CERN Accelerating science

Internal Note and Article
Report number	ATL-GEN-PROC-2009-009 ; ATL-COM-GEN-2009-030
Title	Readiness of the ATLAS detector : performance with the first beam and cosmic data
Author(s)	Pastore, F (CERN)
Collaboration	on behalf of the ATLAS Collaboration
Publication	2010
Imprint	12 Jun 2009
Number of pages	4
Note	conference deadline is over, but I'm requesting an extension. Thus this request is quite urgent.
In:	Nucl. Instrum. Methods Phys. Res., A 617 (2010) 48-51
In:	11th Pisa Meeting on Advanced Detectors on Frontier Detectors For Frontier Physics, La Biodola, Italy, 24 - 30 May 2009, pp.48-51
DOI	10.1016/j.nima.2009.08.068
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	commissioning, first beam, cosmic results
Abstract	During 2008 the ATLAS experiment went through an intense period of preparation to have the detector fully commissioned for the first beam period. In the about 30 hours of beam time available to ATLAS in 2008, the systems went through a rapid setup sequence, from successfully recording the first ever bunch reaching ATLAS, to setting up the timing of the trigger system synchronous to the incoming single beams. So-called splash events were recorded, were the beam is stopped on a collimator 140 m upstream of ATLAS, showering the experiment with millions of particles per beam shot. These events were found to be extremely useful for timing setups. After the stop of beam operation , the experiment went through an extensive cosmic ray data taking campaign, resulting in more than 200 million cosmic ray events recorded. These events have since been used to make significant progress on the calibration and alignment of the detector. This paper describes the commissioning programme and the results obtained from both the single beam data and the cosmic data recorded in 2008 and early 2009.

Corresponding record in: Inspire
Email contact: francesca.pastore@cern.ch