposal Number(s):
[14080]
Abstract: The use of synchrotron radiation micro-computed tomography (SR-microCT) is becoming increasingly popular for studying the relationship between microstructure and bone mechanics subjected to in situ mechanical testing. However, it is well known that the effect of SR X-ray radiation can considerably alter the mechanical properties of bone tissue. Digital volume correlation (DVC) has been extensively used to compute full-field strain distributions in bone specimens subjected to step-wise mechanical loading, but tissue damage from sequential SR-microCT scans has not been previously addressed. Therefore, the aim of this study is to examine the influence of SR irradiation-induced microdamage on the apparent elastic properties of trabecular bone using DVC applied to in situ SR-microCT tomograms obtained with different exposure times. Results showed how DVC was able to identify high local strain levels (>10,000 µε) corresponding to visible microcracks at high irradiation doses (~230 kGy), despite the apparent elastic properties remained unaltered. Microcracks were not detected and bone plasticity was preserved for low irradiation doses (~33 kGy), although image quality and consequently, DVC performance were reduced. DVC results suggested some local deterioration of tissue that might have resulted from mechanical strain concentration further enhanced by some level of local irradiation even for low accumulated dose.
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Aug 2018
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I13-1-Coherence
I13-2-Diamond Manchester Imaging
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Christoph
Rau
,
Malte
Storm
,
Shashidhara
Marathe
,
Andrew J.
Bodey
,
Silvia
Cipiccia
,
Darren
Batey
,
Xiaowen
Shi
,
Marie-christine
Zdora
,
Irene
Zanette
,
Saul
Perez-tamarit
,
Paula
Cimavilla
,
Miguel A.
Rodriguez-perez
,
Florian
Doring
,
Christian
David
Abstract: The Diamond I13 imaging and coherence beamline performs multiscale imaging and tomography with phase sensitive imaging methods. Operating in the energy range of 6-30keV, the achievable resolution ranges from several microns to tens of nanometers. The beamline is unique in combining imaging methods in real and reciprocal spaces, which are available on two independently operating branchlines. The scientific program is currently being developed with the distinct capabilities offered by the beamline. Most recently ptycho-tomography has become operational and a multitude of scientific projects is linking the research between both branchlines.
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Aug 2018
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