MUON/AliMUONSt2GeometryBuilder.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.              *
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  11  * appear in the supporting documentation. The authors make no claims     *
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  13  * provided "as is" without express or implied warranty.                  *
  14  **************************************************************************/
  15
  16 // $Id$
  17 //
  18 // Class AliMUONSt2GeometryBuilder
  19 // -------------------------------
  20 // MUON Station2 coarse geometry construction class.
  21 // Extracted from AliMUONv1
  22 // by Ivana Hrivnacova, IPN Orsay
  23 // Included in AliRoot 2004/01/23
  24
  25 #include <TVirtualMC.h>
  26 #include <TGeoMatrix.h>
  27
  28 #include "AliLog.h"
  29
  30 #include "AliMUONSt2GeometryBuilder.h"
  31 #include "AliMUON.h"
  32 #include "AliMUONChamber.h"
  33 #include "AliMUONGeometryModule.h"
  34 #include "AliMUONGeometryEnvelopeStore.h"
  35
  36 ClassImp(AliMUONSt2GeometryBuilder)
  37
  38 //______________________________________________________________________________
  39 AliMUONSt2GeometryBuilder::AliMUONSt2GeometryBuilder(AliMUON* muon)
  40  : AliMUONVGeometryBuilder("st2.dat",
  41                            muon->Chamber(2).GetGeometry(),
  42                            muon->Chamber(3).GetGeometry()),
  43    fMUON(muon)
  44 {
  45 // Standard constructor
  46
  47 }
  48
  49 //______________________________________________________________________________
  50 AliMUONSt2GeometryBuilder::AliMUONSt2GeometryBuilder()
  51  : AliMUONVGeometryBuilder(),
  52    fMUON(0)
  53 {
  54 // Default constructor
  55 }
  56
  57
  58 //______________________________________________________________________________
  59 AliMUONSt2GeometryBuilder::AliMUONSt2GeometryBuilder(const AliMUONSt2GeometryBuilder& rhs)
  60   : AliMUONVGeometryBuilder(rhs)
  61 {
  62 // Protected copy constructor
  63
  64   AliFatal("Copy constructor is not implemented.");
  65 }
  66
  67 //______________________________________________________________________________
  68 AliMUONSt2GeometryBuilder::~AliMUONSt2GeometryBuilder() {
  69 //
  70 }
  71
  72 //______________________________________________________________________________
  73 AliMUONSt2GeometryBuilder&
  74 AliMUONSt2GeometryBuilder::operator = (const AliMUONSt2GeometryBuilder& rhs)
  75 {
  76 // Protected assignement operator
  77
  78   // check assignement to self
  79   if (this == &rhs) return *this;
  80
  81   AliFatal("Assignment operator is not implemented.");
  82
  83   return *this;
  84 }
  85
  86 //
  87 // public methods
  88 //
  89
  90 //______________________________________________________________________________
  91 void AliMUONSt2GeometryBuilder::CreateGeometry()
  92 {
  93 // From AliMUONv1::CreateGeometry()
  94
  95 //
  96 //********************************************************************
  97 //                            Station 2                             **
  98 //********************************************************************
  99      // indices 1 and 2 for first and second chambers in the station
 100      // iChamber (first chamber) kept for other quanties than Z,
 101      // assumed to be the same in both chambers
 102
 103      // Get tracking medias Ids
 104      Int_t *idtmed = fMUON->GetIdtmed()->GetArray()-1099;
 105      Int_t idAir= idtmed[1100]; // medium 1
 106      Int_t idAlu1=idtmed[1103]; // medium 4
 107      Int_t idAlu2=idtmed[1104]; // medium 5
 108      Int_t idGas=idtmed[1108];  // medium 9 = Ar-CO2 gas (80%+20%)
 109      Bool_t frameCrosses=kTRUE;
 110
 111      // Rotation matrices in the x-y plane
 112      // phi= 0 deg
 113      Int_t irot1;
 114      fMUON->AliMatrix(irot1,  90.,   0., 90.,  90., 0., 0.);
 115      // phi= 90 deg
 116      Int_t irot2;
 117      fMUON->AliMatrix(irot2,  90.,  90., 90., 180., 0., 0.);
 118
 119      AliMUONChamber* iChamber = &fMUON->Chamber(2);
 120      AliMUONChamber* iChamber1 = iChamber;
 121      AliMUONChamber* iChamber2 = &fMUON->Chamber(3);
 122
 123      // Half of the total thickness of frame crosses (including DAlu)
 124      // for each chamber in stations 1 and 2:
 125      // 3% of X0 of composite material,
 126      // but taken as Aluminium here, with same thickness in number of X0
 127      Float_t dframez = 3. * 8.9 / 100;
 128      // DGas and DAlu not changed from standard values
 129      Double_t zfpos=-(iChamber->DGas()+dframez+iChamber->DAlu())/2;
 130              // The same parameters are defined in builder for station 1
 131
 132      // Mother volume
 133      // Outer excess and inner recess for mother volume radius
 134      // with respect to ROuter and RInner
 135      Float_t dframep=.001; // Value for station 3 should be 6 ...
 136      // Width (RdPhi) of the frame crosses for stations 1 and 2 (cm)
 137      // Float_t dframep1=.001;
 138      Float_t phi=2*TMath::Pi()/12/2;
 139              // The same parameters are defined in builder for station 1
 140
 141      Float_t tpar[3];
 142      Double_t dstation = (-iChamber2->Z()) - (-iChamber1->Z());
 143      tpar[0] = iChamber->RInner()-dframep;
 144      tpar[1] = (iChamber->ROuter()+dframep)/TMath::Cos(phi);
 145      tpar[2] = dstation/5;
 146
 147      gMC->Gsvolu("S03M", "TUBE", idAir, tpar, 3);
 148      gMC->Gsvolu("S04M", "TUBE", idAir, tpar, 3);
 149
 150      // CHANGED
 151      //gMC->Gspos("S03M", 1, "ALIC", 0., 0., zpos1 , 0, "ONLY");
 152      //gMC->Gspos("S04M", 1, "ALIC", 0., 0., zpos2 , 0, "ONLY");
 153
 154      GetEnvelopes(2)->AddEnvelope("S03M", 300, false);
 155      GetEnvelopes(3)->AddEnvelope("S04M", 400, false);
 156
 157      gMC->Gsbool("S03M", "L3DO");
 158      gMC->Gsbool("S03M", "L3O1");
 159      gMC->Gsbool("S03M", "L3O2");
 160      gMC->Gsbool("S04M", "L3DO");
 161      gMC->Gsbool("S04M", "L3O1");
 162      gMC->Gsbool("S04M", "L3O2");
 163
 164 // // Aluminium frames
 165 // // Outer frames
 166 //      pgpar[0] = 360/12/2;
 167 //      pgpar[1] = 360.;
 168 //      pgpar[2] = 12.;
 169 //      pgpar[3] =   2;
 170 //      pgpar[4] = -dframez/2;
 171 //      pgpar[5] = iChamber->ROuter();
 172 //      pgpar[6] = pgpar[5]+dframep;
 173 //      pgpar[7] = +dframez/2;
 174 //      pgpar[8] = pgpar[5];
 175 //      pgpar[9] = pgpar[6];
 176 //      gMC->Gsvolu("S03O", "PGON", idAlu1, pgpar, 10);
 177 //      gMC->Gsvolu("S04O", "PGON", idAlu1, pgpar, 10);
 178 //      gMC->Gspos("S03O",1,"S03M", 0.,0.,-zfpos,  0,"ONLY");
 179 //      gMC->Gspos("S03O",2,"S03M", 0.,0.,+zfpos,  0,"ONLY");
 180 //      gMC->Gspos("S04O",1,"S04M", 0.,0.,-zfpos,  0,"ONLY");
 181 //      gMC->Gspos("S04O",2,"S04M", 0.,0.,+zfpos,  0,"ONLY");
 182 // //
 183 // // Inner frame
 184 //      tpar[0]= iChamber->RInner()-dframep;
 185 //      tpar[1]= iChamber->RInner();
 186 //      tpar[2]= dframez/2;
 187 //      gMC->Gsvolu("S03I", "TUBE", idAlu1, tpar, 3);
 188 //      gMC->Gsvolu("S04I", "TUBE", idAlu1, tpar, 3);
 189
 190 //      gMC->Gspos("S03I",1,"S03M", 0.,0.,-zfpos,  0,"ONLY");
 191 //      gMC->Gspos("S03I",2,"S03M", 0.,0.,+zfpos,  0,"ONLY");
 192 //      gMC->Gspos("S04I",1,"S04M", 0.,0.,-zfpos,  0,"ONLY");
 193 //      gMC->Gspos("S04I",2,"S04M", 0.,0.,+zfpos,  0,"ONLY");
 194 //
 195 // Frame Crosses
 196      if (frameCrosses) {
 197          // outside gas
 198          // security for inside mother volume
 199
 200          // ADDED !! Repeated
 201          Float_t dframep1 = 11.0;
 202          Float_t dframez = 3. * 8.9 / 100;
 203
 204          Float_t bpar[3];
 205          bpar[0] = (iChamber->ROuter() - iChamber->RInner())
 206            * TMath::Cos(TMath::ASin(dframep1 /
 207                                    (iChamber->ROuter() - iChamber->RInner())))
 208            / 2.0;
 209          bpar[1] = dframep1/2;
 210          // total thickness will be (4 * bpar[2]) for each chamber,
 211          // which has to be equal to (2 * dframez) - DAlu
 212          bpar[2] = (2.0 * dframez - iChamber->DAlu()) / 4.0;
 213          gMC->Gsvolu("S03B", "BOX", idAlu1, bpar, 3);
 214          gMC->Gsvolu("S04B", "BOX", idAlu1, bpar, 3);
 215
 216          gMC->Gspos("S03B",1,"S03M", +iChamber->RInner()+bpar[0] , 0,-zfpos,
 217                     irot1,"ONLY");
 218          gMC->Gspos("S03B",2,"S03M", -iChamber->RInner()-bpar[0] , 0,-zfpos,
 219                     irot1,"ONLY");
 220          gMC->Gspos("S03B",3,"S03M", 0, +iChamber->RInner()+bpar[0] ,-zfpos,
 221                     irot2,"ONLY");
 222          gMC->Gspos("S03B",4,"S03M", 0, -iChamber->RInner()-bpar[0] ,-zfpos,
 223                     irot2,"ONLY");
 224          gMC->Gspos("S03B",5,"S03M", +iChamber->RInner()+bpar[0] , 0,+zfpos,
 225                     irot1,"ONLY");
 226          gMC->Gspos("S03B",6,"S03M", -iChamber->RInner()-bpar[0] , 0,+zfpos,
 227                     irot1,"ONLY");
 228          gMC->Gspos("S03B",7,"S03M", 0, +iChamber->RInner()+bpar[0] ,+zfpos,
 229                     irot2,"ONLY");
 230          gMC->Gspos("S03B",8,"S03M", 0, -iChamber->RInner()-bpar[0] ,+zfpos,
 231                     irot2,"ONLY");
 232
 233          gMC->Gspos("S04B",1,"S04M", +iChamber->RInner()+bpar[0] , 0,-zfpos,
 234                     irot1,"ONLY");
 235          gMC->Gspos("S04B",2,"S04M", -iChamber->RInner()-bpar[0] , 0,-zfpos,
 236                     irot1,"ONLY");
 237          gMC->Gspos("S04B",3,"S04M", 0, +iChamber->RInner()+bpar[0] ,-zfpos,
 238                     irot2,"ONLY");
 239          gMC->Gspos("S04B",4,"S04M", 0, -iChamber->RInner()-bpar[0] ,-zfpos,
 240                     irot2,"ONLY");
 241          gMC->Gspos("S04B",5,"S04M", +iChamber->RInner()+bpar[0] , 0,+zfpos,
 242                     irot1,"ONLY");
 243          gMC->Gspos("S04B",6,"S04M", -iChamber->RInner()-bpar[0] , 0,+zfpos,
 244                     irot1,"ONLY");
 245          gMC->Gspos("S04B",7,"S04M", 0, +iChamber->RInner()+bpar[0] ,+zfpos,
 246                     irot2,"ONLY");
 247          gMC->Gspos("S04B",8,"S04M", 0, -iChamber->RInner()-bpar[0] ,+zfpos,
 248                     irot2,"ONLY");
 249      }
 250 //
 251 //   Chamber Material represented by Alu sheet
 252      tpar[0]= iChamber->RInner();
 253      tpar[1]= iChamber->ROuter();
 254      tpar[2] = (iChamber->DGas()+iChamber->DAlu())/2;
 255      gMC->Gsvolu("S03A", "TUBE", idAlu2, tpar, 3);
 256      gMC->Gsvolu("S04A", "TUBE", idAlu2, tpar, 3);
 257      gMC->Gspos("S03A", 1, "S03M", 0., 0., 0.,  0, "ONLY");
 258      gMC->Gspos("S04A", 1, "S04M", 0., 0., 0.,  0, "ONLY");
 259 //
 260 //   Sensitive volumes
 261      // tpar[2] = iChamber->DGas();
 262      tpar[2] = iChamber->DGas()/2;
 263      gMC->Gsvolu("S03G", "TUBE", idGas, tpar, 3);
 264      gMC->Gsvolu("S04G", "TUBE", idGas, tpar, 3);
 265      gMC->Gspos("S03G", 1, "S03A", 0., 0., 0.,  0, "ONLY");
 266      gMC->Gspos("S04G", 1, "S04A", 0., 0., 0.,  0, "ONLY");
 267 //
 268 // Frame Crosses to be placed inside gas
 269      // NONE: chambers are sensitive everywhere
 270 //      if (frameCrosses) {
 271
 272 //       dr = (iChamber->ROuter() - iChamber->RInner());
 273 //       bpar[0] = TMath::Sqrt(dr*dr-dframep1*dframep1/4)/2;
 274 //       bpar[1] = dframep1/2;
 275 //       bpar[2] = iChamber->DGas()/2;
 276 //       gMC->Gsvolu("S03F", "BOX", idAlu1, bpar, 3);
 277 //       gMC->Gsvolu("S04F", "BOX", idAlu1, bpar, 3);
 278
 279 //       gMC->Gspos("S03F",1,"S03G", +iChamber->RInner()+bpar[0] , 0, 0,
 280 //                  irot1,"ONLY");
 281 //       gMC->Gspos("S03F",2,"S03G", -iChamber->RInner()-bpar[0] , 0, 0,
 282 //                  irot1,"ONLY");
 283 //       gMC->Gspos("S03F",3,"S03G", 0, +iChamber->RInner()+bpar[0] , 0,
 284 //                  irot2,"ONLY");
 285 //       gMC->Gspos("S03F",4,"S03G", 0, -iChamber->RInner()-bpar[0] , 0,
 286 //                  irot2,"ONLY");
 287
 288 //       gMC->Gspos("S04F",1,"S04G", +iChamber->RInner()+bpar[0] , 0, 0,
 289 //                  irot1,"ONLY");
 290 //       gMC->Gspos("S04F",2,"S04G", -iChamber->RInner()-bpar[0] , 0, 0,
 291 //                  irot1,"ONLY");
 292 //       gMC->Gspos("S04F",3,"S04G", 0, +iChamber->RInner()+bpar[0] , 0,
 293 //                  irot2,"ONLY");
 294 //       gMC->Gspos("S04F",4,"S04G", 0, -iChamber->RInner()-bpar[0] , 0,
 295 //                  irot2,"ONLY");
 296 //      }
 297 /*
 298      iChamber1 = iChamber = (AliMUONChamber*) (*fChambers)[2];
 299      iChamber2 =(AliMUONChamber*) (*fChambers)[3];
 300      zpos1=iChamber1->Z();
 301      zpos2=iChamber2->Z();
 302      dstation = zpos2 - zpos1;
 303      // DGas and DAlu not changed from standard values
 304      zfpos=-(iChamber->DGas()+dframez+iChamber->DAlu())/2;
 305
 306 //
 307 //   Mother volume
 308      tpar[0] = iChamber->RInner()-dframep;
 309      tpar[1] = (iChamber->ROuter()+dframep)/TMath::Cos(phi);
 310      tpar[2] = dstation/5;
 311
 312      gMC->Gsvolu("S03M", "TUBE", idAir, tpar, 3);
 313      gMC->Gsvolu("S04M", "TUBE", idAir, tpar, 3);
 314      gMC->Gspos("S03M", 1, "ALIC", 0., 0., zpos1 , 0, "ONLY");
 315      gMC->Gspos("S04M", 1, "ALIC", 0., 0., zpos2 , 0, "ONLY");
 316      gMC->Gsbool("S03M", "L3DO");
 317      gMC->Gsbool("S03M", "L3O1");
 318      gMC->Gsbool("S03M", "L3O2");
 319      gMC->Gsbool("S04M", "L3DO");
 320      gMC->Gsbool("S04M", "L3O1");
 321      gMC->Gsbool("S04M", "L3O2");
 322
 323 // // Aluminium frames
 324 // // Outer frames
 325 //      pgpar[0] = 360/12/2;
 326 //      pgpar[1] = 360.;
 327 //      pgpar[2] = 12.;
 328 //      pgpar[3] =   2;
 329 //      pgpar[4] = -dframez/2;
 330 //      pgpar[5] = iChamber->ROuter();
 331 //      pgpar[6] = pgpar[5]+dframep;
 332 //      pgpar[7] = +dframez/2;
 333 //      pgpar[8] = pgpar[5];
 334 //      pgpar[9] = pgpar[6];
 335 //      gMC->Gsvolu("S03O", "PGON", idAlu1, pgpar, 10);
 336 //      gMC->Gsvolu("S04O", "PGON", idAlu1, pgpar, 10);
 337 //      gMC->Gspos("S03O",1,"S03M", 0.,0.,-zfpos,  0,"ONLY");
 338 //      gMC->Gspos("S03O",2,"S03M", 0.,0.,+zfpos,  0,"ONLY");
 339 //      gMC->Gspos("S04O",1,"S04M", 0.,0.,-zfpos,  0,"ONLY");
 340 //      gMC->Gspos("S04O",2,"S04M", 0.,0.,+zfpos,  0,"ONLY");
 341 // //
 342 // // Inner frame
 343 //      tpar[0]= iChamber->RInner()-dframep;
 344 //      tpar[1]= iChamber->RInner();
 345 //      tpar[2]= dframez/2;
 346 //      gMC->Gsvolu("S03I", "TUBE", idAlu1, tpar, 3);
 347 //      gMC->Gsvolu("S04I", "TUBE", idAlu1, tpar, 3);
 348
 349 //      gMC->Gspos("S03I",1,"S03M", 0.,0.,-zfpos,  0,"ONLY");
 350 //      gMC->Gspos("S03I",2,"S03M", 0.,0.,+zfpos,  0,"ONLY");
 351 //      gMC->Gspos("S04I",1,"S04M", 0.,0.,-zfpos,  0,"ONLY");
 352 //      gMC->Gspos("S04I",2,"S04M", 0.,0.,+zfpos,  0,"ONLY");
 353 //
 354 // Frame Crosses
 355      if (frameCrosses) {
 356          // outside gas
 357          // security for inside mother volume
 358          bpar[0] = (iChamber->ROuter() - iChamber->RInner())
 359            * TMath::Cos(TMath::ASin(dframep1 /
 360                                    (iChamber->ROuter() - iChamber->RInner())))
 361            / 2.0;
 362          bpar[1] = dframep1/2;
 363          // total thickness will be (4 * bpar[2]) for each chamber,
 364          // which has to be equal to (2 * dframez) - DAlu
 365          bpar[2] = (2.0 * dframez - iChamber->DAlu()) / 4.0;
 366          gMC->Gsvolu("S03B", "BOX", idAlu1, bpar, 3);
 367          gMC->Gsvolu("S04B", "BOX", idAlu1, bpar, 3);
 368
 369          gMC->Gspos("S03B",1,"S03M", +iChamber->RInner()+bpar[0] , 0,-zfpos,
 370                     irot1,"ONLY");
 371          gMC->Gspos("S03B",2,"S03M", -iChamber->RInner()-bpar[0] , 0,-zfpos,
 372                     irot1,"ONLY");
 373          gMC->Gspos("S03B",3,"S03M", 0, +iChamber->RInner()+bpar[0] ,-zfpos,
 374                     irot2,"ONLY");
 375          gMC->Gspos("S03B",4,"S03M", 0, -iChamber->RInner()-bpar[0] ,-zfpos,
 376                     irot2,"ONLY");
 377          gMC->Gspos("S03B",5,"S03M", +iChamber->RInner()+bpar[0] , 0,+zfpos,
 378                     irot1,"ONLY");
 379          gMC->Gspos("S03B",6,"S03M", -iChamber->RInner()-bpar[0] , 0,+zfpos,
 380                     irot1,"ONLY");
 381          gMC->Gspos("S03B",7,"S03M", 0, +iChamber->RInner()+bpar[0] ,+zfpos,
 382                     irot2,"ONLY");
 383          gMC->Gspos("S03B",8,"S03M", 0, -iChamber->RInner()-bpar[0] ,+zfpos,
 384                     irot2,"ONLY");
 385
 386          gMC->Gspos("S04B",1,"S04M", +iChamber->RInner()+bpar[0] , 0,-zfpos,
 387                     irot1,"ONLY");
 388          gMC->Gspos("S04B",2,"S04M", -iChamber->RInner()-bpar[0] , 0,-zfpos,
 389                     irot1,"ONLY");
 390          gMC->Gspos("S04B",3,"S04M", 0, +iChamber->RInner()+bpar[0] ,-zfpos,
 391                     irot2,"ONLY");
 392          gMC->Gspos("S04B",4,"S04M", 0, -iChamber->RInner()-bpar[0] ,-zfpos,
 393                     irot2,"ONLY");
 394          gMC->Gspos("S04B",5,"S04M", +iChamber->RInner()+bpar[0] , 0,+zfpos,
 395                     irot1,"ONLY");
 396          gMC->Gspos("S04B",6,"S04M", -iChamber->RInner()-bpar[0] , 0,+zfpos,
 397                     irot1,"ONLY");
 398          gMC->Gspos("S04B",7,"S04M", 0, +iChamber->RInner()+bpar[0] ,+zfpos,
 399                     irot2,"ONLY");
 400          gMC->Gspos("S04B",8,"S04M", 0, -iChamber->RInner()-bpar[0] ,+zfpos,
 401                     irot2,"ONLY");
 402      }
 403 //
 404 //   Chamber Material represented by Alu sheet
 405      tpar[0]= iChamber->RInner();
 406      tpar[1]= iChamber->ROuter();
 407      tpar[2] = (iChamber->DGas()+iChamber->DAlu())/2;
 408      gMC->Gsvolu("S03A", "TUBE", idAlu2, tpar, 3);
 409      gMC->Gsvolu("S04A", "TUBE", idAlu2, tpar, 3);
 410      gMC->Gspos("S03A", 1, "S03M", 0., 0., 0.,  0, "ONLY");
 411      gMC->Gspos("S04A", 1, "S04M", 0., 0., 0.,  0, "ONLY");
 412 //
 413 //   Sensitive volumes
 414      // tpar[2] = iChamber->DGas();
 415      tpar[2] = iChamber->DGas()/2;
 416      gMC->Gsvolu("S03G", "TUBE", idGas, tpar, 3);
 417      gMC->Gsvolu("S04G", "TUBE", idGas, tpar, 3);
 418      gMC->Gspos("S03G", 1, "S03A", 0., 0., 0.,  0, "ONLY");
 419      gMC->Gspos("S04G", 1, "S04A", 0., 0., 0.,  0, "ONLY");
 420 //
 421 // Frame Crosses to be placed inside gas
 422      // NONE: chambers are sensitive everywhere
 423 //      if (frameCrosses) {
 424
 425 //       dr = (iChamber->ROuter() - iChamber->RInner());
 426 //       bpar[0] = TMath::Sqrt(dr*dr-dframep1*dframep1/4)/2;
 427 //       bpar[1] = dframep1/2;
 428 //       bpar[2] = iChamber->DGas()/2;
 429 //       gMC->Gsvolu("S03F", "BOX", idAlu1, bpar, 3);
 430 //       gMC->Gsvolu("S04F", "BOX", idAlu1, bpar, 3);
 431
 432 //       gMC->Gspos("S03F",1,"S03G", +iChamber->RInner()+bpar[0] , 0, 0,
 433 //                  irot1,"ONLY");
 434 //       gMC->Gspos("S03F",2,"S03G", -iChamber->RInner()-bpar[0] , 0, 0,
 435 //                  irot1,"ONLY");
 436 //       gMC->Gspos("S03F",3,"S03G", 0, +iChamber->RInner()+bpar[0] , 0,
 437 //                  irot2,"ONLY");
 438 //       gMC->Gspos("S03F",4,"S03G", 0, -iChamber->RInner()-bpar[0] , 0,
 439 //                  irot2,"ONLY");
 440
 441 //       gMC->Gspos("S04F",1,"S04G", +iChamber->RInner()+bpar[0] , 0, 0,
 442 //                  irot1,"ONLY");
 443 //       gMC->Gspos("S04F",2,"S04G", -iChamber->RInner()-bpar[0] , 0, 0,
 444 //                  irot1,"ONLY");
 445 //       gMC->Gspos("S04F",3,"S04G", 0, +iChamber->RInner()+bpar[0] , 0,
 446 //                  irot2,"ONLY");
 447 //       gMC->Gspos("S04F",4,"S04G", 0, -iChamber->RInner()-bpar[0] , 0,
 448 //                  irot2,"ONLY");
 449 //      }
 450      }
 451 */
 452 }
 453
 454 //______________________________________________________________________________
 455 void AliMUONSt2GeometryBuilder::SetTransformations()
 456 {
 457 // Defines the transformations for the station2 chambers.
 458 // ---
 459
 460   AliMUONChamber* iChamber1 = &fMUON->Chamber(2);
 461   Double_t zpos1 = - iChamber1->Z();
 462   iChamber1->GetGeometry()
 463     ->SetTranslation(TGeoTranslation(0., 0., zpos1));
 464
 465   AliMUONChamber* iChamber2 = &fMUON->Chamber(3);
 466   Double_t zpos2 = - iChamber2->Z();
 467   iChamber2->GetGeometry()
 468     ->SetTranslation(TGeoTranslation(0., 0., zpos2));
 469 }
 470
 471 //______________________________________________________________________________
 472 void AliMUONSt2GeometryBuilder::SetSensitiveVolumes()
 473 {
 474 // Defines the sensitive volumes for station2 chambers.
 475 // ---
 476
 477   GetGeometry(2)->SetSensitiveVolume("S03G");
 478   GetGeometry(3)->SetSensitiveVolume("S04G");
 479 }