MUON/AliMUONSt1GeometryBuilder.cxx

   1 // $Id$
   2 //
   3 // Class AliMUONSt1GeometryBuilder
   4 // -------------------------------
   5 // MUON Station1 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 "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 // Protected copy constructor
  43
  44   Fatal("Copy constructor",
  45         "Copy constructor is not implemented.");
  46 }
  47
  48 //______________________________________________________________________________
  49 AliMUONSt1GeometryBuilder::~AliMUONSt1GeometryBuilder() {
  50 //
  51 }
  52
  53 //______________________________________________________________________________
  54 AliMUONSt1GeometryBuilder&
  55 AliMUONSt1GeometryBuilder::operator = (const AliMUONSt1GeometryBuilder& rhs)
  56 {
  57 // Protected assignement operator
  58
  59   // check assignement to self
  60   if (this == &rhs) return *this;
  61
  62   Fatal("operator=",
  63         "Assignment operator is not implemented.");
  64
  65   return *this;
  66 }
  67
  68 //
  69 // public methods
  70 //
  71
  72 //______________________________________________________________________________
  73 void AliMUONSt1GeometryBuilder::CreateGeometry()
  74 {
  75 // From AliMUONv1::CreateGeometry()
  76 // ---
  77
  78 //********************************************************************
  79 //                            Station 1                             **
  80 //********************************************************************
  81 //  CONCENTRIC
  82      // indices 1 and 2 for first and second chambers in the station
  83      // iChamber (first chamber) kept for other quanties than Z,
  84      // assumed to be the same in both chambers
  85
  86      // Get tracking medias Ids
  87      Int_t *idtmed = fMUON->GetIdtmed()->GetArray()-1099;
  88      Int_t idAir= idtmed[1100]; // medium 1
  89      Int_t idAlu1=idtmed[1103]; // medium 4
  90      Int_t idAlu2=idtmed[1104]; // medium 5
  91      Int_t idGas=idtmed[1108];  // medium 9 = Ar-CO2 gas (80%+20%)
  92      Bool_t frameCrosses=kTRUE;
  93
  94      // Rotation matrices in the x-y plane
  95      // phi=   0 deg
  96      Int_t irot1;
  97      fMUON->AliMatrix(irot1,  90.,   0., 90.,  90., 0., 0.);
  98      // phi=  90 deg
  99      Int_t irot2;
 100      fMUON->AliMatrix(irot2,  90.,  90., 90., 180., 0., 0.);
 101
 102      AliMUONChamber* iChamber1 = GetChamber(0);
 103      AliMUONChamber* iChamber2 = GetChamber(1);
 104      AliMUONChamber* iChamber = iChamber1;
 105
 106      // DGas decreased from standard one (0.5)
 107      iChamber->SetDGas(0.4);
 108      iChamber2->SetDGas(0.4);
 109
 110      // DAlu increased from standard one (3% of X0),
 111      // because more electronics with smaller pads
 112      iChamber->SetDAlu(3.5 * 8.9 / 100.);
 113      iChamber2->SetDAlu(3.5 * 8.9 / 100.);
 114
 115      // Half of the total thickness of frame crosses (including DAlu)
 116      // for each chamber in stations 1 and 2:
 117      // 3% of X0 of composite material,
 118      // but taken as Aluminium here, with same thickness in number of X0
 119      Float_t dframez = 3. * 8.9 / 100;
 120      Float_t zfpos=-(iChamber->DGas()+dframez+iChamber->DAlu())/2;
 121              // The same parameters are defined in builder for station 2
 122
 123      // Mother volume
 124      // Outer excess and inner recess for mother volume radius
 125      // with respect to ROuter and RInner
 126      Float_t dframep=.001; // Value for station 3 should be 6 ...
 127      // Width (RdPhi) of the frame crosses for stations 1 and 2 (cm)
 128      // Float_t dframep1=.001;
 129      Float_t dframep1 = 11.0;
 130      Float_t phi=2*TMath::Pi()/12/2;
 131              // The same parameters are defined in builder for station 2
 132
 133      Float_t tpar[3];
 134      Float_t dstation = (-iChamber2->Z()) - (-iChamber1->Z());
 135      tpar[0] = iChamber->RInner()-dframep;
 136      tpar[1] = (iChamber->ROuter()+dframep)/TMath::Cos(phi);
 137      tpar[2] = dstation/5;
 138
 139      gMC->Gsvolu("S01M", "TUBE", idAir, tpar, 3);
 140      gMC->Gsvolu("S02M", "TUBE", idAir, tpar, 3);
 141
 142      // CHANGED
 143      //gMC->Gspos("S01M", 1, "ALIC", 0., 0., zpos1 , 0, "ONLY");
 144      //gMC->Gspos("S02M", 1, "ALIC", 0., 0., zpos2 , 0, "ONLY");
 145      GetChamber(0)->GetGeometry()->AddEnvelope("S01M", false);
 146      GetChamber(1)->GetGeometry()->AddEnvelope("S02M", false);
 147
 148 // // Aluminium frames
 149 // // Outer frames
 150 //      pgpar[0] = 360/12/2;
 151 //      pgpar[1] = 360.;
 152 //      pgpar[2] = 12.;
 153 //      pgpar[3] =   2;
 154 //      pgpar[4] = -dframez/2;
 155 //      pgpar[5] = iChamber->ROuter();
 156 //      pgpar[6] = pgpar[5]+dframep1;
 157 //      pgpar[7] = +dframez/2;
 158 //      pgpar[8] = pgpar[5];
 159 //      pgpar[9] = pgpar[6];
 160 //      gMC->Gsvolu("S01O", "PGON", idAlu1, pgpar, 10);
 161 //      gMC->Gsvolu("S02O", "PGON", idAlu1, pgpar, 10);
 162 //      gMC->Gspos("S01O",1,"S01M", 0.,0.,-zfpos,  0,"ONLY");
 163 //      gMC->Gspos("S01O",2,"S01M", 0.,0.,+zfpos,  0,"ONLY");
 164 //      gMC->Gspos("S02O",1,"S02M", 0.,0.,-zfpos,  0,"ONLY");
 165 //      gMC->Gspos("S02O",2,"S02M", 0.,0.,+zfpos,  0,"ONLY");
 166 // //
 167 // // Inner frame
 168 //      tpar[0]= iChamber->RInner()-dframep1;
 169 //      tpar[1]= iChamber->RInner();
 170 //      tpar[2]= dframez/2;
 171 //      gMC->Gsvolu("S01I", "TUBE", idAlu1, tpar, 3);
 172 //      gMC->Gsvolu("S02I", "TUBE", idAlu1, tpar, 3);
 173
 174 //      gMC->Gspos("S01I",1,"S01M", 0.,0.,-zfpos,  0,"ONLY");
 175 //      gMC->Gspos("S01I",2,"S01M", 0.,0.,+zfpos,  0,"ONLY");
 176 //      gMC->Gspos("S02I",1,"S02M", 0.,0.,-zfpos,  0,"ONLY");
 177 //      gMC->Gspos("S02I",2,"S02M", 0.,0.,+zfpos,  0,"ONLY");
 178 //
 179 // Frame Crosses
 180      if (frameCrosses) {
 181          // outside gas
 182          // security for inside mother volume
 183          Float_t bpar[3];
 184          bpar[0] = (iChamber->ROuter() - iChamber->RInner())
 185            * TMath::Cos(TMath::ASin(dframep1 /
 186                                    (iChamber->ROuter() - iChamber->RInner())))
 187            / 2.0;
 188          bpar[1] = dframep1/2;
 189          // total thickness will be (4 * bpar[2]) for each chamber,
 190          // which has to be equal to (2 * dframez) - DAlu
 191          bpar[2] = (2.0 * dframez - iChamber->DAlu()) / 4.0;
 192          gMC->Gsvolu("S01B", "BOX", idAlu1, bpar, 3);
 193          gMC->Gsvolu("S02B", "BOX", idAlu1, bpar, 3);
 194
 195          gMC->Gspos("S01B",1,"S01M", +iChamber->RInner()+bpar[0] , 0,-zfpos,
 196                     irot1,"ONLY");
 197          gMC->Gspos("S01B",2,"S01M", -iChamber->RInner()-bpar[0] , 0,-zfpos,
 198                     irot1,"ONLY");
 199          gMC->Gspos("S01B",3,"S01M", 0, +iChamber->RInner()+bpar[0] ,-zfpos,
 200                     irot2,"ONLY");
 201          gMC->Gspos("S01B",4,"S01M", 0, -iChamber->RInner()-bpar[0] ,-zfpos,
 202                     irot2,"ONLY");
 203          gMC->Gspos("S01B",5,"S01M", +iChamber->RInner()+bpar[0] , 0,+zfpos,
 204                     irot1,"ONLY");
 205          gMC->Gspos("S01B",6,"S01M", -iChamber->RInner()-bpar[0] , 0,+zfpos,
 206                     irot1,"ONLY");
 207          gMC->Gspos("S01B",7,"S01M", 0, +iChamber->RInner()+bpar[0] ,+zfpos,
 208                     irot2,"ONLY");
 209          gMC->Gspos("S01B",8,"S01M", 0, -iChamber->RInner()-bpar[0] ,+zfpos,
 210                     irot2,"ONLY");
 211
 212          gMC->Gspos("S02B",1,"S02M", +iChamber->RInner()+bpar[0] , 0,-zfpos,
 213                     irot1,"ONLY");
 214          gMC->Gspos("S02B",2,"S02M", -iChamber->RInner()-bpar[0] , 0,-zfpos,
 215                     irot1,"ONLY");
 216          gMC->Gspos("S02B",3,"S02M", 0, +iChamber->RInner()+bpar[0] ,-zfpos,
 217                     irot2,"ONLY");
 218          gMC->Gspos("S02B",4,"S02M", 0, -iChamber->RInner()-bpar[0] ,-zfpos,
 219                     irot2,"ONLY");
 220          gMC->Gspos("S02B",5,"S02M", +iChamber->RInner()+bpar[0] , 0,+zfpos,
 221                     irot1,"ONLY");
 222          gMC->Gspos("S02B",6,"S02M", -iChamber->RInner()-bpar[0] , 0,+zfpos,
 223                     irot1,"ONLY");
 224          gMC->Gspos("S02B",7,"S02M", 0, +iChamber->RInner()+bpar[0] ,+zfpos,
 225                     irot2,"ONLY");
 226          gMC->Gspos("S02B",8,"S02M", 0, -iChamber->RInner()-bpar[0] ,+zfpos,
 227                     irot2,"ONLY");
 228      }
 229 //
 230 //   Chamber Material represented by Alu sheet
 231      tpar[0]= iChamber->RInner();
 232      tpar[1]= iChamber->ROuter();
 233      tpar[2] = (iChamber->DGas()+iChamber->DAlu())/2;
 234      gMC->Gsvolu("S01A", "TUBE",  idAlu2, tpar, 3);
 235      gMC->Gsvolu("S02A", "TUBE",idAlu2, tpar, 3);
 236      gMC->Gspos("S01A", 1, "S01M", 0., 0., 0.,  0, "ONLY");
 237      gMC->Gspos("S02A", 1, "S02M", 0., 0., 0.,  0, "ONLY");
 238 //
 239 //   Sensitive volumes
 240      // tpar[2] = iChamber->DGas();
 241      tpar[2] = iChamber->DGas()/2;
 242      gMC->Gsvolu("S01G", "TUBE", idGas, tpar, 3);
 243      gMC->Gsvolu("S02G", "TUBE", idGas, tpar, 3);
 244      gMC->Gspos("S01G", 1, "S01A", 0., 0., 0.,  0, "ONLY");
 245      gMC->Gspos("S02G", 1, "S02A", 0., 0., 0.,  0, "ONLY");
 246 //
 247 // Frame Crosses to be placed inside gas
 248      // NONE: chambers are sensitive everywhere
 249 //      if (frameCrosses) {
 250
 251 //       dr = (iChamber->ROuter() - iChamber->RInner());
 252 //       bpar[0] = TMath::Sqrt(dr*dr-dframep1*dframep1/4)/2;
 253 //       bpar[1] = dframep1/2;
 254 //       bpar[2] = iChamber->DGas()/2;
 255 //       gMC->Gsvolu("S01F", "BOX", idAlu1, bpar, 3);
 256 //       gMC->Gsvolu("S02F", "BOX", idAlu1, bpar, 3);
 257
 258 //       gMC->Gspos("S01F",1,"S01G", +iChamber->RInner()+bpar[0] , 0, 0,
 259 //                  irot1,"ONLY");
 260 //       gMC->Gspos("S01F",2,"S01G", -iChamber->RInner()-bpar[0] , 0, 0,
 261 //                  irot1,"ONLY");
 262 //       gMC->Gspos("S01F",3,"S01G", 0, +iChamber->RInner()+bpar[0] , 0,
 263 //                  irot2,"ONLY");
 264 //       gMC->Gspos("S01F",4,"S01G", 0, -iChamber->RInner()-bpar[0] , 0,
 265 //                  irot2,"ONLY");
 266
 267 //       gMC->Gspos("S02F",1,"S02G", +iChamber->RInner()+bpar[0] , 0, 0,
 268 //                  irot1,"ONLY");
 269 //       gMC->Gspos("S02F",2,"S02G", -iChamber->RInner()-bpar[0] , 0, 0,
 270 //                  irot1,"ONLY");
 271 //       gMC->Gspos("S02F",3,"S02G", 0, +iChamber->RInner()+bpar[0] , 0,
 272 //                  irot2,"ONLY");
 273 //       gMC->Gspos("S02F",4,"S02G", 0, -iChamber->RInner()-bpar[0] , 0,
 274 //                  irot2,"ONLY");
 275 //      }
 276 }
 277
 278 //______________________________________________________________________________
 279 void AliMUONSt1GeometryBuilder::SetTransformations()
 280 {
 281 // Defines the transformations for the station2 chambers.
 282 // ---
 283
 284   AliMUONChamber* iChamber1 = GetChamber(0);
 285   Double_t zpos1= - iChamber1->Z();
 286   iChamber1->GetGeometry()
 287     ->SetTranslation(TGeoTranslation(0., 0., zpos1));
 288
 289   AliMUONChamber* iChamber2 = GetChamber(1);
 290   Double_t zpos2 = - iChamber2->Z();
 291   iChamber2->GetGeometry()
 292     ->SetTranslation(TGeoTranslation(0., 0., zpos2));
 293 }
 294
 295 //______________________________________________________________________________
 296 void AliMUONSt1GeometryBuilder::SetSensitiveVolumes()
 297 {
 298 // Defines the sensitive volumes for station1 chambers.
 299 // ---
 300
 301   GetChamber(0)->GetGeometry()->SetSensitiveVolume("S01G");
 302   GetChamber(1)->GetGeometry()->SetSensitiveVolume("S02G");
 303 }