DIRC Background Daily Monitoring Plots:
a Demo Page

Last updated: Sunday, November 13, 2005 14:58 (demo page)

Available plots

• Daily Plots
• Lumi and scaler scope plot
• Scaler rate vs. Lumi plot
• Scaler rate ratio vs. Lumi plot
• Neutron scope plot
• Correlation between backward neutron counter and scalers
• Scalarm alarm counters
• Low alarm (300 kHz) counting
• High alarm (400 kHz) counting
• Sector comparision plots
• Current excess
• Current excess small spikes
• Current excess large spikes
• Scaler rates
• Scaler rate ratios
• Scaler rate small spikes
• Scaler rate large spikes
• Bi-Weekly Plots
• Lumi and scaler scope plot
• Scaler rate vs. Lumi plot
• Scaler rate ratio vs. Lumi plot
• Neutron scope plot
• Correlation between backward neutron counter and scalers
• Scaler alarm counters
• Scaler accumulated charges
• Daily and integrated accumulated charges
• Corresponding plots for scaler in sector 3
• Scaler rate and neutron counter parameterization check
• Scaler rate parameterization check

• Daily Plots

  • Lumi and scaler scope plot

    From top to bottom, this plot displays the time evolution of:
    • the HER current (Amp);
    • the LER current (Amp);
    • the luminosity (×10³³);
    • the average scaler rate (kHz);
    • the average scaler rate ratio;
    • the maximum current excess (microAmp) among the 12 HV channels powering the scalers
    during the last 3 shifts.

    

  • Scaler rate vs. Lumi plot

    Average scaler rate (kHz) vs luminosity (×10³³): scatter and profile plots.

    

  • Scaler rate ratio vs. Lumi plot

    Average scaler rate ratio vs luminosity (×10³³): scatter and profile plots.

    

  • Neutron scope plot

    This plot focuses on the three neutron counters. Below the luminosity time-chart, one can see the counter rate (in kHz) and the rate ratio for each of these three counters. The 1rst and the 3rd counters are on the forward side whereas the 2nd one is located on the backward side (i.e. on the DIRC side).

    

  • Correlation between backward neutron counter and scalers

    This plot shows the time correlation between the luminosity variations, the average scaler rate and the 2nd neutron counter (located on the backward side of BaBar) rate.
    Looking at the plots, the correlation between these three variables appears quite obvious.

    

  • Scalarm alarm counters

    • Low alarm (300 kHz) counting

      For each sector, this plot shows the number of times the scaler rate was above 300 kHz (~ yellow alarm level) during the last three shifts. The y-axis on the right converts this number in a fraction of shift by taking into account the OdcNtupleMaker sampling time.

      

    • High alarm (400 kHz) counting

      Same as above, but with a threshold at 400 kHz (~ red alarm level) this time.

  • Sector comparision plots

    These plots aim at comparing the evolution of background quantities in the 12 DIRC sectors to get an idea of the background distribution in Φ.

    • Current excess

      For each sector, this plot shows the current excess in the channel powering the scaler versus the time over a 3-shift duration. The color code is displayed on the right of the plot: sectors are sorted based on the mean value of the current excess to make sure that close quantities are drawn using different colors.
      This convention aims at making clearer the pictures and is used in all the similar plots displayed below.

      

    • Current excess small spikes (above 5 microAmp)

      For each sector, this plot shows the 'density' of excess current spikes above 5 microAmp as a function of time. The fraction is computed over the last 5 minutes.

      

    • Current excess large spikes (above 10 microAmp)

      Same as above, but counting large current excess spikes (above 10 microAmp).

      

    • Scaler rates

      Comparison of the scaler rates (in kHz) in the 12 sectors.

      

    • Scaler rate ratios

      Comparison of the scaler rate ratios in the 12 sectors.

      

    • Scaler rate small spikes (above 300 kHz)

      Density of scaler spikes above 300 kHz in the 12 sectors.

      

    • Scaler rate large spikes (above 400 kHz)

      Density of scaler spikes above 400 kHz in the 12 sectors.

      

• Bi-Weekly Plots

  The 4 first plots have the same structure than the corresponding ones displayed in the daily section. They just cover two weeks instead of one day.

  • Lumi and scaler scope plot

    

  • Scaler rate vs. Lumi plot

    

  • Scaler rate ratio vs. Lumi plot

    

  • Neutron scope plot

    

  • Correlation between backward neutron counter and scalers

    

  • Scaler alarm counters

    These plots show the number of scaler rate alarms per day for two thresholds: 300 kHz (top plot) and 400 kHz (bottom plot). Like for the corresponding daily plots, the y-axis on the right converts these number into day fractions given the OdcNtupleMaker sampling rate.

    

• Scaler accumulated charges

  • Daily and integrated accumulated charges

    For each sector, this table shows an estimate of the charge (per PMT) accumulated by the HV channel which is powering the scaler. These numbers are computed by integrating the excess current (measured current - nominal current @ V0), sampled every second. After the integration, all computed charges are divided by 16 (the number of PMTs per HV channel).

    Sector	Daily charge (μC)	Integrated charge (C)
    0	2738	0.008
    1	8039	0.021
    2	8307	0.021
    3	11744	0.032
    4	5547	0.016
    5	10376	0.026
    6	3429	0.010
    7	462	0.002
    8	137	0.001
    9	9155	0.024
    10	98	0.001
    11	246	0.001

  • Corresponding plot for scaler in sector 3

    Because of the injection pattern, the scaler in sector 3 is recording the highest rate among all 12 scalers.

    

• Scaler rate and neutron counter parameterization check

  • Scaler rate parameterization check

    For each sector, this picture provides the profile plot 'scaler rate ratio vs. scaler rate'. It aims at showing how the 12 linear parameterizations of the scaler rates work on an extended range of scaler rates. If things would be perfect, the 12 plots should be flat. Deviations from that behavior means either that the model does not describe well enough the data or that the background components evolve with the scaler rates.

    

For any comment/question regarding this page, just send an e-mail to Nicolas Arnaud