CDC run 2551 drift time fits

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