CANGAROO

CANGAROO-III の完成
II
京大理中森健之
谷森達窪秀利西田大輔
他CANGAROOチーム
Contents
★CANGAROO望遠鏡4号機建設報告
★4号機のDAQとその性能
Construction of 4th Tel.
2003
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Aug
Telescope body construction
2004
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Jan 5th
Cargo departure by ship
Feb 23rd Cargo arrival at Woomera
Feb 27th~ Mirror alignment
Mar 4th ~ Camera installation
Electronics installation
Mar 14th First light !
Camera Installation
Elec. hut
Elec. Installation
DAQ of 4th Tel.
VME on board CPU （Dynatem DPC2)
PentiumIII 600MHz
Redhat Linux 6.2, kernel 2.2
VME 64chTDC （AMSC)
0.8nsec time resolution
VME 32ch charge ADC
delay chip self-contained

Event data
~3kB/event
Scaler on VME 16ch Frontend module
HV hut Temp.
Elec.hut Temp.
Camera Temp.
HV Voltage
Monitor
Telescope pointing
data
~5kB/sec
DAQ logic
ADC
Camera
TDC start
Scaler
# of hit PMTs
Logical sum
DAQ trigger
Analog sum
Frontend Module
# of p.e.
GPS 1PPS
ADC gate
TDC stop
Event display
bilby4
duckbill4
Event
Monitor
wallaby4
TDC
ADC
Scaler
Star Map
Tel.
~ 1Hz
python
© Pascal PETIT
Event display
DAQ Performance
triggered shower events
90%
Typical value
in observations
80%
240Hz
40%
100Hz
1.5kHz
Trigger rate [Hz]
Quick Analysis (1)
90Hz
Trigger
rate [Hz]
Raw
T4a
Obs. time [min]
|TDC| < 50ns
60Hz
NSB rejected
Obs. time [min]
γ Energy
Threshold
[GeV]
T1
1.6
400
T2
T3
T4
25
25
60
200
200
<200
Quick Analysis (2)
Sum ADC Spectrum
TDC start
2*106
105
Power law
~E-2.7
106
Raw
NSB rejected
19ns (FWHM)
NSB rejected
Photo electron
-100ns
0
100ns
Summary
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CANGAROO-III completed
construction of 4 telescopes.
The 4th tel. is now going on.
Shower accept rate is ~60Hz.
Energy threshold seems to be
lower than others

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