Correlation between gain(MIP) and inverse slope

  • Data from:
    * ramp-run 6049127, 735K eve, no trig selection. E:B=3:1
    * MIP found using UxV method: details .
  • GausLand fit to MIP spectra for 60 towers from sector 5 ( PDF )
  • Absolute gains(MIP) for sector 5, after ped correction table
  • relative gains from slopes table

    Results for sector 5

    Fig 1 shows odd eta bins with different symbols. Vertical and horizontal lines denote weighted averages (for X and Y) for each eta bin. 6 bars in X-axis mark ideal gains (60 GeV ET @ 4094 ADC).
    Tower 5TE03 (most left green) was also not working last year. Now its gains is 20% too low.

    Fig 2 shows even eta bins.
    Tower 5TD10 is top right. It was not working last year, its initial HV in 2005 was random and gain 2.5 too high, first HV iteration reduced gain but it is still 30% too high.

    Scripts :
    *
    compSect5.C - displays plots above

    Numerical values for ideal detector calibrated 60GeV ET @ 4096 ADC

                   (ch/GeV)       reco (GeV)
    bin=1 eta=1.95 idealG=19.04 MipEne=0.360 MipAdc=6.9
    bin=2 eta=1.86 idealG=20.85 MipEne=0.363 MipAdc=7.6
    bin=3 eta=1.76 idealG=22.70 MipEne=0.367 MipAdc=8.3
    bin=4 eta=1.67 idealG=24.70 MipEne=0.371 MipAdc=9.2
    bin=5 eta=1.59 idealG=26.72 MipEne=0.376 MipAdc=10.0
    bin=6 eta=1.51 idealG=28.75 MipEne=0.382 MipAdc=11.0
    bin=7 eta=1.43 idealG=30.76 MipEne=0.388 MipAdc=11.9
    bin=8 eta=1.37 idealG=32.73 MipEne=0.394 MipAdc=12.9
    bin=9 eta=1.30 idealG=34.63 MipEne=0.402 MipAdc=13.9
    bin=10 eta=1.24 idealG=36.60 MipEne=0.410 MipAdc=15.0
    bin=11 eta=1.17 idealG=38.64 MipEne=0.420 MipAdc=16.2
    bin=12 eta=1.12 idealG=40.41 MipEne=0.429 MipAdc=17.4