292 research outputs found
Atlaspix3: A high voltage CMOS sensor chip designed for ATLAS Inner Tracker
ATLASpix3 is a 2 x 2 cm high voltage CMOS sensor chip designed to meet the specifications of outer layers of ATLAS inner tracker. It is compatible with the hybrid pixel sensor ASIC RD53A in terms of electronic interface and geometry. ATLASpix3 is a depleted monolithic CMOS pixel detector which allows the construction of quad modules of the same size as that of hybrid sensors. The readout scheme can be externally configured as triggered or triggerless column drain readout. The hit information is transmitted through a 1.28 Gbit/s serial link. The interface is based on a single command input that is used for providing clock, trigger and configuration commands. This contribution summarizes the detector architecture with focus on the design of its readout circuitry. In addition, simulation results obtained using ReadOut Modelling Environment (ROME), that led to the design of the readout system are discussed
Status of HVCMOS developments for ATLAS
This paper describes the status of the developments made by ATLAS HVCMOS and HVMAPS collaborations. We have proposed two HVCMOS sensor concepts for ATLAS pixelsâthe capacitive coupled pixel detector (CCPD) and the monolithic detector. The sensors have been implemented in three semiconductor processes AMS H18, AMS H35 and LFoundry LFA15. Efficiency of 99.7% after neutron irradiation to 1015 neq/cm2W has been measured with the small area CCPD prototype in AMS H18 technology. About 84% of the particles are detected with a time resolution better than 25 ns. The sensor was implemented on a low resistivity substrate. The large area demonstrator sensor in AMS H35 process has been designed, produced and successfully tested. The sensor has been produced on different high resistivity substrates ranging from 80 Ωcm to more than 1 kΩ. Monolithic- and hybrid readout are both possible. In August 2016, six different monolithic pixel matrices for ATLAS with a total area of 1 cm2 have been submitted in LFoundry LFA15 process. The matrices implement column drain and triggered readout as well as waveform sampling capability on pixel level. Design details will be presented
ATLASPIX3 Modules for Experiments at Electron-Positron Colliders
High-voltage CMOS detectors are being developed for application in High-Energy Physics. ATLASPIX3 is a full-reticle size monolithic pixel detector, consisting of 49000 pixels of dimension 50Ă150 ÎŒm. It has been realized in in TSI 180 nm HVCMOS technology. In view of applications at future electron-positron colliders, multi-chip-modules are built. The module design and its characterization by electrical test and radiation sources will be illustrated, including characterization of shunt regulators for serial chain powering. Lightweight long structure to support and to cool multiple-module chain are also being realized. The multi-chip-modules performance shows no degradation with respect to single-chip devices and the level of integration achieved is suitable for tracking at future e+e- accelerators
First Results of ATLASPix 3.1 Testbeam
The ATLASPix sensor has been developed as a monolithic High Voltage CMOS sensor candidate for the ATLAS inner tracker upgrade. The ATLASPix3 is the third version, and is the first full reticle-sized sensor developed for multi-module compatibility. The detector is operational, and has been tested as a single chip, and as a 4-layer telescopes in an electron testbeam, with energies up to 6 GeV at DESY. First results of the testbeam data analysis are presented here
MuPix and ATLASPix -- Architectures and Results
High Voltage Monolithic Active Pixel Sensors (HV-MAPS) are based on a
commercial High Voltage CMOS process and collect charge by drift inside a
reversely biased diode. HV-MAPS represent a promising technology for future
pixel tracking detectors. Two recent developments are presented. The MuPix has
a continuous readout and is being developed for the Mu3e experiment whereas the
ATLASPix is being developed for LHC applications with a triggered readout. Both
variants have a fully monolithic design including state machines, clock
circuitries and serial drivers. Several prototypes and design variants were
characterised in the lab and in testbeam campaigns to measure efficiencies,
noise, time resolution and radiation tolerance. Results from recent MuPix and
ATLASPix prototypes are presented and prospects for future improvements are
discussed.Comment: 10 pages, proceedings, The 28th International Workshop on Vertex
Detectors (VERTEX 2019), 13 - 18 Oct 2019, Lopud Island, Croati
Technical design of the phase I Mu3e experiment
The Mu3e experiment aims to find or exclude the lepton flavour violating
decay at branching fractions above . A first
phase of the experiment using an existing beamline at the Paul Scherrer
Institute (PSI) is designed to reach a single event sensitivity of . We present an overview of all aspects of the technical design and
expected performance of the phase~I Mu3e detector. The high rate of up to
muon decays per second and the low momenta of the decay electrons and
positrons pose a unique set of challenges, which we tackle using an ultra thin
tracking detector based on high-voltage monolithic active pixel sensors
combined with scintillating fibres and tiles for precise timing measurements.Comment: 114 pages, 185 figures. Submitted to Nuclear Instruments and Methods
A. Edited by Frank Meier Aeschbacher This version has many enhancements for
better readability and more detail
Technical design of the phase I Mu3e experiment
The Mu3e experiment aims to find or exclude the lepton flavour violating decay ÎŒâeee at branching fractions above 10â16. A first phase of the experiment using an existing beamline at the Paul Scherrer Institute (PSI) is designed to reach a single event sensitivity of 2â
10â15. We present an overview of all aspects of the technical design and expected performance of the phase I Mu3e detector. The high rate of up to 108 muon decays per second and the low momenta of the decay electrons and positrons pose a unique set of challenges, which we tackle using an ultra thin tracking detector based on high-voltage monolithic active pixel sensors combined with scintillating fibres and tiles for precise timing measurements
Joint analysis of the energy spectrum of ultra-high-energy cosmic rays measured at the Pierre Auger Observatory and the Telescope Array
The measurement of the energy spectrum of ultra-high-energy cosmic rays (UHECRs) is of crucial importance to clarify their origin and acceleration mechanisms. The Pierre Auger Observatory in Argentina and the Telescope Array (TA) in the US have reported their measurements of UHECR energy spectra observed in the southern and northern hemisphere, respectively. The region of the sky accessible to both Observatories ([â15,+24] degrees in declination) can be used to cross-calibrate the two spectra.
The Auger-TA energy spectrum working group was organized in 2012 and has been working to understand the uncertainties in energy scale in both experiments, their systematic differences, and differences in the shape of the spectra. In previous works, we reported that there was an overall agreement of the energy spectra measured by the two observatories below 10 EeV while at higher energies, a remaining significant difference was observed in the common declination band. We revisit this issue to understand its origin by examining the systematic uncertainties, statistical effects, and other possibilities. We will also discuss the differences in the spectra in different declination bands and a new feature in the spectrum recently reported by the Auger Collaboration
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