6,716 research outputs found
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
CMS Silicon Strip Tracker Operation and Performance
No full textThe Silicon Strip Tracker (SST) of the CMS experiment is, with 9.6 million readout channels, the largest strip tracker ever built. In order to correctly interpret and reconstruct the events recorded it needs to be precisely calibrated, thus ensuring that it fully contributes to the physics research program of the CMS experiment. In 2009 and 2010, the performance of the SST has been carefully studied using cosmic muons and tracks from proton-proton collisions at centre-of-mass energies of 900 GeV, 2.36 TeV and 7 TeV. In this paper, we present some results of the detector performance
The CMS Tracker End-Caps integration
No full textInternational audienceThe two CMS Tracker End-Caps (TECs) consist of nine disks each, totalling 6400 silicon modules mounted on 288 intermediate sub-structures: the “petals”, a carbon fiber plated honeycomb support which carries up to 28 modules arranged in seven radial rings. One of the TECs has been integrated at CERN by IPN Lyon, while the second one was assembled in RWTH-Aachen I. This contribution describes in detail the integration procedures, including: the qualification of petals before insertion, the sector by sector (18 petals) mechanical integration inside the TEC structure and the commissioning at room temperature and in the cold at -20ring operator. The problems encountered during the whole assembly procedure and their solutions will be reported as well as the final performance of the two TECs. Both are now integrated in the CMS Tracker tube together with the Inner and Outer Barrel part. We will show the noise performance obtained under these conditions
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