FDC Backgrounds

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FDC

Detector Configuration:

  • Double-Hit Resolution: 250 ns
  • Threshold: 1 keV
  • Strip Threshold: 5 mV
    • Where is this applied? What is assumed about electronics?
  • Maximum Number of Hits: 100
    • Is this at the event level? If so, 100 is probably not large enough.
A plot of the rate as a function of anode wire number for the most dowstream anode plane (blue), the most upstream anode plane (red), and the average rate (black).
A plot of the rate as a function of cathode strip number for the most dowstream cathode plane (blue), the most upstream cathode plane (red), and the average rate (black).
A plot of the rate within 5 cm of the beam axis as a function of the plane number if the FDC. Planes for which N%3 == 2 are anodes, all other planes are cathodes. The notable increase in rate for the downstream chambers could be due to opening of charged particles in the relatively weaker field.
A double-log plot of the energy of all hits in the FDC. The spectrum cuts off at 1 keV due to the GEANT threshold.