MUON/AliMUONSt2GeometryBuilder.cxx

   1 // $Id$
   2 //
   3 // Class AliMUONSt2GeometryBuilder
   4 // -------------------------------
   5 // MUON Station2 coarse geometry construction class.
   6 // Extracted from AliMUONv1
   7 // by Ivana Hrivnacova, IPN Orsay
   8 // Included in AliRoot 2004/01/23
   9
  10 #include <TVirtualMC.h>
  11 #include <TGeoMatrix.h>
  12
  13 #include "AliMUONSt2GeometryBuilder.h"
  14 #include "AliMUON.h"
  15 #include "AliMUONChamber.h"
  16 #include "AliMUONChamberGeometry.h"
  17
  18 ClassImp(AliMUONSt2GeometryBuilder)
  19
  20 //______________________________________________________________________________
  21 AliMUONSt2GeometryBuilder::AliMUONSt2GeometryBuilder(AliMUON* muon)
  22  : AliMUONVGeometryBuilder(&muon->Chamber(2), &muon->Chamber(3)),
  23    fMUON(muon)
  24 {
  25 // Standard constructor
  26
  27 }
  28
  29 //______________________________________________________________________________
  30 AliMUONSt2GeometryBuilder::AliMUONSt2GeometryBuilder()
  31  : AliMUONVGeometryBuilder(),
  32    fMUON(0)
  33 {
  34 // Default constructor
  35 }
  36
  37
  38 //______________________________________________________________________________
  39 AliMUONSt2GeometryBuilder::AliMUONSt2GeometryBuilder(const AliMUONSt2GeometryBuilder& rhs)
  40   : AliMUONVGeometryBuilder(rhs)
  41 {
  42   Fatal("Copy constructor",
  43         "Copy constructor is not implemented.");
  44 }
  45
  46 //______________________________________________________________________________
  47 AliMUONSt2GeometryBuilder::~AliMUONSt2GeometryBuilder() {
  48 //
  49 }
  50
  51 //______________________________________________________________________________
  52 AliMUONSt2GeometryBuilder&
  53 AliMUONSt2GeometryBuilder::operator = (const AliMUONSt2GeometryBuilder& rhs)
  54 {
  55   // check assignement to self
  56   if (this == &rhs) return *this;
  57
  58   Fatal("operator=",
  59         "Assignment operator is not implemented.");
  60
  61   return *this;
  62 }
  63
  64 //
  65 // public methods
  66 //
  67
  68 //______________________________________________________________________________
  69 void AliMUONSt2GeometryBuilder::CreateGeometry()
  70 {
  71 // From AliMUONv1::CreateGeometry()
  72
  73 //
  74 //********************************************************************
  75 //                            Station 2                             **
  76 //********************************************************************
  77      // indices 1 and 2 for first and second chambers in the station
  78      // iChamber (first chamber) kept for other quanties than Z,
  79      // assumed to be the same in both chambers
  80
  81      // Get tracking medias Ids
  82      Int_t *idtmed = fMUON->GetIdtmed()->GetArray()-1099;
  83      Int_t idAir= idtmed[1100]; // medium 1
  84      Int_t idAlu1=idtmed[1103]; // medium 4
  85      Int_t idAlu2=idtmed[1104]; // medium 5
  86      Int_t idGas=idtmed[1108];  // medium 9 = Ar-CO2 gas (80%+20%)
  87      Bool_t frameCrosses=kTRUE;
  88
  89      // Rotation matrices in the x-y plane
  90      // phi= 0 deg
  91      Int_t irot1;
  92      fMUON->AliMatrix(irot1,  90.,   0., 90.,  90., 0., 0.);
  93      // phi= 90 deg
  94      Int_t irot2;
  95      fMUON->AliMatrix(irot2,  90.,  90., 90., 180., 0., 0.);
  96
  97      AliMUONChamber* iChamber = GetChamber(2);
  98      AliMUONChamber* iChamber1 = iChamber;
  99      AliMUONChamber* iChamber2 = GetChamber(3);
 100
 101      // Half of the total thickness of frame crosses (including DAlu)
 102      // for each chamber in stations 1 and 2:
 103      // 3% of X0 of composite material,
 104      // but taken as Aluminium here, with same thickness in number of X0
 105      Float_t dframez = 3. * 8.9 / 100;
 106      // DGas and DAlu not changed from standard values
 107      Double_t zfpos=-(iChamber->DGas()+dframez+iChamber->DAlu())/2;
 108              // The same parameters are defined in builder for station 1
 109
 110      // Mother volume
 111      // Outer excess and inner recess for mother volume radius
 112      // with respect to ROuter and RInner
 113      Float_t dframep=.001; // Value for station 3 should be 6 ...
 114      // Width (RdPhi) of the frame crosses for stations 1 and 2 (cm)
 115      // Float_t dframep1=.001;
 116      Float_t phi=2*TMath::Pi()/12/2;
 117              // The same parameters are defined in builder for station 1
 118
 119      Float_t tpar[3];
 120      Double_t dstation = (-iChamber2->Z()) - (-iChamber1->Z());
 121      tpar[0] = iChamber->RInner()-dframep;
 122      tpar[1] = (iChamber->ROuter()+dframep)/TMath::Cos(phi);
 123      tpar[2] = dstation/5;
 124
 125      gMC->Gsvolu("S03M", "TUBE", idAir, tpar, 3);
 126      gMC->Gsvolu("S04M", "TUBE", idAir, tpar, 3);
 127
 128      // CHANGED
 129      //gMC->Gspos("S03M", 1, "ALIC", 0., 0., zpos1 , 0, "ONLY");
 130      //gMC->Gspos("S04M", 1, "ALIC", 0., 0., zpos2 , 0, "ONLY");
 131      GetChamber(2)->GetGeometry()->AddEnvelope("S03M", false);
 132      GetChamber(3)->GetGeometry()->AddEnvelope("S04M", false);
 133
 134      gMC->Gsbool("S03M", "L3DO");
 135      gMC->Gsbool("S03M", "L3O1");
 136      gMC->Gsbool("S03M", "L3O2");
 137      gMC->Gsbool("S04M", "L3DO");
 138      gMC->Gsbool("S04M", "L3O1");
 139      gMC->Gsbool("S04M", "L3O2");
 140
 141 // // Aluminium frames
 142 // // Outer frames
 143 //      pgpar[0] = 360/12/2;
 144 //      pgpar[1] = 360.;
 145 //      pgpar[2] = 12.;
 146 //      pgpar[3] =   2;
 147 //      pgpar[4] = -dframez/2;
 148 //      pgpar[5] = iChamber->ROuter();
 149 //      pgpar[6] = pgpar[5]+dframep;
 150 //      pgpar[7] = +dframez/2;
 151 //      pgpar[8] = pgpar[5];
 152 //      pgpar[9] = pgpar[6];
 153 //      gMC->Gsvolu("S03O", "PGON", idAlu1, pgpar, 10);
 154 //      gMC->Gsvolu("S04O", "PGON", idAlu1, pgpar, 10);
 155 //      gMC->Gspos("S03O",1,"S03M", 0.,0.,-zfpos,  0,"ONLY");
 156 //      gMC->Gspos("S03O",2,"S03M", 0.,0.,+zfpos,  0,"ONLY");
 157 //      gMC->Gspos("S04O",1,"S04M", 0.,0.,-zfpos,  0,"ONLY");
 158 //      gMC->Gspos("S04O",2,"S04M", 0.,0.,+zfpos,  0,"ONLY");
 159 // //
 160 // // Inner frame
 161 //      tpar[0]= iChamber->RInner()-dframep;
 162 //      tpar[1]= iChamber->RInner();
 163 //      tpar[2]= dframez/2;
 164 //      gMC->Gsvolu("S03I", "TUBE", idAlu1, tpar, 3);
 165 //      gMC->Gsvolu("S04I", "TUBE", idAlu1, tpar, 3);
 166
 167 //      gMC->Gspos("S03I",1,"S03M", 0.,0.,-zfpos,  0,"ONLY");
 168 //      gMC->Gspos("S03I",2,"S03M", 0.,0.,+zfpos,  0,"ONLY");
 169 //      gMC->Gspos("S04I",1,"S04M", 0.,0.,-zfpos,  0,"ONLY");
 170 //      gMC->Gspos("S04I",2,"S04M", 0.,0.,+zfpos,  0,"ONLY");
 171 //
 172 // Frame Crosses
 173      if (frameCrosses) {
 174          // outside gas
 175          // security for inside mother volume
 176
 177          // ADDED !! Repeated
 178          Float_t dframep1 = 11.0;
 179          Float_t dframez = 3. * 8.9 / 100;
 180
 181          Float_t bpar[3];
 182          bpar[0] = (iChamber->ROuter() - iChamber->RInner())
 183            * TMath::Cos(TMath::ASin(dframep1 /
 184                                    (iChamber->ROuter() - iChamber->RInner())))
 185            / 2.0;
 186          bpar[1] = dframep1/2;
 187          // total thickness will be (4 * bpar[2]) for each chamber,
 188          // which has to be equal to (2 * dframez) - DAlu
 189          bpar[2] = (2.0 * dframez - iChamber->DAlu()) / 4.0;
 190          gMC->Gsvolu("S03B", "BOX", idAlu1, bpar, 3);
 191          gMC->Gsvolu("S04B", "BOX", idAlu1, bpar, 3);
 192
 193          gMC->Gspos("S03B",1,"S03M", +iChamber->RInner()+bpar[0] , 0,-zfpos,
 194                     irot1,"ONLY");
 195          gMC->Gspos("S03B",2,"S03M", -iChamber->RInner()-bpar[0] , 0,-zfpos,
 196                     irot1,"ONLY");
 197          gMC->Gspos("S03B",3,"S03M", 0, +iChamber->RInner()+bpar[0] ,-zfpos,
 198                     irot2,"ONLY");
 199          gMC->Gspos("S03B",4,"S03M", 0, -iChamber->RInner()-bpar[0] ,-zfpos,
 200                     irot2,"ONLY");
 201          gMC->Gspos("S03B",5,"S03M", +iChamber->RInner()+bpar[0] , 0,+zfpos,
 202                     irot1,"ONLY");
 203          gMC->Gspos("S03B",6,"S03M", -iChamber->RInner()-bpar[0] , 0,+zfpos,
 204                     irot1,"ONLY");
 205          gMC->Gspos("S03B",7,"S03M", 0, +iChamber->RInner()+bpar[0] ,+zfpos,
 206                     irot2,"ONLY");
 207          gMC->Gspos("S03B",8,"S03M", 0, -iChamber->RInner()-bpar[0] ,+zfpos,
 208                     irot2,"ONLY");
 209
 210          gMC->Gspos("S04B",1,"S04M", +iChamber->RInner()+bpar[0] , 0,-zfpos,
 211                     irot1,"ONLY");
 212          gMC->Gspos("S04B",2,"S04M", -iChamber->RInner()-bpar[0] , 0,-zfpos,
 213                     irot1,"ONLY");
 214          gMC->Gspos("S04B",3,"S04M", 0, +iChamber->RInner()+bpar[0] ,-zfpos,
 215                     irot2,"ONLY");
 216          gMC->Gspos("S04B",4,"S04M", 0, -iChamber->RInner()-bpar[0] ,-zfpos,
 217                     irot2,"ONLY");
 218          gMC->Gspos("S04B",5,"S04M", +iChamber->RInner()+bpar[0] , 0,+zfpos,
 219                     irot1,"ONLY");
 220          gMC->Gspos("S04B",6,"S04M", -iChamber->RInner()-bpar[0] , 0,+zfpos,
 221                     irot1,"ONLY");
 222          gMC->Gspos("S04B",7,"S04M", 0, +iChamber->RInner()+bpar[0] ,+zfpos,
 223                     irot2,"ONLY");
 224          gMC->Gspos("S04B",8,"S04M", 0, -iChamber->RInner()-bpar[0] ,+zfpos,
 225                     irot2,"ONLY");
 226      }
 227 //
 228 //   Chamber Material represented by Alu sheet
 229      tpar[0]= iChamber->RInner();
 230      tpar[1]= iChamber->ROuter();
 231      tpar[2] = (iChamber->DGas()+iChamber->DAlu())/2;
 232      gMC->Gsvolu("S03A", "TUBE", idAlu2, tpar, 3);
 233      gMC->Gsvolu("S04A", "TUBE", idAlu2, tpar, 3);
 234      gMC->Gspos("S03A", 1, "S03M", 0., 0., 0.,  0, "ONLY");
 235      gMC->Gspos("S04A", 1, "S04M", 0., 0., 0.,  0, "ONLY");
 236 //
 237 //   Sensitive volumes
 238      // tpar[2] = iChamber->DGas();
 239      tpar[2] = iChamber->DGas()/2;
 240      gMC->Gsvolu("S03G", "TUBE", idGas, tpar, 3);
 241      gMC->Gsvolu("S04G", "TUBE", idGas, tpar, 3);
 242      gMC->Gspos("S03G", 1, "S03A", 0., 0., 0.,  0, "ONLY");
 243      gMC->Gspos("S04G", 1, "S04A", 0., 0., 0.,  0, "ONLY");
 244 //
 245 // Frame Crosses to be placed inside gas
 246      // NONE: chambers are sensitive everywhere
 247 //      if (frameCrosses) {
 248
 249 //       dr = (iChamber->ROuter() - iChamber->RInner());
 250 //       bpar[0] = TMath::Sqrt(dr*dr-dframep1*dframep1/4)/2;
 251 //       bpar[1] = dframep1/2;
 252 //       bpar[2] = iChamber->DGas()/2;
 253 //       gMC->Gsvolu("S03F", "BOX", idAlu1, bpar, 3);
 254 //       gMC->Gsvolu("S04F", "BOX", idAlu1, bpar, 3);
 255
 256 //       gMC->Gspos("S03F",1,"S03G", +iChamber->RInner()+bpar[0] , 0, 0,
 257 //                  irot1,"ONLY");
 258 //       gMC->Gspos("S03F",2,"S03G", -iChamber->RInner()-bpar[0] , 0, 0,
 259 //                  irot1,"ONLY");
 260 //       gMC->Gspos("S03F",3,"S03G", 0, +iChamber->RInner()+bpar[0] , 0,
 261 //                  irot2,"ONLY");
 262 //       gMC->Gspos("S03F",4,"S03G", 0, -iChamber->RInner()-bpar[0] , 0,
 263 //                  irot2,"ONLY");
 264
 265 //       gMC->Gspos("S04F",1,"S04G", +iChamber->RInner()+bpar[0] , 0, 0,
 266 //                  irot1,"ONLY");
 267 //       gMC->Gspos("S04F",2,"S04G", -iChamber->RInner()-bpar[0] , 0, 0,
 268 //                  irot1,"ONLY");
 269 //       gMC->Gspos("S04F",3,"S04G", 0, +iChamber->RInner()+bpar[0] , 0,
 270 //                  irot2,"ONLY");
 271 //       gMC->Gspos("S04F",4,"S04G", 0, -iChamber->RInner()-bpar[0] , 0,
 272 //                  irot2,"ONLY");
 273 //      }
 274 /*
 275      iChamber1 = iChamber = (AliMUONChamber*) (*fChambers)[2];
 276      iChamber2 =(AliMUONChamber*) (*fChambers)[3];
 277      zpos1=iChamber1->Z();
 278      zpos2=iChamber2->Z();
 279      dstation = zpos2 - zpos1;
 280      // DGas and DAlu not changed from standard values
 281      zfpos=-(iChamber->DGas()+dframez+iChamber->DAlu())/2;
 282
 283 //
 284 //   Mother volume
 285      tpar[0] = iChamber->RInner()-dframep;
 286      tpar[1] = (iChamber->ROuter()+dframep)/TMath::Cos(phi);
 287      tpar[2] = dstation/5;
 288
 289      gMC->Gsvolu("S03M", "TUBE", idAir, tpar, 3);
 290      gMC->Gsvolu("S04M", "TUBE", idAir, tpar, 3);
 291      gMC->Gspos("S03M", 1, "ALIC", 0., 0., zpos1 , 0, "ONLY");
 292      gMC->Gspos("S04M", 1, "ALIC", 0., 0., zpos2 , 0, "ONLY");
 293      gMC->Gsbool("S03M", "L3DO");
 294      gMC->Gsbool("S03M", "L3O1");
 295      gMC->Gsbool("S03M", "L3O2");
 296      gMC->Gsbool("S04M", "L3DO");
 297      gMC->Gsbool("S04M", "L3O1");
 298      gMC->Gsbool("S04M", "L3O2");
 299
 300 // // Aluminium frames
 301 // // Outer frames
 302 //      pgpar[0] = 360/12/2;
 303 //      pgpar[1] = 360.;
 304 //      pgpar[2] = 12.;
 305 //      pgpar[3] =   2;
 306 //      pgpar[4] = -dframez/2;
 307 //      pgpar[5] = iChamber->ROuter();
 308 //      pgpar[6] = pgpar[5]+dframep;
 309 //      pgpar[7] = +dframez/2;
 310 //      pgpar[8] = pgpar[5];
 311 //      pgpar[9] = pgpar[6];
 312 //      gMC->Gsvolu("S03O", "PGON", idAlu1, pgpar, 10);
 313 //      gMC->Gsvolu("S04O", "PGON", idAlu1, pgpar, 10);
 314 //      gMC->Gspos("S03O",1,"S03M", 0.,0.,-zfpos,  0,"ONLY");
 315 //      gMC->Gspos("S03O",2,"S03M", 0.,0.,+zfpos,  0,"ONLY");
 316 //      gMC->Gspos("S04O",1,"S04M", 0.,0.,-zfpos,  0,"ONLY");
 317 //      gMC->Gspos("S04O",2,"S04M", 0.,0.,+zfpos,  0,"ONLY");
 318 // //
 319 // // Inner frame
 320 //      tpar[0]= iChamber->RInner()-dframep;
 321 //      tpar[1]= iChamber->RInner();
 322 //      tpar[2]= dframez/2;
 323 //      gMC->Gsvolu("S03I", "TUBE", idAlu1, tpar, 3);
 324 //      gMC->Gsvolu("S04I", "TUBE", idAlu1, tpar, 3);
 325
 326 //      gMC->Gspos("S03I",1,"S03M", 0.,0.,-zfpos,  0,"ONLY");
 327 //      gMC->Gspos("S03I",2,"S03M", 0.,0.,+zfpos,  0,"ONLY");
 328 //      gMC->Gspos("S04I",1,"S04M", 0.,0.,-zfpos,  0,"ONLY");
 329 //      gMC->Gspos("S04I",2,"S04M", 0.,0.,+zfpos,  0,"ONLY");
 330 //
 331 // Frame Crosses
 332      if (frameCrosses) {
 333          // outside gas
 334          // security for inside mother volume
 335          bpar[0] = (iChamber->ROuter() - iChamber->RInner())
 336            * TMath::Cos(TMath::ASin(dframep1 /
 337                                    (iChamber->ROuter() - iChamber->RInner())))
 338            / 2.0;
 339          bpar[1] = dframep1/2;
 340          // total thickness will be (4 * bpar[2]) for each chamber,
 341          // which has to be equal to (2 * dframez) - DAlu
 342          bpar[2] = (2.0 * dframez - iChamber->DAlu()) / 4.0;
 343          gMC->Gsvolu("S03B", "BOX", idAlu1, bpar, 3);
 344          gMC->Gsvolu("S04B", "BOX", idAlu1, bpar, 3);
 345
 346          gMC->Gspos("S03B",1,"S03M", +iChamber->RInner()+bpar[0] , 0,-zfpos,
 347                     irot1,"ONLY");
 348          gMC->Gspos("S03B",2,"S03M", -iChamber->RInner()-bpar[0] , 0,-zfpos,
 349                     irot1,"ONLY");
 350          gMC->Gspos("S03B",3,"S03M", 0, +iChamber->RInner()+bpar[0] ,-zfpos,
 351                     irot2,"ONLY");
 352          gMC->Gspos("S03B",4,"S03M", 0, -iChamber->RInner()-bpar[0] ,-zfpos,
 353                     irot2,"ONLY");
 354          gMC->Gspos("S03B",5,"S03M", +iChamber->RInner()+bpar[0] , 0,+zfpos,
 355                     irot1,"ONLY");
 356          gMC->Gspos("S03B",6,"S03M", -iChamber->RInner()-bpar[0] , 0,+zfpos,
 357                     irot1,"ONLY");
 358          gMC->Gspos("S03B",7,"S03M", 0, +iChamber->RInner()+bpar[0] ,+zfpos,
 359                     irot2,"ONLY");
 360          gMC->Gspos("S03B",8,"S03M", 0, -iChamber->RInner()-bpar[0] ,+zfpos,
 361                     irot2,"ONLY");
 362
 363          gMC->Gspos("S04B",1,"S04M", +iChamber->RInner()+bpar[0] , 0,-zfpos,
 364                     irot1,"ONLY");
 365          gMC->Gspos("S04B",2,"S04M", -iChamber->RInner()-bpar[0] , 0,-zfpos,
 366                     irot1,"ONLY");
 367          gMC->Gspos("S04B",3,"S04M", 0, +iChamber->RInner()+bpar[0] ,-zfpos,
 368                     irot2,"ONLY");
 369          gMC->Gspos("S04B",4,"S04M", 0, -iChamber->RInner()-bpar[0] ,-zfpos,
 370                     irot2,"ONLY");
 371          gMC->Gspos("S04B",5,"S04M", +iChamber->RInner()+bpar[0] , 0,+zfpos,
 372                     irot1,"ONLY");
 373          gMC->Gspos("S04B",6,"S04M", -iChamber->RInner()-bpar[0] , 0,+zfpos,
 374                     irot1,"ONLY");
 375          gMC->Gspos("S04B",7,"S04M", 0, +iChamber->RInner()+bpar[0] ,+zfpos,
 376                     irot2,"ONLY");
 377          gMC->Gspos("S04B",8,"S04M", 0, -iChamber->RInner()-bpar[0] ,+zfpos,
 378                     irot2,"ONLY");
 379      }
 380 //
 381 //   Chamber Material represented by Alu sheet
 382      tpar[0]= iChamber->RInner();
 383      tpar[1]= iChamber->ROuter();
 384      tpar[2] = (iChamber->DGas()+iChamber->DAlu())/2;
 385      gMC->Gsvolu("S03A", "TUBE", idAlu2, tpar, 3);
 386      gMC->Gsvolu("S04A", "TUBE", idAlu2, tpar, 3);
 387      gMC->Gspos("S03A", 1, "S03M", 0., 0., 0.,  0, "ONLY");
 388      gMC->Gspos("S04A", 1, "S04M", 0., 0., 0.,  0, "ONLY");
 389 //
 390 //   Sensitive volumes
 391      // tpar[2] = iChamber->DGas();
 392      tpar[2] = iChamber->DGas()/2;
 393      gMC->Gsvolu("S03G", "TUBE", idGas, tpar, 3);
 394      gMC->Gsvolu("S04G", "TUBE", idGas, tpar, 3);
 395      gMC->Gspos("S03G", 1, "S03A", 0., 0., 0.,  0, "ONLY");
 396      gMC->Gspos("S04G", 1, "S04A", 0., 0., 0.,  0, "ONLY");
 397 //
 398 // Frame Crosses to be placed inside gas
 399      // NONE: chambers are sensitive everywhere
 400 //      if (frameCrosses) {
 401
 402 //       dr = (iChamber->ROuter() - iChamber->RInner());
 403 //       bpar[0] = TMath::Sqrt(dr*dr-dframep1*dframep1/4)/2;
 404 //       bpar[1] = dframep1/2;
 405 //       bpar[2] = iChamber->DGas()/2;
 406 //       gMC->Gsvolu("S03F", "BOX", idAlu1, bpar, 3);
 407 //       gMC->Gsvolu("S04F", "BOX", idAlu1, bpar, 3);
 408
 409 //       gMC->Gspos("S03F",1,"S03G", +iChamber->RInner()+bpar[0] , 0, 0,
 410 //                  irot1,"ONLY");
 411 //       gMC->Gspos("S03F",2,"S03G", -iChamber->RInner()-bpar[0] , 0, 0,
 412 //                  irot1,"ONLY");
 413 //       gMC->Gspos("S03F",3,"S03G", 0, +iChamber->RInner()+bpar[0] , 0,
 414 //                  irot2,"ONLY");
 415 //       gMC->Gspos("S03F",4,"S03G", 0, -iChamber->RInner()-bpar[0] , 0,
 416 //                  irot2,"ONLY");
 417
 418 //       gMC->Gspos("S04F",1,"S04G", +iChamber->RInner()+bpar[0] , 0, 0,
 419 //                  irot1,"ONLY");
 420 //       gMC->Gspos("S04F",2,"S04G", -iChamber->RInner()-bpar[0] , 0, 0,
 421 //                  irot1,"ONLY");
 422 //       gMC->Gspos("S04F",3,"S04G", 0, +iChamber->RInner()+bpar[0] , 0,
 423 //                  irot2,"ONLY");
 424 //       gMC->Gspos("S04F",4,"S04G", 0, -iChamber->RInner()-bpar[0] , 0,
 425 //                  irot2,"ONLY");
 426 //      }
 427      }
 428 */
 429 }
 430
 431 //______________________________________________________________________________
 432 void AliMUONSt2GeometryBuilder::SetTransformations()
 433 {
 434 // Defines the transformations for the station2 chambers.
 435 // ---
 436
 437   AliMUONChamber* iChamber1 = GetChamber(2);
 438   Double_t zpos1 = - iChamber1->Z();
 439   iChamber1->GetGeometry()
 440     ->SetTranslation(TGeoTranslation(0., 0., zpos1));
 441
 442   AliMUONChamber* iChamber2 = GetChamber(3);
 443   Double_t zpos2 = - iChamber2->Z();
 444   iChamber2->GetGeometry()
 445     ->SetTranslation(TGeoTranslation(0., 0., zpos2));
 446 }
 447
 448 //______________________________________________________________________________
 449 void AliMUONSt2GeometryBuilder::SetSensitiveVolumes()
 450 {
 451 // Defines the sensitive volumes for station2 chambers.
 452 // ---
 453
 454   GetChamber(2)->GetGeometry()->SetSensitiveVolume("S03G");
 455   GetChamber(3)->GetGeometry()->SetSensitiveVolume("S04G");
 456 }