Difference between revisions of "CDC run 2551 drift time fits"

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<h2>Run 2451</h2>
 
<h2>Run 2451</h2>
 
{| border="0" cellpadding="2"  
 
{| border="0" cellpadding="2"  
−
|-Hit thresholds 180-100-25, window 44-150
+
|+ Hit thresholds 180-100-25, window 44-150
 +
|-
 
|[[Image:cdc_run2451_amp.png|thumb|x200px|max amp - pedestal]]
 
|[[Image:cdc_run2451_amp.png|thumb|x200px|max amp - pedestal]]
 
|[[Image:cdc_run2451_ped.png|thumb|x200px|pedestal]]
 
|[[Image:cdc_run2451_ped.png|thumb|x200px|pedestal]]

Latest revision as of 13:03, 26 March 2015

Fit function: 
  TF1 *g2 = new TF1("g2","[0] * (1 + [1]*exp(([3]-x)/[2]) + [7]*exp(([3]-x)/[8]) ) / ( (1+exp(([3]-x)/[5])) * (1+exp((x-[4])/[6])) )");

  [0] overall height
  [1] amplitude of 1st exp contrib to peak
  [2] first exp fall-off
  [3] t0
  [4] tmax
  [5] slope up of t0 edge
  [6] slope down of tmax edge
  [7] amplitude of 2nd exp contrib to peak
  [8] second exp fall-off
Drift time fit for straw 496
Drift time fit for straw 500
Drift time fit function

Fit statistics from first pass over data with ~5k counts per straw

Drift time fit t0
Drift time fit tmax
Drift time fit tmax vs parameter 6
Drift time fit tmax vs parameter 8
Drift time fit parameter 6 vs parameter 8

Second pass over data for straws with a successful fit, tmax edge slope < 35 and number of hits > 100 

 
T->Scan("N","par6<35&&!status&&entries>100"); >batch.sh

Run 2451

Hit thresholds 180-100-25, window 44-150
max amp - pedestal
pedestal
Drift time fit straws with param 6 < 30
zoomed in
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