A5105821697- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- CCD and CMOS Imaging Sensors
- Medical Imaging Techniques and Applications
- Advanced X-ray and CT Imaging
- Radiation Effects in Electronics
- Industrial Vision Systems and Defect Detection
- Photovoltaic System Optimization Techniques
- Nuclear Physics and Applications
- Advancements in Semiconductor Devices and Circuit Design
- Integrated Circuits and Semiconductor Failure Analysis
- Image Enhancement Techniques
- Infrared Target Detection Methodologies
- Particle physics theoretical and experimental studies
Taylor's University
2024
University of Geneva
2018-2020
European Organization for Nuclear Research
2007-2017
University of Houston
2016
The Medipix3 chips have been designed to permit spectroscopic imaging in highly segmented hybrid pixel detectors. Spectral degradation due charge sharing the sensor has addressed by means of an architecture which adjacent pixels communicate analog and digital domains on event-by-event basis reconstruct deposited a neighbourhood prior assignation hit single pixel. Medipix3RX chip is presented. first results for characterization with 300 μm thick Si sensors are given. ∼ 72e− r.m.s. noise 40e−...
Semiconductor detector readout chips with pulse processing electronics have made possible spectroscopic X-ray imaging, bringing an improvement in the overall image quality and, case of medical a reduction dose delivered to patient. In this contribution we review state art semiconductor-detector ASICs for imaging emphasis on hybrid pixel technology. We discuss how some key challenges technology (such as dealing high fluxes, maintaining spectral fidelity, power consumption density) are...
The Medipix3 chip is a hybrid pixel detector readout working in Single Photon Counting Mode. It has been developed with new front-end architecture aimed at eliminating the spectral distortion produced by charge diffusion highly segmented semiconductor detectors. In deposited overlapping clusters of four pixels summed event-by-event and incoming quantum assigned as single hit to summing circuit biggest deposit (this mode operation called Charge Summing Mode (CSM)). Pixel (SPM) reconstruction...
The Medipix3 Collaboration has broken new ground in spectroscopic X-ray imaging and single particle detection tracking. This paper will review briefly the performance limitations of present generation pixel detector readout chips developed by Collaboration. Through Silicon Via technology potential to provide a significant improvement tile-ability more flexibility choice architecture. been explored context 3 projects with CEA-LETI using Timepix3 wafers. next aim improved at rates compatible...
This paper describes a front-end for hybrid pixel readout chips, which was developed the Timepix3 and Smallpix ASICs. The contains single-ended preamplifier with structure leakage current compensation can handle both signal polarities, single-threshold discriminator pixel-to-pixel mismatch. Preamplifier are required to be fast, allow Time-Of-Arrival (TOA) measurement resolution of 1.56 ns. Time-Over-Threshold (TOT) is also measured; monotonicity TOT respect input charge greatly improved as...
VeloPix, a 130 nm CMOS technology chip with data driven and zero suppressed readout, will be used as readout for the hybrid pixel system of LHCb Vertex Locator (VELO) upgrade. The upgrade, scheduled LHC Run-3, enable experiment to read out at 40 MHz in trigger-less mode, event selection being performed CPU farm. highest occupancy ASICs experience rates more than 900 Mhits/s, closest pixels are 5.1 mm from beams. This paper present VeloPix ASIC along first test results without sensor.
High Voltage Monolithic Active Pixel Sensors (HV-MAPS) are based on a commercial CMOS process and collect charge by drift inside reversely biased diode. HV-MAPS represent promising technology for future pixel tracking detectors. Two recent developments presented. The MuPix has continuous readout is being developed the Mu3e experiment whereas ATLASPix LHC applications with triggered readout. Both variants have fully monolithic design including state machines, clock circuitries serial drivers....
Monolithic active pixel sensors (MAPS) based on commercial high-voltage CMOS processes are an exciting technology that is considered as option for the ATLAS Inner Tracker upgrade. Particles detected using deep n-wells a p-type substrate sensor diodes with depleted region extending into silicon bulk. With readout electronics and integrated same device, detector complexity material budget greatly reduced. The ATLASPix1 prototype large-scale MAPS implements full chain single physical chip. It...
Measurements are shown of GeV pions and muons in two 300µm thick, Si Medipix pixel detector assemblies that stacked on top each other, with a 25µm thick brass foil between.In such radiation imaging semiconductor matrix large number pixels along the particle trail, one can determine local space vectors for trajectory instead points.This improves pattern recognition track reconstruction, especially crowded environment.Stacking sensor planes is essential resolving directional ambiguities.Signal...
The Dosepix detector is a hybrid photon-counting pixel based on ideas of the Medipix and Timepix family. 1 mm thick cadmium telluride 300 μm silicon were used as sensor material. matrix consists 16 x square pixels with 12 rows (200 μm)2 4 (55 sensitive area for layer 220 pitch CdTe. Besides digital energy integration mode, novel concept binning included in electronics, allowing energy-resolved measurements bins within one acquisition. possibilities this range from applications personal...
We present the first measurements of performance Medipix3 hybrid pixel readout chip after exposure to significant x-ray flux. Specifically changes in mixed mode architecture, digital periphery, analogue converters and e-fuse technology were characterised. A high intensity, calibrated xray source was used incrementally irradiate separate regions detector whilst it powered. This is total ionizing dose study a large area fabricated using 130nm CMOS technology.
In view of the tracking detector application to ATLAS High Luminosity LHC (HL-LHC) upgrade, we have developed a new generation Voltage CMOS (HV-CMOS) monolithic pixel-sensor prototypes featuring AMS aH18 (180 nm) commercial technology. By fully integrating both analog and digital readout-circuitry on same particle-detecting substrate, current challenges hybrid sensor technologies, i.e., larger readout input-capacitance, lower production-yield, higher production integration cost, can be...
Hybrid pixel detectors process impinging photons using front-end electronics electrically connected to a segmented sensor via solder bumps. This allows for complex in-pixel processing while maintai ...
We report on the experimental study made a successive prototype of High-Voltage CMOS (HV-CMOS) ATLASPix2 sensor for tracking detector application, developed with 180 nm feature size. These sensors are to qualify mainly peripheral data processing blocks (e.g. Command Decoder, Trigger Buffer, etc.). It is smaller version 24 X 36 pixelated in comparison earlier generation ATLASPix1 fabricated both ams AG, Austria, and TSI Semiconductors, USA. While produced showed breakdown voltage 50 V...