+Int_t AliVZERODigitizer::Cell2Pmt(Int_t cell) const
+{
+ // The method maps the scintillator
+ // indexes to the PM ones
+ if (cell < 0 || cell >= 80) {
+ AliError(Form("Wrong VZERO cell index %d",cell));
+ return -1;
+ }
+ if (cell < 16) return cell;
+ if (cell < 48) return 8 + cell/2;
+ return cell - 16;
+}
+
+void AliVZERODigitizer::DigitizeHits()
+{
+ // Digitize the hits to the level of
+ // SDigits (fTime arrays)
+
+ for(Int_t i = 0 ; i < 64; ++i) {
+ memset(fTime[i],0,fNBins[i]*sizeof(Float_t));
+ fLabels[i][0] = fLabels[i][1] = fLabels[i][2] = -1;
+ }
+ Float_t integral = fPMResponse->Integral(-kPMRespTime,2.*kPMRespTime);
+ Float_t meansPhE = fSinglePhESpectrum->Mean(0,20);
+
+ AliLoader* loader = fVZERO->GetLoader();
+ if (!loader) {
+ AliError("Can not get VZERO Loader!");
+ return;
+ }
+ loader->LoadHits();
+ TTree* treeH = loader->TreeH();
+ if (!treeH) {
+ AliError("Cannot get TreeH!");
+ return;
+ }
+ TClonesArray* hits = fVZERO->Hits();
+
+// Now makes Digits from hits
+ Int_t nTracks = (Int_t) treeH->GetEntries();
+ for (Int_t iTrack = 0; iTrack < nTracks; iTrack++) {
+ fVZERO->ResetHits();
+ treeH->GetEvent(iTrack);
+ Int_t nHits = hits->GetEntriesFast();
+ for (Int_t iHit = 0; iHit < nHits; iHit++) {
+ AliVZEROhit* hit = (AliVZEROhit *)hits->UncheckedAt(iHit);
+ Int_t nPhot = hit->Nphot();
+ Int_t cell = hit->Cell();
+ Int_t pmt = Cell2Pmt(cell);
+ if (pmt < 0) continue;
+ Int_t trackLabel = hit->GetTrack();
+ for(Int_t l = 0; l < 3; ++l) {
+ if (fLabels[pmt][l] < 0) {
+ fLabels[pmt][l] = trackLabel;
+ break;
+ }
+ }
+ Float_t dt_scintillator = gRandom->Gaus(0,kIntTimeRes);
+ Float_t t = dt_scintillator + 1e9*hit->Tof();
+ if (pmt < 32) t += kV0CDelayCables;
+ t += fHptdcOffset[pmt];
+ Int_t nPhE;
+ Float_t prob = fCalibData->GetLightYields(pmt)*fPhotoCathodeEfficiency; // Optical losses included!
+ if (nPhot > 100)
+ nPhE = (Int_t)gRandom->Gaus(prob*Float_t(nPhot)+0.5,
+ sqrt(Float_t(nPhot)*prob*(1.-prob)));
+ else
+ nPhE = gRandom->Binomial(nPhot,prob);
+ Float_t charge = TMath::Qe()*fPmGain[pmt]*fBinSize[pmt]/integral;
+ for (Int_t iPhE = 0; iPhE < nPhE; ++iPhE) {
+ Float_t tPhE = t + fSignalShape->GetRandom(0,fBinSize[pmt]*Float_t(fNBins[pmt]));
+ Float_t gainVar = fSinglePhESpectrum->GetRandom(0,20)/meansPhE;
+ Int_t firstBin = TMath::Max(0,(Int_t)((tPhE-kPMRespTime)/fBinSize[pmt]));
+ Int_t lastBin = TMath::Min(fNBins[pmt]-1,(Int_t)((tPhE+2.*kPMRespTime)/fBinSize[pmt]));
+ for(Int_t iBin = firstBin; iBin <= lastBin; ++iBin) {
+ Float_t tempT = fBinSize[pmt]*(0.5+iBin)-tPhE;
+ fTime[pmt][iBin] += gainVar*charge*fPMResponse->Eval(tempT);
+ }
+ } // ph.e. loop
+ } // hit loop
+ } // track loop
+ loader->UnloadHits();
+}
+
+
+void AliVZERODigitizer::DigitizeSDigits()
+{
+ // Digitize the fTime arrays (SDigits) to the level of
+ // Digits (fAdc arrays)
+ for(Int_t i = 0 ; i < 64; ++i) {
+ for(Int_t j = 0; j < kNClocks; ++j) fAdc[i][j] = 0;
+ fLeadingTime[i] = fTimeWidth[i] = 0;
+ }
+
+ Float_t maximum = 0.9*fSignalShape->GetMaximum(0,200); // Not exact, one needs to do this on the convoluted
+ Float_t integral2 = fSignalShape->Integral(0,200); // function. Anyway the effect is small <10% on the 2.5 ADC thr
+ for (Int_t ipmt = 0; ipmt < 64; ++ipmt) {
+ Float_t thr = fCalibData->GetCalibDiscriThr(ipmt,kFALSE)*kChargePerADC*maximum*fBinSize[ipmt]/integral2;
+ Bool_t ltFound = kFALSE, ttFound = kFALSE;
+ for (Int_t iBin = 0; iBin < fNBins[ipmt]; ++iBin) {
+ Float_t t = fBinSize[ipmt]*Float_t(iBin);
+ if (fTime[ipmt][iBin] > thr) {
+ if (!ltFound && (iBin < fNBinsLT[ipmt])) {
+ ltFound = kTRUE;
+ fLeadingTime[ipmt] = t;
+ }
+ }
+ else {
+ if (ltFound) {
+ if (!ttFound) {
+ ttFound = kTRUE;
+ fTimeWidth[ipmt] = t - fLeadingTime[ipmt];
+ }
+ }
+ }
+ Float_t tadc = t - fClockOffset[ipmt];
+ Int_t clock = kNClocks/2 - Int_t(tadc/25.0);
+ if (clock >= 0 && clock < kNClocks)
+ fAdc[ipmt][clock] += fTime[ipmt][iBin]/kChargePerADC;
+ }
+ AliDebug(1,Form("Channel %d Offset %f Time %f",ipmt,fClockOffset[ipmt],fLeadingTime[ipmt]));
+ Int_t board = AliVZEROCalibData::GetBoardNumber(ipmt);
+ if (ltFound && ttFound) {
+ fTimeWidth[ipmt] = fCalibData->GetWidthResolution(board)*
+ Float_t(Int_t(fTimeWidth[ipmt]/fCalibData->GetWidthResolution(board)));
+ if (fTimeWidth[ipmt] < Float_t(kMinTDCWidth)*fCalibData->GetWidthResolution(board))
+ fTimeWidth[ipmt] = Float_t(kMinTDCWidth)*fCalibData->GetWidthResolution(board);
+ if (fTimeWidth[ipmt] > Float_t(kMaxTDCWidth)*fCalibData->GetWidthResolution(board))
+ fTimeWidth[ipmt] = Float_t(kMaxTDCWidth)*fCalibData->GetWidthResolution(board);
+ }
+ }
+
+ fEvenOrOdd = gRandom->Integer(2);
+ for (Int_t j=0; j<64; ++j){
+ for (Int_t iClock = 0; iClock < kNClocks; ++iClock) {
+ Int_t integrator = (iClock + fEvenOrOdd) % 2;
+ AliDebug(1,Form("ADC %d %d %f",j,iClock,fAdc[j][iClock]));
+ fAdc[j][iClock] += gRandom->Gaus(fAdcPedestal[j][integrator], fAdcSigma[j][integrator]);
+ }
+ }
+
+}
+
+void AliVZERODigitizer::WriteDigits(AliLoader *loader)
+{
+ // Take fAdc arrays filled by the previous
+ // method and produce and add digits to the digit Tree
+
+ loader->LoadDigits("UPDATE");
+
+ if (!loader->TreeD()) loader->MakeTree("D");
+ loader->MakeDigitsContainer();
+ TTree* treeD = loader->TreeD();
+ DigitsArray();
+ treeD->Branch("VZERODigit", &fDigits);
+
+ Short_t *chargeADC = new Short_t[kNClocks];
+ for (Int_t i=0; i<64; i++) {
+ for (Int_t j = 0; j < kNClocks; ++j) {
+ Int_t tempadc = Int_t(fAdc[i][j]);
+ if (tempadc > 1023) tempadc = 1023;
+ chargeADC[j] = tempadc;
+ }
+ AddDigit(i, fLeadingTime[i], fTimeWidth[i], Bool_t((10+fEvenOrOdd)%2), chargeADC, fLabels[i]);
+ }
+ delete [] chargeADC;
+
+ treeD->Fill();
+ loader->WriteDigits("OVERWRITE");
+ loader->UnloadDigits();
+ ResetDigits();
+}
+
+void AliVZERODigitizer::WriteSDigits(AliLoader *loader)
+{
+ // Take fTime arrays filled by the previous
+ // method and produce and add sdigits to the sdigit Tree
+
+ loader->LoadSDigits("UPDATE");
+
+ if (!loader->TreeS()) loader->MakeTree("S");
+ loader->MakeSDigitsContainer();
+ TTree* treeS = loader->TreeS();
+ SDigitsArray();
+ treeS->Branch("VZEROSDigit", &fDigits);
+
+ for (Int_t ipmt = 0; ipmt < 64; ++ipmt) {
+ AddSDigit(ipmt,fNBins[ipmt],fTime[ipmt],fLabels[ipmt]);
+ }
+
+ treeS->Fill();
+ loader->WriteSDigits("OVERWRITE");
+ loader->UnloadSDigits();
+ ResetDigits();
+}
+
+void AliVZERODigitizer::ReadSDigits()
+{
+ // Read SDigits which are then to precessed
+ // in the following method
+ for(Int_t i = 0 ; i < 64; ++i) {
+ memset(fTime[i],0,fNBins[i]*sizeof(Float_t));
+ fLabels[i][0] = fLabels[i][1] = fLabels[i][2] = -1;
+ }
+
+ // Loop over input files
+ Int_t nFiles= fDigInput->GetNinputs();
+ for (Int_t inputFile = 0; inputFile < nFiles; inputFile++) {
+ // Get the current loader
+ AliRunLoader* currentLoader =
+ AliRunLoader::GetRunLoader(fDigInput->GetInputFolderName(inputFile));
+
+ AliLoader *loader = currentLoader->GetLoader("VZEROLoader");
+ loader->LoadSDigits("READ");
+
+ // Get the tree of summable digits
+ TTree* sdigitsTree = loader->TreeS();
+ if (!sdigitsTree) {
+ AliError("No sdigit tree from digInput");
+ continue;
+ }
+
+ // Get the branch
+ TBranch* sdigitsBranch = sdigitsTree->GetBranch("VZEROSDigit");
+ if (!sdigitsBranch) {
+ AliError("Failed to get sdigit branch");
+ return;
+ }
+
+ // Set the branch address
+ TClonesArray *sdigitsArray = NULL;
+ sdigitsBranch->SetAddress(&sdigitsArray);
+
+ // Sum contributions from the sdigits
+ // Get number of entries in the tree
+ Int_t nentries = Int_t(sdigitsBranch->GetEntries());
+ for (Int_t entry = 0; entry < nentries; ++entry) {
+ sdigitsBranch->GetEntry(entry);
+ // Get the number of sdigits
+ Int_t nsdigits = sdigitsArray->GetEntries();
+ for (Int_t sdigit = 0; sdigit < nsdigits; sdigit++) {
+ AliVZEROSDigit* sDigit = static_cast<AliVZEROSDigit*>(sdigitsArray->UncheckedAt(sdigit));
+ Int_t pmNumber = sDigit->PMNumber();
+ Int_t nbins = sDigit->GetNBins();
+ if (nbins != fNBins[pmNumber]) {
+ AliError(Form("Incompatible number of bins between digitizer (%d) and sdigit (%d) for PM %d! Skipping sdigit!",
+ fNBins[pmNumber],nbins,pmNumber));
+ continue;
+ }
+ // Sum the charges
+ Float_t *charges = sDigit->GetCharges();
+ for(Int_t iBin = 0; iBin < nbins; ++iBin) fTime[pmNumber][iBin] += charges[iBin];
+ // and the labels
+ Int_t *labels = sDigit->GetTracks();
+ Int_t j = 0;
+ for(Int_t i = 0; i < 3; ++i) {
+ if (fLabels[pmNumber][i] < 0) {
+ if (labels[j] < 0) break;
+ fLabels[pmNumber][i] = labels[j];
+ j++;
+ }
+ }
+ }
+ }
+ loader->UnloadSDigits();
+ }
+}
+
+//____________________________________________________________________
+TClonesArray*
+AliVZERODigitizer::DigitsArray()
+{
+ // Initialize digit array if not already and
+ // return pointer to it.
+ if (!fDigits) {
+ fDigits = new TClonesArray("AliVZEROdigit", 64);
+ fNdigits = 0;
+ }
+ return fDigits;
+}
+
+//____________________________________________________________________
+TClonesArray*
+AliVZERODigitizer::SDigitsArray()
+{
+ // Initialize sdigit array if not already and
+ // return pointer to it.
+ if (!fDigits) {
+ fDigits = new TClonesArray("AliVZEROSDigit", 64);
+ fNdigits = 0;
+ }
+ return fDigits;
+}