MUON/AliMUONSt2GeometryBuilder.cxx

   1 // $Id$
   2 //
   3 // Class AliMUONSt2GeometryBuilder
   4 // -------------------------------
   5 // Abstract base class for geometry construction per chamber.
   6 //
   7 // Author: Ivana Hrivnacova, IPN Orsay
   8
   9 #include <TVirtualMC.h>
  10 #include <TGeoMatrix.h>
  11
  12 #include "AliMUONSt2GeometryBuilder.h"
  13 #include "AliMUON.h"
  14 #include "AliMUONChamber.h"
  15 #include "AliMUONChamberGeometry.h"
  16
  17 ClassImp(AliMUONSt2GeometryBuilder)
  18
  19 //______________________________________________________________________________
  20 AliMUONSt2GeometryBuilder::AliMUONSt2GeometryBuilder(AliMUON* muon)
  21  : AliMUONVGeometryBuilder(&muon->Chamber(2), &muon->Chamber(3)),
  22    fMUON(muon)
  23 {
  24 // Standard constructor
  25
  26 }
  27
  28 //______________________________________________________________________________
  29 AliMUONSt2GeometryBuilder::AliMUONSt2GeometryBuilder()
  30  : AliMUONVGeometryBuilder(),
  31    fMUON(0)
  32 {
  33 // Default constructor
  34 }
  35
  36
  37 //______________________________________________________________________________
  38 AliMUONSt2GeometryBuilder::AliMUONSt2GeometryBuilder(const AliMUONSt2GeometryBuilder& rhs)
  39   : AliMUONVGeometryBuilder(rhs)
  40 {
  41   Fatal("Copy constructor",
  42         "Copy constructor is not implemented.");
  43 }
  44
  45 //______________________________________________________________________________
  46 AliMUONSt2GeometryBuilder::~AliMUONSt2GeometryBuilder() {
  47 //
  48 }
  49
  50 //______________________________________________________________________________
  51 AliMUONSt2GeometryBuilder&
  52 AliMUONSt2GeometryBuilder::operator = (const AliMUONSt2GeometryBuilder& rhs)
  53 {
  54   // check assignement to self
  55   if (this == &rhs) return *this;
  56
  57   Fatal("operator=",
  58         "Assignment operator is not implemented.");
  59
  60   return *this;
  61 }
  62
  63 //
  64 // public methods
  65 //
  66
  67 //______________________________________________________________________________
  68 void AliMUONSt2GeometryBuilder::CreateGeometry()
  69 {
  70 // From AliMUONv1::CreateGeometry()
  71
  72 //
  73 //********************************************************************
  74 //                            Station 2                             **
  75 //********************************************************************
  76      // indices 1 and 2 for first and second chambers in the station
  77      // iChamber (first chamber) kept for other quanties than Z,
  78      // assumed to be the same in both chambers
  79
  80      // Get tracking medias Ids
  81      Int_t *idtmed = fMUON->GetIdtmed()->GetArray()-1099;
  82      Int_t idAir= idtmed[1100]; // medium 1
  83      Int_t idAlu1=idtmed[1103]; // medium 4
  84      Int_t idAlu2=idtmed[1104]; // medium 5
  85      Int_t idGas=idtmed[1108];  // medium 9 = Ar-CO2 gas (80%+20%)
  86      Bool_t frameCrosses=kTRUE;
  87
  88      // Rotation matrices in the x-y plane
  89      // phi= 0 deg
  90      Int_t irot1;
  91      fMUON->AliMatrix(irot1,  90.,   0., 90.,  90., 0., 0.);
  92      // phi= 90 deg
  93      Int_t irot2;
  94      fMUON->AliMatrix(irot2,  90.,  90., 90., 180., 0., 0.);
  95
  96      AliMUONChamber* iChamber = GetChamber(2);
  97      AliMUONChamber* iChamber1 = iChamber;
  98      AliMUONChamber* iChamber2 = GetChamber(3);
  99
 100      // Half of the total thickness of frame crosses (including DAlu)
 101      // for each chamber in stations 1 and 2:
 102      // 3% of X0 of composite material,
 103      // but taken as Aluminium here, with same thickness in number of X0
 104      Float_t dframez = 3. * 8.9 / 100;
 105      // DGas and DAlu not changed from standard values
 106      Double_t zfpos=-(iChamber->DGas()+dframez+iChamber->DAlu())/2;
 107              // The same parameters are defined in builder for station 1
 108
 109      // Mother volume
 110      // Outer excess and inner recess for mother volume radius
 111      // with respect to ROuter and RInner
 112      Float_t dframep=.001; // Value for station 3 should be 6 ...
 113      // Width (RdPhi) of the frame crosses for stations 1 and 2 (cm)
 114      // Float_t dframep1=.001;
 115      Float_t phi=2*TMath::Pi()/12/2;
 116              // The same parameters are defined in builder for station 1
 117
 118      Float_t tpar[3];
 119      Double_t dstation = (-iChamber2->Z()) - (-iChamber1->Z());
 120      tpar[0] = iChamber->RInner()-dframep;
 121      tpar[1] = (iChamber->ROuter()+dframep)/TMath::Cos(phi);
 122      tpar[2] = dstation/5;
 123
 124      gMC->Gsvolu("S03M", "TUBE", idAir, tpar, 3);
 125      gMC->Gsvolu("S04M", "TUBE", idAir, tpar, 3);
 126
 127      // CHANGED
 128      //gMC->Gspos("S03M", 1, "ALIC", 0., 0., zpos1 , 0, "ONLY");
 129      //gMC->Gspos("S04M", 1, "ALIC", 0., 0., zpos2 , 0, "ONLY");
 130      GetChamber(2)->GetGeometry()->AddEnvelope("S03M", false);
 131      GetChamber(3)->GetGeometry()->AddEnvelope("S04M", false);
 132
 133      gMC->Gsbool("S03M", "L3DO");
 134      gMC->Gsbool("S03M", "L3O1");
 135      gMC->Gsbool("S03M", "L3O2");
 136      gMC->Gsbool("S04M", "L3DO");
 137      gMC->Gsbool("S04M", "L3O1");
 138      gMC->Gsbool("S04M", "L3O2");
 139
 140 // // Aluminium frames
 141 // // Outer frames
 142 //      pgpar[0] = 360/12/2;
 143 //      pgpar[1] = 360.;
 144 //      pgpar[2] = 12.;
 145 //      pgpar[3] =   2;
 146 //      pgpar[4] = -dframez/2;
 147 //      pgpar[5] = iChamber->ROuter();
 148 //      pgpar[6] = pgpar[5]+dframep;
 149 //      pgpar[7] = +dframez/2;
 150 //      pgpar[8] = pgpar[5];
 151 //      pgpar[9] = pgpar[6];
 152 //      gMC->Gsvolu("S03O", "PGON", idAlu1, pgpar, 10);
 153 //      gMC->Gsvolu("S04O", "PGON", idAlu1, pgpar, 10);
 154 //      gMC->Gspos("S03O",1,"S03M", 0.,0.,-zfpos,  0,"ONLY");
 155 //      gMC->Gspos("S03O",2,"S03M", 0.,0.,+zfpos,  0,"ONLY");
 156 //      gMC->Gspos("S04O",1,"S04M", 0.,0.,-zfpos,  0,"ONLY");
 157 //      gMC->Gspos("S04O",2,"S04M", 0.,0.,+zfpos,  0,"ONLY");
 158 // //
 159 // // Inner frame
 160 //      tpar[0]= iChamber->RInner()-dframep;
 161 //      tpar[1]= iChamber->RInner();
 162 //      tpar[2]= dframez/2;
 163 //      gMC->Gsvolu("S03I", "TUBE", idAlu1, tpar, 3);
 164 //      gMC->Gsvolu("S04I", "TUBE", idAlu1, tpar, 3);
 165
 166 //      gMC->Gspos("S03I",1,"S03M", 0.,0.,-zfpos,  0,"ONLY");
 167 //      gMC->Gspos("S03I",2,"S03M", 0.,0.,+zfpos,  0,"ONLY");
 168 //      gMC->Gspos("S04I",1,"S04M", 0.,0.,-zfpos,  0,"ONLY");
 169 //      gMC->Gspos("S04I",2,"S04M", 0.,0.,+zfpos,  0,"ONLY");
 170 //
 171 // Frame Crosses
 172      if (frameCrosses) {
 173          // outside gas
 174          // security for inside mother volume
 175
 176          // ADDED !! Repeated
 177          Float_t dframep1 = 11.0;
 178          Float_t dframez = 3. * 8.9 / 100;
 179
 180          Float_t bpar[3];
 181          bpar[0] = (iChamber->ROuter() - iChamber->RInner())
 182            * TMath::Cos(TMath::ASin(dframep1 /
 183                                    (iChamber->ROuter() - iChamber->RInner())))
 184            / 2.0;
 185          bpar[1] = dframep1/2;
 186          // total thickness will be (4 * bpar[2]) for each chamber,
 187          // which has to be equal to (2 * dframez) - DAlu
 188          bpar[2] = (2.0 * dframez - iChamber->DAlu()) / 4.0;
 189          gMC->Gsvolu("S03B", "BOX", idAlu1, bpar, 3);
 190          gMC->Gsvolu("S04B", "BOX", idAlu1, bpar, 3);
 191
 192          gMC->Gspos("S03B",1,"S03M", +iChamber->RInner()+bpar[0] , 0,-zfpos,
 193                     irot1,"ONLY");
 194          gMC->Gspos("S03B",2,"S03M", -iChamber->RInner()-bpar[0] , 0,-zfpos,
 195                     irot1,"ONLY");
 196          gMC->Gspos("S03B",3,"S03M", 0, +iChamber->RInner()+bpar[0] ,-zfpos,
 197                     irot2,"ONLY");
 198          gMC->Gspos("S03B",4,"S03M", 0, -iChamber->RInner()-bpar[0] ,-zfpos,
 199                     irot2,"ONLY");
 200          gMC->Gspos("S03B",5,"S03M", +iChamber->RInner()+bpar[0] , 0,+zfpos,
 201                     irot1,"ONLY");
 202          gMC->Gspos("S03B",6,"S03M", -iChamber->RInner()-bpar[0] , 0,+zfpos,
 203                     irot1,"ONLY");
 204          gMC->Gspos("S03B",7,"S03M", 0, +iChamber->RInner()+bpar[0] ,+zfpos,
 205                     irot2,"ONLY");
 206          gMC->Gspos("S03B",8,"S03M", 0, -iChamber->RInner()-bpar[0] ,+zfpos,
 207                     irot2,"ONLY");
 208
 209          gMC->Gspos("S04B",1,"S04M", +iChamber->RInner()+bpar[0] , 0,-zfpos,
 210                     irot1,"ONLY");
 211          gMC->Gspos("S04B",2,"S04M", -iChamber->RInner()-bpar[0] , 0,-zfpos,
 212                     irot1,"ONLY");
 213          gMC->Gspos("S04B",3,"S04M", 0, +iChamber->RInner()+bpar[0] ,-zfpos,
 214                     irot2,"ONLY");
 215          gMC->Gspos("S04B",4,"S04M", 0, -iChamber->RInner()-bpar[0] ,-zfpos,
 216                     irot2,"ONLY");
 217          gMC->Gspos("S04B",5,"S04M", +iChamber->RInner()+bpar[0] , 0,+zfpos,
 218                     irot1,"ONLY");
 219          gMC->Gspos("S04B",6,"S04M", -iChamber->RInner()-bpar[0] , 0,+zfpos,
 220                     irot1,"ONLY");
 221          gMC->Gspos("S04B",7,"S04M", 0, +iChamber->RInner()+bpar[0] ,+zfpos,
 222                     irot2,"ONLY");
 223          gMC->Gspos("S04B",8,"S04M", 0, -iChamber->RInner()-bpar[0] ,+zfpos,
 224                     irot2,"ONLY");
 225      }
 226 //
 227 //   Chamber Material represented by Alu sheet
 228      tpar[0]= iChamber->RInner();
 229      tpar[1]= iChamber->ROuter();
 230      tpar[2] = (iChamber->DGas()+iChamber->DAlu())/2;
 231      gMC->Gsvolu("S03A", "TUBE", idAlu2, tpar, 3);
 232      gMC->Gsvolu("S04A", "TUBE", idAlu2, tpar, 3);
 233      gMC->Gspos("S03A", 1, "S03M", 0., 0., 0.,  0, "ONLY");
 234      gMC->Gspos("S04A", 1, "S04M", 0., 0., 0.,  0, "ONLY");
 235 //
 236 //   Sensitive volumes
 237      // tpar[2] = iChamber->DGas();
 238      tpar[2] = iChamber->DGas()/2;
 239      gMC->Gsvolu("S03G", "TUBE", idGas, tpar, 3);
 240      gMC->Gsvolu("S04G", "TUBE", idGas, tpar, 3);
 241      gMC->Gspos("S03G", 1, "S03A", 0., 0., 0.,  0, "ONLY");
 242      gMC->Gspos("S04G", 1, "S04A", 0., 0., 0.,  0, "ONLY");
 243 //
 244 // Frame Crosses to be placed inside gas
 245      // NONE: chambers are sensitive everywhere
 246 //      if (frameCrosses) {
 247
 248 //       dr = (iChamber->ROuter() - iChamber->RInner());
 249 //       bpar[0] = TMath::Sqrt(dr*dr-dframep1*dframep1/4)/2;
 250 //       bpar[1] = dframep1/2;
 251 //       bpar[2] = iChamber->DGas()/2;
 252 //       gMC->Gsvolu("S03F", "BOX", idAlu1, bpar, 3);
 253 //       gMC->Gsvolu("S04F", "BOX", idAlu1, bpar, 3);
 254
 255 //       gMC->Gspos("S03F",1,"S03G", +iChamber->RInner()+bpar[0] , 0, 0,
 256 //                  irot1,"ONLY");
 257 //       gMC->Gspos("S03F",2,"S03G", -iChamber->RInner()-bpar[0] , 0, 0,
 258 //                  irot1,"ONLY");
 259 //       gMC->Gspos("S03F",3,"S03G", 0, +iChamber->RInner()+bpar[0] , 0,
 260 //                  irot2,"ONLY");
 261 //       gMC->Gspos("S03F",4,"S03G", 0, -iChamber->RInner()-bpar[0] , 0,
 262 //                  irot2,"ONLY");
 263
 264 //       gMC->Gspos("S04F",1,"S04G", +iChamber->RInner()+bpar[0] , 0, 0,
 265 //                  irot1,"ONLY");
 266 //       gMC->Gspos("S04F",2,"S04G", -iChamber->RInner()-bpar[0] , 0, 0,
 267 //                  irot1,"ONLY");
 268 //       gMC->Gspos("S04F",3,"S04G", 0, +iChamber->RInner()+bpar[0] , 0,
 269 //                  irot2,"ONLY");
 270 //       gMC->Gspos("S04F",4,"S04G", 0, -iChamber->RInner()-bpar[0] , 0,
 271 //                  irot2,"ONLY");
 272 //      }
 273 /*
 274      iChamber1 = iChamber = (AliMUONChamber*) (*fChambers)[2];
 275      iChamber2 =(AliMUONChamber*) (*fChambers)[3];
 276      zpos1=iChamber1->Z();
 277      zpos2=iChamber2->Z();
 278      dstation = zpos2 - zpos1;
 279      // DGas and DAlu not changed from standard values
 280      zfpos=-(iChamber->DGas()+dframez+iChamber->DAlu())/2;
 281
 282 //
 283 //   Mother volume
 284      tpar[0] = iChamber->RInner()-dframep;
 285      tpar[1] = (iChamber->ROuter()+dframep)/TMath::Cos(phi);
 286      tpar[2] = dstation/5;
 287
 288      gMC->Gsvolu("S03M", "TUBE", idAir, tpar, 3);
 289      gMC->Gsvolu("S04M", "TUBE", idAir, tpar, 3);
 290      gMC->Gspos("S03M", 1, "ALIC", 0., 0., zpos1 , 0, "ONLY");
 291      gMC->Gspos("S04M", 1, "ALIC", 0., 0., zpos2 , 0, "ONLY");
 292      gMC->Gsbool("S03M", "L3DO");
 293      gMC->Gsbool("S03M", "L3O1");
 294      gMC->Gsbool("S03M", "L3O2");
 295      gMC->Gsbool("S04M", "L3DO");
 296      gMC->Gsbool("S04M", "L3O1");
 297      gMC->Gsbool("S04M", "L3O2");
 298
 299 // // Aluminium frames
 300 // // Outer frames
 301 //      pgpar[0] = 360/12/2;
 302 //      pgpar[1] = 360.;
 303 //      pgpar[2] = 12.;
 304 //      pgpar[3] =   2;
 305 //      pgpar[4] = -dframez/2;
 306 //      pgpar[5] = iChamber->ROuter();
 307 //      pgpar[6] = pgpar[5]+dframep;
 308 //      pgpar[7] = +dframez/2;
 309 //      pgpar[8] = pgpar[5];
 310 //      pgpar[9] = pgpar[6];
 311 //      gMC->Gsvolu("S03O", "PGON", idAlu1, pgpar, 10);
 312 //      gMC->Gsvolu("S04O", "PGON", idAlu1, pgpar, 10);
 313 //      gMC->Gspos("S03O",1,"S03M", 0.,0.,-zfpos,  0,"ONLY");
 314 //      gMC->Gspos("S03O",2,"S03M", 0.,0.,+zfpos,  0,"ONLY");
 315 //      gMC->Gspos("S04O",1,"S04M", 0.,0.,-zfpos,  0,"ONLY");
 316 //      gMC->Gspos("S04O",2,"S04M", 0.,0.,+zfpos,  0,"ONLY");
 317 // //
 318 // // Inner frame
 319 //      tpar[0]= iChamber->RInner()-dframep;
 320 //      tpar[1]= iChamber->RInner();
 321 //      tpar[2]= dframez/2;
 322 //      gMC->Gsvolu("S03I", "TUBE", idAlu1, tpar, 3);
 323 //      gMC->Gsvolu("S04I", "TUBE", idAlu1, tpar, 3);
 324
 325 //      gMC->Gspos("S03I",1,"S03M", 0.,0.,-zfpos,  0,"ONLY");
 326 //      gMC->Gspos("S03I",2,"S03M", 0.,0.,+zfpos,  0,"ONLY");
 327 //      gMC->Gspos("S04I",1,"S04M", 0.,0.,-zfpos,  0,"ONLY");
 328 //      gMC->Gspos("S04I",2,"S04M", 0.,0.,+zfpos,  0,"ONLY");
 329 //
 330 // Frame Crosses
 331      if (frameCrosses) {
 332          // outside gas
 333          // security for inside mother volume
 334          bpar[0] = (iChamber->ROuter() - iChamber->RInner())
 335            * TMath::Cos(TMath::ASin(dframep1 /
 336                                    (iChamber->ROuter() - iChamber->RInner())))
 337            / 2.0;
 338          bpar[1] = dframep1/2;
 339          // total thickness will be (4 * bpar[2]) for each chamber,
 340          // which has to be equal to (2 * dframez) - DAlu
 341          bpar[2] = (2.0 * dframez - iChamber->DAlu()) / 4.0;
 342          gMC->Gsvolu("S03B", "BOX", idAlu1, bpar, 3);
 343          gMC->Gsvolu("S04B", "BOX", idAlu1, bpar, 3);
 344
 345          gMC->Gspos("S03B",1,"S03M", +iChamber->RInner()+bpar[0] , 0,-zfpos,
 346                     irot1,"ONLY");
 347          gMC->Gspos("S03B",2,"S03M", -iChamber->RInner()-bpar[0] , 0,-zfpos,
 348                     irot1,"ONLY");
 349          gMC->Gspos("S03B",3,"S03M", 0, +iChamber->RInner()+bpar[0] ,-zfpos,
 350                     irot2,"ONLY");
 351          gMC->Gspos("S03B",4,"S03M", 0, -iChamber->RInner()-bpar[0] ,-zfpos,
 352                     irot2,"ONLY");
 353          gMC->Gspos("S03B",5,"S03M", +iChamber->RInner()+bpar[0] , 0,+zfpos,
 354                     irot1,"ONLY");
 355          gMC->Gspos("S03B",6,"S03M", -iChamber->RInner()-bpar[0] , 0,+zfpos,
 356                     irot1,"ONLY");
 357          gMC->Gspos("S03B",7,"S03M", 0, +iChamber->RInner()+bpar[0] ,+zfpos,
 358                     irot2,"ONLY");
 359          gMC->Gspos("S03B",8,"S03M", 0, -iChamber->RInner()-bpar[0] ,+zfpos,
 360                     irot2,"ONLY");
 361
 362          gMC->Gspos("S04B",1,"S04M", +iChamber->RInner()+bpar[0] , 0,-zfpos,
 363                     irot1,"ONLY");
 364          gMC->Gspos("S04B",2,"S04M", -iChamber->RInner()-bpar[0] , 0,-zfpos,
 365                     irot1,"ONLY");
 366          gMC->Gspos("S04B",3,"S04M", 0, +iChamber->RInner()+bpar[0] ,-zfpos,
 367                     irot2,"ONLY");
 368          gMC->Gspos("S04B",4,"S04M", 0, -iChamber->RInner()-bpar[0] ,-zfpos,
 369                     irot2,"ONLY");
 370          gMC->Gspos("S04B",5,"S04M", +iChamber->RInner()+bpar[0] , 0,+zfpos,
 371                     irot1,"ONLY");
 372          gMC->Gspos("S04B",6,"S04M", -iChamber->RInner()-bpar[0] , 0,+zfpos,
 373                     irot1,"ONLY");
 374          gMC->Gspos("S04B",7,"S04M", 0, +iChamber->RInner()+bpar[0] ,+zfpos,
 375                     irot2,"ONLY");
 376          gMC->Gspos("S04B",8,"S04M", 0, -iChamber->RInner()-bpar[0] ,+zfpos,
 377                     irot2,"ONLY");
 378      }
 379 //
 380 //   Chamber Material represented by Alu sheet
 381      tpar[0]= iChamber->RInner();
 382      tpar[1]= iChamber->ROuter();
 383      tpar[2] = (iChamber->DGas()+iChamber->DAlu())/2;
 384      gMC->Gsvolu("S03A", "TUBE", idAlu2, tpar, 3);
 385      gMC->Gsvolu("S04A", "TUBE", idAlu2, tpar, 3);
 386      gMC->Gspos("S03A", 1, "S03M", 0., 0., 0.,  0, "ONLY");
 387      gMC->Gspos("S04A", 1, "S04M", 0., 0., 0.,  0, "ONLY");
 388 //
 389 //   Sensitive volumes
 390      // tpar[2] = iChamber->DGas();
 391      tpar[2] = iChamber->DGas()/2;
 392      gMC->Gsvolu("S03G", "TUBE", idGas, tpar, 3);
 393      gMC->Gsvolu("S04G", "TUBE", idGas, tpar, 3);
 394      gMC->Gspos("S03G", 1, "S03A", 0., 0., 0.,  0, "ONLY");
 395      gMC->Gspos("S04G", 1, "S04A", 0., 0., 0.,  0, "ONLY");
 396 //
 397 // Frame Crosses to be placed inside gas
 398      // NONE: chambers are sensitive everywhere
 399 //      if (frameCrosses) {
 400
 401 //       dr = (iChamber->ROuter() - iChamber->RInner());
 402 //       bpar[0] = TMath::Sqrt(dr*dr-dframep1*dframep1/4)/2;
 403 //       bpar[1] = dframep1/2;
 404 //       bpar[2] = iChamber->DGas()/2;
 405 //       gMC->Gsvolu("S03F", "BOX", idAlu1, bpar, 3);
 406 //       gMC->Gsvolu("S04F", "BOX", idAlu1, bpar, 3);
 407
 408 //       gMC->Gspos("S03F",1,"S03G", +iChamber->RInner()+bpar[0] , 0, 0,
 409 //                  irot1,"ONLY");
 410 //       gMC->Gspos("S03F",2,"S03G", -iChamber->RInner()-bpar[0] , 0, 0,
 411 //                  irot1,"ONLY");
 412 //       gMC->Gspos("S03F",3,"S03G", 0, +iChamber->RInner()+bpar[0] , 0,
 413 //                  irot2,"ONLY");
 414 //       gMC->Gspos("S03F",4,"S03G", 0, -iChamber->RInner()-bpar[0] , 0,
 415 //                  irot2,"ONLY");
 416
 417 //       gMC->Gspos("S04F",1,"S04G", +iChamber->RInner()+bpar[0] , 0, 0,
 418 //                  irot1,"ONLY");
 419 //       gMC->Gspos("S04F",2,"S04G", -iChamber->RInner()-bpar[0] , 0, 0,
 420 //                  irot1,"ONLY");
 421 //       gMC->Gspos("S04F",3,"S04G", 0, +iChamber->RInner()+bpar[0] , 0,
 422 //                  irot2,"ONLY");
 423 //       gMC->Gspos("S04F",4,"S04G", 0, -iChamber->RInner()-bpar[0] , 0,
 424 //                  irot2,"ONLY");
 425 //      }
 426      }
 427 */
 428 }
 429
 430 //______________________________________________________________________________
 431 void AliMUONSt2GeometryBuilder::SetTransformations()
 432 {
 433 // Defines the transformations for the station2 chambers.
 434 // ---
 435
 436   AliMUONChamber* iChamber1 = GetChamber(2);
 437   Double_t zpos1 = - iChamber1->Z();
 438   iChamber1->GetGeometry()
 439     ->SetTranslation(TGeoTranslation(0., 0., zpos1));
 440
 441   AliMUONChamber* iChamber2 = GetChamber(3);
 442   Double_t zpos2 = - iChamber2->Z();
 443   iChamber2->GetGeometry()
 444     ->SetTranslation(TGeoTranslation(0., 0., zpos2));
 445 }
 446
 447 //______________________________________________________________________________
 448 void AliMUONSt2GeometryBuilder::SetSensitiveVolumes()
 449 {
 450 // Defines the sensitive volumes for station2 chambers.
 451 // ---
 452
 453   GetChamber(2)->GetGeometry()->SetSensitiveVolume("S03G");
 454   GetChamber(3)->GetGeometry()->SetSensitiveVolume("S04G");
 455 }