A5035403395- Advanced X-ray Imaging Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Crystallography and Radiation Phenomena
- Advanced X-ray and CT Imaging
- Advanced Electron Microscopy Techniques and Applications
- Advanced Surface Polishing Techniques
- Medical Imaging Techniques and Applications
- Laser-Plasma Interactions and Diagnostics
- Electron and X-Ray Spectroscopy Techniques
- Spacecraft Design and Technology
- Particle Detector Development and Performance
- Innovative concrete reinforcement materials
- Advancements in Photolithography Techniques
- Enzyme Structure and Function
- Optical Coatings and Gratings
- Nuclear Physics and Applications
- Granular flow and fluidized beds
- Grouting, Rheology, and Soil Mechanics
- Magnesium Oxide Properties and Applications
- Thin-Film Transistor Technologies
- Advanced Semiconductor Detectors and Materials
- Innovations in Concrete and Construction Materials
- Planetary Science and Exploration
- Photocathodes and Microchannel Plates
- Gamma-ray bursts and supernovae
Czech Academy of Sciences, Institute of Physics
2013-2024
Rigaku Innovative Technologies Europe (Czechia)
2012-2023
Czech Academy of Sciences
2012-2023
Paul Scherrer Institute
2009-2016
Swiss Light Source
2009-2012
Masaryk University
2010
University of Copenhagen
2010
Czech Academy of Sciences, Institute of Plasma Physics
2008
National Synchrotron Radiation Research Center
2008
The Photo-Emission and Atomic Resolution Laboratory (PEARL) is a new soft X-ray beamline surface science laboratory at the Swiss Light Source. PEARL dedicated to structural characterization of local bonding geometry surfaces interfaces novel materials, in particular molecular adsorbates, nanostructured surfaces, complex materials. main experimental techniques are photoelectron spectroscopy, diffraction, scanning tunneling microscopy (STM). Photoelectron diffraction angle-scanned mode...
We briefly present selected results in the field of X-ray optics obtained within project at CTU Prague collaboration with other Czech Institutes, mainly Rigaku Prague, where modules were assembled. These efforts covered simulations and designs LE (Lobster Eye) KB (Kirkpatrick-Baez) optical Systems, a study new alternative simulation/ray tracing methods, studies alternative/improved coatings, improved substrates (Si float glass), design assembly test both based on Multi Foil Technology (glass...
HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not.The documents may come from teaching institutions in France abroad, public private centers.L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de scientifiques niveau recherche, publiés ou non, émanant des établissements d'enseignement recherche français étrangers, laboratoires publics privés. Hard x-ray...
The characterisation of fast phenomena at the microscopic scale is required for understanding catastrophic responses materials to loads and shocks, processing by optical or mechanical means, processes involved in many key technologies such as additive manufacturing microfluidics, mixing fuels combustion. Such are usually stochastic nature occur within opaque interior volumes samples, with complex dynamics that evolve all three dimensions speeds exceeding meters per second. There therefore a...
The performance of a recently developed full-field X-ray micro-imaging system based on an in-line Bragg magnifier is reported. composed quasi-channel-cut crystals in combination with Medipix single-photon-counting detector. A theoretical and experimental study the imaging crystals-detector comparison standard indirect detector typically used high-resolution schemes are spatial resolution attained by our about 0.75 µm, limited only current magnification. Compared system, this features better...
The X-ray optics group at the Swiss Light Source in co-operation with RIT (Rigaku Innovative Technologies) have investigated seven different multilayer samples. goal was to find an ideal structure for energy range between 6 keV and 20 terms of resolution reflectivity. Such structures deposited on substrates can be used as monochromators or reflecting synchrotron mirrors. measured reflectivities agree simulated ones. They cover a reflectivity from 45% 80% energies 10 keV, 90% keV....
The planned XFEL at the Paul Scherrer Institut, SwissFEL, is a fourth generation light source. Meanwhile first hard X - ray FEL was taken into operation, LCLS Stanford, USA. Two further XFELs are in construction. One Hamburg, Germany and second Spring 8, Japan. Thanks to beam properties of XFEL, these new sources promise bring novel insights breakthroughs many scientific disciplines. For engineers designers challenges arise terms material choice, damage thresholds property conservation....
A reliable measurement of beam coherence is important for optimal performance a number methods being utilized at third-generation synchrotrons and free-electron lasers.Various approaches have been proposed in the past determining source size, hence degree coherence; however they often require complex setups with perfect optics suffer from undefined uncertainties.We present robust tool X-ray characterization full quantitative uncertainty analysis fast on-the-fly measurements.The influence...
We present a miniaturized and wide field-of-view X-ray Gamma-ray imager consisting of segmented 2D optics-collimator coupled to the high-sensitivity semiconductor pixel detector Timepix equipped with high-Z sensor (CdTe 2000 μm thick). The compact payload has been deployed in low-Earth orbit (LEO) onboard 3U Cubesat VZLUSAT-2 which was launched on 13 January 2022. instrument is designed verify small spacecraft borne observation open space hard sources both celestial atmospheric origin....
It is shown theoretically that the asymmetric or inclined double-crystal X-ray monochromator may be used for pulse compression if properly chirped. By adjusting mutual distance of two crystals it should possible to achieve even a sub-femtosecond chirped free-electron laser pulse. The small d-spacing crystal enables more compact scheme compared with currently grating scheme. cut acceptance larger bandwidth. has tunability.
A new kind of two channel-cut crystals X-ray monochromator in dispersive (+,-,-,+) position which spatially separates harmonics is proposed. The diffracting surfaces are oriented so that the diffraction inclined. Owing to refraction diffracted beam sagittally deviated. deviation depends on wavelength and much higher for first than harmonics. This leads spatial separation. idea supported by ray-tracing simulation.
Dual-energy or K-edge imaging is used to enhance contrast between two more materials in an object and routinely realised by acquiring separate X-ray images each at different wavelength. On a broadband synchrotron source system acquire the simultaneously was realised. The single-shot approach allows dual-energy stereo be applied dynamic systems. Using Laue-Bragg crystal splitting scheme, beam split into branches could easily tuned either same wavelengths. Due crystals' mutual position,...
Misalignment of the rotation axis causes severe artifacts in X-ray computed tomography. Calibration this parameter is often insufficient for sub-micron resolution measurements and needs to be corrected during post-processing. This correction can accelerated by various automatic methods. These vary mechanisms performance, making them suitable different use-cases. work summarizes existing methods estimating tomography, with a focus on applications. Some are implemented compared context...
Diffractive-refractive optics are x-ray focusing monochromators based on the diffraction profiled crystal surface. Diffraction longitudinal parabolic groove machined in surface forms a sagittaly focused synchrotron radiation beam. Such kind of monochromator may be realized as with hole, where beam is diffracted inner wall hole. Two such asymmetrically cut crystals set into antiparallel position, creating dispersive (+,−,−,+) arrangement, form which should practically aberration-free. The...
A proof-of-principle experiment of a novel harmonics separation optics for synchrotron facilities is presented. The harmonic separator Si crystal cut in an inclined geometry which the impinging beam undergoes diffractive-refractive effect owing to dispersive nature X-ray refraction. polychromatic containing higher-order energies spatially separated behind into individual monochromatic diffraction spots. at bending-magnet beamline with 7 keV fundamental energy spot third-order 21 deviated...
Based on analytical formulae calculations and ray-tracing simulations a low-aberration focal spot with high demagnification ratio was predicted for diffractive–refractive crystal optics device parabolic surfaces. Two Si(111) crystals two precise parabolic-shaped grooves have been prepared arranged in dispersive position (+,−,−,+) asymmetry. Experimental testing of the at beamline BM05 ESRF provided size 38.25 µm distance 1.4 m 7.31 keV. This is first experiment groove; all previous...
The possibility of sagittally focusing synchrotron radiation using an asymmetric Laue crystal with profiled surfaces has been experimentally demonstrated for the first time. sample was a Si single two parallel cylindrical holes diameter 8 mm. axes formed angle 7.95° (111) diffracting planes and were arranged vertically respect to planes. 15.35 keV diffracted in space between holes. minimum thickness this 0.5 beam 0.55° exit surface. experiment performed at beamline BM05 ESRF. length not...
We present a X‐ray training course for students. The covers fundamental properties of synchrotron radiation and basic techniques like scattering absorption. prepared ten experiments together with tutorial. whole takes about week. A first student group from the University Copenhagen passed in June 2009. were performed at optics beamline Swiss Light Source which can be part‐time allocated purposes. Two are described more detail: hanging drop water turning into ice measurement power pink beam...
A simple variant of a Si internally cooled inclined X-ray monochromator reasonable size is proposed. It has two surfaces oriented into V shape. This design substantially decreases the surface deformations introduced by radiation heat, and crystal still feasible for 50 mm broad impinging bending magnet or wiggler beam. The possibility sagittal focusing diffracted beam also discussed.
Two crystals with precise parabolic holes were used to demonstrate sagittal beam collimation by means of a diffractive-refractive double-crystal monochromator. A new approach is introduced and demonstrated. Si(333) an asymmetry angle α = 15° prepared arranged in dispersive position (+,-,-,+). Based on theoretical calculations, this set-up should provide tunable within energy range 6.3-18.8 keV (Θ(B) 71-18.4°). An experiment study was performed BM05 at ESRF. Using 8.97 energy, the profile...