1,721,203 research outputs found
CMS Pixel detector for the Phase I upgrade at HL-LHC
Full text linkThe CMS pixel detector is part of the complex tracking system of the CMS experiment at the LHC collider (CERN, Geneva CH). It has been designed for a stable operation and optimal performance at the LHC instantaneous luminosity L =10 cms. The future plans of the LHC collider
envisage an increase of the luminosity up to 2.2 L with 7 TeV per proton beam, namely the high luminosity upgrade (HL-LHC) phase I.
In order to maintain the high level of accuracy and efficiency of the tracking in this new challenging condition, a CMS pixel detector upgrade phase I program has been set up. The main goals of the upgrade activity are the material budget reduction in the tracking volume and the increase of the number of hits associated to a charged track. This paper gives an overview of the upgrade project, describes the planned R\&D activities and focuses on the expected improvements of the new CMS pixel detector system
Czochralski silicon sensors: Status of development
No full textTracker systems based on silicon detectors are one of the possible choices for experiments at the future upgrade of the Large Hadron Collider (LHC) the Super-LHC (SLHC). Optimization of material and detector design are key factors to develop ultra radiation hard silicon devices. Most advanced research activity in this field identified Magnetic Czochralski (MCz) material as a candidate for the processing of such a detectors. This paper summarizes more relevant results achieved by the CERN RD50 and SMART INFN collaborations. Recent studies on test structures and micro-strip detectors processed on MCz material, n-type and p-type doped, and the radiation hardness performance after heavy irradiation tests are described. Charge collection from particles has been evaluated on diodes and micro-strip detectors and extrapolation of tracking performances up to the fluence expected at SLHC has been studied. Promising results in terms of radiation hardness parameters have been achieved. (c) 2007 Published by Elsevier B.V
DEVELOPMENT OF RADIATION HARD SENSORS FOR VERY HIGH LUMINOSITY COLLIDERS - CERN-RD50 PROJECT
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Design and Studies of Micro-Strip Stacked Module Prototypes for Tracking and Trigger at the SLHC
No full textPrototype silicon microstrip modules meant to generate Level 1 trigger information in future tracker implementations at super-high luminosity accelerators have been built using spare components from the current CMS Tracker and tested on a 120 GeV muon beam at the CERN SPS North Area. Tracking information from a silicon microstrip beam telescope has also been used in order to precisely reconstruct tracks and incidence angles. Data has been collected from prototypes with different geometries and interconnection schemes and at different angles of beam incidence, simulating the effect of a solenoidal magnetic field on particles of different transverse momentum p(perpendicular to)
Design and development of micro-strip stacked module prototypes for tracking at S-LHC
No full textExperience at high luminosity hadron collider experiments shows that tracking information enhances the trigger rejection capabilities while retaining high efficiency for interesting physics events [1]. The design of a tracking based trigger for Super LHC (S-LHC), the high luminosity upgrade of the LHC collider [2], is an extremely challenging task requiring the identification of high-momentum tracks as a part of the Level 1 trigger decision. Simulation studies show that this can be achieved by correlating hits on two closely spaced silicon strip sensors. This paper focuses on the design and development of micro-strip stacked prototype modules and their performance. The prototypes have been built with the silicon sensors and electronics used to equip the present CMS Tracker [3]. Correlation of signals collected from sensors are processed off detector. Preliminary results in terms of signal over noise and tracking performance with cosmic rays will be also shown
Characterization and simulation of CMS-type silicon microstrip detectors
No full textThis paper describes the expected performance for the single-sided silicon detectors of the barrel tracker of CMS. We present results obtained on;P-side test structures for different detector design geometries (strip pitch and width) and two readout schemes (every strip or every second strip). We show measurements on devices irradiated by fast neutrons, operated at very high bias voltage well above the depletion. We use an analytical model to evaluate the charge collection efficiency, noise, and signal-to-noise ratio in realistic experimental conditions
Concepts for a tracker trigger based on a multi-layer layout and on-detector data reduction using a cluster size approach
No full textOne of the proposed solutions for a transverse momentum (p(T)) based trigger at SLHC for the CMS experiment is based on the concept known as the "cluster width" approach, in which clusters produced by low pT tracks are rejected based on the width of the cluster shape, made either on a single strip sensor or a doublet of strip sensors by a suitable electronics logic at the level of the front- end. This information can then be used in many ways to provide first level trigger primitives. These kinds of modules are inexpensive, and coupled high-speed opto-electronic components this concept provides the simplest solution to the first level trigger for SLHC trackers. We will present the simulation studies aimed to optimize the concept, as well as the basic building blocks of the module and their connectivity. Finally we will provide the experimental validation of it by using data collected by the CMS Tracker during the Cosmic runs in 2008 and 2009 as well as the first collision data from the LHC
Improvement in breakdown characteristics with multiguard structures in microstrip silicon detectors for CMS
No full textTo obtain full charge collection the CMS silicon detectors should be able to operate at high bias voltage. We observed that multiguard structures enhance the breakdown performance of the devices on several tens of baby detectors designed for CMS. The beneficial effects of the multiguard structures still remains after the strong neutron irradiation performed to simulate the operation at the LHC. (C) 2001 Elsevier Science B.V. All rights reserved
Test results on heavily irradiated silicon detectors
No full textThe performance of silicon micro-strip detectors after heavy irradiation have been investigated using a muon beam. Large-area sensors have been irradiated with neutrons and protons, read-out with fast shaping time electronics, and operated at low temperature. The paper presents a study of the charge collection efficiency, signal-to-noise ratio and hit reconstruction: efficiency of these silicon devices
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