Slope Analysis Procedure
(HV input = setB --> HV output = setC)


  • Tag all Towers in 5TA-8TE which should not be included in average. In total 21 towers were rejected. They can be lumped into the following categories:
    1. No 2003 Calibration -
      5TC12,5TD04(PMT9),5TD10(PMT3),6TA12,6TB04,6TC09,7TB09,7TD08,8TD04,8TD08,8TE04,8TE12
    2. No Led Response in Time Ordered Tests -
      5TD10(PMT3),5TE03(PMT10),6TB04,6TB07,6YC09,6TD10
    3. GUI lists as "BAD" (ie Red) -
      5TE03(PMT10),7B09,7D08,7E07,6B04,6B07,6C09,6D10,6D11
    4. Review of Spectra reveal sticky bits or abnormal spectrum -
      5TD10(PMT3),5TE03(PMT10),6TA03,6TA07,6TB04,6TB07,6TC09,6TD10,7TB09,7TD08,7TE07,8TB07,8TD04
  • Find Average of Remaining Good Tower slopes in 5TA-8TE for each ETA bin (bin = 1 for Tower =1 for eta = 2, bin = 12 for Tower =12 for eta =1 ). Review of the individual slopes for ETA BIN=3 doesn't reveal any pattern to explain the large deviation from the otherwise smooth curve extending from 1-12.



    ETA Bin AVE Slope ERR
    1 -0.236950 0.002600
    2 -0.239550 0.003385
    3 -0.202056 0.002979
    4 -0.213375 0.003129
    5 -0.201250 0.002710
    6 -0.186150 0.002483
    7 -0.169563 0.002537
    8 -0.161389 0.002180
    9 -0.145176 0.002103
    10 -0.132278 0.002369
    11 -0.124632 0.002141
    12 -0.126529 0.001870


    Slope Distribution for Calibrated and UnCalibrated Towers for each ETA Bin (click to enlarge): The gray(red) spectra on the right(left) is the slope distribution of the calibrated(uncalibrated) towers only.



    Slope Summary File here . Contains Eta bin slope averages and projected Gain changes for each tower.

    HVset_C Voltages were calculated using the above slopes and Eta bin averages. NOTE: Before this calculation was done the PMT labels were switched for 3 pairs of tubes in HVset_iv_B voltages. Only the labels were changed (base id,max DAQ value and HV all move together):

    PMT Bin SET B BASE ID SET C BASE ID
    P08TD08 20068 20069
    P08TD09 20069 20068
    P10TA07 22031 22032
    P10TA08 22032 22031
    P12TA07 31 32
    P12TA08 32 31
    P01TA04 88 89
    P01TA05 89 88


    HV summary file for HVsetB2C here . Contains Tower,Tube,slope,gain change and HV sets. A Flag is given to each tower which describes the status.
    FLAG Description
    1 Tower was calibrated in 2003 run -- HV NEVER CHANGES
    -1 Tower in 5TA-8TE but not calibrated by 2003. Slope still deviates by more than 5% from ETA bin average -- New HV calculated
    10 Slope for this tower is within 5% of Eta Bin Ave
    -10 Dead Tube - slope==0/abnormal spectrum/sticky bit -- HV stays the same
    0 Tower located outside of 5TA-8TE and slope deviates by more than 5% from ETA bin average -- New HV calculated.


    ____________________________________________________________________________ ____________________________________________________________________________ Macros used in this analysis are located on the rcas at /star/u/eemcdb/2004/HVchangeRun4/slope/SlopeMatch.C and VoltTune.C.