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Adrian Orea, FNAL SIST Intern
Supervisor: Minerba Betancourt
UIUC Mechanical Engineering
3 August 2018
SBND Electronics Data Analysis
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• Objective
• Background
– LArTPC and test beam
– Purity
• Purity Calculation
• Multi-Channel FFT and Waveform plotting framework
• Noise RMS Analysis
• Raw Digit Event Display
• Future work
• Conclusion
Outline
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• Time Projection Chamber (TPC)
– Filled with Liquid Argon
– Two Planes
• Collection and Induction
– High electric field
– Used at several detectors
• SBND, MicroBooNE, Icarus, and DUNE
LArTPC
8/9/20183
1
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• FTBF used to test detectors with a beam of protons
– Beam for this project was a mixture of protons, pions, and
kaons
• Beam is pulsed
– SBND TPC placed in Cryostat
– Boards and wiring secured
• Data was collected for several days at a time
– Cosmic muon data could also collected
TPC at Fermilab Test Beam Facility (FTBF)
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• Free electrons can easily travel through liquid Argon
– Some get recaptured by Argon Ions
• Although a tank of pure Argon is ideal, it’s not
– Potential contamination during various filling and boiling phases
– Innate contamination from source
• Electronegative contaminants capture free electrons
– Oxygen, water, etc
Purity Calculation
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Ar Ar Ar Ar Ar Ar
Ar+ Ar Ar
Ar Ar Ar Ar Ar
Ar+ Ar+ Ar+
Ar+
Ar+
Ar+ Ar+
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• Apply first cut on number of hits and unique wire numbers
– Plot Peaktime vs wire number, acts as a track reconstruction
• Induction and collection planes
– Remove points farther than 2 ticks from fit line
Purity Calculation
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Collection Plane Induction Plane
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– Plot integral (charge) vs peak time
• Fit with exponential, normalized based on geometry
Purity Calculation cont.
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– Create histogram of difference between fit and data
• Fit with Landau function to get sigma
Purity Calculation cont.
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– Refit with sigma cuts
• Keep values and store into file that is used as input for a minimizer
of a maximum likelihood estimator (MLE)
• Lifetime is extracted
Purity Calculation cont.
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Event Display
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• Current event display works great
– However, is loaded with features
– Using for small checkups such as thresholds is slow
• For changing Collection and Induction planes separately
• Created a fast Event display that uses the output of Purity.cc
– “Lite version”
• Fast and reliable
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• Current Plotting scripts analysis works
– However, per event and per channel basis
• Need a script to gather all of the channel data to analyze on
an event basis
– FFT and waveform plotting
Multi-Channel Analysis
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• Data was not correct
• Malfunction in wires
– Collection had inverted peaks
– Induction had noisy wires and a broken motherboard
Data
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Data cont.
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Ignored because of high noise
Collection Plane
Induction Plane
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Multi-Channel Analysis cont.
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• From the purity calculation, values away from the linear fit are
used to calculate the RMS of the noise
• Currently exits on an event basis
– Now averages over the entire set of events in a file
– Induction and Collection plane are separate
Noise RMS
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RMS Plots
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• Purity is added to framework
– Part of VST git repository
• Noise RMS is finished
– Useful for analyzing the channels
• Pinpointing bad channels
• FFT & Waveform vs Channel is finished
– Part of VSTAnalysis git repository
• Event display is done
– Operates as long as Purity.cc operates
Results
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• Tune the Purity.cc code for data from simulation
– Modifying “sigma” cuts
• RMS used to set threshold based on the event
– To eliminate general settings
• Finalize a script for analyzing the general trend of lifetimes
Future Work
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• I would like to thank the following people for their patience
and help as they were always available to answer my many
questions.
– Minerba, Gray, Thomas, Dominic
• Thank you to my Fermilab mentors for helping me with
general work at Fermi and with my education path
– Donovan, Javier, and Elliot
• Finally, I would also like to thank Fermilab and the SIST
committee, for such an amazing summer experience
– Sandra, Judy, Laura
Acknowledgments
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Distance from linear fit
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Data Induction Plane Noise
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Data analysis
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Beam Composition
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