Difference between revisions of "CDC run 2016 drift time fits"
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{| border="0" cellpadding="2" | {| border="0" cellpadding="2" | ||
− | + | |[[Image:cdc_run2016_time.png|thumb|x200px|time vs straw number n]] | |
− | |[[Image: | + | |[[Image:cdc_run2016_tz.png|thumb|x200px|time vs n (expanded)]] |
− | |[[Image: | + | |[[Image:cdc_run2016_t460470.png|thumb|x200px|time for straws 460 and 470]] |
− | |[[Image: | + | |[[Image:cdc_run2016_tzz.png|thumb|x200px|time vs n (expanded more)]] |
− | |[[Image: | + | |
|} | |} | ||
+ | |||
+ | The early channels are from HVB C8: roc 28, slot 15, channels 48-71; ring 8 straws 53-60, ring 9 straws 62-69 and ring straws 61-68; the time difference is ~ 5 samples (40ns). | ||
+ | |||
{| border="0" cellpadding="2" | {| border="0" cellpadding="2" | ||
− | |[[Image: | + | |+ drift time fits for a few straws from run 2016 (cosmics, magnet off) |
− | |[[Image: | + | |[[Image:cdc_dtfit496.png|thumb|x200px|straw 496 (I12) t0 424ns tmax 998ns tdiff 574ns ]] |
− | |[[Image: | + | |[[Image:cdc_dtfit497.png|thumb|x200px|straw 497 (I13) t0 422ns tmax 988ns tdiff 566ns ]] |
− | |[[Image: | + | |[[Image:cdc_dtfit498.png|thumb|x200px|straw 498 (I14) t0 424ns tmax 983ns tdiff 558ns]] |
+ | |[[Image:cdc_dtfit499.png|thumb|x200px|straw 499 (I15) t0 423ns tmax 841ns fall-off is too slow]] | ||
|} | |} | ||
+ | |||
+ | <pre> | ||
+ | TF1 *f = new TF1("f","[0]*(1+[1]*exp(([3]-x)/[2])+[7]*exp(([3]-x)/[8]))/((1+exp(([3]-x)/[5]))*(1+exp((x-[4])/[6])))",400,1400); | ||
+ | f->SetParameter(0,20); //overall height | ||
+ | f->SetParameter(1,20); //amplitude of first exp contrib to peak | ||
+ | f->SetParameter(2,10); //first exp fall-off | ||
+ | f->SetParameter(3,550); //t0 | ||
+ | f->SetParameter(4,1200); //tmax | ||
+ | f->SetParameter(5,2); //slope up of t0 edge | ||
+ | f->SetParameter(6,5); //slope down of tmax edge | ||
+ | f->SetParameter(7,3); //amplitude of first second contrib to peak | ||
+ | f->SetParameter(8,100); //second exp fall-off | ||
+ | </pre> | ||
{| border="0" cellpadding="2" | {| border="0" cellpadding="2" | ||
|[[Image:cdc_run2016_amp.png|thumb|x50px|amplitude vs n]] | |[[Image:cdc_run2016_amp.png|thumb|x50px|amplitude vs n]] | ||
|} | |} |
Latest revision as of 13:51, 8 January 2015
The early channels are from HVB C8: roc 28, slot 15, channels 48-71; ring 8 straws 53-60, ring 9 straws 62-69 and ring straws 61-68; the time difference is ~ 5 samples (40ns).
TF1 *f = new TF1("f","[0]*(1+[1]*exp(([3]-x)/[2])+[7]*exp(([3]-x)/[8]))/((1+exp(([3]-x)/[5]))*(1+exp((x-[4])/[6])))",400,1400); f->SetParameter(0,20); //overall height f->SetParameter(1,20); //amplitude of first exp contrib to peak f->SetParameter(2,10); //first exp fall-off f->SetParameter(3,550); //t0 f->SetParameter(4,1200); //tmax f->SetParameter(5,2); //slope up of t0 edge f->SetParameter(6,5); //slope down of tmax edge f->SetParameter(7,3); //amplitude of first second contrib to peak f->SetParameter(8,100); //second exp fall-off