FF130613¶

This will be in Fermilab all day on 13th June. If we run out of time we can overrun into the software workshop on 15/16 June.

Rooms¶

9 am - 1 pm: Hornet's Nest (WH 8th floor crossover)
1 pm - 5pm: Theory room (WH 3rd floor NW)

Attendees¶

• Chris Rogers
• Durga Rajaram
• Ian Taylor

Agenda¶

• Maybe some overview (Rogers)
• Calibration code
  • Physics
  • Code structure
  • Code
• Monte Carlo
  • Geometry and survey
  • MC Digitisation
• Ckov
• Reconstruction
  • Data structure
  • Digits, slab hits, space points
  • Integration tests, documentation
  • Online plots

Notes¶

Calibration - General¶

1. Three parameters trying to access

• Trigger time delay which is pixel by pixel
  • delay between trigger station and the signal coming off a particular pixel
• Time walk correction which is PMT by PMT
• Speed of light in material

ACTION:

• calibration should record version of the code that was used;
• any inputs (e.g. datacards);
• this should be stored somewhere permanent, best in the calibration itself
  ACTION:
• TOF calibration - should be a documented procedure for what data to take
• TOF calibration - should be runnable by non-expert
  • Add a reducer - MapTOFPlot.py convert into a reducer
  • Output root histograms get put into end_of_run directory
  • Secondary script which:
    • runs the TOF calibration on data in end_of_run directory, taking a selected numbre of files
    • copies root histograms to PPD server micewww
    • uploads calibrations to config db
    • SOC trained to appropriate level to check if there are problems
      ACTION:
• Calibration should tie into geometry/survey; needs to be able to use
  ACTION:
• Calibration data should be sorted by data that the first run in the series was
  done
  ACTION:
• We will need a RAID array in PPD cluster or equivalent for calibrations
  • ~ 1 Gb required for TOF calibration histograms

Calibration - Yordan Code¶

calib.cpp

1. time walk
2. t0 calib
3. trigger calibration
• In order, one depends on previous
• All hard wired
  • e.g. central pixel is hard coded
  • e.g. distance between stations is hard coded
• Does fit to existing root file
• No comments

Time walk calib

• Uses minuit fit A + B/(x+C) + D/(x+C^2)
• Score function calculates chi2
• Fit has no limit
• Fit uses MIGRAD
• Fits on binned data

T0 calibration

• Fits to 3 peaks and require a minimum gap
• Full of lurking evil - needs lots of checks

Trigger calibration

• Looks okay

Common comment

• all calibrations should check chi2 and raise a warning if chi2
  is out of range
• check number of entries is reasonable
• Path length affect on time of flight? ~ 30 ps systematic
  • Cross check by looking at effect of quadrupole currents on calibration constants
• Particle speed affect on time of flight? - 20 ps systematic smearing of the ADC pulse electron velocity vs muon velocity

Calibration - Rayner¶

ACTION: rajaram to push to launchpad

• DONE

MCDigitizer¶

BUG: TOF hits outside of a slab
ACTION: header file needs comments
ACTION: Noise study (predicated on some trigger MC)

• Look at high rate data, decide if there is an issue
• Add trigger window
• Add ADC model
• Add noise

ACTION: Use MiceModules from GlobalReconstruction
ACTION: check_sanity should check for recon_events
ACTION: all_tof_digits.push_back(Json::Value()) is useless, line 81
ACTION: strig.str() needs to be moved down line 96
ACTION: line 82, line 110, line 111 are redundant (tof_evt)

make_digits()
ACTION: line 128 calling clear on a new std::vector is redundant
ACTION: make debug a datacard
ACTION: some of the type checking on hit members needs to be done
ACTION: ROGERS to add daq_event_type to MapPyReconSetup()
ACTION: encode station, plane, slab into a lookup table
ACTION: ask Maurizio what the time resolution of the PMT is
ACTION: break the function down

check_sanity_mc()
Nowt

get_npe()
ACTION: line 350 should be TOFpmtQuantumEfficiency
ACTION: random seed should be set off the primary

find_trigger_pixel()
ACTION: ROGERS - how do we set up trigger station

• When running pure MC
• When running MC of a run
  ACTION: should find earliest trigger pixel, rather than first trigger pixel

fill_tof_evt()
Nowt

Digits¶

ACTION: SetConfiguration does nothing
ACTION: YORDAN write up DAQ

SlabHits and SpacePoints¶

ACTION: TOF reconstruction should make slab hits for every combination of PMT hits
ACTION: Review Issue 568 and repeat that sort of analysis
ACTION: Write down which calibration and cabling was used in the data structure