hanoi, aug. 6-12, 2006 pascal vernin 1 antares status report p.vernin cea saclay, dapnia on behalf...
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Pascal Vernin
1
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
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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
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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
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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)
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Hanoi,Aug. 6-12, 2006
Mozambique
Feb. 22, 2006
Lavandou (France)
Feb. 9, 2006
Real time seismic survey
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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
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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+
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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
Pascal Vernin
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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 !
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