MUON/AliMUONTriggerGeometryBuilder.cxx

   1 /**************************************************************************
   2  * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
   3  *                                                                        *
   4  * Author: The ALICE Off-line Project.                                    *
   5  * Contributors are mentioned in the code where appropriate.              *
   6  *                                                                        *
   7  * Permission to use, copy, modify and distribute this software and its   *
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  10  * copies and that both the copyright notice and this permission notice   *
  11  * appear in the supporting documentation. The authors make no claims     *
  12  * about the suitability of this software for any purpose. It is          *
  13  * provided "as is" without express or implied warranty.                  *
  14  **************************************************************************/
  15
  16 // $Id$
  17 //
  18 // Class AliMUONTriggerGeometryBuilder
  19 // -----------------------------------
  20 // MUON Trigger stations geometry construction class.
  21 //
  22 // Author: Philippe Crochette, LPC Clermont-Ferrand
  23
  24 #include <TVirtualMC.h>
  25 #include <TGeoMatrix.h>
  26
  27 #include "AliMUONTriggerGeometryBuilder.h"
  28 #include "AliMUON.h"
  29 #include "AliMUONChamber.h"
  30 #include "AliMUONChamberGeometry.h"
  31
  32 ClassImp(AliMUONTriggerGeometryBuilder)
  33
  34 //______________________________________________________________________________
  35 AliMUONTriggerGeometryBuilder::AliMUONTriggerGeometryBuilder(AliMUON* muon)
  36  : AliMUONVGeometryBuilder(&muon->Chamber(10), &muon->Chamber(11),&muon->Chamber(12),&muon->Chamber(13)),
  37    fMUON(muon)
  38 {
  39 // Standard constructor
  40
  41 }
  42
  43 //______________________________________________________________________________
  44 AliMUONTriggerGeometryBuilder::AliMUONTriggerGeometryBuilder()
  45  : AliMUONVGeometryBuilder(),
  46    fMUON(0)
  47 {
  48 // Default constructor
  49 }
  50
  51
  52 //______________________________________________________________________________
  53 AliMUONTriggerGeometryBuilder::AliMUONTriggerGeometryBuilder(const AliMUONTriggerGeometryBuilder& rhs)
  54   : AliMUONVGeometryBuilder(rhs)
  55 {
  56 // Protected copy constructor
  57
  58   Fatal("Copy constructor",
  59         "Copy constructor is not implemented.");
  60 }
  61
  62 //______________________________________________________________________________
  63 AliMUONTriggerGeometryBuilder::~AliMUONTriggerGeometryBuilder() {
  64 //
  65 }
  66
  67 //______________________________________________________________________________
  68 AliMUONTriggerGeometryBuilder&
  69 AliMUONTriggerGeometryBuilder::operator = (const AliMUONTriggerGeometryBuilder& rhs)
  70 {
  71 // Protected assignement operator
  72
  73   // check assignement to self
  74   if (this == &rhs) return *this;
  75
  76   Fatal("operator=",
  77         "Assignment operator is not implemented.");
  78
  79   return *this;
  80 }
  81
  82 //
  83 // public methods
  84 //
  85
  86 //______________________________________________________________________________
  87 void AliMUONTriggerGeometryBuilder::CreateGeometry()
  88 {
  89 // From AliMUONv1::CreateGeometry()
  90
  91     /*
  92        zpos1 and zpos2 are the middle of the first and second
  93        planes of station 1 (+1m for second station):
  94        zpos1=(zpos1m+zpos1p)/2=(15999+16071)/2=16035 mm, thick/2=40 mm
  95        zpos2=(zpos2m+zpos2p)/2=(16169+16241)/2=16205 mm, thick/2=40 mm
  96        zposxm and zposxp= middles of gaz gaps within a detection plane
  97        rem: the total thickness accounts for 1 mm of al on both
  98        side of the RPCs (see zpos1 and zpos2)
  99     */
 100
 101     Int_t *idtmed = fMUON->GetIdtmed()->GetArray()-1099;
 102     Int_t idAir= idtmed[1100]; // medium 1
 103     Int_t idAlu1=idtmed[1103]; // medium 4
 104     Float_t tpar[3];
 105     Double_t dpar[3];
 106
 107 // vertical gap between right and left chambers (kDXZERO*2=4cm)
 108     const Float_t kDXZERO=2.;
 109 // main distances for chamber definition in first plane/first station
 110     const Float_t kXMIN=34.;
 111     const Float_t kXMED=51.;
 112     const Float_t kXMAX=272.;
 113 // kXMAX will become 255. in real life. segmentation to be updated accordingly
 114 // (see fig.2-4 & 2-5 of Local Trigger Board PRR)
 115     const Float_t kYMIN=34.;
 116     const Float_t kYMAX=51.;
 117 // inner/outer radius of flange between beam shield. and chambers (1/station)
 118     const Float_t kRMIN[2]={50.,50.};
 119     const Float_t kRMAX[2]={64.,68.};
 120 // z position of the middle of the gas gap in mother vol
 121     const Float_t kZm=-3.6;
 122     const Float_t kZp=+3.6;
 123
 124     AliMUONChamber *iChamber, *iChamber1;
 125     iChamber1 = GetChamber(10);
 126     Float_t zpos1=-iChamber1->Z();
 127
 128 // ratio of zpos1m/zpos1p and inverse for first plane
 129     Float_t zmp=(zpos1-3.6)/(zpos1+3.6);
 130     Float_t zpm=1./zmp;
 131
 132     Int_t icount=0;  // chamber counter (0 1 2 3)
 133
 134     for (Int_t istation=0; istation<2; istation++) { // loop on stations
 135         for (Int_t iplane=0; iplane<2; iplane++) { // loop on detection planes
 136
 137             Int_t iVolNum=1; // counter Volume Number
 138             icount = Int_t(iplane*TMath::Power(2,0))+
 139                 Int_t(istation*TMath::Power(2,1));
 140
 141             iChamber = GetChamber(10+icount);
 142             Float_t zpos = - iChamber->Z();
 143
 144 // Flange between beam shielding and RPC
 145             tpar[0]= kRMIN[istation];
 146             tpar[1]= kRMAX[istation];
 147             tpar[2]= 4.0;
 148             char volFlange[5];
 149             sprintf(volFlange,"SF%dA",icount+1);
 150             gMC->Gsvolu(volFlange,"TUBE",idAlu1,tpar,3);     // Al
 151             // changed by ivana
 152             //gMC->Gspos(volFlange,1,"ALIC",0.,0.,zpos,0,"MANY");
 153             iChamber->GetGeometry()->AddEnvelope(volFlange, false, "MANY");
 154
 155 // scaling factor
 156             Float_t zRatio = zpos / zpos1;
 157
 158 // envelopes (same size except line 5, all virtual)
 159             char volEnv[18][5];
 160             tpar[1] = kYMIN * zRatio;
 161             tpar[2] = 0.4;
 162             Int_t i=0;    // counter
 163             for (Int_t icolumn=0; icolumn<2; icolumn++) {
 164                 for (Int_t iline=1; iline<10; iline++){
 165                     tpar[0] = (kXMAX/2.) * zRatio;
 166                     if (iline==5) tpar[0] = ((kXMAX-kXMED)/2.)*zRatio;
 167                     if (icolumn==0)
 168                         sprintf(volEnv[i],"S%dL%d",icount,iline);
 169                     else
 170                         sprintf(volEnv[i],"S%dR%d",icount,iline);
 171                     gMC->Gsvolu(volEnv[i],"BOX",idAir,tpar,0);
 172                     i++;
 173                 }
 174             }
 175
 176 // chamber prototype
 177             tpar[0]= 0.;
 178             tpar[1]= 0.;
 179             tpar[2]= 0.;
 180             char volAlu[5];     // Alu
 181             char volBak[5];     // Bakelite
 182             char volGaz[5];     // Gas streamer
 183             sprintf(volAlu,"SC%dA",icount+1);
 184             sprintf(volBak,"SB%dA",icount+1);
 185             sprintf(volGaz,"SG%dA",icount+1);
 186             gMC->Gsvolu(volAlu,"BOX",idAlu1,tpar,0);         // Al
 187             gMC->Gsvolu(volBak,"BOX",idtmed[1107],tpar,0);   // Bakelite
 188             gMC->Gsvolu(volGaz,"BOX",idtmed[1106],tpar,0);   // Gas streamer
 189             tpar[0] = -1.;
 190             tpar[1] = -1.;
 191             tpar[2] = 0.1;
 192             gMC->Gsposp(volGaz,1,volBak,0.,0.,0.,0,"ONLY",tpar,3);
 193             tpar[2] = 0.3;
 194             gMC->Gsposp(volBak,1,volAlu,0.,0.,0.,0,"ONLY",tpar,3);
 195
 196 // chamber type A
 197             Float_t xEnv = (kDXZERO+kXMED+(kXMAX-kXMED)/2.)*zRatio;
 198             Float_t yEnvM = 0.;  // y low position of envelope in chamber
 199             Float_t yEnvP = 0.;  // y up position of envelope in chamber
 200             Float_t yEnvPsave = 0.; // tmp data
 201             Float_t yEnvMsave = 0.; // tmp data
 202             Float_t xpos = 0.; // x position of RPC in envelope
 203             Float_t ypos = 0.; // y position of RPC in envelope
 204             dpar[2] = 0.4;
 205             dpar[0] = ((kXMAX-kXMED)/2.)*zRatio;
 206             dpar[1] = kYMIN * zRatio;
 207
 208             GetChamber(10+icount)->GetGeometry()->AddEnvelope(volEnv[4], true, TGeoTranslation(xEnv,yEnvM,kZm));
 209             GetChamber(10+icount)->GetGeometry()->AddEnvelope(volEnv[13], true, TGeoTranslation(-xEnv,yEnvP,kZp));
 210
 211             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[4],iVolNum++,3, dpar);
 212             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[13],iVolNum++,3, dpar);
 213
 214 // chamber type B (plus envelope chambers B & C)
 215             xEnv = (kDXZERO+kXMAX/2.)*zRatio;
 216             yEnvPsave = yEnvP;
 217             yEnvMsave = yEnvM;
 218             yEnvP = (yEnvMsave + kYMIN * zRatio ) * zpm + kYMIN * zRatio;
 219             yEnvM = (yEnvPsave + kYMIN * zRatio ) * zmp + kYMIN * zRatio;
 220             dpar[0] = ((kXMAX-kXMIN)/2.) * zRatio;
 221             dpar[1] = ((kYMAX-kYMIN)/2.) * zRatio;
 222             xpos = kXMIN/2. * zRatio;
 223             ypos = (kYMIN - kYMIN/4.) * zRatio;
 224
 225             GetChamber(10+icount)->GetGeometry()->AddEnvelope(volEnv[3], true, TGeoTranslation( xEnv,-yEnvP,kZp));
 226             GetChamber(10+icount)->GetGeometry()->AddEnvelope(volEnv[5], true, TGeoTranslation( xEnv, yEnvP,kZp));
 227             GetChamber(10+icount)->GetGeometry()->AddEnvelope(volEnv[12], true, TGeoTranslation(-xEnv,-yEnvM,kZm));
 228             GetChamber(10+icount)->GetGeometry()->AddEnvelope(volEnv[14], true, TGeoTranslation(-xEnv, yEnvM,kZm));
 229
 230             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[3],iVolNum++,TGeoTranslation(xpos, ypos,0.),3,dpar);
 231             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[5],iVolNum++,TGeoTranslation(xpos,-ypos,0.),3,dpar);
 232             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[12],iVolNum++,TGeoTranslation(-xpos, ypos,0.),3,dpar);
 233             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[14],iVolNum++,TGeoTranslation(-xpos,-ypos,0.),3,dpar);
 234
 235 // chamber type C (note: same Z than type B)
 236             dpar[0] = (kXMAX/2)*zRatio;
 237             dpar[1] = (kYMAX/2)*zRatio;
 238             xpos = 0.;
 239             ypos = ((kYMAX - kYMIN)/2.) * zRatio;
 240
 241             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[3],iVolNum++,TGeoTranslation(xpos,-ypos,0.),3,dpar);
 242             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[5],iVolNum++,TGeoTranslation(xpos, ypos,0.),3,dpar);
 243             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[12],iVolNum++,TGeoTranslation(-xpos,-ypos,0.),3,dpar);
 244             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[14],iVolNum++,TGeoTranslation(-xpos, ypos,0.),3,dpar);
 245
 246 // chamber type D, E and F (same size)
 247 // D
 248             yEnvPsave = yEnvP;
 249             yEnvMsave = yEnvM;
 250             yEnvP = (yEnvMsave + kYMIN * zRatio ) * zpm + kYMIN * zRatio;
 251             yEnvM = (yEnvPsave + kYMIN * zRatio ) * zmp + kYMIN * zRatio;
 252             dpar[0] = (kXMAX/2.)*zRatio;
 253             dpar[1] =  kYMIN*zRatio;
 254
 255             GetChamber(10+icount)->GetGeometry()->AddEnvelope(volEnv[2], true, TGeoTranslation(xEnv, yEnvM,kZm));
 256             GetChamber(10+icount)->GetGeometry()->AddEnvelope(volEnv[6], true, TGeoTranslation(-xEnv, yEnvP,kZp));
 257             GetChamber(10+icount)->GetGeometry()->AddEnvelope(volEnv[11], true, TGeoTranslation(xEnv,-yEnvM,kZm));
 258             GetChamber(10+icount)->GetGeometry()->AddEnvelope(volEnv[15], true, TGeoTranslation(-xEnv,-yEnvP,kZp));
 259
 260             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[2],iVolNum++,3, dpar);
 261             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[6],iVolNum++,3, dpar);
 262             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[11],iVolNum++,3, dpar);
 263             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[15],iVolNum++,3, dpar);
 264
 265 // E
 266             yEnvPsave = yEnvP;
 267             yEnvMsave = yEnvM;
 268             yEnvP = (yEnvMsave + kYMIN * zRatio ) * zpm + kYMIN * zRatio;
 269             yEnvM = (yEnvPsave + kYMIN * zRatio ) * zmp + kYMIN * zRatio;
 270
 271             GetChamber(10+icount)->GetGeometry()->AddEnvelope(volEnv[1], true, TGeoTranslation(xEnv, yEnvP,kZp));
 272             GetChamber(10+icount)->GetGeometry()->AddEnvelope(volEnv[7], true, TGeoTranslation(-xEnv, yEnvM,kZm));
 273             GetChamber(10+icount)->GetGeometry()->AddEnvelope(volEnv[10], true, TGeoTranslation(xEnv,-yEnvP,kZp));
 274             GetChamber(10+icount)->GetGeometry()->AddEnvelope(volEnv[16], true, TGeoTranslation(-xEnv,-yEnvM,kZm));
 275
 276             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[1],iVolNum++,3,dpar);
 277             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[7],iVolNum++,3,dpar);
 278             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[10],iVolNum++,3,dpar);
 279             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[16],iVolNum++,3,dpar);
 280
 281
 282 // F
 283             yEnvPsave = yEnvP;
 284             yEnvMsave = yEnvM;
 285             yEnvP = (yEnvMsave + kYMIN * zRatio ) * zpm + kYMIN * zRatio;
 286             yEnvM = (yEnvPsave + kYMIN * zRatio ) * zmp + kYMIN * zRatio;
 287
 288             GetChamber(10+icount)->GetGeometry()->AddEnvelope(volEnv[0], true, TGeoTranslation(xEnv, yEnvM,kZm));
 289             GetChamber(10+icount)->GetGeometry()->AddEnvelope(volEnv[8], true, TGeoTranslation(-xEnv, yEnvP,kZp));
 290             GetChamber(10+icount)->GetGeometry()->AddEnvelope(volEnv[9], true, TGeoTranslation(xEnv,-yEnvM,kZm));
 291             GetChamber(10+icount)->GetGeometry()->AddEnvelope(volEnv[17], true, TGeoTranslation(-xEnv,-yEnvP,kZp));
 292
 293             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[0],iVolNum++,3,dpar);
 294             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[8],iVolNum++,3,dpar);
 295             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[9],iVolNum++,3,dpar);
 296             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[17],iVolNum++,3,dpar);
 297
 298         } // end loop on detection planes
 299     } // end loop on stations
 300 }
 301
 302 //______________________________________________________________________________
 303 void AliMUONTriggerGeometryBuilder::SetTransformations()
 304 {
 305 // Defines the transformations for the trigger chambers.
 306 // ---
 307     Double_t zpos1, zpos2;
 308     AliMUONChamber *iChamber1, *iChamber2;
 309
 310     iChamber1 = GetChamber(10);
 311     zpos1= - iChamber1->Z();
 312     iChamber1->GetGeometry()
 313         ->SetTranslation(TGeoTranslation(0., 0., zpos1));
 314
 315     iChamber2 = GetChamber(11);
 316     zpos2 = - iChamber2->Z();
 317     iChamber2->GetGeometry()
 318         ->SetTranslation(TGeoTranslation(0., 0., zpos2));
 319
 320     iChamber1 = GetChamber(12);
 321     zpos1 = - iChamber1->Z();
 322     iChamber1->GetGeometry()
 323         ->SetTranslation(TGeoTranslation(0., 0., zpos1));
 324
 325     iChamber2 = GetChamber(13);
 326     zpos2 = - iChamber2->Z();
 327     iChamber2->GetGeometry()
 328         ->SetTranslation(TGeoTranslation(0., 0., zpos2));
 329 }
 330
 331 //______________________________________________________________________________
 332 void AliMUONTriggerGeometryBuilder::SetSensitiveVolumes()
 333 {
 334 // Defines the sensitive volumes for trigger station chambers.
 335 // ---
 336
 337   GetChamber(10)->GetGeometry()->SetSensitiveVolume("SG1A");
 338   GetChamber(11)->GetGeometry()->SetSensitiveVolume("SG2A");
 339   GetChamber(12)->GetGeometry()->SetSensitiveVolume("SG3A");
 340   GetChamber(13)->GetGeometry()->SetSensitiveVolume("SG4A");
 341 }
 342