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Another look to the BGO matrix calibration C.Voena INFN Roma

Another look to the BGO matrix calibration C.Voena INFN Roma. Signal windows in OSC waveform analysis. As in the paper, event by-event for PMT i (start of signal is determined from average time profile): Q i = Integral[0,115]ns S i = Integral[50,115]ns

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Another look to the BGO matrix calibration C.Voena INFN Roma

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  1. Another look to the BGO matrixcalibration C.Voena INFN Roma

  2. Signal windows in OSC waveform analysis • As in the paper, event by-event for PMTi • (start of signal is determined from average time profile): • Qi = Integral[0,115]ns • Si = Integral[50,115]ns • Ci = Integral[0,16]ns-0.27*Si mV S2 S1 In the paper S1/S2 is assumed to be 20% on the basis of 2007 results S1/S2=27% sample

  3. Qsum(=Q1+Q2+Q3+Q4) distributions (50 GeV) central beam position Qsum Long tail at low total energy

  4. Qsum and Q1 dependence on DownStream BC Y(tdc counts) Y(tdc counts) Qsum Q1 - Strange distributions at Y>0 and for some runs also at Y<200 and Y>-200 (Y= vertical coordinate of downstream beam chamber) - The tails of Qsum distribution are concentrated at Y>0 Cut at Y<0 and Y>-200 in what follows

  5. Calibration procedure using Qi: minimize resolution Intercalibration constants k1i of all runs at 10-20-30-50-100-150-200 GeV at the three different position (21 runs) by minimizing: j=run number Overall calibration constant k from run at 50 GeV in position c

  6. Results for Qsum in central beam position Linearity /E(GeV) Resolution 0.30/√E(GeV)+1.3% -1/√E(GeV) E(GeV)

  7. Calibrated Qsum distribution at 50GeV (central p.) Qsum

  8. Results for Qsum in beam position b) Linearity Resolution /E(GeV) 0.31/√E(GeV)+0.5% -1/√E(GeV) E(GeV) - Very non uniform behavior with respect to central position - beam position a) is in better agreement with central beam position - Minimizing linearity for all runs brings mean linearity in 0.8-1.2 range for all positions

  9. Results for Cerenkov signal in central beam position Linearity /E(GeV) Resolution 0.42/√E(GeV)+2% E(GeV) -1/√E(GeV) - Optimizing the inter-calibration constants separatly for C and S improve resolution of few %.

  10. Results for scintillation signal in central beam position Linearity /E(GeV) Resolution 0.47/√E(GeV)+1% -1/√E(GeV) E(GeV) - Optimizing the inter-calibration constants separatly for C and S improve resolution of few %.

  11. Summary • - BGO matrix calibrated by minimizing the resolution • at all energies • - Low energy tails removed to apply this procedure • - Resolutions for beam in central position • - Linearity at <5% level except at 10GeV and 20-30 GeV • for Cerenkov signal • - Very different response when beam is sent in position c) • - Some improvement in resolution with respect to approach • that minimizes linearity but worse linearity for Cerenkov • signal C:0.42/√E(GeV)+2% Q:0.30/√E(GeV)+0.5% S:0.47/√E(GeV)+2%

  12. Backup

  13. Qsum distributions (50 GeV)

  14. Distributions(50)

  15. Distributions(20)

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