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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: 1.32). 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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