gains: set A

Plan:
  1. use real dAu combined trigger events taken with close to optimal timing to determine present gains (i.e. slopes of isolated MIP spectra)
  2. the average slope for tubes in crate 4 (green) for eta bin=4 is of -0.117. Use it as the reference.
  3. use M-C minb dAu events (gains matched to E_T=60 GeV/c) to predict relative change of the slopes of isolated MIP spectra.
  4. predict slope for all eta bins based on M-C shape (see table below)
  5. choose new HV for all tubes, aiming towards +/- 15% slope match
  6. inspect new HV and prepare 'setA' of q-files for HVsys
  7. (try to) take real data for the timing 70/19 70/19 35/19 with both HV sets ('default' and 'setA' ). Possibly 90 minutes each (~180K events)

supporting material for real dAu events

Detailed list of slopes and plots for:
- towers 5TA - 5TC, crate 3 ,
- towers 5TD - 7TB, crate 4 ,
- towers 7TC - 8TE, crate 5 ,
Note, suspecious towers are marked in the first column.

The keword associated with every tube explains basis of the voltage change.
Meaning of key words:

  • manual: algo failed because integral of ADC=[8-40] was below 100 (on average 500-1000) or large error of the slope
  • auto-up/down: algo works, slope used to determin gain change
  • auto-up-reduced : calculated gain change exceeded 2.0, set to 2.0
  • auto-down-reduced : calculated gain change exceeded 0.5, set to 0.5
  • test-up: calculated gain change was 0.85-1.0, set to 1.15
  • test-down: calculated gain change was 1.0-1.15, set to 0.85

    Summary of proposed changes of gains
    key crate 3 crate 4 crate 5
    auto-up/down 20 62 45
    auto-up/down-reduced 7 18 10
    test-up/down 8 22 29
    manual 1 6 12

    Details of 'manual' gain adjustment
    tower gain change remarks
    05TC12 1. or 2. only pedestal seen or very low gain
    05TD04 1. just pedestal is seen, dead ?
    05TD06 2. low gain tube
    05TD10 2. very low gain tube
    05TE03 1. or 2. only pedestal seen or very low gain
    06TA12 1. just pedestal is seen, dead ?
    06TB04 1. dead tube
    07TD04 1. or 2. just pedestal is seen, dead ?
    07TD05 0.74 tube is probably fine !, but noise in 07TD04 kill most of entries
    07TD06 0.66 tube is probably fine !, but noise in 07TE06 kill most of entries. Renne said this tube is dead ?
    07TD08 1.15 tube is probably fine !, but noise in 07TE06 kill most of entries
    07TE06 1. just pedestal is seen, dead ?
    07TE07 0.84 tube is probably fine !, but noise in 07TE06 kill most of entries
    08TA05 0.75 tube is probably fine !, but noise in 07TE06 kill most of entries
    08TA06 1.13 tube is probably fine !, but noise in 07TE06 kill most of entries
    08TA07 1.63 tube is probably fine !, but noise in 07TE06 kill most of entries
    08TB02 1. or 2. dead tube
    08TB07 1. bit0 set to 1? is it possible
    08TD04 1. or 2. dead ?


    supporting material for M-C dAu events

    60K M-C minB dAu events. Towers are gain match for E_T max=60 GeV. Y-axis shows slope of the isolated MIP spectra.
    X-axis numbers 240 towers in sectors 5-8. The physical eta=2.0 is on the left end, eta=1.06 is on the right one. The phi-bins advance with the step of 1 (1=05TA01 , 2=05TB01, ..., 20=08TE01), subsequent eta bins[1-12] increment X-axis by 20 (21=05TA02, 41=05TA03, ..., 221=05TA12).
    Colors denote 3 crates. Horizontal lines is the average over the whole eta bin. +/- 1 sigma of the average are marked by dashed lines.
    plG4mc.C


    eta bin target Fit result
    slope slope +/- error chi2 NDF
    1 -0.19 -0.192 0.00362 51.1194 19
    2 -0.19 -0.195 0.00377 32.1798 19
    3 -0.20 -0.201 0.0039 22.1007 19
    4 -0.21 -0.209 0.00411 18.087 17
    5 -0.20 -0.203 0.00358 14.2585 19
    6 -0.19 -0.18 0.00311 28.2575 19
    7 -0.18 -0.18 0.00299 6.12788 19
    8 -0.175 -0.172 0.00297 37.7176 19
    9 -0.15 -0.153 0.00273 26.7785 19
    10 -0.14 -0.141 0.00259 22.7677 19
    11 -0.13 -0.128 0.00255 18.086 19
    12 -0.13 -0.128 0.00238 20.0598 19