Design and performance of the silicon sensors for the CMS barrel pixel detector

Physik Institut der Universität Zürich-Irchel, 8057 Zürich, Switzerland; Purdue University, West Lafayette, IN 47907, USA; University of Mississippi, University, MS 38677, USA; Institut für Physik der Universität Basel, 4056 Basel, Switzerland; Johns Hopkins University, Baltimore, MD 21218, USA; Institute of Experimental Physics, University of Warsaw, Warsaw, Poland; Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment (Impact Factor: 1.14). 03/2007; DOI:10.1016/j.nima.2007.08.151
Source: arXiv

ABSTRACT The CMS experiment at the (LHC) includes a hybrid silicon pixel detector for the reconstruction of charged tracks and of the interaction vertices. The barrel region consists of n-in-n sensors with cell size processed on diffusion oxygenated float zone silicon. A biasing grid is implemented and pixel isolation is achieved with the moderated p-spray technique. An extensive test program was carried out on the H2 beam line of the CERN-SPS. In this paper we describe the sensor layout, the beam test setup and the results obtained with both irradiated and non-irradiated prototype devices. Measurements of charge collection, hit detection efficiency, Lorentz angle and spatial resolution are presented.

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    ABSTRACT: The CMS inner pixel detector system is planned to be replaced during the first phase of the LHC luminosity upgrade. The plans foresee an ultra low mass system with four barrel layers and three disks on either end. With the expected increase in particle rates, the electronic readout chain will be changed for fast digital signals. An overview of the envisaged design options for the upgraded CMS pixel detector is given, as well as estimates of the tracking and vertexing performance.
    Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment - NUCL INSTRUM METH PHYS RES A. 04/2011; 658(1).
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    ABSTRACT: For any position sensitive detector (PSD) the crucial characteristic for using as tracking or imaging detector is the accuracy of coordinate determination. Position resolution of PSD is closely connected not only with energy resolutions of spatially distributed sensors, but also with correlations between sensors' signal fluctuations. In this paper, the general relation between the position resolution of PSD and sensors' energy resolutions, which accounts for correlations between fluctuations, was derived. Using this general relation, the mean square deviation of reconstructed particle coordinate for PSD with two and three outputs were obtained. Experimental calibration data and a rather simple procedure of data processing based on derived formulae allow, without any technical improvement of position sensitive detector, significantly improve its position resolution.
    Journal of Instrumentation 01/2012; 7(06). · 1.66 Impact Factor

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