Difference between revisions of "First look at TOF calibration"

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*# calculate Time difference: <math>\Delta t = t^{i}_{TDC}-t^{i}_{ADC}</math>  
 
*# calculate Time difference: <math>\Delta t = t^{i}_{TDC}-t^{i}_{ADC}</math>  
 
*# calculate Integral: I = pulse_integral - pulse_pedestal*nsamples
 
*# calculate Integral: I = pulse_integral - pulse_pedestal*nsamples
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*# [[Image:w.gif|200px|||example of walk correction fit]]
+
*# [[File:walkcorr.gif|200px|||example of walk correction fit]]

Revision as of 09:57, 15 April 2015

First Look

  • first select data sample with the following conditions:
    1. only consider hits within 50ns of the timing peak both for ADC data and TDC data
    2. only consider paddles that have hits on both ends
    3. take care of the 6fold trigger timing shift in the TDC (24ns window)
  • do a rough determination of the walk correction by using the time in the ADC as reference.
    1. calculate Time difference: \Delta t=t_{{TDC}}^{{i}}-t_{{ADC}}^{{i}}
    2. calculate Integral: I = pulse_integral - pulse_pedestal*nsamples
    3. example of walk correction fit
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