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1 | /************************************************************************** |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * |
3 | * * |
4 | * Author: The ALICE Off-line Project. * |
5 | * Contributors are mentioned in the code where appropriate. * |
6 | * * |
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 | **************************************************************************/ |
15 | |
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16 | |
17 | #include "AliRICHClusterFinder.h" |
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18 | #include "AliRICHMap.h" |
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19 | #include <TMinuit.h> |
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20 | #include <TParticle.h> |
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21 | #include <TVector3.h> |
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22 | #include <AliLoader.h> |
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23 | #include <AliStack.h> |
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24 | #include <AliRun.h> |
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25 | |
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26 | void RICHMinMathieson(Int_t &npar, Double_t *gin, Double_t &chi2, Double_t *par, Int_t iflag); |
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27 | |
28 | ClassImp(AliRICHClusterFinder) |
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29 | //__________________________________________________________________________________________________ |
30 | AliRICHClusterFinder::AliRICHClusterFinder(AliRICH *pRICH) |
31 | {//main ctor |
32 | Info("main ctor","Start."); |
33 | |
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34 | fRICH = pRICH; |
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35 | |
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36 | fHitMap = 0; |
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37 | |
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38 | }//main ctor |
39 | //__________________________________________________________________________________________________ |
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40 | void AliRICHClusterFinder::FindLocalMaxima() |
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41 | {// Split the cluster according to the number of maxima inside |
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42 | Info("FindLocalMaxima","Start."); |
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43 | Int_t Nlocal = 0; |
44 | Int_t localX[100],localY[100]; |
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45 | for(Int_t iDig1=0;iDig1<fCurrentCluster.Size();iDig1++) { |
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46 | Int_t iNotMax = 0; |
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47 | AliRICHdigit *pDig1 = (AliRICHdigit *)fCurrentCluster.Digits()->At(iDig1); |
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48 | Int_t padX1 = pDig1->X(); |
49 | Int_t padY1 = pDig1->Y(); |
50 | Double_t padQ1 = pDig1->Q(); |
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51 | for(Int_t iDig2=0;iDig2<fCurrentCluster.Size();iDig2++) { |
52 | AliRICHdigit *pDig2 = (AliRICHdigit *)fCurrentCluster.Digits()->At(iDig2); |
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53 | Int_t padX2 = pDig2->X(); |
54 | Int_t padY2 = pDig2->Y(); |
55 | Double_t padQ2 = pDig2->Q(); |
56 | if(iDig1==iDig2) continue; |
57 | Int_t diffx = TMath::Sign(padX1-padX2,1); |
58 | Int_t diffy = TMath::Sign(padY1-padY2,1); |
59 | if((diffx+diffy)<=1) { |
60 | if(padQ2>padQ1) iNotMax++; |
61 | } |
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62 | } |
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63 | if(iNotMax==0) { |
64 | localX[Nlocal] = padX1; |
65 | localY[Nlocal] = padY1; |
66 | Nlocal++; |
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67 | } |
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68 | } |
69 | }//FindLocalMaxima() |
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70 | //__________________________________________________________________________________________________ |
71 | void AliRICHClusterFinder::Exec() |
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72 | { |
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73 | Info("Exec","Start."); |
74 | |
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75 | |
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76 | Rich()->GetLoader()->LoadDigits(); |
77 | |
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78 | Rich()->GetLoader()->GetRunLoader()->LoadHeader(); |
79 | Rich()->GetLoader()->GetRunLoader()->LoadKinematics(); |
80 | |
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81 | for(Int_t iEventN=0;iEventN<gAlice->GetEventsPerRun();iEventN++){//events loop |
82 | gAlice->GetRunLoader()->GetEvent(iEventN); |
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83 | |
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84 | Rich()->GetLoader()->MakeTree("R"); Rich()->MakeBranch("R"); |
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85 | Rich()->ResetDigits(); Rich()->ResetClusters(); |
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86 | |
87 | Rich()->GetLoader()->TreeD()->GetEntry(0); |
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88 | for(Int_t iChamber=1;iChamber<=kNCH;iChamber++){//chambers loop |
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89 | FindClusters(iChamber); |
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90 | }//chambers loop |
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91 | Rich()->GetLoader()->TreeR()->Fill(); |
92 | Rich()->GetLoader()->WriteRecPoints("OVERWRITE"); |
93 | }//events loop |
94 | Rich()->GetLoader()->UnloadDigits(); Rich()->GetLoader()->UnloadRecPoints(); |
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95 | Rich()->ResetDigits(); Rich()->ResetClusters(); |
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96 | |
97 | Rich()->GetLoader()->GetRunLoader()->UnloadHeader(); |
98 | Rich()->GetLoader()->GetRunLoader()->UnloadKinematics(); |
99 | |
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100 | Info("Exec","Stop."); |
101 | }//Exec() |
102 | //__________________________________________________________________________________________________ |
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103 | void AliRICHClusterFinder::FindClusters(Int_t iChamber) |
104 | { |
105 | //finds neighbours and fill the tree with raw clusters |
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106 | Int_t nDigits=Rich()->Digits(iChamber)->GetEntriesFast(); |
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107 | Info("FindClusters","Start for Chamber %i with %i digits.",iChamber,nDigits); |
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108 | if(nDigits==0)return; |
109 | |
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110 | fHitMap=new AliRICHMap(Rich()->Digits(iChamber));//create digit map for the given chamber |
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111 | |
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112 | for(Int_t iDig=0;iDig<nDigits;iDig++){ |
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113 | AliRICHdigit *dig=(AliRICHdigit*)Rich()->Digits(iChamber)->At(iDig); |
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114 | Int_t i=dig->X(); Int_t j=dig->Y(); |
115 | if(fHitMap->TestHit(i,j)==kUsed) continue; |
116 | |
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117 | FormRawCluster(i,j); |
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118 | |
119 | if(AliRICHParam::IsResolveClusters()) { |
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120 | ResolveCluster(); // ResolveCluster serialization will happen inside |
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121 | } else { |
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122 | WriteRawCluster(); // simply output of the RawCluster found without deconvolution |
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123 | } |
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124 | fCurrentCluster.Reset(); |
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125 | }//digits loop |
126 | |
127 | delete fHitMap; |
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128 | Info("FindClusters","Stop."); |
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129 | |
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130 | }//FindClusters() |
131 | //__________________________________________________________________________________________________ |
132 | void AliRICHClusterFinder::FindClusterContribs() |
133 | { |
134 | //finds CombiPid for a given cluster |
135 | Info("FindClusterContribs","Start"); |
136 | |
137 | TObjArray *pDigits = fCurrentCluster.Digits(); |
138 | Int_t iNmips=0,iNckovs=0,iNfeeds=0; |
139 | TArrayI contribs(3*fCurrentCluster.Size()); |
140 | Int_t *pindex = new Int_t[3*fCurrentCluster.Size()]; |
141 | for(Int_t iDigN=0;iDigN<fCurrentCluster.Size();iDigN++) {//loop on digits of a given cluster |
142 | contribs[3*iDigN] =((AliRICHdigit*)pDigits->At(iDigN))->Tid(0); |
143 | contribs[3*iDigN+1]=((AliRICHdigit*)pDigits->At(iDigN))->Tid(1); |
144 | contribs[3*iDigN+2]=((AliRICHdigit*)pDigits->At(iDigN))->Tid(2); |
145 | cout << "TID1 " << contribs[3*iDigN] << " TID2 " << contribs[3*iDigN+1] << " TID3 " << contribs[3*iDigN+2] << endl; |
146 | }//loop on digits of a given cluster |
147 | TMath::Sort(contribs.GetSize(),contribs.GetArray(),pindex); |
148 | for(Int_t iDigN=0;iDigN<3*fCurrentCluster.Size()-1;iDigN++) {//loop on digits to sort Tid |
149 | cout << " contrib " << contribs[pindex[iDigN]] << " digit " << iDigN << |
150 | " contrib " << contribs[pindex[iDigN+1]] << " digit " << iDigN+1 << endl; |
151 | if(contribs[pindex[iDigN]]!=contribs[pindex[iDigN+1]]) { |
152 | Int_t code = Rich()->GetLoader()->GetRunLoader()->Stack()->Particle(contribs[pindex[iDigN]])->GetPdgCode(); |
153 | Double_t charge = Rich()->GetLoader()->GetRunLoader()->Stack()->Particle(contribs[pindex[iDigN]])->GetPDG()->Charge(); |
154 | |
155 | if(code==50000050) iNckovs++; |
156 | else if(code==50000051) iNfeeds++; |
157 | else if(charge!=0) iNmips++; |
158 | if (contribs[pindex[iDigN+1]]==kBad) break; |
159 | } |
160 | }//loop on digits to sort Tid |
161 | fCurrentCluster.SetCombiPid(iNckovs,iNfeeds,iNmips); |
162 | fCurrentCluster.Print(); |
163 | delete [] pindex; |
164 | }// FindClusterContribs() |
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165 | //__________________________________________________________________________________________________ |
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166 | void AliRICHClusterFinder::FormRawCluster(Int_t i, Int_t j) |
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167 | { |
168 | // Builder of the final Raw Cluster (before deconvolution) |
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169 | Info("FormRawCluster","Start with digit(%i,%i)",i,j); |
170 | |
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171 | fCurrentCluster.AddDigit((AliRICHdigit*) fHitMap->GetHit(i,j)); |
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172 | fHitMap->FlagHit(i,j);// Flag hit as taken |
173 | |
174 | Int_t listX[4], listY[4]; // Now look recursively for all neighbours |
175 | for (Int_t iNeighbour=0;iNeighbour<Rich()->Param()->PadNeighbours(i,j,listX,listY);iNeighbour++) |
176 | if(fHitMap->TestHit(listX[iNeighbour],listY[iNeighbour])==kUnused) |
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177 | FormRawCluster(listX[iNeighbour],listY[iNeighbour]); |
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178 | }//AddDigit2Cluster() |
179 | //__________________________________________________________________________________________________ |
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180 | void AliRICHClusterFinder::ResolveCluster() |
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181 | {// Decluster algorithm |
182 | Info("ResolveCluster","Start."); |
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183 | |
184 | fCurrentCluster.CoG(); // first initial approxmation of the CoG...to start minimization. |
185 | fCurrentCluster.Print(); |
186 | switch (fCurrentCluster.Size()) { |
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187 | |
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188 | case 1: |
189 | WriteRawCluster(); break; |
190 | case 2: |
191 | FitCoG(); |
192 | WriteRawCluster(); break; |
193 | |
194 | default: |
195 | WriteRawCluster(); break; |
196 | } |
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197 | }//ResolveCluster() |
198 | //__________________________________________________________________________________________________ |
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199 | void AliRICHClusterFinder::WriteRawCluster() |
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200 | {// out the current RawCluster |
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201 | Info("WriteRawCluster","Start."); |
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202 | |
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203 | FindClusterContribs(); |
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204 | Rich()->AddCluster(fCurrentCluster); |
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205 | |
206 | }//WriteRawCluster() |
207 | //__________________________________________________________________________________________________ |
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208 | void AliRICHClusterFinder::FitCoG() |
209 | {// Fit cluster size 2 by single Mathieson |
210 | Info("FitCoG","Start."); |
211 | |
212 | TMinuit *pMinuit = new TMinuit(2); |
213 | |
214 | Double_t arglist; |
215 | Int_t ierflag = 0; |
216 | |
217 | static Double_t vstart[2]; |
218 | static Double_t lower[2], upper[2]; |
219 | static Double_t step[2]={0.001,0.001}; |
220 | |
221 | TString chname; |
222 | Int_t ierflg; |
223 | |
224 | pMinuit->SetObjectFit((TObject*)this); |
225 | pMinuit->SetFCN(RICHMinMathieson); |
226 | pMinuit->mninit(5,10,7); |
227 | |
228 | vstart[0] = fCurrentCluster.X(); |
229 | vstart[1] = fCurrentCluster.Y(); |
230 | |
231 | lower[0] = vstart[0] - 2*AliRICHParam::PadSizeX(); |
232 | upper[0] = vstart[0] + 2*AliRICHParam::PadSizeX(); |
233 | lower[1] = vstart[1] - 2*AliRICHParam::PadSizeY(); |
234 | upper[1] = vstart[1] + 2*AliRICHParam::PadSizeY(); |
235 | |
236 | |
237 | pMinuit->mnparm(0," x position ",vstart[0],step[0],lower[0],upper[0],ierflag); |
238 | pMinuit->mnparm(1," y position ",vstart[1],step[1],lower[1],upper[1],ierflag); |
239 | |
240 | arglist = -1; |
241 | |
242 | pMinuit->SetPrintLevel(-1); |
243 | pMinuit->mnexcm("SET NOGR",&arglist, 1, ierflag); |
244 | pMinuit->mnexcm("SET NOW",&arglist, 1, ierflag); |
245 | arglist = 1; |
246 | pMinuit->mnexcm("SET ERR", &arglist, 1,ierflg); |
247 | arglist = -1; |
248 | pMinuit->mnexcm("SIMPLEX",&arglist, 0, ierflag); |
249 | pMinuit->mnexcm("MIGRAD",&arglist, 0, ierflag); |
250 | pMinuit->mnexcm("EXIT" ,&arglist, 0, ierflag); |
251 | Double_t xCoG,yCoG; |
252 | Double_t eps, b1, b2; |
253 | pMinuit->mnpout(0,chname, xCoG, eps , b1, b2, ierflg); |
254 | pMinuit->mnpout(1,chname, yCoG, eps , b1, b2, ierflg); |
255 | delete pMinuit; |
256 | } |
257 | //__________________________________________________________________________________________________ |
258 | void RICHMinMathieson(Int_t &, Double_t *, Double_t &chi2, Double_t *par, Int_t iflag) |
259 | {// Minimization function of Mathieson |
260 | |
261 | AliRICHcluster *pRawCluster = ((AliRICHClusterFinder*)gMinuit->GetObjectFit())->GetCurrentCluster(); |
262 | |
263 | TVector3 centroid(par[0],par[1],0); |
264 | |
265 | chi2 = 0; |
266 | Int_t qtot = pRawCluster->Q(); |
267 | for(Int_t i=0;i<pRawCluster->Size();i++) { |
268 | Int_t padX = ((AliRICHdigit *)pRawCluster->Digits()->At(i))->X(); |
269 | Int_t padY = ((AliRICHdigit *)pRawCluster->Digits()->At(i))->Y(); |
270 | Double_t padQ = ((AliRICHdigit *)pRawCluster->Digits()->At(i))->Q(); |
271 | chi2 += TMath::Power((qtot*AliRICHParam::Loc2PadFrac(centroid,padX,padY)-padQ),2)/padQ; |
272 | } |
273 | if(iflag == 3) |
274 | { |
275 | cout << " --- end convergence...summary --- " << endl; |
276 | cout << " x position " << par[0] << endl; |
277 | cout << " y position " << par[1] << endl; |
278 | cout << " chi2 " << chi2 << endl; |
279 | } |
280 | }//RICHMinMathieson() |