R. Coniglione, KM3NeT, Catania 10-13 March ‘08
NEMO geometry studies
R. Coniglione and P. SapienzaIstituto Nazionale di Fisica Nucleare- Laboratori Nazionali del Sud
NEMO geometry and bar length effects
Geometry studies:Energy dependenceAngular dependence Atmospheric muons
R. Coniglione, KM3NeT, Catania 10-13 March ‘08
Inputs in the Antares codes• Muon simulation up-going• Trigger based on (local coincidence) or
(high amplitude hit p.e.>2.5p.e.)• Capo Passero water parameters• Trigger (floor coincidence 3 / 4 or amp.
>2.5 p.e.) - Aart strategy• old angular efficiency in PMT
Bar length effect
The geometryN° PMT
&Size
Stucture type
N° Strucut
ure
Structure distance
(m)
Storeydistance
(m)
N° storey/structure
N° PMT/floor
Volume(km3)
NEMO_81 583210”
NEMO-tower 81 140 40 18
42 (down-
hor)
Cube V=1.14·1.14·0.68 =
0.88
Effective muon area as a function of the bar length and the optical
background rate
• Bar length 20, 15, 10, 7.5, 1 m• Optical background 35,50,100,150
kHz
20m 1 m
from to …..
R. Coniglione, KM3NeT, Catania 10-13 March ‘08
Bar length effect
35 kHz bar length 20m bar length 15mbar length 10mbar length 7.5mbar length 1m
quality cut applied 1°@1TeV
Effective area ratio with respect to 20m
R. Coniglione, KM3NeT, Catania 10-13 March ‘08
Bar length effect
50 kHz – quality cut applied 1°@1TeV
Muon effective area
bar length 20m bar length 15mbar length 10mbar length 7.5mbar length 1m
Effective area ratio with respect to 20m
R. Coniglione, KM3NeT, Catania 10-13 March ‘08
Bar length effect
1m bar lenght
15m bar lenght
50 kHz backgroundE 102 104 GeV
RMS ~55°
RMS ~65°
rec
rec rec
rec
Vertical muonscos >0.8 (~36°)
RMS ~24°
RMS ~27°
R. Coniglione, KM3NeT, Catania 10-13 March ‘08
Bar length effect
100 kHz – quality cut applied 1°@1TeV
Ratio with respect to 20mMuon effective area
bar length 20m bar length 15mbar length 10mbar length 7.5mbar length 1m
R. Coniglione, KM3NeT, Catania 10-13 March ‘08
Bar length effect
150 kHz – quality cut applied 1°@1TeV
Ratio with respect to 20mMuon effective area
bar length 20m bar length 15mbar length 10mbar length 7.5mbar length 1m
R. Coniglione, KM3NeT, Catania 10-13 March ‘08
Bar length effect
quality cut applied 1°@1TeV
Muon effective area
Bar lenght 20mBar lenght 1m
35 kHz 50 kHz100 kHz150kHz
R. Coniglione, KM3NeT, Catania 10-13 March ‘08
Geometry studies
The geometriesN° PMT
&Size
Stucture type
N° Strucut
ure
Structure distance
(m)
Storeydistance
(m)
N° storey/structure
N° PMT/floor
Volume(km3)
Ant_127952510”
ANTARES string 127 100 15 25
3 a 45°Down-looking
HexagonV ~ 0.344
NEMO_127914410”
NEMO tower
127 120 40 184
down-horiz
SpiralV ~ 1.17
Inputs • Neutrino simulation E-2 spectrum• ANTARES water parameters• New PMT angular acceptance (fit1
Genova Antares note 2008-001)• 40 kHz background• Trigger based on (local coincidence) or
(high amplitude hit p.e.>2.5p.e.)• Aart reconstruction
R. Coniglione, KM3NeT, Catania 10-13 March ‘08
Aart strategy > -6.3
data = 0.65 reco tr/sMC = 0.72 reco tr/s
ratio = 0.9
dataGenova param(Valencia meeting)
rec.
tra
ck/s
> -6.3
Aart strategy
dataGenova param(Valencia meeting)
rec.
tra
ck/s
No QC
Aart strategy
Aart strategyNO QC
data = 0.97 reco tr/sMC = 0.87 reco tr/s
ratio = 1.1
dataGenova param(Valencia meeting)
Aart strategy
From A. Margiotta
R. Coniglione, KM3NeT, Catania 10-13 March ‘08
After cut applied to reject and muon background in sensitivity studies for point like sources
Energy spectrum of detectable neutrinos
Energy range of interest:1-100 TeV
=1.5
=2 =2.5
Geometry studies: the energy range
R. Coniglione, KM3NeT, Catania 10-13 March ‘08
Detector performance vs energy
ANT_127 (9525PMT)
NEMO_127 (9144PMT)
40 kHzWithout quality cut
rec
A e
ff (
m2)
A e
ff (
m2)
With Quality cut
rec
ratio
rec
up-going
R. Coniglione, KM3NeT, Catania 10-13 March ‘08
Detector performance vs zenith angle
Ant_127
102 103 GeV103 104 GeV104 105 GeV105 106 GeV106 107 GeV
With quality cutrec
NEMO 127rec
R. Coniglione, KM3NeT, Catania 10-13 March ‘08
Detector performance vs zenith angle
103 104 GeV 104 105 GeV
ANT_127 NEMO_127
These results, with the new PMT angular acceptance, confirm the bestperformance for vertical muons of the tower-like geometry. -> New trigger could be explored
R. Coniglione, KM3NeT, Catania 10-13 March ‘08
Detector performance: the atmospheric muons
work in progress
The geometriesN° PMT
&Size
Stucture type
N° Strucut
ure
Structure distance
(m)
Storeydistance
(m)
N° storey/structure
N° PMT/floor
Volume(km3)
Ant_127952510”
ANTARES string 127 100 15 25
3 a 45°Down-looking
HexagonV ~ 0.344
NEMO_127914410”
NEMO tower
127 120 40 184
down-horiz
SpiralV ~ 1.17
Inputs • Atmospheric muons simulated with
Okada• ANTARES depth 2400m• ANTARES water parameters• New PMT angular acceptance (fit1
Genova)• 40 kHz background• Trigger based on (local coincidence) or
(high amplitude hit p.e.>2.5p.e.)• Aart reconstruction
NEMO_127 ANT_127
R. Coniglione, KM3NeT, Catania 10-13 March ‘08
Detector performance vs atmospheric muons
At the can level
ANT_127 NEMO_127
Flux NEMO_127
Flux ANT_127 ~ 3
R. Coniglione, KM3NeT, Catania 10-13 March ‘08
Detector performance vs atmospheric muons
cos rec
ANT_127 NEMO_127
Reconstructed muonsNo quality cut applied
ANT_127 NEMO_127
Misreconstructed flux (cos rec >0 )
Flux ANT_127
Flux NEMO_127 ~ 3
Energy spetrum at the can of reconstructed muonsNo quality cut applied
R. Coniglione, KM3NeT, Catania 10-13 March ‘08
Down going muons
Median and effective area for down-going muons
ANT_127 NEMO_127
R. Coniglione, KM3NeT, Catania 10-13 March ‘08
Atmospheric muons: PMT angular acceptance effect
Genova PMT angular acceptance Old PMT angular acceptance
Reconstructed muonsNo quality cut applied
ANT_127 NEMO_127
ANT_127 NEMO_127
R. Coniglione, KM3NeT, Catania 10-13 March ‘08
OUTLOOK
Simulations for the “reference” detector described in the S. Kuch thesis are in progress.
New triggers that optimize the performance for each detector geometry should be implemented
Mupage simulation to explore the effects of multi-muon events
Sensitivity studies for different neutrino sources and different geometries
