MUON/AliMUONSt1GeometryBuilder.cxx

   1 // $Id$
   2 //
   3 // Class AliMUONSt1GeometryBuilder
   4 // -------------------------------
   5 // MUON Station1 coarse geometry construction class.
   6 //
   7 // Extracted from AliMUONv1
   8 // by Ivana Hrivnacova, IPN Orsay
   9
  10 #include <TVirtualMC.h>
  11 #include <TGeoMatrix.h>
  12
  13 #include "AliMUONSt1GeometryBuilder.h"
  14 #include "AliMUON.h"
  15 #include "AliMUONChamber.h"
  16 #include "AliMUONChamberGeometry.h"
  17
  18 ClassImp(AliMUONSt1GeometryBuilder)
  19
  20 //______________________________________________________________________________
  21 AliMUONSt1GeometryBuilder::AliMUONSt1GeometryBuilder(AliMUON* muon)
  22  : AliMUONVGeometryBuilder(&muon->Chamber(0), &muon->Chamber(1)),
  23    fMUON(muon)
  24 {
  25 // Standard constructor
  26
  27 }
  28
  29 //______________________________________________________________________________
  30 AliMUONSt1GeometryBuilder::AliMUONSt1GeometryBuilder()
  31  : AliMUONVGeometryBuilder(),
  32    fMUON(0)
  33 {
  34 // Default constructor
  35 }
  36
  37
  38 //______________________________________________________________________________
  39 AliMUONSt1GeometryBuilder::AliMUONSt1GeometryBuilder(const AliMUONSt1GeometryBuilder& rhs)
  40   : AliMUONVGeometryBuilder(rhs)
  41 {
  42   Fatal("Copy constructor",
  43         "Copy constructor is not implemented.");
  44 }
  45
  46 //______________________________________________________________________________
  47 AliMUONSt1GeometryBuilder::~AliMUONSt1GeometryBuilder() {
  48 //
  49 }
  50
  51 //______________________________________________________________________________
  52 AliMUONSt1GeometryBuilder&
  53 AliMUONSt1GeometryBuilder::operator = (const AliMUONSt1GeometryBuilder& 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 AliMUONSt1GeometryBuilder::CreateGeometry()
  70 {
  71 // From AliMUONv1::CreateGeometry()
  72 // ---
  73
  74 //********************************************************************
  75 //                            Station 1                             **
  76 //********************************************************************
  77 //  CONCENTRIC
  78      // indices 1 and 2 for first and second chambers in the station
  79      // iChamber (first chamber) kept for other quanties than Z,
  80      // assumed to be the same in both chambers
  81
  82      // Get tracking medias Ids
  83      Int_t *idtmed = fMUON->GetIdtmed()->GetArray()-1099;
  84      Int_t idAir= idtmed[1100]; // medium 1
  85      Int_t idAlu1=idtmed[1103]; // medium 4
  86      Int_t idAlu2=idtmed[1104]; // medium 5
  87      Int_t idGas=idtmed[1108];  // medium 9 = Ar-CO2 gas (80%+20%)
  88      Bool_t frameCrosses=kTRUE;
  89
  90      // Rotation matrices in the x-y plane
  91      // phi=   0 deg
  92      Int_t irot1;
  93      fMUON->AliMatrix(irot1,  90.,   0., 90.,  90., 0., 0.);
  94      // phi=  90 deg
  95      Int_t irot2;
  96      fMUON->AliMatrix(irot2,  90.,  90., 90., 180., 0., 0.);
  97
  98      AliMUONChamber* iChamber1 = GetChamber(0);
  99      AliMUONChamber* iChamber2 = GetChamber(1);
 100      AliMUONChamber* iChamber = iChamber1;
 101
 102      // DGas decreased from standard one (0.5)
 103      iChamber->SetDGas(0.4);
 104      iChamber2->SetDGas(0.4);
 105
 106      // DAlu increased from standard one (3% of X0),
 107      // because more electronics with smaller pads
 108      iChamber->SetDAlu(3.5 * 8.9 / 100.);
 109      iChamber2->SetDAlu(3.5 * 8.9 / 100.);
 110
 111      // Half of the total thickness of frame crosses (including DAlu)
 112      // for each chamber in stations 1 and 2:
 113      // 3% of X0 of composite material,
 114      // but taken as Aluminium here, with same thickness in number of X0
 115      Float_t dframez = 3. * 8.9 / 100;
 116      Float_t zfpos=-(iChamber->DGas()+dframez+iChamber->DAlu())/2;
 117              // The same parameters are defined in builder for station 2
 118
 119      // Mother volume
 120      // Outer excess and inner recess for mother volume radius
 121      // with respect to ROuter and RInner
 122      Float_t dframep=.001; // Value for station 3 should be 6 ...
 123      // Width (RdPhi) of the frame crosses for stations 1 and 2 (cm)
 124      // Float_t dframep1=.001;
 125      Float_t dframep1 = 11.0;
 126      Float_t phi=2*TMath::Pi()/12/2;
 127              // The same parameters are defined in builder for station 2
 128
 129      Float_t tpar[3];
 130      Float_t dstation = (-iChamber2->Z()) - (-iChamber1->Z());
 131      tpar[0] = iChamber->RInner()-dframep;
 132      tpar[1] = (iChamber->ROuter()+dframep)/TMath::Cos(phi);
 133      tpar[2] = dstation/5;
 134
 135      gMC->Gsvolu("S01M", "TUBE", idAir, tpar, 3);
 136      gMC->Gsvolu("S02M", "TUBE", idAir, tpar, 3);
 137
 138      // CHANGED
 139      //gMC->Gspos("S01M", 1, "ALIC", 0., 0., zpos1 , 0, "ONLY");
 140      //gMC->Gspos("S02M", 1, "ALIC", 0., 0., zpos2 , 0, "ONLY");
 141      GetChamber(0)->GetGeometry()->AddEnvelope("S01M", false);
 142      GetChamber(1)->GetGeometry()->AddEnvelope("S02M", false);
 143
 144 // // Aluminium frames
 145 // // Outer frames
 146 //      pgpar[0] = 360/12/2;
 147 //      pgpar[1] = 360.;
 148 //      pgpar[2] = 12.;
 149 //      pgpar[3] =   2;
 150 //      pgpar[4] = -dframez/2;
 151 //      pgpar[5] = iChamber->ROuter();
 152 //      pgpar[6] = pgpar[5]+dframep1;
 153 //      pgpar[7] = +dframez/2;
 154 //      pgpar[8] = pgpar[5];
 155 //      pgpar[9] = pgpar[6];
 156 //      gMC->Gsvolu("S01O", "PGON", idAlu1, pgpar, 10);
 157 //      gMC->Gsvolu("S02O", "PGON", idAlu1, pgpar, 10);
 158 //      gMC->Gspos("S01O",1,"S01M", 0.,0.,-zfpos,  0,"ONLY");
 159 //      gMC->Gspos("S01O",2,"S01M", 0.,0.,+zfpos,  0,"ONLY");
 160 //      gMC->Gspos("S02O",1,"S02M", 0.,0.,-zfpos,  0,"ONLY");
 161 //      gMC->Gspos("S02O",2,"S02M", 0.,0.,+zfpos,  0,"ONLY");
 162 // //
 163 // // Inner frame
 164 //      tpar[0]= iChamber->RInner()-dframep1;
 165 //      tpar[1]= iChamber->RInner();
 166 //      tpar[2]= dframez/2;
 167 //      gMC->Gsvolu("S01I", "TUBE", idAlu1, tpar, 3);
 168 //      gMC->Gsvolu("S02I", "TUBE", idAlu1, tpar, 3);
 169
 170 //      gMC->Gspos("S01I",1,"S01M", 0.,0.,-zfpos,  0,"ONLY");
 171 //      gMC->Gspos("S01I",2,"S01M", 0.,0.,+zfpos,  0,"ONLY");
 172 //      gMC->Gspos("S02I",1,"S02M", 0.,0.,-zfpos,  0,"ONLY");
 173 //      gMC->Gspos("S02I",2,"S02M", 0.,0.,+zfpos,  0,"ONLY");
 174 //
 175 // Frame Crosses
 176      if (frameCrosses) {
 177          // outside gas
 178          // security for inside mother volume
 179          Float_t bpar[3];
 180          bpar[0] = (iChamber->ROuter() - iChamber->RInner())
 181            * TMath::Cos(TMath::ASin(dframep1 /
 182                                    (iChamber->ROuter() - iChamber->RInner())))
 183            / 2.0;
 184          bpar[1] = dframep1/2;
 185          // total thickness will be (4 * bpar[2]) for each chamber,
 186          // which has to be equal to (2 * dframez) - DAlu
 187          bpar[2] = (2.0 * dframez - iChamber->DAlu()) / 4.0;
 188          gMC->Gsvolu("S01B", "BOX", idAlu1, bpar, 3);
 189          gMC->Gsvolu("S02B", "BOX", idAlu1, bpar, 3);
 190
 191          gMC->Gspos("S01B",1,"S01M", +iChamber->RInner()+bpar[0] , 0,-zfpos,
 192                     irot1,"ONLY");
 193          gMC->Gspos("S01B",2,"S01M", -iChamber->RInner()-bpar[0] , 0,-zfpos,
 194                     irot1,"ONLY");
 195          gMC->Gspos("S01B",3,"S01M", 0, +iChamber->RInner()+bpar[0] ,-zfpos,
 196                     irot2,"ONLY");
 197          gMC->Gspos("S01B",4,"S01M", 0, -iChamber->RInner()-bpar[0] ,-zfpos,
 198                     irot2,"ONLY");
 199          gMC->Gspos("S01B",5,"S01M", +iChamber->RInner()+bpar[0] , 0,+zfpos,
 200                     irot1,"ONLY");
 201          gMC->Gspos("S01B",6,"S01M", -iChamber->RInner()-bpar[0] , 0,+zfpos,
 202                     irot1,"ONLY");
 203          gMC->Gspos("S01B",7,"S01M", 0, +iChamber->RInner()+bpar[0] ,+zfpos,
 204                     irot2,"ONLY");
 205          gMC->Gspos("S01B",8,"S01M", 0, -iChamber->RInner()-bpar[0] ,+zfpos,
 206                     irot2,"ONLY");
 207
 208          gMC->Gspos("S02B",1,"S02M", +iChamber->RInner()+bpar[0] , 0,-zfpos,
 209                     irot1,"ONLY");
 210          gMC->Gspos("S02B",2,"S02M", -iChamber->RInner()-bpar[0] , 0,-zfpos,
 211                     irot1,"ONLY");
 212          gMC->Gspos("S02B",3,"S02M", 0, +iChamber->RInner()+bpar[0] ,-zfpos,
 213                     irot2,"ONLY");
 214          gMC->Gspos("S02B",4,"S02M", 0, -iChamber->RInner()-bpar[0] ,-zfpos,
 215                     irot2,"ONLY");
 216          gMC->Gspos("S02B",5,"S02M", +iChamber->RInner()+bpar[0] , 0,+zfpos,
 217                     irot1,"ONLY");
 218          gMC->Gspos("S02B",6,"S02M", -iChamber->RInner()-bpar[0] , 0,+zfpos,
 219                     irot1,"ONLY");
 220          gMC->Gspos("S02B",7,"S02M", 0, +iChamber->RInner()+bpar[0] ,+zfpos,
 221                     irot2,"ONLY");
 222          gMC->Gspos("S02B",8,"S02M", 0, -iChamber->RInner()-bpar[0] ,+zfpos,
 223                     irot2,"ONLY");
 224      }
 225 //
 226 //   Chamber Material represented by Alu sheet
 227      tpar[0]= iChamber->RInner();
 228      tpar[1]= iChamber->ROuter();
 229      tpar[2] = (iChamber->DGas()+iChamber->DAlu())/2;
 230      gMC->Gsvolu("S01A", "TUBE",  idAlu2, tpar, 3);
 231      gMC->Gsvolu("S02A", "TUBE",idAlu2, tpar, 3);
 232      gMC->Gspos("S01A", 1, "S01M", 0., 0., 0.,  0, "ONLY");
 233      gMC->Gspos("S02A", 1, "S02M", 0., 0., 0.,  0, "ONLY");
 234 //
 235 //   Sensitive volumes
 236      // tpar[2] = iChamber->DGas();
 237      tpar[2] = iChamber->DGas()/2;
 238      gMC->Gsvolu("S01G", "TUBE", idGas, tpar, 3);
 239      gMC->Gsvolu("S02G", "TUBE", idGas, tpar, 3);
 240      gMC->Gspos("S01G", 1, "S01A", 0., 0., 0.,  0, "ONLY");
 241      gMC->Gspos("S02G", 1, "S02A", 0., 0., 0.,  0, "ONLY");
 242 //
 243 // Frame Crosses to be placed inside gas
 244      // NONE: chambers are sensitive everywhere
 245 //      if (frameCrosses) {
 246
 247 //       dr = (iChamber->ROuter() - iChamber->RInner());
 248 //       bpar[0] = TMath::Sqrt(dr*dr-dframep1*dframep1/4)/2;
 249 //       bpar[1] = dframep1/2;
 250 //       bpar[2] = iChamber->DGas()/2;
 251 //       gMC->Gsvolu("S01F", "BOX", idAlu1, bpar, 3);
 252 //       gMC->Gsvolu("S02F", "BOX", idAlu1, bpar, 3);
 253
 254 //       gMC->Gspos("S01F",1,"S01G", +iChamber->RInner()+bpar[0] , 0, 0,
 255 //                  irot1,"ONLY");
 256 //       gMC->Gspos("S01F",2,"S01G", -iChamber->RInner()-bpar[0] , 0, 0,
 257 //                  irot1,"ONLY");
 258 //       gMC->Gspos("S01F",3,"S01G", 0, +iChamber->RInner()+bpar[0] , 0,
 259 //                  irot2,"ONLY");
 260 //       gMC->Gspos("S01F",4,"S01G", 0, -iChamber->RInner()-bpar[0] , 0,
 261 //                  irot2,"ONLY");
 262
 263 //       gMC->Gspos("S02F",1,"S02G", +iChamber->RInner()+bpar[0] , 0, 0,
 264 //                  irot1,"ONLY");
 265 //       gMC->Gspos("S02F",2,"S02G", -iChamber->RInner()-bpar[0] , 0, 0,
 266 //                  irot1,"ONLY");
 267 //       gMC->Gspos("S02F",3,"S02G", 0, +iChamber->RInner()+bpar[0] , 0,
 268 //                  irot2,"ONLY");
 269 //       gMC->Gspos("S02F",4,"S02G", 0, -iChamber->RInner()-bpar[0] , 0,
 270 //                  irot2,"ONLY");
 271 //      }
 272 }
 273
 274 //______________________________________________________________________________
 275 void AliMUONSt1GeometryBuilder::SetTransformations()
 276 {
 277 // Defines the transformations for the station2 chambers.
 278 // ---
 279
 280   AliMUONChamber* iChamber1 = GetChamber(0);
 281   Double_t zpos1= - iChamber1->Z();
 282   iChamber1->GetGeometry()
 283     ->SetTranslation(TGeoTranslation(0., 0., zpos1));
 284
 285   AliMUONChamber* iChamber2 = GetChamber(1);
 286   Double_t zpos2 = - iChamber2->Z();
 287   iChamber2->GetGeometry()
 288     ->SetTranslation(TGeoTranslation(0., 0., zpos2));
 289 }
 290
 291 //______________________________________________________________________________
 292 void AliMUONSt1GeometryBuilder::SetSensitiveVolumes()
 293 {
 294 // Defines the sensitive volumes for station1 chambers.
 295 // ---
 296
 297   GetChamber(0)->GetGeometry()->SetSensitiveVolume("S01G");
 298   GetChamber(1)->GetGeometry()->SetSensitiveVolume("S02G");
 299 }