Difference between revisions of "CDC run 2551 drift time fits"
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+ | <pre> | ||
+ | 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 | ||
+ | |||
+ | </pre> | ||
+ | |||
{| border="0" cellpadding="2" | {| border="0" cellpadding="2" | ||
+ | |[[Image:cdc_run2551_straw_496.png|thumb|x200px|Drift time fit for straw 496]] | ||
+ | |[[Image:cdc_run2551_straw_500.png|thumb|x200px|Drift time fit for straw 500]] | ||
+ | |[[Image:cdc_fitshapes.png|thumb|x200px|Drift time fit function]] | ||
+ | |} | ||
+ | |||
+ | Fit statistics from first pass over data with ~5k counts per straw | ||
+ | |||
+ | {| border="0" cellpadding="2" | ||
+ | |[[Image:cdc_run2551_t0.png|thumb|x200px|Drift time fit t0]] | ||
|[[Image:cdc_run2551_fitstatus_tmax.png|thumb|x200px|Drift time fit tmax]] | |[[Image:cdc_run2551_fitstatus_tmax.png|thumb|x200px|Drift time fit tmax]] | ||
+ | |} | ||
+ | |||
+ | {| border="0" cellpadding="2" | ||
+ | |[[Image:cdc_run2551_tmax_par6.png|thumb|x200px|Drift time fit tmax vs parameter 6]] | ||
+ | |[[Image:cdc_run2551_tmax_par8.png|thumb|x200px|Drift time fit tmax vs parameter 8]] | ||
+ | |[[Image:cdc_run2551_par6_par8.png|thumb|x200px|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 | ||
+ | <pre> | ||
+ | T->Scan("N","par6<35&&!status&&entries>100"); >batch.sh | ||
+ | </pre> | ||
+ | |||
+ | <h2>Run 2451</h2> | ||
+ | {| border="0" cellpadding="2" | ||
+ | |+ Hit thresholds 180-100-25, window 44-150 | ||
+ | |- | ||
+ | |[[Image:cdc_run2451_amp.png|thumb|x200px|max amp - pedestal]] | ||
+ | |[[Image:cdc_run2451_ped.png|thumb|x200px|pedestal]] | ||
+ | |[[Image:cdc_run2451_t30.png|thumb|x200px|Drift time fit straws with param 6 < 30]] | ||
+ | |[[Image:cdc_run2451_t30z.png|thumb|x200px|zoomed in]] | ||
|} | |} |
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
Fit statistics from first pass over data with ~5k counts per straw
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