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Antineutrino detection using inverse beta decay conversion has demonstrated the capability to measure nuclear reactor power and fissile material content for nuclear safeguards. Current efforts focus on aboveground deployment scenarios, for which highly efficient capture and identification of neutrons is needed to measure the anticipated antineutrino event rates in an elevated background environment...
An experiment to measure the performance of 3-D position-sensitive pixellated HgI2 crystals cooled below room temperature was carried out using a new ASIC from GammaMedica-Ideas. This ASIC is capable of reading out the digitized pre-amplifier signal waveforms of 121 pixels and the cathode. A significant improvement in energy resolution from 1.48% FWHM at 662keV for the whole detector to 1.09% FWHM...
CZT drift strip detectors with Planar Transverse Field (PTF) configuration are suitable for high energy astrophysics instrumentation, where high efficiency, high energy and position resolution are required from the sensors. We report on experimental investigations on the DTU Space developed CZT drift detector operated in PTF configuration with the purpose of demonstrating that the good energy resolution...
The article describes a low temperature bump bonding process to assemble CdTe sensors to readout chips. The solder material used is In-Sn with a theoretical melting point of 118 °C. The solder was tested using Timepix readout chips with 30-μm diameter bumps and a 55-μm pitch bonded to CdTe sensors. The first results from these assemblies show very good bumping and bonding yield.
Radiation detectors were fabricated on 8 mm × 8 mm substrates, ~ 390 μm in thickness, diced from (0001) 4H-SiC semi-insulating (SI) wafer (≥ 1012 Ohm-cm). Our results on characterization including x-ray diffraction (XRD), electron beam induced current (EBIC), chemical etching, cross-polarized imaging, and Raman spectroscopy show the high quality of the SI SiC crystals, which are believed to meet the...
The CSTD project aims at developing a high resolution pixel gamma detector based on CdZnTe for Compton imaging applications. Our research group has been working recently on the design and characterization of a new pixel detector with specifications focused at high energy SPECT for medical imaging applications. The detector pitch, 0.3 mm, and its thickness, 5 mm, allows to reach high spatial resolution...
Silicon diodes with large aspect ratio perforated microstructures backfilled with 6LiF show a dramatic increase in neutron detection efficiency beyond that of conventional thin-film coated planar devices. Described in this work are advancements in the technology using detector stacking methods to increase thermal neutron detection efficiency. The highest efficiency devices thus far have delivered...
The existing muon detectors for high-energy physics experiments are mainly made of gas chambers such as Resistive Plate Chambers, Limited Streamer Tubes or Multi Wire Proportional Chambers. With the increasing luminosity of the new accelerators and the increment in dimensions of the experiments the development of a new detection technique, which is robust, cheap and capable to sustain high particle...
This article will describe the procedures used to validate and characterize the combined hardware and software DAQ system of the KATRIN experiment. The Mk4 DAQ Electronics is the latest version in a series of field programmable gate array (FPGA)-based electronics developed at the Karlsruhe Institute of Technology's Institute of Data Processing and Electronics (IPE). This system will serve as the primary...
Muon tomography based on the measurement of multiple scattering of atmospheric cosmic ray muons is a promising technique for detecting and imaging heavily shielded high-Z nuclear materials such as enriched uranium. This technique could complement standard radiation detection portals currently deployed at international borders and ports, which are not very sensitive to heavily shielded nuclear materials...
In intense, pulsed active detection, a single, intense pulse of radiation is used to induce photofission in fissionable material, increasing its detectability. The Mercury pulsed-power generator was converted to positive polarity (+3.7 MV, 325 kA, 50-ns FWHM) to drive an intense, pulsed radiation source based on the FIGARO active detection concept. The probing radiation source consisted of an ion-beam...
With the first year of successful data taking of proton-proton collisions at LHC, the full chain of the ATLAS Trigger and Data Acquisition System could be tested under real conditions. The trigger monitoring and data quality infrastructure was essential to this success. We describe the software tools used to monitor the trigger system performance, assess the overall quality of the trigger selection...
DEPFET detectors are silicon active pixel sensors for X-ray imaging spectroscopy. They will be used for the MIXS instrument of BepiColombo planetary mission and they are foreseen for the Wide Field Imager of the International X-ray Observatory currently in study with ESA, NASA and JAXA. New DEPFET matrixes with 256 × 256 pixels of 75 μm pitch have been produced, mounted on ceramic boards with dedicated...
Gamma ray tracking arrays like AGATA and GRETA are composed of position sensitive segmented HPGe detectors. In fact the gamma interaction localization with a precision of at least 5 mm is an important step to efficiently perform the tracking. This position information is obtained with the combined use of detector electrode segmentation and Pulse Shape Analysis (PSA). In this work a generalized version...
We report on the main design and technological issues related to a modified 3D-DTTC (Double-side, Double-Type-Column) detector process at FBK (Trento, Italy). With respect to the previous versions of this technology, which involved columnar electrodes of both doping types etched from both wafer sides and stopping at a short distance from the opposite surface, passing-through columns are now available...
STiC-Silicon Photomultipler (SiPM) Timing Chip, is a prtotype ASIC with 4 channels dedicated to fast timing discrimination in Positron Emmission Tomography using SiPM. It is designed in AMS 0.35μm CMOS technology. Each single channel of the chip can be operated either in constant fraction (CF) or leading edge (LE) triggering mode. The basic principle of the SiPM readout is to sink the current signal...
A coincidence detection system between 350μm pitch pixelated CZT detector and a LSO-based Inveon PET detector was built up for PET imaging application. Using different trigger mode, we studied how the triggering strategy affects the PET imaging resolution. We obtained 670μm at FWHM image resolution for coincidence events detected by CZT central pixel only. If we include coincidence events from CZT...
Charge sharing and weighting potential cross-talk between pixels are important factors that degrade the energy resolution in multiple-pixel events. However, simulation studies indicate that these factors cannot fully explain the measured energy resolution degradation for multiple-pixel events nor the Compton image distortion observed in some detector systems. This work presents simulation-based analysis...
Compound semiconductors detectors, such as Cadmium Telluride (CdTe) and Cadmium Zinc Telluride (CdZnTe), have demonstrated spectroscopic performances for X- and Gamma-ray detection at room temperature operation. Several groups are working on using these detector materials for use in high rate photon counting / energy resolving pixelated detector systems. This paper is focused on the modelling from...
A 100 μm × 100 μm readout cell with a power consumption of 15 μW and optimized for 12 bits dynamic range is presented. This circuit has been developed to readout the hybrid pixel sensors for the Micro-Vertex Detector (MVD) of the PANDA experiment at GSI. The readout architecture is based on the Time-over-Threshold technique which allows to achieve low-power charge measurement with a high dynamic range...
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