HELYCON Hellenic Lyeum Cosmic Observatories Network Developing and Constructing An Extensive Air...
-
Upload
delaney-corn -
Category
Documents
-
view
215 -
download
1
Transcript of HELYCON Hellenic Lyeum Cosmic Observatories Network Developing and Constructing An Extensive Air...
HELYCON
Hellenic
Lyeum
Cosmic
Observatories
Network
Developing and Constructing
An Extensive Air Shower Detector
Antonis Leisos
Hep2006-Ioannina
Hellenic Open University
University of Patras
University of Athens
National technical University
NRCPS “Demokritos”
Cosmic Ray Energy Spectrum
The Concept
• primary mass
• energy
• age, Xmax
• space angle
• shower core
Single Station
GPSScintillator-PMTScintillator-PMT
Scintillator-PMT
DAQ
~20 m
1 m2
Single Station Set-Up
Triangulation
Shower Direction
Multi Station Set upGPS Synchronisation
The HELYCON Scintillation Module
Scintillator 2
Scintillator 3
GPS timestamp
Station Server
Prototype Construction
10 x 12 cm tiles
80 tiles ~ 0.96 m2
12 WLS fibers per row
Single PMT read out
Scintillators & WLS fibers
WLS fibers: Bicron (BCF-91A)
Light attenuation length: 330cm
Scintillators :
Protvino (Russia) Emission spectrum:420 nm Decay time 2 ns
PMT Testing
Photonis XP-1912Standard, 10-stage, 19 mm (3/4") round tube
Detector Testing
DAQ
GPS Input
USB PortTrigger Ouput4 PMT Signal Inputs
25ps accuracy TDC
DAQ•Handles 4-channels
•Adjustable PMT Thresholds
•Relative Arrival times < 1ns
•Estimates Pulse sizes (TOT) and Shapes
•Synchronization with GPS ~ 25ns
•Digital Interface to PC
•Slow Controls & Environmental Monitoring
HPTDC
• 32 channels (LR) – 8 Channels (HR)
•25ps (HR) to 800 ps (LR) accuracy
•Self Calibrating
GPS
(Motorola M12+Timing Oncore)
• 25 ns UTC accuracy can be better (up to 5ns)
Software Tools
CORSICA(Extensive Air Shower
Simulation)
GEANT4(Scintillation, WLS & PMT response)
Software Tools
DAQSIM(DAQ Simulation)
HOUANA(Analysis &
Track Reconstruction)
Time (ns)
Height (mV)
Zentih (degrees)
Monte Carlo Studies• Reconstruction of Shower Direction
• Reconstruction of the Shower Core
Properties
Vertical Proton Showers (106-107 GeV)
Distance from core (m)
Particles/m2
Monte Carlo StudiesNeeded corrections
curvature
thickness
ns after 1st particle
Core distance>500m
Monte Carlo Studies
Time Delay (ns)
Distance from core (mm)
Time Spread (ns)
Distance from core (mm)
Some Corrections (thickness)
Vertical Proton Showers (106-107 GeV)
Monte Carlo Studies
Θrec-Θtrue Pull
Single Station Performance
Vertical Proton Showers (106-107 GeV)
Monte Carlo Studies
Distance from core (m) Distance from core (m)
Reconstruction efficiency Resolution (degrees)
Single Station Performance
Vertical Proton Showers (106-107 GeV)
SQC (σθ=6.4) SQC (σθ=6.4)
Monte Carlo StudiesExamples of a 3-Station Performance
(Crude Analysis)
Vertical Proton Showers (106-107 GeV)
Threshold Charge (pes)
Resolution per reconstructed track (degrees)
HELYCON Online Control & Data Analysis Package
control
real time monitor
shower reconstruction
data analysis
real data & data summary storage
graphics & presenter
Time SchedulePrototype detector full test
(PMT and Scintillator)
May 2006
Production & test of 15 detectors
July 2006 (2 detectors per week)
Electronics Testing May-June 2006 (the prototype is currently tested)
DAQ Test + Detectors July-September 2006
Online Software-Analysis Tools-Reconstruction Strategy Development
-September 2006
3 station Run Autumn 2006
HELYCON in Patras
1019 eV
1017 eV
1015 eV
2 km
Eurocosmics
The General Idea…
•Angular offset
•Efficiency
•Resolution
•Position
The Example of Amanda-Spase
30 stations (4 scint. 0.2 m2 in a triangular grid, 30m spacing)
B10 resolution 3.8 degrees
~4km
~20km
Very High Energy
Very High Zenith AngleExtreme low rate
Floating stations
(Sea Technology?)
The Concept
We propose a minimum of 3 stations with at least 3 m2 scintillator
detectors each
Monte Carlo StudiesExamples of a Multi-Station
Performance
(Crude Analysis)
Vertical Proton Showers (106-107 GeV)
Station Configuration
Not need for position holding
Resolution in determining a possible Angular Offset (degrees)-10 day operation
Number of stations