8,640 research outputs found
Diamond Detectors for the TOTEM Timing Upgrade
This paper describes the design and the performance of the timing detector
developed by the TOTEM Collaboration for the Roman Pots (RPs) to measure the
Time-Of-Flight (TOF) of the protons produced in central diffractive
interactions at the LHC. The measurement of the TOF of the protons allows the
determination of the longitudinal position of the proton interaction vertex and
its association with one of the vertices reconstructed by the CMS detectors.
The TOF detector is based on single crystal Chemical Vapor Deposition (scCVD)
diamond plates and is designed to measure the protons TOF with about 50 ps time
precision. This upgrade to the TOTEM apparatus will be used in the LHC run 2
and will tag the central diffractive events up to an interaction pileup of
about 1. A dedicated fast and low noise electronics for the signal
amplification has been developed. The digitization of the diamond signal is
performed by sampling the waveform. After introducing the physics studies that
will most profit from the addition of these new detectors, we discuss in detail
the optimization and the performance of the first TOF detector installed in the
LHC in November 2015.Comment: 26 pages, 18 figures, 2 tables, submitted for publication to JINS
Optimal use of Charge Information for the HL-LHC Pixel Detector Readout
The pixel detectors for the High Luminosity upgrades of the ATLAS and CMS
detectors will preserve digitized charge information in spite of extremely high
hit rates. Both circuit physical size and output bandwidth will limit the
number of bits to which charge can be digitized and stored. We therefore study
the effect of the number of bits used for digitization and storage on single
and multi-particle cluster resolution, efficiency, classification, and particle
identification. We show how performance degrades as fewer bits are used to
digitize and to store charge. We find that with limited charge information (4
bits), one can achieve near optimal performance on a variety of tasks.Comment: 27 pages, 20 figure
Digital maturity variables and their impact on the enterprise architecture layers
This study examines the variables of digital maturity of companies. The framework for enterprise architectures Archimate 3.0 is used to compare the variables. The variables are assigned to the six layers of architecture: Strategy, Business Environment, Applications, Technology, Physical and Implementation and Migration. On the basis of a literature overview, 15 “digital maturity models” with a total of 147 variables are analyzed. The databases Scopus, EBSCO – Business Source Premier and ProQuest are used for this purpose
Irradiation study of a fully monolithic HV-CMOS pixel sensor design in AMS 180 nm
High-Voltage Monolithic Active Pixel Sensors (HV-MAPS) based on the 180 nm
HV-CMOS process have been proposed to realize thin, fast and highly integrated
pixel sensors. The MuPix7 prototype, fabricated in the commercial AMS H18
process, features a fully integrated on-chip readout, i.e. hit-digitization,
zero suppression and data serialization. It is the first fully monolithic
HV-CMOS pixel sensor that has been tested for the use in high irradiation
environments like HL-LHC. We present results from laboratory and test beam
measurements of MuPix7 prototypes irradiated with neutrons (up to
) and protons (up to ) and compare the performance with non-irradiated
sensors. Efficiencies well above 90 % at noise rates below 200 Hz per pixel are
measured. A time resolution better than 22 ns is measured for all tested
settings and sensors, even at the highest irradiation fluences. The data
transmission at 1.25 Gbit/s and the on-chip PLL remain fully functional
Pixel detector R&D for the Compact Linear Collider
The physics aims at the proposed future CLIC high-energy linear
collider pose challenging demands on the performance of the detector system. In
particular the vertex and tracking detectors have to combine precision
measurements with robustness against the expected high rates of beam-induced
backgrounds. A spatial resolution of a few microns and a material budget down
to 0.2\% of a radiation length per vertex-detector layer have to be achieved
together with a few nanoseconds time stamping accuracy. These requirements are
addressed with innovative technologies in an ambitious detector R\&D programme,
comprising hardware developments as well as detailed device and Monte Carlo
simulations based on TCAD, Geant4 and Allpix-Squared. Various fine pitch hybrid
silicon pixel detector technologies are under investigation for the CLIC vertex
detector. The CLICpix and CLICpix2 readout ASICs with \SI{25}{\micro\meter}
pixel pitch have been produced in a \SI{65}{\nano\meter} commercial CMOS
process and bump-bonded to planar active edge sensors as well as capacitively
coupled to High-Voltage (HV) CMOS sensors. Monolithic silicon tracking
detectors are foreseen for the large surface (
\SI{140}{\meter\squared}) CLIC tracker. Fully monolithic prototypes are
currently under development in High-Resistivity (HR) CMOS, HV-CMOS and Silicon
on Insulator (SOI) technologies. The laboratory and beam tests of all recent
prototypes profit from the development of the CaRIBou universal readout system.
This talk presents an overview of the CLIC pixel-detector R\&D programme,
focusing on recent test-beam and simulation results.Comment: On behalf of CLICdp collaboration, Conference proceedings for
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