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

Published in:

Nuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment 584,1 (2008) 25-41;


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 100 x 150 mu m(2) 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 H-2 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. (c) 2007 Elsevier B.V. All rights reserved.


pixel;; silicon;; sensors;; CMS;; LHC;; radiation hardness;; Instruments & Instrumentation;; Nuclear Science & Technology;; Physics, ;; Particles & Fields;; Spectroscopy

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