RICH/AliRICH.cxx

   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
  16 #include "AliRICH.h"
  17 #include "AliRICHParam.h"
  18 #include "AliRICHChamber.h"
  19 #include "AliRICHClusterFinder.h"
  20 #include <TArrayF.h>
  21 #include <TGeometry.h>
  22 #include <TBRIK.h>
  23 #include <TTUBE.h>
  24 #include <TFile.h>
  25 #include <TNode.h>
  26 #include <TObjArray.h>
  27 #include <TParticle.h>
  28 #include <AliStack.h>
  29 #include <AliMagF.h>
  30 #include <AliRun.h>
  31 #include <AliRunDigitizer.h>
  32 #include <AliMC.h>
  33 #include <TVirtualMC.h>
  34
  35 ClassImp(AliRICHhit)
  36 //__________________________________________________________________________________________________
  37 void AliRICHhit::Print(Option_t*)const
  38 {
  39   ::Info("hit","Ch=%1i, TID=%6i, eloss=%9.3f eV, in-out dist=%9.4f, OUT(%7.2f,%7.2f,%7.2f)"
  40       ,fChamber,fTrack,fEloss*1e9,Length(),fOutX3.X(),fOutX3.Y(),fOutX3.Z());
  41 }
  42 //__________________________________________________________________________________________________
  43 ClassImp(AliRICHdigit)
  44 //__________________________________________________________________________________________________
  45 void AliRICHdigit::Print(Option_t*)const
  46 {
  47   ::Info("digit","csxy=%6i, cfm=%9i, c=%2i, x=%3i, y=%3i, q=%8.3f, TID1=%5i, TID2=%5i, TID3=%5i",
  48                   Id(),fChFbMip,fChamber,fPadX,fPadY,fQdc,fTracks[0],fTracks[1],fTracks[2]);
  49 }
  50 //__________________________________________________________________________________________________
  51 ClassImp(AliRICHcluster)
  52 //__________________________________________________________________________________________________
  53 void AliRICHcluster::Print(Option_t*)const
  54 {
  55   ::Info("cluster","CombiPid=%10i, c=%2i, size=%6i, dim=%5i, x=%7.3f, y=%7.3f, Q=%6i, st=%i",
  56            fCombiPid,fChamber,fSize,fDimXY,fX,fY,fQdc,fStatus);
  57 }
  58 //__________________________________________________________________________________________________
  59 ClassImp(AliRICHreco)
  60 //__________________________________________________________________________________________________
  61 void AliRICHreco::Print(Option_t*)const
  62 {
  63   ::Info("reco","ThetaCherenkov=%9.6f, Nphotons=%4i, TID=%9i",fThetaCherenkov,fNphotons,fTid);
  64 }
  65 //__________________________________________________________________________________________________
  66 ClassImp(AliRICH)
  67 //__________________________________________________________________________________________________
  68 // RICH manager class
  69 //BEGIN_HTML
  70 /*
  71   <img src="gif/alirich.gif">
  72 */
  73 //END_HTML
  74 //__________________________________________________________________________________________________
  75 AliRICH::AliRICH()
  76         :AliDetector()
  77 {
  78 //Default ctor should not contain any new operators
  79   fpParam     =0;
  80   fChambers   =0;
  81 //AliDetector ctor deals with Hits and Digits
  82   fSdigits    =0; fNsdigits   =0;
  83   fDigitsNew  =0; for(int i=0;i<kNCH;i++) fNdigitsNew[i]  =0;
  84   fClusters   =0; for(int i=0;i<kNCH;i++) fNclusters[i]=0;
  85   fRecos      =0; fNrecos     =0;
  86 }//AliRICH::AliRICH()
  87 //__________________________________________________________________________________________________
  88 AliRICH::AliRICH(const char *name, const char *title)
  89         :AliDetector(name,title)
  90 {
  91 //Named ctor
  92   if(GetDebug())Info("named ctor","Start.");
  93   fpParam     =   new AliRICHParam;
  94   fChambers = 0;  CreateChambers();
  95 //AliDetector ctor deals with Hits and Digits (reset them to 0, does not create them)
  96   fHits=       0;     CreateHits();          gAlice->GetMCApp()->AddHitList(fHits);
  97   fSdigits=    0;
  98   fDigitsNew=  0;
  99   fClusters=   0;
 100   fRecos      =0;
 101   if(GetDebug())Info("named ctor","Stop.");
 102 }//AliRICH::AliRICH(const char *name, const char *title)
 103 //__________________________________________________________________________________________________
 104 AliRICH::~AliRICH()
 105 {
 106 //dtor
 107   if(GetDebug()) Info("dtor","Start.");
 108
 109   if(fpParam)    delete fpParam;
 110   if(fChambers)  delete fChambers;
 111
 112   if(fHits)      delete fHits;
 113   if(fSdigits)   delete fSdigits;
 114   if(fDigits)    delete fDigits;
 115   if(fDigitsNew) {fDigitsNew->Delete();   delete fDigitsNew;}
 116   if(fClusters)  {fClusters->Delete();    delete fClusters;}
 117   if(fRecos)     delete fRecos;
 118   if(GetDebug()) Info("dtor","Stop.");
 119 }//AliRICH::~AliRICH()
 120 //__________________________________________________________________________________________________
 121 void AliRICH::Hits2SDigits()
 122 {
 123 // Create a list of sdigits corresponding to list of hits. Every hit generates one or more sdigits.
 124 //
 125   if(GetDebug()) Info("Hit2SDigits","Start.");
 126   for(Int_t iEventN=0;iEventN<GetLoader()->GetRunLoader()->GetAliRun()->GetEventsPerRun();iEventN++){//events loop
 127     GetLoader()->GetRunLoader()->GetEvent(iEventN);
 128
 129     if(!GetLoader()->TreeH()) GetLoader()->LoadHits();    GetLoader()->GetRunLoader()->LoadHeader();
 130                                                           GetLoader()->GetRunLoader()->LoadKinematics();//from
 131     if(!GetLoader()->TreeS()) GetLoader()->MakeTree("S"); MakeBranch("S");//to
 132
 133     for(Int_t iPrimN=0;iPrimN<GetLoader()->TreeH()->GetEntries();iPrimN++){//prims loop
 134       GetLoader()->TreeH()->GetEntry(iPrimN);
 135       for(Int_t iHitN=0;iHitN<Hits()->GetEntries();iHitN++){//hits loop
 136         AliRICHhit *pHit=(AliRICHhit*)Hits()->At(iHitN);
 137         TVector2 x2 = P()->ShiftToWirePos(C(pHit->C())->Glob2Loc(pHit->OutX3()));
 138         Int_t iTotQdc=P()->TotQdc(x2,pHit->Eloss());
 139         if(iTotQdc==0) continue;
 140         Int_t iPadXmin,iPadXmax,iPadYmin,iPadYmax;
 141         P()->Loc2Area(x2,iPadXmin,iPadYmin,iPadXmax,iPadYmax);//determine affected pads
 142         if(GetDebug()) Info("Hits2SDigits","left-down=(%i,%i) right-up=(%i,%i)",iPadXmin,iPadYmin,iPadXmax,iPadYmax);
 143         for(Int_t iPadY=iPadYmin;iPadY<=iPadYmax;iPadY++)//affected pads loop
 144           for(Int_t iPadX=iPadXmin;iPadX<=iPadXmax;iPadX++){
 145             Double_t padQdc=iTotQdc*P()->FracQdc(x2,iPadX,iPadY);
 146             if(padQdc>0.1) AddSDigit(pHit->C(),iPadX,iPadY,padQdc,
 147               GetLoader()->GetRunLoader()->Stack()->Particle(pHit->GetTrack())->GetPdgCode(),pHit->GetTrack());
 148           }//affected pads loop
 149       }//hits loop
 150     }//prims loop
 151     GetLoader()->TreeS()->Fill();
 152     GetLoader()->WriteSDigits("OVERWRITE");
 153     ResetSDigits();
 154   }//events loop
 155   GetLoader()->UnloadHits(); GetLoader()->GetRunLoader()->UnloadHeader(); GetLoader()->GetRunLoader()->UnloadKinematics();
 156   GetLoader()->UnloadSDigits();
 157   if(GetDebug()) Info("Hit2SDigits","Stop.");
 158 }//Hits2SDigits()
 159 //__________________________________________________________________________________________________
 160 void AliRICH::BuildGeometry()
 161 {
 162 //Builds a TNode geometry for event display
 163   if(GetDebug())Info("BuildGeometry","Start.");
 164
 165   TNode *node, *subnode, *top;
 166   top=gAlice->GetGeometry()->GetNode("alice");
 167
 168   new TBRIK("S_RICH","S_RICH","void",71.09999,11.5,73.15);
 169
 170   Float_t wid=P()->SectorSizeX();
 171   Float_t len=P()->SectorSizeY();
 172   new TBRIK("PHOTO","PHOTO","void",wid/2,0.1,len/2);
 173
 174   for(int i=1;i<=kNCH;i++){
 175     top->cd();
 176     node = new TNode(Form("RICH%i",i),Form("RICH%i",i),"S_RICH",C(i)->X(),C(i)->Y(),C(i)->Z(),C(i)->RotMatrixName());
 177     node->SetLineColor(kRed);
 178     node->cd();
 179     subnode = new TNode("PHOTO1","PHOTO1","PHOTO",wid+P()->DeadZone(),5,len/2+P()->DeadZone()/2,"");
 180     subnode->SetLineColor(kGreen);
 181     fNodes->Add(subnode);
 182     subnode = new TNode("PHOTO1","PHOTO1","PHOTO",0,5,len/2+P()->DeadZone()/2,"");
 183     subnode->SetLineColor(kGreen);
 184     fNodes->Add(subnode);
 185     subnode = new TNode("PHOTO1","PHOTO1","PHOTO",-wid-P()->DeadZone(),5,len/2+P()->DeadZone()/2,"");
 186     subnode->SetLineColor(kGreen);
 187     fNodes->Add(subnode);
 188     subnode = new TNode("PHOTO1","PHOTO1","PHOTO",wid+P()->DeadZone(),5,-len/2-P()->DeadZone()/2,"");
 189     subnode->SetLineColor(kGreen);
 190     fNodes->Add(subnode);
 191     subnode = new TNode("PHOTO1","PHOTO1","PHOTO",0,5,-len/2 -P()->DeadZone()/2,"");
 192     subnode->SetLineColor(kGreen);
 193     fNodes->Add(subnode);
 194     subnode = new TNode("PHOTO1","PHOTO1","PHOTO",-wid-P()->DeadZone(),5,-len/2 - P()->DeadZone()/2,"");
 195     subnode->SetLineColor(kGreen);
 196     fNodes->Add(subnode);
 197     fNodes->Add(node);
 198   }
 199   if(GetDebug())Info("BuildGeometry","Stop.");
 200 }//void AliRICH::BuildGeometry()
 201
 202 //______________________________________________________________________________
 203 void AliRICH::CreateMaterials()
 204 {
 205     //
 206     // *** DEFINITION OF AVAILABLE RICH MATERIALS ***
 207
 208 #include "Opticals.h"
 209
 210   Float_t a=0,z=0,den=0,radl=0,absl=0;
 211   Float_t tmaxfd=-10.0, deemax=-0.2, stemax=-0.1,epsil=0.001, stmin=-0.001;
 212   Int_t   isxfld = gAlice->Field()->Integ();
 213   Float_t sxmgmx = gAlice->Field()->Max();
 214
 215   AliMaterial( 1, "Air     $",a=14.61,z=7.3, den=0.001205,radl=30420.0,absl=67500);//(Air)
 216   AliMedium(1, "DEFAULT MEDIUM AIR$", 1, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 217
 218   AliMaterial( 6, "HON",      a=12.01,z=6.0, den=0.1,     radl=18.8,   absl=0);    //(C)-equivalent radl
 219   AliMedium(2, "HONEYCOMB$", 6, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 220
 221   AliMaterial(16, "CSI",      a=12.01,z=6.0, den=0.1,     radl=18.8,   absl=0);    //CsI-radl equivalent
 222   AliMedium(kCSI, "CSI$", 16, 1, isxfld, sxmgmx,tmaxfd, stemax, deemax, epsil, stmin);
 223
 224   AliMaterial(11, "GRI",      a=63.54,z=29.0,den=8.96,    radl=1.43,   absl=0);    //anode grid (Cu)
 225   AliMedium(7, "GRID$", 11, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 226
 227   AliMaterial(50, "ALUM",     a=26.98,z=13.0,den=2.7,     radl=8.9,    absl=0);    //aluminium sheet (Al)
 228   AliMedium(10, "ALUMINUM$", 50, 1, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 229
 230   AliMaterial(31, "COPPER$",  a=63.54,z=29.0,den=8.96,    radl=1.4,    absl=0);    //(Cu)
 231   AliMedium(12, "PCB_COPPER", 31, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 232
 233   Float_t  aQuartz[2]={28.09,16.0};  Float_t  zQuartz[2]={14.00, 8.0};  Float_t  wmatQuartz[2]={1,2};
 234   AliMixture (20, "QUA",aQuartz,zQuartz,den=2.64,-2, wmatQuartz);//Quarz (SiO2) - trasnparent
 235   AliMedium(3, "QUARTZ$", 20, 1, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 236
 237   AliMixture (21, "QUAO",aQuartz, zQuartz, den=2.64, -2, wmatQuartz);//Quarz (SiO2) - opaque
 238   AliMedium(8, "QUARTZO$", 21, 1, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 239
 240   Float_t  aFreon[2]={12,19};  Float_t  zFreon[2]={6,9};  Float_t wmatFreon[2]={6,14};
 241   AliMixture (30, "FRE",aFreon,zFreon,den=1.7,-2,wmatFreon);//Freon (C6F14)
 242   AliMedium(4, "FREON$", 30, 1, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 243
 244   Float_t aMethane[2]={12.01,1}; Float_t zMethane[2]={6,1}; Float_t wmatMethane[2]={1,4};
 245   AliMixture (40, "MET", aMethane, zMethane, den=7.17e-4,-2, wmatMethane);//methane (CH4)
 246   AliMedium(5, "METHANE$", 40, 1, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 247
 248   AliMixture (41, "METG", aMethane, zMethane, den=7.17e-4, -2, wmatMethane);
 249   AliMedium(kGAP, "GAP$", 41, 1, isxfld, sxmgmx,tmaxfd, 0.1, -deemax, epsil, -stmin);
 250
 251   Float_t aGlass[5]={12.01, 28.09, 16.,   10.8,  23.};
 252   Float_t zGlass[5]={ 6.,   14.,    8.,    5.,   11.};
 253   Float_t wGlass[5]={ 0.5,  0.105, 0.355, 0.03,  0.01};
 254   AliMixture (32, "GLASS",aGlass, zGlass, den=1.74, 5, wGlass);//Glass 50%C+10.5%Si+35.5%O+3% + 1%
 255   AliMedium(11, "GLASS", 32, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 256
 257   Int_t *idtmed = fIdtmed->GetArray()-999;
 258   gMC->SetCerenkov(idtmed[1000], kNbins, aPckov, aAbsCH4,    aQeAll, aIdxCH4);
 259   gMC->SetCerenkov(idtmed[1001], kNbins, aPckov, aAbsCH4,    aQeAll, aIdxCH4);
 260   gMC->SetCerenkov(idtmed[1002], kNbins, aPckov, aAbsSiO2,   aQeAll, aIdxSiO2);
 261   gMC->SetCerenkov(idtmed[1003], kNbins, aPckov, aAbsC6F14,  aQeAll, aIdxC6F14);
 262   gMC->SetCerenkov(idtmed[1004], kNbins, aPckov, aAbsCH4,    aQeAll, aIdxCH4);
 263   gMC->SetCerenkov(idtmed[1005], kNbins, aPckov, aAbsCsI,    aQeCsI, aIdxCH4);
 264   gMC->SetCerenkov(idtmed[1006], kNbins, aPckov, aAbsGrid,   aQeAll, aIdxGrid);
 265   gMC->SetCerenkov(idtmed[1007], kNbins, aPckov, aAbsOpSiO2, aQeAll, aIdxOpSiO2);
 266   gMC->SetCerenkov(idtmed[1008], kNbins, aPckov, aAbsCH4,    aQeAll, aIdxCH4);
 267   gMC->SetCerenkov(idtmed[1009], kNbins, aPckov, aAbsGrid,   aQeAll, aIdxGrid);
 268   gMC->SetCerenkov(idtmed[1010], kNbins, aPckov, aAbsOpSiO2, aQeAll, aIdxOpSiO2);
 269
 270 }//void AliRICH::CreateMaterials()
 271 //__________________________________________________________________________________________________
 272 Float_t AliRICH::Fresnel(Float_t ene,Float_t pdoti, Bool_t pola)const
 273 {
 274
 275     //ENE(EV), PDOTI=COS(INC.ANG.), PDOTR=COS(POL.PLANE ROT.ANG.)
 276
 277     Float_t en[36] = {5.0,5.1,5.2,5.3,5.4,5.5,5.6,5.7,5.8,5.9,6.0,6.1,6.2,
 278                       6.3,6.4,6.5,6.6,6.7,6.8,6.9,7.0,7.1,7.2,7.3,7.4,7.5,7.6,7.7,
 279                       7.8,7.9,8.0,8.1,8.2,8.3,8.4,8.5};
 280     Float_t csin[36] = {2.14,2.21,2.33,2.48,2.76,2.97,2.99,2.59,2.81,3.05,
 281                         2.86,2.53,2.55,2.66,2.79,2.96,3.18,3.05,2.84,2.81,2.38,2.11,
 282                         2.01,2.13,2.39,2.73,3.08,3.15,2.95,2.73,2.56,2.41,2.12,1.95,
 283                         1.72,1.53};
 284     Float_t csik[36] = {0.,0.,0.,0.,0.,0.196,0.408,0.208,0.118,0.49,0.784,0.543,
 285                         0.424,0.404,0.371,0.514,0.922,1.102,1.139,1.376,1.461,1.253,0.878,
 286                         0.69,0.612,0.649,0.824,1.347,1.571,1.678,1.763,1.857,1.824,1.824,
 287                         1.714,1.498};
 288     Float_t xe=ene;
 289     Int_t  j=Int_t(xe*10)-49;
 290     Float_t cn=csin[j]+((csin[j+1]-csin[j])/0.1)*(xe-en[j]);
 291     Float_t ck=csik[j]+((csik[j+1]-csik[j])/0.1)*(xe-en[j]);
 292
 293     //FORMULAE FROM HANDBOOK OF OPTICS, 33.23 OR
 294     //W.R. HUNTER, J.O.S.A. 54 (1964),15 , J.O.S.A. 55(1965),1197
 295
 296     Float_t sinin=TMath::Sqrt(1-pdoti*pdoti);
 297     Float_t tanin=sinin/pdoti;
 298
 299     Float_t c1=cn*cn-ck*ck-sinin*sinin;
 300     Float_t c2=4*cn*cn*ck*ck;
 301     Float_t aO=TMath::Sqrt(0.5*(TMath::Sqrt(c1*c1+c2)+c1));
 302     Float_t b2=0.5*(TMath::Sqrt(c1*c1+c2)-c1);
 303
 304     Float_t rs=((aO-pdoti)*(aO-pdoti)+b2)/((aO+pdoti)*(aO+pdoti)+b2);
 305     Float_t rp=rs*((aO-sinin*tanin)*(aO-sinin*tanin)+b2)/((aO+sinin*tanin)*(aO+sinin*tanin)+b2);
 306
 307
 308     //CORRECTION FACTOR FOR SURFACE ROUGHNESS
 309     //B.J. STAGG  APPLIED OPTICS, 30(1991),4113
 310
 311     Float_t sigraf=18.;
 312     Float_t lamb=1240/ene;
 313     Float_t fresn;
 314
 315     Float_t  rO=TMath::Exp(-(4*TMath::Pi()*pdoti*sigraf/lamb)*(4*TMath::Pi()*pdoti*sigraf/lamb));
 316
 317     if(pola)
 318     {
 319         Float_t pdotr=0.8;                                 //DEGREE OF POLARIZATION : 1->P , -1->S
 320         fresn=0.5*(rp*(1+pdotr)+rs*(1-pdotr));
 321     }
 322     else
 323         fresn=0.5*(rp+rs);
 324
 325     fresn = fresn*rO;
 326     return(fresn);
 327 }//Fresnel()
 328 //__________________________________________________________________________________________________
 329 Float_t AliRICH::AbsoCH4(Float_t x)const
 330 {
 331 //Evaluate the absorbtion lenght of CH4
 332   Float_t sch4[9] = {.12,.16,.23,.38,.86,2.8,7.9,28.,80.};              //MB X 10^22
 333   Float_t em[9] = {8.1,8.158,8.212,8.267,8.322,8.378,8.435,8.493,8.55};
 334   const Float_t kLoschmidt=2.686763e19;                                      // LOSCHMIDT NUMBER IN CM-3
 335   const Float_t kPressure=750.,kTemperature=283.;
 336   const Float_t kPn=kPressure/760.;
 337   const Float_t kTn=kTemperature/273.16;
 338   const Float_t kC0=-1.655279e-1;
 339   const Float_t kC1=6.307392e-2;
 340   const Float_t kC2=-8.011441e-3;
 341   const Float_t kC3=3.392126e-4;
 342
 343   Float_t crossSection=0;
 344   if (x<7.75)
 345     crossSection=.06e-22;
 346   else if(x>=7.75 && x<=8.1){                 //------ METHANE CROSS SECTION cm-2 ASTROPH. J. 214, L47 (1978)
 347         crossSection=(kC0+kC1*x+kC2*x*x+kC3*x*x*x)*1.e-18;
 348   }else if (x> 8.1){
 349     Int_t j=0;
 350     while (x<=em[j] || x>=em[j+1]){
 351       j++;
 352       Float_t a=(sch4[j+1]-sch4[j])/(em[j+1]-em[j]);
 353       crossSection=(sch4[j]+a*(x-em[j]))*1e-22;
 354     }
 355   }//if
 356
 357     Float_t density=kLoschmidt*kPn/kTn; //CH4 molecular density 1/cm-3
 358     return 1./(density*crossSection);
 359 }//AbsoCH4()
 360 //__________________________________________________________________________________________________
 361 void AliRICH::MakeBranch(Option_t* option)
 362 {
 363 //Create Tree branches for the RICH.
 364   if(GetDebug())Info("MakeBranch","Start with option= %s.",option);
 365
 366   const Int_t kBufferSize = 4000;
 367
 368   const char *cH = strstr(option,"H");
 369   const char *cD = strstr(option,"D");
 370   const char *cR = strstr(option,"R");
 371   const char *cS = strstr(option,"S");
 372
 373   if(cH&&TreeH()){//H
 374     CreateHits();      //branch will be created in AliDetector::MakeBranch
 375   }//H
 376   AliDetector::MakeBranch(option);//this is after cH because we need to guarantee that fHits array is created
 377
 378   if(cS&&fLoader->TreeS()){//S
 379     CreateSDigits();   MakeBranchInTree(fLoader->TreeS(),"RICH",&fSdigits,kBufferSize,0) ;
 380   }//S
 381
 382   if(cD&&fLoader->TreeD()){//D
 383     CreateDigits();
 384     for(Int_t i=0;i<kNCH;i++){
 385       MakeBranchInTree(fLoader->TreeD(),Form("%s%d",GetName(),i+1),&((*fDigitsNew)[i]),kBufferSize,0);
 386     }
 387   }//D
 388
 389   if(cR&&fLoader->TreeR()){//R
 390     CreateClusters();
 391     for(Int_t i=0;i<kNCH;i++)
 392       MakeBranchInTree(fLoader->TreeR(),Form("%sClusters%d",GetName(),i+1), &((*fClusters)[i]), kBufferSize, 0);
 393   }//R
 394   if(GetDebug())Info("MakeBranch","Stop.");
 395 }//void AliRICH::MakeBranch(Option_t* option)
 396 //__________________________________________________________________________________________________
 397 void AliRICH::SetTreeAddress()
 398 {
 399 //Set branch address for the Hits and Digits Tree.
 400   if(GetDebug())Info("SetTreeAddress","Start.");
 401
 402   TBranch *branch;
 403
 404   if(fLoader->TreeH()){//H
 405     if(GetDebug())Info("SetTreeAddress","tree H is requested.");
 406     CreateHits();//branch map will be in AliDetector::SetTreeAddress
 407   }//H
 408   AliDetector::SetTreeAddress();//this is after TreeH because we need to guarantee that fHits array is created
 409
 410   if(fLoader->TreeS()){//S
 411     if(GetDebug())Info("SetTreeAddress","tree S is requested.");
 412     branch=fLoader->TreeS()->GetBranch(GetName());        if(branch){CreateSDigits();   branch->SetAddress(&fSdigits);}
 413   }//S
 414
 415   if(fLoader->TreeD()){//D
 416     if(GetDebug())Info("SetTreeAddress","tree D is requested.");
 417     for(int i=0;i<kNCH;i++){
 418       branch=fLoader->TreeD()->GetBranch(Form("%s%d",GetName(),i+1));
 419       if(branch){CreateDigits(); branch->SetAddress(&((*fDigitsNew)[i]));}
 420     }
 421   }//D
 422
 423   if(fLoader->TreeR()){//R
 424     if(GetDebug())Info("SetTreeAddress","tree R is requested.");
 425     for(int i=0;i<kNCH;i++){
 426       branch=fLoader->TreeR()->GetBranch(Form("%sClusters%d" ,GetName(),i+1));
 427       if(branch){CreateClusters(); branch->SetAddress(&((*fClusters)[i]));}
 428     }
 429   }//R
 430   if(GetDebug())Info("SetTreeAddress","Stop.");
 431 }//void AliRICH::SetTreeAddress()
 432 //__________________________________________________________________________________________________
 433 void AliRICH::Print(Option_t *option)const
 434 {
 435 //Debug printout
 436   TObject::Print(option);
 437   P()->Dump();
 438   fChambers->Print(option);
 439 }//void AliRICH::Print(Option_t *option)const
 440 //__________________________________________________________________________________________________
 441 void AliRICH::CreateGeometry()
 442 {
 443 //Creates detailed geometry simulation (currently GEANT volumes tree)
 444   if(GetDebug())Info("CreateGeometry","Start.");
 445 //Opaque quartz thickness
 446   Float_t oquaThickness = .5;
 447 //CsI dimensions
 448   Float_t pcX=P()->PcSizeX();
 449   Float_t pcY=P()->PcSizeY();
 450
 451   Int_t *idtmed = fIdtmed->GetArray()-999;
 452
 453   Int_t i;
 454   Float_t zs;
 455   Int_t idrotm[1099];
 456   Float_t par[3];
 457
 458 //External aluminium box
 459   par[0]=68.8;par[1]=13;par[2]=70.86;  gMC->Gsvolu("RICH", "BOX ", idtmed[1009], par, 3);
 460 //Air
 461   par[0]=66.3;   par[1] = 13; par[2] = 68.35;      gMC->Gsvolu("SRIC", "BOX ", idtmed[1000], par, 3);
 462 //Air 2 (cutting the lower part of the box)
 463   par[0]=1.25;    par[1] = 3;    par[2] = 70.86;   gMC->Gsvolu("AIR2", "BOX ", idtmed[1000], par, 3);
 464 //Air 3 (cutting the lower part of the box)
 465   par[0]=66.3;    par[1] = 3;  par[2] = 1.2505;    gMC->Gsvolu("AIR3", "BOX ", idtmed[1000], par, 3);
 466 //Honeycomb
 467   par[0]=66.3;par[1]=0.188;  par[2] = 68.35;       gMC->Gsvolu("HONE", "BOX ", idtmed[1001], par, 3);
 468 //Aluminium sheet
 469   par[0]=66.3;par[1]=0.025;par[2]=68.35;           gMC->Gsvolu("ALUM", "BOX ", idtmed[1009], par, 3);
 470   //par[0] = 66.5; par[1] = .025; par[2] = 63.1;
 471 //Quartz
 472   par[0]=P()->QuartzWidth()/2;par[1]=P()->QuartzThickness()/2;par[2]=P()->QuartzLength()/2;
 473   gMC->Gsvolu("QUAR", "BOX ", idtmed[1002], par, 3);
 474 //Spacers (cylinders)
 475   par[0]=0.;par[1]=.5;par[2]=P()->FreonThickness()/2;  gMC->Gsvolu("SPAC", "TUBE", idtmed[1002], par, 3);
 476 //Feet (freon slabs supports)
 477   par[0] = .7;  par[1] = .3;  par[2] = 1.9;        gMC->Gsvolu("FOOT", "BOX", idtmed[1009], par, 3);
 478 //Opaque quartz
 479   par[0]=P()->QuartzWidth()/2;par[1]= .2;par[2]=P()->QuartzLength()/2;
 480   gMC->Gsvolu("OQUA", "BOX ", idtmed[1007], par, 3);
 481 //Frame of opaque quartz
 482   par[0]=P()->OuterFreonWidth()/2;par[1]=P()->FreonThickness()/2;par[2]=P()->OuterFreonLength()/2;
 483   gMC->Gsvolu("OQF1", "BOX ", idtmed[1007], par, 3);
 484   par[0]=P()->InnerFreonWidth()/2;par[1]=P()->FreonThickness()/2;par[2]=P()->InnerFreonLength()/2;
 485   gMC->Gsvolu("OQF2", "BOX ", idtmed[1007], par, 3);
 486 //Freon
 487   par[0]=P()->OuterFreonWidth()/2 - oquaThickness;
 488   par[1]=P()->FreonThickness()/2;
 489   par[2]=P()->OuterFreonLength()/2 - 2*oquaThickness;
 490   gMC->Gsvolu("FRE1", "BOX ", idtmed[1003], par, 3);
 491
 492   par[0]=P()->InnerFreonWidth()/2 - oquaThickness;
 493   par[1]=P()->FreonThickness()/2;
 494   par[2]=P()->InnerFreonLength()/2 - 2*oquaThickness;
 495   gMC->Gsvolu("FRE2", "BOX ", idtmed[1003], par, 3);
 496 //Methane
 497   par[0]=pcX/2;par[1]=P()->GapThickness()/2;par[2]=pcY/2;         gMC->Gsvolu("META","BOX ",idtmed[1004], par, 3);
 498 //Methane gap
 499   par[0]=pcX/2;par[1]=P()->ProximityGap()/2;par[2]=pcY/2;gMC->Gsvolu("GAP ","BOX ",(*fIdtmed)[kGAP],par,3);
 500 //CsI PC
 501   par[0]=pcX/2;par[1]=.25;par[2]=pcY/2;  gMC->Gsvolu("CSI ", "BOX ", (*fIdtmed)[kCSI], par, 3);
 502 //Anode grid
 503   par[0] = 0.;par[1] = .001;par[2] = 20.;  gMC->Gsvolu("GRID", "TUBE", idtmed[1006], par, 3);
 504
 505 //Wire supports
 506 //Bar of metal
 507   par[0]=pcX/2;par[1]=1.05;par[2]=1.05;  gMC->Gsvolu("WSMe", "BOX ", idtmed[1009], par, 3);
 508 //Ceramic pick up (base)
 509   par[0]=pcX/2;par[1]= .25;par[2]=1.05;  gMC->Gsvolu("WSG1", "BOX ", idtmed[1010], par, 3);
 510 //Ceramic pick up (head)
 511   par[0] = pcX/2;par[1] = .1;par[2] = .1;  gMC->Gsvolu("WSG2", "BOX ", idtmed[1010], par, 3);
 512
 513 //Aluminium supports for methane and CsI
 514 //Short bar
 515   par[0]=pcX/2;par[1]=P()->GapThickness()/2 + .25; par[2] = (68.35 - pcY/2)/2;
 516   gMC->Gsvolu("SMSH", "BOX", idtmed[1009], par, 3);
 517 //Long bar
 518   par[0]=(66.3 - pcX/2)/2;par[1]=P()->GapThickness()/2+.25;par[2]=pcY/2+68.35-pcY/2;
 519   gMC->Gsvolu("SMLG", "BOX", idtmed[1009], par, 3);
 520
 521 //Aluminium supports for freon
 522 //Short bar
 523   par[0] = P()->QuartzWidth()/2; par[1] = .3; par[2] = (68.35 - P()->QuartzLength()/2)/2;
 524   gMC->Gsvolu("SFSH", "BOX", idtmed[1009], par, 3);
 525 //Long bar
 526   par[0] = (66.3 - P()->QuartzWidth()/2)/2; par[1] = .3;
 527   par[2] = P()->QuartzLength()/2 + 68.35 - P()->QuartzLength()/2;
 528   gMC->Gsvolu("SFLG", "BOX", idtmed[1009], par, 3);
 529 //PCB backplane
 530   par[0] = pcX/2;par[1] = .25; par[2] = pcY/4 -.5025;  gMC->Gsvolu("PCB ", "BOX", idtmed[1011], par, 3);
 531
 532 //Backplane supports
 533 //Aluminium slab
 534   par[0] = 33.15;par[1] = 2;par[2] = 21.65;  gMC->Gsvolu("BACK", "BOX", idtmed[1009], par, 3);
 535 //Big hole
 536   par[0] = 9.05; par[1] = 2; par[2] = 4.4625;  gMC->Gsvolu("BKHL", "BOX", idtmed[1000], par, 3);
 537 //Small hole
 538   par[0] = 5.7;par[1] = 2;par[2] = 4.4625;  gMC->Gsvolu("BKHS", "BOX", idtmed[1000], par, 3);
 539 //Place holes inside backplane support
 540   gMC->Gspos("BKHS", 1, "BACK", .8 + 5.7,0., .6 + 4.4625, 0, "ONLY");
 541   gMC->Gspos("BKHS", 2, "BACK", -.8 - 5.7,0., .6 + 4.4625, 0, "ONLY");
 542   gMC->Gspos("BKHS", 3, "BACK", .8 + 5.7,0., -.6 - 4.4625, 0, "ONLY");
 543   gMC->Gspos("BKHS", 4, "BACK", -.8 - 5.7,0., -.6 - 4.4625, 0, "ONLY");
 544   gMC->Gspos("BKHS", 5, "BACK", .8 + 5.7,0., .6 + 8.925 + 1.2 + 4.4625, 0, "ONLY");
 545   gMC->Gspos("BKHS", 6, "BACK", -.8 - 5.7,0., .6 + 8.925 + 1.2 + 4.4625, 0, "ONLY");
 546   gMC->Gspos("BKHS", 7, "BACK", .8 + 5.7,0., -.6 - 8.925 - 1.2 - 4.4625, 0, "ONLY");
 547   gMC->Gspos("BKHS", 8, "BACK", -.8 - 5.7,0., -.6 - 8.925 - 1.2 - 4.4625, 0, "ONLY");
 548   gMC->Gspos("BKHL", 1, "BACK", .8 + 11.4 + 1.6 + 9.05, 0., .6 + 4.4625, 0, "ONLY");
 549   gMC->Gspos("BKHL", 2, "BACK", -.8 - 11.4 - 1.6 - 9.05, 0., .6 + 4.4625, 0, "ONLY");
 550   gMC->Gspos("BKHL", 3, "BACK", .8 + 11.4 + 1.6 + 9.05, 0., -.6 - 4.4625, 0, "ONLY");
 551   gMC->Gspos("BKHL", 4, "BACK", -.8 - 11.4 - 1.6 - 9.05, 0., -.6 - 4.4625, 0, "ONLY");
 552   gMC->Gspos("BKHL", 5, "BACK", .8 + 11.4+ 1.6 + 9.05, 0., .6 + 8.925 + 1.2 + 4.4625, 0, "ONLY");
 553   gMC->Gspos("BKHL", 6, "BACK", -.8 - 11.4 - 1.6 - 9.05, 0., .6 + 8.925 + 1.2 + 4.4625, 0, "ONLY");
 554   gMC->Gspos("BKHL", 7, "BACK", .8 + 11.4 + 1.6 + 9.05, 0., -.6 - 8.925 - 1.2 - 4.4625, 0, "ONLY");
 555   gMC->Gspos("BKHL", 8, "BACK", -.8 - 11.4 - 1.6 - 9.05, 0., -.6 - 8.925 - 1.2 - 4.4625, 0, "ONLY");
 556 //Place material inside RICH
 557   gMC->Gspos("SRIC", 1, "RICH", 0.,0., 0., 0, "ONLY");
 558   gMC->Gspos("AIR2", 1, "RICH", 66.3 + 1.2505, 1.276-P()->GapThickness()/2-P()->QuartzThickness()-P()->FreonThickness()- .4 - .6 - .05 - .376 -.5 - 3.35, 0., 0, "ONLY");
 559   gMC->Gspos("AIR2", 2, "RICH", -66.3 - 1.2505,1.276-P()->GapThickness()/2-P()->QuartzThickness()-P()->FreonThickness()- .4 - .6 - .05 - .376 -.5 - 3.35, 0., 0, "ONLY");
 560   gMC->Gspos("AIR3", 1, "RICH", 0., 1.276-P()->GapThickness()/2 - P()->QuartzThickness() - P()->FreonThickness()- .4 - .6 - .05 - .376 -.5 - 3.35, -68.35 - 1.25, 0, "ONLY");
 561   gMC->Gspos("AIR3", 2, "RICH", 0., 1.276 - P()->GapThickness()/2 - P()->QuartzThickness() - P()->FreonThickness()- .4 - .6 - .05 - .376 -.5 - 3.35,  68.35 + 1.25, 0, "ONLY");
 562   gMC->Gspos("ALUM", 1, "SRIC", 0., 1.276 - P()->GapThickness()/2 - P()->QuartzThickness() - P()->FreonThickness()- .4 - .6 - .05 - .376 -.025, 0., 0, "ONLY");
 563   gMC->Gspos("HONE", 1, "SRIC", 0., 1.276- P()->GapThickness()/2  - P()->QuartzThickness() - P()->FreonThickness()- .4 - .6 - .05 - .188, 0., 0, "ONLY");
 564   gMC->Gspos("ALUM", 2, "SRIC", 0., 1.276 - P()->GapThickness()/2 - P()->QuartzThickness() - P()->FreonThickness()- .4 - .6 - .025, 0., 0, "ONLY");
 565   gMC->Gspos("FOOT", 1, "SRIC", 64.95, 1.276 - P()->GapThickness()/2 - P()->QuartzThickness() - P()->FreonThickness()- .4 - .3, 36.9, 0, "ONLY");
 566   gMC->Gspos("FOOT", 2, "SRIC", 21.65, 1.276 - P()->GapThickness()/2 - P()->QuartzThickness() - P()->FreonThickness()- .4 - .3 , 36.9, 0, "ONLY");
 567   gMC->Gspos("FOOT", 3, "SRIC", -21.65, 1.276 - P()->GapThickness()/2 - P()->QuartzThickness() - P()->FreonThickness()- .4 - .3, 36.9, 0, "ONLY");
 568   gMC->Gspos("FOOT", 4, "SRIC", -64.95, 1.276 - P()->GapThickness()/2 - P()->QuartzThickness() - P()->FreonThickness()- .4 - .3, 36.9, 0, "ONLY");
 569   gMC->Gspos("FOOT", 5, "SRIC", 64.95, 1.276 - P()->GapThickness()/2 - P()->QuartzThickness() - P()->FreonThickness()- .4 - .3, -36.9, 0, "ONLY");
 570   gMC->Gspos("FOOT", 6, "SRIC", 21.65, 1.276 - P()->GapThickness()/2 - P()->QuartzThickness() - P()->FreonThickness()- .4 - .3, -36.9, 0, "ONLY");
 571   gMC->Gspos("FOOT", 7, "SRIC", -21.65, 1.276 - P()->GapThickness()/2 - P()->QuartzThickness() - P()->FreonThickness()- .4 - .3, -36.9, 0, "ONLY");
 572   gMC->Gspos("FOOT", 8, "SRIC", -64.95, 1.276 - P()->GapThickness()/2 - P()->QuartzThickness() - P()->FreonThickness()- .4 - .3, -36.9, 0, "ONLY");
 573   gMC->Gspos("OQUA", 1, "SRIC", 0., 1.276 - P()->GapThickness()/2 - P()->QuartzThickness() - P()->FreonThickness()- .2, 0., 0, "ONLY");
 574 // Methane supports
 575   gMC->Gspos("SMLG", 1, "SRIC", pcX/2 + (66.3 - pcX/2)/2, 1.276 + .25, 0., 0, "ONLY");
 576   gMC->Gspos("SMLG", 2, "SRIC", - pcX/2 - (66.3 - pcX/2)/2, 1.276 + .25, 0., 0, "ONLY");
 577   gMC->Gspos("SMSH", 1, "SRIC", 0., 1.276 + .25, pcY/2 + (68.35 - pcY/2)/2, 0, "ONLY");
 578   gMC->Gspos("SMSH", 2, "SRIC", 0., 1.276 + .25, - pcY/2 - (68.35 - pcY/2)/2, 0, "ONLY");
 579 //Freon supports
 580   Float_t suppY = 1.276 - P()->GapThickness()/2- P()->QuartzThickness() -P()->FreonThickness() - .2 + .3; //y position of freon supports
 581   gMC->Gspos("SFLG", 1, "SRIC", P()->QuartzWidth()/2 + (66.3 - P()->QuartzWidth()/2)/2, suppY, 0., 0, "ONLY");
 582   gMC->Gspos("SFLG", 2, "SRIC", - P()->QuartzWidth()/2 - (66.3 - P()->QuartzWidth()/2)/2, suppY, 0., 0, "ONLY");
 583   gMC->Gspos("SFSH", 1, "SRIC", 0., suppY, P()->QuartzLength()/2 + (68.35 - P()->QuartzLength()/2)/2, 0, "ONLY");
 584   gMC->Gspos("SFSH", 2, "SRIC", 0., suppY, - P()->QuartzLength()/2 - (68.35 - P()->QuartzLength()/2)/2, 0, "ONLY");
 585   AliMatrix(idrotm[1019], 0., 0., 90., 0., 90., 90.);
 586 //Place spacers
 587   Int_t nspacers = 30;
 588   for (i = 0; i < nspacers/3; i++) {
 589     zs = -11.6/2 + (TMath::Abs(nspacers/6) - i) * 12.2;
 590     gMC->Gspos("SPAC", i, "FRE1", 10.5, 0., zs, idrotm[1019], "ONLY");  //Original settings
 591   }
 592   for (i = nspacers/3; i < (nspacers*2)/3; i++) {
 593     zs = -11.6/2 + (nspacers/3 + TMath::Abs(nspacers/6) - i) * 12.2;
 594     gMC->Gspos("SPAC", i, "FRE1", 0, 0., zs, idrotm[1019], "ONLY");  //Original settings
 595   }
 596   for (i = (nspacers*2)/3; i < nspacers; ++i) {
 597     zs = -11.6/2 + ((nspacers*2)/3 + TMath::Abs(nspacers/6) - i) * 12.2;
 598     gMC->Gspos("SPAC", i, "FRE1", -10.5, 0., zs, idrotm[1019], "ONLY"); //Original settings
 599   }
 600   for (i = 0; i < nspacers/3; i++) {
 601     zs = -11.6/2 + (TMath::Abs(nspacers/6) - i) * 12.2;
 602     gMC->Gspos("SPAC", i, "FRE2", 10.5, 0., zs, idrotm[1019], "ONLY");  //Original settings
 603   }
 604   for (i = nspacers/3; i < (nspacers*2)/3; i++) {
 605     zs = -11.6/2 + (nspacers/3 + TMath::Abs(nspacers/6) - i) * 12.2;
 606     gMC->Gspos("SPAC", i, "FRE2", 0, 0., zs, idrotm[1019], "ONLY");  //Original settings
 607   }
 608   for (i = (nspacers*2)/3; i < nspacers; ++i) {
 609     zs = -11.6/2 + ((nspacers*2)/3 + TMath::Abs(nspacers/6) - i) * 12.2;
 610     gMC->Gspos("SPAC", i, "FRE2", -10.5, 0., zs, idrotm[1019], "ONLY"); //Original settings
 611   }
 612   gMC->Gspos("FRE1", 1, "OQF1", 0., 0., 0., 0, "ONLY");
 613   gMC->Gspos("FRE2", 1, "OQF2", 0., 0., 0., 0, "ONLY");
 614   gMC->Gspos("OQF1", 1, "SRIC", P()->OuterFreonWidth()/2 + P()->InnerFreonWidth()/2 + 2, 1.276 - P()->GapThickness()/2- P()->QuartzThickness() -P()->FreonThickness()/2, 0., 0, "ONLY"); //Original settings (31.3)
 615   gMC->Gspos("OQF2", 2, "SRIC", 0., 1.276 - P()->GapThickness()/2 - P()->QuartzThickness() - P()->FreonThickness()/2, 0., 0, "ONLY");          //Original settings
 616   gMC->Gspos("OQF1", 3, "SRIC", - (P()->OuterFreonWidth()/2 + P()->InnerFreonWidth()/2) - 2, 1.276 - P()->GapThickness()/2 - P()->QuartzThickness() - P()->FreonThickness()/2, 0., 0, "ONLY");       //Original settings (-31.3)
 617   gMC->Gspos("QUAR", 1, "SRIC", 0., 1.276 - P()->GapThickness()/2 - P()->QuartzThickness()/2, 0., 0, "ONLY");
 618   gMC->Gspos("GAP ", 1, "META", 0., P()->GapThickness()/2 - P()->ProximityGap()/2 - 0.0001, 0., 0, "ONLY");
 619   gMC->Gspos("META", 1, "SRIC", 0., 1.276, 0., 0, "ONLY");
 620   gMC->Gspos("CSI ", 1, "SRIC", 0., 1.276 + P()->GapThickness()/2 + .25, 0., 0, "ONLY");
 621 //Wire support placing
 622   gMC->Gspos("WSG2", 1, "GAP ", 0., P()->ProximityGap()/2 - .1, 0., 0, "ONLY");
 623   gMC->Gspos("WSG1", 1, "CSI ", 0., 0., 0., 0, "ONLY");
 624   gMC->Gspos("WSMe", 1, "SRIC ", 0., 1.276 + P()->GapThickness()/2 + .5 + 1.05, 0., 0, "ONLY");
 625 //Backplane placing
 626   gMC->Gspos("BACK", 1, "SRIC ", -33.15, 1.276 + P()->GapThickness()/2 + .5 + 2.1 + 2, 43.3, 0, "ONLY");
 627   gMC->Gspos("BACK", 2, "SRIC ", 33.15, 1.276 + P()->GapThickness()/2 + .5 + 2.1 + 2 , 43.3, 0, "ONLY");
 628   gMC->Gspos("BACK", 3, "SRIC ", -33.15, 1.276 + P()->GapThickness()/2 + .5 + 2.1 + 2, 0., 0, "ONLY");
 629   gMC->Gspos("BACK", 4, "SRIC ", 33.15, 1.276 + P()->GapThickness()/2 + .5 + 2.1 + 2, 0., 0, "ONLY");
 630   gMC->Gspos("BACK", 5, "SRIC ", 33.15, 1.276 + P()->GapThickness()/2 + .5 + 2.1 + 2, -43.3, 0, "ONLY");
 631   gMC->Gspos("BACK", 6, "SRIC ", -33.15, 1.276 + P()->GapThickness()/2 + .5 + 2.1 + 2, -43.3, 0, "ONLY");
 632 //PCB placing
 633   gMC->Gspos("PCB ", 1, "SRIC ", 0.,  1.276 + P()->GapThickness()/2 + .5 + 1.05, pcX/4 + .5025 + 2.5, 0, "ONLY");
 634   gMC->Gspos("PCB ", 2, "SRIC ", 0.,  1.276 + P()->GapThickness()/2 + .5 + 1.05, -pcX/4 - .5025 - 2.5, 0, "ONLY");
 635
 636 //place chambers into mother volume ALIC
 637   for(int i=1;i<=kNCH;i++){
 638     AliMatrix(idrotm[1000+i],C(i)->ThetaXd(),C(i)->PhiXd(),
 639                              C(i)->ThetaYd(),C(i)->PhiYd(),
 640                              C(i)->ThetaZd(),C(i)->PhiZd());
 641     gMC->Gspos("RICH",i,"ALIC",C(i)->X(),C(i)->Y(),C(i)->Z(),idrotm[1000+i], "ONLY");
 642   }
 643
 644   if(GetDebug())Info("CreateGeometry","Stop.");
 645 }//void AliRICH::CreateGeometry()
 646 //__________________________________________________________________________________________________
 647 void AliRICH::CreateChambers()
 648 {
 649 //create all RICH Chambers on each call. Previous chambers deleted
 650   if(fChambers) delete fChambers;
 651   if(GetDebug())Info("CreateChambers","Creating RICH chambers.");
 652   fChambers=new TObjArray(kNCH);
 653   fChambers->SetOwner();
 654   for(int i=0;i<kNCH;i++)  fChambers->AddAt(new AliRICHChamber(i+1,P()),i);
 655 }//void AliRICH::CreateChambers()
 656 //__________________________________________________________________________________________________
 657 void AliRICH::GenerateFeedbacks(Int_t iChamber,Float_t eloss)
 658 {
 659 // Generate FeedBack photons
 660 // eloss=0 means photon so only pulse height distribution is to be analysed. This one is done in AliRICHParam::TotQdc()
 661
 662   TLorentzVector x4;
 663   gMC->TrackPosition(x4);
 664   TVector2 x2=C(iChamber)->Glob2Loc(x4);
 665   Int_t sector=P()->Sector(x2);  if(sector==kBad) return; //hit in dead zone nothing to produce
 666   Int_t iTotQdc=P()->TotQdc(x2,eloss);
 667   Int_t iNphotons=gMC->GetRandom()->Poisson(P()->AlphaFeedback(sector)*iTotQdc);
 668   if(GetDebug())Info("GenerateFeedbacks","N photons=%i",iNphotons);
 669   Int_t j;
 670   Float_t cthf, phif, enfp = 0, sthf, e1[3], e2[3], e3[3], vmod, uswop,dir[3], phi,pol[3], mom[4];
 671 //Generate photons
 672   for(Int_t i=0;i<iNphotons;i++){//feedbacks loop
 673     Double_t ranf[2];
 674     gMC->GetRandom()->RndmArray(2,ranf);    //Sample direction
 675     cthf=ranf[0]*2-1.0;
 676     if(cthf<0) continue;
 677     sthf = TMath::Sqrt((1 - cthf) * (1 + cthf));
 678     phif = ranf[1] * 2 * TMath::Pi();
 679
 680     if(Double_t randomNumber=gMC->GetRandom()->Rndm()<=0.57)
 681       enfp = 7.5e-9;
 682     else if(randomNumber<=0.7)
 683       enfp = 6.4e-9;
 684     else
 685       enfp = 7.9e-9;
 686
 687
 688     dir[0] = sthf * TMath::Sin(phif);    dir[1] = cthf;    dir[2] = sthf * TMath::Cos(phif);
 689     gMC->Gdtom(dir, mom, 2);
 690     mom[0]*=enfp;    mom[1]*=enfp;    mom[2]*=enfp;
 691     mom[3] = TMath::Sqrt(mom[0]*mom[0]+mom[1]*mom[1]+mom[2]*mom[2]);
 692
 693     // Polarisation
 694     e1[0]=      0;    e1[1]=-dir[2];    e1[2]= dir[1];
 695     e2[0]=-dir[1];    e2[1]= dir[0];    e2[2]=      0;
 696     e3[0]= dir[1];    e3[1]=      0;    e3[2]=-dir[0];
 697
 698     vmod=0;
 699     for(j=0;j<3;j++) vmod+=e1[j]*e1[j];
 700     if (!vmod) for(j=0;j<3;j++) {
 701       uswop=e1[j];
 702       e1[j]=e3[j];
 703       e3[j]=uswop;
 704     }
 705     vmod=0;
 706     for(j=0;j<3;j++) vmod+=e2[j]*e2[j];
 707     if (!vmod) for(j=0;j<3;j++) {
 708       uswop=e2[j];
 709       e2[j]=e3[j];
 710       e3[j]=uswop;
 711     }
 712
 713     vmod=0;  for(j=0;j<3;j++) vmod+=e1[j]*e1[j];  vmod=TMath::Sqrt(1/vmod);  for(j=0;j<3;j++) e1[j]*=vmod;
 714     vmod=0;  for(j=0;j<3;j++) vmod+=e2[j]*e2[j];  vmod=TMath::Sqrt(1/vmod);  for(j=0;j<3;j++) e2[j]*=vmod;
 715
 716     phi = gMC->GetRandom()->Rndm()* 2 * TMath::Pi();
 717     for(j=0;j<3;j++) pol[j]=e1[j]*TMath::Sin(phi)+e2[j]*TMath::Cos(phi);
 718     gMC->Gdtom(pol, pol, 2);
 719     Int_t outputNtracksStored;
 720     gAlice->GetMCApp()->PushTrack(1,                 //do not transport
 721                      gAlice->GetMCApp()->GetCurrentTrackNumber(),//parent track
 722                      kFeedback,                      //PID
 723                      mom[0],mom[1],mom[2],mom[3],    //track momentum
 724                      x4.X(),x4.Y(),x4.Z(),x4.T(),    //track origin
 725                      pol[0],pol[1],pol[2],           //polarization
 726                      kPFeedBackPhoton,
 727                      outputNtracksStored,
 728                      1.0);
 729   }//feedbacks loop
 730 }//GenerateFeedbacks()
 731 //__________________________________________________________________________________________________
 732
 733 void AliRICH::Reconstruct() const
 734 {
 735 // reconstruct clusters
 736
 737   AliRICHClusterFinder clusterer(const_cast<AliRICH*>(this));
 738   clusterer.Exec();
 739 }
 740