Difference between revisions of "FDC Backgrounds"

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(Detector Configuration)
(Detector Configuration)
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* Strip Threshold:  5 mV  
 
* Strip Threshold:  5 mV  
 
* Maximum Number of Hits:  100
 
* Maximum Number of Hits:  100
* %red% A software cut has been made to discard hits with radius < 3.5 cm
+
* ''A software cut has been made to discard hits with radius < 3.5 cm''
  
 
== Items for Discussion ==
 
== Items for Discussion ==

Revision as of 17:02, 15 January 2007

Back to Background Rate Studies


Detector Configuration

  • Double-Hit Resolution: 250 ns
  • Threshold: 1 keV
  • Strip Threshold: 5 mV
  • Maximum Number of Hits: 100
  • A software cut has been made to discard hits with radius < 3.5 cm

Items for Discussion

  • These rates seem incredibly high.
  • Is the maximum number of hits coded into the simulation sufficient for the FDC? If it is applied at the event level, 100 hits is probably not enough.
  • How relevant is the increased background as a function of downstream position of the package?
    • Does this need to be considered when optimizing package placement?
    • Do/Should the dead regions for each package vary in size depending on downstream location?


Plots

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.