CERN Accelerating science

ATLAS Note
Report number	ATL-INDET-PUB-2008-005 ; ATL-INDET-INT-2005-007 ; ATL-COM-INDET-2005-013 ; CERN-ATL-COM-INDET-2005-013
Title	Test beam measurement of the detection efficiency of ATLAS Pixel production modules
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 ; Massmann, 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	17 Jun 2005
Number of pages	19
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS CERN SPS
Test beam	H8
Free keywords	Pixel ; Silicon ; Detector ; Radiation Hardness ; Test Beam ; LHC
Abstract	Beam tests of ATLAS Pixel Detector production modules were performed with a pion beam at the SPS H8 test beam facility. Several of the modules had been previously irradiated with protons to a fluence of 2 * 10**15 p/cm2, corresponding to 10**15 neq/cm2. This note presents measurements of detection efficiency performed in 2004 on one not irradiated and seven irradiated modules. The efficiency was studied as a function of the operating bias voltage and for different incidence angles. The unirradiated module has an extremely good detection efficiency. A value of 99.9 % was measured at normal incidence. Irradiated detectors have an average efficiency of 97.8 % at the standard operating bias voltage of 600 V. The timing uniformity across the different types of pixel cells (standard, long and ganged pixels) and between the sixteen front-end readout chips was also studied and found to be better than 2 ns. The effects of hit duplication on the detection efficiency, the spatial resolution and the pixel occupancy were also studied.
Copyright/License	Preprint: (License: CC-BY-4.0)

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