1 N eutrino E xtended S ubmarine T elescope with O ceanographic R esearch Operation and performance...
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Transcript of 1 N eutrino E xtended S ubmarine T elescope with O ceanographic R esearch Operation and performance...
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
9
Data from a depth of 3800 m
Bioluminescence Occurs for the 1.1% ± 0.1%
of the Active Experimental Time
10
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
12
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
13
Data from a depth of 3800 mTrigger StudiesData Collected with
4fold Majority Trigger
Experimental Points
M.C. Estimation (Atmospheric muons + K40 )