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 <TBRIK.h>
  18 #include <TFile.h>
  19 #include <TGeometry.h>
  20 #include <TNode.h>
  21 #include <TObjArray.h>
  22 #include <TObject.h>
  23 #include <TParticle.h>
  24 #include <TPDGCode.h>
  25 #include <TRandom.h>
  26 #include <TTUBE.h>
  27 #include <TTree.h>
  28 #include <TVector.h>
  29 #include <AliMagF.h>
  30 #include <AliPoints.h>
  31 #include "AliRICH.h"
  32 #include "AliRICHParam.h"
  33 #include "AliRICHClusterFinder.h"
  34 #include "AliRICHRawCluster.h"
  35 #include "AliRICHRecHit1D.h"
  36 #include "AliRICHRecHit3D.h"
  37 #include "AliRICHSegmentationV0.h"
  38 #include "AliRICHTransientDigit.h"
  39 #include <AliRun.h>
  40 #include <AliRunDigitizer.h>
  41 #include "AliRICHSegmentationV1.h"
  42 #include "AliRICHResponseV0.h"
  43
  44 ClassImp(AliRICHhit)
  45 //__________________________________________________________________________________________________
  46 void AliRICHhit::Print(Option_t*)const
  47 {
  48   Info("","chamber=%2i, PID=%9i, TID=%6i, eloss=%9.3f eV",fChamber,fPid,fTrack,fEloss*1e9);
  49 }//void AliRICHdigit::Print(Option_t *option)const
  50 //__________________________________________________________________________________________________
  51 ClassImp(AliRICHdigit)
  52 //__________________________________________________________________________________________________
  53 void AliRICHdigit::Print(Option_t*)const
  54 {
  55   Info("","ID=%6i, chamber=%2i, PadX=%3i, PadY=%3i, Qdc=%4i, TID1=%5i, TID2=%5i, TID3=%5i",
  56          Id(),fChamber,fPadX,fPadY,fQdc,fTracks[0],fTracks[1],fTracks[2]);
  57 }//void AliRICHdigit::Print(Option_t *option)const
  58 //__________________________________________________________________________________________________
  59
  60 ClassImp(AliRICH)
  61 //__________________________________________________________________________________________________
  62 // RICH manager class
  63 //BEGIN_HTML
  64 /*
  65   <img src="gif/alirich.gif">
  66 */
  67 //END_HTML
  68 //__________________________________________________________________________________________________
  69 AliRICH::AliRICH()
  70         :AliDetector()
  71 {//Default ctor should not contain any new operators
  72   fpParam     =0;
  73   fChambers   =0;
  74
  75
  76         //AliDetector ctor deals with Hits and Digits
  77
  78   fSdigits    =0; fNsdigits   =0;
  79   fDigitsNew  =0; for(int i=0;i<kNCH;i++) fNdigitsNew[i]  =0;
  80   fClusters   =0; for(int i=0;i<kNCH;i++) fNclusters[i]=0;
  81
  82   fCerenkovs  =0; fNcerenkovs =0;
  83   fSpecials   =0; fNspecials  =0;
  84   fDchambers  =0; for(int i=0;i<kNCH;i++) fNdch[i]=0;
  85   fRecHits1D  =0; for(int i=0;i<kNCH;i++) fNrechits1D[i]=0;
  86   fRecHits3D  =0; for(int i=0;i<kNCH;i++) fNrechits3D[i]=0;
  87   fRawClusters=0; for(int i=0;i<kNCH;i++) fNrawch[i]=0;
  88 }//AliRICH::AliRICH()
  89 //__________________________________________________________________________________________________
  90 AliRICH::AliRICH(const char *name, const char *title)
  91         :AliDetector(name,title)
  92 {//Named ctor
  93   if(GetDebug())Info("named ctor","Start.");
  94   fpParam     =   new AliRICHParam;
  95   fChambers = 0;  CreateChambers();
  96
  97         //AliDetector ctor deals with Hits and Digits (reset them to 0, does not create them)
  98   fHits=       0;     CreateHits();          gAlice->AddHitList(fHits);
  99   fSdigits=    0;
 100   fDigitsNew=  0;
 101   fClusters=   0;
 102
 103   fCerenkovs=  0;     CreateCerenkovsOld();  gAlice->AddHitList(fCerenkovs);
 104   fSpecials=   0;     CreateSpecialsOld();
 105   fDchambers=  0;   //CreateDigitsOld();
 106   fRawClusters=0;   //CreateRawClustersOld();
 107   fRecHits1D=  0;   //CreateRecos1Old();
 108   fRecHits3D=  0;   //CreateRecos3Old();
 109
 110   fCkovNumber=fFreonProd=0;
 111   if(GetDebug())Info("named ctor","Stop.");
 112 }//AliRICH::AliRICH(const char *name, const char *title)
 113 //__________________________________________________________________________________________________
 114 AliRICH::~AliRICH()
 115 {//dtor
 116   if(GetDebug()) Info("dtor","Start.");
 117
 118   if(fpParam)    delete fpParam;
 119   if(fChambers)  delete fChambers;
 120
 121   if(fHits)      delete fHits;
 122   if(fSdigits)   delete fSdigits;
 123   if(fDigits)    delete fDigits;
 124   if(fDigitsNew) {fDigitsNew->Delete();   delete fDigitsNew;}
 125   if(fClusters)  {fClusters->Delete();    delete fClusters;}
 126
 127   if(fCerenkovs) delete fCerenkovs;
 128   if(fSpecials)  delete fSpecials;
 129   if(fDchambers)   {fDchambers->Delete();     delete fDchambers;}
 130   if(fRawClusters) {fRawClusters->Delete();   delete fRawClusters;}
 131   if(fRecHits1D) {fRecHits1D->Delete();       delete fRecHits1D;}
 132   if(fRecHits3D) {fRecHits3D->Delete();       delete fRecHits3D;}
 133   if(GetDebug()) Info("dtor","Stop.");
 134 }//AliRICH::~AliRICH()
 135 //__________________________________________________________________________________________________
 136 void AliRICH::Hits2SDigits()
 137 {//Create a list of sdigits corresponding to list of hits. Every hit generates one or more sdigits.
 138   if(GetDebug()) Info("Hit2SDigits","Start.");
 139
 140   if(GetDebug()) Info("Hit2SDigits","Stop.");
 141 }//void AliRICH::Hits2SDigits()
 142 //__________________________________________________________________________________________________
 143 void AliRICH::SDigits2Digits()
 144 {//Generate digits from sdigits.
 145   if(GetDebug()) Info("SDigits2Digits","Start.");
 146
 147   if(GetDebug()) Info("SDigits2Digits","Stop.");
 148 }//void AliRICH::SDigits2Digits()
 149 //__________________________________________________________________________________________________
 150 void AliRICH::Digits2Reco()
 151 {//Generate clusters from digits then generate recos from clusters or digits
 152   if(GetDebug()) Info("Digits2reco","Start.");
 153
 154 }//void AliRICH::Digits2Reco()
 155 //__________________________________________________________________________________________________
 156 void AliRICH::AddRawCluster(Int_t id, const AliRICHRawCluster& c)
 157 {// Add a RICH digit to the list
 158
 159     TClonesArray &lrawcl = *((TClonesArray*)fRawClusters->At(id));
 160     new(lrawcl[fNrawch[id]++]) AliRICHRawCluster(c);
 161 }
 162 //_____________________________________________________________________________
 163 void AliRICH::AddRecHit1D(Int_t id, Float_t *rechit, Float_t *photons, Int_t *padsx, Int_t* padsy)
 164 {// Add a RICH reconstructed hit to the list
 165
 166     TClonesArray &lrec1D = *((TClonesArray*)fRecHits1D->At(id));
 167     new(lrec1D[fNrechits1D[id]++]) AliRICHRecHit1D(id,rechit,photons,padsx,padsy);
 168 }
 169 //_____________________________________________________________________________
 170 void AliRICH::AddRecHit3D(Int_t id, Float_t *rechit, Float_t omega, Float_t theta, Float_t phi)
 171 {// Add a RICH reconstructed hit to the list
 172
 173     TClonesArray &lrec3D = *((TClonesArray*)fRecHits3D->At(id));
 174     new(lrec3D[fNrechits3D[id]++]) AliRICHRecHit3D(id,rechit,omega,theta,phi);
 175 }
 176 //______________________________________________________________________________
 177 void AliRICH::BuildGeometry()
 178 {//Builds a TNode geometry for event display
 179   if(GetDebug())Info("BuildGeometry","Start.");
 180
 181   TNode *node, *subnode, *top;
 182   top=gAlice->GetGeometry()->GetNode("alice");
 183
 184   new TBRIK("S_RICH","S_RICH","void",71.09999,11.5,73.15);
 185
 186   Float_t wid=Param()->SectorSizeX();
 187   Float_t len=Param()->SectorSizeY();
 188   new TBRIK("PHOTO","PHOTO","void",wid/2,0.1,len/2);
 189
 190   for(int i=1;i<=kNCH;i++){
 191     top->cd();
 192     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());
 193     node->SetLineColor(kRed);
 194     node->cd();
 195     subnode = new TNode("PHOTO1","PHOTO1","PHOTO",wid+Param()->DeadZone(),5,len/2+Param()->DeadZone()/2,"");
 196     subnode->SetLineColor(kGreen);
 197     fNodes->Add(subnode);
 198     subnode = new TNode("PHOTO1","PHOTO1","PHOTO",0,5,len/2+Param()->DeadZone()/2,"");
 199     subnode->SetLineColor(kGreen);
 200     fNodes->Add(subnode);
 201     subnode = new TNode("PHOTO1","PHOTO1","PHOTO",-wid-Param()->DeadZone(),5,len/2+Param()->DeadZone()/2,"");
 202     subnode->SetLineColor(kGreen);
 203     fNodes->Add(subnode);
 204     subnode = new TNode("PHOTO1","PHOTO1","PHOTO",wid+Param()->DeadZone(),5,-len/2-Param()->DeadZone()/2,"");
 205     subnode->SetLineColor(kGreen);
 206     fNodes->Add(subnode);
 207     subnode = new TNode("PHOTO1","PHOTO1","PHOTO",0,5,-len/2 -Param()->DeadZone()/2,"");
 208     subnode->SetLineColor(kGreen);
 209     fNodes->Add(subnode);
 210     subnode = new TNode("PHOTO1","PHOTO1","PHOTO",-wid-Param()->DeadZone(),5,-len/2 - Param()->DeadZone()/2,"");
 211     subnode->SetLineColor(kGreen);
 212     fNodes->Add(subnode);
 213     fNodes->Add(node);
 214   }
 215   if(GetDebug())Info("BuildGeometry","Stop.");
 216 }//void AliRICH::BuildGeometry()
 217
 218 static Int_t kCSI=6;
 219 static Int_t kGAP=9;
 220 //______________________________________________________________________________
 221 void AliRICH::CreateMaterials()
 222 {
 223     //
 224     // *** DEFINITION OF AVAILABLE RICH MATERIALS ***
 225     // ORIGIN    : NICK VAN EIJNDHOVEN
 226     // Modified by:  N. Colonna (INFN - BARI, Nicola.Colonna@ba.infn.it)
 227     //               R.A. Fini  (INFN - BARI, Rosanna.Fini@ba.infn.it)
 228     //               R.A. Loconsole (Bari University, loco@riscom.ba.infn.it)
 229     //
 230     Int_t i;
 231
 232     //Photons energy intervals
 233     Float_t ppckov[26];
 234     for (i=0;i<26;i++)
 235     {
 236         ppckov[i] = (Float_t(i)*0.1+5.5)*1e-9;
 237     }
 238
 239
 240     //Refraction index for quarz
 241     Float_t rIndexQuarz[26];
 242     Float_t  e1= 10.666;
 243     Float_t  e2= 18.125;
 244     Float_t  f1= 46.411;
 245     Float_t  f2= 228.71;
 246     for (i=0;i<26;i++)
 247     {
 248         Float_t ene=ppckov[i]*1e9;
 249         Float_t a=f1/(e1*e1 - ene*ene);
 250         Float_t b=f2/(e2*e2 - ene*ene);
 251         rIndexQuarz[i] = TMath::Sqrt(1. + a + b );
 252     }
 253
 254     //Refraction index for opaque quarz, methane and grid
 255     Float_t rIndexOpaqueQuarz[26];
 256     Float_t rIndexMethane[26];
 257     Float_t rIndexGrid[26];
 258     for (i=0;i<26;i++)
 259     {
 260         rIndexOpaqueQuarz[i]=1;
 261         rIndexMethane[i]=1.000444;
 262         rIndexGrid[i]=1;
 263     }
 264
 265     //Absorption index for freon
 266     Float_t abscoFreon[26] = {179.0987, 179.0987, 179.0987, 179.0987, 179.0987,  179.0987, 179.0987, 179.0987,
 267                                179.0987, 142.9206, 56.64957, 25.58622, 13.95293, 12.03905, 10.42953, 8.804196,
 268                                7.069031, 4.461292, 2.028366, 1.293013, .577267,   .40746,  .334964, 0., 0., 0.};
 269
 270
 271     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,
 272                                 19.266, 17.525, 15.878, 14.177, 11.719, 9.282, 6.62, 4.0925, 2.601, 1.149, .667, .3627,
 273                                 .192, .1497, .10857};
 274
 275     //Absorption index for methane
 276     Float_t abscoMethane[26];
 277     for (i=0;i<26;i++)
 278     {
 279         abscoMethane[i]=AbsoCH4(ppckov[i]*1e9);
 280     }
 281
 282     //Absorption index for opaque quarz, csi and grid, efficiency for all and grid
 283     Float_t abscoOpaqueQuarz[26];
 284     Float_t abscoCsI[26];
 285     Float_t abscoGrid[26];
 286     Float_t efficAll[26];
 287     Float_t efficGrid[26];
 288     for (i=0;i<26;i++)
 289     {
 290         abscoOpaqueQuarz[i]=1e-5;
 291         abscoCsI[i]=1e-4;
 292         abscoGrid[i]=1e-4;
 293         efficAll[i]=1;
 294         efficGrid[i]=1;
 295     }
 296
 297     //Efficiency for csi
 298
 299     Float_t efficCsI[26] = {0.000199999995, 0.000600000028, 0.000699999975, 0.00499999989, 0.00749999983, 0.010125,
 300                              0.0242999997, 0.0405000001, 0.0688500032, 0.105299994, 0.121500008, 0.141749993, 0.157949999,
 301                              0.162, 0.166050002, 0.167669997, 0.174299985, 0.176789999, 0.179279998, 0.182599992, 0.18592,
 302                              0.187579989, 0.189239994, 0.190899998, 0.207499996, 0.215799987};
 303
 304
 305
 306     //FRESNEL LOSS CORRECTION FOR PERPENDICULAR INCIDENCE AND
 307     //UNPOLARIZED PHOTONS
 308
 309     for (i=0;i<26;i++)
 310     {
 311         efficCsI[i] = efficCsI[i]/(1.-Fresnel(ppckov[i]*1e9,1.,0));
 312     }
 313
 314     /*******************************************End of rich_media.f***************************************/
 315
 316   Float_t rIndexFreon[26];
 317
 318
 319     // --- Photon energy (GeV)
 320     // --- Refraction indexes
 321     for (i = 0; i < 26; ++i) {
 322       rIndexFreon[i] = ppckov[i] * .0172 * 1e9 + 1.177;
 323       //rIndexFreon[i] = 1;
 324     }
 325
 326
 327   Float_t a=0,z=0,den=0,radl=0,absl=0;
 328   Float_t tmaxfd=-10.0, deemax=-0.2, stemax=-0.1,epsil=0.001, stmin=-0.001;
 329   Int_t   isxfld = gAlice->Field()->Integ();
 330   Float_t sxmgmx = gAlice->Field()->Max();
 331
 332   AliMaterial( 1, "Air     $",a=14.61,z=7.3, den=0.001205,radl=30420.0,absl=67500);//(Air)
 333   AliMedium(1, "DEFAULT MEDIUM AIR$", 1, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 334
 335   AliMaterial( 6, "HON",      a=12.01,z=6.0, den=0.1,     radl=18.8,   absl=0);    //(C)-equivalent radl
 336   AliMedium(2, "HONEYCOMB$", 6, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 337
 338   AliMaterial(16, "CSI",      a=12.01,z=6.0, den=0.1,     radl=18.8,   absl=0);    //CsI-radl equivalent
 339   AliMedium(kCSI, "CSI$", 16, 1, isxfld, sxmgmx,tmaxfd, stemax, deemax, epsil, stmin);
 340
 341   AliMaterial(11, "GRI",      a=63.54,z=29.0,den=8.96,    radl=1.43,   absl=0);    //anode grid (Cu)
 342   AliMedium(7, "GRIGLIA$", 11, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 343
 344   AliMaterial(50, "ALUM",     a=26.98,z=13.0,den=2.7,     radl=8.9,    absl=0);    //aluminium sheet (Al)
 345   AliMedium(10, "ALUMINUM$", 50, 1, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 346
 347   AliMaterial(31, "COPPER$",  a=63.54,z=29.0,den=8.96,    radl=1.4,    absl=0);    //(Cu)
 348   AliMedium(12, "PCB_COPPER", 31, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 349
 350   Float_t  aQuartz[2]={28.09,16.0};  Float_t  zQuartz[2]={14.00, 8.0};  Float_t  wmatQuartz[2]={1,2};
 351   AliMixture (20, "QUA",aQuartz,zQuartz,den=2.64,-2, wmatQuartz);//Quarz (SiO2) - trasnparent
 352   AliMedium(3, "QUARZO$", 20, 1, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 353
 354   AliMixture (21, "QUAO",aQuartz, zQuartz, den=2.64, -2, wmatQuartz);//Quarz (SiO2) - opaque
 355   AliMedium(8, "QUARZOO$", 21, 1, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 356
 357   Float_t  aFreon[2]={12,19};  Float_t  zFreon[2]={6,9};  Float_t wmatFreon[2]={6,14};
 358   AliMixture (30, "FRE",aFreon,zFreon,den=1.7,-2,wmatFreon);//Freon (C6F14)
 359   AliMedium(4, "FREON$", 30, 1, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 360
 361   Float_t aMethane[2]={12.01,1}; Float_t zMethane[2]={6,1}; Float_t wmatMethane[2]={1,4};
 362   AliMixture (40, "MET", aMethane, zMethane, den=7.17e-4,-2, wmatMethane);//methane (CH4)
 363   AliMedium(5, "METANO$", 40, 1, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 364
 365   AliMixture (41, "METG", aMethane, zMethane, den=7.17e-4, -2, wmatMethane);
 366   AliMedium(kGAP, "GAP$", 41, 1, isxfld, sxmgmx,tmaxfd, 0.1, -deemax, epsil, -stmin);
 367
 368   Float_t aGlass[5]={12.01, 28.09, 16.,   10.8,  23.};
 369   Float_t zGlass[5]={ 6.,   14.,    8.,    5.,   11.};
 370   Float_t wGlass[5]={ 0.5,  0.105, 0.355, 0.03,  0.01};
 371   AliMixture (32, "GLASS",aGlass, zGlass, den=1.74, 5, wGlass);//Glass 50%C+10.5%Si+35.5%O+3% + 1%
 372   AliMedium(11, "GLASS", 32, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
 373
 374   Int_t *idtmed = fIdtmed->GetArray()-999;
 375   gMC->SetCerenkov(idtmed[1000], 26, ppckov, abscoMethane,     efficAll,  rIndexMethane);
 376   gMC->SetCerenkov(idtmed[1001], 26, ppckov, abscoMethane,     efficAll,  rIndexMethane);
 377   gMC->SetCerenkov(idtmed[1002], 26, ppckov, abscoQuarz,       efficAll,  rIndexQuarz);
 378   gMC->SetCerenkov(idtmed[1003], 26, ppckov, abscoFreon,       efficAll,  rIndexFreon);
 379   gMC->SetCerenkov(idtmed[1004], 26, ppckov, abscoMethane,     efficAll,  rIndexMethane);
 380   gMC->SetCerenkov(idtmed[1005], 26, ppckov, abscoCsI,         efficCsI,  rIndexMethane);
 381   gMC->SetCerenkov(idtmed[1006], 26, ppckov, abscoGrid,        efficGrid, rIndexGrid);
 382   gMC->SetCerenkov(idtmed[1007], 26, ppckov, abscoOpaqueQuarz, efficAll,  rIndexOpaqueQuarz);
 383   gMC->SetCerenkov(idtmed[1008], 26, ppckov, abscoMethane,     efficAll,  rIndexMethane);
 384   gMC->SetCerenkov(idtmed[1009], 26, ppckov, abscoGrid,        efficGrid, rIndexGrid);
 385   gMC->SetCerenkov(idtmed[1010], 26, ppckov, abscoOpaqueQuarz, efficAll,  rIndexOpaqueQuarz);
 386 }//void AliRICH::CreateMaterials()
 387 //__________________________________________________________________________________________________
 388 Float_t AliRICH::Fresnel(Float_t ene,Float_t pdoti, Bool_t pola)
 389 {
 390
 391     //ENE(EV), PDOTI=COS(INC.ANG.), PDOTR=COS(POL.PLANE ROT.ANG.)
 392
 393     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,
 394                       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,
 395                       7.8,7.9,8.0,8.1,8.2,8.3,8.4,8.5};
 396     Float_t csin[36] = {2.14,2.21,2.33,2.48,2.76,2.97,2.99,2.59,2.81,3.05,
 397                         2.86,2.53,2.55,2.66,2.79,2.96,3.18,3.05,2.84,2.81,2.38,2.11,
 398                         2.01,2.13,2.39,2.73,3.08,3.15,2.95,2.73,2.56,2.41,2.12,1.95,
 399                         1.72,1.53};
 400     Float_t csik[36] = {0.,0.,0.,0.,0.,0.196,0.408,0.208,0.118,0.49,0.784,0.543,
 401                         0.424,0.404,0.371,0.514,0.922,1.102,1.139,1.376,1.461,1.253,0.878,
 402                         0.69,0.612,0.649,0.824,1.347,1.571,1.678,1.763,1.857,1.824,1.824,
 403                         1.714,1.498};
 404     Float_t xe=ene;
 405     Int_t  j=Int_t(xe*10)-49;
 406     Float_t cn=csin[j]+((csin[j+1]-csin[j])/0.1)*(xe-en[j]);
 407     Float_t ck=csik[j]+((csik[j+1]-csik[j])/0.1)*(xe-en[j]);
 408
 409     //FORMULAE FROM HANDBOOK OF OPTICS, 33.23 OR
 410     //W.R. HUNTER, J.O.S.A. 54 (1964),15 , J.O.S.A. 55(1965),1197
 411
 412     Float_t sinin=TMath::Sqrt(1-pdoti*pdoti);
 413     Float_t tanin=sinin/pdoti;
 414
 415     Float_t c1=cn*cn-ck*ck-sinin*sinin;
 416     Float_t c2=4*cn*cn*ck*ck;
 417     Float_t aO=TMath::Sqrt(0.5*(TMath::Sqrt(c1*c1+c2)+c1));
 418     Float_t b2=0.5*(TMath::Sqrt(c1*c1+c2)-c1);
 419
 420     Float_t rs=((aO-pdoti)*(aO-pdoti)+b2)/((aO+pdoti)*(aO+pdoti)+b2);
 421     Float_t rp=rs*((aO-sinin*tanin)*(aO-sinin*tanin)+b2)/((aO+sinin*tanin)*(aO+sinin*tanin)+b2);
 422
 423
 424     //CORRECTION FACTOR FOR SURFACE ROUGHNESS
 425     //B.J. STAGG  APPLIED OPTICS, 30(1991),4113
 426
 427     Float_t sigraf=18.;
 428     Float_t lamb=1240/ene;
 429     Float_t fresn;
 430
 431     Float_t  rO=TMath::Exp(-(4*TMath::Pi()*pdoti*sigraf/lamb)*(4*TMath::Pi()*pdoti*sigraf/lamb));
 432
 433     if(pola)
 434     {
 435         Float_t pdotr=0.8;                                 //DEGREE OF POLARIZATION : 1->P , -1->S
 436         fresn=0.5*(rp*(1+pdotr)+rs*(1-pdotr));
 437     }
 438     else
 439         fresn=0.5*(rp+rs);
 440
 441     fresn = fresn*rO;
 442     return(fresn);
 443 }//Float_t AliRICH::Fresnel(Float_t ene,Float_t pdoti, Bool_t pola)
 444 //__________________________________________________________________________________________________
 445 Float_t AliRICH::AbsoCH4(Float_t x)
 446 {
 447
 448     //KLOSCH,SCH4(9),WL(9),EM(9),ALENGTH(31)
 449     Float_t sch4[9] = {.12,.16,.23,.38,.86,2.8,7.9,28.,80.};              //MB X 10^22
 450     //Float_t wl[9] = {153.,152.,151.,150.,149.,148.,147.,146.,145};
 451     Float_t em[9] = {8.1,8.158,8.212,8.267,8.322,8.378,8.435,8.493,8.55};
 452     const Float_t kLosch=2.686763E19;                                      // LOSCHMIDT NUMBER IN CM-3
 453     const Float_t kIgas1=100, kIgas2=0, kOxy=10., kWater=5., kPressure=750.,kTemperature=283.;
 454     Float_t pn=kPressure/760.;
 455     Float_t tn=kTemperature/273.16;
 456
 457
 458 // ------- METHANE CROSS SECTION -----------------
 459 // ASTROPH. J. 214, L47 (1978)
 460
 461     Float_t sm=0;
 462     if (x<7.75)
 463         sm=.06e-22;
 464
 465     if(x>=7.75 && x<=8.1)
 466     {
 467         Float_t c0=-1.655279e-1;
 468         Float_t c1=6.307392e-2;
 469         Float_t c2=-8.011441e-3;
 470         Float_t c3=3.392126e-4;
 471         sm=(c0+c1*x+c2*x*x+c3*x*x*x)*1.e-18;
 472     }
 473
 474     if (x> 8.1)
 475     {
 476         Int_t j=0;
 477         while (x<=em[j] && x>=em[j+1])
 478         {
 479             j++;
 480             Float_t a=(sch4[j+1]-sch4[j])/(em[j+1]-em[j]);
 481             sm=(sch4[j]+a*(x-em[j]))*1e-22;
 482         }
 483     }
 484
 485     Float_t dm=(kIgas1/100.)*(1.-((kOxy+kWater)/1.e6))*kLosch*pn/tn;
 486     Float_t abslm=1./sm/dm;
 487
 488 //    ------- ISOBUTHANE CROSS SECTION --------------
 489 //     i-C4H10 (ai) abs. length from curves in
 490 //     Lu-McDonald paper for BARI RICH workshop .
 491 //     -----------------------------------------------------------
 492
 493     Float_t ai;
 494     Float_t absli;
 495     if (kIgas2 != 0)
 496     {
 497         if (x<7.25)
 498             ai=100000000.;
 499
 500         if(x>=7.25 && x<7.375)
 501             ai=24.3;
 502
 503         if(x>=7.375)
 504             ai=.0000000001;
 505
 506         Float_t si = 1./(ai*kLosch*273.16/293.);                    // ISOB. CRO.SEC.IN CM2
 507         Float_t di=(kIgas2/100.)*(1.-((kOxy+kWater)/1.e6))*kLosch*pn/tn;
 508         absli =1./si/di;
 509     }
 510     else
 511         absli=1.e18;
 512 //    ---------------------------------------------------------
 513 //
 514 //       transmission of O2
 515 //
 516 //       y= path in cm, x=energy in eV
 517 //       so= cross section for UV absorption in cm2
 518 //       do= O2 molecular density in cm-3
 519 //    ---------------------------------------------------------
 520
 521     Float_t abslo;
 522     Float_t so=0;
 523     if(x>=6.0)
 524     {
 525         if(x>=6.0 && x<6.5)
 526         {
 527             so=3.392709e-13 * TMath::Exp(2.864104 *x);
 528             so=so*1e-18;
 529         }
 530
 531         if(x>=6.5 && x<7.0)
 532         {
 533             so=2.910039e-34 * TMath::Exp(10.3337*x);
 534             so=so*1e-18;
 535         }
 536
 537
 538         if (x>=7.0)
 539         {
 540             Float_t a0=-73770.76;
 541             Float_t a1=46190.69;
 542             Float_t a2=-11475.44;
 543             Float_t a3=1412.611;
 544             Float_t a4=-86.07027;
 545             Float_t a5=2.074234;
 546             so= a0+(a1*x)+(a2*x*x)+(a3*x*x*x)+(a4*x*x*x*x)+(a5*x*x*x*x*x);
 547             so=so*1e-18;
 548         }
 549
 550         Float_t dox=(kOxy/1e6)*kLosch*pn/tn;
 551         abslo=1./so/dox;
 552     }
 553     else
 554         abslo=1.e18;
 555 //     ---------------------------------------------------------
 556 //
 557 //       transmission of H2O
 558 //
 559 //       y= path in cm, x=energy in eV
 560 //       sw= cross section for UV absorption in cm2
 561 //       dw= H2O molecular density in cm-3
 562 //     ---------------------------------------------------------
 563
 564     Float_t abslw;
 565
 566     Float_t b0=29231.65;
 567     Float_t b1=-15807.74;
 568     Float_t b2=3192.926;
 569     Float_t b3=-285.4809;
 570     Float_t b4=9.533944;
 571
 572     if(x>6.75)
 573     {
 574         Float_t sw= b0+(b1*x)+(b2*x*x)+(b3*x*x*x)+(b4*x*x*x*x);
 575         sw=sw*1e-18;
 576         Float_t dw=(kWater/1e6)*kLosch*pn/tn;
 577         abslw=1./sw/dw;
 578     }
 579     else
 580         abslw=1.e18;
 581
 582 //    ---------------------------------------------------------
 583
 584     Float_t alength=1./(1./abslm+1./absli+1./abslo+1./abslw);
 585     return (alength);
 586 }
 587 //__________________________________________________________________________________________________
 588 void AliRICH::MakeBranch(Option_t* option)
 589 {//Create Tree branches for the RICH.
 590   if(GetDebug())Info("MakeBranch","Start with option= %s.",option);
 591
 592   const Int_t kBufferSize = 4000;
 593
 594   const char *cH = strstr(option,"H");
 595   const char *cD = strstr(option,"D");
 596   const char *cR = strstr(option,"R");
 597   const char *cS = strstr(option,"S");
 598
 599   if(cH&&TreeH()){//H
 600     CreateHits();      //branch will be created in AliDetector::MakeBranch
 601     CreateCerenkovsOld(); MakeBranchInTree(TreeH(),"RICHCerenkov", &fCerenkovs, kBufferSize,0);
 602     CreateSpecialsOld();  MakeBranchInTree(TreeH(),"RICHSpecials", &fSpecials,kBufferSize,0);
 603   }//H
 604   AliDetector::MakeBranch(option);//this is after cH because we need to guarantee that fHits array is created
 605
 606   if(cS&&fLoader->TreeS()){//S
 607     CreateSdigits();   MakeBranchInTree(fLoader->TreeS(),"RICH",&fSdigits,kBufferSize,0) ;
 608   }//S
 609
 610   if(cD&&fLoader->TreeD()){//D
 611     CreateDigitsOld();
 612     for(int i=0;i<kNCH;i++)
 613       MakeBranchInTree(fLoader->TreeD(),Form("%sDigits%d",GetName(),i+1),&((*fDchambers)[i]),kBufferSize,0);
 614   }//D
 615
 616   if(cR&&fLoader->TreeR()){//R
 617     CreateRawClustersOld();
 618     for(int i=0; i<kNCH ;i++)
 619       MakeBranchInTree(fLoader->TreeR(),Form("%sRawClusters%d",GetName(),i+1), &((*fRawClusters)[i]), kBufferSize, 0);
 620
 621     CreateRecos1Old();
 622     for(int i=0; i<kNCH ;i++)
 623       MakeBranchInTree(fLoader->TreeR(),Form("%sRecHits1D%d",GetName(),i+1),&((*fRecHits1D)[i]),kBufferSize,0);
 624
 625     CreateRecos3Old();
 626     for(int i=0; i<kNCH ;i++)
 627       MakeBranchInTree(fLoader->TreeR(),Form("%sRecHits3D%d",GetName(),i+1), &((*fRecHits3D)[i]), kBufferSize, 0);
 628    }//R
 629   if(GetDebug())Info("MakeBranch","Stop.");
 630 }//void AliRICH::MakeBranch(Option_t* option)
 631 //__________________________________________________________________________________________________
 632 void AliRICH::SetTreeAddress()
 633 {//Set branch address for the Hits and Digits Tree.
 634   if(GetDebug())Info("SetTreeAddress","Start.");
 635
 636   TBranch *branch;
 637
 638   if(fLoader->TreeH()){//H
 639     if(GetDebug())Info("SetTreeAddress","tree H is requested.");
 640     CreateHits();//branch map will be in AliDetector::SetTreeAddress
 641     branch=fLoader->TreeH()->GetBranch("RICHCerenkov");   if(branch){CreateCerenkovsOld(); branch->SetAddress(&fCerenkovs);}
 642     branch=fLoader->TreeH()->GetBranch("RICHSpecials");   if(branch){CreateSpecialsOld();  branch->SetAddress(&fSpecials);}
 643   }//H
 644   AliDetector::SetTreeAddress();//this is after TreeH because we need to guarantee that fHits array is created
 645
 646   if(fLoader->TreeS()){//S
 647     if(GetDebug())Info("SetTreeAddress","tree S is requested.");
 648     branch=fLoader->TreeS()->GetBranch(GetName());        if(branch){CreateSdigits();   branch->SetAddress(&fSdigits);}
 649   }//S
 650
 651   if(fLoader->TreeD()){//D
 652     if(GetDebug())Info("SetTreeAddress","tree D is requested.");
 653     for(int i=0;i<kNCH;i++){
 654       branch=fLoader->TreeD()->GetBranch(Form("%s%d",GetName(),i+1));
 655       if(branch){CreateDigits(); branch->SetAddress(&((*fDigitsNew)[i]));}
 656
 657       branch=fLoader->TreeD()->GetBranch(Form("%sDigits%d",GetName(),i+1));
 658       if(branch){CreateDigitsOld(); branch->SetAddress(&((*fDchambers)[i]));}
 659     }//for
 660   }//D
 661
 662   if(fLoader->TreeR()){//R
 663     if(GetDebug())Info("SetTreeAddress","tree R is requested.");
 664
 665     for(int i=0;i<kNCH;i++){
 666       branch=fLoader->TreeR()->GetBranch(Form("%sClusters%d" ,GetName(),i+1));
 667       if(branch){CreateClusters(); branch->SetAddress(&((*fRawClusters)[i]));}
 668     }
 669
 670     for(int i=0;i<kNCH;i++) {
 671       branch=fLoader->TreeR()->GetBranch(Form("%sRawClusters%d" ,GetName(),i+1));
 672       if(branch){CreateRawClustersOld(); branch->SetAddress(&((*fRawClusters)[i]));}
 673
 674       branch=fLoader->TreeR()->GetBranch(Form("%sRecHits1D%d",GetName(),i+1));
 675       if(branch){CreateRecos1Old(); branch->SetAddress(&((*fRecHits1D)[i]));}
 676
 677       branch=fLoader->TreeR()->GetBranch(Form("%sRecHits3D%d",GetName(),i+1));
 678       if(branch){CreateRecos3Old();branch->SetAddress(&((*fRecHits3D)[i]));}
 679     }
 680   }//R
 681   if(GetDebug())Info("SetTreeAddress","Stop.");
 682 }//void AliRICH::SetTreeAddress()
 683 //__________________________________________________________________________________________________
 684 void AliRICH::Print(Option_t *option)const
 685 {
 686   TObject::Print(option);
 687   Param()->Dump();
 688   fChambers->Print(option);
 689 }//void AliRICH::Print(Option_t *option)const
 690 //__________________________________________________________________________________________________
 691 void AliRICH::CreateGeometry()
 692 {//Creates detailed geometry simulation (currently GEANT volumes tree)
 693   if(GetDebug())Info("CreateGeometry","Start.");
 694 //???????? to be removed to AliRICHParam?
 695   Param()->RadiatorToPads(Param()->FreonThickness()/2+Param()->QuartzThickness()+Param()->GapThickness());
 696
 697 //Opaque quartz thickness
 698   Float_t oqua_thickness = .5;
 699 //CsI dimensions
 700   Float_t pcX=Param()->PcSizeX();
 701   Float_t pcY=Param()->PcSizeY();
 702
 703   Int_t *idtmed = fIdtmed->GetArray()-999;
 704
 705   Int_t i;
 706   Float_t zs;
 707   Int_t idrotm[1099];
 708   Float_t par[3];
 709
 710 //External aluminium box
 711   par[0]=68.8*kcm;par[1]=13*kcm;par[2]=70.86*kcm;  gMC->Gsvolu("RICH", "BOX ", idtmed[1009], par, 3);
 712 //Air
 713   par[0]=66.3;   par[1] = 13; par[2] = 68.35;      gMC->Gsvolu("SRIC", "BOX ", idtmed[1000], par, 3);
 714 //Air 2 (cutting the lower part of the box)
 715   par[0]=1.25;    par[1] = 3;    par[2] = 70.86;   gMC->Gsvolu("AIR2", "BOX ", idtmed[1000], par, 3);
 716 //Air 3 (cutting the lower part of the box)
 717   par[0]=66.3;    par[1] = 3;  par[2] = 1.2505;    gMC->Gsvolu("AIR3", "BOX ", idtmed[1000], par, 3);
 718 //Honeycomb
 719   par[0]=66.3;par[1]=0.188;  par[2] = 68.35;       gMC->Gsvolu("HONE", "BOX ", idtmed[1001], par, 3);
 720 //Aluminium sheet
 721   par[0]=66.3;par[1]=0.025;par[2]=68.35;           gMC->Gsvolu("ALUM", "BOX ", idtmed[1009], par, 3);
 722   //par[0] = 66.5; par[1] = .025; par[2] = 63.1;
 723 //Quartz
 724   par[0]=Param()->QuartzWidth()/2;par[1]=Param()->QuartzThickness()/2;par[2]=Param()->QuartzLength()/2;
 725   gMC->Gsvolu("QUAR", "BOX ", idtmed[1002], par, 3);
 726 //Spacers (cylinders)
 727   par[0]=0.;par[1]=.5;par[2]=Param()->FreonThickness()/2;  gMC->Gsvolu("SPAC", "TUBE", idtmed[1002], par, 3);
 728 //Feet (freon slabs supports)
 729   par[0] = .7;  par[1] = .3;  par[2] = 1.9;        gMC->Gsvolu("FOOT", "BOX", idtmed[1009], par, 3);
 730 //Opaque quartz
 731   par[0]=Param()->QuartzWidth()/2;par[1]= .2;par[2]=Param()->QuartzLength()/2;
 732   gMC->Gsvolu("OQUA", "BOX ", idtmed[1007], par, 3);
 733 //Frame of opaque quartz
 734   par[0]=Param()->OuterFreonWidth()/2;par[1]=Param()->FreonThickness()/2;par[2]=Param()->OuterFreonLength()/2;
 735   gMC->Gsvolu("OQF1", "BOX ", idtmed[1007], par, 3);
 736   par[0]=Param()->InnerFreonWidth()/2;par[1]=Param()->FreonThickness()/2;par[2]=Param()->InnerFreonLength()/2;
 737   gMC->Gsvolu("OQF2", "BOX ", idtmed[1007], par, 3);
 738 //Freon
 739   par[0]=Param()->OuterFreonWidth()/2 - oqua_thickness;
 740   par[1]=Param()->FreonThickness()/2;
 741   par[2]=Param()->OuterFreonLength()/2 - 2*oqua_thickness;
 742   gMC->Gsvolu("FRE1", "BOX ", idtmed[1003], par, 3);
 743
 744   par[0]=Param()->InnerFreonWidth()/2 - oqua_thickness;
 745   par[1]=Param()->FreonThickness()/2;
 746   par[2]=Param()->InnerFreonLength()/2 - 2*oqua_thickness;
 747   gMC->Gsvolu("FRE2", "BOX ", idtmed[1003], par, 3);
 748 //Methane
 749   par[0]=pcX/2;par[1]=Param()->GapThickness()/2;par[2]=pcY/2;         gMC->Gsvolu("META","BOX ",idtmed[1004], par, 3);
 750 //Methane gap
 751   par[0]=pcX/2;par[1]=Param()->ProximityGapThickness()/2;par[2]=pcY/2;gMC->Gsvolu("GAP ","BOX ",(*fIdtmed)[kGAP],par,3);
 752 //CsI PC
 753   par[0]=pcX/2;par[1]=.25;par[2]=pcY/2;  gMC->Gsvolu("CSI ", "BOX ", (*fIdtmed)[kCSI], par, 3);
 754 //Anode grid
 755   par[0] = 0.;par[1] = .001;par[2] = 20.;  gMC->Gsvolu("GRID", "TUBE", idtmed[1006], par, 3);
 756
 757 //Wire supports
 758 //Bar of metal
 759   par[0]=pcX/2;par[1]=1.05;par[2]=1.05;  gMC->Gsvolu("WSMe", "BOX ", idtmed[1009], par, 3);
 760 //Ceramic pick up (base)
 761   par[0]=pcX/2;par[1]= .25;par[2]=1.05;  gMC->Gsvolu("WSG1", "BOX ", idtmed[1010], par, 3);
 762 //Ceramic pick up (head)
 763   par[0] = pcX/2;par[1] = .1;par[2] = .1;  gMC->Gsvolu("WSG2", "BOX ", idtmed[1010], par, 3);
 764
 765 //Aluminium supports for methane and CsI
 766 //Short bar
 767   par[0]=pcX/2;par[1]=Param()->GapThickness()/2 + .25; par[2] = (68.35 - pcY/2)/2;
 768   gMC->Gsvolu("SMSH", "BOX", idtmed[1009], par, 3);
 769 //Long bar
 770   par[0]=(66.3 - pcX/2)/2;par[1]=Param()->GapThickness()/2+.25;par[2]=pcY/2+68.35-pcY/2;
 771   gMC->Gsvolu("SMLG", "BOX", idtmed[1009], par, 3);
 772
 773 //Aluminium supports for freon
 774 //Short bar
 775   par[0] = Param()->QuartzWidth()/2; par[1] = .3; par[2] = (68.35 - Param()->QuartzLength()/2)/2;
 776   gMC->Gsvolu("SFSH", "BOX", idtmed[1009], par, 3);
 777 //Long bar
 778   par[0] = (66.3 - Param()->QuartzWidth()/2)/2; par[1] = .3;
 779   par[2] = Param()->QuartzLength()/2 + 68.35 - Param()->QuartzLength()/2;
 780   gMC->Gsvolu("SFLG", "BOX", idtmed[1009], par, 3);
 781 //PCB backplane
 782   par[0] = pcX/2;par[1] = .25; par[2] = pcY/4 -.5025;  gMC->Gsvolu("PCB ", "BOX", idtmed[1011], par, 3);
 783
 784 //Backplane supports
 785 //Aluminium slab
 786   par[0] = 33.15;par[1] = 2;par[2] = 21.65;  gMC->Gsvolu("BACK", "BOX", idtmed[1009], par, 3);
 787 //Big hole
 788   par[0] = 9.05; par[1] = 2; par[2] = 4.4625;  gMC->Gsvolu("BKHL", "BOX", idtmed[1000], par, 3);
 789 //Small hole
 790   par[0] = 5.7;par[1] = 2;par[2] = 4.4625;  gMC->Gsvolu("BKHS", "BOX", idtmed[1000], par, 3);
 791 //Place holes inside backplane support
 792   gMC->Gspos("BKHS", 1, "BACK", .8 + 5.7,0., .6 + 4.4625, 0, "ONLY");
 793   gMC->Gspos("BKHS", 2, "BACK", -.8 - 5.7,0., .6 + 4.4625, 0, "ONLY");
 794   gMC->Gspos("BKHS", 3, "BACK", .8 + 5.7,0., -.6 - 4.4625, 0, "ONLY");
 795   gMC->Gspos("BKHS", 4, "BACK", -.8 - 5.7,0., -.6 - 4.4625, 0, "ONLY");
 796   gMC->Gspos("BKHS", 5, "BACK", .8 + 5.7,0., .6 + 8.925 + 1.2 + 4.4625, 0, "ONLY");
 797   gMC->Gspos("BKHS", 6, "BACK", -.8 - 5.7,0., .6 + 8.925 + 1.2 + 4.4625, 0, "ONLY");
 798   gMC->Gspos("BKHS", 7, "BACK", .8 + 5.7,0., -.6 - 8.925 - 1.2 - 4.4625, 0, "ONLY");
 799   gMC->Gspos("BKHS", 8, "BACK", -.8 - 5.7,0., -.6 - 8.925 - 1.2 - 4.4625, 0, "ONLY");
 800   gMC->Gspos("BKHL", 1, "BACK", .8 + 11.4 + 1.6 + 9.05, 0., .6 + 4.4625, 0, "ONLY");
 801   gMC->Gspos("BKHL", 2, "BACK", -.8 - 11.4 - 1.6 - 9.05, 0., .6 + 4.4625, 0, "ONLY");
 802   gMC->Gspos("BKHL", 3, "BACK", .8 + 11.4 + 1.6 + 9.05, 0., -.6 - 4.4625, 0, "ONLY");
 803   gMC->Gspos("BKHL", 4, "BACK", -.8 - 11.4 - 1.6 - 9.05, 0., -.6 - 4.4625, 0, "ONLY");
 804   gMC->Gspos("BKHL", 5, "BACK", .8 + 11.4+ 1.6 + 9.05, 0., .6 + 8.925 + 1.2 + 4.4625, 0, "ONLY");
 805   gMC->Gspos("BKHL", 6, "BACK", -.8 - 11.4 - 1.6 - 9.05, 0., .6 + 8.925 + 1.2 + 4.4625, 0, "ONLY");
 806   gMC->Gspos("BKHL", 7, "BACK", .8 + 11.4 + 1.6 + 9.05, 0., -.6 - 8.925 - 1.2 - 4.4625, 0, "ONLY");
 807   gMC->Gspos("BKHL", 8, "BACK", -.8 - 11.4 - 1.6 - 9.05, 0., -.6 - 8.925 - 1.2 - 4.4625, 0, "ONLY");
 808 //Place material inside RICH
 809   gMC->Gspos("SRIC", 1, "RICH", 0.,0., 0., 0, "ONLY");
 810   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");
 811   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");
 812   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");
 813   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");
 814   gMC->Gspos("ALUM", 1, "SRIC", 0., 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .6 - .05 - .376 -.025, 0., 0, "ONLY");
 815   gMC->Gspos("HONE", 1, "SRIC", 0., 1.276- Param()->GapThickness()/2  - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .6 - .05 - .188, 0., 0, "ONLY");
 816   gMC->Gspos("ALUM", 2, "SRIC", 0., 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .6 - .025, 0., 0, "ONLY");
 817   gMC->Gspos("FOOT", 1, "SRIC", 64.95, 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .3, 36.9, 0, "ONLY");
 818   gMC->Gspos("FOOT", 2, "SRIC", 21.65, 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .3 , 36.9, 0, "ONLY");
 819   gMC->Gspos("FOOT", 3, "SRIC", -21.65, 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .3, 36.9, 0, "ONLY");
 820   gMC->Gspos("FOOT", 4, "SRIC", -64.95, 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .3, 36.9, 0, "ONLY");
 821   gMC->Gspos("FOOT", 5, "SRIC", 64.95, 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .3, -36.9, 0, "ONLY");
 822   gMC->Gspos("FOOT", 6, "SRIC", 21.65, 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .3, -36.9, 0, "ONLY");
 823   gMC->Gspos("FOOT", 7, "SRIC", -21.65, 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .3, -36.9, 0, "ONLY");
 824   gMC->Gspos("FOOT", 8, "SRIC", -64.95, 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .3, -36.9, 0, "ONLY");
 825   gMC->Gspos("OQUA", 1, "SRIC", 0., 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .2, 0., 0, "ONLY");
 826 // Methane supports
 827   gMC->Gspos("SMLG", 1, "SRIC", pcX/2 + (66.3 - pcX/2)/2, 1.276 + .25, 0., 0, "ONLY");
 828   gMC->Gspos("SMLG", 2, "SRIC", - pcX/2 - (66.3 - pcX/2)/2, 1.276 + .25, 0., 0, "ONLY");
 829   gMC->Gspos("SMSH", 1, "SRIC", 0., 1.276 + .25, pcY/2 + (68.35 - pcY/2)/2, 0, "ONLY");
 830   gMC->Gspos("SMSH", 2, "SRIC", 0., 1.276 + .25, - pcY/2 - (68.35 - pcY/2)/2, 0, "ONLY");
 831 //Freon supports
 832   Float_t supp_y = 1.276 - Param()->GapThickness()/2- Param()->QuartzThickness() -Param()->FreonThickness() - .2 + .3; //y position of freon supports
 833   gMC->Gspos("SFLG", 1, "SRIC", Param()->QuartzWidth()/2 + (66.3 - Param()->QuartzWidth()/2)/2, supp_y, 0., 0, "ONLY");
 834   gMC->Gspos("SFLG", 2, "SRIC", - Param()->QuartzWidth()/2 - (66.3 - Param()->QuartzWidth()/2)/2, supp_y, 0., 0, "ONLY");
 835   gMC->Gspos("SFSH", 1, "SRIC", 0., supp_y, Param()->QuartzLength()/2 + (68.35 - Param()->QuartzLength()/2)/2, 0, "ONLY");
 836   gMC->Gspos("SFSH", 2, "SRIC", 0., supp_y, - Param()->QuartzLength()/2 - (68.35 - Param()->QuartzLength()/2)/2, 0, "ONLY");
 837   AliMatrix(idrotm[1019], 0., 0., 90., 0., 90., 90.);
 838 //Place spacers
 839   Int_t nspacers = 30;
 840   for (i = 0; i < nspacers/3; i++) {
 841     zs = -11.6/2 + (TMath::Abs(nspacers/6) - i) * 12.2;
 842     gMC->Gspos("SPAC", i, "FRE1", 10.5, 0., zs, idrotm[1019], "ONLY");  //Original settings
 843   }
 844   for (i = nspacers/3; i < (nspacers*2)/3; i++) {
 845     zs = -11.6/2 + (nspacers/3 + TMath::Abs(nspacers/6) - i) * 12.2;
 846     gMC->Gspos("SPAC", i, "FRE1", 0, 0., zs, idrotm[1019], "ONLY");  //Original settings
 847   }
 848   for (i = (nspacers*2)/3; i < nspacers; ++i) {
 849     zs = -11.6/2 + ((nspacers*2)/3 + TMath::Abs(nspacers/6) - i) * 12.2;
 850     gMC->Gspos("SPAC", i, "FRE1", -10.5, 0., zs, idrotm[1019], "ONLY"); //Original settings
 851   }
 852   for (i = 0; i < nspacers/3; i++) {
 853     zs = -11.6/2 + (TMath::Abs(nspacers/6) - i) * 12.2;
 854     gMC->Gspos("SPAC", i, "FRE2", 10.5, 0., zs, idrotm[1019], "ONLY");  //Original settings
 855   }
 856   for (i = nspacers/3; i < (nspacers*2)/3; i++) {
 857     zs = -11.6/2 + (nspacers/3 + TMath::Abs(nspacers/6) - i) * 12.2;
 858     gMC->Gspos("SPAC", i, "FRE2", 0, 0., zs, idrotm[1019], "ONLY");  //Original settings
 859   }
 860   for (i = (nspacers*2)/3; i < nspacers; ++i) {
 861     zs = -11.6/2 + ((nspacers*2)/3 + TMath::Abs(nspacers/6) - i) * 12.2;
 862     gMC->Gspos("SPAC", i, "FRE2", -10.5, 0., zs, idrotm[1019], "ONLY"); //Original settings
 863   }
 864   gMC->Gspos("FRE1", 1, "OQF1", 0., 0., 0., 0, "ONLY");
 865   gMC->Gspos("FRE2", 1, "OQF2", 0., 0., 0., 0, "ONLY");
 866   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)
 867   gMC->Gspos("OQF2", 2, "SRIC", 0., 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()/2, 0., 0, "ONLY");          //Original settings
 868   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)
 869   gMC->Gspos("QUAR", 1, "SRIC", 0., 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness()/2, 0., 0, "ONLY");
 870   gMC->Gspos("GAP ", 1, "META", 0., Param()->GapThickness()/2 - Param()->ProximityGapThickness()/2 - 0.0001, 0., 0, "ONLY");
 871   gMC->Gspos("META", 1, "SRIC", 0., 1.276, 0., 0, "ONLY");
 872   gMC->Gspos("CSI ", 1, "SRIC", 0., 1.276 + Param()->GapThickness()/2 + .25, 0., 0, "ONLY");
 873 //Wire support placing
 874   gMC->Gspos("WSG2", 1, "GAP ", 0., Param()->ProximityGapThickness()/2 - .1, 0., 0, "ONLY");
 875   gMC->Gspos("WSG1", 1, "CSI ", 0., 0., 0., 0, "ONLY");
 876   gMC->Gspos("WSMe", 1, "SRIC ", 0., 1.276 + Param()->GapThickness()/2 + .5 + 1.05, 0., 0, "ONLY");
 877 //Backplane placing
 878   gMC->Gspos("BACK", 1, "SRIC ", -33.15, 1.276 + Param()->GapThickness()/2 + .5 + 2.1 + 2, 43.3, 0, "ONLY");
 879   gMC->Gspos("BACK", 2, "SRIC ", 33.15, 1.276 + Param()->GapThickness()/2 + .5 + 2.1 + 2 , 43.3, 0, "ONLY");
 880   gMC->Gspos("BACK", 3, "SRIC ", -33.15, 1.276 + Param()->GapThickness()/2 + .5 + 2.1 + 2, 0., 0, "ONLY");
 881   gMC->Gspos("BACK", 4, "SRIC ", 33.15, 1.276 + Param()->GapThickness()/2 + .5 + 2.1 + 2, 0., 0, "ONLY");
 882   gMC->Gspos("BACK", 5, "SRIC ", 33.15, 1.276 + Param()->GapThickness()/2 + .5 + 2.1 + 2, -43.3, 0, "ONLY");
 883   gMC->Gspos("BACK", 6, "SRIC ", -33.15, 1.276 + Param()->GapThickness()/2 + .5 + 2.1 + 2, -43.3, 0, "ONLY");
 884 //PCB placing
 885   gMC->Gspos("PCB ", 1, "SRIC ", 0.,  1.276 + Param()->GapThickness()/2 + .5 + 1.05, pcX/4 + .5025 + 2.5, 0, "ONLY");
 886   gMC->Gspos("PCB ", 2, "SRIC ", 0.,  1.276 + Param()->GapThickness()/2 + .5 + 1.05, -pcX/4 - .5025 - 2.5, 0, "ONLY");
 887
 888 //place chambers into mother volume ALIC
 889   for(int i=1;i<=kNCH;i++){
 890     AliMatrix(idrotm[1000+i],C(i)->ThetaXd(),C(i)->PhiXd(),
 891                              C(i)->ThetaYd(),C(i)->PhiYd(),
 892                              C(i)->ThetaZd(),C(i)->PhiZd());
 893     gMC->Gspos("RICH",i,"ALIC",C(i)->X(),C(i)->Y(),C(i)->Z(),idrotm[1000+i], "ONLY");
 894   }
 895
 896   if(GetDebug())Info("CreateGeometry","Stop.");
 897 }//void AliRICH::CreateGeometry()
 898 //__________________________________________________________________________________________________
 899 void AliRICH::CreateChambers()
 900 {//create all RICH Chambers, do nothing if already created.
 901   if(fChambers) return;//
 902   if(GetDebug())Info("CreateChambers","Creating RICH chambers.");
 903   fChambers=new TObjArray(kNCH);
 904   fChambers->SetOwner();
 905   for(int i=0;i<kNCH;i++)  fChambers->AddAt(new AliRICHChamber(i+1,Param()),i);
 906 }//void AliRICH::CreateChambers()
 907 //__________________________________________________________________________________________________
 908 void AliRICH::GenerateFeedbacks(Int_t iChamber,Float_t eloss)
 909 {// Generate FeedBack photons
 910   Int_t j;
 911   Float_t cthf, phif, enfp = 0, sthf;
 912   Float_t e1[3], e2[3], e3[3];
 913   Float_t vmod, uswop;
 914   Float_t dir[3], phi;
 915   Float_t pol[3], mom[4];
 916 //Determine number of feedback photons
 917   TLorentzVector x4;
 918   gMC->TrackPosition(x4);
 919   Float_t charge=Param()->TotalCharge(gMC->TrackPid(),eloss,C(iChamber)->G2Ly(x4));//Total Charge
 920   Int_t iNphotons=gMC->GetRandom()->Poisson(Param()->AlphaFeedback()*charge);
 921   Info("GenerateFeedbacks","N photons=%i",iNphotons);
 922 //Generate photons
 923   for(Int_t i=0;i<iNphotons;i++){
 924     Double_t ranf[2];
 925     gMC->GetRandom()->RndmArray(2,ranf);    //Sample direction
 926     cthf=ranf[0]*2-1.0;
 927     if(cthf<0) continue;
 928     sthf = TMath::Sqrt((1 - cthf) * (1 + cthf));
 929     phif = ranf[1] * 2 * TMath::Pi();
 930
 931     if(Double_t randomNumber=gMC->GetRandom()->Rndm()<=0.57)
 932       enfp = 7.5e-9;
 933     else if(randomNumber<=0.7)
 934       enfp = 6.4e-9;
 935     else
 936       enfp = 7.9e-9;
 937
 938
 939     dir[0] = sthf * TMath::Sin(phif);    dir[1] = cthf;    dir[2] = sthf * TMath::Cos(phif);
 940     gMC->Gdtom(dir, mom, 2);
 941     mom[0]*=enfp;    mom[1]*=enfp;    mom[2]*=enfp;
 942     mom[3] = TMath::Sqrt(mom[0]*mom[0]+mom[1]*mom[1]+mom[2]*mom[2]);
 943
 944     // Polarisation
 945     e1[0]=      0;    e1[1]=-dir[2];    e1[2]= dir[1];
 946     e2[0]=-dir[1];    e2[1]= dir[0];    e2[2]=      0;
 947     e3[0]= dir[1];    e3[1]=      0;    e3[2]=-dir[0];
 948
 949     vmod=0;
 950     for(j=0;j<3;j++) vmod+=e1[j]*e1[j];
 951     if (!vmod) for(j=0;j<3;j++) {
 952       uswop=e1[j];
 953       e1[j]=e3[j];
 954       e3[j]=uswop;
 955     }
 956     vmod=0;
 957     for(j=0;j<3;j++) vmod+=e2[j]*e2[j];
 958     if (!vmod) for(j=0;j<3;j++) {
 959       uswop=e2[j];
 960       e2[j]=e3[j];
 961       e3[j]=uswop;
 962     }
 963
 964     vmod=0;
 965     for(j=0;j<3;j++) vmod+=e1[j]*e1[j];
 966     vmod=TMath::Sqrt(1/vmod);
 967     for(j=0;j<3;j++) e1[j]*=vmod;
 968
 969     vmod=0;
 970     for(j=0;j<3;j++) vmod+=e2[j]*e2[j];
 971     vmod=TMath::Sqrt(1/vmod);
 972     for(j=0;j<3;j++) e2[j]*=vmod;
 973
 974     phi = gMC->GetRandom()->Rndm()* 2 * TMath::Pi();
 975     for(j=0;j<3;j++) pol[j]=e1[j]*TMath::Sin(phi)+e2[j]*TMath::Cos(phi);
 976     gMC->Gdtom(pol, pol, 2);
 977     Int_t outputNtracksStored;
 978     gAlice->PushTrack(1,                             //do not transport
 979                      gAlice->GetCurrentTrackNumber(),//parent track
 980                      kFeedback,                      //PID
 981                      mom[0],mom[1],mom[2],mom[3],    //track momentum
 982                      x4.X(),x4.Y(),x4.Z(),x4.T(),    //track origin
 983                      pol[0],pol[1],pol[2],           //polarization
 984                      kPFeedBackPhoton,outputNtracksStored,1.0);
 985
 986   }
 987 }//Int_t AliRICH::FeedBackPhotons()
 988 //__________________________________________________________________________________________________