A5074663627- Particle Detector Development and Performance
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced X-ray Imaging Techniques
- Radiation Detection and Scintillator Technologies
- Nuclear Physics and Applications
- Crystallography and Radiation Phenomena
- Advanced X-ray and CT Imaging
- Electron and X-Ray Spectroscopy Techniques
- CCD and CMOS Imaging Sensors
- Medical Imaging Techniques and Applications
- Particle Accelerators and Free-Electron Lasers
- Advanced Electron Microscopy Techniques and Applications
- X-ray Diffraction in Crystallography
- Laser-Matter Interactions and Applications
- Semiconductor materials and devices
- Enzyme Structure and Function
- Dark Matter and Cosmic Phenomena
- High-pressure geophysics and materials
- Atomic and Subatomic Physics Research
- Advanced NMR Techniques and Applications
- Advancements in Semiconductor Devices and Circuit Design
- Advanced Semiconductor Detectors and Materials
- Laser-Plasma Interactions and Diagnostics
- Ion-surface interactions and analysis
- Radiation Effects in Electronics
Brookhaven National Laboratory
2013-2024
National Synchrotron Light Source II
1991-2024
RIKEN BNL Research Center
2014
Australian Synchrotron
2010
Commonwealth Scientific and Industrial Research Organisation
2010
ALBA Synchrotron (Spain)
2010
CSIRO Manufacturing
2010
The University of Melbourne
2010
La Trobe University
2010
University of Tasmania
2010
A novel method to measure x-ray-absorption spectra without the inner-shell lifetime broadening is presented. It based on a high-resolution spectrometer which can be used analyze fluorescence photon energy with better resolution than natural linewidth. The dramatic improvement in and detailed structure for near-edge (XANES) at Dy ${\mathit{L}}_{\mathrm{III}}$ edge This new technique reveals totally invisible using conventional XANES.
Motivated by the challenge of capturing complex hierarchical chemical detail in natural material from a wide range applications, Maia detector array and integrated realtime processor have been developed to acquire X-ray fluorescence images using Fluorescence Microscopy (XFM).Maia has deployed initially at XFM beamline Australian Synchrotron more recently, demonstrating improvements energy resolution, P06 Petra III Germany.Maia captures fine element beyond 100 M pixels.It combines large...
Delayed coherent nuclear forward scattering of synchrotron radiation by polycrystalline Fe foils (both isotopically enriched and naturally abundant) has been measured. Quantum beats wre observed in the time spectra. With chosen experimental conditions these can only arise from scattering. The 5-meV bandwidth provided a special silicon crystal monochromator obviates need for resonant filter. This direct approach offers possibility performing wide range M\"ossbauer spectroscopy experiments...
The Maia detector system is engineered for energy dispersive x‐ray fluorescence spectroscopy and elemental imaging at photon rates exceeding 107/s, integrated scanning of samples pixel transit times as small 50μs high definition images 108 pixels real‐time processing detected events spectral deconvolution online display pure images. developed by CSIRO BNL combines a planar silicon 384 array, application‐specific circuits pulse shaping peak detection sampling optical data transmission to an...
The coherent nuclear reemission in the forward direction has been measured following excitation of M\"ossbauer transitions polycrystalline $^{57}\mathrm{Fe}$ foils by synchrotron radiation. excited resonances are sufficiently narrow energy that time dependence their decay can be straightforwardly observed, and particular details collective response to single-photon studied. scattering conditions were varied directly over a large range using foil thicknesses between 0.5 28.5...
A method to measure spin-dependent x-ray-absorption spectra that does not require long-range magnetic order is presented. It based on the spin dependence of emission spectrum. Using a high-resolution spectrometer separate and select different spin-polarized final states in K\ensuremath{\beta} fluorescence spectrum MnO ${\mathrm{MnF}}_{2}$, absorption vicinity Mn K edge were measured. Since this uses direction local moment as reference it can be applied paramagnetic antiferromagnetic systems...
Motivated by the need for megapixel high definition trace element imaging to capture intricate detail in natural material, together with faster acquisition and improved counting statistics elemental imaging, a large energy‐dispersive detector array called Maia has been developed CSIRO BNL SXRF on XFM beamline at Australian Synchrotron. A 96 prototype demonstrated capacity of system real‐time deconvolution complex spectral data using an embedded implementation Dynamic Analysis method...
Maia is an advanced system designed specifically for scanning x-ray fluorescence microprobe applications. It consists of a large array photodiode detectors and associated signal processing, closely coupled to FPGA-based control analysis system. In this paper we will describe the architecture construction
A free relativistic electron in an electromagnetic field is a pure case of light-matter interaction. In the laboratory environment, this interaction can be realized by colliding laser pulses with beams produced from particle accelerators. The process single photon absorption and reemission electron, so-called linear Thomson scattering, results radiation that Doppler shifted into x-ray gamma-ray regions. At elevated intensity, nonlinear effects should come play when transverse motion...
Nuclear Bragg scattering of synchrotron radiation from isotopically enriched $^{57}\mathrm{Fe}_{2}$${\mathrm{O}}_{3}$ has been observed at a signal-to-noise ratio 100:1 without delayed-coincidence techniques. The use high-resolution premonochromator providing 5-meV energy spread and 0.4'' collimation allows for studies dynamical diffraction effects. In particular, the intensity pure nuclear (7,7,7) reflection implies dramatic decrease effective lifetime due to coherent scattering.
Over the past several decades oeuvre of Rembrandt has been subject extensive art historical and scientific investigations. One most striking features to emerge is his frequent re-use canvases panels. The painting An Old Man in Military Costume (78.PB.246), collection J. Paul Getty Museum, an example such a re-used panel. Conventional imaging techniques revealed presence second portrait under surface portrait, but details this hidden have not yet revealed. Vermilion (HgS) identified used...
Femtosecond time-resolved small and wide angle x-ray diffuse scattering techniques are applied to investigate the ultrafast nucleation processes that occur during ablation process in semiconducting materials. Following intense optical excitation, a transient liquid state of high compressibility characterized by large-amplitude density fluctuations is observed buildup these measured real time. Small-angle measurements reveal snapshots spontaneous nanoscale voids within metastable support...
Synchrotron X-ray fluorescence (SXRF) and absorption spectroscopy (XAS) have become standard tools to measure element concentration, distribution at micrometer- nanometer-scale, speciation (e.g., nature of host phase; oxidation state) in inhomogeneous geomaterials. The new Maia detector system provides a quantum leap for the method terms data acquisition rate. It is now possible rapidly collect fully quantitative maps major trace elements micrometer spatial resolution over areas as large 1 ×...
Maia Mapper is a laboratory μXRF mapping system for efficient elemental imaging of drill core sections serving minerals research and industrial applications. It targets intermediate spatial scales, with up to ∼80 M pixels over 500×150 mm2 sample area. brings together (i) the detector system, its large solid-angle, event-mode operation, millisecond pixel transit times in fly-scan mode real-time spectral deconvolution imaging, (ii) high brightness MetalJet D2 liquid metal micro-focus X-ray...
A decade ago, prototypes of the Maia detector successfully demonstrated a fresh approach to X-ray fluorescence microscopy (XFM) imaging that combined massively parallel architecture with dedicated pulse shaping and capture on each channel, asynchronous acquisition X-rays as an event stream, real-time processing data [1, 2]. Today, number XFM beamlines raster scan sample through focused beam construct images element concentration chemical state use 384-detector array version for...
A high-resolution fluorescence spectrometer using a Johann geometry in backscattering arrangement was developed. The spectrometer, with resolution of 0.3 eV at 6.5 keV, combined an incident beam, 0.7 eV, form the basis instrument for measuring x-ray absorption spectra. advantages are illustrated near-edge spectrum dysprosium nitrate.
A scanning X-ray interferometer system [Hart & Siddons (1981). Proc. R. Soc. London Ser. A, 376, 465-482] has been rebuilt for operation at the SERC Daresbury Synchrotron Radiation Source (SRS). The SRS permits an increase in energy resolution by one decade and simultaneously intensity gain of thousand times, though practice solid-state detector employed limited peak utilized so that experiments which hitherto demanded month counting time are now performed higher spectral 2-4 h. Absolute...
Thomson scattering of high-power laser and electron beams is a good test electrodynamics in the high-field region. We demonstrated production high-intensity X-rays head-on collision CO2 60-MeV at Brookhaven National Laboratory, Accelerator Test Facility. The energy an X-ray photon was limited 6.5 keV linear (lowest order) scattering, but nonlinear (higher process produces higher X-rays. measured angular distribution high-energy confirmed that it agrees with theoretical predictions.
A new detector for EXAFS experiments is being developed. It based on a multi-element Si sensor and dedicated readout application specific integrated circuit (ASIC). The composed of 384 pixels, each having 1 mm/sup 2/ area, arranged in four quadrants 12/spl times/8 elements it wire-bonded to 32-channel ASICs. Each channel implements low-noise preamplification with self-adaptive continuous reset, high-order shaper, bandgap referenced baseline stabilizer, one threshold comparator, two...
The full time evolution of the coherent deexcitation 14.4-keV nuclear resonance, excited by synchrotron radiation in a single crystal simple antiferromagnet $^{57}\mathrm{Fe}_{2}$${\mathrm{O}}_{3}$, has been measured. buildup from zero decay probability at following excitation, increasing to maximum 2.4 nseclater, observed experimentally for first time. results are good agreement with calculations based on dynamical theory Bragg scattering.