Position Resolution for the CMS Barrel Pixel Detector after Irradiation

✍ Scribed by E. Alagöz; C. Amsler; V. Chiochia; S. Dambach; C. Eggel; W. Erdmann; D. Kotlinski; U. Langenegger; B. Meier; J. Rochet; T. Rohe; T. Rommerskirchen; A. Starodumov; M. Swartz; P. Trüb

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 627 KB
• Volume: 197
• Category: Article
• ISSN: 0920-5632
• DOI: 10.1016/j.nuclphysbps.2009.10.062

✦ Synopsis

The CMS barrel pixel detector is the innermost tracking device, reconstructing the interaction vertices and charged particle trajectories. At the LHC design luminosity, 10 34 cm -2 s -1 , there will be 1000 charged particles per bunch crossing every 25 ns. In the innermost layer the pixel sensors will be exposed to a fluence of 3 × 10 14 neq/cm 2 /yr with consequent degradation of the silicon lattice structure and particle detection performances. Beam tests of irradiated pixel sensors were performed at CERN with the final front end electronics in a 3T magnetic field. We present the measurements of charge collection and radiation hardness, as well as spatial resolution.