Analysis of an Existing Root File

An existing root file can be plotted/analysed in this TAB. There is a TCanvas embedded in the TAB and different characteristic histograms can be plotted there. The output root files from the TT6Client as well as from the HybridDialog GUI of the Lyon Software can be analysed here.

There are three different ways to plot histograms. A specific type can be selected in the "Plot Types" frame. The available options are,

The histogram to be plotted can be selected in the "pull down menu", "Histogram Type". The list of the quantities are

  1. Pedestal

  2. Raw Noise

  3. Common Mode Subtracted Noise

  4. Common Mode

  5. Calibration Charge with of Time

    [can ONLY be plotted for "One APV at a Time" or "More Than One APV at a Time"]


  6. Maximum Charge for Strips

  7. Rise Time for Strips

One can also analyse Pedestal, Raw Noise, Common Mode Subtracted Noise, and Maximum Calibration charge to define a strip to be good or not. To do that one needs to load a root file using "Load File" button (if it is not already open). Then "Analyse Bad Channel" button should be clicked. After the analysis a distribution of "Strip Flags" as a function of Strip Number. At the same time a window would pop-up which would show the strip numbers and corresponding "Strip Flags" which are marked as BAD. These numbers are also stored in a text file with the same name as the root file but with extension ".out". The "Strip Flags" is defined with an interger number with 4 LSBs. The 0th bit in set to ON if the Pedestal value is out of the defined region. Similarly 1st, 2nd and 3rd bits signify Raw Noise , Common Mode Subtracted Noise and Maximum Calibration Charge respectively. The accepted regions of these quatities are defined in three ways
  1. by some percent (+- X%) with respect to the mean value of the corresponding distribution.

  2. by number of sigmas (r.m.s) with respect to the mean value of the corresponding distribution

  3. by absolute numbers

The type of the cut is selected using " "Cut Type" variable which can have values 1/2/3 depending on above types. The "Cut Type" and individual cut values for different quantities can be selected in a "Transient Window" .