COT Analog Signal Workbook

• Plots from recent discussion of analog monitor status.
• Intrinisic noise: HV on. No TDC hit on given wire.
• Noise in "quiet" environment: HV on. No TDC hit on adjacent analog monitor channel.
• TDC/ADC correlations (time; width).
• Signal gallery: examples of crosstalk for nearby channels. Outputs 0-2 are adjacent at the chamber to the mux input; outputs 3-5 are adjacent from the mux output to the FADC input[1/2/3].
(Turn off antialias to see datapoints.)
• Attenuation: SPICE simulations of pulses at [chip input/ shaper output/ blr output] in ASD from near and far end of the wire.
  
• Goals outlined during discussion (email)

  Demonstrate analog signal quality at 96 locations within the detector.
  Study analog basis for multiple discriminator pulses associated with a single tracks.
  Study ionizing track signal shapes, their relationship to discriminator output width and perhaps help optimize ASDQ control voltage settings.  
  
  Additional information in the near term that would be useful includes:
   1. Calibration
     a. Better understanding of amplitude calibration. 
        Sample of ADC sweeps just below and just over threshold.  Several plots may help us classify signal shapes.
     b. Test Pulse injector signals.   
        Peak amplitude and RMS (of peak) for various charge inputs.
        Data might be 100 to 1000 pulses at several different values of Tref. 
        ADC  peak vs  T(width).
   
   2. Reconstructed Track Data 
     ~100 ADC plots with available Data  T(width), path length and dist from wire
      would be interesting if available for minimum ionizing tracks.
  
      ADC peak vs T(width) scatter plot.
      
   3. More info on noise: Analog plots with and without discriminator
      triggers.  
      IF possible:
         RMS noise distribution and plots  with HV 400V lower than nom and off.
                
    Since this information may be useful for reference when conditions
    have changed. It would be good to keep a record of the HV and control voltage
    settings with the plots or in some handy reference table. 
  

• More plots: Analog signals associated with track parameters.