MUON/AliMUONSt1GeometryBuilder.cxx

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   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 ClassImp(AliMUONSt1GeometryBuilder)
  37
  38 //______________________________________________________________________________
  39 AliMUONSt1GeometryBuilder::AliMUONSt1GeometryBuilder(AliMUON* muon)
  40  : AliMUONVGeometryBuilder(0, 1),
  41    fMUON(muon)
  42 {
  43 // Standard constructor
  44
  45 }
  46
  47 //______________________________________________________________________________
  48 AliMUONSt1GeometryBuilder::AliMUONSt1GeometryBuilder()
  49  : AliMUONVGeometryBuilder(),
  50    fMUON(0)
  51 {
  52 // Default constructor
  53 }
  54
  55
  56 //______________________________________________________________________________
  57 AliMUONSt1GeometryBuilder::AliMUONSt1GeometryBuilder(const AliMUONSt1GeometryBuilder& rhs)
  58   : AliMUONVGeometryBuilder(rhs)
  59 {
  60 // Protected copy constructor
  61
  62   AliFatal("Copy constructor is not implemented.");
  63 }
  64
  65 //______________________________________________________________________________
  66 AliMUONSt1GeometryBuilder::~AliMUONSt1GeometryBuilder() {
  67 //
  68 }
  69
  70 //______________________________________________________________________________
  71 AliMUONSt1GeometryBuilder&
  72 AliMUONSt1GeometryBuilder::operator = (const AliMUONSt1GeometryBuilder& rhs)
  73 {
  74 // Protected assignement operator
  75
  76   // check assignement to self
  77   if (this == &rhs) return *this;
  78
  79   AliFatal("Assignment operator is not implemented.");
  80
  81   return *this;
  82 }
  83
  84 //
  85 // public methods
  86 //
  87
  88 //______________________________________________________________________________
  89 void AliMUONSt1GeometryBuilder::CreateGeometry()
  90 {
  91 // From AliMUONv1::CreateGeometry()
  92 // ---
  93
  94 //********************************************************************
  95 //                            Station 1                             **
  96 //********************************************************************
  97 //  CONCENTRIC
  98      // indices 1 and 2 for first and second chambers in the station
  99      // iChamber (first chamber) kept for other quanties than Z,
 100      // assumed to be the same in both chambers
 101
 102      // Get tracking medias Ids
 103      Int_t *idtmed = fMUON->GetIdtmed()->GetArray()-1099;
 104      Int_t idAir= idtmed[1100]; // medium 1
 105      Int_t idAlu1=idtmed[1103]; // medium 4
 106      Int_t idAlu2=idtmed[1104]; // medium 5
 107      Int_t idGas=idtmed[1108];  // medium 9 = Ar-CO2 gas (80%+20%)
 108      Bool_t frameCrosses=kTRUE;
 109
 110      // Rotation matrices in the x-y plane
 111      // phi=   0 deg
 112      Int_t irot1;
 113      fMUON->AliMatrix(irot1,  90.,   0., 90.,  90., 0., 0.);
 114      // phi=  90 deg
 115      Int_t irot2;
 116      fMUON->AliMatrix(irot2,  90.,  90., 90., 180., 0., 0.);
 117
 118      // DGas decreased from standard one (0.5)
 119      const Float_t kDGas = 0.4;
 120
 121      // DAlu increased from standard one (3% of X0),
 122      // because more electronics with smaller pads
 123      const Float_t kDAlu = 3.5 * 8.9 / 100.;
 124
 125      // Half of the total thickness of frame crosses (including DAlu)
 126      // for each chamber in stations 1 and 2:
 127      // 3% of X0 of composite material,
 128      // but taken as Aluminium here, with same thickness in number of X0
 129      Float_t dframez = 3. * 8.9 / 100;
 130      Float_t zfpos=-(kDGas+dframez+kDAlu)/2;
 131              // The same parameters are defined in builder for station 2
 132
 133      // Mother volume
 134      // Outer excess and inner recess for mother volume radius
 135      // with respect to ROuter and RInner
 136      Float_t dframep=.001; // Value for station 3 should be 6 ...
 137      // Width (RdPhi) of the frame crosses for stations 1 and 2 (cm)
 138      // Float_t dframep1=.001;
 139      Float_t dframep1 = 11.0;
 140      Float_t phi=2*TMath::Pi()/12/2;
 141              // The same parameters are defined in builder for station 2
 142
 143      Float_t tpar[3];
 144      Float_t dstation = (-AliMUONConstants::DefaultChamberZ(1)) -
 145                         (-AliMUONConstants::DefaultChamberZ(0));
 146      tpar[0] = AliMUONConstants::Rmin(0)-dframep;
 147      tpar[1] = (AliMUONConstants::Rmax(0)+dframep)/TMath::Cos(phi);
 148      tpar[2] = dstation/5;
 149
 150      gMC->Gsvolu("S01M", "TUBE", idAir, tpar, 3);
 151      gMC->Gsvolu("S02M", "TUBE", idAir, tpar, 3);
 152
 153      // CHANGED
 154      //gMC->Gspos("S01M", 1, "ALIC", 0., 0., zpos1 , 0, "ONLY");
 155      //gMC->Gspos("S02M", 1, "ALIC", 0., 0., zpos2 , 0, "ONLY");
 156
 157      GetEnvelopes(0)->AddEnvelope("S01M", 100, false);
 158      GetEnvelopes(1)->AddEnvelope("S02M", 200, false);
 159
 160
 161 // // Aluminium frames
 162 // // Outer frames
 163 //      pgpar[0] = 360/12/2;
 164 //      pgpar[1] = 360.;
 165 //      pgpar[2] = 12.;
 166 //      pgpar[3] =   2;
 167 //      pgpar[4] = -dframez/2;
 168 //      pgpar[5] = AliMUONConstants::Rmax(0);
 169 //      pgpar[6] = pgpar[5]+dframep1;
 170 //      pgpar[7] = +dframez/2;
 171 //      pgpar[8] = pgpar[5];
 172 //      pgpar[9] = pgpar[6];
 173 //      gMC->Gsvolu("S01O", "PGON", idAlu1, pgpar, 10);
 174 //      gMC->Gsvolu("S02O", "PGON", idAlu1, pgpar, 10);
 175 //      gMC->Gspos("S01O",1,"S01M", 0.,0.,-zfpos,  0,"ONLY");
 176 //      gMC->Gspos("S01O",2,"S01M", 0.,0.,+zfpos,  0,"ONLY");
 177 //      gMC->Gspos("S02O",1,"S02M", 0.,0.,-zfpos,  0,"ONLY");
 178 //      gMC->Gspos("S02O",2,"S02M", 0.,0.,+zfpos,  0,"ONLY");
 179 // //
 180 // // Inner frame
 181 //      tpar[0]= AliMUONConstants::Rmin(0)-dframep1;
 182 //      tpar[1]= AliMUONConstants::Rmin(0);
 183 //      tpar[2]= dframez/2;
 184 //      gMC->Gsvolu("S01I", "TUBE", idAlu1, tpar, 3);
 185 //      gMC->Gsvolu("S02I", "TUBE", idAlu1, tpar, 3);
 186
 187 //      gMC->Gspos("S01I",1,"S01M", 0.,0.,-zfpos,  0,"ONLY");
 188 //      gMC->Gspos("S01I",2,"S01M", 0.,0.,+zfpos,  0,"ONLY");
 189 //      gMC->Gspos("S02I",1,"S02M", 0.,0.,-zfpos,  0,"ONLY");
 190 //      gMC->Gspos("S02I",2,"S02M", 0.,0.,+zfpos,  0,"ONLY");
 191 //
 192 // Frame Crosses
 193      if (frameCrosses) {
 194          // outside gas
 195          // security for inside mother volume
 196          Float_t bpar[3];
 197          bpar[0] = (AliMUONConstants::Rmax(0) - AliMUONConstants::Rmin(0))
 198            * TMath::Cos(TMath::ASin(dframep1 /
 199                    (AliMUONConstants::Rmax(0) - AliMUONConstants::Rmin(0))))
 200            / 2.0;
 201          bpar[1] = dframep1/2;
 202          // total thickness will be (4 * bpar[2]) for each chamber,
 203          // which has to be equal to (2 * dframez) - DAlu
 204          bpar[2] = (2.0 * dframez - kDAlu) / 4.0;
 205          gMC->Gsvolu("S01B", "BOX", idAlu1, bpar, 3);
 206          gMC->Gsvolu("S02B", "BOX", idAlu1, bpar, 3);
 207
 208          gMC->Gspos("S01B",1,"S01M", +AliMUONConstants::Rmin(0)+bpar[0] , 0,-zfpos,
 209                     irot1,"ONLY");
 210          gMC->Gspos("S01B",2,"S01M", -AliMUONConstants::Rmin(0)-bpar[0] , 0,-zfpos,
 211                     irot1,"ONLY");
 212          gMC->Gspos("S01B",3,"S01M", 0, +AliMUONConstants::Rmin(0)+bpar[0] ,-zfpos,
 213                     irot2,"ONLY");
 214          gMC->Gspos("S01B",4,"S01M", 0, -AliMUONConstants::Rmin(0)-bpar[0] ,-zfpos,
 215                     irot2,"ONLY");
 216          gMC->Gspos("S01B",5,"S01M", +AliMUONConstants::Rmin(0)+bpar[0] , 0,+zfpos,
 217                     irot1,"ONLY");
 218          gMC->Gspos("S01B",6,"S01M", -AliMUONConstants::Rmin(0)-bpar[0] , 0,+zfpos,
 219                     irot1,"ONLY");
 220          gMC->Gspos("S01B",7,"S01M", 0, +AliMUONConstants::Rmin(0)+bpar[0] ,+zfpos,
 221                     irot2,"ONLY");
 222          gMC->Gspos("S01B",8,"S01M", 0, -AliMUONConstants::Rmin(0)-bpar[0] ,+zfpos,
 223                     irot2,"ONLY");
 224
 225          gMC->Gspos("S02B",1,"S02M", +AliMUONConstants::Rmin(0)+bpar[0] , 0,-zfpos,
 226                     irot1,"ONLY");
 227          gMC->Gspos("S02B",2,"S02M", -AliMUONConstants::Rmin(0)-bpar[0] , 0,-zfpos,
 228                     irot1,"ONLY");
 229          gMC->Gspos("S02B",3,"S02M", 0, +AliMUONConstants::Rmin(0)+bpar[0] ,-zfpos,
 230                     irot2,"ONLY");
 231          gMC->Gspos("S02B",4,"S02M", 0, -AliMUONConstants::Rmin(0)-bpar[0] ,-zfpos,
 232                     irot2,"ONLY");
 233          gMC->Gspos("S02B",5,"S02M", +AliMUONConstants::Rmin(0)+bpar[0] , 0,+zfpos,
 234                     irot1,"ONLY");
 235          gMC->Gspos("S02B",6,"S02M", -AliMUONConstants::Rmin(0)-bpar[0] , 0,+zfpos,
 236                     irot1,"ONLY");
 237          gMC->Gspos("S02B",7,"S02M", 0, +AliMUONConstants::Rmin(0)+bpar[0] ,+zfpos,
 238                     irot2,"ONLY");
 239          gMC->Gspos("S02B",8,"S02M", 0, -AliMUONConstants::Rmin(0)-bpar[0] ,+zfpos,
 240                     irot2,"ONLY");
 241      }
 242 //
 243 //   Chamber Material represented by Alu sheet
 244      tpar[0]= AliMUONConstants::Rmin(0);
 245      tpar[1]= AliMUONConstants::Rmax(0);
 246      tpar[2] = (kDGas+kDAlu)/2;
 247      gMC->Gsvolu("S01A", "TUBE",  idAlu2, tpar, 3);
 248      gMC->Gsvolu("S02A", "TUBE",idAlu2, tpar, 3);
 249      gMC->Gspos("S01A", 1, "S01M", 0., 0., 0.,  0, "ONLY");
 250      gMC->Gspos("S02A", 1, "S02M", 0., 0., 0.,  0, "ONLY");
 251 //
 252 //   Sensitive volumes
 253      // tpar[2] = kDGas;
 254      tpar[2] = kDGas/2;
 255      gMC->Gsvolu("S01G", "TUBE", idGas, tpar, 3);
 256      gMC->Gsvolu("S02G", "TUBE", idGas, tpar, 3);
 257      gMC->Gspos("S01G", 1, "S01A", 0., 0., 0.,  0, "ONLY");
 258      gMC->Gspos("S02G", 1, "S02A", 0., 0., 0.,  0, "ONLY");
 259 //
 260 // Frame Crosses to be placed inside gas
 261      // NONE: chambers are sensitive everywhere
 262 //      if (frameCrosses) {
 263
 264 //       dr = (AliMUONConstants::Rmax(0) - AliMUONConstants::Rmin(0));
 265 //       bpar[0] = TMath::Sqrt(dr*dr-dframep1*dframep1/4)/2;
 266 //       bpar[1] = dframep1/2;
 267 //       bpar[2] = kDGas/2;
 268 //       gMC->Gsvolu("S01F", "BOX", idAlu1, bpar, 3);
 269 //       gMC->Gsvolu("S02F", "BOX", idAlu1, bpar, 3);
 270
 271 //       gMC->Gspos("S01F",1,"S01G", +AliMUONConstants::Rmin(0)+bpar[0] , 0, 0,
 272 //                  irot1,"ONLY");
 273 //       gMC->Gspos("S01F",2,"S01G", -AliMUONConstants::Rmin(0)-bpar[0] , 0, 0,
 274 //                  irot1,"ONLY");
 275 //       gMC->Gspos("S01F",3,"S01G", 0, +AliMUONConstants::Rmin(0)+bpar[0] , 0,
 276 //                  irot2,"ONLY");
 277 //       gMC->Gspos("S01F",4,"S01G", 0, -AliMUONConstants::Rmin(0)-bpar[0] , 0,
 278 //                  irot2,"ONLY");
 279
 280 //       gMC->Gspos("S02F",1,"S02G", +AliMUONConstants::Rmin(0)+bpar[0] , 0, 0,
 281 //                  irot1,"ONLY");
 282 //       gMC->Gspos("S02F",2,"S02G", -AliMUONConstants::Rmin(0)-bpar[0] , 0, 0,
 283 //                  irot1,"ONLY");
 284 //       gMC->Gspos("S02F",3,"S02G", 0, +AliMUONConstants::Rmin(0)+bpar[0] , 0,
 285 //                  irot2,"ONLY");
 286 //       gMC->Gspos("S02F",4,"S02G", 0, -AliMUONConstants::Rmin(0)-bpar[0] , 0,
 287 //                  irot2,"ONLY");
 288 //      }
 289 }
 290
 291 //______________________________________________________________________________
 292 void AliMUONSt1GeometryBuilder::SetTransformations()
 293 {
 294 // Defines the transformations for the station2 chambers.
 295 // ---
 296
 297   Double_t zpos1= - AliMUONConstants::DefaultChamberZ(0);
 298   SetTranslation(0, TGeoTranslation(0., 0., zpos1));
 299
 300   Double_t zpos2 = - AliMUONConstants::DefaultChamberZ(1);
 301   SetTranslation(0, TGeoTranslation(0., 0., zpos2));
 302 }
 303
 304 //______________________________________________________________________________
 305 void AliMUONSt1GeometryBuilder::SetSensitiveVolumes()
 306 {
 307 // Defines the sensitive volumes for station1 chambers.
 308 // ---
 309
 310   GetGeometry(0)->SetSensitiveVolume("S01G");
 311   GetGeometry(1)->SetSensitiveVolume("S02G");
 312 }