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