Digits from AliRunDigitizer
[u/mrichter/AliRoot.git] / START / AliSTARTDigitizer.cxx
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2/**************************************************************************
3 * Copyright(c) 1998-2000, ALICE Experiment at CERN, All rights reserved. *
4 * *
5 * Author: The ALICE Off-line Project. *
6 * Contributors are mentioned in the code where appropriate. *
7 * *
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 **************************************************************************/
16
17
18#include <TTree.h>
19#include <TVector.h>
20#include <TObjArray.h>
21#include <TFile.h>
22#include <TDirectory.h>
23#include <TRandom.h>
24
25
26#include "AliSTARTDigitizer.h"
27#include "AliSTART.h"
28#include "AliSTARThit.h"
29#include "AliSTARTdigit.h"
30#include "AliRunDigitizer.h"
31
32#include "AliRun.h"
33#include "AliPDG.h"
34
35#include <stdlib.h>
36#include <iostream.h>
37#include <fstream.h>
38
39ClassImp(AliSTARTDigitizer)
40
41//___________________________________________
42 AliSTARTDigitizer::AliSTARTDigitizer() :AliDigitizer()
43{
44// Default ctor - don't use it
45 ;
46}
47
48//___________________________________________
49AliSTARTDigitizer::AliSTARTDigitizer(AliRunDigitizer* manager)
50 :AliDigitizer(manager)
51{
52 cout<<"AliSTARTDigitizer::AliSTARTDigitizer"<<endl;
53// ctor which should be used
54// fDebug =0;
55 // if (GetDebug()>2)
56 // cerr<<"AliSTARTDigitizer::AliSTARTDigitizer"
57 // <<"(AliRunDigitizer* manager) was processed"<<endl;
58
59}
60
61//------------------------------------------------------------------------
62AliSTARTDigitizer::~AliSTARTDigitizer()
63{
64// Destructor
65
66
67}
68
69 //------------------------------------------------------------------------
70Bool_t AliSTARTDigitizer::Init()
71{
72// Initialization
73 cout<<"AliSTARTDigitizer::Init"<<endl;
74 return kTRUE;
75}
76
77
78//---------------------------------------------------------------------
79
80void AliSTARTDigitizer::Exec(Option_t* option)
81{
82
83
84
85#ifdef DEBUG
86 cout<<"AliSTARTDigitizer::>SDigits2Digits start...\n";
87#endif
88 //
89 // From hits to digits
90 //
91 Int_t hit;
92 Int_t nhits;
93 Int_t volume,pmt;
94 char nameDigits[20];
95 Float_t timediff,timeright,timeleft,timeav;
96 Float_t besttimeright,besttimeleft,meanTime;
97 Int_t channelWidth=10;
98 fHits = new TClonesArray ("AliSTARThit", 1000);
99 AliSTART *START = (AliSTART*) gAlice->GetDetector("START");
100
101 AliSTARThit *startHit;
102 TBranch *brHits=0;
103 fdigits= new AliSTARTdigit();
104
105 Int_t nFiles=fManager->GetNinputs();
106 for (Int_t inputFile=0; inputFile<nFiles; inputFile++) {
107 sprintf(nameDigits,"START_D_%d",fManager->GetOutputEventNr());
108
109 besttimeright=9999.;
110 besttimeleft=9999.;
111 Int_t timeDiff=0;
112 Int_t timeAv=0;
113 TClonesArray *STARThits = START->Hits ();
114
115 TTree *th = fManager->GetInputTreeH(inputFile);
116 brHits = th->GetBranch("START");
117 if (brHits) {
118 START->SetHitsAddressBranch(brHits);
119 }else{
120 cerr<<"EXEC Branch START hit not found"<<exit;
121 }
122 Int_t ntracks = (Int_t) th->GetEntries();
123 if (ntracks<=0) return;
124 // Start loop on tracks in the hits containers
125 for (Int_t track=0; track<ntracks;track++) {
126 brHits->GetEntry(track);
127 nhits = STARThits->GetEntriesFast();
128 for (hit=0;hit<nhits;hit++) {
129 startHit = (AliSTARThit*) STARThits->UncheckedAt(hit);
130 pmt=startHit->fPmt;
131 volume = startHit->fVolume;
132 if(volume==1){
133 timeright = startHit->fTime;
134 if(timeright<besttimeright) {
135 besttimeright=timeright;
136 } //timeright
137 }//time for right shoulder
138 if(volume==2){
139 timeleft = startHit->fTime;
140 // printf("timeleft %f\n",timeleft);
141 if(timeleft<besttimeleft) {
142 besttimeleft=timeleft;
143 } //timeleftbest
144 }//time for left shoulder
145 } //hit loop
146 } //track loop
147
148 //folding with experimental time distribution
149 Float_t besttimerightGaus=gRandom->Gaus(besttimeright,0.05);
150 Float_t besttimeleftGaus=gRandom->Gaus(besttimeleft,0.05);
151 timediff=besttimerightGaus-besttimeleftGaus;
152 meanTime=(besttimerightGaus+besttimeleftGaus)/2.;
153 if ( TMath::Abs(timediff)<TMath::Abs(10.) && meanTime<TMath::Abs(7.1))
154 {
155 //we assume centre of bunch is 5ns after TTS signal
156 //TOF values are relative of the end of bunch
157 Float_t ppBunch=25;
158
159 ppBunch=ppBunch-10/2;
160 Float_t t1=1000.*besttimeleftGaus;
161 Float_t t2=1000.*besttimerightGaus;
162 t1=t1/channelWidth+ppBunch; //time in ps to channelWidth
163 t2=t2/channelWidth+ppBunch; //time in ps to channelWidth
164
165 timeav=(t1+t2)/2.;
166
167 // Time to TDC signal
168 // 256 channels for timediff, range 1ns
169
170 timediff=128+1000*timediff/channelWidth; // time in ps
171
172 timeAv = (Int_t)(timeav); // time (ps) channel numbres
173 timeDiff = (Int_t)(timediff); // time ( ps) channel numbres
174 fdigits->Set(timeAv,timeDiff);
175 fdigits->Print();
176 }
177 else
178 {timeAv=999999; timeDiff=99999;}
179
180// trick to find out output dir:
181 TTree *outTree = fManager->GetTreeD();
182 if (!outTree) {
183 cerr<<"something wrong with output...."<<exit;
184 return;
185 }
186 TDirectory *wd = gDirectory;
187 outTree->GetDirectory()->cd();
188 fdigits->Write(nameDigits);
189 wd->cd();
190 }
191
192}
193
194