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FGT timing 1

Updated on Mon, 2012-02-06 15:29. Originally created by balewski on 2012-02-05 16:06.

 We took 3 data sets with  fixed APV timing latency measured in 1/4 of RHIC clock ticks

timing data taken on Feb 5
latency run no

JPlot

(pg34-36)

 Remark
60 13036040 here first try
64 13036072 here Best guess
66 13036073 here too late on purpose

3 attachemnts show all found pulses passing initial criteria ('pulses'), distribution of shap fit params vs. APV chip ('apv'), and selecton of valid pulses per FGT quadrant ('quad') 

Selection criteria for a puls to be processed (all other were simply ignored)

  • status of the strip had to be 0 (good pedestal)  and it didn't get caught by oscillation and saturation filters. 
  • at least one ADC > ped+600 
  • fitted shape f(t,t0,tau,ampl) = ampl*(t-t0)^2*exp(-(t-t0)/tau)  , see last two attachments for visualisation

Fig 1.  Typical time shapes found by Len, 1 time bin has ~27 ns length

Fig 2. Accumulated raw spectra for FGT disc 1, for 'best' timing of 64 , run 13036072

Added:

Pulse shapes for formula with varied power of t  and fixed tau and t0:

f(t,t0,tau,ampl) = a*(t-t0)^p*exp(-(t-t0)/tau)  (+b)

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