CERN Accelerating science

ATLAS Note
Report number	ATL-INDET-PUB-2008-004 ; ATL-INDET-INT-2005-006 ; ATL-COM-INDET-2005-012 ; CERN-ATL-COM-INDET-2005-012
Title	Analysis of test beam data of ATLAS Pixel Detector production modules with a high intensity pion beam.
Author(s)	Alimonti, G ; Andreazza, A ; Bazalova, M ; Beccherle, R ; Breugnon, P ; Brüser, D ; Cauz, D ; Clemens, J C ; Cobal-Grassman, M ; Dobos, D ; Einsweiler, Kevin F ; Flick, T ; Gagliardi, G ; Gemme, C ; Gerlach, P ; Gorelov, I ; Grosse-Knetter, J ; Hügging, F G ; Imhauser, M ; Kersten, S ; Klingenberg, R ; Kuhn, M ; Lari, T ; Martínez, G ; Mass, M ; Massman, F ; Matera, A ; Mathes, M ; Meroni, C ; Morettini, P ; Naumov, D ; Netchaeva, P ; Ragusa, F ; Richardson, J ; Rossi, L ; Rozanov, A ; Santi, L ; Schiavi, C ; Schultes, J ; Sícho, P ; Stahl, T ; Ta, D B ; Tieman, D ; Tomasek, L ; Troncon, C ; Vahsen, S ; Valenta, J ; Virzi, J ; Vrba, V ; Weingarten, J
Publication	2005
Imprint	14 Apr 2005
Number of pages	18
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS CERN SPS
Test beam	H8
Free keywords	Pixel ; Silicon ; High-intensity ; Testbeam ; radiation hardness ; LHC
Abstract	Beam tests of ATLAS Pixel Detector production modules were performed with a high intensity pion bion at the SPS H8 test beam facility. Several of the modules had been previously irradiated to the fluence of 10**15 neq/cm2. Data were taken at different beam intensities, up to the value foreseen for the innermost pixel layer at the design LHC luminosity of 10**34/cm2/s. At each intensity, data were taken with different configurations of the front-end chip. This note describes the analysis of the high intensity run of August 2004. The particles trajectories were reconstructed using the pixel detectors under test and the detection efficiency was measured as a function of the beam intensity. With the standard ATLAS b-layer configuration and at the B-layer expected column-pair hit occupancy of 0.17 pixel hits per bunch crossing, the measured readout efficiency is 98 %, which is the same value found at low intensity. Efficiency losses are observed only when the column pair occupancy exceeds 0.24 hits per bunch crossing.
Copyright/License	Preprint: (License: CC-BY-4.0)

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