1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
18 ///_________________________________________________________________________
20 /// This class constructs Digits out of Hits
24 // --- Standard library ---
26 // --- ROOT system ---
30 #include <TGeoManager.h>
31 #include <TGeoPhysicalNode.h>
32 #include <AliGeomManager.h>
37 // --- AliRoot header files ---
40 #include "AliVZEROhit.h"
41 #include "AliRunLoader.h"
42 #include "AliLoader.h"
43 #include "AliGRPObject.h"
44 #include "AliRunDigitizer.h"
45 #include "AliCDBManager.h"
46 #include "AliCDBStorage.h"
47 #include "AliCDBEntry.h"
48 #include "AliVZEROCalibData.h"
49 #include "AliCTPTimeParams.h"
50 #include "AliVZEROdigit.h"
51 #include "AliVZERODigitizer.h"
53 ClassImp(AliVZERODigitizer)
55 AliVZERODigitizer::AliVZERODigitizer()
57 fCalibData(GetCalibData()),
58 fPhotoCathodeEfficiency(0.18),
63 fSinglePhESpectrum(NULL)
66 // default constructor
71 // fPhotoCathodeEfficiency = 0.18;
72 // fPMVoltage = 768.0;
73 // fPMGain = TMath::Power((fPMVoltage / 112.5) ,7.04277);
75 // fCalibData = GetCalibData();
77 fSignalShape = new TF1("VZEROSignalShape",this,&AliVZERODigitizer::SignalShape,0,200,6,"AliVZERODigitizer","SignalShape");
78 // fSignalShape->SetParameters(0,1.57345e1,-4.25603e-1,2.9,6.40982,3.69339e-01);
79 // fSignalShape->SetParameters(1.34330e+00,1.13007e+02,-4.95705e-01,
80 // 3.68911e+00,1.01040e+00, 3.94675e-01);
81 fSignalShape->SetParameters(-1.07335e+00,2.16002e+01,-1.26133e-01,
82 1.41619e+00,5.50334e-01,3.86111e-01);
84 fPMResponse = new TF1("VZEROPMResponse",this,&AliVZERODigitizer::PMResponse,-kPMRespTime,2.*kPMRespTime,0,"AliVZERODigitizer","PMResponse");
85 fSinglePhESpectrum = new TF1("VZEROSinglePhESpectrum",this,&AliVZERODigitizer::SinglePhESpectrum,0,20,0,"AliVZERODigitizer","SinglePhESpectrum");
87 // Now get the CTP L0->L1 delay
88 AliCDBEntry *entry = AliCDBManager::Instance()->Get("GRP/CTP/CTPtiming");
89 if (!entry) AliFatal("CTP timing parameters are not found in OCDB !");
90 AliCTPTimeParams *ctpParams = (AliCTPTimeParams*)entry->GetObject();
91 Float_t l1Delay = (Float_t)ctpParams->GetDelayL1L0()*25.0;
93 AliCDBEntry *entry2 = AliCDBManager::Instance()->Get("VZERO/Calib/TimeDelays");
94 if (!entry2) AliFatal("VZERO time delays are not found in OCDB !");
95 TH1F *delays = (TH1F*)entry2->GetObject();
97 for(Int_t i = 0 ; i < 64; ++i) {
99 for(Int_t j = 0; j < kNClocks; ++j) fAdc[i][j] = 0;
100 fLeadingTime[i] = fTimeWidth[i] = 0;
102 fPmGain[i] = fCalibData->GetGain(i);
104 fAdcPedestal[i][0] = fCalibData->GetPedestal(i);
105 fAdcSigma[i][0] = fCalibData->GetSigma(i);
106 fAdcPedestal[i][1] = fCalibData->GetPedestal(i+64);
107 fAdcSigma[i][1] = fCalibData->GetSigma(i+64);
110 fNBins[i] = TMath::Nint(((Float_t)(fCalibData->GetMatchWindow(board)+1)*25.0+
111 (Float_t)kMaxTDCWidth*fCalibData->GetWidthResolution(board))/
112 fCalibData->GetTimeResolution(board));
113 fNBinsLT[i] = TMath::Nint(((Float_t)(fCalibData->GetMatchWindow(board)+1)*25.0)/
114 fCalibData->GetTimeResolution(board));
115 fBinSize[i] = fCalibData->GetTimeResolution(board);
116 fHptdcOffset[i] = (((Float_t)fCalibData->GetTriggerCountOffset(board)-
117 (Float_t)fCalibData->GetRollOver(board))*25.0+
118 fCalibData->GetTimeOffset(i)+
120 delays->GetBinContent(i+1)+
123 fTime[i] = new Float_t[fNBins[i]];
124 memset(fTime[i],0,fNBins[i]*sizeof(Float_t));
129 //____________________________________________________________________________
130 AliVZERODigitizer::AliVZERODigitizer(AliRunDigitizer* manager)
131 :AliDigitizer(manager),
132 fCalibData(GetCalibData()),
133 fPhotoCathodeEfficiency(0.18),
138 fSinglePhESpectrum(NULL)
142 // Initialize OCDB and containers used in the digitization
144 fSignalShape = new TF1("VZEROSignalShape",this,&AliVZERODigitizer::SignalShape,0,200,6,"AliVZERODigitizer","SignalShape");
145 // fSignalShape->SetParameters(0,1.57345e1,-4.25603e-1,2.9,6.40982,3.69339e-01);
146 // fSignalShape->SetParameters(1.34330e+00,1.13007e+02,-4.95705e-01,
147 // 3.68911e+00,1.01040e+00, 3.94675e-01);
148 fSignalShape->SetParameters(-1.07335e+00,2.16002e+01,-1.26133e-01,
149 1.41619e+00,5.50334e-01,3.86111e-01);
150 fPMResponse = new TF1("VZEROPMResponse",this,&AliVZERODigitizer::PMResponse,-kPMRespTime,2.*kPMRespTime,0,"AliVZERODigitizer","PMResponse");
151 fSinglePhESpectrum = new TF1("VZEROSinglePhESpectrum",this,&AliVZERODigitizer::SinglePhESpectrum,0,20,0,"AliVZERODigitizer","SinglePhESpectrum");
153 // Now get the CTP L0->L1 delay
154 AliCDBEntry *entry = AliCDBManager::Instance()->Get("GRP/CTP/CTPtiming");
155 if (!entry) AliFatal("CTP timing parameters are not found in OCDB !");
156 AliCTPTimeParams *ctpParams = (AliCTPTimeParams*)entry->GetObject();
157 Float_t l1Delay = (Float_t)ctpParams->GetDelayL1L0()*25.0;
159 AliCDBEntry *entry2 = AliCDBManager::Instance()->Get("VZERO/Calib/TimeDelays");
160 if (!entry2) AliFatal("VZERO time delays are not found in OCDB !");
161 TH1F *delays = (TH1F*)entry2->GetObject();
163 for(Int_t i = 0 ; i < 64; ++i) {
165 for(Int_t j = 0; j < kNClocks; ++j) fAdc[i][j] = 0;
166 fLeadingTime[i] = fTimeWidth[i] = 0;
168 fPmGain[i] = fCalibData->GetGain(i);
170 fAdcPedestal[i][0] = fCalibData->GetPedestal(i);
171 fAdcSigma[i][0] = fCalibData->GetSigma(i);
172 fAdcPedestal[i][1] = fCalibData->GetPedestal(i+64);
173 fAdcSigma[i][1] = fCalibData->GetSigma(i+64);
176 fNBins[i] = TMath::Nint(((Float_t)(fCalibData->GetMatchWindow(board)+1)*25.0+
177 (Float_t)kMaxTDCWidth*fCalibData->GetWidthResolution(board))/
178 fCalibData->GetTimeResolution(board));
179 fNBinsLT[i] = TMath::Nint(((Float_t)(fCalibData->GetMatchWindow(board)+1)*25.0)/
180 fCalibData->GetTimeResolution(board));
181 fBinSize[i] = fCalibData->GetTimeResolution(board);
182 fHptdcOffset[i] = (((Float_t)fCalibData->GetTriggerCountOffset(board)-
183 (Float_t)fCalibData->GetRollOver(board))*25.0+
184 fCalibData->GetTimeOffset(i)+
186 delays->GetBinContent(i+1)+
189 fTime[i] = new Float_t[fNBins[i]];
190 memset(fTime[i],0,fNBins[i]*sizeof(Float_t));
194 //____________________________________________________________________________
195 AliVZERODigitizer::~AliVZERODigitizer()
213 if (fSinglePhESpectrum) {
214 delete fSinglePhESpectrum;
215 fSinglePhESpectrum = NULL;
218 for(Int_t i = 0 ; i < 64; ++i) {
219 if (fTime[i]) delete [] fTime[i];
223 //_____________________________________________________________________________
224 Bool_t AliVZERODigitizer::Init()
226 // Initialises the digitizer
228 // Initialises the Digit array
229 fDigits = new TClonesArray ("AliVZEROdigit", 1000);
234 //____________________________________________________________________________
235 void AliVZERODigitizer::Exec(Option_t* /*option*/)
237 // Creates digits from hits
240 for(Int_t i = 0 ; i < 64; ++i) {
241 memset(fTime[i],0,fNBins[i]*sizeof(Float_t));
242 for(Int_t j = 0; j < kNClocks; ++j) fAdc[i][j] = 0;
243 fLeadingTime[i] = fTimeWidth[i] = 0;
245 Float_t integral = fPMResponse->Integral(-kPMRespTime,2.*kPMRespTime);
246 Float_t meansPhE = fSinglePhESpectrum->Mean(0,20);
248 AliRunLoader* outRunLoader = AliRunLoader::GetRunLoader(fManager->GetOutputFolderName());
250 Error("Exec", "Can not get output Run Loader");
254 AliLoader* outLoader = outRunLoader->GetLoader("VZEROLoader");
257 Error("Exec", "Can not get output VZERO Loader");
261 const char* mode = "update";
262 if(outRunLoader->GetEventNumber() == 0) mode = "recreate";
263 outLoader->LoadDigits(mode);
265 if (!outLoader->TreeD()) outLoader->MakeTree("D");
266 outLoader->MakeDigitsContainer();
267 TTree* treeD = outLoader->TreeD();
268 Int_t bufsize = 16000;
269 treeD->Branch("VZERODigit", &fDigits, bufsize);
271 for (Int_t iInput = 0; iInput < fManager->GetNinputs(); iInput++) {
272 AliRunLoader* runLoader = AliRunLoader::GetRunLoader(fManager->GetInputFolderName(iInput));
273 AliLoader* loader = runLoader->GetLoader("VZEROLoader");
275 Error("Exec", "Can not get VZERO Loader for input %d", iInput);
279 if (!runLoader->GetAliRun()) runLoader->LoadgAlice();
281 AliVZERO* vzero = (AliVZERO*) runLoader->GetAliRun()->GetDetector("VZERO");
283 Error("Exec", "No VZERO detector for input %d", iInput);
288 TTree* treeH = loader->TreeH();
290 Error("Exec", "Cannot get TreeH for input %d", iInput);
294 TClonesArray* hits = vzero->Hits();
296 // Float_t lightYieldCorr[64] = {0.00707,0.00517,0.00520,0.00537,0.00735,0.00537,0.00733,0.00605,0.00778,0.00749,0.00701,0.00755,0.00732,0.00617,0.00669,0.00525,0.00752,0.00820,0.00797,0.01107,0.01080,0.00889,0.00880,0.01712,0.00866,0.00701,0.00811,0.00602,0.00879,0.00821,0.00861,0.01433,0.00061,0.00032,0.00099,0.00061,0.00034,0.00046,0.00031,0.00122,0.00155,0.00091,0.00032,0.00096,0.00120,0.00067,0.00113,0.00060,0.00158,0.00136,0.00340,0.00066,0.00076,0.00119,0.00129,0.00147,0.00137,0.00117,0.00088,0.00164,0.00128,0.00081,0.00121,0.00250};
297 Float_t lightYieldCorr[64] = {0.01173,0.00874,0.00878,0.00886,0.01151,0.00925,0.01167,0.00983,0.01181,0.01243,0.01115,0.01220,0.01228,0.01053,0.01021,0.00930,0.01270,0.01411,0.01316,0.01894,0.01923,0.01860,0.01738,0.00305,0.01584,0.01251,0.01344,0.00310,0.01302,0.01266,0.01407,0.00338,0.00089,0.00100,0.00130,0.00081,0.00052,0.01230,0.00059,0.02452,0.02980,0.00137,0.01421,0.00116,0.00141,0.00092,0.02480,0.00096,0.00182,0.00174,0.00218,0.00106,0.00116,0.00160,0.00162,0.03097,0.00194,0.00171,0.00132,0.00239,0.00173,0.00118,0.00163,0.00262};
298 // Now makes Digits from hits
299 Int_t nTracks = (Int_t) treeH->GetEntries();
300 for (Int_t iTrack = 0; iTrack < nTracks; iTrack++) {
302 treeH->GetEvent(iTrack);
303 Int_t nHits = hits->GetEntriesFast();
304 for (Int_t iHit = 0; iHit < nHits; iHit++) {
305 AliVZEROhit* hit = (AliVZEROhit *)hits->UncheckedAt(iHit);
306 Int_t nPhot = hit->Nphot();
307 Int_t cell = hit->Cell();
308 Int_t pmt = Cell2Pmt(cell);
309 Float_t dt_scintillator = gRandom->Gaus(0,kIntTimeRes);
310 Float_t t = dt_scintillator + 1e9*hit->Tof();
311 if (pmt < 32) t += kV0CDelayCables;
312 t += fHptdcOffset[pmt];
314 Float_t prob = lightYieldCorr[pmt]*fPhotoCathodeEfficiency; // Optical losses included!
316 nPhE =gRandom->Gaus(prob*Float_t(nPhot)+0.5,
317 sqrt(Float_t(nPhot)*prob*(1.-prob)));
319 nPhE = gRandom->Binomial(nPhot,prob);
320 Float_t charge = TMath::Qe()*fPmGain[pmt]*fBinSize[pmt]/integral;
321 for (Int_t iPhE = 0; iPhE < nPhE; ++iPhE) {
322 Float_t tPhE = t + fSignalShape->GetRandom(0,fBinSize[pmt]*Float_t(fNBins[pmt]));
323 Float_t gainVar = fSinglePhESpectrum->GetRandom(0,20)/meansPhE;
324 Int_t firstBin = TMath::Max(0,(Int_t)((tPhE-kPMRespTime)/fBinSize[pmt]));
325 Int_t lastBin = TMath::Min(fNBins[pmt]-1,(Int_t)((tPhE+2.*kPMRespTime)/fBinSize[pmt]));
326 for(Int_t iBin = firstBin; iBin <= lastBin; ++iBin) {
327 Float_t tempT = fBinSize[pmt]*(0.5+iBin)-tPhE;
328 fTime[pmt][iBin] += gainVar*charge*fPMResponse->Eval(tempT);
333 loader->UnloadHits();
336 Float_t maximum = 0.9*fSignalShape->GetMaximum(0,200); // Not exact, one needs to do this on the convoluted
337 Float_t integral2 = fSignalShape->Integral(0,200); // function. Anyway the effect is small <10% on the 2.5 ADC thr
338 for (Int_t ipmt = 0; ipmt < 64; ++ipmt) {
339 Float_t thr = fCalibData->GetDiscriThr(ipmt)*kChargePerADC*maximum*fBinSize[ipmt]/integral2;
340 Bool_t ltFound = kFALSE, ttFound = kFALSE;
341 for (Int_t iBin = 0; iBin < fNBins[ipmt]; ++iBin) {
342 Float_t t = fBinSize[ipmt]*Float_t(iBin+0.5);
343 if (fTime[ipmt][iBin] > thr) {
344 if (!ltFound && (iBin < fNBinsLT[ipmt])) {
346 fLeadingTime[ipmt] = t;
353 fTimeWidth[ipmt] = t - fLeadingTime[ipmt];
357 Float_t tadc = t - kADCTimeOffset;
358 Int_t clock = kNClocks - Int_t(tadc/25.0) - 1;
359 if (clock >= 0 && clock < kNClocks)
360 fAdc[ipmt][clock] += fTime[ipmt][iBin]/kChargePerADC;
362 Int_t board = ipmt / 8;
363 if (ltFound && ttFound) {
364 fTimeWidth[ipmt] = fCalibData->GetWidthResolution(board)*
365 Float_t(Int_t(fTimeWidth[ipmt]/fCalibData->GetWidthResolution(board)));
366 if (fTimeWidth[ipmt] < Float_t(kMinTDCWidth)*fCalibData->GetWidthResolution(board))
367 fTimeWidth[ipmt] = Float_t(kMinTDCWidth)*fCalibData->GetWidthResolution(board);
368 if (fTimeWidth[ipmt] > Float_t(kMaxTDCWidth)*fCalibData->GetWidthResolution(board))
369 fTimeWidth[ipmt] = Float_t(kMaxTDCWidth)*fCalibData->GetWidthResolution(board);
373 Int_t evenOrOdd = gRandom->Integer(2);
374 for (Int_t j=0; j<64; ++j){
375 for (Int_t iClock = 0; iClock < kNClocks; ++iClock) {
376 Int_t integrator = (iClock + evenOrOdd) % 2;
377 fAdc[j][iClock] += gRandom->Gaus(fAdcPedestal[j][integrator], fAdcSigma[j][integrator]);
381 // Now add digits to the digit Tree
383 for (Int_t i=0; i<64; i++) {
384 // printf(" cell %d adc ",i);
385 // for (Int_t j = 0; j < kNClocks; ++j)
386 // printf("%d ", Int_t(fAdc[i][j]));
389 for (Int_t j = 8; j <= 11; ++j) {
390 Int_t tempadc = Int_t(fAdc[i][j]);
391 if (tempadc > 1023) tempadc = 1023;
392 Int_t integrator = (j + evenOrOdd) % 2;
393 if ((Float_t(tempadc) - fAdcPedestal[i][integrator]) > (2.*fAdcSigma[i][integrator]))
394 totADC += (Float_t(tempadc) - fAdcPedestal[i][integrator]);
396 totADC += fAdcPedestal[i][(10+evenOrOdd)%2];
397 AddDigit(i, totADC, fLeadingTime[i], fTimeWidth[i], Bool_t((10+evenOrOdd)%2));
401 outLoader->WriteDigits("OVERWRITE");
402 outLoader->UnloadDigits();
406 //____________________________________________________________________________
407 void AliVZERODigitizer::AddDigit(Int_t PMnumber, Float_t adc, Float_t time, Float_t width, Bool_t integrator)
412 TClonesArray &ldigits = *fDigits;
414 new(ldigits[fNdigits++]) AliVZEROdigit(PMnumber,adc,time,width,kFALSE,kFALSE,integrator);
417 //____________________________________________________________________________
418 void AliVZERODigitizer::ResetDigit()
424 if (fDigits) fDigits->Delete();
427 //____________________________________________________________________________
428 AliVZEROCalibData* AliVZERODigitizer::GetCalibData() const
431 AliCDBManager *man = AliCDBManager::Instance();
433 AliCDBEntry *entry=0;
435 entry = man->Get("VZERO/Calib/Data");
438 // AliWarning("Load of calibration data from default storage failed!");
439 // AliWarning("Calibration data will be loaded from local storage ($ALICE_ROOT)");
440 // Int_t runNumber = man->GetRun();
441 // entry = man->GetStorage("local://$ALICE_ROOT/OCDB")
442 // ->Get("VZERO/Calib/Data",runNumber);
446 // Retrieval of data in directory VZERO/Calib/Data:
449 AliVZEROCalibData *calibdata = 0;
451 if (entry) calibdata = (AliVZEROCalibData*) entry->GetObject();
452 if (!calibdata) AliFatal("No calibration data from calibration database !");
458 double AliVZERODigitizer::SignalShape(double *x, double *par)
460 // this function simulates the time
461 // of arrival of the photons at the
464 if (xx <= par[0]) return 0;
465 Double_t a = 1./TMath::Power((xx-par[0])/par[1],1./par[2]);
466 if (xx <= par[3]) return a;
467 Double_t b = 1./TMath::Power((xx-par[3])/par[4],1./par[5]);
468 Double_t f = a*b/(a+b);
469 AliDebug(100,Form("x=%f func=%f",xx,f));
473 double AliVZERODigitizer::PMResponse(double *x, double * /* par */)
475 // this function describes the
476 // PM time response to a single
478 Double_t xx = x[0]+kPMRespTime;
479 return xx*xx*TMath::Exp(-xx*xx/(kPMRespTime*kPMRespTime));
482 double AliVZERODigitizer::SinglePhESpectrum(double *x, double * /* par */)
484 // this function describes the
485 // PM amplitude response to a single
488 if (xx < 0) return 0;
489 return (TMath::Poisson(xx,kPMNbOfSecElec)+kPMTransparency*TMath::Poisson(xx,1.0));
492 Int_t AliVZERODigitizer::Cell2Pmt(Int_t cell) const
494 // The method maps the scintillator
495 // indexes to the PM ones
496 if (cell < 0 || cell >= 80) {
497 AliError(Form("Wrong VZERO cell index %d",cell));
500 if (cell < 16) return cell;
501 if (cell < 48) return 8 + cell/2;