MUON/AliMUONTriggerGeometryBuilder.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 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=255.;
 113 // 090704 kXMAX changed from 272 to 255.
 114 // (see fig.2-4 & 2-5 of Local Trigger Board PRR)
 115 // segmentation updated accordingly
 116     const Float_t kYMIN=34.;
 117     const Float_t kYMAX=51.;
 118 // inner/outer radius of flange between beam shield. and chambers (1/station)
 119     const Float_t kRMIN[2]={50.,50.};
 120     const Float_t kRMAX[2]={64.,68.};
 121 // z position of the middle of the gas gap in mother vol
 122     const Float_t kZm=-3.6;
 123     const Float_t kZp=+3.6;
 124
 125     AliMUONChamber *iChamber, *iChamber1;
 126     iChamber1 = GetChamber(10);
 127     Float_t zpos1=-iChamber1->Z();
 128
 129 // ratio of zpos1m/zpos1p and inverse for first plane
 130     Float_t zmp=(zpos1-3.6)/(zpos1+3.6);
 131     Float_t zpm=1./zmp;
 132
 133     Int_t icount=0;  // chamber counter (0 1 2 3)
 134
 135     for (Int_t istation=0; istation<2; istation++) { // loop on stations
 136         for (Int_t iplane=0; iplane<2; iplane++) { // loop on detection planes
 137
 138             Int_t iVolNum=1; // counter Volume Number
 139             icount = Int_t(iplane*TMath::Power(2,0))+
 140                 Int_t(istation*TMath::Power(2,1));
 141
 142             iChamber = GetChamber(10+icount);
 143             Float_t zpos = - iChamber->Z();
 144
 145 // Flange between beam shielding and RPC
 146             tpar[0]= kRMIN[istation];
 147             tpar[1]= kRMAX[istation];
 148             tpar[2]= 4.0;
 149             char volFlange[5];
 150             sprintf(volFlange,"SF%dA",icount+1);
 151             gMC->Gsvolu(volFlange,"TUBE",idAlu1,tpar,3);     // Al
 152             // changed by ivana
 153             //gMC->Gspos(volFlange,1,"ALIC",0.,0.,zpos,0,"MANY");
 154             iChamber->GetGeometry()->AddEnvelope(volFlange, false, "MANY");
 155
 156 // scaling factor
 157             Float_t zRatio = zpos / zpos1;
 158
 159 // envelopes (same size except line 5, all virtual)
 160             char volEnv[18][5];
 161             tpar[1] = kYMIN * zRatio;
 162             tpar[2] = 0.4;
 163             Int_t i=0;    // counter
 164             for (Int_t icolumn=0; icolumn<2; icolumn++) {
 165                 for (Int_t iline=1; iline<10; iline++){
 166                     tpar[0] = (kXMAX/2.) * zRatio;
 167                     if (iline==5) tpar[0] = ((kXMAX-kXMED)/2.)*zRatio;
 168                     if (icolumn==0)
 169                         sprintf(volEnv[i],"S%dR%d",icount,iline);
 170                     else
 171                         sprintf(volEnv[i],"S%dL%d",icount,iline);
 172                     gMC->Gsvolu(volEnv[i],"BOX",idAir,tpar,0);
 173                     i++;
 174                 }
 175             }
 176
 177 // chamber prototype
 178             tpar[0]= 0.;
 179             tpar[1]= 0.;
 180             tpar[2]= 0.;
 181             char volAlu[5];     // Alu
 182             char volBak[5];     // Bakelite
 183             char volGaz[5];     // Gas streamer
 184             sprintf(volAlu,"SC%dA",icount+1);
 185             sprintf(volBak,"SB%dA",icount+1);
 186             sprintf(volGaz,"SG%dA",icount+1);
 187             gMC->Gsvolu(volAlu,"BOX",idAlu1,tpar,0);         // Al
 188             gMC->Gsvolu(volBak,"BOX",idtmed[1107],tpar,0);   // Bakelite
 189             gMC->Gsvolu(volGaz,"BOX",idtmed[1106],tpar,0);   // Gas streamer
 190             tpar[0] = -1.;
 191             tpar[1] = -1.;
 192             tpar[2] = 0.1;
 193             gMC->Gsposp(volGaz,1,volBak,0.,0.,0.,0,"ONLY",tpar,3);
 194             tpar[2] = 0.3;
 195             gMC->Gsposp(volBak,1,volAlu,0.,0.,0.,0,"ONLY",tpar,3);
 196
 197 // chamber type A
 198             Float_t xEnv = (kDXZERO+kXMED+(kXMAX-kXMED)/2.)*zRatio;
 199             Float_t yEnvM = 0.;  // y low position of envelope in chamber
 200             Float_t yEnvP = 0.;  // y up position of envelope in chamber
 201             Float_t yEnvPsave = 0.; // tmp data
 202             Float_t yEnvMsave = 0.; // tmp data
 203             Float_t xpos = 0.; // x position of RPC in envelope
 204             Float_t ypos = 0.; // y position of RPC in envelope
 205             dpar[2] = 0.4;
 206             dpar[0] = ((kXMAX-kXMED)/2.)*zRatio;
 207             dpar[1] = kYMIN * zRatio;
 208
 209             GetChamber(10+icount)->GetGeometry()->AddEnvelope(volEnv[4], true, TGeoTranslation(xEnv,yEnvM,kZm));
 210             GetChamber(10+icount)->GetGeometry()->AddEnvelope(volEnv[13], true, TGeoTranslation(-xEnv,yEnvP,kZp));
 211
 212             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[4],iVolNum++,3, dpar);
 213             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[13],iVolNum++,3, dpar);
 214
 215 // chamber type B (plus envelope chambers B & C)
 216             xEnv = (kDXZERO+kXMAX/2.)*zRatio;
 217             yEnvPsave = yEnvP;
 218             yEnvMsave = yEnvM;
 219             yEnvP = (yEnvMsave + kYMIN * zRatio ) * zpm + kYMIN * zRatio;
 220             yEnvM = (yEnvPsave + kYMIN * zRatio ) * zmp + kYMIN * zRatio;
 221             dpar[0] = ((kXMAX-kXMIN)/2.) * zRatio;
 222             dpar[1] = ((kYMAX-kYMIN)/2.) * zRatio;
 223             xpos = kXMIN/2. * zRatio;
 224             ypos = (kYMIN - kYMIN/4.) * zRatio;
 225
 226             GetChamber(10+icount)->GetGeometry()->AddEnvelope(volEnv[3], true, TGeoTranslation( xEnv,-yEnvP,kZp));
 227             GetChamber(10+icount)->GetGeometry()->AddEnvelope(volEnv[5], true, TGeoTranslation( xEnv, yEnvP,kZp));
 228             GetChamber(10+icount)->GetGeometry()->AddEnvelope(volEnv[12], true, TGeoTranslation(-xEnv,-yEnvM,kZm));
 229             GetChamber(10+icount)->GetGeometry()->AddEnvelope(volEnv[14], true, TGeoTranslation(-xEnv, yEnvM,kZm));
 230
 231             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[3],iVolNum++,TGeoTranslation(xpos, ypos,0.),3,dpar);
 232             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[5],iVolNum++,TGeoTranslation(xpos,-ypos,0.),3,dpar);
 233             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[12],iVolNum++,TGeoTranslation(-xpos, ypos,0.),3,dpar);
 234             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[14],iVolNum++,TGeoTranslation(-xpos,-ypos,0.),3,dpar);
 235
 236 // chamber type C (note: same Z than type B)
 237             dpar[0] = (kXMAX/2)*zRatio;
 238             dpar[1] = (kYMAX/2)*zRatio;
 239             xpos = 0.;
 240             ypos = ((kYMAX - kYMIN)/2.) * zRatio;
 241
 242             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[3],iVolNum++,TGeoTranslation(xpos,-ypos,0.),3,dpar);
 243             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[5],iVolNum++,TGeoTranslation(xpos, ypos,0.),3,dpar);
 244             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[12],iVolNum++,TGeoTranslation(-xpos,-ypos,0.),3,dpar);
 245             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[14],iVolNum++,TGeoTranslation(-xpos, ypos,0.),3,dpar);
 246
 247 // chamber type D, E and F (same size)
 248 // D
 249             yEnvPsave = yEnvP;
 250             yEnvMsave = yEnvM;
 251             yEnvP = (yEnvMsave + kYMIN * zRatio ) * zpm + kYMIN * zRatio;
 252             yEnvM = (yEnvPsave + kYMIN * zRatio ) * zmp + kYMIN * zRatio;
 253             dpar[0] = (kXMAX/2.)*zRatio;
 254             dpar[1] =  kYMIN*zRatio;
 255
 256             GetChamber(10+icount)->GetGeometry()->AddEnvelope(volEnv[2], true, TGeoTranslation(xEnv,-yEnvM,kZm));
 257             GetChamber(10+icount)->GetGeometry()->AddEnvelope(volEnv[6], true, TGeoTranslation(xEnv, yEnvM,kZm));
 258             GetChamber(10+icount)->GetGeometry()->AddEnvelope(volEnv[11], true, TGeoTranslation(-xEnv,-yEnvP,kZp));
 259             GetChamber(10+icount)->GetGeometry()->AddEnvelope(volEnv[15], true, TGeoTranslation(-xEnv, yEnvP,kZp));
 260
 261             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[2],iVolNum++,3, dpar);
 262             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[6],iVolNum++,3, dpar);
 263             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[11],iVolNum++,3, dpar);
 264             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[15],iVolNum++,3, dpar);
 265
 266 // E
 267             yEnvPsave = yEnvP;
 268             yEnvMsave = yEnvM;
 269             yEnvP = (yEnvMsave + kYMIN * zRatio ) * zpm + kYMIN * zRatio;
 270             yEnvM = (yEnvPsave + kYMIN * zRatio ) * zmp + kYMIN * zRatio;
 271
 272             GetChamber(10+icount)->GetGeometry()->AddEnvelope(volEnv[1], true, TGeoTranslation(xEnv,-yEnvP,kZp));
 273             GetChamber(10+icount)->GetGeometry()->AddEnvelope(volEnv[7], true, TGeoTranslation(xEnv, yEnvP,kZp));
 274             GetChamber(10+icount)->GetGeometry()->AddEnvelope(volEnv[10], true, TGeoTranslation(-xEnv,-yEnvM,kZm));
 275             GetChamber(10+icount)->GetGeometry()->AddEnvelope(volEnv[16], true, TGeoTranslation(-xEnv, yEnvM,kZm));
 276
 277             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[1],iVolNum++,3,dpar);
 278             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[7],iVolNum++,3,dpar);
 279             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[10],iVolNum++,3,dpar);
 280             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[16],iVolNum++,3,dpar);
 281
 282
 283 // F
 284             yEnvPsave = yEnvP;
 285             yEnvMsave = yEnvM;
 286             yEnvP = (yEnvMsave + kYMIN * zRatio ) * zpm + kYMIN * zRatio;
 287             yEnvM = (yEnvPsave + kYMIN * zRatio ) * zmp + kYMIN * zRatio;
 288
 289             GetChamber(10+icount)->GetGeometry()->AddEnvelope(volEnv[0], true, TGeoTranslation(xEnv,-yEnvM,kZm));
 290             GetChamber(10+icount)->GetGeometry()->AddEnvelope(volEnv[8], true, TGeoTranslation(xEnv, yEnvM,kZm));
 291             GetChamber(10+icount)->GetGeometry()->AddEnvelope(volEnv[9], true, TGeoTranslation(-xEnv,-yEnvP,kZp));
 292             GetChamber(10+icount)->GetGeometry()->AddEnvelope(volEnv[17], true, TGeoTranslation(-xEnv, yEnvP,kZp));
 293
 294             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[0],iVolNum++,3,dpar);
 295             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[8],iVolNum++,3,dpar);
 296             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[9],iVolNum++,3,dpar);
 297             GetChamber(10+icount)->GetGeometry()->AddEnvelopeConstituentParam(volAlu,volEnv[17],iVolNum++,3,dpar);
 298
 299         } // end loop on detection planes
 300     } // end loop on stations
 301 }
 302
 303 //______________________________________________________________________________
 304 void AliMUONTriggerGeometryBuilder::SetTransformations()
 305 {
 306 // Defines the transformations for the trigger chambers.
 307 // ---
 308     Double_t zpos1, zpos2;
 309     AliMUONChamber *iChamber1, *iChamber2;
 310
 311     iChamber1 = GetChamber(10);
 312     zpos1= - iChamber1->Z();
 313     iChamber1->GetGeometry()
 314         ->SetTranslation(TGeoTranslation(0., 0., zpos1));
 315
 316     iChamber2 = GetChamber(11);
 317     zpos2 = - iChamber2->Z();
 318     iChamber2->GetGeometry()
 319         ->SetTranslation(TGeoTranslation(0., 0., zpos2));
 320
 321     iChamber1 = GetChamber(12);
 322     zpos1 = - iChamber1->Z();
 323     iChamber1->GetGeometry()
 324         ->SetTranslation(TGeoTranslation(0., 0., zpos1));
 325
 326     iChamber2 = GetChamber(13);
 327     zpos2 = - iChamber2->Z();
 328     iChamber2->GetGeometry()
 329         ->SetTranslation(TGeoTranslation(0., 0., zpos2));
 330 }
 331
 332 //______________________________________________________________________________
 333 void AliMUONTriggerGeometryBuilder::SetSensitiveVolumes()
 334 {
 335 // Defines the sensitive volumes for trigger station chambers.
 336 // ---
 337
 338   GetChamber(10)->GetGeometry()->SetSensitiveVolume("SG1A");
 339   GetChamber(11)->GetGeometry()->SetSensitiveVolume("SG2A");
 340   GetChamber(12)->GetGeometry()->SetSensitiveVolume("SG3A");
 341   GetChamber(13)->GetGeometry()->SetSensitiveVolume("SG4A");
 342 }
 343