MUON/AliMUONSt1GeometryBuilder.cxx

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   3  *                                                                        *
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  15
  16 // $Id$
  17
  18 //-----------------------------------------------------------------------------
  19 // Class AliMUONSt1GeometryBuilder
  20 // -------------------------------
  21 // MUON Station1 coarse geometry construction class.
  22 // Extracted from AliMUONv1
  23 // by Ivana Hrivnacova, IPN Orsay
  24 // Included in AliRoot 2004/01/23
  25 //-----------------------------------------------------------------------------
  26
  27 #include <TVirtualMC.h>
  28 #include <TGeoMatrix.h>
  29
  30 #include "AliLog.h"
  31
  32 #include "AliMUONSt1GeometryBuilder.h"
  33 #include "AliMUON.h"
  34 #include "TArrayI.h"
  35 #include "AliMUONConstants.h"
  36 #include "AliMUONGeometryModule.h"
  37 #include "AliMUONGeometryEnvelopeStore.h"
  38
  39 /// \cond CLASSIMP
  40 ClassImp(AliMUONSt1GeometryBuilder)
  41 /// \endcond
  42
  43 //______________________________________________________________________________
  44 AliMUONSt1GeometryBuilder::AliMUONSt1GeometryBuilder(AliMUON* muon)
  45  : AliMUONVGeometryBuilder(0, 2),
  46    fMUON(muon)
  47 {
  48 /// Standard constructor
  49
  50 }
  51
  52 //______________________________________________________________________________
  53 AliMUONSt1GeometryBuilder::AliMUONSt1GeometryBuilder()
  54  : AliMUONVGeometryBuilder(),
  55    fMUON(0)
  56 {
  57 /// Default constructor
  58 }
  59
  60 //______________________________________________________________________________
  61 AliMUONSt1GeometryBuilder::~AliMUONSt1GeometryBuilder()
  62 {
  63 /// Destructor
  64 }
  65
  66 //
  67 // public methods
  68 //
  69
  70 //______________________________________________________________________________
  71 void AliMUONSt1GeometryBuilder::CreateGeometry()
  72 {
  73 /// From AliMUONv1::CreateGeometry()
  74
  75 //********************************************************************
  76 //                            Station 1                             **
  77 //********************************************************************
  78 //  CONCENTRIC
  79      // indices 1 and 2 for first and second chambers in the station
  80      // iChamber (first chamber) kept for other quanties than Z,
  81      // assumed to be the same in both chambers
  82
  83      // Get tracking medias Ids
  84      Int_t *idtmed = fMUON->GetIdtmed()->GetArray()-1099;
  85      Int_t idAir= idtmed[1100]; // medium 1
  86      Int_t idAlu1=idtmed[1103]; // medium 4
  87      Int_t idAlu2=idtmed[1104]; // medium 5
  88      Int_t idGas=idtmed[1108];  // medium 9 = Ar-CO2 gas (80%+20%)
  89      Bool_t frameCrosses=kTRUE;
  90
  91      // Rotation matrices in the x-y plane
  92      // phi=   0 deg
  93      Int_t irot1;
  94      fMUON->AliMatrix(irot1,  90.,   0., 90.,  90., 0., 0.);
  95      // phi=  90 deg
  96      Int_t irot2;
  97      fMUON->AliMatrix(irot2,  90.,  90., 90., 180., 0., 0.);
  98
  99      // DGas decreased from standard one (0.5)
 100      const Float_t kDGas = 0.4;
 101
 102      // DAlu increased from standard one (3% of X0),
 103      // because more electronics with smaller pads
 104      const Float_t kDAlu = 3.5 * 8.9 / 100.;
 105
 106      // Half of the total thickness of frame crosses (including DAlu)
 107      // for each chamber in stations 1 and 2:
 108      // 3% of X0 of composite material,
 109      // but taken as Aluminium here, with same thickness in number of X0
 110      Float_t dframez = 3. * 8.9 / 100;
 111      Float_t zfpos=-(kDGas+dframez+kDAlu)/2;
 112              // The same parameters are defined in builder for station 2
 113
 114      // Mother volume
 115      // Outer excess and inner recess for mother volume radius
 116      // with respect to ROuter and RInner
 117      Float_t dframep=.001; // Value for station 3 should be 6 ...
 118      // Width (RdPhi) of the frame crosses for stations 1 and 2 (cm)
 119      // Float_t dframep1=.001;
 120      Float_t dframep1 = 11.0;
 121      Float_t phi=2*TMath::Pi()/12/2;
 122              // The same parameters are defined in builder for station 2
 123
 124      Float_t tpar[3];
 125      Float_t dstation = (-AliMUONConstants::DefaultChamberZ(1)) -
 126                         (-AliMUONConstants::DefaultChamberZ(0));
 127      tpar[0] = AliMUONConstants::Rmin(0)-dframep;
 128      tpar[1] = (AliMUONConstants::Rmax(0)+dframep)/TMath::Cos(phi);
 129      tpar[2] = dstation/5;
 130
 131      gMC->Gsvolu("S01M", "TUBE", idAir, tpar, 3);
 132      gMC->Gsvolu("S02M", "TUBE", idAir, tpar, 3);
 133
 134      // CHANGED
 135      //gMC->Gspos("S01M", 1, "ALIC", 0., 0., zpos1 , 0, "ONLY");
 136      //gMC->Gspos("S02M", 1, "ALIC", 0., 0., zpos2 , 0, "ONLY");
 137
 138      GetEnvelopes(0)->AddEnvelope("S01M", 100, false);
 139      GetEnvelopes(1)->AddEnvelope("S02M", 200, false);
 140
 141
 142 // // Aluminium frames
 143 // // Outer frames
 144 //      pgpar[0] = 360/12/2;
 145 //      pgpar[1] = 360.;
 146 //      pgpar[2] = 12.;
 147 //      pgpar[3] =   2;
 148 //      pgpar[4] = -dframez/2;
 149 //      pgpar[5] = AliMUONConstants::Rmax(0);
 150 //      pgpar[6] = pgpar[5]+dframep1;
 151 //      pgpar[7] = +dframez/2;
 152 //      pgpar[8] = pgpar[5];
 153 //      pgpar[9] = pgpar[6];
 154 //      gMC->Gsvolu("S01O", "PGON", idAlu1, pgpar, 10);
 155 //      gMC->Gsvolu("S02O", "PGON", idAlu1, pgpar, 10);
 156 //      gMC->Gspos("S01O",1,"S01M", 0.,0.,-zfpos,  0,"ONLY");
 157 //      gMC->Gspos("S01O",2,"S01M", 0.,0.,+zfpos,  0,"ONLY");
 158 //      gMC->Gspos("S02O",1,"S02M", 0.,0.,-zfpos,  0,"ONLY");
 159 //      gMC->Gspos("S02O",2,"S02M", 0.,0.,+zfpos,  0,"ONLY");
 160 // //
 161 // // Inner frame
 162 //      tpar[0]= AliMUONConstants::Rmin(0)-dframep1;
 163 //      tpar[1]= AliMUONConstants::Rmin(0);
 164 //      tpar[2]= dframez/2;
 165 //      gMC->Gsvolu("S01I", "TUBE", idAlu1, tpar, 3);
 166 //      gMC->Gsvolu("S02I", "TUBE", idAlu1, tpar, 3);
 167
 168 //      gMC->Gspos("S01I",1,"S01M", 0.,0.,-zfpos,  0,"ONLY");
 169 //      gMC->Gspos("S01I",2,"S01M", 0.,0.,+zfpos,  0,"ONLY");
 170 //      gMC->Gspos("S02I",1,"S02M", 0.,0.,-zfpos,  0,"ONLY");
 171 //      gMC->Gspos("S02I",2,"S02M", 0.,0.,+zfpos,  0,"ONLY");
 172 //
 173 // Frame Crosses
 174      if (frameCrosses) {
 175          // outside gas
 176          // security for inside mother volume
 177          Float_t bpar[3];
 178          bpar[0] = (AliMUONConstants::Rmax(0) - AliMUONConstants::Rmin(0))
 179            * TMath::Cos(TMath::ASin(dframep1 /
 180                    (AliMUONConstants::Rmax(0) - AliMUONConstants::Rmin(0))))
 181            / 2.0;
 182          bpar[1] = dframep1/2;
 183          // total thickness will be (4 * bpar[2]) for each chamber,
 184          // which has to be equal to (2 * dframez) - DAlu
 185          bpar[2] = (2.0 * dframez - kDAlu) / 4.0;
 186          gMC->Gsvolu("S01B", "BOX", idAlu1, bpar, 3);
 187          gMC->Gsvolu("S02B", "BOX", idAlu1, bpar, 3);
 188
 189          gMC->Gspos("S01B",1,"S01M", +AliMUONConstants::Rmin(0)+bpar[0] , 0,-zfpos,
 190                     irot1,"ONLY");
 191          gMC->Gspos("S01B",2,"S01M", -AliMUONConstants::Rmin(0)-bpar[0] , 0,-zfpos,
 192                     irot1,"ONLY");
 193          gMC->Gspos("S01B",3,"S01M", 0, +AliMUONConstants::Rmin(0)+bpar[0] ,-zfpos,
 194                     irot2,"ONLY");
 195          gMC->Gspos("S01B",4,"S01M", 0, -AliMUONConstants::Rmin(0)-bpar[0] ,-zfpos,
 196                     irot2,"ONLY");
 197          gMC->Gspos("S01B",5,"S01M", +AliMUONConstants::Rmin(0)+bpar[0] , 0,+zfpos,
 198                     irot1,"ONLY");
 199          gMC->Gspos("S01B",6,"S01M", -AliMUONConstants::Rmin(0)-bpar[0] , 0,+zfpos,
 200                     irot1,"ONLY");
 201          gMC->Gspos("S01B",7,"S01M", 0, +AliMUONConstants::Rmin(0)+bpar[0] ,+zfpos,
 202                     irot2,"ONLY");
 203          gMC->Gspos("S01B",8,"S01M", 0, -AliMUONConstants::Rmin(0)-bpar[0] ,+zfpos,
 204                     irot2,"ONLY");
 205
 206          gMC->Gspos("S02B",1,"S02M", +AliMUONConstants::Rmin(0)+bpar[0] , 0,-zfpos,
 207                     irot1,"ONLY");
 208          gMC->Gspos("S02B",2,"S02M", -AliMUONConstants::Rmin(0)-bpar[0] , 0,-zfpos,
 209                     irot1,"ONLY");
 210          gMC->Gspos("S02B",3,"S02M", 0, +AliMUONConstants::Rmin(0)+bpar[0] ,-zfpos,
 211                     irot2,"ONLY");
 212          gMC->Gspos("S02B",4,"S02M", 0, -AliMUONConstants::Rmin(0)-bpar[0] ,-zfpos,
 213                     irot2,"ONLY");
 214          gMC->Gspos("S02B",5,"S02M", +AliMUONConstants::Rmin(0)+bpar[0] , 0,+zfpos,
 215                     irot1,"ONLY");
 216          gMC->Gspos("S02B",6,"S02M", -AliMUONConstants::Rmin(0)-bpar[0] , 0,+zfpos,
 217                     irot1,"ONLY");
 218          gMC->Gspos("S02B",7,"S02M", 0, +AliMUONConstants::Rmin(0)+bpar[0] ,+zfpos,
 219                     irot2,"ONLY");
 220          gMC->Gspos("S02B",8,"S02M", 0, -AliMUONConstants::Rmin(0)-bpar[0] ,+zfpos,
 221                     irot2,"ONLY");
 222      }
 223 //
 224 //   Chamber Material represented by Alu sheet
 225      tpar[0]= AliMUONConstants::Rmin(0);
 226      tpar[1]= AliMUONConstants::Rmax(0);
 227      tpar[2] = (kDGas+kDAlu)/2;
 228      gMC->Gsvolu("S01A", "TUBE",  idAlu2, tpar, 3);
 229      gMC->Gsvolu("S02A", "TUBE",idAlu2, tpar, 3);
 230      gMC->Gspos("S01A", 1, "S01M", 0., 0., 0.,  0, "ONLY");
 231      gMC->Gspos("S02A", 1, "S02M", 0., 0., 0.,  0, "ONLY");
 232 //
 233 //   Sensitive volumes
 234      // tpar[2] = kDGas;
 235      tpar[2] = kDGas/2;
 236      gMC->Gsvolu("S01G", "TUBE", idGas, tpar, 3);
 237      gMC->Gsvolu("S02G", "TUBE", idGas, tpar, 3);
 238      gMC->Gspos("S01G", 1, "S01A", 0., 0., 0.,  0, "ONLY");
 239      gMC->Gspos("S02G", 1, "S02A", 0., 0., 0.,  0, "ONLY");
 240 //
 241 // Frame Crosses to be placed inside gas
 242      // NONE: chambers are sensitive everywhere
 243 //      if (frameCrosses) {
 244
 245 //       dr = (AliMUONConstants::Rmax(0) - AliMUONConstants::Rmin(0));
 246 //       bpar[0] = TMath::Sqrt(dr*dr-dframep1*dframep1/4)/2;
 247 //       bpar[1] = dframep1/2;
 248 //       bpar[2] = kDGas/2;
 249 //       gMC->Gsvolu("S01F", "BOX", idAlu1, bpar, 3);
 250 //       gMC->Gsvolu("S02F", "BOX", idAlu1, bpar, 3);
 251
 252 //       gMC->Gspos("S01F",1,"S01G", +AliMUONConstants::Rmin(0)+bpar[0] , 0, 0,
 253 //                  irot1,"ONLY");
 254 //       gMC->Gspos("S01F",2,"S01G", -AliMUONConstants::Rmin(0)-bpar[0] , 0, 0,
 255 //                  irot1,"ONLY");
 256 //       gMC->Gspos("S01F",3,"S01G", 0, +AliMUONConstants::Rmin(0)+bpar[0] , 0,
 257 //                  irot2,"ONLY");
 258 //       gMC->Gspos("S01F",4,"S01G", 0, -AliMUONConstants::Rmin(0)-bpar[0] , 0,
 259 //                  irot2,"ONLY");
 260
 261 //       gMC->Gspos("S02F",1,"S02G", +AliMUONConstants::Rmin(0)+bpar[0] , 0, 0,
 262 //                  irot1,"ONLY");
 263 //       gMC->Gspos("S02F",2,"S02G", -AliMUONConstants::Rmin(0)-bpar[0] , 0, 0,
 264 //                  irot1,"ONLY");
 265 //       gMC->Gspos("S02F",3,"S02G", 0, +AliMUONConstants::Rmin(0)+bpar[0] , 0,
 266 //                  irot2,"ONLY");
 267 //       gMC->Gspos("S02F",4,"S02G", 0, -AliMUONConstants::Rmin(0)-bpar[0] , 0,
 268 //                  irot2,"ONLY");
 269 //      }
 270 }
 271
 272 //______________________________________________________________________________
 273 void AliMUONSt1GeometryBuilder::SetTransformations()
 274 {
 275 /// Define the transformations for the station2 chambers.
 276
 277   Double_t zpos1= - AliMUONConstants::DefaultChamberZ(0);
 278   SetTranslation(0, TGeoTranslation(0., 0., zpos1));
 279
 280   Double_t zpos2 = - AliMUONConstants::DefaultChamberZ(1);
 281   SetTranslation(0, TGeoTranslation(0., 0., zpos2));
 282 }
 283
 284 //______________________________________________________________________________
 285 void AliMUONSt1GeometryBuilder::SetSensitiveVolumes()
 286 {
 287 /// Define the sensitive volumes for station1 chambers.
 288
 289   GetGeometry(0)->SetSensitiveVolume("S01G");
 290   GetGeometry(1)->SetSensitiveVolume("S02G");
 291 }