Photon counting type imaging spectrometer for solar soft x-rays (Conference Presentation)

2017 ◽  
Author(s):  
Noriyuki Narukage ◽  
Shin-nosuke Ishikawa ◽  
Tomoko Kawate ◽  
Taro Sakao ◽  
Lindsay Glesener ◽  
...  
Keyword(s):  
Photon Counting ◽  
X Rays ◽  
Imaging Spectrometer

scholarly journals Measurement of synchrotron-radiation-excited Kossel patterns

2016 ◽  
Vol 23 (1) ◽  
pp. 214-218 ◽  
Author(s):  
G. Bortel ◽  
G. Faigel ◽  
M. Tegze ◽  
A. Chumakov
Keyword(s):  
High Resolution ◽  
Dynamic Range ◽  
Structural Information ◽  
Photon Counting ◽  
Spot Size ◽  
Low Noise ◽  
X Rays ◽  
Technical Problems ◽  
Pixel Detectors ◽  
Exciting Beam

Kossel line patterns contain information on the crystalline structure, such as the magnitude and the phase of Bragg reflections. For technical reasons, most of these patterns are obtained using electron beam excitation, which leads to surface sensitivity that limits the spatial extent of the structural information. To obtain the atomic structure in bulk volumes, X-rays should be used as the excitation radiation. However, there are technical problems, such as the need for high resolution, low noise, large dynamic range, photon counting, two-dimensional pixel detectors and the small spot size of the exciting beam, which have prevented the widespread use of Kossel pattern analysis. Here, an experimental setup is described, which can be used for the measurement of Kossel patterns in a reasonable time and with high resolution to recover structural information.

Detector commissioning and development for PETRA-III

2010 ◽  
Vol 1 (SRMS-7) ◽  
Author(s):  
David Pennicard ◽  
Heinz Graafsma ◽  
Michael Lohmann
Keyword(s):  
High Speed ◽  
Materials Science ◽  
Dynamic Range ◽  
Photon Counting ◽  
High Energy ◽  
X Rays ◽  
Silicon Detectors ◽  
Time Resolved ◽  
Wide Range ◽  
Synchrotron Light

The new synchrotron light source PETRA-III produced its first beam last year. The extremely high brilliance of PETRA-III and the large energy range of many of its beamlines make it useful for a wide range of experiments, particularly in materials science. The detectors at PETRA-III will need to meet several requirements, such as operation across a wide dynamic range, high-speed readout and good quantum efficiency even at high photon energies. PETRA-III beamlines with lower photon energies will typically be equipped with photon-counting silicon detectors for two-dimensional detection and silicon drift detectors for spectroscopy and higher-energy beamlines will use scintillators coupled to cameras or photomultiplier tubes. Longer-term developments include ‘high-Z’ semiconductors for detecting high-energy X-rays, photon-counting readout chips with smaller pixels and higher frame rates and pixellated avalanche photodiodes for time-resolved experiments.

scholarly journals Simulation Research of Potential Contrast Agents for X-Ray Fluorescence CT with Photon Counting Detectors

2021 ◽  
Vol 9 ◽  
Author(s):  
Luo Yan ◽  
Feng Peng ◽  
Zhao Ruge ◽  
Zhang Yi ◽  
An Kang ◽  
...  
Keyword(s):  
Contrast Agents ◽  
Imaging System ◽  
Photon Counting ◽  
X Rays ◽  
Simulation Research ◽  
Fluorescence Efficiency ◽  
Detectable Concentration ◽  
Novel Method ◽  
Photon Counting Detectors ◽  
Imaging Conditions

XFCT is a novel method for the early cancer detection. Increasing concentration of contrast agents and incident X-rays’ energy were used to improve detecting accuracy, which greatly increased the prevalence of contrast-induced nephropathy. Therefore, this research explores the adaptive contrast agents and uses Geant4 to simulate the imaging conditions of Pt, Bi, Gd, Ru, and Au for searching the lowest detectable concentration based on the fast multi-pinhole collimated XFCT (fmpc-XFCT) imaging system and low incident energy. Several imaging parameters including pinhole radius (0.7, 0.8, and 1 mm) were adjusted, and the optimized EM-TV algorithm was used to reconstruct XFCT images. It is found that Bi element is superior to other metal elements in terms of the contrast-to-noise ratio (CNR) and fluorescence efficiency, and the lowest concentration that can be detected is 0.12% with optimal parameters.

scholarly journals Characterization and performance evaluation of the XSPA-500k detector using synchrotron radiation

2021 ◽  
Vol 28 (2) ◽  
pp. 439-447
Author(s):  
Yasukazu Nakaye ◽  
Takuto Sakumura ◽  
Yasutaka Sakuma ◽  
Satoshi Mikusu ◽  
Arkadiusz Dawiec ◽  
...  
Keyword(s):  
High Performance ◽  
Performance Metrics ◽  
Dynamic Range ◽  
Photon Counting ◽  
High Sensitivity ◽  
High Dynamic Range ◽  
Frame Rate ◽  
X Rays ◽  
Response Modulation ◽  
Modulation Transfer

Hybrid photon counting (HPC) detectors are widely used at both synchrotron facilities and in-house laboratories. The features of HPC detectors, such as no readout noise, high dynamic range, high frame rate, excellent point spread function, no blurring etc. along with fast data acquisition, provide a high-performance detector with a low detection limit and high sensitivity. Several HPC detector systems have been developed around the world. A number of them are commercially available and used in academia and industry. One of the important features of an HPC detector is a fast readout speed. Most HPC detectors can easily achieve over 1000 frames s−1, one or two orders of magnitude faster than conventional CCD detectors. Nevertheless, advanced scientific challenges require ever faster detectors in order to study dynamical phenomena in matter. The XSPA-500k detector can achieve 56 kframes s−1 continuously, without dead-time between frames. Using `burst mode', a special mode of the UFXC32k ASIC, the frame rate reaches 1 000 000 frames s−1. XSPA-500k was fully evaluated at the Metrology beamline at Synchrotron SOLEIL (France) and its readout speed was confirmed by tracking the synchrotron bunch time structure. The uniformity of response, modulation transfer function, linearity, energy resolution and other performance metrics were also verified either with fluorescence X-rays illuminating the full area of the detector or with the direct beam.

Photon counting x-ray imaging withK-edge filtered x-rays: A simulation study

2016 ◽  
Vol 43 (3) ◽  
pp. 1385-1400 ◽  
Author(s):  
Haluk Atak ◽  
Polad M. Shikhaliev
Keyword(s):  
Simulation Study ◽  
Photon Counting ◽  
X Rays ◽  
X Ray ◽  
X Ray Imaging

scholarly journals High-flux ptychographic imaging using the new 55 µm-pixel detector `Lambda' based on the Medipix3 readout chip

2014 ◽  
Vol 70 (6) ◽  
pp. 552-562 ◽  
Author(s):  
R. N. Wilke ◽  
J. Wallentin ◽  
M. Osterhoff ◽  
D. Pennicard ◽  
A. Zozulya ◽  
...  
Keyword(s):  
Dynamic Range ◽  
Single Photon ◽  
Photon Counting ◽  
High Dynamic Range ◽  
Photon Flux ◽  
Photon Flux Density ◽  
X Rays ◽  
Single Photon Detection ◽  
Pixel Detector ◽  
High Count

Suitable detection systems that are capable of recording high photon count rates with single-photon detection are 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 of the high count rate of the Lambda and dynamic range expansion by the semi-transparent central stop, a high-dynamic-range diffraction signal covering more than seven orders of magnitude has been recorded, which corresponds to a photon flux density of about 105 photons nm−2 s−1or a flux of ∼1010 photons s−1on the sample. By comparison with data taken without the semi-transparent central stop, an increase in resolution by a factor of 3–4 is determined: from about 125 nm to about 38 nm for the nanowire and from about 83 nm to about 21 nm for the illuminating wavefield.

Detective quantum efficiency for photon-counting hybrid pixel detectors in the tender X-ray domain: application to Medipix3RX

2016 ◽  
Vol 23 (1) ◽  
pp. 206-213 ◽  
Author(s):  
Jean Rinkel ◽  
Debora Magalhães ◽  
Franz Wagner ◽  
Florian Meneau ◽  
Flavio Cesar Vicentin
Keyword(s):  
Energy Range ◽  
Quantum Efficiency ◽  
Imaging Techniques ◽  
Photon Counting ◽  
Absorption Efficiency ◽  
Detective Quantum Efficiency ◽  
Electronic Noise ◽  
X Rays ◽  
X Ray ◽  
Pixel Detectors

Synchrotron-radiation-based X-ray imaging techniques using tender X-rays are facing a growing demand, in particular to probe theKabsorption edges of low-Zelements. Here, a mathematical model has been developed for estimating the detective quantum efficiency (DQE) at zero spatial frequency in the tender X-ray energy range for photon-counting detectors by taking into account the influence of electronic noise. The experiments were carried out with a Medipix3RX ASIC bump-bonded to a 300 µm silicon sensor at the Soft X-ray Spectroscopy beamline (D04A-SXS) of the Brazilian Synchrotron Light Laboratory (LNLS, Campinas, Brazil). The results show that Medipix3RX can be used to develop new imaging modalities in the tender X-ray range for energies down to 2 keV. The efficiency and optimal DQE depend on the energy and flux of the photons. The optimal DQE values were found in the 7.9–8.6 keV photon energy range. The DQE deterioration for higher energies due to the lower absorption efficiency of the sensor and for lower energies due to the electronic noise has been quantified. The DQE for 3 keV photons and 1 × 104 photons pixel−1s−1is similar to that obtained with 19 keV photons. Based on our model, the use of Medipix3RX could be extended down to 2 keV which is crucial for coming applications in imaging techniques at modern synchrotron sources.

scholarly journals MHz pump and probe combined with XAS-XES

2014 ◽  
Vol 70 (a1) ◽  
pp. C127-C127
Author(s):  
Pieter Glatzel
Keyword(s):  
Single Photon ◽  
Pulse Length ◽  
Photon Counting ◽  
European Synchrotron Radiation Facility ◽  
Theoretical Interpretation ◽  
X Rays ◽  
X Ray ◽  
X Ray Scattering ◽  
Pump And Probe ◽  
Ray Scattering

We implemented a MHz pump and probe scheme on beamline ID26 of the European Synchrotron Radiation Facility. The laser runs at 1.4 MHz in the ESRF 16b mode and thus pumps every fourth pulse with ca. 15 uJ per pulse and 350 fs pulse length. The beamline hosts an X-ray emission spectrometer and thus allows combining resonant inelastic X-ray scattering with a MHz pump and probe schemes. The scattered X-rays are recorded with an avalanche photodiode in single photon counting mode. We measured the transient spectra of the spin cross-over transition in [Fe(bpy)3]Cl2 of the non-resonant Ka lines and of 1s2p resonant inelastic X-ray scattering (RIXS) at the K absorption pre-edge of Fe. The Ka transient spectrum can be readily modeled using crystal field multiplet calculations because the spectra mainly depend on the Fe spin state. The 1s2p RIXS is richer in information because it also probes the unoccupied molecular orbitals and a theoretical interpretation is more challenging.

Sign in / Sign up

Export Citation Format

Share Document