MUON/AliMUONTriggerGeometryBuilder.cxx

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