High granularity Semi-Digital Hadronic Calorimeter using GRPCs Mannai, S.; Manai, K.; Haddad, Y. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
08/2013, Letnik:
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A Semi-Digital Hadronic Calorimeter using Glass Resistive Plate Chambers (GRPCs) is one of the calorimeters candidates proposed for particle physics experiments at the future electrons collider. It ...is a high granular calorimeter which is required for application of the particle flow algorithm in order to improve the jet energy resolution to achieve 30%/E as one of the goals of these experiments.
The Semi-Digital Hadronic CALorimeter(SDHCAL) using Glass Resistive Plate Chambers (GRPCs) is one of the calorimeters proposed for particle physics experiments at the future electron-positron ...collider. It is a high granularity calorimeter which is required for the application of the particle flow algorithm in order to improve the jet energy resolution as one of the goals of this experiments. We discuss the energy reconstruction, based on digital and semi-Digital methods, to study the effect on the improvement of the single particle energy resolution and the linearity of the detecor response. This study was performed with the GEANT4 simulation. Results on the energy resolution and linearity, for negative pions over an energy range from 1 to 100 GeV are presented and compared with different energy reconstruction methods including Artificial Neural Networks.
Le nombre des patients insuffisants rénaux chroniques (IRC) ne cesse d’augmenter au cours de ces dernières années. L’IRC est fortement associée à l’accélération des maladies cardiovasculaires ...responsables de près de la moitié de la mortalité chez ces patients. Nous proposons d’étudier les profils épidémiologiques, cliniques et thérapeutiques du syndrome coronarien aigu chez les IRC.
Il s’agissait d’une étude rétrospective et descriptive colligeant les patients ayant présenté un syndrome coronarien aigu (SCA) avec ou sans sus-décalage du segment ST hospitalisés dans le service de cardiologie à l’hôpital des forces de sécurité intérieure la Marsaentre 2010 à 2016. Notre population d’étude était divisée en deux groupes : groupe 1 : les patients ayant une fonction rénale normale avec une clairance de la créatinine supérieure ou égale à 60mL/mn. (n=50) groupe 2 : les patients ayant une insuffisance rénale chronique soit une clairance de la créatinine inférieure à 60mL/mn. (n=50).
Nous avons constaté une prédominance masculine dans les deux groupes. Les patients du groupe 2 étaient plus âgés (54,8/68,9 ans, p<0,001). Le diabète (p : 0,005) et l’HTA (p : 0,008) étaient significativement plus fréquents chez les patients du groupe 2 ainsi que le BMI qui était plus important (p : 0,004). Au moment du syndrome coronarien, les patients du groupe 2 avaient plus de tachycardie (p : 0,006) et d’œdème aigu pulmonaire (p<0,001). Le SCA sans sus-décalage ST était plus signalé dans le groupe 2 (p : 0,046), en cas de SCA avec sus-décalage ST le territoire antérieure était plus fréquent dans le groupe 2 (p : 0,014). Le score TIMI(p : 0,001) ainsi que le score GRACE (p : 0,001) étaient nettement plus élevés dans le groupe 2. Quant aux paramètres échographiques, l’hypertrophie ventriculaire gauche (p : 0,001), l’altération de la fonction systolique (p : 0,01) ainsi que les calcification aortiques (p : 0,05) sont plus notées dans le groupe 2.
L’IRC aggrave le tableau initial du SCA et elle expose à plus d’évènements cardiovasculaires et cérébraux majeurs par rapport aux patients à fonction rénale normale.
L’IRC est considérée actuellement un facteur de risque cardiovasculaire, sa présence rend la prise en charge du syndrome coronarien plus délicate et plus difficile.
The OPERA neutrino detector at the underground Gran Sasso Laboratory (LNGS) was designed to perform the first detection of neutrino oscillations in appearance mode, through the study of nu_mu to ...nu_tau oscillations. The apparatus consists of a lead/emulsion-film target complemented by electronic detectors. It is placed in the high-energy, long-baseline CERN to LNGS beam (CNGS) 730 km away from the neutrino source. In August 2006 a first run with CNGS neutrinos was successfully conducted. A first sample of neutrino events was collected, statistically consistent with the integrated beam intensity. After a brief description of the beam and of the various sub-detectors, we report on the achievement of this milestone, presenting the first data and some analysis results.
The use of nuclear emulsions in very large physics experiments is now possible thanks to the recent improvements in the industrial production of emulsions and to the development of fast automated ...microscopes. In this paper the hardware performances of the
European Scanning System (ESS) are described. The ESS is a very fast automatic system developed for the mass scanning of the emulsions of the OPERA experiment, which requires microscopes with scanning speeds of
∼
20
cm
2
/
h
in an emulsion volume of
44
μ
m
thickness.
The Semi-Digital Hadronic CALorimeter (SD-HCAL) is one of the two hadronic calorimeter options proposed by the International Large Detector (ILD) project for the future International Linear Collider ...experiments (ILC). It is a sampling calorimeter with 48 Glass Resistive Plate Chambers (GRPCs) finely segmented into cells of 1 cm2 ensuring a high granularity which is required for the application of the Particle Flow Algorithm (PFA) in order to improve the jet energy resolution which is the corner stone of ILC experiments. The performance of the SDHCAL technological prototype was tested successfully in beam tests at CERN several times. The main point to be discussed concerns the energy reconstruction in SDHCAL. Based on Monte Carlo Simulation of the SDHCAL prototype with Geant4, we will show different analytic energy reconstruction methods used to study the single particle energy resolution and the linearity of the detecor response to pions. In particular, we will highlight a new technique based on the Artificial Neural Network giving promising results compared to the classical analytic methods.
A large prototype of 1.3m3 was designed and built as a demonstrator of the semi-digital hadronic calorimeter (SDHCAL) concept proposed for the future ILC experiments. The prototype is a sampling ...hadronic calorimeter of 48 units. Each unit is built of an active layer made of 1m2 Glass Resistive Plate Chamber(GRPC) detector placed inside a cassette whose walls are made of stainless steel. The cassette contains also the electronics used to read out the GRPC detector. The lateral granularity of the active layer is provided by the electronics pick-up pads of 1cm2 each. The cassettes are inserted into a self-supporting mechanical structure built also of stainless steel plates which, with the cassettes walls, play the role of the absorber. The prototype was designed to be very compact and important efforts were made to minimize the number of services cables to optimize the efficiency of the Particle Flow Algorithm techniques to be used in the future ILC experiments. The different components of the SDHCAL prototype were studied individually and strict criteria were applied for the final selection of these components. Basic calibration procedures were performed after the prototype assembling. The prototype is the first of a series of new-generation detectors equipped with a power-pulsing mode intended to reduce the power consumption of this highly granular detector. A dedicated acquisition system was developed to deal with the output of more than 440000 electronics channels in both trigger and triggerless modes. After its completion in 2011, the prototype was commissioned using cosmic rays and particles beams at CERN.
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