1

NNeutrino eutrino EExtended xtended SSubmarine ubmarine TTelescope with elescope with OOceanographic ceanographic

RResearchesearch

Operation and performance of the NESTOR test Operation and performance of the NESTOR test

detectordetector

2

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

20032003

3

     

                       

NESTOR Star Deployment (March 2003) NESTOR Star Deployment (March 2003)

4

Track Reconstruction

muon track generation

muon propagation & γ shower generation

Cherenkov photon emission and propagation

GEANT

FASTSIM

PMT response simulation

Digitization ATWD &Trigger simulation

background noise

Waveform Reconstruction

DST Production

Hit DefinitionData Quality Histograms

MiniDST Ntuples & Histograms

Calibration Data Analysis

Calibration Database Quality Histograms

Database (gains, baselines,attenuation etc)

Raw Data

Interface

Software Monitor Histograms

Data Analysis FlowData Analysis Flow

5

Signal processing: Attenuation Corrections

Double pulse disentangling

Vo

ltag

e (

mV

)Time (ns)

Before the attenuation corrections

After the attenuation corrections

“automatic” separation

Vo

ltag

e (

mV

)

Time (ns)

Fit double pulses

Rise time “recovery”

6

Signal processing

Timing and Amplitude Effects

Data from a depth of 3800mData from a depth of 3800m

σ: 0.8ns

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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

Data from a depth of 3800 m

PMT Pulse Height Distribution

Calibration

K40 Background: A stable calibration source

8

Trigger: ≥4fold CoincidenceSingle PMT RatesSingle PMT Rates

Data from a depth of 3800mData from a depth of 3800m

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Data from a depth of 3800 m

Bioluminescence Occurs for the 1.1% ± 0.1%

of the Active Experimental Time

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Calibration Data Analysis

Calibration Database Quality Histograms

LED Calibration Data

Gain Monitors

Data from a depth of 3800 mCalibration Run

Time Difference (ns)

Nu

mb

er o

f E

ven

tsN

um

ber

of

Eve

nts

Time Difference (ns)

<Δt>: 0.6 ± 0.1 ns

σ : 3.3 ± 0.1 ns

<Δt>: 0.2 ± 0.1 ns

σ : 3.3 ± 0.1 ns

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Calibration Data Analysis

Calibration Database Quality Histograms

Data from a depth of 3800 mCalibration Run

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Data from a depth of 3800 mTrigger Studies

Experimental Points

M.C. Estimation (Atmospheric muons + K40 )

M.C. Estimation (Atmospheric muons only )

Data Collected with

4fold Majority Trigger

c

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Data from a depth of 3800 mTrigger StudiesData Collected with

4fold Majority Trigger

Experimental Points

M.C. Estimation (Atmospheric muons + K40 )

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Experimental Points

M.C. Estimation (Atmospheric muons + K40 )

PMT Pulse Height Distributions

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Charge & Timing information