1. Hanoi, Aug. 6-12, 2006 Pascal Vernin 1 Antares Status report P.Vernin CEA Saclay, Dapnia On behalf of the Antares collaboration P.Vernin http://antares.in2p3.fr

2. Hanoi, Aug. 6-12, 2006 Pascal Vernin 2 ANTARES Collaboration & detector site 21 Institutes from 6 European countries 40 km submarine cable -2500m ANTARES shore station

3. Hanoi, Aug. 6-12, 2006 Pascal Vernin 3 ANTARES Scientific issues High energy neutrino astrophysics: Active Galactic Nuclei, Gamma Ray Bursts, Galactic Centre, SN Remnants,  -quasars... Search for New Physics: WIMPs annihilations, magnetic monopoles... Interdisciplinary Deep Sea Studies: oceanography, sea biology, seismology... Neutralino Annihilation Bioluminescent Organisms AGN SNR Binary systems Micro- quasars GRB

4. Hanoi, Aug. 6-12, 2006 Pascal Vernin 4 ANTARES detection principle Neutrino detection principle   43° 2500 m depth p    p,   interaction Cherenkov light from  3D PMT array Measurement : Time, position & amplitude of hits  (~ ) trajectory

5. Hanoi, Aug. 6-12, 2006 Pascal Vernin 5 The 12 string Antares Telescope 25 storeys / line 3 PMTs / storey 900 PMTs ~70 m 350 m 100 m 14.5 m Interlink cables Junction Box 40 km to shore Anchor/line socket

6. Hanoi, Aug. 6-12, 2006 Pascal Vernin 6 Hydrophone RX Local Control Module (in the Ti-cylinder) Optical Beacon for timing calibration (blue LEDs) 1/4 floors 17” glass sphere 10” PMT Ham. R7081-20 14 stages Basic detector element: storey

7. Hanoi, Aug. 6-12, 2006 Pascal Vernin 7 Expected performanceANTARES  abs ~ 60 m (26 m) @ 470 nm (379 nm) eff ( scattering )~ 300 m (100 m) @ 470 nm (370 nm)

8. Hanoi, Aug. 6-12, 2006 Pascal Vernin 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 MILOM 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 2006 – 2007:  Installation of remaining 10 lines  MILOM changed by Instrumentation Line 2007+: Physics with full detector ! 2006 Line 1

9. Hanoi, Aug. 6-12, 2006 Pascal Vernin 9 100m 50m 15m Bottom String Socket Buoys Acoustic Doppler Current Profiler (ADCP) LED beacon Storey 2 3 Optical Modules Acoustic Positioning Transducer Storey 1 Storey 3 Seismograph Mini Instrumentation Line + OMs

10. Hanoi, Aug. 6-12, 2006 Pascal Vernin 10 3 months MILOM single counting rates Burst-fraction: Time fraction when rate > baseline + 20% Baseline ( 40 K+biolum.) Bursts from biolum. 2 mn

11. Hanoi, Aug. 6-12, 2006 Pascal Vernin 11 Coincidence rates from 40 K decays Simulation: 12 Hz ± 4 Hz (sys) 40 K coincidence rate from Gaussian fit: 13.0 ± 0.5 Hz 10.5 ± 0.4 Hz 40 K 40 Ca e-e- γ Cherenkov

12. Hanoi, Aug. 6-12, 2006 Pascal Vernin 12 3 OMs 36 LEDs + reference PMT LED Beacon measurements of OM timing resolution Time of signal in OMs relative to reference PMT Time difference between signals from 2 OMs in a storey (0.5  2 = 0.75 ns)

13. Hanoi, Aug. 6-12, 2006 Pascal Vernin 13 Mozambique Feb. 22, 2006 Lavandou (France) Feb. 9, 2006 Real time seismic survey

14. Hanoi, Aug. 6-12, 2006 Pascal Vernin 14 First complete detector Line Feb 14 th 2006

15. Hanoi, Aug. 6-12, 2006 Pascal Vernin 15 Connection by submersible ROV Victor (Ifremer) on March 2 nd First complete detector Line

16. Hanoi, Aug. 6-12, 2006 Pascal Vernin 16 Time calibration with MILOM LEDs MILOM ~70 m ~150 m  = 0.7 ns  = 2.6 ns  t [ns] "horizontal" "diagonal" larger distance less intensity light scattering Line 1 All timing measurements in good agreement with expectations

17. Hanoi, Aug. 6-12, 2006 Pascal Vernin 17 Line 1 shapes (acoustic data) Autonomous Transponder Hydrophone Low current speedHigh current speed Current speeds : 4, 12, 15, 26, 32, 33 cm.s -1 Acoustic distance measurement of hydrophones from fixed emitters on MILOM anchor + autonomous transponders 2 weeks 50cm Horizontal displacement of lowest hydrophone

18. Hanoi, Aug. 6-12, 2006 Pascal Vernin 18 μ Reconstruction with 1 line (poor sensitivity to azimut ): Altitude vs Time Hyperbola Algorithm minimizes χ 2 to find zenith angle of track Atmospheric muon tracks  Run 21240 / Event 12505  Zenith θ = 101 o  P(  2,ndf) = 0.88 Antares preliminary Hit time [ns] Hit altitude (relative to mid detector) [m]  Triggered hits  Hits used in fit  Single hits +

19. Hanoi, Aug. 6-12, 2006 Pascal Vernin 19  22753 / 3880   = 180 o t [ns] z [m] μ Antares preliminary  Triggered hits  Hits used in fit  Single hits + Atmospheric muon tracks  P(  2,ndf) = 0.35

20. Hanoi, Aug. 6-12, 2006 Pascal Vernin 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 KM 3 underwater detector Stay tuned for the first undersea neutrino !