LaRocca - Centro Fermi

II Conferenza dei Progetti del Centro Fermi
Rome - April 20th, 2012
Status of the EEE
telescopes in Catania
Paola La Rocca
The EEE telescopes in Catania 1/4
2 telescopes (CT-01 and CT-02)
3.05 km apart
3.05 Km
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
The EEE telescopes in Catania 2/4
TEL CT-01
TEL CT-02
Latitude
37° 31’,500 N
37° 29’,325 N
Longitude
15° 04’,046 E
15° 03’,064 E
Altitude
210 m a.s.l.
110 m a.s.l
Distance
between
chambers
80 cm
80 cm
Orientation
w.r.t. NORTH
60 °
300°
Underground floor
Position inside
(5 concrete roofs
the building
above the telescope)
Ground floor
(light roof above
the telescope)
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
The EEE telescopes in Catania 3/4
CT-01 Telescope
(Department of Physics)
Running from April 2008
 Acquisition rate ~ 22 Hz
 Collected data ~ 2 x109
events
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
The EEE telescopes in Catania 4/4
CT-02 Telescope
(Istituto Tecnico S.Cannizzaro)
Running from December 2008
 Acquisition rate~ 20 Hz
 Collected data ~ 1 x 109
events
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
Activities in the schools 1/3
Lessons and advanced courses
- “Corso di eccellenza” (2008-2009)
- “Corso di Grid Computing” (2010)
- “Corso di Fisica delle Alte Energie” (2011)
- PON Project “Raggi Cosmici in Classe” (2012)
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
Activities in the schools 2/3
Web and Media
- Web Site (eeecatania.tk)
- Participation to Local and national Conferences on
Science
- Local newspapers
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
Activities in the schools 3/3
Prof. A.Zichichi
at ITIS Cannizzaro
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
Some scientific results obtained with
the EEE telescopes in Catania
Study of the muon flux
- Barometric effect
- Observation of a Forbush decrease
Study of correlations between telescopes
- Short-distance correlations (EEE telescope +
scintillator)
- Detection of EAS with EEE telescopes
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
Study of the Barometric Effect
The muon flux measured at the sea level
changes with the atmospheric pressure
Atm. Press.
(mbar)
Counts/h
~ 7 days
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
Forbush decrease
Valentine’s day solar flare
(Feb. 2011)
Moscow Neutron Monitor
http://helios.izmiran.troitsk.ru/cosray/main.htm
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
Pressure
Rate
The solar flare
as observed by
the CT-01
telescope
Corrected rate
TIME
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
Correlation between the counting rate
measured by the Oulu neutron monitor
and the CT-01 telescope
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
Neutron Monitors limits:
- Sensitive to low energy neutrons
- No information about neutrons
orientation
Use of muon telescopes/hodoscopes for
Forbush decreases:
- Possibility to study the dependence of
the Forbush effect upon the zenithal
angle of the muons
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
Angular dependence of the amplitude
variation
Muons
arriving with
a larger
zenithal angle
are supposed
to be
associated to
higher-energy
primaries
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
Short-distance correlations (<500m)
between EEE telescopes and scintillators
Small scintillator
telescope
Roof
P-3
P-2
P-1
PT
EEE Telescope
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
Astroph. Obs. 450 m 22 d
INFN LNS
146 m 10,5 d
Dept. of
Phys.
25 m
36 m
82 m
3d
1,5 d
11 d
d = 25 m
d = 36 m
T
T
d = 82 m
T
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
d = 450 m
d = 146 m
T
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
T
Dechoerence Curve
It can be used to evaluate the expected coincidence
rate between 2 EEE telescopes
Rate not corrected
for efficiency and
acceptance
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
Detection of EAS with EEE telescopes
in Catania
15 x 106 events
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
More statistics
100 x 106 events
Rate ≈ 1 coinc/day
No Time Correction
Relative angle < 25°
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
Outlook
- Comparison with results from different EEE sites
- Comparison with simulations
Cagliari
520 m
CERN
15 m
L’Aquila
200 m
Frascati
600 m Catania
3050 m
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012