MUON/AliMUONSt1GeometryBuilder.cxx

   1 /**************************************************************************
   2  * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
   3  *                                                                        *
   4  * Author: The ALICE Off-line Project.                                    *
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  15
  16 // $Id$
  17 //
  18 // Class AliMUONSt1GeometryBuilder
  19 // -------------------------------
  20 // MUON Station1 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 "AliMUONSt1GeometryBuilder.h"
  31 #include "AliMUON.h"
  32 #include "AliMUONConstants.h"
  33 #include "AliMUONGeometryModule.h"
  34 #include "AliMUONGeometryEnvelopeStore.h"
  35
  36 /// \cond CLASSIMP
  37 ClassImp(AliMUONSt1GeometryBuilder)
  38 /// \endcond
  39
  40 //______________________________________________________________________________
  41 AliMUONSt1GeometryBuilder::AliMUONSt1GeometryBuilder(AliMUON* muon)
  42  : AliMUONVGeometryBuilder(0, 2),
  43    fMUON(muon)
  44 {
  45 /// Standard constructor
  46
  47 }
  48
  49 //______________________________________________________________________________
  50 AliMUONSt1GeometryBuilder::AliMUONSt1GeometryBuilder()
  51  : AliMUONVGeometryBuilder(),
  52    fMUON(0)
  53 {
  54 /// Default constructor
  55 }
  56
  57 //______________________________________________________________________________
  58 AliMUONSt1GeometryBuilder::~AliMUONSt1GeometryBuilder()
  59 {
  60 /// Destructor
  61 }
  62
  63 //
  64 // public methods
  65 //
  66
  67 //______________________________________________________________________________
  68 void AliMUONSt1GeometryBuilder::CreateGeometry()
  69 {
  70 /// From AliMUONv1::CreateGeometry()
  71
  72 //********************************************************************
  73 //                            Station 1                             **
  74 //********************************************************************
  75 //  CONCENTRIC
  76      // indices 1 and 2 for first and second chambers in the station
  77      // iChamber (first chamber) kept for other quanties than Z,
  78      // assumed to be the same in both chambers
  79
  80      // Get tracking medias Ids
  81      Int_t *idtmed = fMUON->GetIdtmed()->GetArray()-1099;
  82      Int_t idAir= idtmed[1100]; // medium 1
  83      Int_t idAlu1=idtmed[1103]; // medium 4
  84      Int_t idAlu2=idtmed[1104]; // medium 5
  85      Int_t idGas=idtmed[1108];  // medium 9 = Ar-CO2 gas (80%+20%)
  86      Bool_t frameCrosses=kTRUE;
  87
  88      // Rotation matrices in the x-y plane
  89      // phi=   0 deg
  90      Int_t irot1;
  91      fMUON->AliMatrix(irot1,  90.,   0., 90.,  90., 0., 0.);
  92      // phi=  90 deg
  93      Int_t irot2;
  94      fMUON->AliMatrix(irot2,  90.,  90., 90., 180., 0., 0.);
  95
  96      // DGas decreased from standard one (0.5)
  97      const Float_t kDGas = 0.4;
  98
  99      // DAlu increased from standard one (3% of X0),
 100      // because more electronics with smaller pads
 101      const Float_t kDAlu = 3.5 * 8.9 / 100.;
 102
 103      // Half of the total thickness of frame crosses (including DAlu)
 104      // for each chamber in stations 1 and 2:
 105      // 3% of X0 of composite material,
 106      // but taken as Aluminium here, with same thickness in number of X0
 107      Float_t dframez = 3. * 8.9 / 100;
 108      Float_t zfpos=-(kDGas+dframez+kDAlu)/2;
 109              // The same parameters are defined in builder for station 2
 110
 111      // Mother volume
 112      // Outer excess and inner recess for mother volume radius
 113      // with respect to ROuter and RInner
 114      Float_t dframep=.001; // Value for station 3 should be 6 ...
 115      // Width (RdPhi) of the frame crosses for stations 1 and 2 (cm)
 116      // Float_t dframep1=.001;
 117      Float_t dframep1 = 11.0;
 118      Float_t phi=2*TMath::Pi()/12/2;
 119              // The same parameters are defined in builder for station 2
 120
 121      Float_t tpar[3];
 122      Float_t dstation = (-AliMUONConstants::DefaultChamberZ(1)) -
 123                         (-AliMUONConstants::DefaultChamberZ(0));
 124      tpar[0] = AliMUONConstants::Rmin(0)-dframep;
 125      tpar[1] = (AliMUONConstants::Rmax(0)+dframep)/TMath::Cos(phi);
 126      tpar[2] = dstation/5;
 127
 128      gMC->Gsvolu("S01M", "TUBE", idAir, tpar, 3);
 129      gMC->Gsvolu("S02M", "TUBE", idAir, tpar, 3);
 130
 131      // CHANGED
 132      //gMC->Gspos("S01M", 1, "ALIC", 0., 0., zpos1 , 0, "ONLY");
 133      //gMC->Gspos("S02M", 1, "ALIC", 0., 0., zpos2 , 0, "ONLY");
 134
 135      GetEnvelopes(0)->AddEnvelope("S01M", 100, false);
 136      GetEnvelopes(1)->AddEnvelope("S02M", 200, false);
 137
 138
 139 // // Aluminium frames
 140 // // Outer frames
 141 //      pgpar[0] = 360/12/2;
 142 //      pgpar[1] = 360.;
 143 //      pgpar[2] = 12.;
 144 //      pgpar[3] =   2;
 145 //      pgpar[4] = -dframez/2;
 146 //      pgpar[5] = AliMUONConstants::Rmax(0);
 147 //      pgpar[6] = pgpar[5]+dframep1;
 148 //      pgpar[7] = +dframez/2;
 149 //      pgpar[8] = pgpar[5];
 150 //      pgpar[9] = pgpar[6];
 151 //      gMC->Gsvolu("S01O", "PGON", idAlu1, pgpar, 10);
 152 //      gMC->Gsvolu("S02O", "PGON", idAlu1, pgpar, 10);
 153 //      gMC->Gspos("S01O",1,"S01M", 0.,0.,-zfpos,  0,"ONLY");
 154 //      gMC->Gspos("S01O",2,"S01M", 0.,0.,+zfpos,  0,"ONLY");
 155 //      gMC->Gspos("S02O",1,"S02M", 0.,0.,-zfpos,  0,"ONLY");
 156 //      gMC->Gspos("S02O",2,"S02M", 0.,0.,+zfpos,  0,"ONLY");
 157 // //
 158 // // Inner frame
 159 //      tpar[0]= AliMUONConstants::Rmin(0)-dframep1;
 160 //      tpar[1]= AliMUONConstants::Rmin(0);
 161 //      tpar[2]= dframez/2;
 162 //      gMC->Gsvolu("S01I", "TUBE", idAlu1, tpar, 3);
 163 //      gMC->Gsvolu("S02I", "TUBE", idAlu1, tpar, 3);
 164
 165 //      gMC->Gspos("S01I",1,"S01M", 0.,0.,-zfpos,  0,"ONLY");
 166 //      gMC->Gspos("S01I",2,"S01M", 0.,0.,+zfpos,  0,"ONLY");
 167 //      gMC->Gspos("S02I",1,"S02M", 0.,0.,-zfpos,  0,"ONLY");
 168 //      gMC->Gspos("S02I",2,"S02M", 0.,0.,+zfpos,  0,"ONLY");
 169 //
 170 // Frame Crosses
 171      if (frameCrosses) {
 172          // outside gas
 173          // security for inside mother volume
 174          Float_t bpar[3];
 175          bpar[0] = (AliMUONConstants::Rmax(0) - AliMUONConstants::Rmin(0))
 176            * TMath::Cos(TMath::ASin(dframep1 /
 177                    (AliMUONConstants::Rmax(0) - AliMUONConstants::Rmin(0))))
 178            / 2.0;
 179          bpar[1] = dframep1/2;
 180          // total thickness will be (4 * bpar[2]) for each chamber,
 181          // which has to be equal to (2 * dframez) - DAlu
 182          bpar[2] = (2.0 * dframez - kDAlu) / 4.0;
 183          gMC->Gsvolu("S01B", "BOX", idAlu1, bpar, 3);
 184          gMC->Gsvolu("S02B", "BOX", idAlu1, bpar, 3);
 185
 186          gMC->Gspos("S01B",1,"S01M", +AliMUONConstants::Rmin(0)+bpar[0] , 0,-zfpos,
 187                     irot1,"ONLY");
 188          gMC->Gspos("S01B",2,"S01M", -AliMUONConstants::Rmin(0)-bpar[0] , 0,-zfpos,
 189                     irot1,"ONLY");
 190          gMC->Gspos("S01B",3,"S01M", 0, +AliMUONConstants::Rmin(0)+bpar[0] ,-zfpos,
 191                     irot2,"ONLY");
 192          gMC->Gspos("S01B",4,"S01M", 0, -AliMUONConstants::Rmin(0)-bpar[0] ,-zfpos,
 193                     irot2,"ONLY");
 194          gMC->Gspos("S01B",5,"S01M", +AliMUONConstants::Rmin(0)+bpar[0] , 0,+zfpos,
 195                     irot1,"ONLY");
 196          gMC->Gspos("S01B",6,"S01M", -AliMUONConstants::Rmin(0)-bpar[0] , 0,+zfpos,
 197                     irot1,"ONLY");
 198          gMC->Gspos("S01B",7,"S01M", 0, +AliMUONConstants::Rmin(0)+bpar[0] ,+zfpos,
 199                     irot2,"ONLY");
 200          gMC->Gspos("S01B",8,"S01M", 0, -AliMUONConstants::Rmin(0)-bpar[0] ,+zfpos,
 201                     irot2,"ONLY");
 202
 203          gMC->Gspos("S02B",1,"S02M", +AliMUONConstants::Rmin(0)+bpar[0] , 0,-zfpos,
 204                     irot1,"ONLY");
 205          gMC->Gspos("S02B",2,"S02M", -AliMUONConstants::Rmin(0)-bpar[0] , 0,-zfpos,
 206                     irot1,"ONLY");
 207          gMC->Gspos("S02B",3,"S02M", 0, +AliMUONConstants::Rmin(0)+bpar[0] ,-zfpos,
 208                     irot2,"ONLY");
 209          gMC->Gspos("S02B",4,"S02M", 0, -AliMUONConstants::Rmin(0)-bpar[0] ,-zfpos,
 210                     irot2,"ONLY");
 211          gMC->Gspos("S02B",5,"S02M", +AliMUONConstants::Rmin(0)+bpar[0] , 0,+zfpos,
 212                     irot1,"ONLY");
 213          gMC->Gspos("S02B",6,"S02M", -AliMUONConstants::Rmin(0)-bpar[0] , 0,+zfpos,
 214                     irot1,"ONLY");
 215          gMC->Gspos("S02B",7,"S02M", 0, +AliMUONConstants::Rmin(0)+bpar[0] ,+zfpos,
 216                     irot2,"ONLY");
 217          gMC->Gspos("S02B",8,"S02M", 0, -AliMUONConstants::Rmin(0)-bpar[0] ,+zfpos,
 218                     irot2,"ONLY");
 219      }
 220 //
 221 //   Chamber Material represented by Alu sheet
 222      tpar[0]= AliMUONConstants::Rmin(0);
 223      tpar[1]= AliMUONConstants::Rmax(0);
 224      tpar[2] = (kDGas+kDAlu)/2;
 225      gMC->Gsvolu("S01A", "TUBE",  idAlu2, tpar, 3);
 226      gMC->Gsvolu("S02A", "TUBE",idAlu2, tpar, 3);
 227      gMC->Gspos("S01A", 1, "S01M", 0., 0., 0.,  0, "ONLY");
 228      gMC->Gspos("S02A", 1, "S02M", 0., 0., 0.,  0, "ONLY");
 229 //
 230 //   Sensitive volumes
 231      // tpar[2] = kDGas;
 232      tpar[2] = kDGas/2;
 233      gMC->Gsvolu("S01G", "TUBE", idGas, tpar, 3);
 234      gMC->Gsvolu("S02G", "TUBE", idGas, tpar, 3);
 235      gMC->Gspos("S01G", 1, "S01A", 0., 0., 0.,  0, "ONLY");
 236      gMC->Gspos("S02G", 1, "S02A", 0., 0., 0.,  0, "ONLY");
 237 //
 238 // Frame Crosses to be placed inside gas
 239      // NONE: chambers are sensitive everywhere
 240 //      if (frameCrosses) {
 241
 242 //       dr = (AliMUONConstants::Rmax(0) - AliMUONConstants::Rmin(0));
 243 //       bpar[0] = TMath::Sqrt(dr*dr-dframep1*dframep1/4)/2;
 244 //       bpar[1] = dframep1/2;
 245 //       bpar[2] = kDGas/2;
 246 //       gMC->Gsvolu("S01F", "BOX", idAlu1, bpar, 3);
 247 //       gMC->Gsvolu("S02F", "BOX", idAlu1, bpar, 3);
 248
 249 //       gMC->Gspos("S01F",1,"S01G", +AliMUONConstants::Rmin(0)+bpar[0] , 0, 0,
 250 //                  irot1,"ONLY");
 251 //       gMC->Gspos("S01F",2,"S01G", -AliMUONConstants::Rmin(0)-bpar[0] , 0, 0,
 252 //                  irot1,"ONLY");
 253 //       gMC->Gspos("S01F",3,"S01G", 0, +AliMUONConstants::Rmin(0)+bpar[0] , 0,
 254 //                  irot2,"ONLY");
 255 //       gMC->Gspos("S01F",4,"S01G", 0, -AliMUONConstants::Rmin(0)-bpar[0] , 0,
 256 //                  irot2,"ONLY");
 257
 258 //       gMC->Gspos("S02F",1,"S02G", +AliMUONConstants::Rmin(0)+bpar[0] , 0, 0,
 259 //                  irot1,"ONLY");
 260 //       gMC->Gspos("S02F",2,"S02G", -AliMUONConstants::Rmin(0)-bpar[0] , 0, 0,
 261 //                  irot1,"ONLY");
 262 //       gMC->Gspos("S02F",3,"S02G", 0, +AliMUONConstants::Rmin(0)+bpar[0] , 0,
 263 //                  irot2,"ONLY");
 264 //       gMC->Gspos("S02F",4,"S02G", 0, -AliMUONConstants::Rmin(0)-bpar[0] , 0,
 265 //                  irot2,"ONLY");
 266 //      }
 267 }
 268
 269 //______________________________________________________________________________
 270 void AliMUONSt1GeometryBuilder::SetTransformations()
 271 {
 272 /// Define the transformations for the station2 chambers.
 273
 274   Double_t zpos1= - AliMUONConstants::DefaultChamberZ(0);
 275   SetTranslation(0, TGeoTranslation(0., 0., zpos1));
 276
 277   Double_t zpos2 = - AliMUONConstants::DefaultChamberZ(1);
 278   SetTranslation(0, TGeoTranslation(0., 0., zpos2));
 279 }
 280
 281 //______________________________________________________________________________
 282 void AliMUONSt1GeometryBuilder::SetSensitiveVolumes()
 283 {
 284 /// Define the sensitive volumes for station1 chambers.
 285
 286   GetGeometry(0)->SetSensitiveVolume("S01G");
 287   GetGeometry(1)->SetSensitiveVolume("S02G");
 288 }