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Antares Status report

http://antares.in2p3.fr. Antares Status report. P.Vernin CEA Saclay, Dapnia On behalf of the Antares collaboration. ANTARES shore station. 40 km submarine cable. 21 Institutes from 6 European countries. -2500m. ANTARES Collaboration & detector site. Binary systems. Micro-quasars.

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Antares Status report

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  1. http://antares.in2p3.fr AntaresStatus report P.Vernin CEA Saclay, DapniaOn behalf of the Antares collaboration

  2. ANTARES shore station 40 km submarine cable 21 Institutes from6 European countries -2500m ANTARES Collaboration & detector site

  3. Binary systems Micro-quasars Neutralino Annihilation ANTARES Scientific issues SNR GRB • High energy neutrino astrophysics:Active Galactic Nuclei, Gamma Ray Bursts, Galactic Centre, SN Remnants, m-quasars... • Search for New Physics: WIMPs annihilations, magnetic monopoles... • Interdisciplinary Deep Sea Studies: oceanography,seabiology, seismology... AGN Bioluminescent Organisms

  4. Neutrino detection principle m (~ n) trajectory ANTARES detection principle 3D PMT array nm p, a p m Cherenkov light from m gč nm g 43° 2500 m depth Measurement : Time, position & amplitude of hits m interaction n

  5. ~70 m The 12 string Antares Telescope • 25 storeys / line • 3 PMTs / storey • 900 PMTs 350 m 14.5 m 40 km to shore 100 m Junction Box Interlink cables Anchor/line socket

  6. Basic detector element: storey Optical Beacon for timing calibration (blue LEDs) 1/4 floors 17” glass sphere 10” PMT Ham. R7081-20 14 stages Local Control Module (in the Ti-cylinder) Hydrophone RX

  7. m n ANTARES Expected performance labs ~ 60 m (26 m) @ 470 nm (379 nm) leff (scattering)~ 300 m (100 m) @ 470 nm (370 nm)

  8. ANTARES Construction Milestones 2001 – 2003: • Main Electro-optical cable in 2001 • Junction Box in 2002 • Prototype Sector Line (PSL) & Mini Instrumentation Line (MIL) 2003 • 2005 – Now: • Mini Instrumentation Line + OMs (MILOM)running since 12 April 2005 • Line 1 running since March 2006,first complete detector line • Line 2 deployed since July 2006, waiting for connection • Line 3 under construction since July 2006 2006Line 1 2005MILOM • 2006 – 2007: • Installation of remaining 10 lines • MILOM changed by Instrumentation Line • 2007+: Physics with full detector !

  9. Mini Instrumentation Line + OMs Acoustic Doppler Current Profiler (ADCP) 3 Optical Modules Buoys Acoustic Positioning Transducer LEDbeacon 15m Seismograph 50m 15m 100m Storey 3 Storey 2 Storey 1 Bottom String Socket

  10. 3 months Bursts frombiolum. Baseline (40K+biolum.) 2 mn MILOM single counting rates Burst-fraction:Time fraction whenrate > baseline + 20%

  11. 10.5 ± 0.4 Hz 40K coincidence rate from Gaussian fit: 13.0 ± 0.5 Hz 13.0 ± 0.5 Hz e- 40Ca γCherenkov 40K Coincidence rates from 40K decays Simulation: 12 Hz ± 4 Hz (sys)

  12. LED Beacon measurements of OM timing resolution Time of signal in OMs relative to reference PMT 3 OMs Time difference between signals from 2 OMs in a storey (0.52 = 0.75 ns) 36 LEDs + reference PMT

  13. Real time seismic survey Lavandou (France) Feb. 9, 2006 Mozambique Feb. 22, 2006

  14. First complete detector Line Feb 14th 2006

  15. First complete detector Line Connection by submersible ROV Victor (Ifremer) on March 2nd

  16. s = 2.6 ns • "diagonal" • larger distance • less intensity • light scattering s = 0.7 ns "horizontal" Dt [ns] Time calibration with MILOM LEDs Line 1 All timing measurements in good agreement with expectations ~150 m ~70 m MILOM

  17. Horizontal displacement of lowest hydrophone 50cm Current speeds :4 , 12 , 15 , 26 , 32 , 33 cm.s-1 Acoustic distance measurement of hydrophones from fixed emitters on MILOM anchor + autonomous transponders Low current speed High current speed 2 weeks Line 1 shapes (acoustic data) • Hydrophone AutonomousTransponder

  18. Atmospheric muon tracks • Run 21240 / Event 12505 • Zenith θ= 101o • P(c2,ndf) = 0.88 • Triggered hits • Hits used in fit • Single hits + Reconstruction with 1 line (poor sensitivity to azimut ): Altitude vs Time Hyperbola Algorithm minimizes χ2to find zenith angle of track Antarespreliminary μ Hit altitude (relative to mid detector) [m] Hit time [ns]

  19. Atmospheric muon tracks • Triggered hits • Hits used in fit • Single hits + Antarespreliminary • 22753 / 3880 • q= 180o z [m] • P(c2,ndf) = 0.35 μ t [ns]

  20. Conclusions and Outlook • Major step forward during the last year • Detector working well within design specifications: • Junction Box in operation since Dec. 2002 • Two lines delivering data on the site • All technical problems solved • 12 lines detector complete end 2007 : Operation for science  5 years • Milestone towards a KM3 underwater detector Stay tuned for the first undersea neutrino !

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