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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
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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
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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
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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.
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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.
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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
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Interactive Debugging
Root[0] scevtree->Draw(“tdc>>h1(4095,0,4095)”, ”detno==1 && trigger==2&& evtime> && evtime <=020000”) Self Trigger
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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
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TDC Calibration with Crystal Oscillator
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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
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Monitoring Parameters
Pedestal Mean, RMS ADC Shower Mean TDC Mean, RMS Scintillator Rate, Temperature ADC Rate, TDC Rate, A/T Ratio AWT, TWA, PTDC
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Scintillator Array Monitoring
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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
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Monitoring of Module Performance
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Muon Data Quality Monitor
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Muon Data Quality Monitor
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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
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Weather Parameters Pressure Outside Temperature Inside Temperature
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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
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Decrease in muon rate at shorter time scale
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Weather Parameters
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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
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THANKS
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