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 <TArrayF.h>
  20 #include <TGeometry.h>
  21 #include <TBRIK.h>
  22 #include <TTUBE.h>
  23 #include <TFile.h>
  24 #include <TNode.h>
  25 #include <TObjArray.h>
  26 #include <TParticle.h>
  27 #include <AliStack.h>
  28 #include <AliMagF.h>
  29 #include <AliRun.h>
  30 #include <AliRunDigitizer.h>
  31 #include <AliMC.h>
  32 #include <TVirtualMC.h>
  33
  34 ClassImp(AliRICHhit)
  35 //__________________________________________________________________________________________________
  36 void AliRICHhit::Print(Option_t*)const
  37 {
  38   ::Info("hit","Ch=%1i, TID=%6i, eloss=%9.3f eV, in-out dist=%9.4f, OUT(%7.2f,%7.2f,%7.2f)"
  39       ,fChamber,fTrack,fEloss*1e9,Length(),fOutX3.X(),fOutX3.Y(),fOutX3.Z());
  40 }
  41 //__________________________________________________________________________________________________
  42 ClassImp(AliRICHdigit)
  43 //__________________________________________________________________________________________________
  44 void AliRICHdigit::Print(Option_t*)const
  45 {
  46   ::Info("digit","csxy=%6i, cfm=%9i, c=%2i, x=%3i, y=%3i, q=%8.3f, TID1=%5i, TID2=%5i, TID3=%5i",
  47                   Id(),fCombiPid,fChamber,fPadX,fPadY,fQdc,fTracks[0],fTracks[1],fTracks[2]);
  48 }
  49 //__________________________________________________________________________________________________
  50 ClassImp(AliRICHcluster)
  51 //__________________________________________________________________________________________________
  52 void AliRICHcluster::Print(Option_t*)const
  53 {
  54   ::Info("cluster","CombiPid=%10i, c=%2i, size=%6i, dim=%5i, x=%7.3f, y=%7.3f, Q=%6i, st=%i",
  55            fCombiPid,fChamber,fSize,fDimXY,fX,fY,fQdc,fStatus);
  56 }
  57 //__________________________________________________________________________________________________
  58 ClassImp(AliRICHreco)
  59 //__________________________________________________________________________________________________
  60 void AliRICHreco::Print(Option_t*)const
  61 {
  62   ::Info("reco","ThetaCherenkov=%9.6f, Nphotons=%4i, TID=%9i",fThetaCherenkov,fNphotons,fTid);
  63 }
  64 //__________________________________________________________________________________________________
  65 ClassImp(AliRICH)
  66 //__________________________________________________________________________________________________
  67 // RICH manager class
  68 //BEGIN_HTML
  69 /*
  70   <img src="gif/alirich.gif">
  71 */
  72 //END_HTML
  73 //__________________________________________________________________________________________________
  74 AliRICH::AliRICH()
  75         :AliDetector()
  76 {
  77 //Default ctor should not contain any new operators
  78   fpParam     =0;
  79   fChambers   =0;
  80 //AliDetector ctor deals with Hits and Digits
  81   fSdigits    =0; fNsdigits   =0;
  82   fDigitsNew  =0; for(int i=0;i<kNCH;i++) fNdigitsNew[i]  =0;
  83   fClusters   =0; for(int i=0;i<kNCH;i++) fNclusters[i]=0;
  84   fRecos      =0; fNrecos     =0;
  85   fCerenkovs  =0; fNcerenkovs =0;
  86   fSpecials   =0; fNspecials  =0;
  87   fCkovNumber=fFreonProd=0;
  88 }//AliRICH::AliRICH()
  89 //__________________________________________________________________________________________________
  90 AliRICH::AliRICH(const char *name, const char *title)
  91         :AliDetector(name,title)
  92 {
  93 //Named ctor
  94   if(GetDebug())Info("named ctor","Start.");
  95   fpParam     =   new AliRICHParam;
  96   fChambers = 0;  CreateChambers();
  97 //AliDetector ctor deals with Hits and Digits (reset them to 0, does not create them)
  98   fHits=       0;     CreateHits();          gAlice->GetMCApp()->AddHitList(fHits);
  99   fSdigits=    0;
 100   fDigitsNew=  0;
 101   fClusters=   0;
 102   fRecos      =0;
 103
 104   fCerenkovs=  0;     CreateCerenkovsOld();  gAlice->GetMCApp()->AddHitList(fCerenkovs);
 105   fSpecials=   0;     CreateSpecialsOld();
 106
 107   fCkovNumber=fFreonProd=0;
 108   if(GetDebug())Info("named ctor","Stop.");
 109 }//AliRICH::AliRICH(const char *name, const char *title)
 110 //__________________________________________________________________________________________________
 111 AliRICH::~AliRICH()
 112 {
 113 //dtor
 114   if(GetDebug()) Info("dtor","Start.");
 115
 116   if(fpParam)    delete fpParam;
 117   if(fChambers)  delete fChambers;
 118
 119   if(fHits)      delete fHits;
 120   if(fSdigits)   delete fSdigits;
 121   if(fDigits)    delete fDigits;
 122   if(fDigitsNew) {fDigitsNew->Delete();   delete fDigitsNew;}
 123   if(fClusters)  {fClusters->Delete();    delete fClusters;}
 124   if(fRecos)     delete fRecos;
 125   if(fCerenkovs) delete fCerenkovs;
 126   if(fSpecials)  delete fSpecials;
 127   if(GetDebug()) Info("dtor","Stop.");
 128 }//AliRICH::~AliRICH()
 129 //__________________________________________________________________________________________________
 130 void AliRICH::Hits2SDigits()
 131 {
 132 // Create a list of sdigits corresponding to list of hits. Every hit generates one or more sdigits.
 133 //
 134   if(GetDebug()) Info("Hit2SDigits","Start.");
 135   for(Int_t iEventN=0;iEventN<GetLoader()->GetRunLoader()->GetAliRun()->GetEventsPerRun();iEventN++){//events loop
 136     GetLoader()->GetRunLoader()->GetEvent(iEventN);
 137
 138     if(!GetLoader()->TreeH()) GetLoader()->LoadHits();    GetLoader()->GetRunLoader()->LoadHeader();
 139                                                           GetLoader()->GetRunLoader()->LoadKinematics();//from
 140     if(!GetLoader()->TreeS()) GetLoader()->MakeTree("S"); MakeBranch("S");//to
 141
 142     for(Int_t iPrimN=0;iPrimN<GetLoader()->TreeH()->GetEntries();iPrimN++){//prims loop
 143       GetLoader()->TreeH()->GetEntry(iPrimN);
 144       for(Int_t iHitN=0;iHitN<Hits()->GetEntries();iHitN++){//hits loop
 145         AliRICHhit *pHit=(AliRICHhit*)Hits()->At(iHitN);
 146         TVector2 x2 = Param()->ShiftToWirePos(C(pHit->C())->Glob2Loc(pHit->OutX3()));
 147         Int_t iTotQdc=Param()->TotQdc(x2,pHit->Eloss());
 148
 149         Int_t iPadXmin,iPadXmax,iPadYmin,iPadYmax;
 150         Param()->Loc2Area(x2,iPadXmin,iPadYmin,iPadXmax,iPadYmax);//determine affected pads
 151         if(GetDebug()) Info("Hits2SDigits","left-down=(%i,%i) right-up=(%i,%i)",iPadXmin,iPadYmin,iPadXmax,iPadYmax);
 152         for(Int_t iPadY=iPadYmin;iPadY<=iPadYmax;iPadY++)//affected pads loop
 153           for(Int_t iPadX=iPadXmin;iPadX<=iPadXmax;iPadX++){
 154             Double_t padQdc=iTotQdc*Param()->FracQdc(x2,iPadX,iPadY);
 155             if(padQdc>0.1) AddSDigit(pHit->C(),iPadX,iPadY,padQdc,
 156               GetLoader()->GetRunLoader()->Stack()->Particle(pHit->GetTrack())->GetPdgCode(),pHit->GetTrack());
 157           }//affected pads loop
 158       }//hits loop
 159     }//prims loop
 160     GetLoader()->TreeS()->Fill();
 161     GetLoader()->WriteSDigits("OVERWRITE");
 162   }//events loop
 163   GetLoader()->UnloadHits(); GetLoader()->GetRunLoader()->UnloadHeader(); GetLoader()->GetRunLoader()->UnloadKinematics();
 164   GetLoader()->UnloadSDigits();
 165   if(GetDebug()) Info("Hit2SDigits","Stop.");
 166 }//Hits2SDigits()
 167 //__________________________________________________________________________________________________
 168 void AliRICH::SDigits2Digits()
 169 {
 170 //Generate digits from sdigits.
 171   if(GetDebug()) Info("SDigits2Digits","Start.");
 172   if(GetDebug()) Info("SDigits2Digits","Stop.");
 173 }//SDigits2Digits()
 174 //__________________________________________________________________________________________________
 175 void AliRICH::BuildGeometry()
 176 {
 177 //Builds a TNode geometry for event display
 178   if(GetDebug())Info("BuildGeometry","Start.");
 179
 180   TNode *node, *subnode, *top;
 181   top=gAlice->GetGeometry()->GetNode("alice");
 182
 183   new TBRIK("S_RICH","S_RICH","void",71.09999,11.5,73.15);
 184
 185   Float_t wid=Param()->SectorSizeX();
 186   Float_t len=Param()->SectorSizeY();
 187   new TBRIK("PHOTO","PHOTO","void",wid/2,0.1,len/2);
 188
 189   for(int i=1;i<=kNCH;i++){
 190     top->cd();
 191     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());
 192     node->SetLineColor(kRed);
 193     node->cd();
 194     subnode = new TNode("PHOTO1","PHOTO1","PHOTO",wid+Param()->DeadZone(),5,len/2+Param()->DeadZone()/2,"");
 195     subnode->SetLineColor(kGreen);
 196     fNodes->Add(subnode);
 197     subnode = new TNode("PHOTO1","PHOTO1","PHOTO",0,5,len/2+Param()->DeadZone()/2,"");
 198     subnode->SetLineColor(kGreen);
 199     fNodes->Add(subnode);
 200     subnode = new TNode("PHOTO1","PHOTO1","PHOTO",-wid-Param()->DeadZone(),5,len/2+Param()->DeadZone()/2,"");
 201     subnode->SetLineColor(kGreen);
 202     fNodes->Add(subnode);
 203     subnode = new TNode("PHOTO1","PHOTO1","PHOTO",wid+Param()->DeadZone(),5,-len/2-Param()->DeadZone()/2,"");
 204     subnode->SetLineColor(kGreen);
 205     fNodes->Add(subnode);
 206     subnode = new TNode("PHOTO1","PHOTO1","PHOTO",0,5,-len/2 -Param()->DeadZone()/2,"");
 207     subnode->SetLineColor(kGreen);
 208     fNodes->Add(subnode);
 209     subnode = new TNode("PHOTO1","PHOTO1","PHOTO",-wid-Param()->DeadZone(),5,-len/2 - Param()->DeadZone()/2,"");
 210     subnode->SetLineColor(kGreen);
 211     fNodes->Add(subnode);
 212     fNodes->Add(node);
 213   }
 214   if(GetDebug())Info("BuildGeometry","Stop.");
 215 }//void AliRICH::BuildGeometry()
 216
 217 //______________________________________________________________________________
 218 void AliRICH::CreateMaterials()
 219 {
 220     //
 221     // *** DEFINITION OF AVAILABLE RICH MATERIALS ***
 222
 223 #include "Opticals.h"
 224
 225   Float_t a=0,z=0,den=0,radl=0,absl=0;
 226   Float_t tmaxfd=-10.0, deemax=-0.2, stemax=-0.1,epsil=0.001, stmin=-0.001;
 227   Int_t   isxfld = gAlice->Field()->Integ();
 228   Float_t sxmgmx = gAlice->Field()->Max();
 229
 230   AliMaterial( 1, "Air     $",a=14.61,z=7.3, den=0.001205,radl=30420.0,absl=67500);//(Air)
 231   AliMedium(1, "DEFAULT MEDIUM AIR$", 1, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 232
 233   AliMaterial( 6, "HON",      a=12.01,z=6.0, den=0.1,     radl=18.8,   absl=0);    //(C)-equivalent radl
 234   AliMedium(2, "HONEYCOMB$", 6, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 235
 236   AliMaterial(16, "CSI",      a=12.01,z=6.0, den=0.1,     radl=18.8,   absl=0);    //CsI-radl equivalent
 237   AliMedium(kCSI, "CSI$", 16, 1, isxfld, sxmgmx,tmaxfd, stemax, deemax, epsil, stmin);
 238
 239   AliMaterial(11, "GRI",      a=63.54,z=29.0,den=8.96,    radl=1.43,   absl=0);    //anode grid (Cu)
 240   AliMedium(7, "GRID$", 11, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 241
 242   AliMaterial(50, "ALUM",     a=26.98,z=13.0,den=2.7,     radl=8.9,    absl=0);    //aluminium sheet (Al)
 243   AliMedium(10, "ALUMINUM$", 50, 1, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 244
 245   AliMaterial(31, "COPPER$",  a=63.54,z=29.0,den=8.96,    radl=1.4,    absl=0);    //(Cu)
 246   AliMedium(12, "PCB_COPPER", 31, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 247
 248   Float_t  aQuartz[2]={28.09,16.0};  Float_t  zQuartz[2]={14.00, 8.0};  Float_t  wmatQuartz[2]={1,2};
 249   AliMixture (20, "QUA",aQuartz,zQuartz,den=2.64,-2, wmatQuartz);//Quarz (SiO2) - trasnparent
 250   AliMedium(3, "QUARTZ$", 20, 1, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 251
 252   AliMixture (21, "QUAO",aQuartz, zQuartz, den=2.64, -2, wmatQuartz);//Quarz (SiO2) - opaque
 253   AliMedium(8, "QUARTZO$", 21, 1, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 254
 255   Float_t  aFreon[2]={12,19};  Float_t  zFreon[2]={6,9};  Float_t wmatFreon[2]={6,14};
 256   AliMixture (30, "FRE",aFreon,zFreon,den=1.7,-2,wmatFreon);//Freon (C6F14)
 257   AliMedium(4, "FREON$", 30, 1, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 258
 259   Float_t aMethane[2]={12.01,1}; Float_t zMethane[2]={6,1}; Float_t wmatMethane[2]={1,4};
 260   AliMixture (40, "MET", aMethane, zMethane, den=7.17e-4,-2, wmatMethane);//methane (CH4)
 261   AliMedium(5, "METHANE$", 40, 1, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 262
 263   AliMixture (41, "METG", aMethane, zMethane, den=7.17e-4, -2, wmatMethane);
 264   AliMedium(kGAP, "GAP$", 41, 1, isxfld, sxmgmx,tmaxfd, 0.1, -deemax, epsil, -stmin);
 265
 266   Float_t aGlass[5]={12.01, 28.09, 16.,   10.8,  23.};
 267   Float_t zGlass[5]={ 6.,   14.,    8.,    5.,   11.};
 268   Float_t wGlass[5]={ 0.5,  0.105, 0.355, 0.03,  0.01};
 269   AliMixture (32, "GLASS",aGlass, zGlass, den=1.74, 5, wGlass);//Glass 50%C+10.5%Si+35.5%O+3% + 1%
 270   AliMedium(11, "GLASS", 32, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 271
 272   Int_t *idtmed = fIdtmed->GetArray()-999;
 273   gMC->SetCerenkov(idtmed[1000], kNbins, aPckov, aAbsCH4,    aQeAll, aIdxCH4);
 274   gMC->SetCerenkov(idtmed[1001], kNbins, aPckov, aAbsCH4,    aQeAll, aIdxCH4);
 275   gMC->SetCerenkov(idtmed[1002], kNbins, aPckov, aAbsSiO2,   aQeAll, aIdxSiO2);
 276   gMC->SetCerenkov(idtmed[1003], kNbins, aPckov, aAbsC6F14,  aQeAll, aIdxC6F14);
 277   gMC->SetCerenkov(idtmed[1004], kNbins, aPckov, aAbsCH4,    aQeAll, aIdxCH4);
 278   gMC->SetCerenkov(idtmed[1005], kNbins, aPckov, aAbsCsI,    aQeCsI, aIdxCH4);
 279   gMC->SetCerenkov(idtmed[1006], kNbins, aPckov, aAbsGrid,   aQeAll, aIdxGrid);
 280   gMC->SetCerenkov(idtmed[1007], kNbins, aPckov, aAbsOpSiO2, aQeAll, aIdxOpSiO2);
 281   gMC->SetCerenkov(idtmed[1008], kNbins, aPckov, aAbsCH4,    aQeAll, aIdxCH4);
 282   gMC->SetCerenkov(idtmed[1009], kNbins, aPckov, aAbsGrid,   aQeAll, aIdxGrid);
 283   gMC->SetCerenkov(idtmed[1010], kNbins, aPckov, aAbsOpSiO2, aQeAll, aIdxOpSiO2);
 284
 285 }//void AliRICH::CreateMaterials()
 286 //__________________________________________________________________________________________________
 287 Float_t AliRICH::Fresnel(Float_t ene,Float_t pdoti, Bool_t pola)const
 288 {
 289
 290     //ENE(EV), PDOTI=COS(INC.ANG.), PDOTR=COS(POL.PLANE ROT.ANG.)
 291
 292     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,
 293                       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,
 294                       7.8,7.9,8.0,8.1,8.2,8.3,8.4,8.5};
 295     Float_t csin[36] = {2.14,2.21,2.33,2.48,2.76,2.97,2.99,2.59,2.81,3.05,
 296                         2.86,2.53,2.55,2.66,2.79,2.96,3.18,3.05,2.84,2.81,2.38,2.11,
 297                         2.01,2.13,2.39,2.73,3.08,3.15,2.95,2.73,2.56,2.41,2.12,1.95,
 298                         1.72,1.53};
 299     Float_t csik[36] = {0.,0.,0.,0.,0.,0.196,0.408,0.208,0.118,0.49,0.784,0.543,
 300                         0.424,0.404,0.371,0.514,0.922,1.102,1.139,1.376,1.461,1.253,0.878,
 301                         0.69,0.612,0.649,0.824,1.347,1.571,1.678,1.763,1.857,1.824,1.824,
 302                         1.714,1.498};
 303     Float_t xe=ene;
 304     Int_t  j=Int_t(xe*10)-49;
 305     Float_t cn=csin[j]+((csin[j+1]-csin[j])/0.1)*(xe-en[j]);
 306     Float_t ck=csik[j]+((csik[j+1]-csik[j])/0.1)*(xe-en[j]);
 307
 308     //FORMULAE FROM HANDBOOK OF OPTICS, 33.23 OR
 309     //W.R. HUNTER, J.O.S.A. 54 (1964),15 , J.O.S.A. 55(1965),1197
 310
 311     Float_t sinin=TMath::Sqrt(1-pdoti*pdoti);
 312     Float_t tanin=sinin/pdoti;
 313
 314     Float_t c1=cn*cn-ck*ck-sinin*sinin;
 315     Float_t c2=4*cn*cn*ck*ck;
 316     Float_t aO=TMath::Sqrt(0.5*(TMath::Sqrt(c1*c1+c2)+c1));
 317     Float_t b2=0.5*(TMath::Sqrt(c1*c1+c2)-c1);
 318
 319     Float_t rs=((aO-pdoti)*(aO-pdoti)+b2)/((aO+pdoti)*(aO+pdoti)+b2);
 320     Float_t rp=rs*((aO-sinin*tanin)*(aO-sinin*tanin)+b2)/((aO+sinin*tanin)*(aO+sinin*tanin)+b2);
 321
 322
 323     //CORRECTION FACTOR FOR SURFACE ROUGHNESS
 324     //B.J. STAGG  APPLIED OPTICS, 30(1991),4113
 325
 326     Float_t sigraf=18.;
 327     Float_t lamb=1240/ene;
 328     Float_t fresn;
 329
 330     Float_t  rO=TMath::Exp(-(4*TMath::Pi()*pdoti*sigraf/lamb)*(4*TMath::Pi()*pdoti*sigraf/lamb));
 331
 332     if(pola)
 333     {
 334         Float_t pdotr=0.8;                                 //DEGREE OF POLARIZATION : 1->P , -1->S
 335         fresn=0.5*(rp*(1+pdotr)+rs*(1-pdotr));
 336     }
 337     else
 338         fresn=0.5*(rp+rs);
 339
 340     fresn = fresn*rO;
 341     return(fresn);
 342 }//Fresnel()
 343 //__________________________________________________________________________________________________
 344 Float_t AliRICH::AbsoCH4(Float_t x)const
 345 {
 346 //Evaluate the absorbtion lenght of CH4
 347   Float_t sch4[9] = {.12,.16,.23,.38,.86,2.8,7.9,28.,80.};              //MB X 10^22
 348   Float_t em[9] = {8.1,8.158,8.212,8.267,8.322,8.378,8.435,8.493,8.55};
 349   const Float_t kLoschmidt=2.686763e19;                                      // LOSCHMIDT NUMBER IN CM-3
 350   const Float_t kPressure=750.,kTemperature=283.;
 351   const Float_t kPn=kPressure/760.;
 352   const Float_t kTn=kTemperature/273.16;
 353   const Float_t kC0=-1.655279e-1;
 354   const Float_t kC1=6.307392e-2;
 355   const Float_t kC2=-8.011441e-3;
 356   const Float_t kC3=3.392126e-4;
 357
 358   Float_t crossSection=0;
 359   if (x<7.75)
 360     crossSection=.06e-22;
 361   else if(x>=7.75 && x<=8.1){                 //------ METHANE CROSS SECTION cm-2 ASTROPH. J. 214, L47 (1978)
 362         crossSection=(kC0+kC1*x+kC2*x*x+kC3*x*x*x)*1.e-18;
 363   }else if (x> 8.1){
 364     Int_t j=0;
 365     while (x<=em[j] || x>=em[j+1]){
 366       j++;
 367       Float_t a=(sch4[j+1]-sch4[j])/(em[j+1]-em[j]);
 368       crossSection=(sch4[j]+a*(x-em[j]))*1e-22;
 369     }
 370   }//if
 371
 372     Float_t density=kLoschmidt*kPn/kTn; //CH4 molecular density 1/cm-3
 373     return 1./(density*crossSection);
 374 }//AbsoCH4()
 375 //__________________________________________________________________________________________________
 376 void AliRICH::MakeBranch(Option_t* option)
 377 {
 378 //Create Tree branches for the RICH.
 379   if(GetDebug())Info("MakeBranch","Start with option= %s.",option);
 380
 381   const Int_t kBufferSize = 4000;
 382
 383   const char *cH = strstr(option,"H");
 384   const char *cD = strstr(option,"D");
 385   const char *cR = strstr(option,"R");
 386   const char *cS = strstr(option,"S");
 387
 388   if(cH&&TreeH()){//H
 389     CreateHits();      //branch will be created in AliDetector::MakeBranch
 390     CreateCerenkovsOld(); MakeBranchInTree(TreeH(),"RICHCerenkov", &fCerenkovs, kBufferSize,0);
 391     CreateSpecialsOld();  MakeBranchInTree(TreeH(),"RICHSpecials", &fSpecials,kBufferSize,0);
 392   }//H
 393   AliDetector::MakeBranch(option);//this is after cH because we need to guarantee that fHits array is created
 394
 395   if(cS&&fLoader->TreeS()){//S
 396     CreateSDigits();   MakeBranchInTree(fLoader->TreeS(),"RICH",&fSdigits,kBufferSize,0) ;
 397   }//S
 398
 399   if(cD&&fLoader->TreeD()){//D
 400     CreateDigits();
 401     for(Int_t i=0;i<kNCH;i++){
 402       MakeBranchInTree(fLoader->TreeD(),Form("%s%d",GetName(),i+1),&((*fDigitsNew)[i]),kBufferSize,0);
 403     }
 404   }//D
 405
 406   if(cR&&fLoader->TreeR()){//R
 407     CreateClusters();
 408     for(Int_t i=0;i<kNCH;i++)
 409       MakeBranchInTree(fLoader->TreeR(),Form("%sClusters%d",GetName(),i+1), &((*fClusters)[i]), kBufferSize, 0);
 410   }//R
 411   if(GetDebug())Info("MakeBranch","Stop.");
 412 }//void AliRICH::MakeBranch(Option_t* option)
 413 //__________________________________________________________________________________________________
 414 void AliRICH::SetTreeAddress()
 415 {
 416 //Set branch address for the Hits and Digits Tree.
 417   if(GetDebug())Info("SetTreeAddress","Start.");
 418
 419   TBranch *branch;
 420
 421   if(fLoader->TreeH()){//H
 422     if(GetDebug())Info("SetTreeAddress","tree H is requested.");
 423     CreateHits();//branch map will be in AliDetector::SetTreeAddress
 424     branch=fLoader->TreeH()->GetBranch("RICHCerenkov");   if(branch){CreateCerenkovsOld(); branch->SetAddress(&fCerenkovs);}
 425     branch=fLoader->TreeH()->GetBranch("RICHSpecials");   if(branch){CreateSpecialsOld();  branch->SetAddress(&fSpecials);}
 426   }//H
 427   AliDetector::SetTreeAddress();//this is after TreeH because we need to guarantee that fHits array is created
 428
 429   if(fLoader->TreeS()){//S
 430     if(GetDebug())Info("SetTreeAddress","tree S is requested.");
 431     branch=fLoader->TreeS()->GetBranch(GetName());        if(branch){CreateSDigits();   branch->SetAddress(&fSdigits);}
 432   }//S
 433
 434   if(fLoader->TreeD()){//D
 435     if(GetDebug())Info("SetTreeAddress","tree D is requested.");
 436     for(int i=0;i<kNCH;i++){
 437       branch=fLoader->TreeD()->GetBranch(Form("%s%d",GetName(),i+1));
 438       if(branch){CreateDigits(); branch->SetAddress(&((*fDigitsNew)[i]));}
 439     }
 440   }//D
 441
 442   if(fLoader->TreeR()){//R
 443     if(GetDebug())Info("SetTreeAddress","tree R is requested.");
 444     for(int i=0;i<kNCH;i++){
 445       branch=fLoader->TreeR()->GetBranch(Form("%sClusters%d" ,GetName(),i+1));
 446       if(branch){CreateClusters(); branch->SetAddress(&((*fClusters)[i]));}
 447     }
 448   }//R
 449   if(GetDebug())Info("SetTreeAddress","Stop.");
 450 }//void AliRICH::SetTreeAddress()
 451 //__________________________________________________________________________________________________
 452 void AliRICH::Print(Option_t *option)const
 453 {
 454 //Debug printout
 455   TObject::Print(option);
 456   Param()->Dump();
 457   fChambers->Print(option);
 458 }//void AliRICH::Print(Option_t *option)const
 459 //__________________________________________________________________________________________________
 460 void AliRICH::CreateGeometry()
 461 {
 462 //Creates detailed geometry simulation (currently GEANT volumes tree)
 463   if(GetDebug())Info("CreateGeometry","Start.");
 464 //Opaque quartz thickness
 465   Float_t oquaThickness = .5;
 466 //CsI dimensions
 467   Float_t pcX=Param()->PcSizeX();
 468   Float_t pcY=Param()->PcSizeY();
 469
 470   Int_t *idtmed = fIdtmed->GetArray()-999;
 471
 472   Int_t i;
 473   Float_t zs;
 474   Int_t idrotm[1099];
 475   Float_t par[3];
 476
 477 //External aluminium box
 478   par[0]=68.8;par[1]=13;par[2]=70.86;  gMC->Gsvolu("RICH", "BOX ", idtmed[1009], par, 3);
 479 //Air
 480   par[0]=66.3;   par[1] = 13; par[2] = 68.35;      gMC->Gsvolu("SRIC", "BOX ", idtmed[1000], par, 3);
 481 //Air 2 (cutting the lower part of the box)
 482   par[0]=1.25;    par[1] = 3;    par[2] = 70.86;   gMC->Gsvolu("AIR2", "BOX ", idtmed[1000], par, 3);
 483 //Air 3 (cutting the lower part of the box)
 484   par[0]=66.3;    par[1] = 3;  par[2] = 1.2505;    gMC->Gsvolu("AIR3", "BOX ", idtmed[1000], par, 3);
 485 //Honeycomb
 486   par[0]=66.3;par[1]=0.188;  par[2] = 68.35;       gMC->Gsvolu("HONE", "BOX ", idtmed[1001], par, 3);
 487 //Aluminium sheet
 488   par[0]=66.3;par[1]=0.025;par[2]=68.35;           gMC->Gsvolu("ALUM", "BOX ", idtmed[1009], par, 3);
 489   //par[0] = 66.5; par[1] = .025; par[2] = 63.1;
 490 //Quartz
 491   par[0]=Param()->QuartzWidth()/2;par[1]=Param()->QuartzThickness()/2;par[2]=Param()->QuartzLength()/2;
 492   gMC->Gsvolu("QUAR", "BOX ", idtmed[1002], par, 3);
 493 //Spacers (cylinders)
 494   par[0]=0.;par[1]=.5;par[2]=Param()->FreonThickness()/2;  gMC->Gsvolu("SPAC", "TUBE", idtmed[1002], par, 3);
 495 //Feet (freon slabs supports)
 496   par[0] = .7;  par[1] = .3;  par[2] = 1.9;        gMC->Gsvolu("FOOT", "BOX", idtmed[1009], par, 3);
 497 //Opaque quartz
 498   par[0]=Param()->QuartzWidth()/2;par[1]= .2;par[2]=Param()->QuartzLength()/2;
 499   gMC->Gsvolu("OQUA", "BOX ", idtmed[1007], par, 3);
 500 //Frame of opaque quartz
 501   par[0]=Param()->OuterFreonWidth()/2;par[1]=Param()->FreonThickness()/2;par[2]=Param()->OuterFreonLength()/2;
 502   gMC->Gsvolu("OQF1", "BOX ", idtmed[1007], par, 3);
 503   par[0]=Param()->InnerFreonWidth()/2;par[1]=Param()->FreonThickness()/2;par[2]=Param()->InnerFreonLength()/2;
 504   gMC->Gsvolu("OQF2", "BOX ", idtmed[1007], par, 3);
 505 //Freon
 506   par[0]=Param()->OuterFreonWidth()/2 - oquaThickness;
 507   par[1]=Param()->FreonThickness()/2;
 508   par[2]=Param()->OuterFreonLength()/2 - 2*oquaThickness;
 509   gMC->Gsvolu("FRE1", "BOX ", idtmed[1003], par, 3);
 510
 511   par[0]=Param()->InnerFreonWidth()/2 - oquaThickness;
 512   par[1]=Param()->FreonThickness()/2;
 513   par[2]=Param()->InnerFreonLength()/2 - 2*oquaThickness;
 514   gMC->Gsvolu("FRE2", "BOX ", idtmed[1003], par, 3);
 515 //Methane
 516   par[0]=pcX/2;par[1]=Param()->GapThickness()/2;par[2]=pcY/2;         gMC->Gsvolu("META","BOX ",idtmed[1004], par, 3);
 517 //Methane gap
 518   par[0]=pcX/2;par[1]=Param()->ProximityGap()/2;par[2]=pcY/2;gMC->Gsvolu("GAP ","BOX ",(*fIdtmed)[kGAP],par,3);
 519 //CsI PC
 520   par[0]=pcX/2;par[1]=.25;par[2]=pcY/2;  gMC->Gsvolu("CSI ", "BOX ", (*fIdtmed)[kCSI], par, 3);
 521 //Anode grid
 522   par[0] = 0.;par[1] = .001;par[2] = 20.;  gMC->Gsvolu("GRID", "TUBE", idtmed[1006], par, 3);
 523
 524 //Wire supports
 525 //Bar of metal
 526   par[0]=pcX/2;par[1]=1.05;par[2]=1.05;  gMC->Gsvolu("WSMe", "BOX ", idtmed[1009], par, 3);
 527 //Ceramic pick up (base)
 528   par[0]=pcX/2;par[1]= .25;par[2]=1.05;  gMC->Gsvolu("WSG1", "BOX ", idtmed[1010], par, 3);
 529 //Ceramic pick up (head)
 530   par[0] = pcX/2;par[1] = .1;par[2] = .1;  gMC->Gsvolu("WSG2", "BOX ", idtmed[1010], par, 3);
 531
 532 //Aluminium supports for methane and CsI
 533 //Short bar
 534   par[0]=pcX/2;par[1]=Param()->GapThickness()/2 + .25; par[2] = (68.35 - pcY/2)/2;
 535   gMC->Gsvolu("SMSH", "BOX", idtmed[1009], par, 3);
 536 //Long bar
 537   par[0]=(66.3 - pcX/2)/2;par[1]=Param()->GapThickness()/2+.25;par[2]=pcY/2+68.35-pcY/2;
 538   gMC->Gsvolu("SMLG", "BOX", idtmed[1009], par, 3);
 539
 540 //Aluminium supports for freon
 541 //Short bar
 542   par[0] = Param()->QuartzWidth()/2; par[1] = .3; par[2] = (68.35 - Param()->QuartzLength()/2)/2;
 543   gMC->Gsvolu("SFSH", "BOX", idtmed[1009], par, 3);
 544 //Long bar
 545   par[0] = (66.3 - Param()->QuartzWidth()/2)/2; par[1] = .3;
 546   par[2] = Param()->QuartzLength()/2 + 68.35 - Param()->QuartzLength()/2;
 547   gMC->Gsvolu("SFLG", "BOX", idtmed[1009], par, 3);
 548 //PCB backplane
 549   par[0] = pcX/2;par[1] = .25; par[2] = pcY/4 -.5025;  gMC->Gsvolu("PCB ", "BOX", idtmed[1011], par, 3);
 550
 551 //Backplane supports
 552 //Aluminium slab
 553   par[0] = 33.15;par[1] = 2;par[2] = 21.65;  gMC->Gsvolu("BACK", "BOX", idtmed[1009], par, 3);
 554 //Big hole
 555   par[0] = 9.05; par[1] = 2; par[2] = 4.4625;  gMC->Gsvolu("BKHL", "BOX", idtmed[1000], par, 3);
 556 //Small hole
 557   par[0] = 5.7;par[1] = 2;par[2] = 4.4625;  gMC->Gsvolu("BKHS", "BOX", idtmed[1000], par, 3);
 558 //Place holes inside backplane support
 559   gMC->Gspos("BKHS", 1, "BACK", .8 + 5.7,0., .6 + 4.4625, 0, "ONLY");
 560   gMC->Gspos("BKHS", 2, "BACK", -.8 - 5.7,0., .6 + 4.4625, 0, "ONLY");
 561   gMC->Gspos("BKHS", 3, "BACK", .8 + 5.7,0., -.6 - 4.4625, 0, "ONLY");
 562   gMC->Gspos("BKHS", 4, "BACK", -.8 - 5.7,0., -.6 - 4.4625, 0, "ONLY");
 563   gMC->Gspos("BKHS", 5, "BACK", .8 + 5.7,0., .6 + 8.925 + 1.2 + 4.4625, 0, "ONLY");
 564   gMC->Gspos("BKHS", 6, "BACK", -.8 - 5.7,0., .6 + 8.925 + 1.2 + 4.4625, 0, "ONLY");
 565   gMC->Gspos("BKHS", 7, "BACK", .8 + 5.7,0., -.6 - 8.925 - 1.2 - 4.4625, 0, "ONLY");
 566   gMC->Gspos("BKHS", 8, "BACK", -.8 - 5.7,0., -.6 - 8.925 - 1.2 - 4.4625, 0, "ONLY");
 567   gMC->Gspos("BKHL", 1, "BACK", .8 + 11.4 + 1.6 + 9.05, 0., .6 + 4.4625, 0, "ONLY");
 568   gMC->Gspos("BKHL", 2, "BACK", -.8 - 11.4 - 1.6 - 9.05, 0., .6 + 4.4625, 0, "ONLY");
 569   gMC->Gspos("BKHL", 3, "BACK", .8 + 11.4 + 1.6 + 9.05, 0., -.6 - 4.4625, 0, "ONLY");
 570   gMC->Gspos("BKHL", 4, "BACK", -.8 - 11.4 - 1.6 - 9.05, 0., -.6 - 4.4625, 0, "ONLY");
 571   gMC->Gspos("BKHL", 5, "BACK", .8 + 11.4+ 1.6 + 9.05, 0., .6 + 8.925 + 1.2 + 4.4625, 0, "ONLY");
 572   gMC->Gspos("BKHL", 6, "BACK", -.8 - 11.4 - 1.6 - 9.05, 0., .6 + 8.925 + 1.2 + 4.4625, 0, "ONLY");
 573   gMC->Gspos("BKHL", 7, "BACK", .8 + 11.4 + 1.6 + 9.05, 0., -.6 - 8.925 - 1.2 - 4.4625, 0, "ONLY");
 574   gMC->Gspos("BKHL", 8, "BACK", -.8 - 11.4 - 1.6 - 9.05, 0., -.6 - 8.925 - 1.2 - 4.4625, 0, "ONLY");
 575 //Place material inside RICH
 576   gMC->Gspos("SRIC", 1, "RICH", 0.,0., 0., 0, "ONLY");
 577   gMC->Gspos("AIR2", 1, "RICH", 66.3 + 1.2505, 1.276-Param()->GapThickness()/2-Param()->QuartzThickness()-Param()->FreonThickness()- .4 - .6 - .05 - .376 -.5 - 3.35, 0., 0, "ONLY");
 578   gMC->Gspos("AIR2", 2, "RICH", -66.3 - 1.2505,1.276-Param()->GapThickness()/2-Param()->QuartzThickness()-Param()->FreonThickness()- .4 - .6 - .05 - .376 -.5 - 3.35, 0., 0, "ONLY");
 579   gMC->Gspos("AIR3", 1, "RICH", 0., 1.276-Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .6 - .05 - .376 -.5 - 3.35, -68.35 - 1.25, 0, "ONLY");
 580   gMC->Gspos("AIR3", 2, "RICH", 0., 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .6 - .05 - .376 -.5 - 3.35,  68.35 + 1.25, 0, "ONLY");
 581   gMC->Gspos("ALUM", 1, "SRIC", 0., 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .6 - .05 - .376 -.025, 0., 0, "ONLY");
 582   gMC->Gspos("HONE", 1, "SRIC", 0., 1.276- Param()->GapThickness()/2  - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .6 - .05 - .188, 0., 0, "ONLY");
 583   gMC->Gspos("ALUM", 2, "SRIC", 0., 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .6 - .025, 0., 0, "ONLY");
 584   gMC->Gspos("FOOT", 1, "SRIC", 64.95, 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .3, 36.9, 0, "ONLY");
 585   gMC->Gspos("FOOT", 2, "SRIC", 21.65, 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .3 , 36.9, 0, "ONLY");
 586   gMC->Gspos("FOOT", 3, "SRIC", -21.65, 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .3, 36.9, 0, "ONLY");
 587   gMC->Gspos("FOOT", 4, "SRIC", -64.95, 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .3, 36.9, 0, "ONLY");
 588   gMC->Gspos("FOOT", 5, "SRIC", 64.95, 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .3, -36.9, 0, "ONLY");
 589   gMC->Gspos("FOOT", 6, "SRIC", 21.65, 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .3, -36.9, 0, "ONLY");
 590   gMC->Gspos("FOOT", 7, "SRIC", -21.65, 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .3, -36.9, 0, "ONLY");
 591   gMC->Gspos("FOOT", 8, "SRIC", -64.95, 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .3, -36.9, 0, "ONLY");
 592   gMC->Gspos("OQUA", 1, "SRIC", 0., 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .2, 0., 0, "ONLY");
 593 // Methane supports
 594   gMC->Gspos("SMLG", 1, "SRIC", pcX/2 + (66.3 - pcX/2)/2, 1.276 + .25, 0., 0, "ONLY");
 595   gMC->Gspos("SMLG", 2, "SRIC", - pcX/2 - (66.3 - pcX/2)/2, 1.276 + .25, 0., 0, "ONLY");
 596   gMC->Gspos("SMSH", 1, "SRIC", 0., 1.276 + .25, pcY/2 + (68.35 - pcY/2)/2, 0, "ONLY");
 597   gMC->Gspos("SMSH", 2, "SRIC", 0., 1.276 + .25, - pcY/2 - (68.35 - pcY/2)/2, 0, "ONLY");
 598 //Freon supports
 599   Float_t suppY = 1.276 - Param()->GapThickness()/2- Param()->QuartzThickness() -Param()->FreonThickness() - .2 + .3; //y position of freon supports
 600   gMC->Gspos("SFLG", 1, "SRIC", Param()->QuartzWidth()/2 + (66.3 - Param()->QuartzWidth()/2)/2, suppY, 0., 0, "ONLY");
 601   gMC->Gspos("SFLG", 2, "SRIC", - Param()->QuartzWidth()/2 - (66.3 - Param()->QuartzWidth()/2)/2, suppY, 0., 0, "ONLY");
 602   gMC->Gspos("SFSH", 1, "SRIC", 0., suppY, Param()->QuartzLength()/2 + (68.35 - Param()->QuartzLength()/2)/2, 0, "ONLY");
 603   gMC->Gspos("SFSH", 2, "SRIC", 0., suppY, - Param()->QuartzLength()/2 - (68.35 - Param()->QuartzLength()/2)/2, 0, "ONLY");
 604   AliMatrix(idrotm[1019], 0., 0., 90., 0., 90., 90.);
 605 //Place spacers
 606   Int_t nspacers = 30;
 607   for (i = 0; i < nspacers/3; i++) {
 608     zs = -11.6/2 + (TMath::Abs(nspacers/6) - i) * 12.2;
 609     gMC->Gspos("SPAC", i, "FRE1", 10.5, 0., zs, idrotm[1019], "ONLY");  //Original settings
 610   }
 611   for (i = nspacers/3; i < (nspacers*2)/3; i++) {
 612     zs = -11.6/2 + (nspacers/3 + TMath::Abs(nspacers/6) - i) * 12.2;
 613     gMC->Gspos("SPAC", i, "FRE1", 0, 0., zs, idrotm[1019], "ONLY");  //Original settings
 614   }
 615   for (i = (nspacers*2)/3; i < nspacers; ++i) {
 616     zs = -11.6/2 + ((nspacers*2)/3 + TMath::Abs(nspacers/6) - i) * 12.2;
 617     gMC->Gspos("SPAC", i, "FRE1", -10.5, 0., zs, idrotm[1019], "ONLY"); //Original settings
 618   }
 619   for (i = 0; i < nspacers/3; i++) {
 620     zs = -11.6/2 + (TMath::Abs(nspacers/6) - i) * 12.2;
 621     gMC->Gspos("SPAC", i, "FRE2", 10.5, 0., zs, idrotm[1019], "ONLY");  //Original settings
 622   }
 623   for (i = nspacers/3; i < (nspacers*2)/3; i++) {
 624     zs = -11.6/2 + (nspacers/3 + TMath::Abs(nspacers/6) - i) * 12.2;
 625     gMC->Gspos("SPAC", i, "FRE2", 0, 0., zs, idrotm[1019], "ONLY");  //Original settings
 626   }
 627   for (i = (nspacers*2)/3; i < nspacers; ++i) {
 628     zs = -11.6/2 + ((nspacers*2)/3 + TMath::Abs(nspacers/6) - i) * 12.2;
 629     gMC->Gspos("SPAC", i, "FRE2", -10.5, 0., zs, idrotm[1019], "ONLY"); //Original settings
 630   }
 631   gMC->Gspos("FRE1", 1, "OQF1", 0., 0., 0., 0, "ONLY");
 632   gMC->Gspos("FRE2", 1, "OQF2", 0., 0., 0., 0, "ONLY");
 633   gMC->Gspos("OQF1", 1, "SRIC", Param()->OuterFreonWidth()/2 + Param()->InnerFreonWidth()/2 + 2, 1.276 - Param()->GapThickness()/2- Param()->QuartzThickness() -Param()->FreonThickness()/2, 0., 0, "ONLY"); //Original settings (31.3)
 634   gMC->Gspos("OQF2", 2, "SRIC", 0., 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()/2, 0., 0, "ONLY");          //Original settings
 635   gMC->Gspos("OQF1", 3, "SRIC", - (Param()->OuterFreonWidth()/2 + Param()->InnerFreonWidth()/2) - 2, 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()/2, 0., 0, "ONLY");       //Original settings (-31.3)
 636   gMC->Gspos("QUAR", 1, "SRIC", 0., 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness()/2, 0., 0, "ONLY");
 637   gMC->Gspos("GAP ", 1, "META", 0., Param()->GapThickness()/2 - Param()->ProximityGap()/2 - 0.0001, 0., 0, "ONLY");
 638   gMC->Gspos("META", 1, "SRIC", 0., 1.276, 0., 0, "ONLY");
 639   gMC->Gspos("CSI ", 1, "SRIC", 0., 1.276 + Param()->GapThickness()/2 + .25, 0., 0, "ONLY");
 640 //Wire support placing
 641   gMC->Gspos("WSG2", 1, "GAP ", 0., Param()->ProximityGap()/2 - .1, 0., 0, "ONLY");
 642   gMC->Gspos("WSG1", 1, "CSI ", 0., 0., 0., 0, "ONLY");
 643   gMC->Gspos("WSMe", 1, "SRIC ", 0., 1.276 + Param()->GapThickness()/2 + .5 + 1.05, 0., 0, "ONLY");
 644 //Backplane placing
 645   gMC->Gspos("BACK", 1, "SRIC ", -33.15, 1.276 + Param()->GapThickness()/2 + .5 + 2.1 + 2, 43.3, 0, "ONLY");
 646   gMC->Gspos("BACK", 2, "SRIC ", 33.15, 1.276 + Param()->GapThickness()/2 + .5 + 2.1 + 2 , 43.3, 0, "ONLY");
 647   gMC->Gspos("BACK", 3, "SRIC ", -33.15, 1.276 + Param()->GapThickness()/2 + .5 + 2.1 + 2, 0., 0, "ONLY");
 648   gMC->Gspos("BACK", 4, "SRIC ", 33.15, 1.276 + Param()->GapThickness()/2 + .5 + 2.1 + 2, 0., 0, "ONLY");
 649   gMC->Gspos("BACK", 5, "SRIC ", 33.15, 1.276 + Param()->GapThickness()/2 + .5 + 2.1 + 2, -43.3, 0, "ONLY");
 650   gMC->Gspos("BACK", 6, "SRIC ", -33.15, 1.276 + Param()->GapThickness()/2 + .5 + 2.1 + 2, -43.3, 0, "ONLY");
 651 //PCB placing
 652   gMC->Gspos("PCB ", 1, "SRIC ", 0.,  1.276 + Param()->GapThickness()/2 + .5 + 1.05, pcX/4 + .5025 + 2.5, 0, "ONLY");
 653   gMC->Gspos("PCB ", 2, "SRIC ", 0.,  1.276 + Param()->GapThickness()/2 + .5 + 1.05, -pcX/4 - .5025 - 2.5, 0, "ONLY");
 654
 655 //place chambers into mother volume ALIC
 656   for(int i=1;i<=kNCH;i++){
 657     AliMatrix(idrotm[1000+i],C(i)->ThetaXd(),C(i)->PhiXd(),
 658                              C(i)->ThetaYd(),C(i)->PhiYd(),
 659                              C(i)->ThetaZd(),C(i)->PhiZd());
 660     gMC->Gspos("RICH",i,"ALIC",C(i)->X(),C(i)->Y(),C(i)->Z(),idrotm[1000+i], "ONLY");
 661   }
 662
 663   if(GetDebug())Info("CreateGeometry","Stop.");
 664 }//void AliRICH::CreateGeometry()
 665 //__________________________________________________________________________________________________
 666 void AliRICH::CreateChambers()
 667 {
 668 //create all RICH Chambers on each call. Previous chambers deleted
 669   if(fChambers) delete fChambers;
 670   if(GetDebug())Info("CreateChambers","Creating RICH chambers.");
 671   fChambers=new TObjArray(kNCH);
 672   fChambers->SetOwner();
 673   for(int i=0;i<kNCH;i++)  fChambers->AddAt(new AliRICHChamber(i+1,Param()),i);
 674 }//void AliRICH::CreateChambers()
 675 //__________________________________________________________________________________________________
 676 void AliRICH::GenerateFeedbacks(Int_t iChamber,Float_t eloss)
 677 {
 678 // Generate FeedBack photons
 679 // eloss=0 means photon so only pulse height distribution is to be analysed. This one is done in AliRICHParam::TotQdc()
 680
 681   TLorentzVector x4;
 682   gMC->TrackPosition(x4);
 683   TVector2 x2=C(iChamber)->Glob2Loc(x4);
 684   Int_t sector=Param()->Sector(x2);
 685   Int_t iTotQdc=Param()->TotQdc(x2,eloss);
 686   Int_t iNphotons=gMC->GetRandom()->Poisson(P()->AlphaFeedback(sector)*iTotQdc);
 687   if(GetDebug())Info("GenerateFeedbacks","N photons=%i",iNphotons);
 688   Int_t j;
 689   Float_t cthf, phif, enfp = 0, sthf, e1[3], e2[3], e3[3], vmod, uswop,dir[3], phi,pol[3], mom[4];
 690 //Generate photons
 691   for(Int_t i=0;i<iNphotons;i++){//feedbacks loop
 692     Double_t ranf[2];
 693     gMC->GetRandom()->RndmArray(2,ranf);    //Sample direction
 694     cthf=ranf[0]*2-1.0;
 695     if(cthf<0) continue;
 696     sthf = TMath::Sqrt((1 - cthf) * (1 + cthf));
 697     phif = ranf[1] * 2 * TMath::Pi();
 698
 699     if(Double_t randomNumber=gMC->GetRandom()->Rndm()<=0.57)
 700       enfp = 7.5e-9;
 701     else if(randomNumber<=0.7)
 702       enfp = 6.4e-9;
 703     else
 704       enfp = 7.9e-9;
 705
 706
 707     dir[0] = sthf * TMath::Sin(phif);    dir[1] = cthf;    dir[2] = sthf * TMath::Cos(phif);
 708     gMC->Gdtom(dir, mom, 2);
 709     mom[0]*=enfp;    mom[1]*=enfp;    mom[2]*=enfp;
 710     mom[3] = TMath::Sqrt(mom[0]*mom[0]+mom[1]*mom[1]+mom[2]*mom[2]);
 711
 712     // Polarisation
 713     e1[0]=      0;    e1[1]=-dir[2];    e1[2]= dir[1];
 714     e2[0]=-dir[1];    e2[1]= dir[0];    e2[2]=      0;
 715     e3[0]= dir[1];    e3[1]=      0;    e3[2]=-dir[0];
 716
 717     vmod=0;
 718     for(j=0;j<3;j++) vmod+=e1[j]*e1[j];
 719     if (!vmod) for(j=0;j<3;j++) {
 720       uswop=e1[j];
 721       e1[j]=e3[j];
 722       e3[j]=uswop;
 723     }
 724     vmod=0;
 725     for(j=0;j<3;j++) vmod+=e2[j]*e2[j];
 726     if (!vmod) for(j=0;j<3;j++) {
 727       uswop=e2[j];
 728       e2[j]=e3[j];
 729       e3[j]=uswop;
 730     }
 731
 732     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;
 733     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;
 734
 735     phi = gMC->GetRandom()->Rndm()* 2 * TMath::Pi();
 736     for(j=0;j<3;j++) pol[j]=e1[j]*TMath::Sin(phi)+e2[j]*TMath::Cos(phi);
 737     gMC->Gdtom(pol, pol, 2);
 738     Int_t outputNtracksStored;
 739     gAlice->GetMCApp()->PushTrack(1,                 //do not transport
 740                      gAlice->GetMCApp()->GetCurrentTrackNumber(),//parent track
 741                      kFeedback,                      //PID
 742                      mom[0],mom[1],mom[2],mom[3],    //track momentum
 743                      x4.X(),x4.Y(),x4.Z(),x4.T(),    //track origin
 744                      pol[0],pol[1],pol[2],           //polarization
 745                      kPFeedBackPhoton,
 746                      outputNtracksStored,
 747                      1.0);
 748   }//feedbacks loop
 749 }//GenerateFeedbacks()
 750 //__________________________________________________________________________________________________