Optimization of GEM-based detector readout electrode structure for SXR imaging of tokamak plasma

2021 ◽  
Vol 16 (11) ◽  
pp. C11014
Author(s):  
K. Malinowski ◽  
M. Chernyshova ◽  
S. Jabłoński ◽  
I. Casiragi
Keyword(s):  
Energy Range ◽  
Tokamak Plasma ◽  
Detective Quantum Efficiency ◽  
Actual Number ◽  
Electrode Structure ◽  
X Ray ◽  
X Ray Imaging ◽  
Input Spectrum ◽  
Electron Avalanches ◽  
Time Coincidence

Abstract The paper presents an optimization of a readout structure of the GEM-based detector designed for X-ray imaging for DTT tokamak in the energy range of 2–15 keV. The readout electrode of approximately 100 cm2 surface is composed of hexagonal pixels connected in a way that allows reducing the actual number of signal pixels (electronics channels). At the same time, based on time coincidence analysis, it makes possible to unambiguously identify the position of the recorded X-ray photon. For the input spectrum, the Detective Quantum Efficiency (DQE) of the detector was calculated using the Geant4 program and the spatial distributions of electron avalanches at the readout electrode were simulated using the Garfield++ program. These were conducted for a given energy range of radiation and a statistical distribution consistent with the shape of the spectrum considering the DQE of the detector. As a result, the size of a single hexagonal pixel was proposed to capture the position of the recorded radiation quanta in an optimal and effective way.

A detective quantum efficiency for spectroscopic X‐ray imaging detectors

2021 ◽  
Author(s):  
Jesse Tanguay ◽  
Devon Richtsmeier ◽  
Christopher Dydula ◽  
James A. Day ◽  
Kris Iniewski ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
Detective Quantum Efficiency ◽  
X Ray ◽  
X Ray Imaging ◽  
Imaging Detectors

scholarly journals AGILE results on relativistic outflows above 100MeV

2018 ◽  
Vol 27 (10) ◽  
pp. 1844015 ◽  
Author(s):  
Carlotta Pittori
Keyword(s):  
Particle Acceleration ◽  
Energy Range ◽  
High Energy ◽  
Extreme Conditions ◽  
X Ray ◽  
Space Agency ◽  
X Ray Imaging ◽  
Agile Satellite ◽  
Radiation Processes ◽  
Italian Space Agency

We give an overview of the AGILE [Formula: see text]-ray satellite scientific highlights. AGILE is an Italian Space Agency (ASI) mission devoted to observations in the 30[Formula: see text]MeV–50[Formula: see text]GeV [Formula: see text]-ray energy range, with simultaneous X-ray imaging in the 18–60[Formula: see text]keV band. Launched in April 2007, the AGILE satellite has completed its tenth year of operations in orbit, and it is substantially contributing to improve our knowledge of the high-energy sky. Emission from cosmic sources at energies above 100[Formula: see text]MeV is intrinsically nonthermal, and the study of the wide variety of observed Galactic and extragalactic [Formula: see text]-ray sources provides a unique opportunity to test theories of particle acceleration and radiation processes in extreme conditions.

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.

X-ray polarimetry with the microstrip gas chamber

1998 ◽  
Vol 5 (3) ◽  
pp. 857-859 ◽  
Author(s):  
Y. Nishi ◽  
S. Aoki ◽  
A. Ochi ◽  
T. Tanimori ◽  
T. Takahashi ◽  
...  
Keyword(s):  
Energy Range ◽  
Linear Polarization ◽  
Polarization Measurement ◽  
X Rays ◽  
Two Dimensional ◽  
X Ray ◽  
X Ray Imaging ◽  
Gas Chamber

A two-dimensional microstrip gas chamber (MSGC) with a 5 cm × 5 cm detection area has been developed. It has 254 anodes and 255 back strips, both with 200 µm pitches. Using this MSGC, linear polarization of X-rays was successfully measured in the energy range 6–14 keV. In addition, the performance of the MSGC as an X-ray imaging polarimeter has been simulated using the EGS4 program (Electron Gamma Shower, Version 4) modified for this purpose. In this article, the results of both the polarization measurement and the simulation are reported.

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