Estimation of the number of strips fired (before and after pedestal&noise substraction) in Simulation

I generate 20 events for each file with a number of pions in a given pt,phi,rapidity range.

The kumac is :

detp geom y2006b

make geometry

gclose all

debug on

user/vsig 0 20

gkine 20 8 0.1 5.0 -1.0 1.0 -3.1415 3.1415 -30 30

trig 20

The number of pions goes from 50 to 800 pions /event.

The following plot show the number of strips before (red) and after pedestal substraction (blue)

• 50 pions per event
• 
• 100 pions per event
• 
• 300 pions per event
• 
• 500 pions per event
• 
• 800 pions per event
•  

 Each GEANT hit can induce signal on 4 consecutives strips.

Then for 800 pions, it gives # strips = 800 * 4 *2 (side P and N) = 6400

This result in agreement with the red histos (figure above)

A rough estimation of the ratio (#strips after ped & noise susbtraction)/(#strips before) = 1/3