Pascal Vernin

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Hanoi,Aug. 6-12, 2006

AntaresStatus reportAntaresStatus report

P.VerninP.VerninCEA Saclay, DapniaCEA Saclay, DapniaOn behalf of the Antares collaborationOn behalf of the Antares collaboration

P.VerninP.VerninCEA Saclay, DapniaCEA Saclay, DapniaOn behalf of the Antares collaborationOn behalf of the Antares collaboration

http://antares.in2p3.fr

Pascal Vernin

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Hanoi,Aug. 6-12, 2006 ANTARES Collaboration & detector site

21 Institutes from6 European countries

40 km submarine cable

-2500m

ANTARES shore station

Pascal Vernin

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Hanoi,Aug. 6-12, 2006 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

Pascal Vernin

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Hanoi,Aug. 6-12, 2006 ANTARES detection principleNeutrino detection principle

č

43°2500 mdepth

p

p,

interaction

Cherenkovlight from

3D PMT array

Measurement :Time, position & amplitude of hits

(~ ) trajectory

Pascal Vernin

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Hanoi,Aug. 6-12, 2006

The 12 string Antares Telescope

• 25 storeys / line• 3 PMTs / storey

• 900 PMTs

~70 m

350 m

100 m

14.5 m

Interlink cables

JunctionBox

40 km to shore

Anchor/line socket

Pascal Vernin

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Hanoi,Aug. 6-12, 2006

Hydrophone RX

Local Control Module (in the Ti-cylinder)

Optical Beacon

for timing calibration (blue LEDs)1/4 floors

17” glass sphere10” PMT Ham. R7081-2014 stages

Basic detector element: storey

Pascal Vernin

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Hanoi,Aug. 6-12, 2006 Expected performance

ANTARESANTARES

abs ~ 60 m (26 m) @ 470 nm (379 nm)

eff (scattering)~ 300 m (100 m) @ 470 nm (370 nm)

Pascal Vernin

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Hanoi,Aug. 6-12, 2006 ANTARES Construction Milestones

2001 – 2003:Main Electro-optical cable in 2001Junction Box in 2002Prototype Sector Line (PSL) &

Mini Instrumentation Line (MIL) 2003

2005MILOM

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 !

2006Line 1

Pascal Vernin

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Hanoi,Aug. 6-12, 2006

10

0m

50

m1

5m

15

m

Bottom String SocketBottom String Socket

Buoys

Acoustic Doppler Current Profiler

(ADCP) LEDbeacon

Storey 2Storey 2

3 Optical Modules Acoustic

PositioningTransducer

Storey 1Storey 1Storey 3Storey 3

Seismograph

Mini Instrumentation Line + OMs

Pascal Vernin

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Hanoi,Aug. 6-12, 2006

3 months

MILOM single counting rates

Burst-fraction:Time fraction when

rate > baseline + 20%

Baseline (40K+biolum.)

Bursts frombiolum.

2 mn

Pascal Vernin

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Hanoi,Aug. 6-12, 2006 Coincidence rates from 40K decays

Simulation: 12 Hz ± 4 Hz (sys)

40K coincidence rate from Gaussian fit:

13.0 ± 0.5 Hz 13.0 ± 0.5 Hz

10.5 ± 0.4 Hz

40K

40Ca

e-

γCherenkov

Pascal Vernin

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Hanoi,Aug. 6-12, 2006

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 signalsfrom 2 OMs in a storey (0.52 = 0.75 ns)

Pascal Vernin

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Hanoi,Aug. 6-12, 2006

Mozambique

Feb. 22, 2006

Lavandou (France)

Feb. 9, 2006

Real time seismic survey

Pascal Vernin

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Hanoi,Aug. 6-12, 2006 First complete detector Line

Feb 14th 2006

Pascal Vernin

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Hanoi,Aug. 6-12, 2006

Connection by submersible ROV Victor (Ifremer)

on March 2nd

First complete detector Line

Pascal Vernin

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Hanoi,Aug. 6-12, 2006 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

Pascal Vernin

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Hanoi,Aug. 6-12, 2006 Line 1 shapes (acoustic data)

AutonomousAutonomousTransponderTransponder

• Hydrophone

Low current speed High 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

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Hanoi,Aug. 6-12, 2006

μ

Reconstruction with 1 line (poor sensitivity to azimut ):

Altitude vs Time Hyperbola

Algorithm minimizes χ2 to find zenith angle of track

Atmospheric muon tracks

Run 21240 / Event 12505

Zenith θ = 101o

P(2,ndf) = 0.88

Antares preliminary

Hit time [ns]

Hit

alti

tud

e (

rela

tive

to

mid

de

tect

or)

[m

]

Triggered hits Hits used in fit Single hits+

Pascal Vernin

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Hanoi,Aug. 6-12, 2006

22753 / 3880 = 180o

t [ns]

z [m]

μ

Antares preliminary

Triggered hits Hits used in fit Single hits+

Atmospheric muon tracks

P(2,ndf) = 0.35

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Hanoi,Aug. 6-12, 2006 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 !