Bool_t AliT0CalibWalk::MakeWalkCorrGraph(const char *laserFile)
{
//make walk corerction for preprocessor
- Int_t npeaks = 20;
- Int_t sigma=3;
- Bool_t down=false;
- Int_t index[20];
+ Float_t sigma, xp, cfdmean, qtmean, ledmean;
Bool_t ok=true;
- Float_t mips[20];
- Int_t nfound=0;
+ Float_t mips[50];
gFile = TFile::Open(laserFile);
if(!gFile) {
TH1F *hCFD = (TH1F*) gFile->Get(cfd.Data()) ;
TH1F *hLED = (TH1F*) gFile->Get(led.Data());
TH1F *hQTC = (TH1F*) gFile->Get(qtc.Data()) ;
- hCFD->SetDirectory(0);
- hQTC->SetDirectory(0);
- hLED->SetDirectory(0);
+ // hCFD->SetDirectory(0);
+ // hQTC->SetDirectory(0);
+ // hLED->SetDirectory(0);
if(!hCFD )
AliWarning(Form(" no CFD data in LASER DA for channel %i for amplitude %f MIPs",i,mips[im]));
if(!hQTC )
AliWarning(Form(" no QTC correction data in LASER DA for channel %i for amplitude %f MIPs",i,mips[im]));
if(!hLED)
AliWarning(Form(" no LED correction data in LASER DA for channel %i for amplitude %f MIPs",i,mips[im]));
-
- if(hCFD ) {
- TSpectrum *s = new TSpectrum(2*npeaks,1);
- nfound = s->Search(hCFD,sigma," ",0.1);
- if(nfound!=0){
- Float_t *xpeak = s->GetPositionX();
- TMath::Sort(nfound, xpeak, index,down);
- Float_t xp = xpeak[index[0]];
- Double_t hmax = xp+3*sigma;
- Double_t hmin = xp-3*sigma;
- hCFD->GetXaxis()->SetRangeUser(hmin-10,hmax+10);
- }
- else
- {
- hCFD->Rebin(2);
- TSpectrum *s1 = new TSpectrum(2*npeaks,1);
- nfound = s1->Search(hCFD,sigma," ",0.1);
- if(nfound!=0){
- Float_t *xpeak = s1->GetPositionX();
- TMath::Sort(nfound, xpeak, index,down);
- Float_t xp = xpeak[index[0]];
- Double_t hmax = xp+3*sigma;
- Double_t hmin = xp-3*sigma;
- hCFD->GetXaxis()->SetRangeUser(hmin-10,hmax+10);
- }
- else
- {
- ok=false;
- printf("no peak in CFD spectrum for PMT %i amplitude %i\n",i,im);
- return ok;
- }
-
- }
-
- if (im == 0) cfd0[i] = hCFD->GetMean();
- y1[im] = hCFD->GetMean() - cfd0[i];
- }
- if( hQTC) {
- x1[im] = hQTC->GetMean();
- if( x1[im] == 0) {
+
+ if(hCFD && hCFD->GetEntries()>500) {
+ GetMeanAndSigma(hCFD, xp, sigma);
+ }
+ else
+ {
ok=false;
- printf("no peak in QTC signal for PMT %i amplitude %i\n",i,im);
+ printf("no peak in CFD spectrum for PMT %i amplitude %i\n",i,im);
return ok;
+ }
+
+ if (hCFD->GetRMS() < 1.5) cfdmean = hCFD->GetMean();
+ else cfdmean=xp;
+ if (im == 0) cfd0[i] = cfdmean;
+ y1[im] = cfdmean - cfd0[i];
+
+ if(hQTC && hQTC->GetEntries()>500) {
+ GetMeanAndSigma(hQTC, qtmean, sigma);
+
+ x1[im] = qtmean;
+ if( x1[im] == 0) {
+ ok=false;
+ printf("no peak in QTC signal for PMT %i amplitude %i\n",i,im);
+ return ok;
}
- }
-
- if( hLED){
- TSpectrum *s = new TSpectrum(2*npeaks,1);
- nfound = s->Search(hLED,sigma," ",0.1);
- if(nfound!=0){
- Float_t *xpeak = s->GetPositionX();
- TMath::Sort(nfound, xpeak, index,down);
- Float_t xp = xpeak[index[0]];
- Double_t hmax = xp+10*sigma;
- Double_t hmin = xp-10*sigma;
- hLED->GetXaxis()->SetRangeUser(hmin-10,hmax+10);
}
+
+ if( hLED && hLED->GetEntries()>500) {
+ GetMeanAndSigma(hLED, ledmean, sigma);
+ }
else
{
ok=false;
printf("no peak in LED spectrum for PMT %i amplitude %i\n",i,im);
return ok;
}
- x2[im] = hLED->GetMean();
+ x2[im] = ledmean;
xx2[im] = x2[nmips-im-1];
- }
- xx[im]=mips[im];
-
- if (hQTC) delete hQTC;
- if (hCFD) delete hCFD;
- if (hLED) delete hLED;
+
+ xx[im]=mips[im];
+ if (hQTC) delete hQTC;
+ if (hCFD) delete hCFD;
+ if (hLED) delete hLED;
+
}
for (Int_t imi=0; imi<nmips; imi++)
return ok;
}
+void AliT0CalibWalk::GetMeanAndSigma(TH1F* hist, Float_t &mean, Float_t &sigma)
+{
+
+ const double window = 5.; //fit window
+ double norm = hist->Integral(); // normalize to one count
+ hist->Scale(1./norm);
+
+ double meanEstimate, sigmaEstimate;
+ int maxBin;
+ maxBin = hist->GetMaximumBin(); //position of maximum
+ meanEstimate = hist->GetBinCenter( maxBin); // mean of gaussian sitting in maximum
+ sigmaEstimate = hist->GetRMS();
+ TF1* fit= new TF1("fit","gaus", meanEstimate - window*sigmaEstimate, meanEstimate + window*sigmaEstimate);
+ fit->SetParameters(hist->GetBinContent(maxBin), meanEstimate, sigmaEstimate);
+ hist->Fit("fit","RQ","Q");
+
+ mean = (Float_t) fit->GetParameter(1);
+ sigma = (Float_t) fit->GetParameter(2);
+
+ delete fit;
+}