A5067952484- Particle Detector Development and Performance
- Advanced X-ray and CT Imaging
- CCD and CMOS Imaging Sensors
- Radiation Detection and Scintillator Technologies
- Advanced X-ray Imaging Techniques
- Medical Imaging Techniques and Applications
- Nuclear Physics and Applications
- Advanced Semiconductor Detectors and Materials
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced Electron Microscopy Techniques and Applications
- Laser-Plasma Interactions and Diagnostics
- Integrated Circuits and Semiconductor Failure Analysis
- X-ray Diffraction in Crystallography
- Rheology and Fluid Dynamics Studies
- Machine Learning in Materials Science
- Geological and Geochemical Analysis
- Enzyme Structure and Function
- Semiconductor materials and devices
- High-pressure geophysics and materials
- Radiation Dose and Imaging
- Electrical and Bioimpedance Tomography
- Digital Radiography and Breast Imaging
- Mass Spectrometry Techniques and Applications
- Mineral Processing and Grinding
- 3D IC and TSV technologies
Deutsches Elektronen-Synchrotron DESY
2014-2024
Center for Free-Electron Laser Science
2015-2024
Universität Hamburg
2015-2024
Hamburg Institut (Germany)
2011-2014
University of Glasgow
2006-2011
Semiconductor detector readout chips with pulse processing electronics have made possible spectroscopic X-ray imaging, bringing an improvement in the overall image quality and, case of medical a reduction dose delivered to patient. In this contribution we review state art semiconductor-detector ASICs for imaging emphasis on hybrid pixel technology. We discuss how some key challenges technology (such as dealing high fluxes, maintaining spectral fidelity, power consumption density) are...
Multilayer Laue lenses are volume diffraction elements for the efficient focusing of X-rays. With a new manufacturing technique that we introduced, it is possible to fabricate sufficiently high numerical aperture (NA) achieve focal spot sizes below 10 nm. The alternating layers materials form lens must span broad range thicknesses on nanometer scale necessary X-ray deflection angles required NA. This poses challenge both accuracy deposition process and control properties, which often vary...
Abstract The ever-increasing brightness of synchrotron radiation sources demands improved X-ray optics to utilise their capability for imaging and probing biological cells, nanodevices functional matter on the nanometer scale with chemical sensitivity. Here we demonstrate focusing a hard beam an 8 nm focus using volume zone plate (also referred as wedged multilayer Laue lens). This lens was constructed new deposition technique that enabled independent control angle thickness diffracting...
X-ray imaging is a widely used modality in the medical diagnostic field due to its availability, low cost, high spatial resolution, and fast image acquisition. photons standard sources are polychromatic. Detectors that allow extract "color" information of individual X-rays can lead contrast enhancement, improved material identification or reduction beam hardening artifacts at system level, if we compare them with spread energy integrating detectors. Today, computed tomography (CT),...
Fast compression experiments performed using dynamic diamond anvil cells (dDACs) employing piezoactuators offer the opportunity to study compression-rate dependent phenomena. In this paper, we describe an experimental setup which allows us perform time-resolved x-ray diffraction during fast of materials improved dDACs. The combination high flux available a 25.6 keV beam focused with linear array compound refractive lenses and two GaAs LAMBDA detectors at Extreme Conditions Beamline (P02.2)...
Serial crystallography experiments produce massive amounts of experimental data. Yet in spite these large-scale data sets, only a small percentage the are useful for downstream analysis. Thus, it is essential to differentiate reliably between acceptable (hits) and unacceptable (misses). To this end, novel pipeline proposed categorize data, which extracts features from images, summarizes with `bag visual words' method then classifies images using machine learning. In addition, study various...
The Medipix3 photon-counting detector chip has a number of novel features that are attractive for synchrotron experiments, such as high frame rate with zero dead time and spatial resolution. DESY developing large-area Medipix3-based array (LAMBDA). A single LAMBDA module consists 2 by 6 chips on ceramic carrier board, bonded to either large silicon sensor or two smaller high-Z sensors. readout system fits behind the board allow tiling, uses on-board RAM multiple 10 Gigabit Ethernet links...
Synchrotrons can provide very intense and focused X-ray beams, which be used to study the structure of matter down atomic scale. In many experiments, quality results depends strongly on detector performance; in particular, experiments studying dynamics samples require fast, sensitive detectors. "LAMBDA" is a photon-counting hybrid pixel system for at synchrotrons, based Medipix3 readout chip. Its main features are combination comparatively small size (55 μm), high speed up 2000 frames per...
Abstract We experimentally determined the bulk modulus of (Mg 0.8 Fe 0.2 )O ferropericlase across iron spin transition and in low‐spin phase by employing a new experimental approach. In our measurements, we simulate propagation compressional seismic wave (P wave) through sample piezo‐driven dynamic diamond anvil cell that allows to oscillate pressure at frequencies. During oscillations, X‐ray diffraction images were continuously collected every 5–50 ms. The is directly calculated from these...
The ARIADNE project is developing innovative optical readout technologies for two-phase liquid Argon time projection chambers (LArTPCs). Optical presents an exciting alternative to the current paradigm of charge readout. simple, scalable and cost effective. This paper first demonstration 3D TPC, using CF4 gas as a proof principle. Both cosmic rays Americium-241 alpha source have been imaged in 100 mbar CF4. A single-photon sensitive camera was developed by combining Timepix3 (TPX3) based...
For the planned luminosity upgrade of CERN LHC to sLHC new radiation hard technologies for tracking detectors are investigated. Corresponding increase, dose will be approximately a factor ten higher than currently installed in experiments. One option tolerant 3D silicon with columnar electrodes penetrating into bulk. This article reports results beam test measurements performed 3D-DDTC (Double-Sided, Double Type Column) strip detectors, where columns do not pass through detector completely....
Many X-ray experiments at third-generation synchrotrons benefit from using single-photon-counting detectors, due to their high signal-to-noise ratio and potential for high-speed measurements. LAMBDA (Large Area Medipix3-Based Detector Array) is a pixel detector system based on the Medipix3 readout chip. It combines features of Medipix3, such as small size 55 μm flexible functionality, with large tileable module design consisting 12 chips (1536 × 512 pixels) capable running 2000 frames per second.
Hybrid pixel semiconductor detectors provide high performance through a combination of direct detection, relatively small size, fast readout and sophisticated signal processing circuitry in each pixel. For X-ray detection above 20 keV, high-Z sensor layers rather than silicon are needed to achieve quantum efficiency, but many materials such as GaAs CdTe often suffer from poor material properties or nonuniformities. Germanium is available large wafers extremely quality, making it an appealing...
Structural distortion and relaxation are central to any liquid flow. Their full understanding requires simultaneous probing of the mechanical as well structural dynamical response. We provide first measurement transient structure using combined coherent X-ray scattering rheology on electrostatically interacting colloidal fluids. find a stress overshoot during start-up shear which is due strong anisotropic overstretching compression nearest-neighbor distances. The rheological response...
We demonstrate the application of event-driven Timepix3-based detectors in combination with a double-sided velocity-map-imaging spectrometer to record full 3D momentum charged particles at free-electron-laser facility FLASH. measured XUV induced fragmentation $\text{N}_2$ using 250 kHz FLASH bursts sub-pixel spatial resolution and up 1.7~ns temporal for photoelectrons. To further capabilities this camera even higher repetition rates we single-shot images He($1s$) photoelectrons rate 1 MHz....
The Medipix3 hybrid pixel readout chip incorporates "charge summing" circuitry, which sums together signals detected in adjacent pixels to reconstruct individual hits. This should compensate for fluorescence and charge sharing effects degrade the performance of high-Z semiconductor detectors such as germanium, gallium arsenide cadmium telluride. behaviour different sensors read out by is simulated, compare their test effectiveness a proposed new inter-pixel communication scheme. are...
The Medipix3 photon counting readout chip has a range of features — small pixel size, high rate and inter-pixel communication which make it attractive for X-ray scattering imaging at synchrotrons. DESY have produced prototype large-area detector module that can carry 6 by 2 array chips (1536 512 pixels), be used with single large silicon sensor (85mm 28mm) or two ``hexa'' high-Z sensors. head is designed to tilable compatible low temperatures, will allow speed parallel the chips. It consists...
Medipix3 is a photon-counting readout chip for X-ray detection. It has small pixel size (55 μm) and high frame rate with zero dead time, which makes it attractive experiments at synchrotrons. Using Medipix3, DESY are developing the LAMBDA (Large Area Medipix3-Based Detector Array) system. A single module carries either large silicon sensor of 1536 by 512 pixels, or two smaller high-Z sensors. The bonded to 12 chips, mounted on ceramic carrier board. system then provides fast FPGA, RAM four...
A new ldquodouble sidedrdquo 3-D solid-state detector structure, intended to simplify the fabrication process, is proposed. In this electrode columns of different doping types are etched from opposite sides substrate, with neither set passing through full substrate thickness. The finite-element simulation package ISE-TCAD used determine performance structure. double-sided shows similar electrostatic behavior a standard detector, giving low depletion voltage and fast charge collection....
Grating-based differential phase-contrast imaging has proven to be feasible with conventional X-ray sources. The polychromatic spectrum generally limits the performance of interferometer but benefit can gained an energy-sensitive detector. In presented work, we employ energy-discrimination capability correct for phase-wrapping artefacts. We propose use phase shifts, which are measured in distinct energy bins, estimate optimal shift sense maximum likelihood. demonstrate that our method is...
Suitable detection systems that are capable of recording high photon count rates with single-photon instrumental for coherent X-ray imaging. The new single-photon-counting pixel detector `Lambda' has been tested in a ptychographic imaging experiment on solar-cell nanowires using Kirkpatrick–Baez-focused 13.8 keV X-rays. Taking advantage the rate Lambda and dynamic range expansion by semi-transparent central stop, high-dynamic-range diffraction signal covering more than seven orders magnitude...