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 <TArrayF.h>
  17 #include <TGeometry.h>
  18 #include <TBRIK.h>
  19 #include <TTUBE.h>
  20 #include <TFile.h>
  21 #include <TNode.h>
  22 #include <TObjArray.h>
  23 #include <AliMagF.h>
  24 #include "AliRICH.h"
  25 #include "AliRICHParam.h"
  26 #include "AliRICHRecHit1D.h"
  27 #include "AliRICHRecHit3D.h"
  28 #include <AliRun.h>
  29 #include <AliRunDigitizer.h>
  30
  31 ClassImp(AliRICHhit)
  32 //__________________________________________________________________________________________________
  33 void AliRICHhit::Print(Option_t*)const
  34 {
  35   Info("","chamber=%2i, PID=%9i, TID=%6i, eloss=%9.3f eV",fChamber,fPid,fTrack,fEloss*1e9);
  36 }//void AliRICHdigit::Print(Option_t *option)const
  37 //__________________________________________________________________________________________________
  38 ClassImp(AliRICHdigit)
  39 //__________________________________________________________________________________________________
  40 void AliRICHdigit::Print(Option_t*)const
  41 {
  42   Info("","ID=%6i, chamber=%2i, PadX=%3i, PadY=%3i, Qdc=%4i, TID1=%5i, TID2=%5i, TID3=%5i",
  43          Id(),fChamber,fPadX,fPadY,fQdc,fTracks[0],fTracks[1],fTracks[2]);
  44 }//void AliRICHdigit::Print(Option_t *option)const
  45 //__________________________________________________________________________________________________
  46
  47 ClassImp(AliRICH)
  48 //__________________________________________________________________________________________________
  49 // RICH manager class
  50 //BEGIN_HTML
  51 /*
  52   <img src="gif/alirich.gif">
  53 */
  54 //END_HTML
  55 //__________________________________________________________________________________________________
  56 AliRICH::AliRICH()
  57         :AliDetector()
  58 {//Default ctor should not contain any new operators
  59   fpParam     =0;
  60   fChambers   =0;
  61 //AliDetector ctor deals with Hits and Digits
  62   fSdigits    =0; fNsdigits   =0;
  63   fDigitsNew  =0; for(int i=0;i<kNCH;i++) fNdigitsNew[i]  =0;
  64   fClusters   =0; for(int i=0;i<kNCH;i++) fNclusters[i]=0;
  65
  66   fCerenkovs  =0; fNcerenkovs =0;
  67   fSpecials   =0; fNspecials  =0;
  68   fDchambers  =0; for(int i=0;i<kNCH;i++) fNdch[i]=0;
  69   fRawClusters=0; for(int i=0;i<kNCH;i++) fNrawch[i]=0;
  70   fRecHits1D  =0; for(int i=0;i<kNCH;i++) fNrechits1D[i]=0;
  71   fRecHits3D  =0; for(int i=0;i<kNCH;i++) fNrechits3D[i]=0;
  72   fCkovNumber=fFreonProd=0;
  73 }//AliRICH::AliRICH()
  74 //__________________________________________________________________________________________________
  75 AliRICH::AliRICH(const char *name, const char *title)
  76         :AliDetector(name,title)
  77 {//Named ctor
  78   if(GetDebug())Info("named ctor","Start.");
  79   fpParam     =   new AliRICHParam;
  80   fChambers = 0;  CreateChambers();
  81 //AliDetector ctor deals with Hits and Digits (reset them to 0, does not create them)
  82   fHits=       0;     CreateHits();          gAlice->AddHitList(fHits);
  83   fSdigits=    0;
  84   fDigitsNew=  0;
  85   fClusters=   0;
  86
  87   fCerenkovs=  0;     CreateCerenkovsOld();  gAlice->AddHitList(fCerenkovs);
  88   fSpecials=   0;     CreateSpecialsOld();
  89   fDchambers=  0;   //CreateDigitsOld();
  90   fRawClusters=0;   //CreateRawClustersOld();
  91   fRecHits1D=  0;   //CreateRecos1Old();
  92   fRecHits3D=  0;   //CreateRecos3Old();
  93
  94   fCkovNumber=fFreonProd=0;
  95   if(GetDebug())Info("named ctor","Stop.");
  96 }//AliRICH::AliRICH(const char *name, const char *title)
  97 //__________________________________________________________________________________________________
  98 AliRICH::~AliRICH()
  99 {//dtor
 100   if(GetDebug()) Info("dtor","Start.");
 101
 102   if(fpParam)    delete fpParam;
 103   if(fChambers)  delete fChambers;
 104
 105   if(fHits)      delete fHits;
 106   if(fSdigits)   delete fSdigits;
 107   if(fDigits)    delete fDigits;
 108   if(fDigitsNew) {fDigitsNew->Delete();   delete fDigitsNew;}
 109   if(fClusters)  {fClusters->Delete();    delete fClusters;}
 110
 111   if(fCerenkovs) delete fCerenkovs;
 112   if(fSpecials)  delete fSpecials;
 113   if(fDchambers)   {fDchambers->Delete();     delete fDchambers;}
 114   if(fRawClusters) {fRawClusters->Delete();   delete fRawClusters;}
 115   if(fRecHits1D) {fRecHits1D->Delete();       delete fRecHits1D;}
 116   if(fRecHits3D) {fRecHits3D->Delete();       delete fRecHits3D;}
 117   if(GetDebug()) Info("dtor","Stop.");
 118 }//AliRICH::~AliRICH()
 119 //__________________________________________________________________________________________________
 120 void AliRICH::Hits2SDigits()
 121 {//Create a list of sdigits corresponding to list of hits. Every hit generates one or more sdigits.
 122   if(GetDebug()) Info("Hit2SDigits","Start.");
 123   GetLoader()->LoadHits();
 124
 125   for(Int_t iEventN=0;iEventN<gAlice->GetEventsPerRun();iEventN++){//events loop
 126     gAlice->GetRunLoader()->GetEvent(iEventN);
 127
 128     GetLoader()->MakeTree("S");  MakeBranch("S");
 129     ResetSdigits();  ResetSpecialsOld();
 130
 131     for(Int_t iPrimN=0;iPrimN<GetLoader()->TreeH()->GetEntries();iPrimN++){//prims loop
 132       GetLoader()->TreeH()->GetEntry(iPrimN);
 133       for(Int_t i=0;i<Specials()->GetEntries();i++){//specials loop
 134         Int_t padx= ((AliRICHSDigit*)Specials()->At(i))->PadX();
 135         Int_t pady= ((AliRICHSDigit*)Specials()->At(i))->PadY();
 136         Int_t qdc=  ((AliRICHSDigit*)Specials()->At(i))->QPad();
 137         Int_t hitN= ((AliRICHSDigit*)Specials()->At(i))->HitNumber()-1;//!!! important -1
 138         Int_t chamber=((AliRICHhit*)Hits()->At(hitN))->C();
 139         Int_t track=((AliRICHhit*)Hits()->At(hitN))->GetTrack();
 140         AddSdigit(chamber,padx+Param()->NpadsX()/2,pady+Param()->NpadsY()/2,qdc,track);
 141       }//specials loop
 142     }//prims loop
 143     GetLoader()->TreeS()->Fill();
 144     GetLoader()->WriteSDigits("OVERWRITE");
 145     if(GetDebug()) Info("Hit2SDigits","Event %i processed.",iEventN);
 146   }//events loop
 147   GetLoader()->UnloadHits();   GetLoader()->UnloadSDigits();
 148   ResetHits();                 ResetSdigits();
 149   if(GetDebug()) Info("Hit2SDigits","Stop.");
 150 }//void AliRICH::Hits2SDigits()
 151 //__________________________________________________________________________________________________
 152 void AliRICH::SDigits2Digits()
 153 {//Generate digits from sdigits.
 154   if(GetDebug()) Info("SDigits2Digits","Start.");
 155
 156   GetLoader()->LoadSDigits();
 157
 158   for(Int_t iEventN=0;iEventN<gAlice->GetEventsPerRun();iEventN++){//events loop
 159     gAlice->GetRunLoader()->GetEvent(iEventN);
 160
 161     GetLoader()->MakeTree("D");  MakeBranch("D"); //create TreeD with RICH branches
 162     ResetSdigits();ResetDigitsOld();//reset lists of sdigits and digits
 163     GetLoader()->TreeS()->GetEntry(0);
 164     Sdigits()->Sort();
 165
 166     Int_t kBad=-101;
 167
 168     Int_t tr[3],q[3],dig[5]; for(Int_t i=0;i<3;i++) tr[i]=q[i]=kBad;    for(Int_t i=0;i<5;i++) dig[i]=kBad;
 169     Int_t chamber=kBad,id=kBad,iNdigitsPerPad=kBad;//how many sdigits for a given pad
 170
 171     for(Int_t i=0;i<Sdigits()->GetEntries();i++){//sdigits loop (sorted)
 172       AliRICHdigit *pSdig=(AliRICHdigit*)Sdigits()->At(i);
 173       if(pSdig->Id()==id){//still the same pad
 174         iNdigitsPerPad++;
 175         dig[2]+=pSdig->Qdc();//sum up qdc
 176         if(iNdigitsPerPad<=3)
 177           tr[iNdigitsPerPad-1]=pSdig->T(0);
 178         else
 179           Info("","More then 3 sdigits for the given pad");
 180       }else{//new pad, add the pevious one
 181         if(id!=kBad) AddDigitOld(chamber,tr,q,dig);
 182         chamber=pSdig->C();dig[0]=pSdig->X();dig[1]=pSdig->Y();dig[2]=pSdig->Qdc();tr[0]=pSdig->T(0);id=pSdig->Id();
 183         iNdigitsPerPad=1;tr[1]=tr[2]=kBad;
 184       }
 185     }//sdigits loop (sorted)
 186     AddDigitOld(chamber,tr,q,dig);//add the last digit
 187
 188     GetLoader()->TreeD()->Fill();
 189     GetLoader()->WriteDigits("OVERWRITE");
 190     if(GetDebug()) Info("SDigits2Digits","Event %i processed.",iEventN);
 191   }//events loop
 192   GetLoader()->UnloadSDigits();  GetLoader()->UnloadDigits();
 193   ResetSdigits();                ResetDigitsOld();
 194   if(GetDebug()) Info("SDigits2Digits","Stop.");
 195 }//void AliRICH::SDigits2Digits()
 196 //__________________________________________________________________________________________________
 197 void AliRICH::Digits2Reco()
 198 {//Generate clusters from digits then generate recos from clusters or digits
 199   if(GetDebug()) Info("Digits2reco","Start.");
 200
 201 }//void AliRICH::Digits2Reco()
 202 //__________________________________________________________________________________________________
 203 void AliRICH::AddRecHit1D(Int_t id, Float_t *rechit, Float_t *photons, Int_t *padsx, Int_t* padsy)
 204 {// Add a RICH reconstructed hit to the list
 205
 206     TClonesArray &lrec1D = *((TClonesArray*)fRecHits1D->At(id));
 207     new(lrec1D[fNrechits1D[id]++]) AliRICHRecHit1D(id,rechit,photons,padsx,padsy);
 208 }
 209 //_____________________________________________________________________________
 210 void AliRICH::AddRecHit3D(Int_t id, Float_t *rechit, Float_t omega, Float_t theta, Float_t phi)
 211 {// Add a RICH reconstructed hit to the list
 212
 213     TClonesArray &lrec3D = *((TClonesArray*)fRecHits3D->At(id));
 214     new(lrec3D[fNrechits3D[id]++]) AliRICHRecHit3D(id,rechit,omega,theta,phi);
 215 }
 216 //______________________________________________________________________________
 217 void AliRICH::BuildGeometry()
 218 {//Builds a TNode geometry for event display
 219   if(GetDebug())Info("BuildGeometry","Start.");
 220
 221   TNode *node, *subnode, *top;
 222   top=gAlice->GetGeometry()->GetNode("alice");
 223
 224   new TBRIK("S_RICH","S_RICH","void",71.09999,11.5,73.15);
 225
 226   Float_t wid=Param()->SectorSizeX();
 227   Float_t len=Param()->SectorSizeY();
 228   new TBRIK("PHOTO","PHOTO","void",wid/2,0.1,len/2);
 229
 230   for(int i=1;i<=kNCH;i++){
 231     top->cd();
 232     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());
 233     node->SetLineColor(kRed);
 234     node->cd();
 235     subnode = new TNode("PHOTO1","PHOTO1","PHOTO",wid+Param()->DeadZone(),5,len/2+Param()->DeadZone()/2,"");
 236     subnode->SetLineColor(kGreen);
 237     fNodes->Add(subnode);
 238     subnode = new TNode("PHOTO1","PHOTO1","PHOTO",0,5,len/2+Param()->DeadZone()/2,"");
 239     subnode->SetLineColor(kGreen);
 240     fNodes->Add(subnode);
 241     subnode = new TNode("PHOTO1","PHOTO1","PHOTO",-wid-Param()->DeadZone(),5,len/2+Param()->DeadZone()/2,"");
 242     subnode->SetLineColor(kGreen);
 243     fNodes->Add(subnode);
 244     subnode = new TNode("PHOTO1","PHOTO1","PHOTO",wid+Param()->DeadZone(),5,-len/2-Param()->DeadZone()/2,"");
 245     subnode->SetLineColor(kGreen);
 246     fNodes->Add(subnode);
 247     subnode = new TNode("PHOTO1","PHOTO1","PHOTO",0,5,-len/2 -Param()->DeadZone()/2,"");
 248     subnode->SetLineColor(kGreen);
 249     fNodes->Add(subnode);
 250     subnode = new TNode("PHOTO1","PHOTO1","PHOTO",-wid-Param()->DeadZone(),5,-len/2 - Param()->DeadZone()/2,"");
 251     subnode->SetLineColor(kGreen);
 252     fNodes->Add(subnode);
 253     fNodes->Add(node);
 254   }
 255   if(GetDebug())Info("BuildGeometry","Stop.");
 256 }//void AliRICH::BuildGeometry()
 257
 258 static Int_t kCSI=6;
 259 static Int_t kGAP=9;
 260 //______________________________________________________________________________
 261 void AliRICH::CreateMaterials()
 262 {
 263     //
 264     // *** DEFINITION OF AVAILABLE RICH MATERIALS ***
 265     // ORIGIN    : NICK VAN EIJNDHOVEN
 266     // Modified by:  N. Colonna (INFN - BARI, Nicola.Colonna@ba.infn.it)
 267     //               R.A. Fini  (INFN - BARI, Rosanna.Fini@ba.infn.it)
 268     //               R.A. Loconsole (Bari University, loco@riscom.ba.infn.it)
 269     //
 270     Int_t i;
 271
 272     //Photons energy intervals
 273     Float_t ppckov[26];
 274     for (i=0;i<26;i++)
 275     {
 276         ppckov[i] = (Float_t(i)*0.1+5.5)*1e-9;
 277     }
 278
 279
 280     //Refraction index for quarz
 281     Float_t rIndexQuarz[26];
 282     Float_t  e1= 10.666;
 283     Float_t  e2= 18.125;
 284     Float_t  f1= 46.411;
 285     Float_t  f2= 228.71;
 286     for (i=0;i<26;i++)
 287     {
 288         Float_t ene=ppckov[i]*1e9;
 289         Float_t a=f1/(e1*e1 - ene*ene);
 290         Float_t b=f2/(e2*e2 - ene*ene);
 291         rIndexQuarz[i] = TMath::Sqrt(1. + a + b );
 292     }
 293
 294     //Refraction index for opaque quarz, methane and grid
 295     Float_t rIndexOpaqueQuarz[26];
 296     Float_t rIndexMethane[26];
 297     Float_t rIndexGrid[26];
 298     for (i=0;i<26;i++)
 299     {
 300         rIndexOpaqueQuarz[i]=1;
 301         rIndexMethane[i]=1.000444;
 302         rIndexGrid[i]=1;
 303     }
 304
 305     //Absorption index for freon
 306     Float_t abscoFreon[26] = {179.0987, 179.0987, 179.0987, 179.0987, 179.0987,  179.0987, 179.0987, 179.0987,
 307                                179.0987, 142.9206, 56.64957, 25.58622, 13.95293, 12.03905, 10.42953, 8.804196,
 308                                7.069031, 4.461292, 2.028366, 1.293013, .577267,   .40746,  .334964, 0., 0., 0.};
 309
 310
 311     Float_t abscoQuarz [26] = {105.8, 65.52, 48.58, 42.85, 35.79, 31.262, 28.598, 27.527, 25.007, 22.815, 21.004,
 312                                 19.266, 17.525, 15.878, 14.177, 11.719, 9.282, 6.62, 4.0925, 2.601, 1.149, .667, .3627,
 313                                 .192, .1497, .10857};
 314
 315     //Absorption index for methane
 316     Float_t abscoMethane[26];
 317     for (i=0;i<26;i++)
 318     {
 319         abscoMethane[i]=AbsoCH4(ppckov[i]*1e9);
 320     }
 321
 322     //Absorption index for opaque quarz, csi and grid, efficiency for all and grid
 323     Float_t abscoOpaqueQuarz[26];
 324     Float_t abscoCsI[26];
 325     Float_t abscoGrid[26];
 326     Float_t efficAll[26];
 327     Float_t efficGrid[26];
 328     for (i=0;i<26;i++)
 329     {
 330         abscoOpaqueQuarz[i]=1e-5;
 331         abscoCsI[i]=1e-4;
 332         abscoGrid[i]=1e-4;
 333         efficAll[i]=1;
 334         efficGrid[i]=1;
 335     }
 336
 337     //Efficiency for csi
 338
 339     Float_t efficCsI[26] = {0.000199999995, 0.000600000028, 0.000699999975, 0.00499999989, 0.00749999983, 0.010125,
 340                              0.0242999997, 0.0405000001, 0.0688500032, 0.105299994, 0.121500008, 0.141749993, 0.157949999,
 341                              0.162, 0.166050002, 0.167669997, 0.174299985, 0.176789999, 0.179279998, 0.182599992, 0.18592,
 342                              0.187579989, 0.189239994, 0.190899998, 0.207499996, 0.215799987};
 343
 344
 345
 346     //FRESNEL LOSS CORRECTION FOR PERPENDICULAR INCIDENCE AND
 347     //UNPOLARIZED PHOTONS
 348
 349     for (i=0;i<26;i++)
 350     {
 351         efficCsI[i] = efficCsI[i]/(1.-Fresnel(ppckov[i]*1e9,1.,0));
 352     }
 353
 354     /*******************************************End of rich_media.f***************************************/
 355
 356   Float_t rIndexFreon[26];
 357
 358
 359     // --- Photon energy (GeV)
 360     // --- Refraction indexes
 361     for (i = 0; i < 26; ++i) {
 362       rIndexFreon[i] = ppckov[i] * .0172 * 1e9 + 1.177;
 363       //rIndexFreon[i] = 1;
 364     }
 365
 366
 367   Float_t a=0,z=0,den=0,radl=0,absl=0;
 368   Float_t tmaxfd=-10.0, deemax=-0.2, stemax=-0.1,epsil=0.001, stmin=-0.001;
 369   Int_t   isxfld = gAlice->Field()->Integ();
 370   Float_t sxmgmx = gAlice->Field()->Max();
 371
 372   AliMaterial( 1, "Air     $",a=14.61,z=7.3, den=0.001205,radl=30420.0,absl=67500);//(Air)
 373   AliMedium(1, "DEFAULT MEDIUM AIR$", 1, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 374
 375   AliMaterial( 6, "HON",      a=12.01,z=6.0, den=0.1,     radl=18.8,   absl=0);    //(C)-equivalent radl
 376   AliMedium(2, "HONEYCOMB$", 6, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 377
 378   AliMaterial(16, "CSI",      a=12.01,z=6.0, den=0.1,     radl=18.8,   absl=0);    //CsI-radl equivalent
 379   AliMedium(kCSI, "CSI$", 16, 1, isxfld, sxmgmx,tmaxfd, stemax, deemax, epsil, stmin);
 380
 381   AliMaterial(11, "GRI",      a=63.54,z=29.0,den=8.96,    radl=1.43,   absl=0);    //anode grid (Cu)
 382   AliMedium(7, "GRIGLIA$", 11, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 383
 384   AliMaterial(50, "ALUM",     a=26.98,z=13.0,den=2.7,     radl=8.9,    absl=0);    //aluminium sheet (Al)
 385   AliMedium(10, "ALUMINUM$", 50, 1, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 386
 387   AliMaterial(31, "COPPER$",  a=63.54,z=29.0,den=8.96,    radl=1.4,    absl=0);    //(Cu)
 388   AliMedium(12, "PCB_COPPER", 31, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 389
 390   Float_t  aQuartz[2]={28.09,16.0};  Float_t  zQuartz[2]={14.00, 8.0};  Float_t  wmatQuartz[2]={1,2};
 391   AliMixture (20, "QUA",aQuartz,zQuartz,den=2.64,-2, wmatQuartz);//Quarz (SiO2) - trasnparent
 392   AliMedium(3, "QUARZO$", 20, 1, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 393
 394   AliMixture (21, "QUAO",aQuartz, zQuartz, den=2.64, -2, wmatQuartz);//Quarz (SiO2) - opaque
 395   AliMedium(8, "QUARZOO$", 21, 1, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 396
 397   Float_t  aFreon[2]={12,19};  Float_t  zFreon[2]={6,9};  Float_t wmatFreon[2]={6,14};
 398   AliMixture (30, "FRE",aFreon,zFreon,den=1.7,-2,wmatFreon);//Freon (C6F14)
 399   AliMedium(4, "FREON$", 30, 1, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 400
 401   Float_t aMethane[2]={12.01,1}; Float_t zMethane[2]={6,1}; Float_t wmatMethane[2]={1,4};
 402   AliMixture (40, "MET", aMethane, zMethane, den=7.17e-4,-2, wmatMethane);//methane (CH4)
 403   AliMedium(5, "METANO$", 40, 1, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 404
 405   AliMixture (41, "METG", aMethane, zMethane, den=7.17e-4, -2, wmatMethane);
 406   AliMedium(kGAP, "GAP$", 41, 1, isxfld, sxmgmx,tmaxfd, 0.1, -deemax, epsil, -stmin);
 407
 408   Float_t aGlass[5]={12.01, 28.09, 16.,   10.8,  23.};
 409   Float_t zGlass[5]={ 6.,   14.,    8.,    5.,   11.};
 410   Float_t wGlass[5]={ 0.5,  0.105, 0.355, 0.03,  0.01};
 411   AliMixture (32, "GLASS",aGlass, zGlass, den=1.74, 5, wGlass);//Glass 50%C+10.5%Si+35.5%O+3% + 1%
 412   AliMedium(11, "GLASS", 32, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 413
 414   Int_t *idtmed = fIdtmed->GetArray()-999;
 415   gMC->SetCerenkov(idtmed[1000], 26, ppckov, abscoMethane,     efficAll,  rIndexMethane);
 416   gMC->SetCerenkov(idtmed[1001], 26, ppckov, abscoMethane,     efficAll,  rIndexMethane);
 417   gMC->SetCerenkov(idtmed[1002], 26, ppckov, abscoQuarz,       efficAll,  rIndexQuarz);
 418   gMC->SetCerenkov(idtmed[1003], 26, ppckov, abscoFreon,       efficAll,  rIndexFreon);
 419   gMC->SetCerenkov(idtmed[1004], 26, ppckov, abscoMethane,     efficAll,  rIndexMethane);
 420   gMC->SetCerenkov(idtmed[1005], 26, ppckov, abscoCsI,         efficCsI,  rIndexMethane);
 421   gMC->SetCerenkov(idtmed[1006], 26, ppckov, abscoGrid,        efficGrid, rIndexGrid);
 422   gMC->SetCerenkov(idtmed[1007], 26, ppckov, abscoOpaqueQuarz, efficAll,  rIndexOpaqueQuarz);
 423   gMC->SetCerenkov(idtmed[1008], 26, ppckov, abscoMethane,     efficAll,  rIndexMethane);
 424   gMC->SetCerenkov(idtmed[1009], 26, ppckov, abscoGrid,        efficGrid, rIndexGrid);
 425   gMC->SetCerenkov(idtmed[1010], 26, ppckov, abscoOpaqueQuarz, efficAll,  rIndexOpaqueQuarz);
 426 }//void AliRICH::CreateMaterials()
 427 //__________________________________________________________________________________________________
 428 Float_t AliRICH::Fresnel(Float_t ene,Float_t pdoti, Bool_t pola)
 429 {
 430
 431     //ENE(EV), PDOTI=COS(INC.ANG.), PDOTR=COS(POL.PLANE ROT.ANG.)
 432
 433     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,
 434                       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,
 435                       7.8,7.9,8.0,8.1,8.2,8.3,8.4,8.5};
 436     Float_t csin[36] = {2.14,2.21,2.33,2.48,2.76,2.97,2.99,2.59,2.81,3.05,
 437                         2.86,2.53,2.55,2.66,2.79,2.96,3.18,3.05,2.84,2.81,2.38,2.11,
 438                         2.01,2.13,2.39,2.73,3.08,3.15,2.95,2.73,2.56,2.41,2.12,1.95,
 439                         1.72,1.53};
 440     Float_t csik[36] = {0.,0.,0.,0.,0.,0.196,0.408,0.208,0.118,0.49,0.784,0.543,
 441                         0.424,0.404,0.371,0.514,0.922,1.102,1.139,1.376,1.461,1.253,0.878,
 442                         0.69,0.612,0.649,0.824,1.347,1.571,1.678,1.763,1.857,1.824,1.824,
 443                         1.714,1.498};
 444     Float_t xe=ene;
 445     Int_t  j=Int_t(xe*10)-49;
 446     Float_t cn=csin[j]+((csin[j+1]-csin[j])/0.1)*(xe-en[j]);
 447     Float_t ck=csik[j]+((csik[j+1]-csik[j])/0.1)*(xe-en[j]);
 448
 449     //FORMULAE FROM HANDBOOK OF OPTICS, 33.23 OR
 450     //W.R. HUNTER, J.O.S.A. 54 (1964),15 , J.O.S.A. 55(1965),1197
 451
 452     Float_t sinin=TMath::Sqrt(1-pdoti*pdoti);
 453     Float_t tanin=sinin/pdoti;
 454
 455     Float_t c1=cn*cn-ck*ck-sinin*sinin;
 456     Float_t c2=4*cn*cn*ck*ck;
 457     Float_t aO=TMath::Sqrt(0.5*(TMath::Sqrt(c1*c1+c2)+c1));
 458     Float_t b2=0.5*(TMath::Sqrt(c1*c1+c2)-c1);
 459
 460     Float_t rs=((aO-pdoti)*(aO-pdoti)+b2)/((aO+pdoti)*(aO+pdoti)+b2);
 461     Float_t rp=rs*((aO-sinin*tanin)*(aO-sinin*tanin)+b2)/((aO+sinin*tanin)*(aO+sinin*tanin)+b2);
 462
 463
 464     //CORRECTION FACTOR FOR SURFACE ROUGHNESS
 465     //B.J. STAGG  APPLIED OPTICS, 30(1991),4113
 466
 467     Float_t sigraf=18.;
 468     Float_t lamb=1240/ene;
 469     Float_t fresn;
 470
 471     Float_t  rO=TMath::Exp(-(4*TMath::Pi()*pdoti*sigraf/lamb)*(4*TMath::Pi()*pdoti*sigraf/lamb));
 472
 473     if(pola)
 474     {
 475         Float_t pdotr=0.8;                                 //DEGREE OF POLARIZATION : 1->P , -1->S
 476         fresn=0.5*(rp*(1+pdotr)+rs*(1-pdotr));
 477     }
 478     else
 479         fresn=0.5*(rp+rs);
 480
 481     fresn = fresn*rO;
 482     return(fresn);
 483 }//Float_t AliRICH::Fresnel(Float_t ene,Float_t pdoti, Bool_t pola)
 484 //__________________________________________________________________________________________________
 485 Float_t AliRICH::AbsoCH4(Float_t x)
 486 {
 487
 488     //KLOSCH,SCH4(9),WL(9),EM(9),ALENGTH(31)
 489     Float_t sch4[9] = {.12,.16,.23,.38,.86,2.8,7.9,28.,80.};              //MB X 10^22
 490     //Float_t wl[9] = {153.,152.,151.,150.,149.,148.,147.,146.,145};
 491     Float_t em[9] = {8.1,8.158,8.212,8.267,8.322,8.378,8.435,8.493,8.55};
 492     const Float_t kLosch=2.686763E19;                                      // LOSCHMIDT NUMBER IN CM-3
 493     const Float_t kIgas1=100, kIgas2=0, kOxy=10., kWater=5., kPressure=750.,kTemperature=283.;
 494     Float_t pn=kPressure/760.;
 495     Float_t tn=kTemperature/273.16;
 496
 497
 498 // ------- METHANE CROSS SECTION -----------------
 499 // ASTROPH. J. 214, L47 (1978)
 500
 501     Float_t sm=0;
 502     if (x<7.75)
 503         sm=.06e-22;
 504
 505     if(x>=7.75 && x<=8.1)
 506     {
 507         Float_t c0=-1.655279e-1;
 508         Float_t c1=6.307392e-2;
 509         Float_t c2=-8.011441e-3;
 510         Float_t c3=3.392126e-4;
 511         sm=(c0+c1*x+c2*x*x+c3*x*x*x)*1.e-18;
 512     }
 513
 514     if (x> 8.1)
 515     {
 516         Int_t j=0;
 517         while (x<=em[j] && x>=em[j+1])
 518         {
 519             j++;
 520             Float_t a=(sch4[j+1]-sch4[j])/(em[j+1]-em[j]);
 521             sm=(sch4[j]+a*(x-em[j]))*1e-22;
 522         }
 523     }
 524
 525     Float_t dm=(kIgas1/100.)*(1.-((kOxy+kWater)/1.e6))*kLosch*pn/tn;
 526     Float_t abslm=1./sm/dm;
 527
 528 //    ------- ISOBUTHANE CROSS SECTION --------------
 529 //     i-C4H10 (ai) abs. length from curves in
 530 //     Lu-McDonald paper for BARI RICH workshop .
 531 //     -----------------------------------------------------------
 532
 533     Float_t ai;
 534     Float_t absli;
 535     if (kIgas2 != 0)
 536     {
 537         if (x<7.25)
 538             ai=100000000.;
 539
 540         if(x>=7.25 && x<7.375)
 541             ai=24.3;
 542
 543         if(x>=7.375)
 544             ai=.0000000001;
 545
 546         Float_t si = 1./(ai*kLosch*273.16/293.);                    // ISOB. CRO.SEC.IN CM2
 547         Float_t di=(kIgas2/100.)*(1.-((kOxy+kWater)/1.e6))*kLosch*pn/tn;
 548         absli =1./si/di;
 549     }
 550     else
 551         absli=1.e18;
 552 //    ---------------------------------------------------------
 553 //
 554 //       transmission of O2
 555 //
 556 //       y= path in cm, x=energy in eV
 557 //       so= cross section for UV absorption in cm2
 558 //       do= O2 molecular density in cm-3
 559 //    ---------------------------------------------------------
 560
 561     Float_t abslo;
 562     Float_t so=0;
 563     if(x>=6.0)
 564     {
 565         if(x>=6.0 && x<6.5)
 566         {
 567             so=3.392709e-13 * TMath::Exp(2.864104 *x);
 568             so=so*1e-18;
 569         }
 570
 571         if(x>=6.5 && x<7.0)
 572         {
 573             so=2.910039e-34 * TMath::Exp(10.3337*x);
 574             so=so*1e-18;
 575         }
 576
 577
 578         if (x>=7.0)
 579         {
 580             Float_t a0=-73770.76;
 581             Float_t a1=46190.69;
 582             Float_t a2=-11475.44;
 583             Float_t a3=1412.611;
 584             Float_t a4=-86.07027;
 585             Float_t a5=2.074234;
 586             so= a0+(a1*x)+(a2*x*x)+(a3*x*x*x)+(a4*x*x*x*x)+(a5*x*x*x*x*x);
 587             so=so*1e-18;
 588         }
 589
 590         Float_t dox=(kOxy/1e6)*kLosch*pn/tn;
 591         abslo=1./so/dox;
 592     }
 593     else
 594         abslo=1.e18;
 595 //     ---------------------------------------------------------
 596 //
 597 //       transmission of H2O
 598 //
 599 //       y= path in cm, x=energy in eV
 600 //       sw= cross section for UV absorption in cm2
 601 //       dw= H2O molecular density in cm-3
 602 //     ---------------------------------------------------------
 603
 604     Float_t abslw;
 605
 606     Float_t b0=29231.65;
 607     Float_t b1=-15807.74;
 608     Float_t b2=3192.926;
 609     Float_t b3=-285.4809;
 610     Float_t b4=9.533944;
 611
 612     if(x>6.75)
 613     {
 614         Float_t sw= b0+(b1*x)+(b2*x*x)+(b3*x*x*x)+(b4*x*x*x*x);
 615         sw=sw*1e-18;
 616         Float_t dw=(kWater/1e6)*kLosch*pn/tn;
 617         abslw=1./sw/dw;
 618     }
 619     else
 620         abslw=1.e18;
 621
 622 //    ---------------------------------------------------------
 623
 624     Float_t alength=1./(1./abslm+1./absli+1./abslo+1./abslw);
 625     return (alength);
 626 }
 627 //__________________________________________________________________________________________________
 628 void AliRICH::MakeBranch(Option_t* option)
 629 {//Create Tree branches for the RICH.
 630   if(GetDebug())Info("MakeBranch","Start with option= %s.",option);
 631
 632   const Int_t kBufferSize = 4000;
 633
 634   const char *cH = strstr(option,"H");
 635   const char *cD = strstr(option,"D");
 636   const char *cR = strstr(option,"R");
 637   const char *cS = strstr(option,"S");
 638
 639   if(cH&&TreeH()){//H
 640     CreateHits();      //branch will be created in AliDetector::MakeBranch
 641     CreateCerenkovsOld(); MakeBranchInTree(TreeH(),"RICHCerenkov", &fCerenkovs, kBufferSize,0);
 642     CreateSpecialsOld();  MakeBranchInTree(TreeH(),"RICHSpecials", &fSpecials,kBufferSize,0);
 643   }//H
 644   AliDetector::MakeBranch(option);//this is after cH because we need to guarantee that fHits array is created
 645
 646   if(cS&&fLoader->TreeS()){//S
 647     CreateSdigits();   MakeBranchInTree(fLoader->TreeS(),"RICH",&fSdigits,kBufferSize,0) ;
 648   }//S
 649
 650   if(cD&&fLoader->TreeD()){//D
 651     CreateDigits();
 652     CreateDigitsOld();
 653     for(int i=0;i<kNCH;i++){
 654       MakeBranchInTree(fLoader->TreeD(),Form("%sDigits%d",GetName(),i+1),&((*fDchambers)[i]),kBufferSize,0);
 655       MakeBranchInTree(fLoader->TreeD(),Form("%s%d",GetName(),i+1),&((*fDigitsNew)[i]),kBufferSize,0);
 656     }
 657   }//D
 658
 659   if(cR&&fLoader->TreeR()){//R
 660     CreateRawClustersOld();
 661     for(int i=0; i<kNCH ;i++)
 662       MakeBranchInTree(fLoader->TreeR(),Form("%sRawClusters%d",GetName(),i+1), &((*fRawClusters)[i]), kBufferSize, 0);
 663
 664     CreateRecos1Old();
 665     for(int i=0; i<kNCH ;i++)
 666       MakeBranchInTree(fLoader->TreeR(),Form("%sRecHits1D%d",GetName(),i+1),&((*fRecHits1D)[i]),kBufferSize,0);
 667
 668     CreateRecos3Old();
 669     for(int i=0; i<kNCH ;i++)
 670       MakeBranchInTree(fLoader->TreeR(),Form("%sRecHits3D%d",GetName(),i+1), &((*fRecHits3D)[i]), kBufferSize, 0);
 671    }//R
 672   if(GetDebug())Info("MakeBranch","Stop.");
 673 }//void AliRICH::MakeBranch(Option_t* option)
 674 //__________________________________________________________________________________________________
 675 void AliRICH::SetTreeAddress()
 676 {//Set branch address for the Hits and Digits Tree.
 677   if(GetDebug())Info("SetTreeAddress","Start.");
 678
 679   TBranch *branch;
 680
 681   if(fLoader->TreeH()){//H
 682     if(GetDebug())Info("SetTreeAddress","tree H is requested.");
 683     CreateHits();//branch map will be in AliDetector::SetTreeAddress
 684     branch=fLoader->TreeH()->GetBranch("RICHCerenkov");   if(branch){CreateCerenkovsOld(); branch->SetAddress(&fCerenkovs);}
 685     branch=fLoader->TreeH()->GetBranch("RICHSpecials");   if(branch){CreateSpecialsOld();  branch->SetAddress(&fSpecials);}
 686   }//H
 687   AliDetector::SetTreeAddress();//this is after TreeH because we need to guarantee that fHits array is created
 688
 689   if(fLoader->TreeS()){//S
 690     if(GetDebug())Info("SetTreeAddress","tree S is requested.");
 691     branch=fLoader->TreeS()->GetBranch(GetName());        if(branch){CreateSdigits();   branch->SetAddress(&fSdigits);}
 692   }//S
 693
 694   if(fLoader->TreeD()){//D
 695     if(GetDebug())Info("SetTreeAddress","tree D is requested.");
 696     for(int i=0;i<kNCH;i++){
 697       branch=fLoader->TreeD()->GetBranch(Form("%s%d",GetName(),i+1));
 698       if(branch){CreateDigits(); branch->SetAddress(&((*fDigitsNew)[i]));}
 699
 700       branch=fLoader->TreeD()->GetBranch(Form("%sDigits%d",GetName(),i+1));
 701       if(branch){CreateDigitsOld(); branch->SetAddress(&((*fDchambers)[i]));}
 702     }//for
 703   }//D
 704
 705   if(fLoader->TreeR()){//R
 706     if(GetDebug())Info("SetTreeAddress","tree R is requested.");
 707
 708     for(int i=0;i<kNCH;i++){
 709       branch=fLoader->TreeR()->GetBranch(Form("%sClusters%d" ,GetName(),i+1));
 710       if(branch){CreateClusters(); branch->SetAddress(&((*fRawClusters)[i]));}
 711     }
 712
 713     for(int i=0;i<kNCH;i++) {
 714       branch=fLoader->TreeR()->GetBranch(Form("%sRawClusters%d" ,GetName(),i+1));
 715       if(branch){CreateRawClustersOld(); branch->SetAddress(&((*fRawClusters)[i]));}
 716
 717       branch=fLoader->TreeR()->GetBranch(Form("%sRecHits1D%d",GetName(),i+1));
 718       if(branch){CreateRecos1Old(); branch->SetAddress(&((*fRecHits1D)[i]));}
 719
 720       branch=fLoader->TreeR()->GetBranch(Form("%sRecHits3D%d",GetName(),i+1));
 721       if(branch){CreateRecos3Old();branch->SetAddress(&((*fRecHits3D)[i]));}
 722     }
 723   }//R
 724   if(GetDebug())Info("SetTreeAddress","Stop.");
 725 }//void AliRICH::SetTreeAddress()
 726 //__________________________________________________________________________________________________
 727 void AliRICH::Print(Option_t *option)const
 728 {
 729   TObject::Print(option);
 730   Param()->Dump();
 731   fChambers->Print(option);
 732 }//void AliRICH::Print(Option_t *option)const
 733 //__________________________________________________________________________________________________
 734 void AliRICH::CreateGeometry()
 735 {//Creates detailed geometry simulation (currently GEANT volumes tree)
 736   if(GetDebug())Info("CreateGeometry","Start.");
 737 //???????? to be removed to AliRICHParam?
 738   Param()->RadiatorToPads(Param()->FreonThickness()/2+Param()->QuartzThickness()+Param()->GapThickness());
 739
 740 //Opaque quartz thickness
 741   Float_t oqua_thickness = .5;
 742 //CsI dimensions
 743   Float_t pcX=Param()->PcSizeX();
 744   Float_t pcY=Param()->PcSizeY();
 745
 746   Int_t *idtmed = fIdtmed->GetArray()-999;
 747
 748   Int_t i;
 749   Float_t zs;
 750   Int_t idrotm[1099];
 751   Float_t par[3];
 752
 753 //External aluminium box
 754   par[0]=68.8*kcm;par[1]=13*kcm;par[2]=70.86*kcm;  gMC->Gsvolu("RICH", "BOX ", idtmed[1009], par, 3);
 755 //Air
 756   par[0]=66.3;   par[1] = 13; par[2] = 68.35;      gMC->Gsvolu("SRIC", "BOX ", idtmed[1000], par, 3);
 757 //Air 2 (cutting the lower part of the box)
 758   par[0]=1.25;    par[1] = 3;    par[2] = 70.86;   gMC->Gsvolu("AIR2", "BOX ", idtmed[1000], par, 3);
 759 //Air 3 (cutting the lower part of the box)
 760   par[0]=66.3;    par[1] = 3;  par[2] = 1.2505;    gMC->Gsvolu("AIR3", "BOX ", idtmed[1000], par, 3);
 761 //Honeycomb
 762   par[0]=66.3;par[1]=0.188;  par[2] = 68.35;       gMC->Gsvolu("HONE", "BOX ", idtmed[1001], par, 3);
 763 //Aluminium sheet
 764   par[0]=66.3;par[1]=0.025;par[2]=68.35;           gMC->Gsvolu("ALUM", "BOX ", idtmed[1009], par, 3);
 765   //par[0] = 66.5; par[1] = .025; par[2] = 63.1;
 766 //Quartz
 767   par[0]=Param()->QuartzWidth()/2;par[1]=Param()->QuartzThickness()/2;par[2]=Param()->QuartzLength()/2;
 768   gMC->Gsvolu("QUAR", "BOX ", idtmed[1002], par, 3);
 769 //Spacers (cylinders)
 770   par[0]=0.;par[1]=.5;par[2]=Param()->FreonThickness()/2;  gMC->Gsvolu("SPAC", "TUBE", idtmed[1002], par, 3);
 771 //Feet (freon slabs supports)
 772   par[0] = .7;  par[1] = .3;  par[2] = 1.9;        gMC->Gsvolu("FOOT", "BOX", idtmed[1009], par, 3);
 773 //Opaque quartz
 774   par[0]=Param()->QuartzWidth()/2;par[1]= .2;par[2]=Param()->QuartzLength()/2;
 775   gMC->Gsvolu("OQUA", "BOX ", idtmed[1007], par, 3);
 776 //Frame of opaque quartz
 777   par[0]=Param()->OuterFreonWidth()/2;par[1]=Param()->FreonThickness()/2;par[2]=Param()->OuterFreonLength()/2;
 778   gMC->Gsvolu("OQF1", "BOX ", idtmed[1007], par, 3);
 779   par[0]=Param()->InnerFreonWidth()/2;par[1]=Param()->FreonThickness()/2;par[2]=Param()->InnerFreonLength()/2;
 780   gMC->Gsvolu("OQF2", "BOX ", idtmed[1007], par, 3);
 781 //Freon
 782   par[0]=Param()->OuterFreonWidth()/2 - oqua_thickness;
 783   par[1]=Param()->FreonThickness()/2;
 784   par[2]=Param()->OuterFreonLength()/2 - 2*oqua_thickness;
 785   gMC->Gsvolu("FRE1", "BOX ", idtmed[1003], par, 3);
 786
 787   par[0]=Param()->InnerFreonWidth()/2 - oqua_thickness;
 788   par[1]=Param()->FreonThickness()/2;
 789   par[2]=Param()->InnerFreonLength()/2 - 2*oqua_thickness;
 790   gMC->Gsvolu("FRE2", "BOX ", idtmed[1003], par, 3);
 791 //Methane
 792   par[0]=pcX/2;par[1]=Param()->GapThickness()/2;par[2]=pcY/2;         gMC->Gsvolu("META","BOX ",idtmed[1004], par, 3);
 793 //Methane gap
 794   par[0]=pcX/2;par[1]=Param()->ProximityGapThickness()/2;par[2]=pcY/2;gMC->Gsvolu("GAP ","BOX ",(*fIdtmed)[kGAP],par,3);
 795 //CsI PC
 796   par[0]=pcX/2;par[1]=.25;par[2]=pcY/2;  gMC->Gsvolu("CSI ", "BOX ", (*fIdtmed)[kCSI], par, 3);
 797 //Anode grid
 798   par[0] = 0.;par[1] = .001;par[2] = 20.;  gMC->Gsvolu("GRID", "TUBE", idtmed[1006], par, 3);
 799
 800 //Wire supports
 801 //Bar of metal
 802   par[0]=pcX/2;par[1]=1.05;par[2]=1.05;  gMC->Gsvolu("WSMe", "BOX ", idtmed[1009], par, 3);
 803 //Ceramic pick up (base)
 804   par[0]=pcX/2;par[1]= .25;par[2]=1.05;  gMC->Gsvolu("WSG1", "BOX ", idtmed[1010], par, 3);
 805 //Ceramic pick up (head)
 806   par[0] = pcX/2;par[1] = .1;par[2] = .1;  gMC->Gsvolu("WSG2", "BOX ", idtmed[1010], par, 3);
 807
 808 //Aluminium supports for methane and CsI
 809 //Short bar
 810   par[0]=pcX/2;par[1]=Param()->GapThickness()/2 + .25; par[2] = (68.35 - pcY/2)/2;
 811   gMC->Gsvolu("SMSH", "BOX", idtmed[1009], par, 3);
 812 //Long bar
 813   par[0]=(66.3 - pcX/2)/2;par[1]=Param()->GapThickness()/2+.25;par[2]=pcY/2+68.35-pcY/2;
 814   gMC->Gsvolu("SMLG", "BOX", idtmed[1009], par, 3);
 815
 816 //Aluminium supports for freon
 817 //Short bar
 818   par[0] = Param()->QuartzWidth()/2; par[1] = .3; par[2] = (68.35 - Param()->QuartzLength()/2)/2;
 819   gMC->Gsvolu("SFSH", "BOX", idtmed[1009], par, 3);
 820 //Long bar
 821   par[0] = (66.3 - Param()->QuartzWidth()/2)/2; par[1] = .3;
 822   par[2] = Param()->QuartzLength()/2 + 68.35 - Param()->QuartzLength()/2;
 823   gMC->Gsvolu("SFLG", "BOX", idtmed[1009], par, 3);
 824 //PCB backplane
 825   par[0] = pcX/2;par[1] = .25; par[2] = pcY/4 -.5025;  gMC->Gsvolu("PCB ", "BOX", idtmed[1011], par, 3);
 826
 827 //Backplane supports
 828 //Aluminium slab
 829   par[0] = 33.15;par[1] = 2;par[2] = 21.65;  gMC->Gsvolu("BACK", "BOX", idtmed[1009], par, 3);
 830 //Big hole
 831   par[0] = 9.05; par[1] = 2; par[2] = 4.4625;  gMC->Gsvolu("BKHL", "BOX", idtmed[1000], par, 3);
 832 //Small hole
 833   par[0] = 5.7;par[1] = 2;par[2] = 4.4625;  gMC->Gsvolu("BKHS", "BOX", idtmed[1000], par, 3);
 834 //Place holes inside backplane support
 835   gMC->Gspos("BKHS", 1, "BACK", .8 + 5.7,0., .6 + 4.4625, 0, "ONLY");
 836   gMC->Gspos("BKHS", 2, "BACK", -.8 - 5.7,0., .6 + 4.4625, 0, "ONLY");
 837   gMC->Gspos("BKHS", 3, "BACK", .8 + 5.7,0., -.6 - 4.4625, 0, "ONLY");
 838   gMC->Gspos("BKHS", 4, "BACK", -.8 - 5.7,0., -.6 - 4.4625, 0, "ONLY");
 839   gMC->Gspos("BKHS", 5, "BACK", .8 + 5.7,0., .6 + 8.925 + 1.2 + 4.4625, 0, "ONLY");
 840   gMC->Gspos("BKHS", 6, "BACK", -.8 - 5.7,0., .6 + 8.925 + 1.2 + 4.4625, 0, "ONLY");
 841   gMC->Gspos("BKHS", 7, "BACK", .8 + 5.7,0., -.6 - 8.925 - 1.2 - 4.4625, 0, "ONLY");
 842   gMC->Gspos("BKHS", 8, "BACK", -.8 - 5.7,0., -.6 - 8.925 - 1.2 - 4.4625, 0, "ONLY");
 843   gMC->Gspos("BKHL", 1, "BACK", .8 + 11.4 + 1.6 + 9.05, 0., .6 + 4.4625, 0, "ONLY");
 844   gMC->Gspos("BKHL", 2, "BACK", -.8 - 11.4 - 1.6 - 9.05, 0., .6 + 4.4625, 0, "ONLY");
 845   gMC->Gspos("BKHL", 3, "BACK", .8 + 11.4 + 1.6 + 9.05, 0., -.6 - 4.4625, 0, "ONLY");
 846   gMC->Gspos("BKHL", 4, "BACK", -.8 - 11.4 - 1.6 - 9.05, 0., -.6 - 4.4625, 0, "ONLY");
 847   gMC->Gspos("BKHL", 5, "BACK", .8 + 11.4+ 1.6 + 9.05, 0., .6 + 8.925 + 1.2 + 4.4625, 0, "ONLY");
 848   gMC->Gspos("BKHL", 6, "BACK", -.8 - 11.4 - 1.6 - 9.05, 0., .6 + 8.925 + 1.2 + 4.4625, 0, "ONLY");
 849   gMC->Gspos("BKHL", 7, "BACK", .8 + 11.4 + 1.6 + 9.05, 0., -.6 - 8.925 - 1.2 - 4.4625, 0, "ONLY");
 850   gMC->Gspos("BKHL", 8, "BACK", -.8 - 11.4 - 1.6 - 9.05, 0., -.6 - 8.925 - 1.2 - 4.4625, 0, "ONLY");
 851 //Place material inside RICH
 852   gMC->Gspos("SRIC", 1, "RICH", 0.,0., 0., 0, "ONLY");
 853   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");
 854   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");
 855   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");
 856   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");
 857   gMC->Gspos("ALUM", 1, "SRIC", 0., 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .6 - .05 - .376 -.025, 0., 0, "ONLY");
 858   gMC->Gspos("HONE", 1, "SRIC", 0., 1.276- Param()->GapThickness()/2  - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .6 - .05 - .188, 0., 0, "ONLY");
 859   gMC->Gspos("ALUM", 2, "SRIC", 0., 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .6 - .025, 0., 0, "ONLY");
 860   gMC->Gspos("FOOT", 1, "SRIC", 64.95, 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .3, 36.9, 0, "ONLY");
 861   gMC->Gspos("FOOT", 2, "SRIC", 21.65, 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .3 , 36.9, 0, "ONLY");
 862   gMC->Gspos("FOOT", 3, "SRIC", -21.65, 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .3, 36.9, 0, "ONLY");
 863   gMC->Gspos("FOOT", 4, "SRIC", -64.95, 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .3, 36.9, 0, "ONLY");
 864   gMC->Gspos("FOOT", 5, "SRIC", 64.95, 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .3, -36.9, 0, "ONLY");
 865   gMC->Gspos("FOOT", 6, "SRIC", 21.65, 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .3, -36.9, 0, "ONLY");
 866   gMC->Gspos("FOOT", 7, "SRIC", -21.65, 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .3, -36.9, 0, "ONLY");
 867   gMC->Gspos("FOOT", 8, "SRIC", -64.95, 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .3, -36.9, 0, "ONLY");
 868   gMC->Gspos("OQUA", 1, "SRIC", 0., 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .2, 0., 0, "ONLY");
 869 // Methane supports
 870   gMC->Gspos("SMLG", 1, "SRIC", pcX/2 + (66.3 - pcX/2)/2, 1.276 + .25, 0., 0, "ONLY");
 871   gMC->Gspos("SMLG", 2, "SRIC", - pcX/2 - (66.3 - pcX/2)/2, 1.276 + .25, 0., 0, "ONLY");
 872   gMC->Gspos("SMSH", 1, "SRIC", 0., 1.276 + .25, pcY/2 + (68.35 - pcY/2)/2, 0, "ONLY");
 873   gMC->Gspos("SMSH", 2, "SRIC", 0., 1.276 + .25, - pcY/2 - (68.35 - pcY/2)/2, 0, "ONLY");
 874 //Freon supports
 875   Float_t supp_y = 1.276 - Param()->GapThickness()/2- Param()->QuartzThickness() -Param()->FreonThickness() - .2 + .3; //y position of freon supports
 876   gMC->Gspos("SFLG", 1, "SRIC", Param()->QuartzWidth()/2 + (66.3 - Param()->QuartzWidth()/2)/2, supp_y, 0., 0, "ONLY");
 877   gMC->Gspos("SFLG", 2, "SRIC", - Param()->QuartzWidth()/2 - (66.3 - Param()->QuartzWidth()/2)/2, supp_y, 0., 0, "ONLY");
 878   gMC->Gspos("SFSH", 1, "SRIC", 0., supp_y, Param()->QuartzLength()/2 + (68.35 - Param()->QuartzLength()/2)/2, 0, "ONLY");
 879   gMC->Gspos("SFSH", 2, "SRIC", 0., supp_y, - Param()->QuartzLength()/2 - (68.35 - Param()->QuartzLength()/2)/2, 0, "ONLY");
 880   AliMatrix(idrotm[1019], 0., 0., 90., 0., 90., 90.);
 881 //Place spacers
 882   Int_t nspacers = 30;
 883   for (i = 0; i < nspacers/3; i++) {
 884     zs = -11.6/2 + (TMath::Abs(nspacers/6) - i) * 12.2;
 885     gMC->Gspos("SPAC", i, "FRE1", 10.5, 0., zs, idrotm[1019], "ONLY");  //Original settings
 886   }
 887   for (i = nspacers/3; i < (nspacers*2)/3; i++) {
 888     zs = -11.6/2 + (nspacers/3 + TMath::Abs(nspacers/6) - i) * 12.2;
 889     gMC->Gspos("SPAC", i, "FRE1", 0, 0., zs, idrotm[1019], "ONLY");  //Original settings
 890   }
 891   for (i = (nspacers*2)/3; i < nspacers; ++i) {
 892     zs = -11.6/2 + ((nspacers*2)/3 + TMath::Abs(nspacers/6) - i) * 12.2;
 893     gMC->Gspos("SPAC", i, "FRE1", -10.5, 0., zs, idrotm[1019], "ONLY"); //Original settings
 894   }
 895   for (i = 0; i < nspacers/3; i++) {
 896     zs = -11.6/2 + (TMath::Abs(nspacers/6) - i) * 12.2;
 897     gMC->Gspos("SPAC", i, "FRE2", 10.5, 0., zs, idrotm[1019], "ONLY");  //Original settings
 898   }
 899   for (i = nspacers/3; i < (nspacers*2)/3; i++) {
 900     zs = -11.6/2 + (nspacers/3 + TMath::Abs(nspacers/6) - i) * 12.2;
 901     gMC->Gspos("SPAC", i, "FRE2", 0, 0., zs, idrotm[1019], "ONLY");  //Original settings
 902   }
 903   for (i = (nspacers*2)/3; i < nspacers; ++i) {
 904     zs = -11.6/2 + ((nspacers*2)/3 + TMath::Abs(nspacers/6) - i) * 12.2;
 905     gMC->Gspos("SPAC", i, "FRE2", -10.5, 0., zs, idrotm[1019], "ONLY"); //Original settings
 906   }
 907   gMC->Gspos("FRE1", 1, "OQF1", 0., 0., 0., 0, "ONLY");
 908   gMC->Gspos("FRE2", 1, "OQF2", 0., 0., 0., 0, "ONLY");
 909   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)
 910   gMC->Gspos("OQF2", 2, "SRIC", 0., 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()/2, 0., 0, "ONLY");          //Original settings
 911   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)
 912   gMC->Gspos("QUAR", 1, "SRIC", 0., 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness()/2, 0., 0, "ONLY");
 913   gMC->Gspos("GAP ", 1, "META", 0., Param()->GapThickness()/2 - Param()->ProximityGapThickness()/2 - 0.0001, 0., 0, "ONLY");
 914   gMC->Gspos("META", 1, "SRIC", 0., 1.276, 0., 0, "ONLY");
 915   gMC->Gspos("CSI ", 1, "SRIC", 0., 1.276 + Param()->GapThickness()/2 + .25, 0., 0, "ONLY");
 916 //Wire support placing
 917   gMC->Gspos("WSG2", 1, "GAP ", 0., Param()->ProximityGapThickness()/2 - .1, 0., 0, "ONLY");
 918   gMC->Gspos("WSG1", 1, "CSI ", 0., 0., 0., 0, "ONLY");
 919   gMC->Gspos("WSMe", 1, "SRIC ", 0., 1.276 + Param()->GapThickness()/2 + .5 + 1.05, 0., 0, "ONLY");
 920 //Backplane placing
 921   gMC->Gspos("BACK", 1, "SRIC ", -33.15, 1.276 + Param()->GapThickness()/2 + .5 + 2.1 + 2, 43.3, 0, "ONLY");
 922   gMC->Gspos("BACK", 2, "SRIC ", 33.15, 1.276 + Param()->GapThickness()/2 + .5 + 2.1 + 2 , 43.3, 0, "ONLY");
 923   gMC->Gspos("BACK", 3, "SRIC ", -33.15, 1.276 + Param()->GapThickness()/2 + .5 + 2.1 + 2, 0., 0, "ONLY");
 924   gMC->Gspos("BACK", 4, "SRIC ", 33.15, 1.276 + Param()->GapThickness()/2 + .5 + 2.1 + 2, 0., 0, "ONLY");
 925   gMC->Gspos("BACK", 5, "SRIC ", 33.15, 1.276 + Param()->GapThickness()/2 + .5 + 2.1 + 2, -43.3, 0, "ONLY");
 926   gMC->Gspos("BACK", 6, "SRIC ", -33.15, 1.276 + Param()->GapThickness()/2 + .5 + 2.1 + 2, -43.3, 0, "ONLY");
 927 //PCB placing
 928   gMC->Gspos("PCB ", 1, "SRIC ", 0.,  1.276 + Param()->GapThickness()/2 + .5 + 1.05, pcX/4 + .5025 + 2.5, 0, "ONLY");
 929   gMC->Gspos("PCB ", 2, "SRIC ", 0.,  1.276 + Param()->GapThickness()/2 + .5 + 1.05, -pcX/4 - .5025 - 2.5, 0, "ONLY");
 930
 931 //place chambers into mother volume ALIC
 932   CreateChambers();
 933   for(int i=1;i<=kNCH;i++){
 934     AliMatrix(idrotm[1000+i],C(i)->ThetaXd(),C(i)->PhiXd(),
 935                              C(i)->ThetaYd(),C(i)->PhiYd(),
 936                              C(i)->ThetaZd(),C(i)->PhiZd());
 937     gMC->Gspos("RICH",i,"ALIC",C(i)->X(),C(i)->Y(),C(i)->Z(),idrotm[1000+i], "ONLY");
 938   }
 939
 940   if(GetDebug())Info("CreateGeometry","Stop.");
 941 }//void AliRICH::CreateGeometry()
 942 //__________________________________________________________________________________________________
 943 void AliRICH::CreateChambers()
 944 {//create all RICH Chambers on each call. Previous chambers deleted
 945   if(fChambers) delete fChambers;
 946   if(GetDebug())Info("CreateChambers","Creating RICH chambers.");
 947   fChambers=new TObjArray(kNCH);
 948   fChambers->SetOwner();
 949   for(int i=0;i<kNCH;i++)  fChambers->AddAt(new AliRICHChamber(i+1,Param()),i);
 950 }//void AliRICH::CreateChambers()
 951 //__________________________________________________________________________________________________
 952 void AliRICH::GenerateFeedbacks(Int_t iChamber,Float_t eloss)
 953 {// Generate FeedBack photons
 954   Int_t j;
 955   Float_t cthf, phif, enfp = 0, sthf;
 956   Float_t e1[3], e2[3], e3[3];
 957   Float_t vmod, uswop;
 958   Float_t dir[3], phi;
 959   Float_t pol[3], mom[4];
 960 //Determine number of feedback photons
 961   TLorentzVector x4;
 962   gMC->TrackPosition(x4);
 963   Float_t charge=Param()->TotalCharge(gMC->TrackPid(),eloss,C(iChamber)->G2Ly(x4));//Total Charge
 964   Int_t iNphotons=gMC->GetRandom()->Poisson(Param()->AlphaFeedback()*charge);
 965   Info("GenerateFeedbacks","N photons=%i",iNphotons);
 966 //Generate photons
 967   for(Int_t i=0;i<iNphotons;i++){
 968     Double_t ranf[2];
 969     gMC->GetRandom()->RndmArray(2,ranf);    //Sample direction
 970     cthf=ranf[0]*2-1.0;
 971     if(cthf<0) continue;
 972     sthf = TMath::Sqrt((1 - cthf) * (1 + cthf));
 973     phif = ranf[1] * 2 * TMath::Pi();
 974
 975     if(Double_t randomNumber=gMC->GetRandom()->Rndm()<=0.57)
 976       enfp = 7.5e-9;
 977     else if(randomNumber<=0.7)
 978       enfp = 6.4e-9;
 979     else
 980       enfp = 7.9e-9;
 981
 982
 983     dir[0] = sthf * TMath::Sin(phif);    dir[1] = cthf;    dir[2] = sthf * TMath::Cos(phif);
 984     gMC->Gdtom(dir, mom, 2);
 985     mom[0]*=enfp;    mom[1]*=enfp;    mom[2]*=enfp;
 986     mom[3] = TMath::Sqrt(mom[0]*mom[0]+mom[1]*mom[1]+mom[2]*mom[2]);
 987
 988     // Polarisation
 989     e1[0]=      0;    e1[1]=-dir[2];    e1[2]= dir[1];
 990     e2[0]=-dir[1];    e2[1]= dir[0];    e2[2]=      0;
 991     e3[0]= dir[1];    e3[1]=      0;    e3[2]=-dir[0];
 992
 993     vmod=0;
 994     for(j=0;j<3;j++) vmod+=e1[j]*e1[j];
 995     if (!vmod) for(j=0;j<3;j++) {
 996       uswop=e1[j];
 997       e1[j]=e3[j];
 998       e3[j]=uswop;
 999     }
1000     vmod=0;
1001     for(j=0;j<3;j++) vmod+=e2[j]*e2[j];
1002     if (!vmod) for(j=0;j<3;j++) {
1003       uswop=e2[j];
1004       e2[j]=e3[j];
1005       e3[j]=uswop;
1006     }
1007
1008     vmod=0;
1009     for(j=0;j<3;j++) vmod+=e1[j]*e1[j];
1010     vmod=TMath::Sqrt(1/vmod);
1011     for(j=0;j<3;j++) e1[j]*=vmod;
1012
1013     vmod=0;
1014     for(j=0;j<3;j++) vmod+=e2[j]*e2[j];
1015     vmod=TMath::Sqrt(1/vmod);
1016     for(j=0;j<3;j++) e2[j]*=vmod;
1017
1018     phi = gMC->GetRandom()->Rndm()* 2 * TMath::Pi();
1019     for(j=0;j<3;j++) pol[j]=e1[j]*TMath::Sin(phi)+e2[j]*TMath::Cos(phi);
1020     gMC->Gdtom(pol, pol, 2);
1021     Int_t outputNtracksStored;
1022     gAlice->PushTrack(1,                             //do not transport
1023                      gAlice->GetCurrentTrackNumber(),//parent track
1024                      kFeedback,                      //PID
1025                      mom[0],mom[1],mom[2],mom[3],    //track momentum
1026                      x4.X(),x4.Y(),x4.Z(),x4.T(),    //track origin
1027                      pol[0],pol[1],pol[2],           //polarization
1028                      kPFeedBackPhoton,outputNtracksStored,1.0);
1029
1030   }
1031 }//Int_t AliRICH::FeedBackPhotons()
1032 //__________________________________________________________________________________________________