MUON/AliMUONv1.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   *
   8  * documentation strictly for non-commercial purposes is hereby granted   *
   9  * without fee, provided that the above copyright notice appears in all   *
  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 purpeateose. It is      *
  13  * provided "as is" without express or implied warranty.                  *
  14  **************************************************************************/
  15
  16 /*
  17 $Log$
  18 Revision 1.23  2001/01/18 15:23:49  egangler
  19 Bug correction in StepManager :
  20 Now the systematic offset with angle is cured
  21
  22 Revision 1.22  2001/01/17 21:01:21  hristov
  23 Unused variable removed
  24
  25 Revision 1.21  2000/12/20 13:00:22  egangler
  26
  27 Added charge correlation between cathods.
  28 In Config_slat.C, use
  29  MUON->Chamber(chamber-1).SetChargeCorrel(0.11); to set the RMS of
  30  q1/q2 to 11 % (number from Alberto)
  31  This is stored in AliMUONChamber fChargeCorrel member.
  32  At generation time, when a tracks enters the volume,
  33  AliMUONv1::StepManager calls
  34  AliMUONChamber::ChargeCorrelationInit() to set the current value of
  35  fCurrentCorrel which is then used at Disintegration level to scale
  36  appropriately the PadHit charges.
  37
  38 Revision 1.20  2000/12/04 17:48:23  gosset
  39 Modifications for stations 1 et 2 mainly:
  40 * station 1 with 4 mm gas gap and smaller cathode segmentation...
  41 * stations 1 and 2 with "grey" frame crosses
  42 * mean noise at 1.5 ADC channel
  43 * Ar-CO2 gas (80%+20%)
  44
  45 Revision 1.19  2000/12/02 17:15:46  morsch
  46 Correction of dead zones in inner regions of stations 3-5
  47 Correction of length of slats 3 and 9 of station 4.
  48
  49 Revision 1.17  2000/11/24 12:57:10  morsch
  50 New version of geometry for stations 3-5 "Slats" (A. de Falco)
  51  - sensitive region at station 3 inner radius
  52  - improved volume tree structure
  53
  54 Revision 1.16  2000/11/08 13:01:40  morsch
  55 Chamber half-planes of stations 3-5 at different z-positions.
  56
  57 Revision 1.15  2000/11/06 11:39:02  morsch
  58 Bug in StepManager() corrected.
  59
  60 Revision 1.14  2000/11/06 09:16:50  morsch
  61 Avoid overlap of slat volumes.
  62
  63 Revision 1.13  2000/10/26 07:33:44  morsch
  64 Correct x-position of slats in station 5.
  65
  66 Revision 1.12  2000/10/25 19:55:35  morsch
  67 Switches for each station individually for debug and lego.
  68
  69 Revision 1.11  2000/10/22 16:44:01  morsch
  70 Update of slat geometry for stations 3,4,5 (A. deFalco)
  71
  72 Revision 1.10  2000/10/12 16:07:04  gosset
  73 StepManager:
  74 * SigGenCond only called for tracking chambers,
  75   hence no more division by 0,
  76   and may use last ALIROOT/dummies.C with exception handling;
  77 * "10" replaced by "AliMUONConstants::NTrackingCh()".
  78
  79 Revision 1.9  2000/10/06 15:37:22  morsch
  80 Problems with variable redefinition in for-loop solved.
  81 Variable names starting with u-case letters changed to l-case.
  82
  83 Revision 1.8  2000/10/06 09:06:31  morsch
  84 Include Slat chambers (stations 3-5) into geometry (A. de Falco)
  85
  86 Revision 1.7  2000/10/02 21:28:09  fca
  87 Removal of useless dependecies via forward declarations
  88
  89 Revision 1.6  2000/10/02 17:20:45  egangler
  90 Cleaning of the code (continued ) :
  91 -> coding conventions
  92 -> void Streamers
  93 -> some useless includes removed or replaced by "class" statement
  94
  95 Revision 1.5  2000/06/28 15:16:35  morsch
  96 (1) Client code adapted to new method signatures in AliMUONSegmentation (see comments there)
  97 to allow development of slat-muon chamber simulation and reconstruction code in the MUON
  98 framework. The changes should have no side effects (mostly dummy arguments).
  99 (2) Hit disintegration uses 3-dim hit coordinates to allow simulation
 100 of chambers with overlapping modules (MakePadHits, Disintegration).
 101
 102 Revision 1.4  2000/06/26 14:02:38  morsch
 103 Add class AliMUONConstants with MUON specific constants using static memeber data and access methods.
 104
 105 Revision 1.3  2000/06/22 14:10:05  morsch
 106 HP scope problems corrected (PH)
 107
 108 Revision 1.2  2000/06/15 07:58:49  morsch
 109 Code from MUON-dev joined
 110
 111 Revision 1.1.2.14  2000/06/14 14:37:25  morsch
 112 Initialization of TriggerCircuit added (PC)
 113
 114 Revision 1.1.2.13  2000/06/09 21:55:47  morsch
 115 Most coding rule violations corrected.
 116
 117 Revision 1.1.2.12  2000/05/05 11:34:29  morsch
 118 Log inside comments.
 119
 120 Revision 1.1.2.11  2000/05/05 10:06:48  morsch
 121 Coding Rule violations regarding trigger section corrected (CP)
 122 Log messages included.
 123 */
 124
 125 /////////////////////////////////////////////////////////
 126 //  Manager and hits classes for set:MUON version 0    //
 127 /////////////////////////////////////////////////////////
 128
 129 #include <TTUBE.h>
 130 #include <TNode.h>
 131 #include <TRandom.h>
 132 #include <TLorentzVector.h>
 133 #include <iostream.h>
 134
 135 #include "AliMUONv1.h"
 136 #include "AliRun.h"
 137 #include "AliMC.h"
 138 #include "AliMagF.h"
 139 #include "AliCallf77.h"
 140 #include "AliConst.h"
 141 #include "AliMUONChamber.h"
 142 #include "AliMUONHit.h"
 143 #include "AliMUONPadHit.h"
 144 #include "AliMUONConstants.h"
 145 #include "AliMUONTriggerCircuit.h"
 146
 147 ClassImp(AliMUONv1)
 148
 149 //___________________________________________
 150 AliMUONv1::AliMUONv1() : AliMUON()
 151 {
 152 // Constructor
 153     fChambers = 0;
 154 }
 155
 156 //___________________________________________
 157 AliMUONv1::AliMUONv1(const char *name, const char *title)
 158        : AliMUON(name,title)
 159 {
 160 // Constructor
 161 }
 162
 163 //___________________________________________
 164 void AliMUONv1::CreateGeometry()
 165 {
 166 //
 167 //   Note: all chambers have the same structure, which could be
 168 //   easily parameterised. This was intentionally not done in order
 169 //   to give a starting point for the implementation of the actual
 170 //   design of each station.
 171   Int_t *idtmed = fIdtmed->GetArray()-1099;
 172
 173 //   Distance between Stations
 174 //
 175      Float_t bpar[3];
 176      Float_t tpar[3];
 177 //      Float_t pgpar[10];
 178      Float_t zpos1, zpos2, zfpos;
 179      // Outer excess and inner recess for mother volume radius
 180      // with respect to ROuter and RInner
 181      Float_t dframep=.001; // Value for station 3 should be 6 ...
 182      // Width (RdPhi) of the frame crosses for stations 1 and 2 (cm)
 183 //      Float_t dframep1=.001;
 184      Float_t dframep1 = 11.0;
 185 //      Bool_t frameCrosses=kFALSE;
 186      Bool_t frameCrosses=kTRUE;
 187
 188 //      Float_t dframez=0.9;
 189      // Half of the total thickness of frame crosses (including DAlu)
 190      // for each chamber in stations 1 and 2:
 191      // 3% of X0 of composite material,
 192      // but taken as Aluminium here, with same thickness in number of X0
 193      Float_t dframez = 3. * 8.9 / 100;
 194 //      Float_t dr;
 195      Float_t dstation;
 196
 197 //
 198 //   Rotation matrices in the x-y plane
 199      Int_t idrotm[1199];
 200 //   phi=   0 deg
 201      AliMatrix(idrotm[1100],  90.,   0., 90.,  90., 0., 0.);
 202 //   phi=  90 deg
 203      AliMatrix(idrotm[1101],  90.,  90., 90., 180., 0., 0.);
 204 //   phi= 180 deg
 205      AliMatrix(idrotm[1102],  90., 180., 90., 270., 0., 0.);
 206 //   phi= 270 deg
 207      AliMatrix(idrotm[1103],  90., 270., 90.,   0., 0., 0.);
 208 //
 209      Float_t phi=2*TMath::Pi()/12/2;
 210
 211 //
 212 //   pointer to the current chamber
 213 //   pointer to the current chamber
 214      Int_t idAlu1=idtmed[1103]; // medium 4
 215      Int_t idAlu2=idtmed[1104]; // medium 5
 216 //     Int_t idAlu1=idtmed[1100];
 217 //     Int_t idAlu2=idtmed[1100];
 218      Int_t idAir=idtmed[1100]; // medium 1
 219 //      Int_t idGas=idtmed[1105]; // medium 6 = Ar-isoC4H10 gas
 220      Int_t idGas=idtmed[1108]; // medium 9 = Ar-CO2 gas (80%+20%)
 221
 222
 223      AliMUONChamber *iChamber, *iChamber1, *iChamber2;
 224      Int_t stations[5] = {1, 1, 1, 1, 1};
 225
 226      if (stations[0]) {
 227
 228 //********************************************************************
 229 //                            Station 1                             **
 230 //********************************************************************
 231 //  CONCENTRIC
 232      // indices 1 and 2 for first and second chambers in the station
 233      // iChamber (first chamber) kept for other quanties than Z,
 234      // assumed to be the same in both chambers
 235      iChamber1 = iChamber = (AliMUONChamber*) (*fChambers)[0];
 236      iChamber2 =(AliMUONChamber*) (*fChambers)[1];
 237      zpos1=iChamber1->Z();
 238      zpos2=iChamber2->Z();
 239      dstation = zpos2 - zpos1;
 240      // DGas decreased from standard one (0.5)
 241      iChamber->SetDGas(0.4); iChamber2->SetDGas(0.4);
 242      // DAlu increased from standard one (3% of X0),
 243      // because more electronics with smaller pads
 244      iChamber->SetDAlu(3.5 * 8.9 / 100.); iChamber2->SetDAlu(3.5 * 8.9 / 100.);
 245      zfpos=-(iChamber->DGas()+dframez+iChamber->DAlu())/2;
 246
 247 //
 248 //   Mother volume
 249      tpar[0] = iChamber->RInner()-dframep;
 250      tpar[1] = (iChamber->ROuter()+dframep)/TMath::Cos(phi);
 251      tpar[2] = dstation/5;
 252
 253      gMC->Gsvolu("C01M", "TUBE", idAir, tpar, 3);
 254      gMC->Gsvolu("C02M", "TUBE", idAir, tpar, 3);
 255      gMC->Gspos("C01M", 1, "ALIC", 0., 0., zpos1 , 0, "ONLY");
 256      gMC->Gspos("C02M", 1, "ALIC", 0., 0., zpos2 , 0, "ONLY");
 257 // // Aluminium frames
 258 // // Outer frames
 259 //      pgpar[0] = 360/12/2;
 260 //      pgpar[1] = 360.;
 261 //      pgpar[2] = 12.;
 262 //      pgpar[3] =   2;
 263 //      pgpar[4] = -dframez/2;
 264 //      pgpar[5] = iChamber->ROuter();
 265 //      pgpar[6] = pgpar[5]+dframep1;
 266 //      pgpar[7] = +dframez/2;
 267 //      pgpar[8] = pgpar[5];
 268 //      pgpar[9] = pgpar[6];
 269 //      gMC->Gsvolu("C01O", "PGON", idAlu1, pgpar, 10);
 270 //      gMC->Gsvolu("C02O", "PGON", idAlu1, pgpar, 10);
 271 //      gMC->Gspos("C01O",1,"C01M", 0.,0.,-zfpos,  0,"ONLY");
 272 //      gMC->Gspos("C01O",2,"C01M", 0.,0.,+zfpos,  0,"ONLY");
 273 //      gMC->Gspos("C02O",1,"C02M", 0.,0.,-zfpos,  0,"ONLY");
 274 //      gMC->Gspos("C02O",2,"C02M", 0.,0.,+zfpos,  0,"ONLY");
 275 // //
 276 // // Inner frame
 277 //      tpar[0]= iChamber->RInner()-dframep1;
 278 //      tpar[1]= iChamber->RInner();
 279 //      tpar[2]= dframez/2;
 280 //      gMC->Gsvolu("C01I", "TUBE", idAlu1, tpar, 3);
 281 //      gMC->Gsvolu("C02I", "TUBE", idAlu1, tpar, 3);
 282
 283 //      gMC->Gspos("C01I",1,"C01M", 0.,0.,-zfpos,  0,"ONLY");
 284 //      gMC->Gspos("C01I",2,"C01M", 0.,0.,+zfpos,  0,"ONLY");
 285 //      gMC->Gspos("C02I",1,"C02M", 0.,0.,-zfpos,  0,"ONLY");
 286 //      gMC->Gspos("C02I",2,"C02M", 0.,0.,+zfpos,  0,"ONLY");
 287 //
 288 // Frame Crosses
 289      if (frameCrosses) {
 290          // outside gas
 291          // security for inside mother volume
 292          bpar[0] = (iChamber->ROuter() - iChamber->RInner())
 293            * TMath::Cos(TMath::ASin(dframep1 /
 294                                    (iChamber->ROuter() - iChamber->RInner())))
 295            / 2.0;
 296          bpar[1] = dframep1/2;
 297          // total thickness will be (4 * bpar[2]) for each chamber,
 298          // which has to be equal to (2 * dframez) - DAlu
 299          bpar[2] = (2.0 * dframez - iChamber->DAlu()) / 4.0;
 300          gMC->Gsvolu("C01B", "BOX", idAlu1, bpar, 3);
 301          gMC->Gsvolu("C02B", "BOX", idAlu1, bpar, 3);
 302
 303          gMC->Gspos("C01B",1,"C01M", +iChamber->RInner()+bpar[0] , 0,-zfpos,
 304                     idrotm[1100],"ONLY");
 305          gMC->Gspos("C01B",2,"C01M", -iChamber->RInner()-bpar[0] , 0,-zfpos,
 306                     idrotm[1100],"ONLY");
 307          gMC->Gspos("C01B",3,"C01M", 0, +iChamber->RInner()+bpar[0] ,-zfpos,
 308                     idrotm[1101],"ONLY");
 309          gMC->Gspos("C01B",4,"C01M", 0, -iChamber->RInner()-bpar[0] ,-zfpos,
 310                     idrotm[1101],"ONLY");
 311          gMC->Gspos("C01B",5,"C01M", +iChamber->RInner()+bpar[0] , 0,+zfpos,
 312                     idrotm[1100],"ONLY");
 313          gMC->Gspos("C01B",6,"C01M", -iChamber->RInner()-bpar[0] , 0,+zfpos,
 314                     idrotm[1100],"ONLY");
 315          gMC->Gspos("C01B",7,"C01M", 0, +iChamber->RInner()+bpar[0] ,+zfpos,
 316                     idrotm[1101],"ONLY");
 317          gMC->Gspos("C01B",8,"C01M", 0, -iChamber->RInner()-bpar[0] ,+zfpos,
 318                     idrotm[1101],"ONLY");
 319
 320          gMC->Gspos("C02B",1,"C02M", +iChamber->RInner()+bpar[0] , 0,-zfpos,
 321                     idrotm[1100],"ONLY");
 322          gMC->Gspos("C02B",2,"C02M", -iChamber->RInner()-bpar[0] , 0,-zfpos,
 323                     idrotm[1100],"ONLY");
 324          gMC->Gspos("C02B",3,"C02M", 0, +iChamber->RInner()+bpar[0] ,-zfpos,
 325                     idrotm[1101],"ONLY");
 326          gMC->Gspos("C02B",4,"C02M", 0, -iChamber->RInner()-bpar[0] ,-zfpos,
 327                     idrotm[1101],"ONLY");
 328          gMC->Gspos("C02B",5,"C02M", +iChamber->RInner()+bpar[0] , 0,+zfpos,
 329                     idrotm[1100],"ONLY");
 330          gMC->Gspos("C02B",6,"C02M", -iChamber->RInner()-bpar[0] , 0,+zfpos,
 331                     idrotm[1100],"ONLY");
 332          gMC->Gspos("C02B",7,"C02M", 0, +iChamber->RInner()+bpar[0] ,+zfpos,
 333                     idrotm[1101],"ONLY");
 334          gMC->Gspos("C02B",8,"C02M", 0, -iChamber->RInner()-bpar[0] ,+zfpos,
 335                     idrotm[1101],"ONLY");
 336      }
 337 //
 338 //   Chamber Material represented by Alu sheet
 339      tpar[0]= iChamber->RInner();
 340      tpar[1]= iChamber->ROuter();
 341      tpar[2] = (iChamber->DGas()+iChamber->DAlu())/2;
 342      gMC->Gsvolu("C01A", "TUBE",  idAlu2, tpar, 3);
 343      gMC->Gsvolu("C02A", "TUBE",idAlu2, tpar, 3);
 344      gMC->Gspos("C01A", 1, "C01M", 0., 0., 0.,  0, "ONLY");
 345      gMC->Gspos("C02A", 1, "C02M", 0., 0., 0.,  0, "ONLY");
 346 //
 347 //   Sensitive volumes
 348      // tpar[2] = iChamber->DGas();
 349      tpar[2] = iChamber->DGas()/2;
 350      gMC->Gsvolu("C01G", "TUBE", idGas, tpar, 3);
 351      gMC->Gsvolu("C02G", "TUBE", idGas, tpar, 3);
 352      gMC->Gspos("C01G", 1, "C01A", 0., 0., 0.,  0, "ONLY");
 353      gMC->Gspos("C02G", 1, "C02A", 0., 0., 0.,  0, "ONLY");
 354 //
 355 // Frame Crosses to be placed inside gas
 356      // NONE: chambers are sensitive everywhere
 357 //      if (frameCrosses) {
 358
 359 //       dr = (iChamber->ROuter() - iChamber->RInner());
 360 //       bpar[0] = TMath::Sqrt(dr*dr-dframep1*dframep1/4)/2;
 361 //       bpar[1] = dframep1/2;
 362 //       bpar[2] = iChamber->DGas()/2;
 363 //       gMC->Gsvolu("C01F", "BOX", idAlu1, bpar, 3);
 364 //       gMC->Gsvolu("C02F", "BOX", idAlu1, bpar, 3);
 365
 366 //       gMC->Gspos("C01F",1,"C01G", +iChamber->RInner()+bpar[0] , 0, 0,
 367 //                  idrotm[1100],"ONLY");
 368 //       gMC->Gspos("C01F",2,"C01G", -iChamber->RInner()-bpar[0] , 0, 0,
 369 //                  idrotm[1100],"ONLY");
 370 //       gMC->Gspos("C01F",3,"C01G", 0, +iChamber->RInner()+bpar[0] , 0,
 371 //                  idrotm[1101],"ONLY");
 372 //       gMC->Gspos("C01F",4,"C01G", 0, -iChamber->RInner()-bpar[0] , 0,
 373 //                  idrotm[1101],"ONLY");
 374
 375 //       gMC->Gspos("C02F",1,"C02G", +iChamber->RInner()+bpar[0] , 0, 0,
 376 //                  idrotm[1100],"ONLY");
 377 //       gMC->Gspos("C02F",2,"C02G", -iChamber->RInner()-bpar[0] , 0, 0,
 378 //                  idrotm[1100],"ONLY");
 379 //       gMC->Gspos("C02F",3,"C02G", 0, +iChamber->RInner()+bpar[0] , 0,
 380 //                  idrotm[1101],"ONLY");
 381 //       gMC->Gspos("C02F",4,"C02G", 0, -iChamber->RInner()-bpar[0] , 0,
 382 //                  idrotm[1101],"ONLY");
 383 //      }
 384      }
 385      if (stations[1]) {
 386
 387 //********************************************************************
 388 //                            Station 2                             **
 389 //********************************************************************
 390      // indices 1 and 2 for first and second chambers in the station
 391      // iChamber (first chamber) kept for other quanties than Z,
 392      // assumed to be the same in both chambers
 393      iChamber1 = iChamber = (AliMUONChamber*) (*fChambers)[2];
 394      iChamber2 =(AliMUONChamber*) (*fChambers)[3];
 395      zpos1=iChamber1->Z();
 396      zpos2=iChamber2->Z();
 397      dstation = zpos2 - zpos1;
 398      // DGas and DAlu not changed from standard values
 399      zfpos=-(iChamber->DGas()+dframez+iChamber->DAlu())/2;
 400
 401 //
 402 //   Mother volume
 403      tpar[0] = iChamber->RInner()-dframep;
 404      tpar[1] = (iChamber->ROuter()+dframep)/TMath::Cos(phi);
 405      tpar[2] = dstation/5;
 406
 407      gMC->Gsvolu("C03M", "TUBE", idAir, tpar, 3);
 408      gMC->Gsvolu("C04M", "TUBE", idAir, tpar, 3);
 409      gMC->Gspos("C03M", 1, "ALIC", 0., 0., zpos1 , 0, "ONLY");
 410      gMC->Gspos("C04M", 1, "ALIC", 0., 0., zpos2 , 0, "ONLY");
 411
 412 // // Aluminium frames
 413 // // Outer frames
 414 //      pgpar[0] = 360/12/2;
 415 //      pgpar[1] = 360.;
 416 //      pgpar[2] = 12.;
 417 //      pgpar[3] =   2;
 418 //      pgpar[4] = -dframez/2;
 419 //      pgpar[5] = iChamber->ROuter();
 420 //      pgpar[6] = pgpar[5]+dframep;
 421 //      pgpar[7] = +dframez/2;
 422 //      pgpar[8] = pgpar[5];
 423 //      pgpar[9] = pgpar[6];
 424 //      gMC->Gsvolu("C03O", "PGON", idAlu1, pgpar, 10);
 425 //      gMC->Gsvolu("C04O", "PGON", idAlu1, pgpar, 10);
 426 //      gMC->Gspos("C03O",1,"C03M", 0.,0.,-zfpos,  0,"ONLY");
 427 //      gMC->Gspos("C03O",2,"C03M", 0.,0.,+zfpos,  0,"ONLY");
 428 //      gMC->Gspos("C04O",1,"C04M", 0.,0.,-zfpos,  0,"ONLY");
 429 //      gMC->Gspos("C04O",2,"C04M", 0.,0.,+zfpos,  0,"ONLY");
 430 // //
 431 // // Inner frame
 432 //      tpar[0]= iChamber->RInner()-dframep;
 433 //      tpar[1]= iChamber->RInner();
 434 //      tpar[2]= dframez/2;
 435 //      gMC->Gsvolu("C03I", "TUBE", idAlu1, tpar, 3);
 436 //      gMC->Gsvolu("C04I", "TUBE", idAlu1, tpar, 3);
 437
 438 //      gMC->Gspos("C03I",1,"C03M", 0.,0.,-zfpos,  0,"ONLY");
 439 //      gMC->Gspos("C03I",2,"C03M", 0.,0.,+zfpos,  0,"ONLY");
 440 //      gMC->Gspos("C04I",1,"C04M", 0.,0.,-zfpos,  0,"ONLY");
 441 //      gMC->Gspos("C04I",2,"C04M", 0.,0.,+zfpos,  0,"ONLY");
 442 //
 443 // Frame Crosses
 444      if (frameCrosses) {
 445          // outside gas
 446          // security for inside mother volume
 447          bpar[0] = (iChamber->ROuter() - iChamber->RInner())
 448            * TMath::Cos(TMath::ASin(dframep1 /
 449                                    (iChamber->ROuter() - iChamber->RInner())))
 450            / 2.0;
 451          bpar[1] = dframep1/2;
 452          // total thickness will be (4 * bpar[2]) for each chamber,
 453          // which has to be equal to (2 * dframez) - DAlu
 454          bpar[2] = (2.0 * dframez - iChamber->DAlu()) / 4.0;
 455          gMC->Gsvolu("C03B", "BOX", idAlu1, bpar, 3);
 456          gMC->Gsvolu("C04B", "BOX", idAlu1, bpar, 3);
 457
 458          gMC->Gspos("C03B",1,"C03M", +iChamber->RInner()+bpar[0] , 0,-zfpos,
 459                     idrotm[1100],"ONLY");
 460          gMC->Gspos("C03B",2,"C03M", -iChamber->RInner()-bpar[0] , 0,-zfpos,
 461                     idrotm[1100],"ONLY");
 462          gMC->Gspos("C03B",3,"C03M", 0, +iChamber->RInner()+bpar[0] ,-zfpos,
 463                     idrotm[1101],"ONLY");
 464          gMC->Gspos("C03B",4,"C03M", 0, -iChamber->RInner()-bpar[0] ,-zfpos,
 465                     idrotm[1101],"ONLY");
 466          gMC->Gspos("C03B",5,"C03M", +iChamber->RInner()+bpar[0] , 0,+zfpos,
 467                     idrotm[1100],"ONLY");
 468          gMC->Gspos("C03B",6,"C03M", -iChamber->RInner()-bpar[0] , 0,+zfpos,
 469                     idrotm[1100],"ONLY");
 470          gMC->Gspos("C03B",7,"C03M", 0, +iChamber->RInner()+bpar[0] ,+zfpos,
 471                     idrotm[1101],"ONLY");
 472          gMC->Gspos("C03B",8,"C03M", 0, -iChamber->RInner()-bpar[0] ,+zfpos,
 473                     idrotm[1101],"ONLY");
 474
 475          gMC->Gspos("C04B",1,"C04M", +iChamber->RInner()+bpar[0] , 0,-zfpos,
 476                     idrotm[1100],"ONLY");
 477          gMC->Gspos("C04B",2,"C04M", -iChamber->RInner()-bpar[0] , 0,-zfpos,
 478                     idrotm[1100],"ONLY");
 479          gMC->Gspos("C04B",3,"C04M", 0, +iChamber->RInner()+bpar[0] ,-zfpos,
 480                     idrotm[1101],"ONLY");
 481          gMC->Gspos("C04B",4,"C04M", 0, -iChamber->RInner()-bpar[0] ,-zfpos,
 482                     idrotm[1101],"ONLY");
 483          gMC->Gspos("C04B",5,"C04M", +iChamber->RInner()+bpar[0] , 0,+zfpos,
 484                     idrotm[1100],"ONLY");
 485          gMC->Gspos("C04B",6,"C04M", -iChamber->RInner()-bpar[0] , 0,+zfpos,
 486                     idrotm[1100],"ONLY");
 487          gMC->Gspos("C04B",7,"C04M", 0, +iChamber->RInner()+bpar[0] ,+zfpos,
 488                     idrotm[1101],"ONLY");
 489          gMC->Gspos("C04B",8,"C04M", 0, -iChamber->RInner()-bpar[0] ,+zfpos,
 490                     idrotm[1101],"ONLY");
 491      }
 492 //
 493 //   Chamber Material represented by Alu sheet
 494      tpar[0]= iChamber->RInner();
 495      tpar[1]= iChamber->ROuter();
 496      tpar[2] = (iChamber->DGas()+iChamber->DAlu())/2;
 497      gMC->Gsvolu("C03A", "TUBE", idAlu2, tpar, 3);
 498      gMC->Gsvolu("C04A", "TUBE", idAlu2, tpar, 3);
 499      gMC->Gspos("C03A", 1, "C03M", 0., 0., 0.,  0, "ONLY");
 500      gMC->Gspos("C04A", 1, "C04M", 0., 0., 0.,  0, "ONLY");
 501 //
 502 //   Sensitive volumes
 503      // tpar[2] = iChamber->DGas();
 504      tpar[2] = iChamber->DGas()/2;
 505      gMC->Gsvolu("C03G", "TUBE", idGas, tpar, 3);
 506      gMC->Gsvolu("C04G", "TUBE", idGas, tpar, 3);
 507      gMC->Gspos("C03G", 1, "C03A", 0., 0., 0.,  0, "ONLY");
 508      gMC->Gspos("C04G", 1, "C04A", 0., 0., 0.,  0, "ONLY");
 509 //
 510 // Frame Crosses to be placed inside gas
 511      // NONE: chambers are sensitive everywhere
 512 //      if (frameCrosses) {
 513
 514 //       dr = (iChamber->ROuter() - iChamber->RInner());
 515 //       bpar[0] = TMath::Sqrt(dr*dr-dframep1*dframep1/4)/2;
 516 //       bpar[1] = dframep1/2;
 517 //       bpar[2] = iChamber->DGas()/2;
 518 //       gMC->Gsvolu("C03F", "BOX", idAlu1, bpar, 3);
 519 //       gMC->Gsvolu("C04F", "BOX", idAlu1, bpar, 3);
 520
 521 //       gMC->Gspos("C03F",1,"C03G", +iChamber->RInner()+bpar[0] , 0, 0,
 522 //                  idrotm[1100],"ONLY");
 523 //       gMC->Gspos("C03F",2,"C03G", -iChamber->RInner()-bpar[0] , 0, 0,
 524 //                  idrotm[1100],"ONLY");
 525 //       gMC->Gspos("C03F",3,"C03G", 0, +iChamber->RInner()+bpar[0] , 0,
 526 //                  idrotm[1101],"ONLY");
 527 //       gMC->Gspos("C03F",4,"C03G", 0, -iChamber->RInner()-bpar[0] , 0,
 528 //                  idrotm[1101],"ONLY");
 529
 530 //       gMC->Gspos("C04F",1,"C04G", +iChamber->RInner()+bpar[0] , 0, 0,
 531 //                  idrotm[1100],"ONLY");
 532 //       gMC->Gspos("C04F",2,"C04G", -iChamber->RInner()-bpar[0] , 0, 0,
 533 //                  idrotm[1100],"ONLY");
 534 //       gMC->Gspos("C04F",3,"C04G", 0, +iChamber->RInner()+bpar[0] , 0,
 535 //                  idrotm[1101],"ONLY");
 536 //       gMC->Gspos("C04F",4,"C04G", 0, -iChamber->RInner()-bpar[0] , 0,
 537 //                  idrotm[1101],"ONLY");
 538 //      }
 539      }
 540      // define the id of tracking media:
 541      Int_t idCopper = idtmed[1110];
 542      Int_t idGlass  = idtmed[1111];
 543      Int_t idCarbon = idtmed[1112];
 544      Int_t idRoha   = idtmed[1113];
 545
 546       // sensitive area: 40*40 cm**2
 547      const Float_t sensLength = 40.;
 548      const Float_t sensHeight = 40.;
 549      const Float_t sensWidth  = 0.5; // according to TDR fig 2.120
 550      const Int_t sensMaterial = idGas;
 551      const Float_t yOverlap   = 1.5;
 552
 553      // PCB dimensions in cm; width: 30 mum copper
 554      const Float_t pcbLength  = sensLength;
 555      const Float_t pcbHeight  = 60.;
 556      const Float_t pcbWidth   = 0.003;
 557      const Int_t pcbMaterial  = idCopper;
 558
 559      // Insulating material: 200 mum glass fiber glued to pcb
 560      const Float_t insuLength = pcbLength;
 561      const Float_t insuHeight = pcbHeight;
 562      const Float_t insuWidth  = 0.020;
 563      const Int_t insuMaterial = idGlass;
 564
 565      // Carbon fiber panels: 200mum carbon/epoxy skin
 566      const Float_t panelLength = sensLength;
 567      const Float_t panelHeight = sensHeight;
 568      const Float_t panelWidth  = 0.020;
 569      const Int_t panelMaterial = idCarbon;
 570
 571      // rohacell between the two carbon panels
 572      const Float_t rohaLength = sensLength;
 573      const Float_t rohaHeight = sensHeight;
 574      const Float_t rohaWidth  = 0.5;
 575      const Int_t rohaMaterial = idRoha;
 576
 577      // Frame around the slat: 2 sticks along length,2 along height
 578      // H: the horizontal ones
 579      const Float_t hFrameLength = pcbLength;
 580      const Float_t hFrameHeight = 1.5;
 581      const Float_t hFrameWidth  = sensWidth;
 582      const Int_t hFrameMaterial = idGlass;
 583
 584      // V: the vertical ones
 585      const Float_t vFrameLength = 4.0;
 586      const Float_t vFrameHeight = sensHeight + hFrameHeight;
 587      const Float_t vFrameWidth  = sensWidth;
 588      const Int_t vFrameMaterial = idGlass;
 589
 590      // B: the horizontal border filled with rohacell
 591      const Float_t bFrameLength = hFrameLength;
 592      const Float_t bFrameHeight = (pcbHeight - sensHeight)/2. - hFrameHeight;
 593      const Float_t bFrameWidth  = hFrameWidth;
 594      const Int_t bFrameMaterial = idRoha;
 595
 596      // NULOC: 30 mum copper + 200 mum vetronite (same radiation length as 14mum copper)
 597      const Float_t nulocLength = 2.5;
 598      const Float_t nulocHeight = 7.5;
 599      const Float_t nulocWidth  = 0.0030 + 0.0014; // equivalent copper width of vetronite;
 600      const Int_t   nulocMaterial = idCopper;
 601
 602      const Float_t slatHeight = pcbHeight;
 603      const Float_t slatWidth = sensWidth + 2.*(pcbWidth + insuWidth +
 604                                                2.* panelWidth + rohaWidth);
 605      const Int_t slatMaterial = idAir;
 606      const Float_t dSlatLength = vFrameLength; // border on left and right
 607
 608      Float_t spar[3];
 609      Int_t i, j;
 610
 611      // the panel volume contains the rohacell
 612
 613      Float_t twidth = 2 * panelWidth + rohaWidth;
 614      Float_t panelpar[3] = { panelLength/2., panelHeight/2., twidth/2. };
 615      Float_t rohapar[3] = { rohaLength/2., rohaHeight/2., rohaWidth/2. };
 616
 617      // insulating material contains PCB-> gas-> 2 borders filled with rohacell
 618
 619      twidth = 2*(insuWidth + pcbWidth) + sensWidth;
 620      Float_t insupar[3] = { insuLength/2., insuHeight/2., twidth/2. };
 621      twidth -= 2 * insuWidth;
 622      Float_t pcbpar[3] = { pcbLength/2., pcbHeight/2., twidth/2. };
 623      Float_t senspar[3] = { sensLength/2., sensHeight/2., sensWidth/2. };
 624      Float_t theight = 2*hFrameHeight + sensHeight;
 625      Float_t hFramepar[3]={hFrameLength/2., theight/2., hFrameWidth/2.};
 626      Float_t bFramepar[3]={bFrameLength/2., bFrameHeight/2., bFrameWidth/2.};
 627      Float_t vFramepar[3]={vFrameLength/2., vFrameHeight/2., vFrameWidth/2.};
 628      Float_t nulocpar[3]={nulocLength/2., nulocHeight/2., nulocWidth/2.};
 629      Float_t xx;
 630      Float_t xxmax = (bFrameLength - nulocLength)/2.;
 631      Int_t index=0;
 632
 633      if (stations[2]) {
 634
 635 //********************************************************************
 636 //                            Station 3                             **
 637 //********************************************************************
 638      // indices 1 and 2 for first and second chambers in the station
 639      // iChamber (first chamber) kept for other quanties than Z,
 640      // assumed to be the same in both chambers
 641      iChamber1 = iChamber = (AliMUONChamber*) (*fChambers)[4];
 642      iChamber2 =(AliMUONChamber*) (*fChambers)[5];
 643      zpos1=iChamber1->Z();
 644      zpos2=iChamber2->Z();
 645      dstation = zpos2 - zpos1;
 646
 647 //      zfpos=-(iChamber->DGas()+dframez+iChamber->DAlu())/2; // not used any more
 648 //
 649 //   Mother volume
 650      tpar[0] = iChamber->RInner()-dframep;
 651      tpar[1] = (iChamber->ROuter()+dframep)/TMath::Cos(phi);
 652      tpar[2] = dstation/4;
 653      gMC->Gsvolu("C05M", "TUBE", idAir, tpar, 3);
 654      gMC->Gsvolu("C06M", "TUBE", idAir, tpar, 3);
 655      gMC->Gspos("C05M", 1, "ALIC", 0., 0., zpos1 , 0, "ONLY");
 656      gMC->Gspos("C06M", 1, "ALIC", 0., 0., zpos2 , 0, "ONLY");
 657
 658      // volumes for slat geometry (xx=5,..,10 chamber id):
 659      // Sxx0 Sxx1 Sxx2 Sxx3  -->   Slat Mother volumes
 660      // SxxG                          -->   Sensitive volume (gas)
 661      // SxxP                          -->   PCB (copper)
 662      // SxxI                          -->   Insulator (vetronite)
 663      // SxxC                          -->   Carbon panel
 664      // SxxR                          -->   Rohacell
 665      // SxxH, SxxV                    -->   Horizontal and Vertical frames (vetronite)
 666
 667      // slat dimensions: slat is a MOTHER volume!!! made of air
 668
 669      const Int_t nSlats3 = 5;  // number of slats per quadrant
 670      const Int_t nPCB3[nSlats3] = {3,3,4,3,2}; // n PCB per slat
 671      const Float_t xpos3[nSlats3] = {30., 40., 0., 0., 0.};
 672      Float_t slatLength3[nSlats3];
 673
 674      // create and position the slat (mother) volumes
 675
 676      char volNam5[5];
 677      char volNam6[5];
 678      Float_t xSlat3;
 679
 680      for (i = 0; i<nSlats3; i++){
 681        slatLength3[i] = pcbLength * nPCB3[i] + 2. * dSlatLength;
 682        xSlat3 = slatLength3[i]/2. - vFrameLength/2. + xpos3[i];
 683        if (i==1) slatLength3[i] -=  2. *dSlatLength; // frame out in PCB with circular border
 684        Float_t ySlat31 =  sensHeight * i - yOverlap * i;
 685        Float_t ySlat32 = -sensHeight * i + yOverlap * i;
 686        spar[0] = slatLength3[i]/2.;
 687        spar[1] = slatHeight/2.;
 688        spar[2] = slatWidth/2. * 1.01;
 689        Float_t dzCh3=spar[2] * 1.01;
 690        // zSlat to be checked (odd downstream or upstream?)
 691        Float_t zSlat = (i%2 ==0)? -spar[2] : spar[2];
 692        sprintf(volNam5,"S05%d",i);
 693        gMC->Gsvolu(volNam5,"BOX",slatMaterial,spar,3);
 694        gMC->Gspos(volNam5, i*4+1,"C05M", xSlat3, ySlat31, zSlat+2.*dzCh3, 0, "ONLY");
 695        gMC->Gspos(volNam5, i*4+2,"C05M",-xSlat3, ySlat31, zSlat-2.*dzCh3, 0, "ONLY");
 696        if (i>0) {
 697          gMC->Gspos(volNam5, i*4+3,"C05M", xSlat3, ySlat32, zSlat+2.*dzCh3, 0, "ONLY");
 698          gMC->Gspos(volNam5, i*4+4,"C05M",-xSlat3, ySlat32, zSlat-2.*dzCh3, 0, "ONLY");
 699        }
 700        sprintf(volNam6,"S06%d",i);
 701        gMC->Gsvolu(volNam6,"BOX",slatMaterial,spar,3);
 702        gMC->Gspos(volNam6, i*4+1,"C06M", xSlat3, ySlat31, zSlat+2.*dzCh3, 0, "ONLY");
 703        gMC->Gspos(volNam6, i*4+2,"C06M",-xSlat3, ySlat31, zSlat-2.*dzCh3, 0, "ONLY");
 704        if (i>0) {
 705          gMC->Gspos(volNam6, i*4+3,"C06M", xSlat3, ySlat32, zSlat+2.*dzCh3, 0, "ONLY");
 706          gMC->Gspos(volNam6, i*4+4,"C06M",-xSlat3, ySlat32, zSlat-2.*dzCh3, 0, "ONLY");
 707        }
 708      }
 709
 710      // create the panel volume
 711
 712      gMC->Gsvolu("S05C","BOX",panelMaterial,panelpar,3);
 713      gMC->Gsvolu("S06C","BOX",panelMaterial,panelpar,3);
 714
 715      // create the rohacell volume
 716
 717      gMC->Gsvolu("S05R","BOX",rohaMaterial,rohapar,3);
 718      gMC->Gsvolu("S06R","BOX",rohaMaterial,rohapar,3);
 719
 720      // create the insulating material volume
 721
 722      gMC->Gsvolu("S05I","BOX",insuMaterial,insupar,3);
 723      gMC->Gsvolu("S06I","BOX",insuMaterial,insupar,3);
 724
 725      // create the PCB volume
 726
 727      gMC->Gsvolu("S05P","BOX",pcbMaterial,pcbpar,3);
 728      gMC->Gsvolu("S06P","BOX",pcbMaterial,pcbpar,3);
 729
 730      // create the sensitive volumes,
 731      gMC->Gsvolu("S05G","BOX",sensMaterial,0,0);
 732      gMC->Gsvolu("S06G","BOX",sensMaterial,0,0);
 733
 734
 735      // create the vertical frame volume
 736
 737      gMC->Gsvolu("S05V","BOX",vFrameMaterial,vFramepar,3);
 738      gMC->Gsvolu("S06V","BOX",vFrameMaterial,vFramepar,3);
 739
 740      // create the horizontal frame volume
 741
 742      gMC->Gsvolu("S05H","BOX",hFrameMaterial,hFramepar,3);
 743      gMC->Gsvolu("S06H","BOX",hFrameMaterial,hFramepar,3);
 744
 745      // create the horizontal border volume
 746
 747      gMC->Gsvolu("S05B","BOX",bFrameMaterial,bFramepar,3);
 748      gMC->Gsvolu("S06B","BOX",bFrameMaterial,bFramepar,3);
 749
 750      index=0;
 751      for (i = 0; i<nSlats3; i++){
 752        sprintf(volNam5,"S05%d",i);
 753        sprintf(volNam6,"S06%d",i);
 754        Float_t xvFrame  = (slatLength3[i] - vFrameLength)/2.;
 755        // position the vertical frames
 756        if (i!=1) {
 757          gMC->Gspos("S05V",2*i-1,volNam5, xvFrame, 0., 0. , 0, "ONLY");
 758          gMC->Gspos("S05V",2*i  ,volNam5,-xvFrame, 0., 0. , 0, "ONLY");
 759          gMC->Gspos("S06V",2*i-1,volNam6, xvFrame, 0., 0. , 0, "ONLY");
 760          gMC->Gspos("S06V",2*i  ,volNam6,-xvFrame, 0., 0. , 0, "ONLY");
 761        }
 762        // position the panels and the insulating material
 763        for (j=0; j<nPCB3[i]; j++){
 764          index++;
 765          Float_t xx = sensLength * (-nPCB3[i]/2.+j+.5);
 766
 767          Float_t zPanel = spar[2] - panelpar[2];
 768          gMC->Gspos("S05C",2*index-1,volNam5, xx, 0., zPanel , 0, "ONLY");
 769          gMC->Gspos("S05C",2*index  ,volNam5, xx, 0.,-zPanel , 0, "ONLY");
 770          gMC->Gspos("S06C",2*index-1,volNam6, xx, 0., zPanel , 0, "ONLY");
 771          gMC->Gspos("S06C",2*index  ,volNam6, xx, 0.,-zPanel , 0, "ONLY");
 772
 773          gMC->Gspos("S05I",index,volNam5, xx, 0., 0 , 0, "ONLY");
 774          gMC->Gspos("S06I",index,volNam6, xx, 0., 0 , 0, "ONLY");
 775        }
 776      }
 777
 778      // position the rohacell volume inside the panel volume
 779      gMC->Gspos("S05R",1,"S05C",0.,0.,0.,0,"ONLY");
 780      gMC->Gspos("S06R",1,"S06C",0.,0.,0.,0,"ONLY");
 781
 782      // position the PCB volume inside the insulating material volume
 783      gMC->Gspos("S05P",1,"S05I",0.,0.,0.,0,"ONLY");
 784      gMC->Gspos("S06P",1,"S06I",0.,0.,0.,0,"ONLY");
 785      // position the horizontal frame volume inside the PCB volume
 786      gMC->Gspos("S05H",1,"S05P",0.,0.,0.,0,"ONLY");
 787      gMC->Gspos("S06H",1,"S06P",0.,0.,0.,0,"ONLY");
 788      // position the sensitive volume inside the horizontal frame volume
 789      gMC->Gsposp("S05G",1,"S05H",0.,0.,0.,0,"ONLY",senspar,3);
 790      gMC->Gsposp("S06G",1,"S06H",0.,0.,0.,0,"ONLY",senspar,3);
 791      // position the border volumes inside the PCB volume
 792      Float_t yborder = ( pcbHeight - bFrameHeight ) / 2.;
 793      gMC->Gspos("S05B",1,"S05P",0., yborder,0.,0,"ONLY");
 794      gMC->Gspos("S05B",2,"S05P",0.,-yborder,0.,0,"ONLY");
 795      gMC->Gspos("S06B",1,"S06P",0., yborder,0.,0,"ONLY");
 796      gMC->Gspos("S06B",2,"S06P",0.,-yborder,0.,0,"ONLY");
 797
 798      // create the NULOC volume and position it in the horizontal frame
 799
 800      gMC->Gsvolu("S05N","BOX",nulocMaterial,nulocpar,3);
 801      gMC->Gsvolu("S06N","BOX",nulocMaterial,nulocpar,3);
 802      index = 0;
 803      for (xx = -xxmax; xx<=xxmax; xx+=3*nulocLength) {
 804        index++;
 805        gMC->Gspos("S05N",2*index-1,"S05B", xx, 0.,-bFrameWidth/4., 0, "ONLY");
 806        gMC->Gspos("S05N",2*index  ,"S05B", xx, 0., bFrameWidth/4., 0, "ONLY");
 807        gMC->Gspos("S06N",2*index-1,"S06B", xx, 0.,-bFrameWidth/4., 0, "ONLY");
 808        gMC->Gspos("S06N",2*index  ,"S06B", xx, 0., bFrameWidth/4., 0, "ONLY");
 809      }
 810
 811      // position the volumes approximating the circular section of the pipe
 812      Float_t yoffs = sensHeight/2. - yOverlap;
 813      Float_t epsilon = 0.001;
 814      Int_t ndiv=6;
 815      Float_t divpar[3];
 816      Double_t dydiv= sensHeight/ndiv;
 817      Double_t ydiv = yoffs -dydiv - yOverlap/2.;
 818      Int_t imax=0;
 819      //     for (Int_t islat=0; islat<nSlats3; islat++) imax += nPCB3[islat];
 820      imax = 1;
 821      Float_t rmin = 35.;
 822      Float_t z1 = spar[2], z2=2*spar[2]*1.01;
 823      for (Int_t idiv=0;idiv<ndiv; idiv++){
 824        ydiv+= dydiv;
 825        Float_t xdiv = 0.;
 826        if (ydiv<rmin) xdiv= rmin * TMath::Sin( TMath::ACos(ydiv/rmin) );
 827        divpar[0] = (pcbLength-xdiv)/2.;
 828        divpar[1] = dydiv/2. - epsilon;
 829        divpar[2] = sensWidth/2.;
 830        Float_t xvol=(pcbLength+xdiv)/2.+1.999;
 831        Float_t yvol=ydiv + dydiv/2.;
 832        gMC->Gsposp("S05G",imax+4*idiv+1,"C05M", xvol, yvol, z1+z2, 0, "ONLY",divpar,3);
 833        gMC->Gsposp("S06G",imax+4*idiv+1,"C06M", xvol, yvol, z1+z2, 0, "ONLY",divpar,3);
 834        gMC->Gsposp("S05G",imax+4*idiv+2,"C05M", xvol,-yvol, z1+z2, 0, "ONLY",divpar,3);
 835        gMC->Gsposp("S06G",imax+4*idiv+2,"C06M", xvol,-yvol, z1+z2, 0, "ONLY",divpar,3);
 836        gMC->Gsposp("S05G",imax+4*idiv+3,"C05M",-xvol, yvol, z1-z2, 0, "ONLY",divpar,3);
 837        gMC->Gsposp("S06G",imax+4*idiv+3,"C06M",-xvol, yvol, z1-z2, 0, "ONLY",divpar,3);
 838        gMC->Gsposp("S05G",imax+4*idiv+4,"C05M",-xvol,-yvol, z1-z2, 0, "ONLY",divpar,3);
 839        gMC->Gsposp("S06G",imax+4*idiv+4,"C06M",-xvol,-yvol, z1-z2, 0, "ONLY",divpar,3);
 840      }
 841      }
 842
 843
 844  if (stations[3]) {
 845
 846 //********************************************************************
 847 //                            Station 4                             **
 848 //********************************************************************
 849      // indices 1 and 2 for first and second chambers in the station
 850      // iChamber (first chamber) kept for other quanties than Z,
 851      // assumed to be the same in both chambers
 852      iChamber1 = iChamber = (AliMUONChamber*) (*fChambers)[6];
 853      iChamber2 =(AliMUONChamber*) (*fChambers)[7];
 854      zpos1=iChamber1->Z();
 855      zpos2=iChamber2->Z();
 856      dstation = zpos2 - zpos1;
 857 //      zfpos=-(iChamber->DGas()+dframez+iChamber->DAlu())/2; // not used any more
 858
 859 //
 860 //   Mother volume
 861      tpar[0] = iChamber->RInner()-dframep;
 862      tpar[1] = (iChamber->ROuter()+dframep)/TMath::Cos(phi);
 863      tpar[2] = 3.252;
 864
 865      gMC->Gsvolu("C07M", "TUBE", idAir, tpar, 3);
 866      gMC->Gsvolu("C08M", "TUBE", idAir, tpar, 3);
 867      gMC->Gspos("C07M", 1, "ALIC", 0., 0., zpos1 , 0, "ONLY");
 868      gMC->Gspos("C08M", 1, "ALIC", 0., 0., zpos2 , 0, "ONLY");
 869
 870
 871      const Int_t nSlats4 = 6;  // number of slats per quadrant
 872      const Int_t nPCB4[nSlats4] = {4,4,5,5,4,3}; // n PCB per slat
 873      const Float_t xpos4[nSlats4] = {37.5, 40., 0., 0., 0., 0.};
 874      Float_t slatLength4[nSlats4];
 875
 876      // create and position the slat (mother) volumes
 877
 878      char volNam7[5];
 879      char volNam8[5];
 880      Float_t xSlat4;
 881      Float_t ySlat4;
 882
 883      for (i = 0; i<nSlats4; i++){
 884        slatLength4[i] = pcbLength * nPCB4[i] + 2. * dSlatLength;
 885        xSlat4 = slatLength4[i]/2. - vFrameLength/2. + xpos4[i];
 886        if (i==1) slatLength4[i] -=  2. *dSlatLength; // frame out in PCB with circular border
 887        ySlat4 =  sensHeight * i - yOverlap *i;
 888
 889        spar[0] = slatLength4[i]/2.;
 890        spar[1] = slatHeight/2.;
 891        spar[2] = slatWidth/2.*1.01;
 892        Float_t dzCh4=spar[2]*1.01;
 893        // zSlat to be checked (odd downstream or upstream?)
 894        Float_t zSlat = (i%2 ==0)? spar[2] : -spar[2];
 895        sprintf(volNam7,"S07%d",i);
 896        gMC->Gsvolu(volNam7,"BOX",slatMaterial,spar,3);
 897        gMC->Gspos(volNam7, i*4+1,"C07M", xSlat4, ySlat4, zSlat+2.*dzCh4, 0, "ONLY");
 898        gMC->Gspos(volNam7, i*4+2,"C07M",-xSlat4, ySlat4, zSlat-2.*dzCh4, 0, "ONLY");
 899        if (i>0) {
 900          gMC->Gspos(volNam7, i*4+3,"C07M", xSlat4,-ySlat4, zSlat+2.*dzCh4, 0, "ONLY");
 901          gMC->Gspos(volNam7, i*4+4,"C07M",-xSlat4,-ySlat4, zSlat-2.*dzCh4, 0, "ONLY");
 902        }
 903        sprintf(volNam8,"S08%d",i);
 904        gMC->Gsvolu(volNam8,"BOX",slatMaterial,spar,3);
 905        gMC->Gspos(volNam8, i*4+1,"C08M", xSlat4, ySlat4, zSlat+2.*dzCh4, 0, "ONLY");
 906        gMC->Gspos(volNam8, i*4+2,"C08M",-xSlat4, ySlat4, zSlat-2.*dzCh4, 0, "ONLY");
 907        if (i>0) {
 908          gMC->Gspos(volNam8, i*4+3,"C08M", xSlat4,-ySlat4, zSlat+2.*dzCh4, 0, "ONLY");
 909          gMC->Gspos(volNam8, i*4+4,"C08M",-xSlat4,-ySlat4, zSlat-2.*dzCh4, 0, "ONLY");
 910        }
 911      }
 912
 913
 914      // create the panel volume
 915
 916      gMC->Gsvolu("S07C","BOX",panelMaterial,panelpar,3);
 917      gMC->Gsvolu("S08C","BOX",panelMaterial,panelpar,3);
 918
 919      // create the rohacell volume
 920
 921      gMC->Gsvolu("S07R","BOX",rohaMaterial,rohapar,3);
 922      gMC->Gsvolu("S08R","BOX",rohaMaterial,rohapar,3);
 923
 924      // create the insulating material volume
 925
 926      gMC->Gsvolu("S07I","BOX",insuMaterial,insupar,3);
 927      gMC->Gsvolu("S08I","BOX",insuMaterial,insupar,3);
 928
 929      // create the PCB volume
 930
 931      gMC->Gsvolu("S07P","BOX",pcbMaterial,pcbpar,3);
 932      gMC->Gsvolu("S08P","BOX",pcbMaterial,pcbpar,3);
 933
 934      // create the sensitive volumes,
 935
 936      gMC->Gsvolu("S07G","BOX",sensMaterial,0,0);
 937      gMC->Gsvolu("S08G","BOX",sensMaterial,0,0);
 938
 939      // create the vertical frame volume
 940
 941      gMC->Gsvolu("S07V","BOX",vFrameMaterial,vFramepar,3);
 942      gMC->Gsvolu("S08V","BOX",vFrameMaterial,vFramepar,3);
 943
 944      // create the horizontal frame volume
 945
 946      gMC->Gsvolu("S07H","BOX",hFrameMaterial,hFramepar,3);
 947      gMC->Gsvolu("S08H","BOX",hFrameMaterial,hFramepar,3);
 948
 949      // create the horizontal border volume
 950
 951      gMC->Gsvolu("S07B","BOX",bFrameMaterial,bFramepar,3);
 952      gMC->Gsvolu("S08B","BOX",bFrameMaterial,bFramepar,3);
 953
 954      index=0;
 955      for (i = 0; i<nSlats4; i++){
 956        sprintf(volNam7,"S07%d",i);
 957        sprintf(volNam8,"S08%d",i);
 958        Float_t xvFrame  = (slatLength4[i] - vFrameLength)/2.;
 959        // position the vertical frames
 960        if (i!=1) {
 961          gMC->Gspos("S07V",2*i-1,volNam7, xvFrame, 0., 0. , 0, "ONLY");
 962          gMC->Gspos("S07V",2*i  ,volNam7,-xvFrame, 0., 0. , 0, "ONLY");
 963          gMC->Gspos("S08V",2*i-1,volNam8, xvFrame, 0., 0. , 0, "ONLY");
 964          gMC->Gspos("S08V",2*i  ,volNam8,-xvFrame, 0., 0. , 0, "ONLY");
 965        }
 966        // position the panels and the insulating material
 967        for (j=0; j<nPCB4[i]; j++){
 968          index++;
 969          Float_t xx = sensLength * (-nPCB4[i]/2.+j+.5);
 970
 971          Float_t zPanel = spar[2] - panelpar[2];
 972          gMC->Gspos("S07C",2*index-1,volNam7, xx, 0., zPanel , 0, "ONLY");
 973          gMC->Gspos("S07C",2*index  ,volNam7, xx, 0.,-zPanel , 0, "ONLY");
 974          gMC->Gspos("S08C",2*index-1,volNam8, xx, 0., zPanel , 0, "ONLY");
 975          gMC->Gspos("S08C",2*index  ,volNam8, xx, 0.,-zPanel , 0, "ONLY");
 976
 977          gMC->Gspos("S07I",index,volNam7, xx, 0., 0 , 0, "ONLY");
 978          gMC->Gspos("S08I",index,volNam8, xx, 0., 0 , 0, "ONLY");
 979        }
 980      }
 981
 982      // position the rohacell volume inside the panel volume
 983      gMC->Gspos("S07R",1,"S07C",0.,0.,0.,0,"ONLY");
 984      gMC->Gspos("S08R",1,"S08C",0.,0.,0.,0,"ONLY");
 985
 986      // position the PCB volume inside the insulating material volume
 987      gMC->Gspos("S07P",1,"S07I",0.,0.,0.,0,"ONLY");
 988      gMC->Gspos("S08P",1,"S08I",0.,0.,0.,0,"ONLY");
 989      // position the horizontal frame volume inside the PCB volume
 990      gMC->Gspos("S07H",1,"S07P",0.,0.,0.,0,"ONLY");
 991      gMC->Gspos("S08H",1,"S08P",0.,0.,0.,0,"ONLY");
 992      // position the sensitive volume inside the horizontal frame volume
 993      gMC->Gsposp("S07G",1,"S07H",0.,0.,0.,0,"ONLY",senspar,3);
 994      gMC->Gsposp("S08G",1,"S08H",0.,0.,0.,0,"ONLY",senspar,3);
 995      // position the border volumes inside the PCB volume
 996      Float_t yborder = ( pcbHeight - bFrameHeight ) / 2.;
 997      gMC->Gspos("S07B",1,"S07P",0., yborder,0.,0,"ONLY");
 998      gMC->Gspos("S07B",2,"S07P",0.,-yborder,0.,0,"ONLY");
 999      gMC->Gspos("S08B",1,"S08P",0., yborder,0.,0,"ONLY");
1000      gMC->Gspos("S08B",2,"S08P",0.,-yborder,0.,0,"ONLY");
1001
1002      // create the NULOC volume and position it in the horizontal frame
1003
1004      gMC->Gsvolu("S07N","BOX",nulocMaterial,nulocpar,3);
1005      gMC->Gsvolu("S08N","BOX",nulocMaterial,nulocpar,3);
1006      index = 0;
1007      for (xx = -xxmax; xx<=xxmax; xx+=3*nulocLength) {
1008        index++;
1009        gMC->Gspos("S07N",2*index-1,"S07B", xx, 0.,-bFrameWidth/4., 0, "ONLY");
1010        gMC->Gspos("S07N",2*index  ,"S07B", xx, 0., bFrameWidth/4., 0, "ONLY");
1011        gMC->Gspos("S08N",2*index-1,"S08B", xx, 0.,-bFrameWidth/4., 0, "ONLY");
1012        gMC->Gspos("S08N",2*index  ,"S08B", xx, 0., bFrameWidth/4., 0, "ONLY");
1013      }
1014
1015      // position the volumes approximating the circular section of the pipe
1016      Float_t yoffs = sensHeight/2. - yOverlap/2.;
1017      Float_t epsilon = 0.001;
1018      Int_t ndiv=6;
1019      Float_t divpar[3];
1020      Double_t dydiv= sensHeight/ndiv;
1021      Double_t ydiv = yoffs -dydiv - yOverlap/2.;
1022      Int_t imax=0;
1023      //     for (Int_t islat=0; islat<nSlats3; islat++) imax += nPCB3[islat];
1024      imax = 1;
1025      Float_t rmin = 40.;
1026      Float_t z1 = -spar[2], z2=2*spar[2]*1.01;
1027      for (Int_t idiv=0;idiv<ndiv; idiv++){
1028        ydiv+= dydiv;
1029        Float_t xdiv = 0.;
1030        if (ydiv<rmin) xdiv= rmin * TMath::Sin( TMath::ACos(ydiv/rmin) );
1031        divpar[0] = (pcbLength-xdiv)/2.;
1032        divpar[1] = dydiv/2. - epsilon;
1033        divpar[2] = sensWidth/2.;
1034        Float_t xvol=(pcbLength+xdiv)/2.+1.999;
1035        Float_t yvol=ydiv + dydiv/2.;
1036        gMC->Gsposp("S07G",imax+4*idiv+1,"C07M", xvol, yvol, z1+z2, 0, "ONLY",divpar,3);
1037        gMC->Gsposp("S08G",imax+4*idiv+1,"C08M", xvol, yvol, z1+z2, 0, "ONLY",divpar,3);
1038        gMC->Gsposp("S07G",imax+4*idiv+2,"C07M", xvol,-yvol, z1+z2, 0, "ONLY",divpar,3);
1039        gMC->Gsposp("S08G",imax+4*idiv+2,"C08M", xvol,-yvol, z1+z2, 0, "ONLY",divpar,3);
1040        gMC->Gsposp("S07G",imax+4*idiv+3,"C07M",-xvol, yvol, z1-z2, 0, "ONLY",divpar,3);
1041        gMC->Gsposp("S08G",imax+4*idiv+3,"C08M",-xvol, yvol, z1-z2, 0, "ONLY",divpar,3);
1042        gMC->Gsposp("S07G",imax+4*idiv+4,"C07M",-xvol,-yvol, z1-z2, 0, "ONLY",divpar,3);
1043        gMC->Gsposp("S08G",imax+4*idiv+4,"C08M",-xvol,-yvol, z1-z2, 0, "ONLY",divpar,3);
1044      }
1045
1046
1047
1048
1049
1050  }
1051
1052  if (stations[4]) {
1053
1054
1055 //********************************************************************
1056 //                            Station 5                             **
1057 //********************************************************************
1058      // indices 1 and 2 for first and second chambers in the station
1059      // iChamber (first chamber) kept for other quanties than Z,
1060      // assumed to be the same in both chambers
1061      iChamber1 = iChamber = (AliMUONChamber*) (*fChambers)[8];
1062      iChamber2 =(AliMUONChamber*) (*fChambers)[9];
1063      zpos1=iChamber1->Z();
1064      zpos2=iChamber2->Z();
1065      dstation = zpos2 - zpos1;
1066 //      zfpos=-(iChamber->DGas()+dframez+iChamber->DAlu())/2; // not used any more
1067
1068 //
1069 //   Mother volume
1070      tpar[0] = iChamber->RInner()-dframep;
1071      tpar[1] = (iChamber->ROuter()+dframep)/TMath::Cos(phi);
1072      tpar[2] = dstation/5.;
1073
1074      gMC->Gsvolu("C09M", "TUBE", idAir, tpar, 3);
1075      gMC->Gsvolu("C10M", "TUBE", idAir, tpar, 3);
1076      gMC->Gspos("C09M", 1, "ALIC", 0., 0., zpos1 , 0, "ONLY");
1077      gMC->Gspos("C10M", 1, "ALIC", 0., 0., zpos2 , 0, "ONLY");
1078
1079
1080      const Int_t nSlats5 = 7;  // number of slats per quadrant
1081      const Int_t nPCB5[nSlats5] = {5,5,6,6,5,4,3}; // n PCB per slat
1082      const Float_t xpos5[nSlats5] = {37.5, 40., 0., 0., 0., 0., 0.};
1083      Float_t slatLength5[nSlats5];
1084      char volNam9[5];
1085      char volNam10[5];
1086      Float_t xSlat5;
1087      Float_t ySlat5;
1088
1089      for (i = 0; i<nSlats5; i++){
1090        slatLength5[i] = pcbLength * nPCB5[i] + 2. * dSlatLength;
1091        xSlat5 = slatLength5[i]/2. - vFrameLength/2. +xpos5[i];
1092        if (i==1) slatLength5[i] -=  2. *dSlatLength; // frame out in PCB with circular border
1093        ySlat5 = sensHeight * i - yOverlap * i;
1094        spar[0] = slatLength5[i]/2.;
1095        spar[1] = slatHeight/2.;
1096        spar[2] = slatWidth/2. * 1.01;
1097        Float_t dzCh5=spar[2]*1.01;
1098        // zSlat to be checked (odd downstream or upstream?)
1099        Float_t zSlat = (i%2 ==0)? -spar[2] : spar[2];
1100        sprintf(volNam9,"S09%d",i);
1101        gMC->Gsvolu(volNam9,"BOX",slatMaterial,spar,3);
1102        gMC->Gspos(volNam9, i*4+1,"C09M", xSlat5, ySlat5, zSlat+2.*dzCh5, 0, "ONLY");
1103        gMC->Gspos(volNam9, i*4+2,"C09M",-xSlat5, ySlat5, zSlat-2.*dzCh5, 0, "ONLY");
1104        if (i>0) {
1105            gMC->Gspos(volNam9, i*4+3,"C09M", xSlat5,-ySlat5, zSlat+2.*dzCh5, 0, "ONLY");
1106            gMC->Gspos(volNam9, i*4+4,"C09M",-xSlat5,-ySlat5, zSlat-2.*dzCh5, 0, "ONLY");
1107        }
1108        sprintf(volNam10,"S10%d",i);
1109        gMC->Gsvolu(volNam10,"BOX",slatMaterial,spar,3);
1110        gMC->Gspos(volNam10, i*4+1,"C10M", xSlat5, ySlat5, zSlat+2.*dzCh5, 0, "ONLY");
1111        gMC->Gspos(volNam10, i*4+2,"C10M",-xSlat5, ySlat5, zSlat-2.*dzCh5, 0, "ONLY");
1112        if (i>0) {
1113            gMC->Gspos(volNam10, i*4+3,"C10M", xSlat5,-ySlat5, zSlat+2.*dzCh5, 0, "ONLY");
1114            gMC->Gspos(volNam10, i*4+4,"C10M",-xSlat5,-ySlat5, zSlat-2.*dzCh5, 0, "ONLY");
1115        }
1116      }
1117
1118      // create the panel volume
1119
1120      gMC->Gsvolu("S09C","BOX",panelMaterial,panelpar,3);
1121      gMC->Gsvolu("S10C","BOX",panelMaterial,panelpar,3);
1122
1123      // create the rohacell volume
1124
1125      gMC->Gsvolu("S09R","BOX",rohaMaterial,rohapar,3);
1126      gMC->Gsvolu("S10R","BOX",rohaMaterial,rohapar,3);
1127
1128      // create the insulating material volume
1129
1130      gMC->Gsvolu("S09I","BOX",insuMaterial,insupar,3);
1131      gMC->Gsvolu("S10I","BOX",insuMaterial,insupar,3);
1132
1133      // create the PCB volume
1134
1135      gMC->Gsvolu("S09P","BOX",pcbMaterial,pcbpar,3);
1136      gMC->Gsvolu("S10P","BOX",pcbMaterial,pcbpar,3);
1137
1138      // create the sensitive volumes,
1139
1140      gMC->Gsvolu("S09G","BOX",sensMaterial,0,0);
1141      gMC->Gsvolu("S10G","BOX",sensMaterial,0,0);
1142
1143      // create the vertical frame volume
1144
1145      gMC->Gsvolu("S09V","BOX",vFrameMaterial,vFramepar,3);
1146      gMC->Gsvolu("S10V","BOX",vFrameMaterial,vFramepar,3);
1147
1148      // create the horizontal frame volume
1149
1150      gMC->Gsvolu("S09H","BOX",hFrameMaterial,hFramepar,3);
1151      gMC->Gsvolu("S10H","BOX",hFrameMaterial,hFramepar,3);
1152
1153      // create the horizontal border volume
1154
1155      gMC->Gsvolu("S09B","BOX",bFrameMaterial,bFramepar,3);
1156      gMC->Gsvolu("S10B","BOX",bFrameMaterial,bFramepar,3);
1157
1158      index=0;
1159      for (i = 0; i<nSlats5; i++){
1160        sprintf(volNam9,"S09%d",i);
1161        sprintf(volNam10,"S10%d",i);
1162        Float_t xvFrame  = (slatLength5[i] - vFrameLength)/2.;
1163        // position the vertical frames
1164        if (i!=1) {
1165          gMC->Gspos("S09V",2*i-1,volNam9, xvFrame, 0., 0. , 0, "ONLY");
1166          gMC->Gspos("S09V",2*i  ,volNam9,-xvFrame, 0., 0. , 0, "ONLY");
1167          gMC->Gspos("S10V",2*i-1,volNam10, xvFrame, 0., 0. , 0, "ONLY");
1168          gMC->Gspos("S10V",2*i  ,volNam10,-xvFrame, 0., 0. , 0, "ONLY");
1169        }
1170
1171        // position the panels and the insulating material
1172        for (j=0; j<nPCB5[i]; j++){
1173          index++;
1174          Float_t xx = sensLength * (-nPCB5[i]/2.+j+.5);
1175
1176          Float_t zPanel = spar[2] - panelpar[2];
1177          gMC->Gspos("S09C",2*index-1,volNam9, xx, 0., zPanel , 0, "ONLY");
1178          gMC->Gspos("S09C",2*index  ,volNam9, xx, 0.,-zPanel , 0, "ONLY");
1179          gMC->Gspos("S10C",2*index-1,volNam10, xx, 0., zPanel , 0, "ONLY");
1180          gMC->Gspos("S10C",2*index  ,volNam10, xx, 0.,-zPanel , 0, "ONLY");
1181
1182          gMC->Gspos("S09I",index,volNam9, xx, 0., 0 , 0, "ONLY");
1183          gMC->Gspos("S10I",index,volNam10, xx, 0., 0 , 0, "ONLY");
1184        }
1185      }
1186
1187      // position the rohacell volume inside the panel volume
1188      gMC->Gspos("S09R",1,"S09C",0.,0.,0.,0,"ONLY");
1189      gMC->Gspos("S10R",1,"S10C",0.,0.,0.,0,"ONLY");
1190
1191      // position the PCB volume inside the insulating material volume
1192      gMC->Gspos("S09P",1,"S09I",0.,0.,0.,0,"ONLY");
1193      gMC->Gspos("S10P",1,"S10I",0.,0.,0.,0,"ONLY");
1194      // position the horizontal frame volume inside the PCB volume
1195      gMC->Gspos("S09H",1,"S09P",0.,0.,0.,0,"ONLY");
1196      gMC->Gspos("S10H",1,"S10P",0.,0.,0.,0,"ONLY");
1197      // position the sensitive volume inside the horizontal frame volume
1198      gMC->Gsposp("S09G",1,"S09H",0.,0.,0.,0,"ONLY",senspar,3);
1199      gMC->Gsposp("S10G",1,"S10H",0.,0.,0.,0,"ONLY",senspar,3);
1200      // position the border volumes inside the PCB volume
1201      Float_t yborder = ( pcbHeight - bFrameHeight ) / 2.;
1202      gMC->Gspos("S09B",1,"S09P",0., yborder,0.,0,"ONLY");
1203      gMC->Gspos("S09B",2,"S09P",0.,-yborder,0.,0,"ONLY");
1204      gMC->Gspos("S10B",1,"S10P",0., yborder,0.,0,"ONLY");
1205      gMC->Gspos("S10B",2,"S10P",0.,-yborder,0.,0,"ONLY");
1206
1207      // create the NULOC volume and position it in the horizontal frame
1208
1209      gMC->Gsvolu("S09N","BOX",nulocMaterial,nulocpar,3);
1210      gMC->Gsvolu("S10N","BOX",nulocMaterial,nulocpar,3);
1211      index = 0;
1212      for (xx = -xxmax; xx<=xxmax; xx+=3*nulocLength) {
1213        index++;
1214        gMC->Gspos("S09N",2*index-1,"S09B", xx, 0.,-bFrameWidth/4., 0, "ONLY");
1215        gMC->Gspos("S09N",2*index  ,"S09B", xx, 0., bFrameWidth/4., 0, "ONLY");
1216        gMC->Gspos("S10N",2*index-1,"S10B", xx, 0.,-bFrameWidth/4., 0, "ONLY");
1217        gMC->Gspos("S10N",2*index  ,"S10B", xx, 0., bFrameWidth/4., 0, "ONLY");
1218      }
1219      // position the volumes approximating the circular section of the pipe
1220      Float_t yoffs = sensHeight/2. - yOverlap/2.;
1221      Float_t epsilon = 0.001;
1222      Int_t ndiv=6;
1223      Float_t divpar[3];
1224      Double_t dydiv= sensHeight/ndiv;
1225      Double_t ydiv = yoffs -dydiv - yOverlap/2.;
1226      Int_t imax=0;
1227      //     for (Int_t islat=0; islat<nSlats3; islat++) imax += nPCB3[islat];
1228      imax = 1;
1229      Float_t rmin = 40.;
1230      Float_t z1 = spar[2], z2=2*spar[2]*1.01;
1231      for (Int_t idiv=0;idiv<ndiv; idiv++){
1232        ydiv+= dydiv;
1233        Float_t xdiv = 0.;
1234        if (ydiv<rmin) xdiv= rmin * TMath::Sin( TMath::ACos(ydiv/rmin) );
1235        divpar[0] = (pcbLength-xdiv)/2.;
1236        divpar[1] = dydiv/2. - epsilon;
1237        divpar[2] = sensWidth/2.;
1238        Float_t xvol=(pcbLength+xdiv)/2. + 1.999;
1239        Float_t yvol=ydiv + dydiv/2.;
1240        gMC->Gsposp("S09G",imax+4*idiv+1,"C09M", xvol, yvol, z1+z2, 0, "ONLY",divpar,3);
1241        gMC->Gsposp("S10G",imax+4*idiv+1,"C10M", xvol, yvol, z1+z2, 0, "ONLY",divpar,3);
1242        gMC->Gsposp("S09G",imax+4*idiv+2,"C09M", xvol,-yvol, z1+z2, 0, "ONLY",divpar,3);
1243        gMC->Gsposp("S10G",imax+4*idiv+2,"C10M", xvol,-yvol, z1+z2, 0, "ONLY",divpar,3);
1244        gMC->Gsposp("S09G",imax+4*idiv+3,"C09M",-xvol, yvol, z1-z2, 0, "ONLY",divpar,3);
1245        gMC->Gsposp("S10G",imax+4*idiv+3,"C10M",-xvol, yvol, z1-z2, 0, "ONLY",divpar,3);
1246        gMC->Gsposp("S09G",imax+4*idiv+4,"C09M",-xvol,-yvol, z1-z2, 0, "ONLY",divpar,3);
1247        gMC->Gsposp("S10G",imax+4*idiv+4,"C10M",-xvol,-yvol, z1-z2, 0, "ONLY",divpar,3);
1248      }
1249
1250  }
1251
1252
1253 ///////////////////////////////////////
1254 // GEOMETRY FOR THE TRIGGER CHAMBERS //
1255 ///////////////////////////////////////
1256
1257 // 03/00 P. Dupieux : introduce a slighly more realistic
1258 //                    geom. of the trigger readout planes with
1259 //                    2 Zpos per trigger plane (alternate
1260 //                    between left and right of the trigger)
1261
1262 //  Parameters of the Trigger Chambers
1263
1264 // DP03-01 introduce dead zone of +/- 2 cm arround x=0 (as in TDR, fig3.27)
1265      const Float_t kDXZERO=2.;
1266      const Float_t kXMC1MIN=34.;
1267      const Float_t kXMC1MED=51.;
1268      const Float_t kXMC1MAX=272.;
1269      const Float_t kYMC1MIN=34.;
1270      const Float_t kYMC1MAX=51.;
1271      const Float_t kRMIN1=50.;
1272 // DP03-01     const Float_t kRMAX1=62.;
1273      const Float_t kRMAX1=64.;
1274      const Float_t kRMIN2=50.;
1275 // DP03-01      const Float_t kRMAX2=66.;
1276      const Float_t kRMAX2=68.;
1277
1278 //   zposition of the middle of the gas gap in mother vol
1279      const Float_t kZMCm=-3.6;
1280      const Float_t kZMCp=+3.6;
1281
1282
1283 // TRIGGER STATION 1 - TRIGGER STATION 1 - TRIGGER STATION 1
1284
1285      // iChamber 1 and 2 for first and second chambers in the station
1286      // iChamber (first chamber) kept for other quanties than Z,
1287      // assumed to be the same in both chambers
1288      iChamber1 = iChamber = (AliMUONChamber*) (*fChambers)[10];
1289      iChamber2 =(AliMUONChamber*) (*fChambers)[11];
1290
1291      // 03/00
1292      // zpos1 and zpos2 are now the middle of the first and second
1293      // plane of station 1 :
1294      // zpos1=(16075+15995)/2=16035 mm, thick/2=40 mm
1295      // zpos2=(16225+16145)/2=16185 mm, thick/2=40 mm
1296      //
1297      // zpos1m=15999 mm , zpos1p=16071 mm (middles of gas gaps)
1298      // zpos2m=16149 mm , zpos2p=16221 mm (middles of gas gaps)
1299      // rem : the total thickness accounts for 1 mm of al on both
1300      // side of the RPCs (see zpos1 and zpos2), as previously
1301
1302      zpos1=iChamber1->Z();
1303      zpos2=iChamber2->Z();
1304
1305
1306 // Mother volume definition
1307      tpar[0] = iChamber->RInner();
1308      tpar[1] = iChamber->ROuter();
1309      tpar[2] = 4.0;
1310      gMC->Gsvolu("CM11", "TUBE", idAir, tpar, 3);
1311      gMC->Gsvolu("CM12", "TUBE", idAir, tpar, 3);
1312
1313 // Definition of the flange between the beam shielding and the RPC
1314      tpar[0]= kRMIN1;
1315      tpar[1]= kRMAX1;
1316      tpar[2]= 4.0;
1317
1318      gMC->Gsvolu("CF1A", "TUBE", idAlu1, tpar, 3);     //Al
1319      gMC->Gspos("CF1A", 1, "CM11", 0., 0., 0., 0, "MANY");
1320      gMC->Gspos("CF1A", 2, "CM12", 0., 0., 0., 0, "MANY");
1321
1322
1323 // FIRST PLANE OF STATION 1
1324
1325 //   ratios of zpos1m/zpos1p and inverse for first plane
1326      Float_t zmp=(zpos1-3.6)/(zpos1+3.6);
1327      Float_t zpm=1./zmp;
1328
1329
1330 // Definition of prototype for chambers in the first plane
1331
1332      tpar[0]= 0.;
1333      tpar[1]= 0.;
1334      tpar[2]= 0.;
1335
1336      gMC->Gsvolu("CC1A", "BOX ", idAlu1, tpar, 0);           //Al
1337      gMC->Gsvolu("CB1A", "BOX ", idtmed[1107], tpar, 0);     //Bakelite
1338      gMC->Gsvolu("CG1A", "BOX ", idtmed[1106], tpar, 0);     //Gas streamer
1339
1340 // chamber type A
1341      tpar[0] = -1.;
1342      tpar[1] = -1.;
1343
1344 // DP03-01     const Float_t kXMC1A=kXMC1MED+(kXMC1MAX-kXMC1MED)/2.;
1345      const Float_t kXMC1A=kDXZERO+kXMC1MED+(kXMC1MAX-kXMC1MED)/2.;
1346      const Float_t kYMC1Am=0.;
1347      const Float_t kYMC1Ap=0.;
1348
1349      tpar[2] = 0.1;
1350      gMC->Gsposp("CG1A", 1, "CB1A", 0., 0., 0., 0, "ONLY",tpar,3);
1351      tpar[2] = 0.3;
1352      gMC->Gsposp("CB1A", 1, "CC1A", 0., 0., 0., 0, "ONLY",tpar,3);
1353
1354      tpar[2] = 0.4;
1355      tpar[0] = (kXMC1MAX-kXMC1MED)/2.;
1356      tpar[1] = kYMC1MIN;
1357
1358      gMC->Gsposp("CC1A", 1, "CM11",kXMC1A,kYMC1Am,kZMCm, 0, "ONLY", tpar, 3);
1359      gMC->Gsposp("CC1A", 2, "CM11",-kXMC1A,kYMC1Ap,kZMCp, 0, "ONLY", tpar, 3);
1360
1361 //  chamber type B
1362      Float_t tpar1save=tpar[1];
1363      Float_t y1msave=kYMC1Am;
1364      Float_t y1psave=kYMC1Ap;
1365
1366      tpar[0] = (kXMC1MAX-kXMC1MIN)/2.;
1367      tpar[1] = (kYMC1MAX-kYMC1MIN)/2.;
1368
1369 // DP03-01     const Float_t kXMC1B=kXMC1MIN+tpar[0];
1370      const Float_t kXMC1B=kDXZERO+kXMC1MIN+tpar[0];
1371      const Float_t kYMC1Bp=(y1msave+tpar1save)*zpm+tpar[1];
1372      const Float_t kYMC1Bm=(y1psave+tpar1save)*zmp+tpar[1];
1373
1374      gMC->Gsposp("CC1A", 3, "CM11",kXMC1B,kYMC1Bp,kZMCp, 0, "ONLY", tpar, 3);
1375      gMC->Gsposp("CC1A", 4, "CM11",-kXMC1B,kYMC1Bm,kZMCm, 0, "ONLY", tpar, 3);
1376      gMC->Gsposp("CC1A", 5, "CM11",kXMC1B,-kYMC1Bp,kZMCp, 0, "ONLY", tpar, 3);
1377      gMC->Gsposp("CC1A", 6, "CM11",-kXMC1B,-kYMC1Bm,kZMCm, 0, "ONLY", tpar, 3);
1378
1379 //  chamber type C  (end of type B !!)
1380      tpar1save=tpar[1];
1381      y1msave=kYMC1Bm;
1382      y1psave=kYMC1Bp;
1383
1384      tpar[0] = kXMC1MAX/2;
1385      tpar[1] = kYMC1MAX/2;
1386
1387
1388 // DP03-01     const Float_t kXMC1C=tpar[0];
1389      const Float_t kXMC1C=kDXZERO+tpar[0];
1390 // warning : same Z than type B
1391      const Float_t kYMC1Cp=(y1psave+tpar1save)*1.+tpar[1];
1392      const Float_t kYMC1Cm=(y1msave+tpar1save)*1.+tpar[1];
1393
1394      gMC->Gsposp("CC1A", 7, "CM11",kXMC1C,kYMC1Cp,kZMCp, 0, "ONLY", tpar, 3);
1395      gMC->Gsposp("CC1A", 8, "CM11",-kXMC1C,kYMC1Cm,kZMCm, 0, "ONLY", tpar, 3);
1396      gMC->Gsposp("CC1A", 9, "CM11",kXMC1C,-kYMC1Cp,kZMCp, 0, "ONLY", tpar, 3);
1397      gMC->Gsposp("CC1A", 10, "CM11",-kXMC1C,-kYMC1Cm,kZMCm, 0, "ONLY", tpar, 3);
1398
1399 //  chamber type D, E and F (same size)
1400      tpar1save=tpar[1];
1401      y1msave=kYMC1Cm;
1402      y1psave=kYMC1Cp;
1403
1404      tpar[0] = kXMC1MAX/2.;
1405      tpar[1] = kYMC1MIN;
1406
1407 // DP03-01     const Float_t kXMC1D=tpar[0];
1408      const Float_t kXMC1D=kDXZERO+tpar[0];
1409      const Float_t kYMC1Dp=(y1msave+tpar1save)*zpm+tpar[1];
1410      const Float_t kYMC1Dm=(y1psave+tpar1save)*zmp+tpar[1];
1411
1412      gMC->Gsposp("CC1A", 11, "CM11",kXMC1D,kYMC1Dm,kZMCm, 0, "ONLY", tpar, 3);
1413      gMC->Gsposp("CC1A", 12, "CM11",-kXMC1D,kYMC1Dp,kZMCp, 0, "ONLY", tpar, 3);
1414      gMC->Gsposp("CC1A", 13, "CM11",kXMC1D,-kYMC1Dm,kZMCm, 0, "ONLY", tpar, 3);
1415      gMC->Gsposp("CC1A", 14, "CM11",-kXMC1D,-kYMC1Dp,kZMCp, 0, "ONLY", tpar, 3);
1416
1417
1418      tpar1save=tpar[1];
1419      y1msave=kYMC1Dm;
1420      y1psave=kYMC1Dp;
1421      const Float_t kYMC1Ep=(y1msave+tpar1save)*zpm+tpar[1];
1422      const Float_t kYMC1Em=(y1psave+tpar1save)*zmp+tpar[1];
1423
1424      gMC->Gsposp("CC1A", 15, "CM11",kXMC1D,kYMC1Ep,kZMCp, 0, "ONLY", tpar, 3);
1425      gMC->Gsposp("CC1A", 16, "CM11",-kXMC1D,kYMC1Em,kZMCm, 0, "ONLY", tpar, 3);
1426      gMC->Gsposp("CC1A", 17, "CM11",kXMC1D,-kYMC1Ep,kZMCp, 0, "ONLY", tpar, 3);
1427      gMC->Gsposp("CC1A", 18, "CM11",-kXMC1D,-kYMC1Em,kZMCm, 0, "ONLY", tpar, 3);
1428
1429      tpar1save=tpar[1];
1430      y1msave=kYMC1Em;
1431      y1psave=kYMC1Ep;
1432      const Float_t kYMC1Fp=(y1msave+tpar1save)*zpm+tpar[1];
1433      const Float_t kYMC1Fm=(y1psave+tpar1save)*zmp+tpar[1];
1434
1435      gMC->Gsposp("CC1A", 19, "CM11",kXMC1D,kYMC1Fm,kZMCm, 0, "ONLY", tpar, 3);
1436      gMC->Gsposp("CC1A", 20, "CM11",-kXMC1D,kYMC1Fp,kZMCp, 0, "ONLY", tpar, 3);
1437      gMC->Gsposp("CC1A", 21, "CM11",kXMC1D,-kYMC1Fm,kZMCm, 0, "ONLY", tpar, 3);
1438      gMC->Gsposp("CC1A", 22, "CM11",-kXMC1D,-kYMC1Fp,kZMCp, 0, "ONLY", tpar, 3);
1439
1440 // Positioning first plane in ALICE
1441      gMC->Gspos("CM11", 1, "ALIC", 0., 0., zpos1, 0, "ONLY");
1442
1443 // End of geometry definition for the first plane of station 1
1444
1445
1446
1447 // SECOND PLANE OF STATION 1 : proj ratio = zpos2/zpos1
1448
1449      const Float_t kZ12=zpos2/zpos1;
1450
1451 // Definition of prototype for chambers in the second plane of station 1
1452
1453      tpar[0]= 0.;
1454      tpar[1]= 0.;
1455      tpar[2]= 0.;
1456
1457      gMC->Gsvolu("CC2A", "BOX ", idAlu1, tpar, 0);           //Al
1458      gMC->Gsvolu("CB2A", "BOX ", idtmed[1107], tpar, 0);     //Bakelite
1459      gMC->Gsvolu("CG2A", "BOX ", idtmed[1106], tpar, 0);     //Gas streamer
1460
1461 // chamber type A
1462      tpar[0] = -1.;
1463      tpar[1] = -1.;
1464
1465      const Float_t kXMC2A=kXMC1A*kZ12;
1466      const Float_t kYMC2Am=0.;
1467      const Float_t kYMC2Ap=0.;
1468
1469      tpar[2] = 0.1;
1470      gMC->Gsposp("CG2A", 1, "CB2A", 0., 0., 0., 0, "ONLY",tpar,3);
1471      tpar[2] = 0.3;
1472      gMC->Gsposp("CB2A", 1, "CC2A", 0., 0., 0., 0, "ONLY",tpar,3);
1473
1474      tpar[2] = 0.4;
1475      tpar[0] = ((kXMC1MAX-kXMC1MED)/2.)*kZ12;
1476      tpar[1] = kYMC1MIN*kZ12;
1477
1478      gMC->Gsposp("CC2A", 1, "CM12",kXMC2A,kYMC2Am,kZMCm, 0, "ONLY", tpar, 3);
1479      gMC->Gsposp("CC2A", 2, "CM12",-kXMC2A,kYMC2Ap,kZMCp, 0, "ONLY", tpar, 3);
1480
1481
1482 //  chamber type B
1483
1484      tpar[0] = ((kXMC1MAX-kXMC1MIN)/2.)*kZ12;
1485      tpar[1] = ((kYMC1MAX-kYMC1MIN)/2.)*kZ12;
1486
1487      const Float_t kXMC2B=kXMC1B*kZ12;
1488      const Float_t kYMC2Bp=kYMC1Bp*kZ12;
1489      const Float_t kYMC2Bm=kYMC1Bm*kZ12;
1490      gMC->Gsposp("CC2A", 3, "CM12",kXMC2B,kYMC2Bp,kZMCp, 0, "ONLY", tpar, 3);
1491      gMC->Gsposp("CC2A", 4, "CM12",-kXMC2B,kYMC2Bm,kZMCm, 0, "ONLY", tpar, 3);
1492      gMC->Gsposp("CC2A", 5, "CM12",kXMC2B,-kYMC2Bp,kZMCp, 0, "ONLY", tpar, 3);
1493      gMC->Gsposp("CC2A", 6, "CM12",-kXMC2B,-kYMC2Bm,kZMCm, 0, "ONLY", tpar, 3);
1494
1495
1496 //  chamber type C   (end of type B !!)
1497
1498      tpar[0] = (kXMC1MAX/2)*kZ12;
1499      tpar[1] = (kYMC1MAX/2)*kZ12;
1500
1501      const Float_t kXMC2C=kXMC1C*kZ12;
1502      const Float_t kYMC2Cp=kYMC1Cp*kZ12;
1503      const Float_t kYMC2Cm=kYMC1Cm*kZ12;
1504      gMC->Gsposp("CC2A", 7, "CM12",kXMC2C,kYMC2Cp,kZMCp, 0, "ONLY", tpar, 3);
1505      gMC->Gsposp("CC2A", 8, "CM12",-kXMC2C,kYMC2Cm,kZMCm, 0, "ONLY", tpar, 3);
1506      gMC->Gsposp("CC2A", 9, "CM12",kXMC2C,-kYMC2Cp,kZMCp, 0, "ONLY", tpar, 3);
1507      gMC->Gsposp("CC2A", 10, "CM12",-kXMC2C,-kYMC2Cm,kZMCm, 0, "ONLY", tpar, 3);
1508
1509 //  chamber type D, E and F (same size)
1510
1511      tpar[0] = (kXMC1MAX/2.)*kZ12;
1512      tpar[1] = kYMC1MIN*kZ12;
1513
1514      const Float_t kXMC2D=kXMC1D*kZ12;
1515      const Float_t kYMC2Dp=kYMC1Dp*kZ12;
1516      const Float_t kYMC2Dm=kYMC1Dm*kZ12;
1517      gMC->Gsposp("CC2A", 11, "CM12",kXMC2D,kYMC2Dm,kZMCm, 0, "ONLY", tpar, 3);
1518      gMC->Gsposp("CC2A", 12, "CM12",-kXMC2D,kYMC2Dp,kZMCp, 0, "ONLY", tpar, 3);
1519      gMC->Gsposp("CC2A", 13, "CM12",kXMC2D,-kYMC2Dm,kZMCm, 0, "ONLY", tpar, 3);
1520      gMC->Gsposp("CC2A", 14, "CM12",-kXMC2D,-kYMC2Dp,kZMCp, 0, "ONLY", tpar, 3);
1521
1522      const Float_t kYMC2Ep=kYMC1Ep*kZ12;
1523      const Float_t kYMC2Em=kYMC1Em*kZ12;
1524      gMC->Gsposp("CC2A", 15, "CM12",kXMC2D,kYMC2Ep,kZMCp, 0, "ONLY", tpar, 3);
1525      gMC->Gsposp("CC2A", 16, "CM12",-kXMC2D,kYMC2Em,kZMCm, 0, "ONLY", tpar, 3);
1526      gMC->Gsposp("CC2A", 17, "CM12",kXMC2D,-kYMC2Ep,kZMCp, 0, "ONLY", tpar, 3);
1527      gMC->Gsposp("CC2A", 18, "CM12",-kXMC2D,-kYMC2Em,kZMCm, 0, "ONLY", tpar, 3);
1528
1529
1530      const Float_t kYMC2Fp=kYMC1Fp*kZ12;
1531      const Float_t kYMC2Fm=kYMC1Fm*kZ12;
1532      gMC->Gsposp("CC2A", 19, "CM12",kXMC2D,kYMC2Fm,kZMCm, 0, "ONLY", tpar, 3);
1533      gMC->Gsposp("CC2A", 20, "CM12",-kXMC2D,kYMC2Fp,kZMCp, 0, "ONLY", tpar, 3);
1534      gMC->Gsposp("CC2A", 21, "CM12",kXMC2D,-kYMC2Fm,kZMCm, 0, "ONLY", tpar, 3);
1535      gMC->Gsposp("CC2A", 22, "CM12",-kXMC2D,-kYMC2Fp,kZMCp, 0, "ONLY", tpar, 3);
1536
1537 // Positioning second plane of station 1 in ALICE
1538
1539      gMC->Gspos("CM12", 1, "ALIC", 0., 0., zpos2, 0, "ONLY");
1540
1541 // End of geometry definition for the second plane of station 1
1542
1543
1544
1545 // TRIGGER STATION 2 - TRIGGER STATION 2 - TRIGGER STATION 2
1546
1547      // 03/00
1548      // zpos3 and zpos4 are now the middle of the first and second
1549      // plane of station 2 :
1550      // zpos3=(17075+16995)/2=17035 mm, thick/2=40 mm
1551      // zpos4=(17225+17145)/2=17185 mm, thick/2=40 mm
1552      //
1553      // zpos3m=16999 mm , zpos3p=17071 mm (middles of gas gaps)
1554      // zpos4m=17149 mm , zpos4p=17221 mm (middles of gas gaps)
1555      // rem : the total thickness accounts for 1 mm of al on both
1556      // side of the RPCs (see zpos3 and zpos4), as previously
1557      iChamber1 = iChamber = (AliMUONChamber*) (*fChambers)[12];
1558      iChamber2 =(AliMUONChamber*) (*fChambers)[13];
1559      Float_t zpos3=iChamber1->Z();
1560      Float_t zpos4=iChamber2->Z();
1561
1562
1563 // Mother volume definition
1564      tpar[0] = iChamber->RInner();
1565      tpar[1] = iChamber->ROuter();
1566      tpar[2] = 4.0;
1567
1568      gMC->Gsvolu("CM21", "TUBE", idAir, tpar, 3);
1569      gMC->Gsvolu("CM22", "TUBE", idAir, tpar, 3);
1570
1571 // Definition of the flange between the beam shielding and the RPC
1572 //  ???? interface shielding
1573
1574      tpar[0]= kRMIN2;
1575      tpar[1]= kRMAX2;
1576      tpar[2]= 4.0;
1577
1578      gMC->Gsvolu("CF2A", "TUBE", idAlu1, tpar, 3);            //Al
1579      gMC->Gspos("CF2A", 1, "CM21", 0., 0., 0., 0, "MANY");
1580      gMC->Gspos("CF2A", 2, "CM22", 0., 0., 0., 0, "MANY");
1581
1582
1583
1584 // FIRST PLANE OF STATION 2 : proj ratio = zpos3/zpos1
1585
1586      const Float_t kZ13=zpos3/zpos1;
1587
1588 // Definition of prototype for chambers in the first plane of station 2
1589      tpar[0]= 0.;
1590      tpar[1]= 0.;
1591      tpar[2]= 0.;
1592
1593      gMC->Gsvolu("CC3A", "BOX ", idAlu1, tpar, 0);           //Al
1594      gMC->Gsvolu("CB3A", "BOX ", idtmed[1107], tpar, 0);     //Bakelite
1595      gMC->Gsvolu("CG3A", "BOX ", idtmed[1106], tpar, 0);     //Gas streamer
1596
1597
1598 // chamber type A
1599      tpar[0] = -1.;
1600      tpar[1] = -1.;
1601
1602      const Float_t kXMC3A=kXMC1A*kZ13;
1603      const Float_t kYMC3Am=0.;
1604      const Float_t kYMC3Ap=0.;
1605
1606      tpar[2] = 0.1;
1607      gMC->Gsposp("CG3A", 1, "CB3A", 0., 0., 0., 0, "ONLY",tpar,3);
1608      tpar[2] = 0.3;
1609      gMC->Gsposp("CB3A", 1, "CC3A", 0., 0., 0., 0, "ONLY",tpar,3);
1610
1611      tpar[2] = 0.4;
1612      tpar[0] = ((kXMC1MAX-kXMC1MED)/2.)*kZ13;
1613      tpar[1] = kYMC1MIN*kZ13;
1614      gMC->Gsposp("CC3A", 1, "CM21",kXMC3A,kYMC3Am,kZMCm, 0, "ONLY", tpar, 3);
1615      gMC->Gsposp("CC3A", 2, "CM21",-kXMC3A,kYMC3Ap,kZMCp, 0, "ONLY", tpar, 3);
1616
1617
1618 //  chamber type B
1619      tpar[0] = ((kXMC1MAX-kXMC1MIN)/2.)*kZ13;
1620      tpar[1] = ((kYMC1MAX-kYMC1MIN)/2.)*kZ13;
1621
1622      const Float_t kXMC3B=kXMC1B*kZ13;
1623      const Float_t kYMC3Bp=kYMC1Bp*kZ13;
1624      const Float_t kYMC3Bm=kYMC1Bm*kZ13;
1625      gMC->Gsposp("CC3A", 3, "CM21",kXMC3B,kYMC3Bp,kZMCp, 0, "ONLY", tpar, 3);
1626      gMC->Gsposp("CC3A", 4, "CM21",-kXMC3B,kYMC3Bm,kZMCm, 0, "ONLY", tpar, 3);
1627      gMC->Gsposp("CC3A", 5, "CM21",kXMC3B,-kYMC3Bp,kZMCp, 0, "ONLY", tpar, 3);
1628      gMC->Gsposp("CC3A", 6, "CM21",-kXMC3B,-kYMC3Bm,kZMCm, 0, "ONLY", tpar, 3);
1629
1630
1631 //  chamber type C  (end of type B !!)
1632      tpar[0] = (kXMC1MAX/2)*kZ13;
1633      tpar[1] = (kYMC1MAX/2)*kZ13;
1634
1635      const Float_t kXMC3C=kXMC1C*kZ13;
1636      const Float_t kYMC3Cp=kYMC1Cp*kZ13;
1637      const Float_t kYMC3Cm=kYMC1Cm*kZ13;
1638      gMC->Gsposp("CC3A", 7, "CM21",kXMC3C,kYMC3Cp,kZMCp, 0, "ONLY", tpar, 3);
1639      gMC->Gsposp("CC3A", 8, "CM21",-kXMC3C,kYMC3Cm,kZMCm, 0, "ONLY", tpar, 3);
1640      gMC->Gsposp("CC3A", 9, "CM21",kXMC3C,-kYMC3Cp,kZMCp, 0, "ONLY", tpar, 3);
1641      gMC->Gsposp("CC3A", 10, "CM21",-kXMC3C,-kYMC3Cm,kZMCm, 0, "ONLY", tpar, 3);
1642
1643
1644 //  chamber type D, E and F (same size)
1645
1646      tpar[0] = (kXMC1MAX/2.)*kZ13;
1647      tpar[1] = kYMC1MIN*kZ13;
1648
1649      const Float_t kXMC3D=kXMC1D*kZ13;
1650      const Float_t kYMC3Dp=kYMC1Dp*kZ13;
1651      const Float_t kYMC3Dm=kYMC1Dm*kZ13;
1652      gMC->Gsposp("CC3A", 11, "CM21",kXMC3D,kYMC3Dm,kZMCm, 0, "ONLY", tpar, 3);
1653      gMC->Gsposp("CC3A", 12, "CM21",-kXMC3D,kYMC3Dp,kZMCp, 0, "ONLY", tpar, 3);
1654      gMC->Gsposp("CC3A", 13, "CM21",kXMC3D,-kYMC3Dm,kZMCm, 0, "ONLY", tpar, 3);
1655      gMC->Gsposp("CC3A", 14, "CM21",-kXMC3D,-kYMC3Dp,kZMCp, 0, "ONLY", tpar, 3);
1656
1657      const Float_t kYMC3Ep=kYMC1Ep*kZ13;
1658      const Float_t kYMC3Em=kYMC1Em*kZ13;
1659      gMC->Gsposp("CC3A", 15, "CM21",kXMC3D,kYMC3Ep,kZMCp, 0, "ONLY", tpar, 3);
1660      gMC->Gsposp("CC3A", 16, "CM21",-kXMC3D,kYMC3Em,kZMCm, 0, "ONLY", tpar, 3);
1661      gMC->Gsposp("CC3A", 17, "CM21",kXMC3D,-kYMC3Ep,kZMCp, 0, "ONLY", tpar, 3);
1662      gMC->Gsposp("CC3A", 18, "CM21",-kXMC3D,-kYMC3Em,kZMCm, 0, "ONLY", tpar, 3);
1663
1664      const Float_t kYMC3Fp=kYMC1Fp*kZ13;
1665      const Float_t kYMC3Fm=kYMC1Fm*kZ13;
1666      gMC->Gsposp("CC3A", 19, "CM21",kXMC3D,kYMC3Fm,kZMCm, 0, "ONLY", tpar, 3);
1667      gMC->Gsposp("CC3A", 20, "CM21",-kXMC3D,kYMC3Fp,kZMCp, 0, "ONLY", tpar, 3);
1668      gMC->Gsposp("CC3A", 21, "CM21",kXMC3D,-kYMC3Fm,kZMCm, 0, "ONLY", tpar, 3);
1669      gMC->Gsposp("CC3A", 22, "CM21",-kXMC3D,-kYMC3Fp,kZMCp, 0, "ONLY", tpar, 3);
1670
1671
1672 // Positioning first plane of station 2 in ALICE
1673
1674      gMC->Gspos("CM21", 1, "ALIC", 0., 0., zpos3, 0, "ONLY");
1675
1676 // End of geometry definition for the first plane of station 2
1677
1678
1679
1680
1681 // SECOND PLANE OF STATION 2 : proj ratio = zpos4/zpos1
1682
1683      const Float_t kZ14=zpos4/zpos1;
1684
1685 // Definition of prototype for chambers in the second plane of station 2
1686
1687      tpar[0]= 0.;
1688      tpar[1]= 0.;
1689      tpar[2]= 0.;
1690
1691      gMC->Gsvolu("CC4A", "BOX ", idAlu1, tpar, 0);           //Al
1692      gMC->Gsvolu("CB4A", "BOX ", idtmed[1107], tpar, 0);     //Bakelite
1693      gMC->Gsvolu("CG4A", "BOX ", idtmed[1106], tpar, 0);     //Gas streamer
1694
1695 // chamber type A
1696      tpar[0] = -1.;
1697      tpar[1] = -1.;
1698
1699      const Float_t kXMC4A=kXMC1A*kZ14;
1700      const Float_t kYMC4Am=0.;
1701      const Float_t kYMC4Ap=0.;
1702
1703      tpar[2] = 0.1;
1704      gMC->Gsposp("CG4A", 1, "CB4A", 0., 0., 0., 0, "ONLY",tpar,3);
1705      tpar[2] = 0.3;
1706      gMC->Gsposp("CB4A", 1, "CC4A", 0., 0., 0., 0, "ONLY",tpar,3);
1707
1708      tpar[2] = 0.4;
1709      tpar[0] = ((kXMC1MAX-kXMC1MED)/2.)*kZ14;
1710      tpar[1] = kYMC1MIN*kZ14;
1711      gMC->Gsposp("CC4A", 1, "CM22",kXMC4A,kYMC4Am,kZMCm, 0, "ONLY", tpar, 3);
1712      gMC->Gsposp("CC4A", 2, "CM22",-kXMC4A,kYMC4Ap,kZMCp, 0, "ONLY", tpar, 3);
1713
1714
1715 //  chamber type B
1716      tpar[0] = ((kXMC1MAX-kXMC1MIN)/2.)*kZ14;
1717      tpar[1] = ((kYMC1MAX-kYMC1MIN)/2.)*kZ14;
1718
1719      const Float_t kXMC4B=kXMC1B*kZ14;
1720      const Float_t kYMC4Bp=kYMC1Bp*kZ14;
1721      const Float_t kYMC4Bm=kYMC1Bm*kZ14;
1722      gMC->Gsposp("CC4A", 3, "CM22",kXMC4B,kYMC4Bp,kZMCp, 0, "ONLY", tpar, 3);
1723      gMC->Gsposp("CC4A", 4, "CM22",-kXMC4B,kYMC4Bm,kZMCm, 0, "ONLY", tpar, 3);
1724      gMC->Gsposp("CC4A", 5, "CM22",kXMC4B,-kYMC4Bp,kZMCp, 0, "ONLY", tpar, 3);
1725      gMC->Gsposp("CC4A", 6, "CM22",-kXMC4B,-kYMC4Bm,kZMCm, 0, "ONLY", tpar, 3);
1726
1727
1728 //  chamber type C   (end of type B !!)
1729      tpar[0] =(kXMC1MAX/2)*kZ14;
1730      tpar[1] =  (kYMC1MAX/2)*kZ14;
1731
1732      const Float_t kXMC4C=kXMC1C*kZ14;
1733      const Float_t kYMC4Cp=kYMC1Cp*kZ14;
1734      const Float_t kYMC4Cm=kYMC1Cm*kZ14;
1735      gMC->Gsposp("CC4A", 7, "CM22",kXMC4C,kYMC4Cp,kZMCp, 0, "ONLY", tpar, 3);
1736      gMC->Gsposp("CC4A", 8, "CM22",-kXMC4C,kYMC4Cm,kZMCm, 0, "ONLY", tpar, 3);
1737      gMC->Gsposp("CC4A", 9, "CM22",kXMC4C,-kYMC4Cp,kZMCp, 0, "ONLY", tpar, 3);
1738      gMC->Gsposp("CC4A", 10, "CM22",-kXMC4C,-kYMC4Cm,kZMCm, 0, "ONLY", tpar, 3);
1739
1740
1741 //  chamber type D, E and F (same size)
1742      tpar[0] = (kXMC1MAX/2.)*kZ14;
1743      tpar[1] =  kYMC1MIN*kZ14;
1744
1745      const Float_t kXMC4D=kXMC1D*kZ14;
1746      const Float_t kYMC4Dp=kYMC1Dp*kZ14;
1747      const Float_t kYMC4Dm=kYMC1Dm*kZ14;
1748      gMC->Gsposp("CC4A", 11, "CM22",kXMC4D,kYMC4Dm,kZMCm, 0, "ONLY", tpar, 3);
1749      gMC->Gsposp("CC4A", 12, "CM22",-kXMC4D,kYMC4Dp,kZMCp, 0, "ONLY", tpar, 3);
1750      gMC->Gsposp("CC4A", 13, "CM22",kXMC4D,-kYMC4Dm,kZMCm, 0, "ONLY", tpar, 3);
1751      gMC->Gsposp("CC4A", 14, "CM22",-kXMC4D,-kYMC4Dp,kZMCp, 0, "ONLY", tpar, 3);
1752
1753      const Float_t kYMC4Ep=kYMC1Ep*kZ14;
1754      const Float_t kYMC4Em=kYMC1Em*kZ14;
1755      gMC->Gsposp("CC4A", 15, "CM22",kXMC4D,kYMC4Ep,kZMCp, 0, "ONLY", tpar, 3);
1756      gMC->Gsposp("CC4A", 16, "CM22",-kXMC4D,kYMC4Em,kZMCm, 0, "ONLY", tpar, 3);
1757      gMC->Gsposp("CC4A", 17, "CM22",kXMC4D,-kYMC4Ep,kZMCp, 0, "ONLY", tpar, 3);
1758      gMC->Gsposp("CC4A", 18, "CM22",-kXMC4D,-kYMC4Em,kZMCm, 0, "ONLY", tpar, 3);
1759
1760      const Float_t kYMC4Fp=kYMC1Fp*kZ14;
1761      const Float_t kYMC4Fm=kYMC1Fm*kZ14;
1762      gMC->Gsposp("CC4A", 19, "CM22",kXMC4D,kYMC4Fm,kZMCm, 0, "ONLY", tpar, 3);
1763      gMC->Gsposp("CC4A", 20, "CM22",-kXMC4D,kYMC4Fp,kZMCp, 0, "ONLY", tpar, 3);
1764      gMC->Gsposp("CC4A", 21, "CM22",kXMC4D,-kYMC4Fm,kZMCm, 0, "ONLY", tpar, 3);
1765      gMC->Gsposp("CC4A", 22, "CM22",-kXMC4D,-kYMC4Fp,kZMCp, 0, "ONLY", tpar, 3);
1766
1767
1768 // Positioning second plane of station 2 in ALICE
1769
1770      gMC->Gspos("CM22", 1, "ALIC", 0., 0., zpos4, 0, "ONLY");
1771
1772 // End of geometry definition for the second plane of station 2
1773
1774 // End of trigger geometry definition
1775
1776 }
1777
1778
1779
1780 //___________________________________________
1781 void AliMUONv1::CreateMaterials()
1782 {
1783   // *** DEFINITION OF AVAILABLE MUON MATERIALS ***
1784   //
1785   //     Ar-CO2 gas (80%+20%)
1786     Float_t ag1[3]   = { 39.95,12.01,16. };
1787     Float_t zg1[3]   = { 18.,6.,8. };
1788     Float_t wg1[3]   = { .8,.0667,.13333 };
1789     Float_t dg1      = .001821;
1790     //
1791     //     Ar-buthane-freon gas -- trigger chambers
1792     Float_t atr1[4]  = { 39.95,12.01,1.01,19. };
1793     Float_t ztr1[4]  = { 18.,6.,1.,9. };
1794     Float_t wtr1[4]  = { .56,.1262857,.2857143,.028 };
1795     Float_t dtr1     = .002599;
1796     //
1797     //     Ar-CO2 gas
1798     Float_t agas[3]  = { 39.95,12.01,16. };
1799     Float_t zgas[3]  = { 18.,6.,8. };
1800     Float_t wgas[3]  = { .74,.086684,.173316 };
1801     Float_t dgas     = .0018327;
1802     //
1803     //     Ar-Isobutane gas (80%+20%) -- tracking
1804     Float_t ag[3]    = { 39.95,12.01,1.01 };
1805     Float_t zg[3]    = { 18.,6.,1. };
1806     Float_t wg[3]    = { .8,.057,.143 };
1807     Float_t dg       = .0019596;
1808     //
1809     //     Ar-Isobutane-Forane-SF6 gas (49%+7%+40%+4%) -- trigger
1810     Float_t atrig[5] = { 39.95,12.01,1.01,19.,32.066 };
1811     Float_t ztrig[5] = { 18.,6.,1.,9.,16. };
1812     Float_t wtrig[5] = { .49,1.08,1.5,1.84,0.04 };
1813     Float_t dtrig    = .0031463;
1814     //
1815     //     bakelite
1816
1817     Float_t abak[3] = {12.01 , 1.01 , 16.};
1818     Float_t zbak[3] = {6.     , 1.   , 8.};
1819     Float_t wbak[3] = {6.     , 6.   , 1.};
1820     Float_t dbak = 1.4;
1821
1822     Float_t epsil, stmin, deemax, tmaxfd, stemax;
1823
1824     Int_t iSXFLD   = gAlice->Field()->Integ();
1825     Float_t sXMGMX = gAlice->Field()->Max();
1826     //
1827     // --- Define the various materials for GEANT ---
1828     AliMaterial(9, "ALUMINIUM$", 26.98, 13., 2.7, 8.9, 37.2);
1829     AliMaterial(10, "ALUMINIUM$", 26.98, 13., 2.7, 8.9, 37.2);
1830     AliMaterial(15, "AIR$      ", 14.61, 7.3, .001205, 30423.24, 67500);
1831     AliMixture(19, "Bakelite$", abak, zbak, dbak, -3, wbak);
1832     AliMixture(20, "ArC4H10 GAS$", ag, zg, dg, 3, wg);
1833     AliMixture(21, "TRIG GAS$", atrig, ztrig, dtrig, -5, wtrig);
1834     AliMixture(22, "ArCO2 80%$", ag1, zg1, dg1, 3, wg1);
1835     AliMixture(23, "Ar-freon $", atr1, ztr1, dtr1, 4, wtr1);
1836     AliMixture(24, "ArCO2 GAS$", agas, zgas, dgas, 3, wgas);
1837     // materials for slat:
1838     //     Sensitive area: gas (already defined)
1839     //     PCB: copper
1840     //     insulating material and frame: vetronite
1841     //     walls: carbon, rohacell, carbon
1842   Float_t aglass[5]={12.01, 28.09, 16.,   10.8,  23.};
1843   Float_t zglass[5]={ 6.,   14.,    8.,    5.,   11.};
1844   Float_t wglass[5]={ 0.5,  0.105, 0.355, 0.03,  0.01};
1845   Float_t dglass=1.74;
1846
1847   // rohacell: C9 H13 N1 O2
1848   Float_t arohac[4] = {12.01,  1.01, 14.010, 16.};
1849   Float_t zrohac[4] = { 6.,    1.,    7.,     8.};
1850   Float_t wrohac[4] = { 9.,   13.,    1.,     2.};
1851   Float_t drohac    = 0.03;
1852
1853   AliMaterial(31, "COPPER$",   63.54,    29.,   8.96,  1.4, 0.);
1854   AliMixture(32, "Vetronite$",aglass, zglass, dglass,    5, wglass);
1855   AliMaterial(33, "Carbon$",   12.01,     6.,  2.265, 18.8, 49.9);
1856   AliMixture(34, "Rohacell$", arohac, zrohac, drohac,   -4, wrohac);
1857
1858
1859     epsil  = .001; // Tracking precision,
1860     stemax = -1.;  // Maximum displacement for multiple scat
1861     tmaxfd = -20.; // Maximum angle due to field deflection
1862     deemax = -.3;  // Maximum fractional energy loss, DLS
1863     stmin  = -.8;
1864     //
1865     //    Air
1866     AliMedium(1, "AIR_CH_US         ", 15, 1, iSXFLD, sXMGMX, tmaxfd, stemax, deemax, epsil, stmin);
1867     //
1868     //    Aluminum
1869
1870     AliMedium(4, "ALU_CH_US          ", 9, 0, iSXFLD, sXMGMX, tmaxfd, fMaxStepAlu,
1871             fMaxDestepAlu, epsil, stmin);
1872     AliMedium(5, "ALU_CH_US          ", 10, 0, iSXFLD, sXMGMX, tmaxfd, fMaxStepAlu,
1873             fMaxDestepAlu, epsil, stmin);
1874     //
1875     //    Ar-isoC4H10 gas
1876
1877     AliMedium(6, "AR_CH_US          ", 20, 1, iSXFLD, sXMGMX, tmaxfd, fMaxStepGas,
1878             fMaxDestepGas, epsil, stmin);
1879 //
1880     //    Ar-Isobuthane-Forane-SF6 gas
1881
1882     AliMedium(7, "GAS_CH_TRIGGER    ", 21, 1, iSXFLD, sXMGMX, tmaxfd, stemax, deemax, epsil, stmin);
1883
1884     AliMedium(8, "BAKE_CH_TRIGGER   ", 19, 0, iSXFLD, sXMGMX, tmaxfd, fMaxStepAlu,
1885             fMaxDestepAlu, epsil, stmin);
1886
1887     AliMedium(9, "ARG_CO2   ", 22, 1, iSXFLD, sXMGMX, tmaxfd, fMaxStepGas,
1888             fMaxDestepAlu, epsil, stmin);
1889     // tracking media for slats: check the parameters!!
1890     AliMedium(11, "PCB_COPPER        ", 31, 0, iSXFLD, sXMGMX, tmaxfd,
1891               fMaxStepAlu, fMaxDestepAlu, epsil, stmin);
1892     AliMedium(12, "VETRONITE         ", 32, 0, iSXFLD, sXMGMX, tmaxfd,
1893               fMaxStepAlu, fMaxDestepAlu, epsil, stmin);
1894     AliMedium(13, "CARBON            ", 33, 0, iSXFLD, sXMGMX, tmaxfd,
1895               fMaxStepAlu, fMaxDestepAlu, epsil, stmin);
1896     AliMedium(14, "Rohacell          ", 34, 0, iSXFLD, sXMGMX, tmaxfd,
1897               fMaxStepAlu, fMaxDestepAlu, epsil, stmin);
1898 }
1899
1900 //___________________________________________
1901
1902 void AliMUONv1::Init()
1903 {
1904    //
1905    // Initialize Tracking Chambers
1906    //
1907
1908    printf("\n\n\n Start Init for version 1 - CPC chamber type\n\n\n");
1909    Int_t i;
1910    for (i=0; i<AliMUONConstants::NCh(); i++) {
1911        ( (AliMUONChamber*) (*fChambers)[i])->Init();
1912    }
1913
1914    //
1915    // Set the chamber (sensitive region) GEANT identifier
1916    AliMC* gMC = AliMC::GetMC();
1917    ((AliMUONChamber*)(*fChambers)[0])->SetGid(gMC->VolId("C01G"));
1918    ((AliMUONChamber*)(*fChambers)[1])->SetGid(gMC->VolId("C02G"));
1919
1920    ((AliMUONChamber*)(*fChambers)[2])->SetGid(gMC->VolId("C03G"));
1921    ((AliMUONChamber*)(*fChambers)[3])->SetGid(gMC->VolId("C04G"));
1922
1923    ((AliMUONChamber*)(*fChambers)[4])->SetGid(gMC->VolId("S05G"));
1924    ((AliMUONChamber*)(*fChambers)[5])->SetGid(gMC->VolId("S06G"));
1925
1926    ((AliMUONChamber*)(*fChambers)[6])->SetGid(gMC->VolId("S07G"));
1927    ((AliMUONChamber*)(*fChambers)[7])->SetGid(gMC->VolId("S08G"));
1928
1929    ((AliMUONChamber*)(*fChambers)[8])->SetGid(gMC->VolId("S09G"));
1930    ((AliMUONChamber*)(*fChambers)[9])->SetGid(gMC->VolId("S10G"));
1931
1932    ((AliMUONChamber*)(*fChambers)[10])->SetGid(gMC->VolId("CG1A"));
1933    ((AliMUONChamber*)(*fChambers)[11])->SetGid(gMC->VolId("CG2A"));
1934    ((AliMUONChamber*)(*fChambers)[12])->SetGid(gMC->VolId("CG3A"));
1935    ((AliMUONChamber*)(*fChambers)[13])->SetGid(gMC->VolId("CG4A"));
1936
1937    printf("\n\n\n Finished Init for version 0 - CPC chamber type\n\n\n");
1938
1939    //cp
1940    printf("\n\n\n Start Init for Trigger Circuits\n\n\n");
1941    for (i=0; i<AliMUONConstants::NTriggerCircuit(); i++) {
1942      ( (AliMUONTriggerCircuit*) (*fTriggerCircuits)[i])->Init(i);
1943    }
1944    printf(" Finished Init for Trigger Circuits\n\n\n");
1945    //cp
1946
1947 }
1948
1949 //___________________________________________
1950 void AliMUONv1::StepManager()
1951 {
1952   Int_t          copy, id;
1953   static Int_t   idvol;
1954   static Int_t   vol[2];
1955   Int_t          ipart;
1956   TLorentzVector pos;
1957   TLorentzVector mom;
1958   Float_t        theta,phi;
1959   Float_t        destep, step;
1960
1961   static Float_t eloss, eloss2, xhit, yhit, zhit, tof, tlength;
1962   const  Float_t kBig=1.e10;
1963   //  modifs perso
1964   static Float_t hits[15];
1965
1966   TClonesArray &lhits = *fHits;
1967
1968   //
1969   // Set maximum step size for gas
1970   // numed=gMC->GetMedium();
1971   //
1972   // Only charged tracks
1973   if( !(gMC->TrackCharge()) ) return;
1974   //
1975   // Only gas gap inside chamber
1976   // Tag chambers and record hits when track enters
1977   idvol=-1;
1978   id=gMC->CurrentVolID(copy);
1979
1980     for (Int_t i=1; i<=AliMUONConstants::NCh(); i++) {
1981       if(id==((AliMUONChamber*)(*fChambers)[i-1])->GetGid()){
1982           vol[0]=i;
1983           idvol=i-1;
1984       }
1985     }
1986     if (idvol == -1) return;
1987   //
1988   // Get current particle id (ipart), track position (pos)  and momentum (mom)
1989   gMC->TrackPosition(pos);
1990   gMC->TrackMomentum(mom);
1991
1992   ipart  = gMC->TrackPid();
1993   //Int_t ipart1 = gMC->IdFromPDG(ipart);
1994   //printf("ich, ipart %d %d \n",vol[0],ipart1);
1995
1996   //
1997   // momentum loss and steplength in last step
1998   destep = gMC->Edep();
1999   step   = gMC->TrackStep();
2000
2001   //
2002   // record hits when track enters ...
2003   if( gMC->IsTrackEntering()) {
2004       gMC->SetMaxStep(fMaxStepGas);
2005       Double_t tc = mom[0]*mom[0]+mom[1]*mom[1];
2006       Double_t rt = TMath::Sqrt(tc);
2007       Double_t pmom = TMath::Sqrt(tc+mom[2]*mom[2]);
2008       Double_t tx=mom[0]/pmom;
2009       Double_t ty=mom[1]/pmom;
2010       Double_t tz=mom[2]/pmom;
2011       Double_t s=((AliMUONChamber*)(*fChambers)[idvol])
2012           ->ResponseModel()
2013           ->Pitch()/tz;
2014       theta   = Float_t(TMath::ATan2(rt,Double_t(mom[2])))*kRaddeg;
2015       phi     = Float_t(TMath::ATan2(Double_t(mom[1]),Double_t(mom[0])))*kRaddeg;
2016       hits[0] = Float_t(ipart);         // Geant3 particle type
2017       hits[1] = pos[0]+s*tx;                 // X-position for hit
2018       hits[2] = pos[1]+s*ty;                 // Y-position for hit
2019       hits[3] = pos[2]+s*tz;                 // Z-position for hit
2020       hits[4] = theta;                  // theta angle of incidence
2021       hits[5] = phi;                    // phi angle of incidence
2022       hits[8] = (Float_t) fNPadHits;   // first padhit
2023       hits[9] = -1;                     // last pad hit
2024
2025       // modifs perso
2026       hits[10] = mom[3]; // hit momentum P
2027       hits[11] = mom[0]; // Px/P
2028       hits[12] = mom[1]; // Py/P
2029       hits[13] = mom[2]; // Pz/P
2030       // fin modifs perso
2031       tof=gMC->TrackTime();
2032       hits[14] = tof;    // Time of flight
2033       // phi angle of incidence
2034       tlength = 0;
2035       eloss   = 0;
2036       eloss2  = 0;
2037       xhit    = pos[0];
2038       yhit    = pos[1];
2039       zhit    = pos[2];
2040       Chamber(idvol).ChargeCorrelationInit();
2041       // Only if not trigger chamber
2042
2043
2044
2045
2046       if(idvol<AliMUONConstants::NTrackingCh()) {
2047           //
2048           //  Initialize hit position (cursor) in the segmentation model
2049           ((AliMUONChamber*) (*fChambers)[idvol])
2050               ->SigGenInit(pos[0], pos[1], pos[2]);
2051       } else {
2052           //geant3->Gpcxyz();
2053           //printf("In the Trigger Chamber #%d\n",idvol-9);
2054       }
2055   }
2056   eloss2+=destep;
2057
2058   //
2059   // Calculate the charge induced on a pad (disintegration) in case
2060   //
2061   // Mip left chamber ...
2062   if( gMC->IsTrackExiting() || gMC->IsTrackStop() || gMC->IsTrackDisappeared()){
2063       gMC->SetMaxStep(kBig);
2064       eloss   += destep;
2065       tlength += step;
2066
2067       Float_t x0,y0,z0;
2068       Float_t localPos[3];
2069       Float_t globalPos[3] = {pos[0], pos[1], pos[2]};
2070       gMC->Gmtod(globalPos,localPos,1);
2071
2072       if(idvol<AliMUONConstants::NTrackingCh()) {
2073 // tracking chambers
2074           x0 = 0.5*(xhit+pos[0]);
2075           y0 = 0.5*(yhit+pos[1]);
2076           z0 = 0.5*(zhit+pos[2]);
2077           //      z0 = localPos[2];
2078       } else {
2079 // trigger chambers
2080           x0=xhit;
2081           y0=yhit;
2082 //        z0=yhit;
2083           z0=0.;
2084       }
2085
2086
2087       if (eloss >0)  MakePadHits(x0,y0,z0,eloss,tof,idvol);
2088
2089
2090       hits[6]=tlength;
2091       hits[7]=eloss2;
2092       if (fNPadHits > (Int_t)hits[8]) {
2093           hits[8]= hits[8]+1;
2094           hits[9]= (Float_t) fNPadHits;
2095       }
2096
2097       new(lhits[fNhits++])
2098           AliMUONHit(fIshunt,gAlice->CurrentTrack(),vol,hits);
2099       eloss = 0;
2100       //
2101       // Check additional signal generation conditions
2102       // defined by the segmentation
2103       // model (boundary crossing conditions)
2104       // only for tracking chambers
2105   } else if
2106       ((idvol < AliMUONConstants::NTrackingCh()) &&
2107        ((AliMUONChamber*) (*fChambers)[idvol])->SigGenCond(pos[0], pos[1], pos[2]))
2108   {
2109       ((AliMUONChamber*) (*fChambers)[idvol])
2110           ->SigGenInit(pos[0], pos[1], pos[2]);
2111
2112       Float_t localPos[3];
2113       Float_t globalPos[3] = {pos[0], pos[1], pos[2]};
2114       gMC->Gmtod(globalPos,localPos,1);
2115
2116       eloss    += destep;
2117
2118       if (eloss > 0 && idvol < AliMUONConstants::NTrackingCh())
2119         MakePadHits(0.5*(xhit+pos[0]),0.5*(yhit+pos[1]),pos[2],eloss,tof,idvol);
2120       xhit     = pos[0];
2121       yhit     = pos[1];
2122       zhit     = pos[2];
2123       eloss = 0;
2124       tlength += step ;
2125       //
2126       // nothing special  happened, add up energy loss
2127   } else {
2128       eloss   += destep;
2129       tlength += step ;
2130   }
2131 }
2132
2133