Status of the EEE telescopes in Catania Paola La Rocca II Conferenza dei Progetti del Centro Fermi...
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Transcript of Status of the EEE telescopes in Catania Paola La Rocca II Conferenza dei Progetti del Centro Fermi...
Status of the EEE telescopes in
CataniaPaola La Rocca
II Conferenza dei Progetti del Centro Fermi
Rome - April 20th, 2012
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
3.05 Km
The EEE telescopes in Catania 1/42 telescopes (CT-01 and CT-
02) 3.05 km apart
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
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°
Position inside the building
Underground floor (5 concrete roofs above the telescope)
Ground floor (light roof above the telescope)
The EEE telescopes in Catania 2/4
Running from April 2008
Acquisition rate ~ 22 Hz Collected data ~ 2 x109 events
CT-01 Telescope(Department of Physics)
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
The EEE telescopes in Catania 3/4
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
The EEE telescopes in Catania 4/4
- “Corso di eccellenza” (2008-2009)
- “Corso di Grid Computing” (2010)
- “Corso di Fisica delle Alte Energie” (2011)
- PON Project “Raggi Cosmici in Classe” (2012)
Lessons and advanced courses
Activities in the schools 1/3
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
- Web Site (eeecatania.tk)
- Participation to Local and national Conferences on Science
- Local newspapers
Web and Media
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
Activities in the schools 2/3
Prof. A.Zichichi at ITIS Cannizzaro
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
Activities in the schools 3/3
- Barometric effect
- Observation of a Forbush decrease
Study of the muon flux
Some scientific results obtained with the EEE telescopes in Catania
- Short-distance correlations (EEE telescope + scintillator)
- Detection of EAS with EEE telescopes
Study of correlations between telescopes
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
The muon flux measured at the sea level changes with the atmospheric pressure
Study of the Barometric Effect
Counts/h
Atm. Press. (mbar)
~ 7 daysII Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
Forbush decreaseValentine’s day solar flare (Feb. 2011)
Moscow Neutron Monitorhttp://helios.izmiran.troitsk.ru/cosray/main.htm
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
The solar flare as observed by the CT-01 telescope
Pressure
Rate
Corrected rate
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
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
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 muonsII Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
Angular dependence of the amplitude variation
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
Muons arriving with a larger zenithal angle are supposed to be associated to higher-energy primaries
Short-distance correlations (<500m) between EEE telescopes and scintillators
PT
P-1
P-2
P-3
Roof
EEE Telescope
Small scintillator telescope
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
d = 36 m
d = 82 m
d = 25 m
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
T T
T
d = 146 m
d = 450 m
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
TT
Dechoerence CurveIt can be used to evaluate the expected coincidence rate between 2 EEE telescopes
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
Rate not corrected for efficiency and acceptance
Detection of EAS with EEE telescopes in Catania
15 x 106 events
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
More statistics100 x 106 events
No Time CorrectionRelative angle < 25°
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012
Rate ≈ 1 coinc/day
Outlook- Comparison with results from different EEE sites
- Comparison with simulations
CERN15 m
L’Aquila200 m
Cagliari520 m
Frascati600 mCatania
3050 m
II Conferenza dei Progetti del Centro Fermi, Rome - April 20th, 2012