25 July 2005Michel Lefebvre 1 Noise file for EMEC-HEC 2002 data Michel Lefebvre Physics and Astronomy University of Victoria British Columbia, Canada 25.

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Presentation transcript:

25 July 2005Michel Lefebvre 1 Noise file for EMEC-HEC 2002 data Michel Lefebvre Physics and Astronomy University of Victoria British Columbia, Canada 25 July 2005

Michel Lefebvre 2 Motivation and Data set  No random trigger data sets available for EMEC- HEC 2002  Use normal runs to estimate the cell noise we are interested in the noise present after optimal filtering required for the Athena based analysis of EMEC-HEC 2002 data these noise values should probably eventually be available to Athena through a database  Data set muon runs 13182, 13184, 13186, 13187, 13188, 13204, 13211, impact point C to K, except E TDC available for these runs

25 July 2005Michel Lefebvre 3 Athena Ntuple production  Use Athena LArHECTBAna to produce combined ntuples Ntuples produced by Naoko did not use the latest calibrations Used Athena (thanks to Rolf’s help) event signal array is now compressed (connected channels only) pedrms arrays contain unconnected channels A bug has been uncovered in LArTBCombinedNtup.cxx pedrms arrays were truncated Use TDC Used the same calibrations as used by Rolf to produce ESD’s /afs/cern.ch/user/h/hectbmon/public/tb/aug02/dig/coeff_hec_aug02_ dat /afs/cern.ch/user/h/hectbmon/public/tb/aug02/dig/coeff_emec_high_aug02_ dat /afs/cern.ch/user/h/hectbmon/public/tb/aug02/dig/weights_hec_amp_aug02_ dat /afs/cern.ch/user/h/hectbmon/public/tb/aug02/dig/weights_hec_tim_aug02_ dat /afs/cern.ch/user/h/hectbmon/public/tb/aug02/dig/time_offset_hec_aug02_ dat /afs/cern.ch/user/h/hectbmon/public/tb/aug02/dig/weights_emec_high_amp_aug02_ dat /afs/cern.ch/user/h/hectbmon/public/tb/aug02/dig/weights_emec_high_tim_aug02_ dat /afs/cern.ch/user/h/hectbmon/public/tb/aug02/dig/time_offset_emec_aug02_ dat Verified (looking at one event!) that Naoko’s ntuples can be reproduced with Athena when using the appropriate calibration and weights files

25 July 2005Michel Lefebvre 4 TBRootAna noise file production  Method define a criteria that identifies cells that have particle signal in them; these are called contaminated cells for non-contaminated cells, the only signal is electronics noise; accumulate events and fit for the noise compute the average noise/pedrms per pseudorapidity layer using non-contaminated cells noise results for contaminated cells, scale their pedrms by the appropriate average noise/pedrms

25 July 2005Michel Lefebvre 5 Noise file production  Cell contamination criteria If too loose, then there ends up too many interpolation, which is not good since there are important variations in the noise/pedrms ratio from cell to cell If too tight, contamination of beam particle signal biases the noise; this is not a serious problem for muon runs  HistoMean-FitMean > 3*FitMeanError (fit in +/- 2  )  HistoMean > 0.15*HistoRMS example, run GeV  - : this HEC cell qualifies as a contaminated on both counts!

25 July 2005Michel Lefebvre 6 Example noise production: 150 GeV  -  Pathological cells

25 July 2005Michel Lefebvre 7 Example: 150 GeV  -  HEC: 9 cells out of 183 are identified as contaminated  EMEC: 34 cells out of 976 are identified as contaminated

25 July 2005Michel Lefebvre 8 Example: 150 GeV  -  HEC: noise/pedrms run 13188

25 July 2005Michel Lefebvre 9 Example: 150 GeV  -  EMEC: noise/pedrms run 13188

25 July 2005Michel Lefebvre 10 Comparing TDC vs GCT: 150 GeV  -  Fractional noise difference rms = 2.5%rms = 2.7%

25 July 2005Michel Lefebvre 11 Comparing two runs: 150 GeV  -  Fractional noise difference rms = 2.5% rms = 1.9%

25 July 2005Michel Lefebvre 12 Comparing eight runs: 150 GeV  -  Fractional noise difference with the mean noise rms = 1.8% rms = 1.3%

25 July 2005Michel Lefebvre 13 Comparing eight runs: 150 GeV  -  HEC: rms/mean noise evidence of small muon contamination  The eight runs are on impact points C to K, except E

25 July 2005Michel Lefebvre 14 Comparing eight runs: 150 GeV  -  EMEC: rms/mean noise no clear evidence of muon contamination

25 July 2005Michel Lefebvre 15 Noise files for Athena /afs/cern.ch/user/h/hectbmon/public/tb/aug02/noise/H6_2002Noise13188.dat /afs/cern.ch/user/h/hectbmon/public/tb/aug02/noise/H6_2002NoiseMuons.dat # H EMEC-HEC noise file # Produced from an average over muon+ 150 GeV runs # 13182, 13187, 13204, 13184, 13186, 13188, 13211, # /afs/cern.ch/user/h/hectbmon/public/tb/aug02/tdc/tdc_wac_ dat # /afs/cern.ch/user/h/hectbmon/public/tb/aug02/ped/ped_{runno}_hec.dat # /afs/cern.ch/user/h/hectbmon/public/tb/aug02/dig/weights_hec_amp_aug02_ dat # /afs/cern.ch/user/h/hectbmon/public/tb/aug02/dig/weights_hec_tim_aug02_ dat # /afs/cern.ch/user/h/hectbmon/public/tb/aug02/dig/time_offset_hec_aug02_ dat # /afs/cern.ch/user/h/hectbmon/public/tb/aug02/dig/coeff_hec_aug02_ dat # /afs/cern.ch/user/h/hectbmon/public/tb/aug02/ped/ped_{runno}_emec_high.dat # /afs/cern.ch/user/h/hectbmon/public/tb/aug02/dig/weights_emec_high_amp_aug02_ dat # /afs/cern.ch/user/h/hectbmon/public/tb/aug02/dig/weights_emec_high_tim_aug02_ dat # /afs/cern.ch/user/h/hectbmon/public/tb/aug02/dig/time_offset_emec_aug02_ dat # /afs/cern.ch/user/h/hectbmon/public/tb/aug02/dig/coeff_emec_high_aug02_ dat # # HEC: 3.27 MeV/nA # EMEC: 0.43 MeV/nA # # HEC noise # offlineID noise(MeV) error(MeV) febno offlineID [ ] [ ] [ ] [ ] [ ]

25 July 2005Michel Lefebvre 16 Comparison with Sven’s noise file  Differences in production Sven’s noise file assumed constant noise/pedrms ratios Sven used different calibration files correct for this before comparing

25 July 2005Michel Lefebvre 17 Comparison with Sven’s noise file  HEC: check noise/pedrms  SVEN’s : the ratio distribution is a constant  The width here is due to imperfect correction for different calibration files used

25 July 2005Michel Lefebvre 18 Comparison with Sven’s noise file  EMEC: check noise/pedrms  SVEN’s : the ratio distribution is a constant  The width here is due to imperfect correction for different calibration files used

25 July 2005Michel Lefebvre 19 SimpleNoiseToolFromTextFile  A NoiseTool has been written to input noise from a text file  It will be committed very soon, along with Rolf’s improvements to the NoiseTool interface Conclusions and outlook  Noise values have been computed for the EMEC-HEC 2002 TB probably accurate at the 2% level noise/pedrms is not a constant there may still some work required with regards to pathological cells  Thanks to Rolf: new NoiseTool soon available ESD’s for 2002 TB data are being produced and will be made available; with the noise file, the data can then be analysed in Athena