1. GRAPES-3: Status of ROOT Based Monitoring and Analysis
Shashi Dugad
(for GRAPES-3 Collaboration)
Cosmic Ray Laboratory,
Tata Institute of Fundamental Research,
Ooty, INDIA
Workshop on Astro-Particle Physics, Dec 14-16, 2010, Ooty

2. GRAPES-3 DATA GRAPES-3 Data (15GB/day)
Weather Station
Scintillator Detectors
400 + ………721
Proportional Counters
………7424
Pressure, Temp., Humidity, Rainfall, Windspeed etc.
Rate Monitoring DAQ (1GB/day)
EAS DAQ
(8GB/day)
Muon Angle DAQ
(5GB/day)
GRAPES-3 Data
(15GB/day)
With expanded array the data size ~ 40GB/day or 15 Tera Bytes/year

3. Mandate Large storage space and computing power
Efficient monitoring of detectors
Ease of accessing data
Parallel approach to develop data analysis, detector monitoring software with participation of bigger team
Portability of data to wider collaboration
Object Oriented Approach

4. Object Oriented Approach to GRAPES-3 Data
Adaptation of object oriented language C++
Object oriented design of all analysis programs in form of classes under ROOT framework.
Storage of event data in ROOT Tree structure which provides efficient access of data for analysis.
ROOT provides excellent graphical connectivity to the data object
The biggest advantage of OO design is, ease in managing large codes and the scope for any future developments. Not so easy in a procedural oriented approach.

5. GRAPES-3 Data Analysis Architecture
Monitoring Raw
Data
MU Raw Data
MU Rate Data
SC Raw Data
Raw ROOT Data
ROOT Data
Raw ROOT Data
Raw ROOT Data
Shower Reco. ROOT Data
Calibration
Muon Reco. ROOT Data
Rate Analysis ROOT Data
Data Quality Monitoring
Physics Analysis:
Solar Physics Atmospheric Physics
Shower Parameters
(Xc,Yc, , , Ne, N)
(Size, Age, Energy,)
Physics Analysis:
Cosmic Ray Physics, Astronomy, etc.

6. Automated Calibration
ADC Calibration
Calibration with Muons
Shower Mean Signal
TDC Calibration
Clocks with different frequency and delay
Self Trigger Peak
RTTC Trigger Peak
Muon Timing

7. Interactive Debugging
Root[0] scevtree->Draw(“tdc>>h1(4095,0,4095)”, ”detno==1 &&
trigger==2&& evtime> && evtime <=020000”)
Self Trigger

8. Scintillator Calibration with Muons
Detectors calibrated by generating
muon trigger using two paddles
placed below scintillator
Several detectors calibrated in day
by moving paddles to different
detectors
Algorithm developed to identify
calibrated detectors in the data
Muon data analysed to get calibrated
parameters and stored into the
database

9. TDC Calibration with Crystal Oscillator

10. Automated Monitoring Tools
Use data for data quality monitoring on daily basis
EAS Trigger, Calibration, Rate and Weather Data
Several parameters identified that are sensitive to the performance of array
Performance Index of each parameter is obtained using day long data
Abnormal detectors are identified using this index

11. Monitoring Parameters
Pedestal Mean, RMS
ADC Shower Mean
TDC Mean, RMS
Scintillator Rate, Temperature
ADC Rate, TDC Rate, A/T Ratio
AWT, TWA, PTDC

12. Scintillator Array Monitoring

13. ADC/TDC Bit Monitoring
Use data from EAS Trigger
For a given ADC count get
its binary pattern
Find the occupancy of each
bit of a every ADC channel

14. Monitoring of Module Performance

15. Muon Data Quality Monitor

16. Muon Data Quality Monitor

17. Solar/Atmospheric Physics with 576 m2 Muon Detector
Muon Rate Vs Time as Recorded:
RMS/Mean=20/3040
Muon Rate Vs Time after data
validation: RMS/Mean=17.5/3039
Muon Rate Vs Time after Pressure
correction: RMS/Mean=3.7/3028

18. Weather Parameters
Pressure
Outside Temperature
Inside Temperature

19. Muon Rate Vs Time during
to (17 days)
Muon Station 0
Muon Station 3
Sensitivity to change in Rate ~0.01% !!!
Corresponds to change of barometric
pressure at sub-mm level

20. Decrease in muon rate
at shorter time scale

21. Weather Parameters

22. Summary
The Object Oriented architect of GRAPES-3 data proven to be robust and efficient
GRAPES-3 ROOT framework is being used successfully for data quality monitoring
ROOT framework implemented for most of the data streams
Muon rate analysis framework now ready for physics analysis
Calibration database for scintillator array ready
Reconstruction program under ROOT framework is under progress

23. THANKS