S. E. Tzamarias

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S. E. Tzamarias Hellenic Open University
Neutrino Extended Submarine Telescope with
Oceanographic Research Status Report 2003 RUN
Electronics DAQ Data Analysis
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                    Germany
Institute of Geophysics  University of Hamburg
Institute of Experimental and Applied
PhysicsCenter of Applied Marine
SciencesResearch and Technology Center
West-Kueste (FTZ Buesum)  University of Kiel
           Greece
Physics Dept. University of AthensInstitute for
GeodynamicsAthens Observatory  Physics
Dept.  University of CreteInstitute for
Informatics and TelecommunicationsNCRS
DEMOKRITOSNational Science FoundationSchool of
Science Technology Hellenic Open
University NESTOR Institute for Deep Sea
Research, Technology and Neutrino Astroparticle
PhysicsPhysics and Astronomy Dept.University of
Patras

Physics Dept.


University of Thessaloniki
Experimental Design Bureau of Oceanological
Engineering Institute For Nuclear
ResearchRussian Academy of Sciences
                    Russia
Physics Dept.University of Bern   CERN
          Switzerland
Dept. of Physics and Astronomy University of
HawaiiLawrence Berkeley National Laboratory
          U.S.A.
 
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NESTOR (NEUTRINO EXTENDED SUBMARINE TELESCOPE
WITH OCEANOGRAPHIC RESEARCH) G.
Stavrakakis Institute for Geodynamics, Athens
Observatory E. G. Anassontzis, A.
Manousakis-Katsikakis, L. K. Resvanis, G.
Voulgaris A. Aloupis, J. Kontaxis, S. Nounos, P.
Preve Physics Dept., University of Athens P.
Grieder, P. Minkowsky, M. Passera Physics Dept,
University of Bern A. Ball CERN G. Grammatikakis,
J. Gialas PhysicsDept., University of Crete P.
Katrivanos Institute of Informatics and
Telecommunications, NCSR DEMOKRITOS D.
Korostylev, J. Makris, O. Vasiliev,
N.Zjabko Institute for Geophysics, University of
Hamburg J. G. Learned, S. Matsuno, R. Mitiguy, M.
Rosen Dept. of Physics and Astronomy,University
of Hawaii E. Fahrun, G. Green, U. Keussen, Th.
Knutz, P. Koske, J. Rathlev, Th. Schmidt, D.
Eilstrup, J. Mielke, N. Schmidt, W.
Voigt Institute of Experimental and Applied
Physics, Center for Applied Marine Sciences
Research and Technology Center West Kueste ( FTZ
Buesum) University of Kiel W. Chinowsky, J.
Ludvig, D. Nygren, G. Przybylski, J. Sopher, R.
Stokstad Lawrence Berkeley National Laboratory I.
Siotis National Science Foundation, Greece E.
Markopoulos, K. Papageorgiou, L.K. Resvanis, T.
Staveris, V. Tsagli, A. Tsirigotis N. Arvanitis,
A. Babalis, A. Darsaklis, J. Kiskiras, G.
Limberopoulos, Th. Michos, J. Tsirmpas, A.
VougioukasNESTOR Institute for Deep Sea
Research, Technology and Neutrino Astroparticle
PhysicsP.E. Christopoulos, Ch. Goudis, C.
PolitisPhysics and Astronomy Dept., University
of Patras G. Bourlis, E. Christopoulou, A.
Leisos, E. Pierri, N. Spanos, S. TzamariasSchool
of Science and Technology, Hellenic Open
University V.V. Ledenev O. Vaskine, K.
Komlev Experimental Design Bureau of
Oceanological Engineering A.V. Butkevich, L.G.
Dedenco, S.K. Karaevsky, A. Mironovich, N.M,
Surin, I.M. Zheleznykh, V. A.Zhukov L.M.
Zacharov, A. Shnyrev Institute For Nuclear
Research Russian Academy of Sciences
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The NESTOR Neutrino Telescope Site
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• Site characteristics
• a broad plateau 8x9 km2 in area, 7.5 nautical
  miles from shore
• depth 4000m
• transmission length 55 10m at ?460 nm
• underwater currents lt10 cm/sec
  measured over the last 10 years
• optical background 50 kHz/OM due to K40 decay,
  bioluminescence activity
  (1 of the experiment live time)
• sedimentology tests flat clay surface on sea
  floor good
  anchoring ground.

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NESTOR TOWER
32 m diameter 30 m between floors
144 PMTs
20 000 m2 Effective Area for Egt10TeV
Energy threshold as low as 4 GeV
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The Detector
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ReadOut Electronics DAQ Chain
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Ti-Sphere Electronics
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The Real GameJune 2000
ElectroOptical cable to shore (18 fibers 1
conductor) Deployed in June 2000 by the cableship
MAERSK-FIGHTER (ALCATEL- TELEDANMARK) Cable was
damaged during laying because of ships problems.
ALCATEL accepted responsibility and will repair
the cable. Cable landing has been completed and
first three km have been buried 2 m inside the
bottom sand. Methoni counting room is fully
operational.
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The Real GameJanuary 2002
ElectroOptical cable to shore (18 fibers 1
conductor) Cable repaired in January 2002
by the cableship TENEO (TyCom) Successful
deployment of the anchor unit with environmental
sensors to 4000m
A NESTOR floor deployment was postponed
due to the bad weather conditions
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Typical Current meter Data
transmitted in
Real Time from the NESTOR site (4000m depth)
through the 35km electrooptical
cable
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2003
Successful deployment of one NESTOR star with 12
Optical Modules to 4000m using the cableship
RAYMOND CROZE (FranceTelecom) 29th of March
The first deep sea muon data transmitted
to shore
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Ti-Sphere Electronics
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Floor Board ? PMT
pulse sensing ?
Majority logic event triggering ? Single
coincidence rate scaling ? Waveform
capture digitization ? Data formatting
transmission ? FPGA PLD reprogramming
PMT Signal Capture Digitization
5 ATWDs
Trigger Logic Communication FPGAs
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The LED Calibration System
Frequency Duration Light amplitude

• Gain monitoring
• Timing
• Free running Calibration Trigger
• Adjustable Trigger frequency
• Adjustable LEDs light output

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Extensive Lab tests On single p.e. conditions
Detector Preparation Optical Modules
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Angle (Degrees)
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Detector Preparation Attenuation Correction
Reference waveform
Electronic delay lines and amplifier
Coaxial cable
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DAQ Architecture
to the floor board
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Online Software
Shore Board

? Downloads the FPGAs PLD of the
Floor Board ? Broadcasts the
40Mhz clock
? Receives Data from the Floor
Board ?
Transmits Data to the Run Control System



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Real Time Monitor

• Environmental
• Thermometers
• Hygrometers
• Compass
• Inclinometer/Accelerometer
• Pressure meter
• Electrical
• PMT High Voltage etc
• Digitization DAQ Performance
• Digitized waveforms
• PMT rates
• Trigger rates
• DAQ status

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Real Time Monitors
Sample
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During deployment
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Data from a depth of 4000 m Single PMT Rates
Trigger 4fold Coincidence
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Data from a depth of 4000 m PMT Rates vs Time
Up-Looking PMTs
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Data from a depth of 4000 m PMT Rates vs Time
Down-Looking PMTs
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Data from a depth of 4000 m Number of Collected
P.E.s
During Bioluminescence Activity Bioluminescence
Activity Excluded
Trigger 4fold Coincidence
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Data from a depth of 4000 m Total Number of P.E.s
Inside the Trigger Window
During Bioluminescence Activity Bioluminescence
Activity Excluded
Trigger 4fold Coincidence
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Data from a depth of 4000 m Bioluminescence
Contribution to the Total Trigger Rates
Bioluminescence Occurs for the 1.1 0.1 of
the Active Experimental Time
Total Trigger Rates Bioluminescence Contribution
to the Total Trigger Rates Experimental Trigger
Rates from Periods Without Bioluminescence
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Data from a depth of 4000 m Total Number of P.E.s
Inside the Trigger Window
During Bioluminescence Activity Bioluminescence
Activity Excluded
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Data Analysis Flow
Raw Data
Interface
Waveform Reconstruction
Data Quality Histograms
Hit Definition
Software Monitor Histograms
Database (gains,
baselines,attenuation etc)
DST Production
Track Reconstruction
Calibration Data Analysis
MiniDST Ntuples Histograms
Calibration Database Quality Histograms
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Waveform Reconstruction
Offset (ADC counts)
Sample Offset (ADC counts)
Sample
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Event by Event Sampling Interval Variation
(Constant Temperature)
RMS0.006 ns
40 MHz Clock Waveform Capture
Software to Hardware Trigger Time Difference
(arbitrary time offset)
ADC Counts
s0.7ns
Sample
Time (ns)
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Data from a depth of 4000 m PMT Pulse Height
Distribution
Calibration
single p.e. LED Run
single p.e. pulse height distribution two p.e.s
pulse height distribution dark current pulse
height distribution sum of the above
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Data from a depth of 4000 m Calibration Run
Calibration Data Analysis
Calibration Database Quality Histograms
LED Calibration Data Gain Monitors
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Data from a depth of 4000 m Trigger
Studies Preliminary
Data Collected with 4fold Majority
Trigger Thresholds at 30mV (1/4 P.E.)
Experimental Points M.C. Estimation (Atmospheric
muons K40 )
Trigger Rate (Hz)
Coincidence Level
Total Charge inside the Trigger Window
Coincidence Level
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Data from a depth of 4000 m Trigger
Studies Preliminary
Data Collected with 4fold Majority
Trigger Thresholds at 120mV (1 P.E.)
Experimental Points M.C. Estimation (Atmospheric
muons K40 )
Trigger Rate (Hz)
Coincidence Level
Total Charge inside the Trigger Window
Coincidence Level
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Data from a depth of 4000 m Trigger
Studies Preliminary
Data Collected with 4fold Majority Coincidence
Trigger
Experimental Points M.C. Estimation (Atmospheric
muons K40 )
Thresholds at 30mV (1/4 P.E.)
Thresholds at 30 mV Thresholds at 120 mV
Measured Total Trigger Rates (greater or equal to 4fold) 2.61 0.02 Hz 0.12 0.01 Hz
M.C. Prediction (atmospheric muons only) 0.141 0.005 Hz 0.12 0.01 Hz
Trigger Rate (Hz)
Coincidence Level
Thresholds at 120mV (1 P.E.)
Trigger Rate (Hz)
Coincidence Level
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Input to the Fitter
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The Problem . . .
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Event 204 Run 91 BFile 1 Topology
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Event 204 Run 91 BFile 1 Results
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Event 204 Run 91 BFile 1
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Event 333 Run 91 BFile 1 Topology
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Event 333 Run 91 BFile 1 Results
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Event 358 Run 91 BFile 1 Topology
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Event 358 Run 91 BFile 1 Results
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Event 61 Run 60 BFile 3
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Best Fit
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Rejected by the Fit Algorithm
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Pictorial representation of the results of the
fit.
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Event 1799 Run 60 BFile 1
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Event 1799 Run 60 BFile 1
Best Fit
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Preliminary
Zenith Angular Distribution

• ?2 probability gt 0.2
• track selection according to the
  charge-likelihood
• more than 6 p.e.s per track

Zenith Angle (Degrees)