CERN Accelerating science

ATLAS Note
Report number	ATL-DAQ-PROC-2010-035
Title	Detailed Performance Study of ATLAS Endcap Muon Trigger with Beam Collision
Author(s)	Hayakawa, T (Kobe U.)
Collaboration	on behalf of ATLAS Collaboration
Publication	2010
Imprint	15 Oct 2010
Number of pages	5
In:	JINST 5 (2010) C11010
In:	Topical Workshop on Electronics for Particle Physics 2010, Aachen, Germany, 20 - 24 Sep 2010, pp.C11010
DOI	10.1088/1748-0221/5/11/C11010
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	LHC ; ATLAS ; TGC ; TDAQ ; TRIGGER
Abstract	Since the first p-p collision of the LHC, The Trigger System has been providing level-1 trigger signals of muon candidates with the specified latency to the central trigger system. The timing calibration is a vital issue to identify the bunch crossing number, which contains the high-momentum muon objects. To determine the bunch crossing identification number correctly, the signal delay parameters of all the 320k channels are aligned and the timing for opening the gate is adjusted to the fastest signal according to the result of a clock phase scan with a precision of 1nsec. After the timing calibration and the optimization of trigger conditions, the trigger efficiency is measured as 93.6% at the plateau region using the muon tracks originating from beam collisions. In this paper, we report on detailed studies about trigger efficiencies, optimization of coincidence windows and adjustment of gate timing based on the experience of the data acquisition of several months.
Copyright/License	Publication: (License: CC-BY-3.0)

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