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Status report on the Antares Project

Status report on the Antares Project. http://antares.in2p3.fr. Bertrand Vallage – DSM/Dapnia/CEA-Saclay on behalf of the ANTARES Collaboration. 10th International Conference on Topics in Astrophysics and Underground Physics Sendai, Japan, 11-15 September 2007. ANTARES shore station.

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Status report on the Antares Project

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  1. Status report on the Antares Project http://antares.in2p3.fr Bertrand Vallage – DSM/Dapnia/CEA-Saclay on behalf of the ANTARES Collaboration 10th International Conference on Topics in Astrophysics and Underground Physics Sendai, Japan, 11-15 September 2007

  2. ANTARES shore station 40 km submarine cable 23 Institutes from7 European countries -2475m ANTARES collaboration and location 42°50’ N 6°10’E

  3. Neutrino telescope: Detection principle 3D PMTarray p, a 107  atm  104  atm p m Cherenkov light from m gč  1-100  cosm g 43° Sea floor m interaction Reconstruction of m trajectory(~ n)from timing and position of PMT hits n

  4. Detector layout Horizontal layout a storey 12 lines (900 PMTs) 25 storeys / line 3 PMTs/storey 14.5 m 350 m 40 km to shore 100 m Junction box ~70 m Readout cables Sea bed ~ -2500 m

  5. Optical Module:10” PMTin17” glass sphere photon detection Local Control Module(in Ti container): Front-end ASIC, Clock, DAQ/SC,compass/roll/pitch Basic detection and calibration elements Optical Beaconwith blue LEDs: Timing calibration (4 per line) Hydrophone: acoustic positioning (5RX + 1RXTX/line)

  6. Detector line deployment

  7. Submarine detector line connection

  8. Submarine detector line connection

  9. L3 L2 L1 L5 L4 L8 L7 L6 L10 L9 L11 L12 9+1 lines in sea, 5 in operation (Sept. 2007) seismometer N 42°50’ N 6°10’E IL07 5 lines detector (since January 29th) Submarine cable to shore 100 m Junction box

  10. Trigger and DAQ L0: PMT hit above 1/3 PE • PSD: • “SPE” • “Complex” • “Analog Ring Sampler” provides digitized integrated charge,time,timestamp: 6 Bytes • For high amplitude or high duration hits (~2%), possible to record full waveform: 272 Bytes Oscilloscope mode on double pulse • “ALL DATA TO SHORE” SCHEME: • each Optical Module provides at least 60 kHz of data ! (40K & biolum) • all data transmitted through multiplexed gigabit links: 200Mb-1Gb/s/line L1: coincidence at the storey level: 2 LO from 2 OMs out of 3 L2: - 3D trigger: 5 * (L1 or “large amplitude L0”), about 1 Hz - Min Bias, 40K, directional (GC), … : a few Hz + GRB alert (Swift)

  11. bursts baseline Optical background Baseline: 40K decays + bacteria luminescence Bioluminescencebursts: Animal species which emit light by flashes, spontaneous or stimulated around the detector.

  12. 40K decays MC expectation: • 40K single rate about 40 kHz (10” PMT) • coincidence rate: 13 ± 4 Hz Measurement from data: g 14.5 ± 0.4 Hz Cherenkov g e- (b decay) 40K 40Ca Monitor relative PMT efficiencies Check timing within a storey

  13. Connection Line 1 Connection Line 2 Connections Line3,4&5 Baseline variations 2005-2007 Instrumented Line date in 2005 Fraction of time above mean rate

  14. k qc ℓ  t0, , f, x, y, z m 3D Event reconstruction One of the very first “5 lines detector” events, Jan 29th 2007: 5 parameters fit by 2 minimization

  15. up going down going Expected HE muon flux in ANTARES Zenith angle

  16. up going down going First glimpse analysis Reconstructed Nadir angle after cut (straight lines): Very preliminary • Sample of reconstructed events (4.35 M from February to April) • Quality cut for upgoing tracks • No alignment used number of events Neutrino candidates cos 

  17. Event displays • Hits are plotted for each line: height(m) vs time(ns) • Characteristic pattern in function of zenith angle and point of closest approach between line and track: e.g for cda @ storey 13 (Z=0m) down going up going

  18. Atmospheric muon bundle on 5 lines ?

  19. Neutrino candidate (1) =55o

  20. Neutrino candidate (2) =35o

  21. Hydrophone AutonomousTransponder Calibration: detectorpositioning Acoustic distance measurement of hydrophones from fixed emitters on line anchors + autonomous transponders Line shape determined every 6 minutes from acoustic positioning + compass/roll/pitch slow control data hydrophones storey positions fit

  22. "diagonal" • larger distance • less intensity • light scattering s = 2.6 ns s = 0.7 ns "horizontal" Tmeas - Texp [ns] Time calibration: LED beacons Line 1 Timing measurements performed once a week confirm the expected time resolution ~150 m Line2 ~70 m

  23. Summary • 3D ANTARES detector operational with 5 lines; 4 extra lines in the sea waiting to be connected, 12 lines detector completed early 2008 • Several millions of down going events available to study detector behavior in various bioluminescence conditions • First underwater neutrino candidates reconstructed in the Mediterranean sea • Position and time calibration in progress to reach the nominal detector resolution • MC comparison ongoing, physics results expected soon

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