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We are developing monolithic pixel detectors with a 0.2 um CMOS, fully-depleted silicon-on-insulator (SOI) technology. The substrate is high-resistivity silicon and works as a radiation sensor having p-n junctions. The SOI layer is a 40 nm thick silicon, where readout electronics is implemented. There is a buried oxide (BOX) layer between these silicon layers. There is no mechanical bonding in the...
We studied the feasibility of monolithic silicon-germanium front-ends for cryogenic semiconductor detectors. In this framework we designed and simulated a low-noise Charge Sensitive Preamplifier for High Purity Germanium detectors using the Austria Micro System S35 silicon-germanium technology. The preamplifier uses two silicon-germanium Hetero-junction Bipolar Transistors, a few silicon Metal-Oxide-Silicon...
For the readout of the TRD sub-detector of the planned fixed-target CBM experiment at FAIR/GSI (Darmstadt, Germany), a new self-triggered amplification and digitization mixed-signal chip is being developed. The final ASIC will have 32-64 channels each composed of a low noise and power charge preamplifier, a 7-9 Bit pipeline ADC running at about 25 MSamples/s and some digital data processing units...
The present paper focuses on the development of the SimPET simulation tool intended for the estimation of the solidstate photons detector (Silicon Photomultiplier, SiPM, or Multi-Pixel Photon Counter, MPPC) and front-end electronics responses to scintillations generated in LYSO crystals of a PET scanner. The SimPET simulation software is presented, including the description of methods and algorithms...
We have developed a Monte-Carlo photon-tracking and readout simulator called SCOUT to study the stochastic behavior of signals output from a simplified rectangular scintillation-camera design. SCOUT models the salient processes affecting signal generation, transport, and readout. Presently, we compare output signal statistics from SCOUT to experimental results for both a discrete and a monolithic...
Multi-gap Resistive Plate Chamber (MRPC), which has excellent performance and relatively low cost per channel, is a good candidate for Time-of-Flight (TOF) system in modern high energy physics experiments. A new kind of MRPC, Long-strip MRPC (LMRPC) with 50 cm × 2.5 cm strips, was tested at GSI-FOPI with secondary beam. The resets show that this LMRPC prototype can achieve 60 to 70 ps σ time resolution...
LHCb is a dedicated experiment to study new physics in the decays of beauty and charm hadrons at the Large Hadron Collider (LHC) at CERN. The beauty and charm hadrons are identified through their flight distance in the Vertex Locator (VELO), and hence the detector is critical for both the trigger and offline physics analyses. The VELO is the silicon detector surrounding the interaction point, and...
The LHCb detector is designed to study the decays of B-mesons in proton-proton collisions at the Large Hadron Collider (LHC). The detector is a single arm forward spectrometer with excellent tracking and particle identification capabilities. The Silicon Tracker (ST) consists of two detectors both of which are constructed from silicon micro-strip detectors with long readout strips. The performance...
For the Belle-II detector, we are conducting R&D on proximity focusing ring imaging Cherenkov (RICH) detector using a silica aerogel as a radiator. A 144-channel HAPD (Hybrid Avalanche Photo Detector) is adopted as a photo-detector for the Aerogel-RICH. Because the typical gain of HAPDs is lower than conventional photomultipliers, we need high-gain and low-noise electronics for readout of the...
There is considerable interest to develop new time-of-flight detectors using micro-channel-plate photomultiplier tubes (MCP-PMTs). The question we pose in this paper is whether available waveform digitizer ASICs, such as the WaveCatcher or TARGET, operating with a sampling rate of 2-3 GSa/s, can compete with 1GHz BW CFD/TDC/ADC electronics. We have performed a series of measurements with these waveform...
We have developed a very high channel density custom A/D converter module for the drift chamber readout requirements of the Glue-X detector at Jefferson Lab Hall-D. This 6U VME64× module has 72 channels, including a low noise differential line receiver, cable frequency response equalization, and signal shaping with a 5th order filter. The signals are digitized at 125 MSPS with an assembly option for...
The feature-extraction algorithm, developed for the digital front-end electronics of the electromagnetic calorimeter of the PANDA detector at the future FAIR facility, is implemented in VHDL for a commercial 16 bit 100 MHz sampling ADC. The use of modified firmware with the running on-line data-processing algorithm will allow to perform realistic performance studies of the calorimeter and test a trigger-less...
In this work we present the first results of a detector characterization technique named Pulse Shape Comparison Scan (PSCS), applied to a large volume segmented HPGe detector of the AGATA array. The experimental data were collected with the Liverpool University scanning system. Processing two sets of singles scan data acquired with a 137Cs (662 keV) gamma collimated source (with the collimation lines...
We have found that modified Broad Energy Ge detectors produced by CANBERRA have several promising features, including large mass, low electronic noise, and excellent pulse-shape analysis capabilities. Modified BEGe detectors obtain these capabilities due to their low-capacitance “point-contact” electrode configuration. Modified BEGes are also the only point-contact design fabricated on a commercial...
The Silicon Tracking System (STS) is a key detector of the CBM experiment planned at the Facility for Antiproton and Ion Research (FAIR). It has to reconstruct the trajectories of hundreds of charged particles created in heavy-ion collisions at typical beam energies of 25 GeV/nucleon. Radiation hard sensors and fast read out electronics are needed to match the interaction rates of up to 10 MHz. A...
As a result of a comprehensive study aimed at the development of integrated front-end electronics suitable for Silicon Photomultiplier detectors, a 32-channel self-triggered ASIC has been designed in a standard 0.35μm CMOS technology. Characterization measurements, carried out exploiting an external injection capacitance, demonstrate that the architecture of the analog channel, based on a full current-mode...
New Micromegas (Micro-mesh gaseous) detectors are being developed in view of the future physics projects planned by the COMPASS collaboration at CERN. The two objectives for the future detectors are to make active their central area which sees the beam, and to make them stand hadron beam flux five time higher than the present detectors. These objectives require different changes in the detector structures:...
The ATLAS Transition Radiation Tracker (TRT) is the outermost of the three sub-systems of the ATLAS Inner Detector at the Large Hadron Collider (LHC) at CERN. It consists of close to 300000 thin-walled drift tubes (straws) providing on average 30 two-dimensional space points with 130 μm resolution for charged particle tracks with |η| <; 2 and pT >; 0.5 GeV. Along with continuous tracking, it...
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...
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