30TH INTERNATIONAL COSMIC RAY CONFERENCE The ANTARES detector: background sources and effects on detector performance S. ESCOFFIER1 ON BEHALF OF THE ANTARES COLLABORATION

Abstract: The ANTARES Collaboration is deploying a large neutrino detector at a depth of 2475 m in the Mediterranean Sea, 40 km off shore from La Seyne-sur-Mer in South France. The construction of this 12-line detector with 75 phototubes per line will be completed early 2008. Data taking has be-gun since April 2005 with an instrumentation line also equipped with optical modules. The first 5 de-tector lines are operational since January 2007. The telescope is aimed to observe high energy cosmic neutrinos through the detection of the Cerenkov light produced by up-going induced muons. Back-ground sources are due to atmospheric neutrinos as well as misreconstructed atmospheric muons. Ad-ditional backgrounds inherent to the sea water environment come from 40K decay and marine organ-isms ’ luminescence. While the contribution of the former is expected to be constant at a level of about 45 kHz, the bioluminescence has shown large time variations, with periods of very high activity, up to several hundred kHz. Description of these background sources will be reported, and effects on detec-tor performance will be described. Methods recently developed to improve the detection efficiency in high background periods will be described, together with some of the results obtained