2 /**************************************************************************
3 * Copyright(c) 1998-2000, ALICE Experiment at CERN, All rights reserved. *
5 * Author: The ALICE Off-line Project. *
6 * Contributors are mentioned in the code where appropriate. *
8 * Permission to use, copy, modify and distribute this software and its *
9 * documentation strictly for non-commercial purposes is hereby granted *
10 * without fee, provided that the above copyright notice appears in all *
11 * copies and that both the copyright notice and this permission notice *
12 * appear in the supporting documentation. The authors make no claims *
13 * about the suitability of this software for any purpose. It is *
14 * provided "as is" without express or implied warranty. *
15 **************************************************************************/
20 #include <TDirectory.h>
27 #include "AliSTARTDigitizer.h"
29 #include "AliSTARThit.h"
30 #include "AliSTARTdigit.h"
31 #include "AliRunDigitizer.h"
32 #include <AliDetector.h>
34 #include <AliLoader.h>
35 #include <AliRunLoader.h>
37 #include <Riostream.h>
38 #include <Riostream.h>
40 ClassImp(AliSTARTDigitizer)
42 //___________________________________________
43 AliSTARTDigitizer::AliSTARTDigitizer() :AliDigitizer()
45 // Default ctor - don't use it
49 //___________________________________________
50 AliSTARTDigitizer::AliSTARTDigitizer(AliRunDigitizer* manager)
51 :AliDigitizer(manager),
59 // cout<<"AliSTARTDigitizer::AliSTARTDigitizer"<<endl;
60 // ctor which should be used
62 AliDebug(1,"processed");
69 ftimeTDC = new TArrayI(36);
70 fADC = new TArrayI(36);
72 TFile* file = TFile::Open("$ALICE_ROOT/START/PMTefficiency.root");
73 fEff = (TH1F*) file->Get("hEff")->Clone();
74 fEff->SetDirectory(NULL);
79 //------------------------------------------------------------------------
80 AliSTARTDigitizer::~AliSTARTDigitizer()
91 //------------------------------------------------------------------------
92 Bool_t AliSTARTDigitizer::Init()
100 //---------------------------------------------------------------------
102 void AliSTARTDigitizer::Exec(Option_t* /*option*/)
106 Produde digits from hits
107 digits is TObject and includes
108 We are writing array if left & right TDC
109 left & right ADC (will need for slow simulation)
110 TOF first particle left & right
111 mean time and time difference (vertex position)
115 AliRunLoader *inRL, *outRL;//in and out Run Loaders
116 AliLoader *pInStartLoader, *pOutStartLoader;// in and out STARTLoaders
118 outRL = AliRunLoader::GetRunLoader(fManager->GetOutputFolderName());
119 pOutStartLoader = outRL->GetLoader("STARTLoader");
121 AliDebug(1,"start...");
124 // From hits to digits
129 Int_t volume,pmt,tr,sumRight;
130 Int_t bestRightTDC,bestLeftTDC;
131 Float_t time[36]={36*0};
132 Float_t besttime[36]={36*0};
133 Float_t timeGaus[36]={36*0};
134 Float_t channelWidth=25.; //ps
136 AliSTARThit *startHit;
139 pOutStartLoader->LoadDigits("UPDATE");//probably it is necessary to load them before
140 fdigits= new AliSTARTdigit();
141 pOutStartLoader->GetDigitsDataLoader()->GetBaseLoader(0)->Post(fdigits);
143 Int_t nFiles=fManager->GetNinputs();
144 for (Int_t inputFile=0; inputFile<nFiles; inputFile++) {
145 if (inputFile < nFiles-1) {
146 AliWarning(Form("ignoring input stream %d", inputFile));
151 Float_t besttimeright=9999.;
152 Float_t besttimeleft=9999.;
155 for (Int_t i0=0; i0<36; i0++)
157 time[i0]=9999; besttime[i0]=9999; countE[i0]=0;
160 inRL = AliRunLoader::GetRunLoader(fManager->GetInputFolderName(inputFile));
161 if (!inRL->GetAliRun()) inRL->LoadgAlice();
162 AliSTART *fSTART = (AliSTART*) inRL->GetAliRun()->GetDetector("START");
163 pInStartLoader = inRL->GetLoader("STARTLoader");
164 pInStartLoader->LoadHits("READ");//probably it is necessary to load them before
165 TClonesArray *fHits = fSTART->Hits ();
167 TTree *th = pInStartLoader->TreeH();
168 brHits = th->GetBranch("START");
170 fSTART->SetHitsAddressBranch(brHits);
172 AliError("Branch START hit not found");
175 Int_t ntracks = (Int_t) th->GetEntries();
177 if (ntracks<=0) return;
178 // Start loop on tracks in the hits containers
179 for (Int_t track=0; track<ntracks;track++) {
180 brHits->GetEntry(track);
181 nhits = fHits->GetEntriesFast();
182 for (hit=0;hit<nhits;hit++)
184 startHit = (AliSTARThit*) fHits->UncheckedAt(hit);
186 AliError("The unchecked hit doesn't exist");
191 Double_t e=startHit->Etot();
192 // cout<<"AliSTARTDigitizer::Exec >> e "<<e<<" time "<< startHit->Time()<<endl;
193 volume = startHit->Volume();
195 if(e>0 && RegisterPhotoE(e)) {
197 besttime[numpmt] = startHit->Time();
198 if(besttime[numpmt]<time[numpmt])
200 time[numpmt]=besttime[numpmt];
206 //best time right&left
207 for (Int_t ipmt=0; ipmt<12; ipmt++)
209 timeGaus[ipmt]=gRandom->Gaus(time[ipmt],0.025);
210 if(timeGaus[ipmt]<besttimeleft) besttimeleft=timeGaus[ipmt]; //timeleft
212 // for ( Int_t ipmt=12; ipmt<36; ipmt++)
213 for ( Int_t ipmt=12; ipmt<36; ipmt++)
215 timeGaus[ipmt]=gRandom->Gaus(time[ipmt],0.025);
216 if(timeGaus[ipmt]<besttimeright) besttimeright=timeGaus[ipmt]; //timeright
219 //folding with experimental time distribution
220 Float_t c = 29.9792; // mm/ns
221 Float_t koef=(350.-69.7)/c;
222 Float_t besttimeleftR= besttimeleft;
223 besttimeleft=koef+besttimeleft;
224 bestLeftTDC=Int_t (besttimeleftR*1000/channelWidth);
225 bestRightTDC=Int_t (besttimeright*1000/channelWidth);
226 timeDiff=(c*(besttimeright-besttimeleftR)-(350.-69.7))/(2*c);
227 meanTime=(besttimeright+besttimeleftR)/2.;
228 Float_t ds=(c*(besttimeright-besttimeleftR)-(350.-69.7))/2;
229 AliDebug(2,Form(" timediff in ns %f z= %f real point%f",timeDiff,timeDiff*c,ds));
232 // Time to TDC signal
233 Int_t iTimeAv=Int_t (meanTime*1000/channelWidth);
234 // time channel numbres
236 fdigits->SetTimeBestLeft(bestLeftTDC);
237 fdigits->SetTimeBestRight(bestRightTDC);
238 fdigits->SetMeanTime(iTimeAv);
242 for (Int_t i=0; i<36; i++)
246 tr= Int_t (timeGaus[i]*1000/channelWidth);
247 if(timeGaus[i]>100) tr=0;
248 ftimeTDC->AddAt(tr,i);
251 Int_t al= countE[i]; //1024 - channel width shoul be change
255 fdigits->SetTime(*ftimeTDC);
256 fdigits->SetADC(*fADC);
258 pInStartLoader->UnloadHits();
260 } //input streams loop
262 pOutStartLoader->WriteDigits("OVERWRITE");
263 pOutStartLoader->UnloadDigits();
267 //------------------------------------------------------------------------
268 Bool_t AliSTARTDigitizer::RegisterPhotoE(Double_t energy)
272 // Float_t hc=197.326960*1.e6; //mev*nm
273 Double_t hc=1.973*1.e-6; //gev*nm
274 // cout<<"AliSTARTDigitizer::RegisterPhotoE >> energy "<<energy<<endl;
275 Float_t lambda=hc/energy;
276 Int_t bin= fEff->GetXaxis()->FindBin(lambda);
277 Float_t eff=fEff->GetBinContent(bin);
278 Double_t p = gRandom->Rndm();
284 //----------------------------------------------------------------------------