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),
62 // ctor which should be used
64 AliDebug(1,"processed");
70 ftimeTDC = new TArrayI(24);
71 fADC = new TArrayI(24);
72 ftimeTDCAmp = new TArrayI(24);
73 fADCAmp = new TArrayI(24);
74 fSumMult = new TArrayI(6);
77 TFile* file = TFile::Open("$ALICE_ROOT/START/PMTefficiency.root");
78 fEff = (TH1F*) file->Get("hEff")->Clone();
79 fEff->SetDirectory(NULL);
84 //------------------------------------------------------------------------
85 AliSTARTDigitizer::~AliSTARTDigitizer()
99 //------------------------------------------------------------------------
100 Bool_t AliSTARTDigitizer::Init()
108 //---------------------------------------------------------------------
110 void AliSTARTDigitizer::Exec(Option_t* /*option*/)
114 Produde digits from hits
115 digits is TObject and includes
116 We are writing array if left & right TDC
117 left & right ADC (will need for slow simulation)
118 TOF first particle left & right
119 mean time and time difference (vertex position)
124 AliRunLoader *outRL = AliRunLoader::GetRunLoader(fManager->GetOutputFolderName());
125 AliLoader * pOutStartLoader = outRL->GetLoader("STARTLoader");
127 AliDebug(1,"start...");
130 // From hits to digits
133 Int_t countE[24], sumMult[3];
134 Int_t volume,pmt,tr,qt,qtAmp;
135 Int_t bestRightTDC,bestLeftTDC;
136 Float_t time[24],besttime[24], timeGaus[24] ;
137 Float_t channelWidth=25.; //ps
138 //Q->T-> coefficients !!!! should be asked!!!
139 Float_t ph2mV = 150./500.;
140 Int_t threshold =50; //photoelectrons
141 Int_t mV2channel=200000/(25*25); //5V -> 200ns
144 AliSTARThit *startHit;
147 Int_t nFiles=fManager->GetNinputs();
148 for (Int_t inputFile=0; inputFile<nFiles; inputFile++) {
149 if (inputFile < nFiles-1) {
150 AliWarning(Form("ignoring input stream %d", inputFile));
155 Float_t besttimeright=99999.;
156 Float_t besttimeleft=99999.;
157 Int_t timeDiff, meanTime;
159 for (Int_t i0=0; i0<24; i0++)
161 time[i0]=besttime[i0]=timeGaus[i0]=99999; countE[i0]=0;
163 for ( Int_t imu=0; imu<3; imu++) sumMult[imu]=0;
164 AliRunLoader * inRL = AliRunLoader::GetRunLoader(fManager->GetInputFolderName(inputFile));
165 AliLoader * pInStartLoader = inRL->GetLoader("STARTLoader");
166 if (!inRL->GetAliRun()) inRL->LoadgAlice();
167 AliSTART *fSTART = (AliSTART*)inRL ->GetAliRun()->GetDetector("START");
170 pInStartLoader->LoadHits("READ");//probably it is necessary to load them before
171 TClonesArray *fHits = fSTART->Hits ();
172 TTree *th = pInStartLoader->TreeH();
173 brHits = th->GetBranch("START");
175 fSTART->SetHitsAddressBranch(brHits);
177 AliError("Branch START hit not found");
180 Int_t ntracks = (Int_t) th->GetEntries();
182 if (ntracks<=0) return;
183 // Start loop on tracks in the hits containers
184 for (Int_t track=0; track<ntracks;track++) {
185 brHits->GetEntry(track);
186 nhits = fHits->GetEntriesFast();
187 for (hit=0;hit<nhits;hit++)
189 startHit = (AliSTARThit*) fHits->UncheckedAt(hit);
191 AliError("The unchecked hit doesn't exist");
196 Double_t e=startHit->Etot();
197 volume = startHit->Volume();
199 if(e>0 && RegisterPhotoE(e)) {
201 besttime[numpmt] = startHit->Time();
202 if(besttime[numpmt]<time[numpmt])
204 time[numpmt]=besttime[numpmt];
210 //spread time right&left by 25ps && besttime
211 for (Int_t ipmt=0; ipmt<12; ipmt++){
212 if(countE[ipmt] > threshold) {
213 timeGaus[ipmt]=gRandom->Gaus(time[ipmt],25);
214 if(timeGaus[ipmt]<besttimeleft) besttimeleft=timeGaus[ipmt]; //timeleft
215 sumMult[0] += countE[ipmt];
216 sumMult[1] += countE[ipmt];
219 for ( Int_t ipmt=12; ipmt<24; ipmt++){
220 if(countE[ipmt] > threshold) {
221 timeGaus[ipmt]=gRandom->Gaus(time[ipmt],25);
222 if(timeGaus[ipmt]<besttimeright) besttimeright=timeGaus[ipmt]; //timeright
223 sumMult[0] += countE[ipmt];
224 sumMult[2] += countE[ipmt];
227 //ADC features fill digits
228 //folding with experimental time distribution
229 Float_t c = 0.0299792; // cm/ps
230 Float_t koef=(350.-69.7)/c;
231 Float_t besttimeleftR= besttimeleft;
232 besttimeleft=koef+besttimeleft;
233 bestLeftTDC=Int_t (besttimeleftR/channelWidth);
234 bestRightTDC=Int_t (besttimeright/channelWidth);
235 timeDiff=Int_t ((besttimeright-besttimeleftR)/channelWidth);
236 meanTime=Int_t (((besttimeright+besttimeleft)/2.)/channelWidth);
237 AliDebug(2,Form(" time in ns %f ", besttimeleft));
238 for (Int_t i=0; i<24; i++)
241 tr= Int_t (timeGaus[i]/channelWidth);
242 if(timeGaus[i]>50000) tr=0;
247 // phe -> mV 0.3; 1MIP ->500phe -> ln (amp (mV)) = 5;
248 // max 200ns, HIJING mean 50000phe -> 15000mv -> ln = 15 (s zapasom)
251 qt=Int_t (TMath::Log(al*ph2mV) * mV2channel);
252 qtAmp=Int_t (TMath::Log(al*10*ph2mV) * mV2channel);
254 ftimeTDC->AddAt(tr,i);
255 fADCAmp->AddAt(qtAmp,i);
256 ftimeTDCAmp->AddAt(tr,i); //now is the same as non-amplified but will be change
259 for (Int_t im=0; im<3; im++)
261 if (sumMult[im]>threshold){
262 Int_t sum=Int_t (TMath::Log(sumMult[im]*ph2mV) * mV2channel);
263 Int_t sumAmp=Int_t (TMath::Log(10*sumMult[im]*ph2mV) * mV2channel);
264 fSumMult->AddAt(sum,im);
265 fSumMult->AddAt(sumAmp,im+3);
269 fSTART->AddDigit(bestRightTDC,bestLeftTDC,meanTime,timeDiff,fSumMult,
270 ftimeTDC,fADC,ftimeTDCAmp,fADCAmp);
271 pOutStartLoader->UnloadHits();
272 } //input streams loop
275 pOutStartLoader->LoadDigits("UPDATE");
276 TTree *treeD = pOutStartLoader->TreeD();
278 pOutStartLoader->MakeTree("D");
279 treeD = pOutStartLoader->TreeD();
281 AliSTART *fSTART = (AliSTART*)outRL ->GetAliRun()->GetDetector("START");
282 fSTART->MakeBranch("D");
286 pOutStartLoader->WriteDigits("OVERWRITE");
288 fSTART->ResetDigits();
289 pOutStartLoader->UnloadDigits();
294 //------------------------------------------------------------------------
295 Bool_t AliSTARTDigitizer::RegisterPhotoE(Double_t energy)
299 // Float_t hc=197.326960*1.e6; //mev*nm
300 Double_t hc=1.973*1.e-6; //gev*nm
301 Float_t lambda=hc/energy;
302 Int_t bin= fEff->GetXaxis()->FindBin(lambda);
303 Float_t eff=fEff->GetBinContent(bin);
304 Double_t p = gRandom->Rndm();
310 //----------------------------------------------------------------------------