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[u/mrichter/AliRoot.git] / RICH / AliRICHClusterFinder.cxx
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8265fa96 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
8265fa96 16
17#include "AliRICHClusterFinder.h"
543d5224 18#include "AliRICHMap.h"
9d6f9427 19#include <TMinuit.h>
ed3ceb24 20#include <TParticle.h>
9d6f9427 21#include <TVector3.h>
cbaf35fb 22#include <AliLoader.h>
ed3ceb24 23#include <AliStack.h>
cbaf35fb 24#include <AliRun.h>
781ec278 25#include "AliRICHParam.h"
8265fa96 26
9d6f9427 27void RICHMinMathieson(Int_t &npar, Double_t *gin, Double_t &chi2, Double_t *par, Int_t iflag);
8265fa96 28
29ClassImp(AliRICHClusterFinder)
543d5224 30//__________________________________________________________________________________________________
0fe8fa07 31AliRICHClusterFinder::AliRICHClusterFinder(AliRunLoader *pRunLoader)
543d5224 32{//main ctor
0fe8fa07 33 fRICH = (AliRICH*) pRunLoader->GetAliRun()->GetDetector("RICH");
34
998b831f 35 AliDebug(1,"main ctor Start.");
543d5224 36
e42a7b46 37 fDigitMap = 0;
6865fb8d 38 fRawCluster.Reset();
39 fResolvedCluster.Reset();
998b831f 40 AliDebug(1,"main ctor Stop.");
543d5224 41}//main ctor
42//__________________________________________________________________________________________________
d3eb6079 43void AliRICHClusterFinder::Exec(const Option_t *)
237c933d 44{
e42a7b46 45//Main method of cluster finder. Loops on events and chambers, everything else is done in FindClusters()
998b831f 46 AliDebug(1,"Exec Start.");
e42a7b46 47
48 R()->GetLoader() ->LoadDigits();
998b831f 49// R()->GetLoader()->GetRunLoader()->LoadHeader();
d3eb6079 50 if(!R()->GetLoader()->GetRunLoader()->TreeK()) R()->GetLoader()->GetRunLoader()->LoadKinematics();
ed3ceb24 51
543d5224 52 for(Int_t iEventN=0;iEventN<gAlice->GetEventsPerRun();iEventN++){//events loop
998b831f 53 AliDebug(1,Form("Processing event %i...",iEventN));
e42a7b46 54 R()->GetLoader()->GetRunLoader()->GetEvent(iEventN);
237c933d 55
e42a7b46 56 R()->GetLoader()->MakeTree("R"); R()->MakeBranch("R");
0fe8fa07 57 R()->ResetDigits(); R()->ClustersReset();
543d5224 58
e42a7b46 59 R()->GetLoader()->TreeD()->GetEntry(0);
998b831f 60 for(Int_t iChamber=1;iChamber<=kNchambers;iChamber++){//chambers loop
ed3ceb24 61 FindClusters(iChamber);
543d5224 62 }//chambers loop
e42a7b46 63 R()->GetLoader()->TreeR()->Fill(); R()->GetLoader()->WriteRecPoints("OVERWRITE");//write out clusters for current event
543d5224 64 }//events loop
ed3ceb24 65
e42a7b46 66 R()->ResetDigits();//reset and unload everything
0fe8fa07 67 R()->ClustersReset();
e42a7b46 68 R()->GetLoader() ->UnloadDigits();
69 R()->GetLoader() ->UnloadRecPoints();
998b831f 70// R()->GetLoader()->GetRunLoader()->UnloadHeader();
e42a7b46 71 R()->GetLoader()->GetRunLoader()->UnloadKinematics();
ed3ceb24 72
998b831f 73 AliDebug(1,"Stop.");
543d5224 74}//Exec()
75//__________________________________________________________________________________________________
ed3ceb24 76void AliRICHClusterFinder::FindClusters(Int_t iChamber)
77{
e42a7b46 78//Loops on digits for a given chamber, forms raw clusters, then tries to resolve them if requested
79 Int_t iNdigits=R()->Digits(iChamber)->GetEntriesFast();
998b831f 80 AliDebug(1,Form("Start for chamber %i with %i digits.",iChamber,iNdigits));
e42a7b46 81
82 if(iNdigits==0)return;//no digits for a given chamber, nothing to do
cbaf35fb 83
e42a7b46 84 fDigitMap=new AliRICHMap(R()->Digits(iChamber));//create digit map for the given chamber
cbaf35fb 85
e42a7b46 86 for(Int_t iDigN=0;iDigN<iNdigits;iDigN++){//digits loop for a given chamber
0fe8fa07 87 AliRICHDigit *dig=(AliRICHDigit*)R()->Digits(iChamber)->At(iDigN);
cbaf35fb 88 Int_t i=dig->X(); Int_t j=dig->Y();
e42a7b46 89 if(fDigitMap->TestHit(i,j)==kUsed) continue;//this digit is already taken, go after next digit
cbaf35fb 90
e42a7b46 91 FormRawCluster(i,j);//form raw cluster starting from (i,j) pad
998b831f 92 AliDebug(1,"After FormRawCluster:");ToAliDebug(1,fRawCluster.Print());
e42a7b46 93 FindLocalMaxima(); //find number of local maxima and initial center of gravity
998b831f 94 AliDebug(1,"After FindLocalMaxima:");ToAliDebug(1,fRawCluster.Print());
6865fb8d 95
77bc1a05 96 if(AliRICHParam::IsResolveClusters()&&fNlocals<=6&&fRawCluster.Size()>1){
e42a7b46 97 FitCoG(); //serialization of resolved clusters will happen inside
98 }else{//cluster size=1 or resolving is switched off
99 WriteRawCluster();//simply output the formed raw cluster without deconvolution
ed3ceb24 100 }
e42a7b46 101 fRawCluster.Reset(); fResolvedCluster.Reset();
102 }//digits loop for a given chamber
cbaf35fb 103
e42a7b46 104 delete fDigitMap;
cbaf35fb 105
998b831f 106 AliDebug(1,"Stop.");
ed3ceb24 107}//FindClusters()
108//__________________________________________________________________________________________________
0fe8fa07 109void AliRICHClusterFinder::FindClusterContribs(AliRICHCluster *pCluster)
ed3ceb24 110{
e42a7b46 111//Finds cerenkov-feedback-mip mixture for a given cluster
998b831f 112 AliDebug(1,"Start.");ToAliDebug(1,pCluster->Print());
e0b2e10c 113
781ec278 114// R()->GetLoader()->GetRunLoader()->LoadHeader(); //...message from AliRunLoader...hopefully will disappear in future...
115 // sometimes no stack found if the above line is commented out!!
e0b2e10c 116 AliStack *pStack = R()->GetLoader()->GetRunLoader()->Stack();
117 if(!pStack)
118 {AliInfo("No Stack found!!! No contrib to cluster found.");return;}
ed3ceb24 119
6865fb8d 120 TObjArray *pDigits = pCluster->Digits();
e42a7b46 121 if(!pDigits) return; //??????????
ed3ceb24 122 Int_t iNmips=0,iNckovs=0,iNfeeds=0;
6865fb8d 123 TArrayI contribs(3*pCluster->Size());
124 Int_t *pindex = new Int_t[3*pCluster->Size()];
125 for(Int_t iDigN=0;iDigN<pCluster->Size();iDigN++) {//loop on digits of a given cluster
0fe8fa07 126 contribs[3*iDigN] =((AliRICHDigit*)pDigits->At(iDigN))->GetTrack(0);
89924db8 127 if (contribs[3*iDigN] >= 10000000) contribs[3*iDigN] = 0;
0fe8fa07 128 contribs[3*iDigN+1]=((AliRICHDigit*)pDigits->At(iDigN))->GetTrack(1);
89924db8 129 if (contribs[3*iDigN+1] >= 10000000) contribs[3*iDigN+1] = 0;
0fe8fa07 130 contribs[3*iDigN+2]=((AliRICHDigit*)pDigits->At(iDigN))->GetTrack(2);
89924db8 131 if (contribs[3*iDigN+2] >= 10000000) contribs[3*iDigN+2] = 0;
ed3ceb24 132 }//loop on digits of a given cluster
133 TMath::Sort(contribs.GetSize(),contribs.GetArray(),pindex);
e42a7b46 134 for(Int_t iDigN=0;iDigN<3*pCluster->Size()-1;iDigN++) {//loop on digits to sort tids
998b831f 135 AliDebug(1,Form("%4i for digit n. %4i",contribs[pindex[iDigN]],iDigN));
ed3ceb24 136 if(contribs[pindex[iDigN]]!=contribs[pindex[iDigN+1]]) {
08999534 137 Int_t thecontrib = contribs[pindex[iDigN]];
138 if (thecontrib>=pStack->GetNtrack()) continue;//PH this should not happen
139 TParticle* particle = pStack->Particle(thecontrib);
140 if (!particle) continue;//PH this should not happen
89924db8 141 Int_t code = particle->GetPdgCode();
142 Double_t charge = 0;
e42a7b46 143 if(particle->GetPDG()) charge=particle->GetPDG()->Charge();
998b831f 144 AliDebug(1,Form(" charge of particle %f",charge));
ed3ceb24 145
146 if(code==50000050) iNckovs++;
e42a7b46 147 if(code==50000051) iNfeeds++;
148 if(charge!=0) iNmips++;
ed3ceb24 149 }
150 }//loop on digits to sort Tid
e42a7b46 151
0fe8fa07 152 if (contribs[pindex[3*pCluster->Size()-1]]!=-1) {
38c1fcd3 153 Int_t thecontrib = contribs[pindex[3*pCluster->Size()-1]];
154 if (thecontrib<pStack->GetNtrack()){
155 //PH the opposite should not happen
e42a7b46 156
38c1fcd3 157 TParticle* particle = pStack->Particle(thecontrib);
158 if (particle) {
159 //PH the opposite should not happen
160 Int_t code = particle->GetPdgCode();
161 Double_t charge = 0;
162 if(particle->GetPDG()) charge=particle->GetPDG()->Charge();
163 AliDebug(1,Form(" charge of particle %f",charge));
164 if(code==50000050) iNckovs++;
165 if(code==50000051) iNfeeds++;
166 if(charge!=0) iNmips++;
167 }
168 }
e42a7b46 169 }
170
171 pCluster->CFM(iNckovs,iNfeeds,iNmips);
172//
ed3ceb24 173 delete [] pindex;
998b831f 174 ToAliDebug(1,pCluster->Print());
175 AliDebug(1,"Stop.");
3582c1f9 176}//FindClusterContribs()
cbaf35fb 177//__________________________________________________________________________________________________
9d6f9427 178void AliRICHClusterFinder::FormRawCluster(Int_t i, Int_t j)
ed3ceb24 179{
e42a7b46 180//Builds the raw cluster (before deconvolution). Starts from the first pad (i,j) then calls itself recursevly for all neighbours.
0fe8fa07 181 AliDebug(1,Form("Start with digit(%i,%i) Q=%f",i,j,((AliRICHDigit*)fDigitMap->GetHit(i,j))->Q()));
cbaf35fb 182
0fe8fa07 183 fRawCluster.AddDigit((AliRICHDigit*) fDigitMap->GetHit(i,j));//take this pad in cluster
e42a7b46 184 fDigitMap->FlagHit(i,j);//flag this pad as taken
cbaf35fb 185
186 Int_t listX[4], listY[4]; // Now look recursively for all neighbours
e42a7b46 187 for (Int_t iNei=0;iNei<R()->P()->PadNeighbours(i,j,listX,listY);iNei++)
188 if(fDigitMap->TestHit(listX[iNei],listY[iNei])==kUnused) FormRawCluster(listX[iNei],listY[iNei]);
3582c1f9 189}//FormRawCluster()
cbaf35fb 190//__________________________________________________________________________________________________
e42a7b46 191void AliRICHClusterFinder::FindLocalMaxima()
192{
193//find number of local maxima in the current raw cluster and then calculates initial center of gravity
194 fNlocals=0;
781ec278 195 AliDebug(1,Form("Cluster size of the Raw cluster ---> %i",fRawCluster.Size()));
e42a7b46 196 for(Int_t iDig1=0;iDig1<fRawCluster.Size();iDig1++) {
197 Int_t iNotMax = 0;
0fe8fa07 198 AliRICHDigit *pDig1 = (AliRICHDigit *)fRawCluster.Digits()->At(iDig1);
781ec278 199 if(!pDig1) {fNlocals=0;return;}
e42a7b46 200 TVector pad1 = pDig1->Pad();
201 Int_t padQ1 = (Int_t)(pDig1->Q()+0.1);
202 Int_t padC1 = pDig1->ChFbMi();
203 for(Int_t iDig2=0;iDig2<fRawCluster.Size();iDig2++) {
0fe8fa07 204 AliRICHDigit *pDig2 = (AliRICHDigit *)fRawCluster.Digits()->At(iDig2);
781ec278 205 if(!pDig2) {fNlocals=0;return;}
e42a7b46 206 TVector pad2 = pDig2->Pad();
207 Int_t padQ2 = (Int_t)(pDig2->Q()+0.1);
208 if(iDig1==iDig2) continue;
209 Int_t diffx = TMath::Sign(Int_t(pad1[0]-pad2[0]),1);
210 Int_t diffy = TMath::Sign(Int_t(pad1[1]-pad2[1]),1);
211 if((diffx+diffy)<=1) {
212 if(padQ2>=padQ1) iNotMax++;
213 }
214 }
215 if(iNotMax==0) {
216 TVector2 x2=AliRICHParam::Pad2Loc(pad1);
217 fLocalX[fNlocals]=x2.X();fLocalY[fNlocals]=x2.Y();
218 fLocalQ[fNlocals] = (Double_t)padQ1;
219 fLocalC[fNlocals] = padC1;
220 fNlocals++;
221 }
222 }
781ec278 223 AliDebug(1,Form("Number of local maxima found ---> %i",fNlocals));
e42a7b46 224 fRawCluster.CoG(fNlocals); //first initial approximation of the CoG...to start minimization.
225}//FindLocalMaxima()
cbaf35fb 226//__________________________________________________________________________________________________
9d6f9427 227void AliRICHClusterFinder::WriteRawCluster()
6865fb8d 228{
e42a7b46 229//Add the current raw cluster to the list of clusters
998b831f 230 AliDebug(1,"Start.");
cbaf35fb 231
e42a7b46 232 FindClusterContribs(&fRawCluster);
0fe8fa07 233 R()->ClusterAdd(fRawCluster);
e42a7b46 234
998b831f 235 ToAliDebug(1,fRawCluster.Print()); AliDebug(1,"Stop.");
cbaf35fb 236}//WriteRawCluster()
237//__________________________________________________________________________________________________
6865fb8d 238void AliRICHClusterFinder::WriteResolvedCluster()
239{
e42a7b46 240//Add the current resolved cluster to the list of clusters
998b831f 241 AliDebug(1,"Start.");
6865fb8d 242
781ec278 243 FindClusterContribs(&fResolvedCluster);
0fe8fa07 244 R()->ClusterAdd(fResolvedCluster);
6865fb8d 245
998b831f 246 ToAliDebug(1,fResolvedCluster.Print()); AliDebug(1,"Stop.");
6865fb8d 247}//WriteResolvedCluster()
248//__________________________________________________________________________________________________
9d6f9427 249void AliRICHClusterFinder::FitCoG()
e42a7b46 250{
251//Fits cluster of size by the corresponding number of Mathieson shapes.
252//This methode is only invoked in case everything is ok to start deconvolution
998b831f 253 AliDebug(1,"Start with:"); ToAliDebug(1,fRawCluster.Print());
6865fb8d 254
0f72f306 255 Double_t arglist;
256 Int_t ierflag = 0;
6865fb8d 257
781ec278 258 AliDebug(1,Form("MINUIT Started with %i parameters and %i local maxima",3*fNlocals-1,fNlocals));
259
260// TMinuit *pMinuit = new TMinuit(3*fNlocals-1);
261 TMinuit *pMinuit = new TMinuit(100);
0f72f306 262 pMinuit->mninit(5,10,7);
263
264 arglist = -1;
265 pMinuit->mnexcm("SET PRI",&arglist, 1, ierflag);
19dd5b2f 266 pMinuit->mnexcm("SET NOW",&arglist, 0, ierflag);
9d6f9427 267
9d6f9427 268 TString chname;
269 Int_t ierflg;
270
271 pMinuit->SetObjectFit((TObject*)this);
272 pMinuit->SetFCN(RICHMinMathieson);
6865fb8d 273
274 Double_t vstart,lower, upper;
77bc1a05 275 Double_t stepX= 0.01;
276 Double_t stepY= 0.01;
277 Double_t stepQ= 0.01;
6865fb8d 278
279 for(Int_t i=0;i<fNlocals;i++) {
781ec278 280 AliDebug(1,Form(" local minimum n. %i with Xstart %f and Ystart %f",i,fLocalX[i],fLocalY[i]));
6865fb8d 281 vstart = fLocalX[i];
282 lower = vstart - 2*AliRICHParam::PadSizeX();
283 upper = vstart + 2*AliRICHParam::PadSizeX();
284 pMinuit->mnparm(3*i ,Form("xCoG %i",i),vstart,stepX,lower,upper,ierflag);
781ec278 285 AliDebug(1,Form("xCoG %i vstart %f lower %f upper %f ",i,vstart,lower,upper));
286
6865fb8d 287 vstart = fLocalY[i];
288 lower = vstart - 2*AliRICHParam::PadSizeY();
289 upper = vstart + 2*AliRICHParam::PadSizeY();
290 pMinuit->mnparm(3*i+1,Form("yCoG %i",i),vstart,stepY,lower,upper,ierflag);
781ec278 291 AliDebug(1,Form("yCoG %i vstart %f lower %f upper %f ",i,vstart,lower,upper));
6865fb8d 292 if(i==fNlocals-1) break; // last parameter is constrained
293 vstart = fLocalQ[i]/fRawCluster.Q();
294 lower = 0;
295 upper = 1;
296 pMinuit->mnparm(3*i+2,Form("qfrac %i",i),vstart,stepQ,lower,upper,ierflag);
781ec278 297 AliDebug(1,Form("qfrac %i vstart %f lower %f upper %f ",i,vstart,lower,upper));
6865fb8d 298 }
299
9d6f9427 300 arglist = -1;
9d6f9427 301 pMinuit->mnexcm("SET NOGR",&arglist, 1, ierflag);
9d6f9427 302 arglist = 1;
303 pMinuit->mnexcm("SET ERR", &arglist, 1,ierflg);
304 arglist = -1;
305 pMinuit->mnexcm("SIMPLEX",&arglist, 0, ierflag);
306 pMinuit->mnexcm("MIGRAD",&arglist, 0, ierflag);
781ec278 307// pMinuit->mnexcm("EXIT" ,&arglist, 0, ierflag);
308
6865fb8d 309 Double_t xCoG[50],yCoG[50],qfracCoG[50];
9d6f9427 310 Double_t eps, b1, b2;
6865fb8d 311
312 Double_t qfraclast=0;
313 for(Int_t i=0;i<fNlocals;i++) {
314 pMinuit->mnpout(3*i ,chname, xCoG[i], eps , b1, b2, ierflg);
315 pMinuit->mnpout(3*i+1,chname, yCoG[i], eps , b1, b2, ierflg);
316 if(i==fNlocals-1) break;
317 pMinuit->mnpout(3*i+2,chname, qfracCoG[i], eps , b1, b2, ierflg);
318 qfraclast+=qfracCoG[i];
319 }
320 qfracCoG[fNlocals-1] = 1 - qfraclast;
781ec278 321
9d6f9427 322 delete pMinuit;
6865fb8d 323
e42a7b46 324 for(Int_t i=0;i<fNlocals;i++){//resolved positions loop
6865fb8d 325 fResolvedCluster.Fill(&fRawCluster,xCoG[i],yCoG[i],qfracCoG[i],fLocalC[i]);
6865fb8d 326 WriteResolvedCluster();
327 }
781ec278 328
329
998b831f 330 AliDebug(1,"Stop.");
781ec278 331
09c52ebc 332}//FitCoG()
9d6f9427 333//__________________________________________________________________________________________________
6865fb8d 334void RICHMinMathieson(Int_t &npar, Double_t *, Double_t &chi2, Double_t *par, Int_t )
09c52ebc 335{
e42a7b46 336//Mathieson minimization function
9d6f9427 337
0fe8fa07 338 AliRICHCluster *pRawCluster = ((AliRICHClusterFinder*)gMinuit->GetObjectFit())->GetRawCluster();
9d6f9427 339
3582c1f9 340 TVector2 centroid[50];
6865fb8d 341 Double_t q[50];
342 Int_t nFunctions = (npar+1)/3;
343 Double_t qfract = 0;
344 for(Int_t i=0;i<nFunctions;i++) {
3582c1f9 345 centroid[i].Set(par[3*i],par[3*i+1]);
6865fb8d 346 if(i==nFunctions-1) break;
347 q[i]=par[3*i+2];
348 qfract+=q[i];
349 }
350 q[nFunctions-1] = 1 - qfract;
351
9d6f9427 352 chi2 = 0;
353 Int_t qtot = pRawCluster->Q();
354 for(Int_t i=0;i<pRawCluster->Size();i++) {
0fe8fa07 355 TVector pad=((AliRICHDigit *)pRawCluster->Digits()->At(i))->Pad();
356 Double_t padQ = ((AliRICHDigit *)pRawCluster->Digits()->At(i))->Q();
6865fb8d 357 Double_t qfracpar=0;
358 for(Int_t j=0;j<nFunctions;j++) {
e42a7b46 359 qfracpar += q[j]*AliRICHParam::FracQdc(centroid[j],pad);
9d6f9427 360 }
6865fb8d 361 chi2 += TMath::Power((qtot*qfracpar-padQ),2)/padQ;
6865fb8d 362 }
9d6f9427 363}//RICHMinMathieson()
e42a7b46 364//__________________________________________________________________________________________________