MUON/AliMUONSt1GeometryBuilder.cxx

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   3  *                                                                        *
   4  * Author: The ALICE Off-line Project.                                    *
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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 using std::endl;
  40 using std::cout;
  41 /// \cond CLASSIMP
  42 ClassImp(AliMUONSt1GeometryBuilder)
  43 /// \endcond
  44
  45 //______________________________________________________________________________
  46 AliMUONSt1GeometryBuilder::AliMUONSt1GeometryBuilder(AliMUON* muon)
  47  : AliMUONVGeometryBuilder(0, 2),
  48    fMUON(muon)
  49 {
  50 /// Standard constructor
  51
  52 }
  53
  54 //______________________________________________________________________________
  55 AliMUONSt1GeometryBuilder::AliMUONSt1GeometryBuilder()
  56  : AliMUONVGeometryBuilder(),
  57    fMUON(0)
  58 {
  59 /// Default constructor
  60 }
  61
  62 //______________________________________________________________________________
  63 AliMUONSt1GeometryBuilder::~AliMUONSt1GeometryBuilder()
  64 {
  65 /// Destructor
  66 }
  67
  68 //
  69 // public methods
  70 //
  71
  72 //______________________________________________________________________________
  73 void AliMUONSt1GeometryBuilder::CreateGeometry()
  74 {
  75 /// From AliMUONv1::CreateGeometry()
  76
  77 //********************************************************************
  78 //                            Station 1                             **
  79 //********************************************************************
  80 //  CONCENTRIC
  81      // indices 1 and 2 for first and second chambers in the station
  82      // iChamber (first chamber) kept for other quanties than Z,
  83      // assumed to be the same in both chambers
  84
  85      // Get tracking medias Ids
  86      Int_t *idtmed = fMUON->GetIdtmed()->GetArray()-1099;
  87      Int_t idAir= idtmed[1100]; // medium 1
  88      Int_t idAlu1=idtmed[1103]; // medium 4
  89      Int_t idAlu2=idtmed[1104]; // medium 5
  90      Int_t idGas=idtmed[1108];  // medium 9 = Ar-CO2 gas (80%+20%)
  91      Bool_t frameCrosses=kTRUE;
  92
  93      // Rotation matrices in the x-y plane
  94      // phi=   0 deg
  95      Int_t irot1;
  96      fMUON->AliMatrix(irot1,  90.,   0., 90.,  90., 0., 0.);
  97      // phi=  90 deg
  98      Int_t irot2;
  99      fMUON->AliMatrix(irot2,  90.,  90., 90., 180., 0., 0.);
 100
 101      // DGas decreased from standard one (0.5)
 102      const Float_t kDGas = 0.4;
 103
 104      // DAlu increased from standard one (3% of X0),
 105      // because more electronics with smaller pads
 106      const Float_t kDAlu = 3.5 * 8.9 / 100.;
 107
 108      // Half of the total thickness of frame crosses (including DAlu)
 109      // for each chamber in stations 1 and 2:
 110      // 3% of X0 of composite material,
 111      // but taken as Aluminium here, with same thickness in number of X0
 112      Float_t dframez = 3. * 8.9 / 100;
 113      Float_t zfpos=-(kDGas+dframez+kDAlu)/2;
 114              // The same parameters are defined in builder for station 2
 115
 116      // Mother volume
 117      // Outer excess and inner recess for mother volume radius
 118      // with respect to ROuter and RInner
 119      Float_t dframep=.001; // Value for station 3 should be 6 ...
 120      // Width (RdPhi) of the frame crosses for stations 1 and 2 (cm)
 121      // Float_t dframep1=.001;
 122      Float_t dframep1 = 11.0;
 123      Float_t phi=2*TMath::Pi()/12/2;
 124              // The same parameters are defined in builder for station 2
 125
 126      Float_t tpar[3];
 127      Float_t dstation = (-AliMUONConstants::DefaultChamberZ(1)) -
 128                         (-AliMUONConstants::DefaultChamberZ(0));
 129      tpar[0] = AliMUONConstants::Rmin(0)-dframep;
 130      tpar[1] = (AliMUONConstants::Rmax(0)+dframep)/TMath::Cos(phi);
 131      tpar[2] = dstation/5;
 132
 133      gMC->Gsvolu("S01M", "TUBE", idAir, tpar, 3);
 134      gMC->Gsvolu("S02M", "TUBE", idAir, tpar, 3);
 135
 136      // CHANGED
 137      //gMC->Gspos("S01M", 1, "ALIC", 0., 0., zpos1 , 0, "ONLY");
 138      //gMC->Gspos("S02M", 1, "ALIC", 0., 0., zpos2 , 0, "ONLY");
 139
 140      GetEnvelopes(0)->AddEnvelope("S01M", 100, false);
 141      GetEnvelopes(1)->AddEnvelope("S02M", 200, false);
 142
 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] = AliMUONConstants::Rmax(0);
 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]= AliMUONConstants::Rmin(0)-dframep1;
 165 //      tpar[1]= AliMUONConstants::Rmin(0);
 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] = (AliMUONConstants::Rmax(0) - AliMUONConstants::Rmin(0))
 181            * TMath::Cos(TMath::ASin(dframep1 /
 182                    (AliMUONConstants::Rmax(0) - AliMUONConstants::Rmin(0))))
 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 - kDAlu) / 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", +AliMUONConstants::Rmin(0)+bpar[0] , 0,-zfpos,
 192                     irot1,"ONLY");
 193          gMC->Gspos("S01B",2,"S01M", -AliMUONConstants::Rmin(0)-bpar[0] , 0,-zfpos,
 194                     irot1,"ONLY");
 195          gMC->Gspos("S01B",3,"S01M", 0, +AliMUONConstants::Rmin(0)+bpar[0] ,-zfpos,
 196                     irot2,"ONLY");
 197          gMC->Gspos("S01B",4,"S01M", 0, -AliMUONConstants::Rmin(0)-bpar[0] ,-zfpos,
 198                     irot2,"ONLY");
 199          gMC->Gspos("S01B",5,"S01M", +AliMUONConstants::Rmin(0)+bpar[0] , 0,+zfpos,
 200                     irot1,"ONLY");
 201          gMC->Gspos("S01B",6,"S01M", -AliMUONConstants::Rmin(0)-bpar[0] , 0,+zfpos,
 202                     irot1,"ONLY");
 203          gMC->Gspos("S01B",7,"S01M", 0, +AliMUONConstants::Rmin(0)+bpar[0] ,+zfpos,
 204                     irot2,"ONLY");
 205          gMC->Gspos("S01B",8,"S01M", 0, -AliMUONConstants::Rmin(0)-bpar[0] ,+zfpos,
 206                     irot2,"ONLY");
 207
 208          gMC->Gspos("S02B",1,"S02M", +AliMUONConstants::Rmin(0)+bpar[0] , 0,-zfpos,
 209                     irot1,"ONLY");
 210          gMC->Gspos("S02B",2,"S02M", -AliMUONConstants::Rmin(0)-bpar[0] , 0,-zfpos,
 211                     irot1,"ONLY");
 212          gMC->Gspos("S02B",3,"S02M", 0, +AliMUONConstants::Rmin(0)+bpar[0] ,-zfpos,
 213                     irot2,"ONLY");
 214          gMC->Gspos("S02B",4,"S02M", 0, -AliMUONConstants::Rmin(0)-bpar[0] ,-zfpos,
 215                     irot2,"ONLY");
 216          gMC->Gspos("S02B",5,"S02M", +AliMUONConstants::Rmin(0)+bpar[0] , 0,+zfpos,
 217                     irot1,"ONLY");
 218          gMC->Gspos("S02B",6,"S02M", -AliMUONConstants::Rmin(0)-bpar[0] , 0,+zfpos,
 219                     irot1,"ONLY");
 220          gMC->Gspos("S02B",7,"S02M", 0, +AliMUONConstants::Rmin(0)+bpar[0] ,+zfpos,
 221                     irot2,"ONLY");
 222          gMC->Gspos("S02B",8,"S02M", 0, -AliMUONConstants::Rmin(0)-bpar[0] ,+zfpos,
 223                     irot2,"ONLY");
 224      }
 225 //
 226 //   Chamber Material represented by Alu sheet
 227      tpar[0]= AliMUONConstants::Rmin(0);
 228      tpar[1]= AliMUONConstants::Rmax(0);
 229      tpar[2] = (kDGas+kDAlu)/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] = kDGas;
 237      tpar[2] = kDGas/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 = (AliMUONConstants::Rmax(0) - AliMUONConstants::Rmin(0));
 248 //       bpar[0] = TMath::Sqrt(dr*dr-dframep1*dframep1/4)/2;
 249 //       bpar[1] = dframep1/2;
 250 //       bpar[2] = kDGas/2;
 251 //       gMC->Gsvolu("S01F", "BOX", idAlu1, bpar, 3);
 252 //       gMC->Gsvolu("S02F", "BOX", idAlu1, bpar, 3);
 253
 254 //       gMC->Gspos("S01F",1,"S01G", +AliMUONConstants::Rmin(0)+bpar[0] , 0, 0,
 255 //                  irot1,"ONLY");
 256 //       gMC->Gspos("S01F",2,"S01G", -AliMUONConstants::Rmin(0)-bpar[0] , 0, 0,
 257 //                  irot1,"ONLY");
 258 //       gMC->Gspos("S01F",3,"S01G", 0, +AliMUONConstants::Rmin(0)+bpar[0] , 0,
 259 //                  irot2,"ONLY");
 260 //       gMC->Gspos("S01F",4,"S01G", 0, -AliMUONConstants::Rmin(0)-bpar[0] , 0,
 261 //                  irot2,"ONLY");
 262
 263 //       gMC->Gspos("S02F",1,"S02G", +AliMUONConstants::Rmin(0)+bpar[0] , 0, 0,
 264 //                  irot1,"ONLY");
 265 //       gMC->Gspos("S02F",2,"S02G", -AliMUONConstants::Rmin(0)-bpar[0] , 0, 0,
 266 //                  irot1,"ONLY");
 267 //       gMC->Gspos("S02F",3,"S02G", 0, +AliMUONConstants::Rmin(0)+bpar[0] , 0,
 268 //                  irot2,"ONLY");
 269 //       gMC->Gspos("S02F",4,"S02G", 0, -AliMUONConstants::Rmin(0)-bpar[0] , 0,
 270 //                  irot2,"ONLY");
 271 //      }
 272 }
 273
 274 //______________________________________________________________________________
 275 void AliMUONSt1GeometryBuilder::SetVolumes()
 276 {
 277 /// Define the volumes for the station2 chambers.
 278 }
 279
 280 //______________________________________________________________________________
 281 void AliMUONSt1GeometryBuilder::SetTransformations()
 282 {
 283 /// Define the transformations for the station2 chambers.
 284
 285   Double_t zpos1= - AliMUONConstants::DefaultChamberZ(0);
 286   SetTranslation(0, TGeoTranslation(0., 0., zpos1));
 287
 288   Double_t zpos2 = - AliMUONConstants::DefaultChamberZ(1);
 289   SetTranslation(0, TGeoTranslation(0., 0., zpos2));
 290 }
 291
 292 //______________________________________________________________________________
 293 void AliMUONSt1GeometryBuilder::SetSensitiveVolumes()
 294 {
 295 /// Define the sensitive volumes for station1 chambers.
 296
 297   GetGeometry(0)->SetSensitiveVolume("S01G");
 298   GetGeometry(1)->SetSensitiveVolume("S02G");
 299 }