TPC/AliTPCv3.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 purpose. It is          *
  13  * provided "as is" without express or implied warranty.                  *
  14  **************************************************************************/
  15
  16 /* $Id$ */
  17
  18 //
  19 ///////////////////////////////////////////////////////////////////////////////
  20 //                                                                           //
  21 //  Time Projection Chamber version 3 -- detailed TPC and slow simulation    //
  22 //
  23 //Begin_Html
  24 /*
  25 <img src="picts/AliTPCv3Class.gif">
  26 */
  27 //End_Html
  28 //                                                                           //
  29 //                                                                           //
  30 ///////////////////////////////////////////////////////////////////////////////
  31
  32 #include <stdlib.h>
  33
  34 #include <TInterpreter.h>
  35 #include <TLorentzVector.h>
  36 #include <TMath.h>
  37 #include <TVirtualMC.h>
  38 #include <TPDGCode.h>
  39 #include <TString.h>
  40 #include <TSystem.h>
  41
  42 #include "AliConst.h"
  43 #include "AliRun.h"
  44 #include "AliTPCDigitsArray.h"
  45 #include "AliTPCParam.h"
  46 #include "AliTPCParamSR.h"
  47 #include "AliTPCTrackHitsV2.h"
  48 #include "AliTPCv3.h"
  49 #include "AliMC.h"
  50 #include "TGeoManager.h"
  51 #include "TGeoVolume.h"
  52 #include "TGeoPcon.h"
  53 #include "TGeoTube.h"
  54 #include "TGeoPgon.h"
  55 #include "TGeoTrd1.h"
  56 #include "TGeoCompositeShape.h"
  57 #include "TGeoPara.h"
  58
  59 ClassImp(AliTPCv3)
  60 //_____________________________________________________________________________
  61
  62   AliTPCv3::AliTPCv3(){
  63
  64   fHitType = 1;
  65
  66 }
  67
  68 //_____________________________________________________________________________
  69 AliTPCv3::AliTPCv3(const char *name, const char *title) :
  70   AliTPC(name, title)
  71 {
  72   //
  73   // Standard constructor for Time Projection Chamber version 3
  74   //
  75
  76   SetBufferSize(128000);
  77   fIdSens=0;
  78
  79
  80   if (fTPCParam)
  81      fTPCParam->Write(fTPCParam->GetTitle());
  82
  83   fHitType =1;
  84 }
  85
  86 //_____________________________________________________________________________
  87 void AliTPCv3::CreateGeometry()
  88 {
  89   //
  90   // Creation of the TPC coarse geometry (version 3)
  91   // The whole drift volume is sensitive
  92   // Origin Marek Kowalski Cracow
  93   //
  94   //Begin_Html
  95   /*
  96     <img src="picts/AliTPCgif">
  97   */
  98   //End_Html
  99   //Begin_Html
 100   /*
 101     <img src="picts/AliTPCv3Tree.gif">
 102   */
 103   //End_Html
 104    //----------------------------------------------------------
 105   // This geometry is written using TGeo class
 106   // Firstly the shapes are defined, and only then the volumes
 107   // What is recognized by the MC are volumes
 108   //----------------------------------------------------------
 109   //
 110   //  tpc - this will be the mother volume
 111   //
 112
 113   //
 114   // here I define a volume TPC
 115   // retrive the medium name with "TPC_" as a leading string
 116   //
 117   TGeoPcon *tpc = new TGeoPcon(0.,360.,18); //18 sections
 118   tpc->DefineSection(0,-290.,77.,278.);
 119   tpc->DefineSection(1,-259.6,70.,278.);
 120   //
 121   tpc->DefineSection(2,-259.6,68.1,278.);
 122   tpc->DefineSection(3,-253.6,68.1,278.);
 123   //
 124   tpc->DefineSection(4,-253.6,68.,278.);
 125   tpc->DefineSection(5,-74.0,60.8,278.);
 126   //
 127   tpc->DefineSection(6,-74.0,60.1,278.);
 128   tpc->DefineSection(7,-73.3,60.1,278.);
 129   //
 130   tpc->DefineSection(8,-73.3,56.9,278.);
 131   tpc->DefineSection(9,73.3,56.9,278.);
 132   //
 133   tpc->DefineSection(10,73.3,60.1,278.);
 134   tpc->DefineSection(11,74.0,60.1,278.);
 135   //
 136   tpc->DefineSection(12,74.0,60.8,278.);
 137   tpc->DefineSection(13,253.6,65.5,278.);
 138   //
 139   tpc->DefineSection(14,253.6,65.6,278.);
 140   tpc->DefineSection(15,259.6,65.6,278.);
 141   //
 142   tpc->DefineSection(16,259.6,70.0,278.);
 143   tpc->DefineSection(17,290.,77.,278.);
 144   //
 145   TGeoMedium *m1 = gGeoManager->GetMedium("TPC_Air");
 146   TGeoVolume *v1 = new TGeoVolume("TPC_M",tpc,m1);
 147   //
 148   // drift volume - sensitive volume, extended beyond the
 149   // endcaps, because of the alignment
 150   //
 151   TGeoPcon *dvol = new TGeoPcon(0.,360.,6);
 152   dvol->DefineSection(0,-260.,74.5,264.4);
 153   dvol->DefineSection(1,-253.6,74.5,264.4);
 154   //
 155   dvol->DefineSection(2,-253.6,76.6774,258.);
 156   dvol->DefineSection(3,253.6,76.6774,258.);
 157   //
 158   dvol->DefineSection(4,253.6,74.5,264.4);
 159   dvol->DefineSection(5,260.,74.5,264.4);
 160   //
 161   TGeoMedium *m5 = gGeoManager->GetMedium("TPC_Ne-CO2-N-2");
 162   TGeoVolume *v9 = new TGeoVolume("TPC_Drift",dvol,m5);
 163   //
 164   v1->AddNode(v9,1);
 165   //
 166   // outer insulator
 167   //
 168   TGeoPcon *tpco = new TGeoPcon(0.,360.,6); //insulator
 169   //
 170   tpco->DefineSection(0,-256.6,264.8,278.);
 171   tpco->DefineSection(1,-253.6,264.8,278.);
 172   //
 173   tpco->DefineSection(2,-253.6,258.,278.);
 174   tpco->DefineSection(3,250.6,258.,278.);
 175   //
 176   tpco->DefineSection(4,250.6,258.,275.5);
 177   tpco->DefineSection(5,253.6,258.,275.5);
 178   //
 179   TGeoMedium *m2 = gGeoManager->GetMedium("TPC_CO2");
 180   TGeoVolume *v2 = new TGeoVolume("TPC_OI",tpco,m2);
 181   //
 182   // outer containment vessel
 183   //
 184   TGeoPcon *tocv = new TGeoPcon(0.,360.,6);  // containment vessel
 185   //
 186   tocv->DefineSection(0,-256.6,264.8,278.);
 187   tocv->DefineSection(1,-253.6,264.8,278.);
 188   //
 189   tocv->DefineSection(2,-253.6,274.8124,278.);
 190   tocv->DefineSection(3,247.6,274.8124,278.);
 191   //
 192   tocv->DefineSection(4,247.6,270.4,278.);
 193   tocv->DefineSection(5,250.6,270.4,278.);
 194   //
 195   TGeoMedium *m3 = gGeoManager->GetMedium("TPC_Al");
 196   TGeoVolume *v3 = new TGeoVolume("TPC_OCV",tocv,m3);
 197   //
 198   TGeoTube *to1 = new TGeoTube(274.8174,277.995,252.1); //epoxy
 199   TGeoTube *to2 = new TGeoTube(274.8274,277.985,252.1); //tedlar
 200   TGeoTube *to3 = new TGeoTube(274.8312,277.9812,252.1);//prepreg2
 201   TGeoTube *to4 = new TGeoTube(274.9062,277.9062,252.1);//nomex
 202   //
 203   TGeoMedium *sm1 = gGeoManager->GetMedium("TPC_Epoxy");
 204   TGeoMedium *sm2 = gGeoManager->GetMedium("TPC_Tedlar");
 205   TGeoMedium *sm3 = gGeoManager->GetMedium("TPC_Prepreg2");
 206   TGeoMedium *sm4 = gGeoManager->GetMedium("TPC_Nomex");
 207   //
 208   TGeoVolume *tov1 = new TGeoVolume("TPC_OCV1",to1,sm1);
 209   TGeoVolume *tov2 = new TGeoVolume("TPC_OCV2",to2,sm2);
 210   TGeoVolume *tov3 = new TGeoVolume("TPC_OCV3",to3,sm3);
 211   TGeoVolume *tov4 = new TGeoVolume("TPC_OCV4",to4,sm4);
 212
 213   //-------------------------------------------------------
 214   //  Tpc Outer Field Cage
 215   //  daughters - composite (sandwich)
 216   //-------------------------------------------------------
 217
 218   TGeoPcon *tofc = new TGeoPcon(0.,360.,6);
 219   //
 220   tofc->DefineSection(0,-253.6,258.,269.6);
 221   tofc->DefineSection(1,-250.6,258.,269.6);
 222   //
 223   tofc->DefineSection(2,-250.6,258.,260.0676);
 224   tofc->DefineSection(3,250.6,258.,260.0676);
 225   //
 226   tofc->DefineSection(4,250.6,258.,275.5);
 227   tofc->DefineSection(5,253.6,258.,275.5);
 228   //
 229   TGeoVolume *v4 = new TGeoVolume("TPC_TOFC",tofc,m3);
 230   //sandwich
 231   TGeoTube *tf1 = new TGeoTube(258.0,260.0676,252.1); //tedlar
 232   TGeoTube *tf2 = new TGeoTube(258.0038,260.0638,252.1); //prepreg3
 233   TGeoTube *tf3 = new TGeoTube(258.0338,260.0338,252.1);//nomex
 234   //
 235   TGeoMedium *sm5 = gGeoManager->GetMedium("TPC_Prepreg3");
 236   //
 237   TGeoVolume *tf1v = new TGeoVolume("TPC_OFC1",tf1,sm2);
 238   TGeoVolume *tf2v = new TGeoVolume("TPC_OFC2",tf2,sm5);
 239   TGeoVolume *tf3v = new TGeoVolume("TPC_OFC3",tf3,sm4);
 240   //
 241   // outer part - positioning
 242   //
 243   tov1->AddNode(tov2,1); tov2->AddNode(tov3,1); tov3->AddNode(tov4,1);
 244   //
 245   tf1v->AddNode(tf2v,1); tf2v->AddNode(tf3v,1);
 246   //
 247   v3->AddNode(tov1,1,new TGeoTranslation(0.,0.,-1.5)); v4->AddNode(tf1v,1);
 248   //
 249   v2->AddNode(v3,1); v2->AddNode(v4,1);
 250   //
 251   v1->AddNode(v2,1);
 252   //-----------------------------------------------------------
 253
 254
 255
 256
 257
 258
 259   //--------------------------------------------------------------------
 260   // Tpc Inner INsulator (CO2)
 261   // the cones, the central drum and the inner f.c. sandwich with a piece
 262   // of the flane will be placed in the TPC
 263   //--------------------------------------------------------------------
 264   TGeoPcon *tpci = new TGeoPcon(0.,360.,4);
 265   //
 266   tpci->DefineSection(0,-253.6,68.4,76.6774);
 267   tpci->DefineSection(1,-74.0,61.2,76.6774);
 268   //
 269   tpci->DefineSection(2,74.0,61.2,76.6774);
 270   //
 271   tpci->DefineSection(3,253.6,65.9,76.6774);
 272   //
 273   TGeoVolume *v5 = new TGeoVolume("TPC_INI",tpci,m2);
 274   //
 275   // now the inner field cage - only part of flanges (2 copies)
 276   //
 277   TGeoTube *tif1 = new TGeoTube(69.9,76.6774,1.5);
 278   TGeoVolume *v6 = new TGeoVolume("TPC_IFC1",tif1,m3);
 279   //
 280  //---------------------------------------------------------
 281   // Tpc Inner Containment vessel - Muon side
 282   //---------------------------------------------------------
 283   TGeoPcon *tcms = new TGeoPcon(0.,360.,10);
 284   //
 285   tcms->DefineSection(0,-259.1,68.1,74.2);
 286   tcms->DefineSection(1,-253.6,68.1,74.2);
 287   //
 288   tcms->DefineSection(2,-253.6,68.1,68.4);
 289   tcms->DefineSection(3,-74.0,60.9,61.2);
 290   //
 291   tcms->DefineSection(4,-74.0,60.1,61.2);
 292   tcms->DefineSection(5,-73.3,60.1,61.2);
 293   //
 294   tcms->DefineSection(6,-73.3,56.9,61.2);
 295   tcms->DefineSection(7,-73.0,56.9,61.2);
 296   //
 297   tcms->DefineSection(8,-73.0,56.9,58.8);
 298   tcms->DefineSection(9,-71.3,56.9,58.8);
 299   //
 300   TGeoVolume *v7 = new TGeoVolume("TPC_ICVM",tcms,m3);
 301   //-----------------------------------------------
 302   // inner containment vessel - shaft side
 303   //-----------------------------------------------
 304   TGeoPcon *tcss = new TGeoPcon(0.,360.,10);
 305   //
 306   tcss->DefineSection(0,71.3,56.9,58.8);
 307   tcss->DefineSection(1,73.0,56.9,58.8);
 308   //
 309   tcss->DefineSection(2,73.0,56.9,61.2);
 310   tcss->DefineSection(3,73.3,56.9,61.2);
 311   //
 312   tcss->DefineSection(4,73.3,60.1,61.2);
 313   tcss->DefineSection(5,74.0,60.1,61.2);
 314   //
 315   tcss->DefineSection(6,74.0,60.9,61.2);
 316   tcss->DefineSection(7,253.6,65.6,65.9);
 317   //
 318   tcss->DefineSection(8,253.6,65.6,74.2);
 319   tcss->DefineSection(9,258.1,65.6,74.2);
 320   //
 321   TGeoVolume *v8 = new TGeoVolume("TPC_ICVS",tcss,m3);
 322   //-----------------------------------------------
 323   //  Inner field cage
 324   //  define 4 parts and make an assembly
 325   //-----------------------------------------------
 326   // part1 - Al - 2 copies
 327   TGeoTube *t1 = new TGeoTube(76.6774,78.845,0.75);
 328   TGeoVolume *tv1 = new TGeoVolume("TPC_IFC2",t1,m3);
 329   // sandwich - outermost parts - 2 copies
 330   TGeoTube *t2 = new TGeoTube(76.6774,78.845,74.175); // tedlar 38 microns
 331   TGeoTube *t3 = new TGeoTube(76.6812,78.8412,74.175); // prepreg2 500 microns
 332   TGeoTube *t4 = new TGeoTube(76.7312,78.7912,74.175); // prepreg3 300 microns
 333   TGeoTube *t5 = new TGeoTube(76.7612,78.7612,74.175); // nomex 2 cm
 334   //
 335   TGeoVolume *tv2 = new TGeoVolume("TPC_IFC3",t2,sm2);
 336   TGeoVolume *tv3 = new TGeoVolume("TPC_IFC4",t3,sm3);
 337   TGeoVolume *tv4 = new TGeoVolume("TPC_IFC5",t4,sm5);
 338   TGeoVolume *tv5 = new TGeoVolume("TPC_IFC6",t5,sm4);
 339   //
 340   // middle parts - 2 copies
 341   TGeoTube *t6 = new TGeoTube(76.6774,78.795,5.); // tedlar 38 microns
 342   TGeoTube *t7 = new TGeoTube(76.6812,78.7912,5.); // prepreg2 250 microns
 343   TGeoTube *t8 = new TGeoTube(76.7062,78.7662,5.); // prepreg3 300 microns
 344   TGeoTube *t9 = new TGeoTube(76.7362,78.7362,5.); // nomex 2 cm
 345   //
 346   TGeoVolume *tv6 = new TGeoVolume("TPC_IFC7",t6,sm2);
 347   TGeoVolume *tv7 = new TGeoVolume("TPC_IFC8",t7,sm3);
 348   TGeoVolume *tv8 = new TGeoVolume("TPC_IFC9",t8,sm5);
 349   TGeoVolume *tv9 = new TGeoVolume("TPC_IFC10",t9,sm4);
 350   // central part - 1 copy
 351   TGeoTube *t10 = new TGeoTube(76.6774,78.745,93.75); // tedlar 38 microns
 352   TGeoTube *t11 = new TGeoTube(76.6812,78.7412,93.75); // prepreg3 300 microns
 353   TGeoTube *t12 = new TGeoTube(76.7112,78.7112,93.75); // nomex 2 cm
 354   //
 355   TGeoVolume *tv10 = new TGeoVolume("TPC_IFC11",t10,sm2);
 356   TGeoVolume *tv11 = new TGeoVolume("TPC_IFC12",t11,sm5);
 357   TGeoVolume *tv12 = new TGeoVolume("TPC_IFC13",t12,sm4);
 358   //
 359   // inner part - positioning
 360   //
 361   // creating a sandwich
 362   tv2->AddNode(tv3,1); tv3->AddNode(tv4,1); tv4->AddNode(tv5,1);
 363   //
 364   tv6->AddNode(tv7,1); tv7->AddNode(tv8,1); tv8->AddNode(tv9,1);
 365   //
 366   tv10->AddNode(tv11,1); tv11->AddNode(tv12,1);
 367   //
 368   TGeoVolumeAssembly *tv100 = new TGeoVolumeAssembly("TPC_IFC");
 369   //
 370   tv100->AddNode(tv10,1);
 371   tv100->AddNode(tv6,1,new TGeoTranslation(0.,0.,-98.75));
 372   tv100->AddNode(tv6,2,new TGeoTranslation(0.,0.,98.75));
 373   tv100->AddNode(tv2,1,new TGeoTranslation(0.,0.,-177.925));
 374   tv100->AddNode(tv2,2,new TGeoTranslation(0.,0.,177.925));
 375   tv100->AddNode(tv1,1,new TGeoTranslation(0.,0.,-252.85));
 376   tv100->AddNode(tv1,2,new TGeoTranslation(0.,0.,252.85));
 377   //
 378   v5->AddNode(v6,1, new TGeoTranslation(0.,0.,-252.1));
 379   v5->AddNode(v6,2, new TGeoTranslation(0.,0.,252.1));
 380   v1->AddNode(v5,1); v1->AddNode(v7,1); v1->AddNode(v8,1);
 381   v9->AddNode(tv100,1);
 382   //
 383   // central drum
 384   //
 385   // flange + sandwich
 386   //
 387   TGeoPcon *cfl = new TGeoPcon(0.,360.,6);
 388   cfl->DefineSection(0,-71.1,59.7,61.2);
 389   cfl->DefineSection(1,-68.6,59.7,61.2);
 390   //
 391   cfl->DefineSection(2,-68.6,60.6324,61.2);
 392   cfl->DefineSection(3,68.6,60.6324,61.2);
 393   //
 394   cfl->DefineSection(4,68.6,59.7,61.2);
 395   cfl->DefineSection(5,71.1,59.7,61.2);
 396   //
 397   TGeoVolume *cflv = new TGeoVolume("TPC_CDR",cfl,m3);
 398   // sandwich
 399   TGeoTube *cd1 = new TGeoTube(60.6424,61.19,71.1);
 400   TGeoTube *cd2 = new TGeoTube(60.6462,61.1862,71.1);
 401   TGeoTube *cd3 = new TGeoTube(60.6662,61.1662,71.1);
 402   //
 403   TGeoMedium *sm6 = gGeoManager->GetMedium("TPC_Prepreg1");
 404   TGeoVolume *cd1v = new TGeoVolume("TPC_CDR1",cd1,sm2); //tedlar
 405   TGeoVolume *cd2v = new TGeoVolume("TPC_CDR2",cd2,sm6);// prepreg1
 406   TGeoVolume *cd3v = new TGeoVolume("TPC_CDR3",cd3,sm4); //nomex
 407   //
 408   // seals for central drum 2 copies
 409   //
 410   TGeoTube *cs = new TGeoTube(56.9,61.2,0.1);
 411   TGeoMedium *sm7 = gGeoManager->GetMedium("TPC_Mylar");
 412   TGeoVolume *csv = new TGeoVolume("TPC_CDRS",cs,sm7);
 413   v1->AddNode(csv,1,new TGeoTranslation(0.,0.,-71.));
 414   v1->AddNode(csv,2,new TGeoTranslation(0.,0.,71.));
 415   //
 416   // seal collars
 417   TGeoPcon *se = new TGeoPcon(0.,360.,6);
 418   se->DefineSection(0,-72.8,59.7,61.2);
 419   se->DefineSection(1,-72.3,59.7,61.2);
 420   //
 421   se->DefineSection(2,-72.3,58.85,61.2);
 422   se->DefineSection(3,-71.6,58.85,61.2);
 423   //
 424   se->DefineSection(4,-71.6,59.7,61.2);
 425   se->DefineSection(5,-71.3,59.7,61.2);
 426   //
 427   TGeoVolume *sev = new TGeoVolume("TPC_CDCE",se,m3);
 428   //
 429   TGeoTube *si = new TGeoTube(56.9,58.8,1.);
 430   TGeoVolume *siv = new TGeoVolume("TPC_CDCI",si,m3);
 431   //
 432   // define reflection matrix
 433   //
 434   TGeoRotation *ref = new TGeoRotation("ref",90.,0.,90.,90.,180.,0.);
 435   //
 436   cd1v->AddNode(cd2v,1); cd2v->AddNode(cd3v,1); cflv->AddNode(cd1v,1);
 437   //
 438   v1->AddNode(siv,1,new TGeoTranslation(0.,0.,-70.1));
 439   v1->AddNode(siv,2,new TGeoTranslation(0.,0.,70.1));
 440   v1->AddNode(sev,1); v1->AddNode(sev,2,ref); v1->AddNode(cflv,1);
 441   //
 442   // central membrane - 2 rings and a mylar membrane - assembly
 443   //
 444   TGeoTube *ih = new TGeoTube(81.05,84.05,0.3);
 445   TGeoTube *oh = new TGeoTube(250.,256.,.5);
 446   TGeoTube *mem = new TGeoTube(84.05,250,0.01);
 447   TGeoVolume *ihv = new TGeoVolume("TPC_IHVH",ih,m3);
 448   TGeoVolume *ohv = new TGeoVolume("TPC_OHVH",oh,m3);
 449   TGeoVolume *memv = new TGeoVolume("TPC_HV",mem,sm7);
 450   //
 451   TGeoVolumeAssembly *cm = new TGeoVolumeAssembly("TPC_HVMEM");
 452   cm->AddNode(ihv,1);
 453   cm->AddNode(ohv,1);
 454   cm->AddNode(memv,1);
 455   v9->AddNode(cm,1);
 456   //
 457   // end caps - they are make as an assembly of single segments
 458   // containing both readout chambers
 459   //
 460   Double_t OpeningAngle = 10.*TMath::DegToRad();
 461   Double_t thick=1.5; // rib
 462   Double_t shift = thick/TMath::Sin(OpeningAngle);
 463   //
 464   Double_t LowEdge = 86.3; // hole in the wheel
 465   Double_t UpEdge = 240.4; // hole in the wheel
 466   //
 467   new TGeoTubeSeg("sec",74.5,264.4,3.,0.,20.);
 468   //
 469   TGeoPgon *hole = new TGeoPgon("hole",0.,20.,1,4);
 470   //
 471   hole->DefineSection(0,-3.5,LowEdge-shift,UpEdge-shift);
 472   hole->DefineSection(1,-1.5,LowEdge-shift,UpEdge-shift);
 473   //
 474   hole->DefineSection(2,-1.5,LowEdge-shift,UpEdge+3.-shift);
 475   hole->DefineSection(3,3.5,LowEdge-shift,UpEdge+3.-shift);
 476   //
 477   Double_t ys = shift*TMath::Sin(OpeningAngle);
 478   Double_t xs = shift*TMath::Cos(OpeningAngle);
 479   TGeoTranslation *tr = new TGeoTranslation("tr",xs,ys,0.);
 480   tr->RegisterYourself();
 481   TGeoCompositeShape *chamber = new TGeoCompositeShape("sec-hole:tr");
 482   TGeoVolume *sv = new TGeoVolume("TPC_WSEG",chamber,m3);
 483   TGeoPgon *bar = new TGeoPgon("bar",0.,20.,1,2);
 484   bar->DefineSection(0,-3.,131.5-shift,136.5-shift);
 485   bar->DefineSection(1,1.5,131.5-shift,136.5-shift);
 486   TGeoVolume *barv = new TGeoVolume("TPC_WBAR",bar,m3);
 487   TGeoVolumeAssembly *ch = new TGeoVolumeAssembly("TPC_WCH");//empty segment
 488   //
 489   ch->AddNode(sv,1); ch->AddNode(barv,1,tr);
 490   //
 491   // readout chambers
 492   //
 493   // IROC first
 494   //
 495    TGeoTrd1 *ibody = new TGeoTrd1(13.8742,21.3328,4.29,21.15);
 496    TGeoVolume *ibdv = new TGeoVolume("TPC_IROCB",ibody,m3);
 497   // empty space
 498    TGeoTrd1 *emp = new TGeoTrd1(12.3742,19.8328,3.99,19.65);
 499    TGeoVolume *empv = new TGeoVolume("TPC_IROCE",emp,m1);
 500    ibdv->AddNode(empv,1,new TGeoTranslation(0.,-0.3,0.));
 501    //bars
 502    Double_t tga = (19.8328-12.3742)/39.3;
 503    Double_t xmin,xmax;
 504    xmin = 9.55*tga+12.3742;
 505    xmax = 9.95*tga+12.3742;
 506    TGeoTrd1 *ib1 = new TGeoTrd1(xmin,xmax,3.29,0.2);
 507    TGeoVolume *ib1v = new TGeoVolume("TPC_IRB1",ib1,m3);
 508    empv->AddNode(ib1v,1,new TGeoTranslation("tt1",0.,0.7,-9.9));
 509    xmin=19.4*tga+12.3742;
 510    xmax=19.9*tga+12.3742;
 511    TGeoTrd1 *ib2 = new TGeoTrd1(xmin,xmax,3.29,0.25);
 512    TGeoVolume *ib2v = new TGeoVolume("TPC_TRB2",ib2,m3);
 513    empv->AddNode(ib2v,1,new TGeoTranslation(0.,0.7,0.));
 514    xmin=29.35*tga+12.3742;
 515    xmax=29.75*tga+12.3742;
 516    TGeoTrd1 *ib3 = new TGeoTrd1(xmin,xmax,3.29,0.2);
 517    TGeoVolume *ib3v = new TGeoVolume("TPC_IRB3",ib3,m3);
 518    empv->AddNode(ib3v,1,new TGeoTranslation(0.,0.7,9.9));
 519    //
 520    // holes for connectors
 521    //
 522    TGeoBBox *conn = new TGeoBBox(0.4,0.3,4.675); // identical for iroc and oroc
 523    TGeoVolume *connv = new TGeoVolume("TPC_RCCON",conn,m1);
 524    TString fileName(gSystem->Getenv("ALICE_ROOT"));
 525    fileName += "/TPC/conn_iroc.dat";
 526    ifstream in;
 527    in.open(fileName.Data(), ios_base::in); // asci file
 528    for(Int_t i =0;i<86;i++){
 529       Double_t y = 3.99;
 530       Double_t x,z,ang;
 531       in>>x>>z>>ang;
 532       z-=26.5;
 533       TGeoRotation *rrr = new TGeoRotation();
 534       rrr->RotateY(ang);
 535       TGeoCombiTrans *trans = new TGeoCombiTrans("trans",x,y,z,rrr);
 536       ibdv->AddNode(connv,i+1,trans);
 537    }
 538    in.close();
 539    // "cap"
 540    new TGeoTrd1("icap",14.5974,23.3521,1.19,24.825);
 541    // "hole"
 542    new TGeoTrd1("ihole",13.8742,21.3328,1.2,21.15);
 543    TGeoTranslation *tr1 = new TGeoTranslation("tr1",0.,0.,1.725);
 544    tr1->RegisterYourself();
 545    TGeoCompositeShape *ic = new TGeoCompositeShape("icap-ihole:tr1");
 546    TGeoVolume *icv = new TGeoVolume("TPC_IRCAP",ic,m3);
 547    //
 548    // pad plane and wire fixations
 549    //
 550    TGeoTrd1 *pp = new TGeoTrd1(14.5974,23.3521,0.3,24.825); //pad+iso
 551    TGeoMedium *m4 = gGeoManager->GetMedium("TPC_G10");
 552    TGeoVolume *ppv = new TGeoVolume("TPC_IRPP",pp,m4);
 553    TGeoPara *f1 = new TGeoPara(.6,.5,24.825,0.,-10.,0.);
 554    TGeoVolume *f1v = new TGeoVolume("TPC_IRF1",f1,m4);
 555    TGeoPara *f2 = new TGeoPara(.6,.5,24.825,0.,10.,0.);
 556    TGeoVolume *f2v = new TGeoVolume("TPC_IRF2",f2,m4);
 557    //
 558    TGeoVolumeAssembly *iroc = new TGeoVolumeAssembly("TPC_IROC");
 559    //
 560    iroc->AddNode(ibdv,1);
 561    iroc->AddNode(icv,1,new TGeoTranslation(0.,3.1,-1.725));
 562    iroc->AddNode(ppv,1,new TGeoTranslation(0.,4.59,-1.725));
 563    tga =(23.3521-14.5974)/49.65;
 564    Double_t xx = 24.825*tga+14.5974-0.6;
 565    iroc->AddNode(f1v,1,new TGeoTranslation(-xx,5.39,-1.725));
 566    iroc->AddNode(f2v,1,new TGeoTranslation(xx,5.39,-1.725));
 567    //
 568    // OROC
 569    //
 570    TGeoTrd1 *obody = new TGeoTrd1(22.2938,40.5084,4.19,51.65);
 571    TGeoVolume *obdv = new TGeoVolume("TPC_OROCB",obody,m3);
 572    TGeoTrd1 *oemp = new TGeoTrd1(20.2938,38.5084,3.89,49.65);
 573    TGeoVolume *oempv = new TGeoVolume("TPC_OROCE",oemp,m1);
 574    obdv->AddNode(oempv,1,new TGeoTranslation(0.,-0.3,0.));
 575    //horizontal bars
 576    tga=(38.5084-20.2938)/99.3;
 577    xmin=tga*10.2+20.2938;
 578    xmax=tga*10.6+20.2938;
 579    TGeoTrd1 *ob1 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 580    TGeoVolume *ob1v = new TGeoVolume("TPC_ORB1",ob1,m3);
 581    //
 582    xmin=22.55*tga+20.2938;
 583    xmax=24.15*tga+20.2938;
 584    TGeoTrd1 *ob2 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 585    TGeoVolume *ob2v = new TGeoVolume("TPC_ORB2",ob2,m3);
 586    //
 587    xmin=36.1*tga+20.2938;
 588    xmax=36.5*tga+20.2938;
 589    TGeoTrd1 *ob3 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 590    TGeoVolume *ob3v = new TGeoVolume("TPC_ORB3",ob3,m3);
 591    //
 592    xmin=49.0*tga+20.2938;
 593    xmax=50.6*tga+20.2938;
 594    TGeoTrd1 *ob4 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 595    TGeoVolume *ob4v = new TGeoVolume("TPC_ORB4",ob4,m3);
 596    //
 597    xmin=63.6*tga+20.2938;
 598    xmax=64.0*tga+20.2938;
 599    TGeoTrd1 *ob5 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 600    TGeoVolume *ob5v = new TGeoVolume("TPC_ORB5",ob5,m3);
 601    //
 602    xmin=75.5*tga+20.2938;
 603    xmax=77.15*tga+20.2938;
 604    TGeoTrd1 *ob6 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 605    TGeoVolume *ob6v = new TGeoVolume("TPC_ORB6",ob6,m3);
 606    //
 607    xmin=88.7*tga+20.2938;
 608    xmax=89.1*tga+20.2938;
 609    TGeoTrd1 *ob7 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 610    TGeoVolume *ob7v = new TGeoVolume("TPC_ORB7",ob7,m3);
 611    //
 612    oempv->AddNode(ob1v,1,new TGeoTranslation(0.,0.975,-39.25));
 613    oempv->AddNode(ob2v,1,new TGeoTranslation(0.,0.975,-26.3));
 614    oempv->AddNode(ob3v,1,new TGeoTranslation(0.,0.975,-13.35));
 615    oempv->AddNode(ob4v,1,new TGeoTranslation(0.,0.975,0.15));
 616    oempv->AddNode(ob5v,1,new TGeoTranslation(0.,0.975,14.15));
 617    oempv->AddNode(ob6v,1,new TGeoTranslation(0.,0.975,26.7));
 618    oempv->AddNode(ob7v,1,new TGeoTranslation(0.,0.975,39.25));
 619    // vertical bars
 620    TGeoBBox *ob8 = new TGeoBBox(0.8,2.915,5.1);
 621    TGeoBBox *ob9 = new TGeoBBox(0.8,2.915,5.975);
 622    TGeoBBox *ob10 = new TGeoBBox(0.8,2.915,5.775);
 623    TGeoBBox *ob11 = new TGeoBBox(0.8,2.915,6.25);
 624    TGeoBBox *ob12 = new TGeoBBox(0.8,2.915,6.5);
 625    //
 626    TGeoVolume *ob8v = new TGeoVolume("TPC_ORB8",ob8,m3);
 627    TGeoVolume *ob9v = new TGeoVolume("TPC_ORB9",ob9,m3);
 628    TGeoVolume *ob10v = new TGeoVolume("TPC_ORB10",ob10,m3);
 629    TGeoVolume *ob11v = new TGeoVolume("TPC_ORB11",ob11,m3);
 630    TGeoVolume *ob12v = new TGeoVolume("TPC_ORB12",ob12,m3);
 631    //
 632    oempv->AddNode(ob8v,1,new TGeoTranslation(0.,0.975,-44.55));
 633    oempv->AddNode(ob8v,2,new TGeoTranslation(0.,0.975,44.55));
 634    oempv->AddNode(ob9v,1,new TGeoTranslation(0.,0.975,-33.075));
 635    oempv->AddNode(ob9v,2,new TGeoTranslation(0.,0.975,-19.525));
 636    oempv->AddNode(ob10v,1,new TGeoTranslation(0.,0.975,20.125));
 637    oempv->AddNode(ob10v,2,new TGeoTranslation(0.,0.975,33.275));
 638    oempv->AddNode(ob11v,1,new TGeoTranslation(0.,0.975,-6.9));
 639    oempv->AddNode(ob12v,1,new TGeoTranslation(0.,0.975,7.45));
 640    //
 641    // holes for connectors
 642    //
 643    fileName = gSystem->Getenv("ALICE_ROOT");
 644    fileName += "/TPC/conn_oroc.dat";
 645    in.open(fileName.Data(), ios_base::in); // asci file
 646    for(Int_t i =0;i<78;i++){
 647       Double_t y =3.89;
 648       Double_t x,z,ang;
 649       Double_t x1,z1,x2,z2;
 650       in>>x>>z>>ang;
 651       Double_t xr = 4.7*TMath::Sin(ang*TMath::DegToRad());
 652       Double_t zr = 4.7*TMath::Cos(ang*TMath::DegToRad());
 653       //
 654       x1=xr+x; x2=-xr+x; z1=zr+z; z2 = -zr+z;
 655       //
 656       TGeoRotation *rr = new TGeoRotation();
 657       rr->RotateY(ang);
 658       z1-=54.95;
 659       z2-=54.95;
 660       TGeoCombiTrans *trans1 = new TGeoCombiTrans("trans1",x1,y,z1,rr);
 661       TGeoCombiTrans *trans2 = new TGeoCombiTrans("trans2",x2,y,z2,rr);
 662       obdv->AddNode(connv,i+1,trans1);
 663       obdv->AddNode(connv,i+79,trans2);
 664    }
 665    in.close();
 666    // cap
 667    new TGeoTrd1("ocap",23.3874,43.5239,1.09,57.1);
 668    new TGeoTrd1("ohole",22.2938,40.5084,1.09,51.65);
 669    TGeoTranslation *tr5 = new TGeoTranslation("tr5",0.,0.,-2.15);
 670    tr5->RegisterYourself();
 671    TGeoCompositeShape *oc = new TGeoCompositeShape("ocap-ohole:tr5");
 672    TGeoVolume *ocv = new TGeoVolume("TPC_ORCAP",oc,m3);
 673    //
 674    // pad plane and wire fixations
 675    //
 676    TGeoTrd1 *opp = new TGeoTrd1(23.3874,43.5239,0.3,57.1);
 677    TGeoVolume *oppv = new TGeoVolume("TPC_ORPP",opp,m4);
 678    //
 679    tga=(43.5239-23.3874)/114.2;
 680    TGeoPara *f3 = new TGeoPara(.7,.6,57.1,0.,-10.,0.);
 681    TGeoPara *f4 = new TGeoPara(.7,.6,57.1,0.,10.,0.);
 682    xx = 57.1*tga+23.3874-0.7;
 683    TGeoVolume *f3v = new TGeoVolume("TPC_ORF1",f3,m4);
 684    TGeoVolume *f4v = new TGeoVolume("TPC_ORF2",f4,m4);
 685    //
 686    TGeoVolumeAssembly *oroc = new TGeoVolumeAssembly("TPC_OROC");
 687    //
 688    oroc->AddNode(obdv,1);
 689    oroc->AddNode(ocv,1,new TGeoTranslation(0.,3.1,2.15));
 690    oroc->AddNode(oppv,1,new TGeoTranslation(0.,4.49,2.15));
 691    oroc->AddNode(f3v,1,new TGeoTranslation(-xx,5.39,2.15));
 692    oroc->AddNode(f4v,1,new TGeoTranslation(xx,5.39,2.15));
 693    //
 694    // now iroc and oroc are placed into a sector...
 695    //
 696    TGeoVolumeAssembly *sect = new TGeoVolumeAssembly("TPC_SECT");
 697    TGeoRotation rot1("rot1",90.,90.,0.);
 698    TGeoRotation rot2("rot2");
 699    rot2.RotateY(10.);
 700    TGeoRotation *rot = new TGeoRotation("rot");
 701    *rot=rot1*rot2;
 702    //
 703    Double_t x0,y0;
 704    x0=110.2*TMath::Cos(OpeningAngle);
 705    y0=110.2*TMath::Sin(OpeningAngle);
 706    TGeoCombiTrans *combi1 = new TGeoCombiTrans("combi1",x0,y0,1.09,rot);
 707    x0=188.45*TMath::Cos(OpeningAngle);
 708    y0=188.45*TMath::Sin(OpeningAngle);
 709    TGeoCombiTrans *combi2 = new TGeoCombiTrans("combi2",x0,y0,0.99,rot);
 710    //
 711    sect->AddNode(ch,1);
 712    sect->AddNode(iroc,1,combi1);
 713    sect->AddNode(oroc,1,combi2);
 714    //
 715    // segment is ready...
 716    // now I try to make a wheel...
 717    //
 718    TGeoVolumeAssembly *wheel = new TGeoVolumeAssembly("TPC_ENDCAP");
 719    //
 720    for(Int_t i =0;i<18;i++){
 721      Double_t phi = (20.*i);
 722      TGeoRotation *r = new TGeoRotation();
 723      r->RotateZ(phi);
 724      wheel->AddNode(sect,i+1,r);
 725
 726    }
 727    // wheels in the drift volume!
 728    TGeoCombiTrans *combi3 = new TGeoCombiTrans("combi3",0.,0.,256.6,ref);
 729    v9->AddNode(wheel,1,combi3);
 730    v9->AddNode(wheel,2,new TGeoTranslation(0.,0.,-256.6));
 731
 732    //_____________________________________________________________
 733    // service support wheel
 734    //_____________________________________________________________
 735   TGeoPgon *sw = new TGeoPgon(0.,20.,1,2);
 736   sw->DefineSection(0,-4.,80.5,251.75);
 737   sw->DefineSection(1,4.,80.5,251.75);
 738   TGeoVolume *swv = new TGeoVolume("TPC_SWSEG",sw,m3); //Al
 739   //
 740   thick=1.;
 741   shift = thick/TMath::Sin(OpeningAngle);
 742   TGeoPgon *sh = new TGeoPgon(0.,20.,1,2);
 743   sh->DefineSection(0,-4.,81.5-shift,250.75-shift);
 744   sh->DefineSection(1,4.,81.5-shift,250.75-shift);
 745   TGeoVolume *shv = new TGeoVolume("TPC_SWS1",sh,m1); //Air
 746   //
 747   TGeoMedium *m9 =  gGeoManager->GetMedium("TPC_Si");
 748   TGeoPgon *el = new TGeoPgon(0.,20.,1,2);
 749   el->DefineSection(0,-1.872,81.5-shift,250.75-shift);
 750   el->DefineSection(1,1.872,81.5-shift,250.75-shift);
 751   TGeoVolume *elv = new TGeoVolume("TPC_ELEC",el,m9); //Si
 752   //
 753   shv->AddNode(elv,1);
 754   //
 755   ys = shift*TMath::Sin(OpeningAngle);
 756   xs = shift*TMath::Cos(OpeningAngle);
 757   swv->AddNode(shv,1,new TGeoTranslation(xs,ys,0.));
 758   // cover
 759   TGeoPgon *co = new TGeoPgon(0.,20.,1,2);
 760   co->DefineSection(0,-0.5,77.,255.25);
 761   co->DefineSection(1,0.5,77.,255.25);
 762   TGeoVolume *cov = new TGeoVolume("TPC_SWC1",co,m3);//Al
 763   // hole in a cover
 764   TGeoPgon *coh = new TGeoPgon(0.,20.,1,2);
 765   shift=4./TMath::Sin(OpeningAngle);
 766   coh->DefineSection(0,-0.5,85.-shift,247.25-shift);
 767   coh->DefineSection(1,0.5,85.-shift,247.25-shift);
 768   //
 769   TGeoVolume *cohv = new TGeoVolume("TPC_SWC2",coh,m1);
 770   //
 771   ys = shift*TMath::Sin(OpeningAngle);
 772   xs = shift*TMath::Cos(OpeningAngle);
 773   cov->AddNode(cohv,1,new TGeoTranslation(xs,ys,0.));
 774   //
 775   // Sector as an Assembly
 776   //
 777   TGeoVolumeAssembly *swhs = new TGeoVolumeAssembly("TPC_SSWSEC");
 778   swhs->AddNode(swv,1);
 779   swhs->AddNode(cov,1,new TGeoTranslation(0.,0.,-4.5));
 780   swhs->AddNode(cov,2,new TGeoTranslation(0.,0.,4.5));
 781   //
 782   // SSW as an Assembly of sectors
 783   //
 784  TGeoVolumeAssembly *swheel = new TGeoVolumeAssembly("TPC_SSWHEEL");
 785    for(Int_t i =0;i<18;i++){
 786      Double_t phi = (20.*i);
 787      TGeoRotation *r = new TGeoRotation();
 788      r->RotateZ(phi);
 789      swheel->AddNode(swhs,i+1,r);
 790    }
 791    v1->AddNode(swheel,1,new TGeoTranslation(0.,0.,-284.6));
 792    v1->AddNode(swheel,2,new TGeoTranslation(0.,0.,284.6));
 793    //
 794   //----------------------------------------------------------
 795   // TPc Support Rods - MAKROLON
 796   //----------------------------------------------------------
 797   TGeoMedium *m6=gGeoManager->GetMedium("TPC_Makrolon");
 798   TGeoMedium *m7=gGeoManager->GetMedium("TPC_Cu");
 799   // upper and lower rods differ in length!
 800   Double_t *upar;
 801   upar=NULL;
 802   gGeoManager->Volume("TPC_Rod","TUBE",m6->GetId(),upar);
 803   upar=new Double_t [3];
 804   upar[0]=1.8;
 805   upar[1]=2.2;
 806
 807   //
 808   //HV rods - makrolon + 0.58cm (diameter) Cu
 809   TGeoTube *hvr = new TGeoTube(0.,2.2,126.64);
 810   TGeoTube *hvc = new TGeoTube(0.,0.29,126.64);
 811   //
 812   TGeoVolume *hvrv = new TGeoVolume("TPC_HV_Rod",hvr,m6);
 813   TGeoVolume *hvcv = new TGeoVolume("TPC_HV_Cable",hvc,m7);
 814   hvrv->AddNode(hvcv,1);
 815   for(Int_t i=0;i<18;i++){
 816     Double_t angle,x,y;
 817     Double_t z,r;
 818     angle=TMath::DegToRad()*20.*(Double_t)i;
 819     r=81.5;
 820     x=r * TMath::Cos(angle);
 821     y=r * TMath::Sin(angle);
 822     upar[2]=126.64; //lower
 823     z= 126.96;
 824     if(i==15){
 825       v9->AddNode(hvrv,1,new TGeoTranslation(x,y,z));
 826       v9->AddNode(hvrv,2,new TGeoTranslation(x,y,-z));
 827     }
 828     else{
 829      gGeoManager->Node("TPC_Rod",i+1,"TPC_Drift",x,y,z,0,kTRUE,upar,3);//shaft
 830      gGeoManager->Node("TPC_Rod",i+18,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);//muon
 831     }
 832     r=254.25;
 833     x=r * TMath::Cos(angle);
 834     y=r * TMath::Sin(angle);
 835     upar[2]=126.54; //upper
 836     z=127.06;
 837     gGeoManager->Node("TPC_Rod",i+36,"TPC_Drift",x,y,z,0,kTRUE,upar,3);
 838     gGeoManager->Node("TPC_Rod",i+54,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
 839   }
 840
 841   TGeoVolume *alice = gGeoManager->GetVolume("ALIC");
 842   alice->AddNode(v1,1);
 843
 844
 845
 846 } // end of function
 847
 848 //_____________________________________________________________________________
 849 void AliTPCv3::DrawDetector()
 850 {
 851   //
 852   // Draw a shaded view of the Time Projection Chamber version 3
 853   //
 854
 855
 856   // Set everything unseen
 857   gMC->Gsatt("*", "seen", -1);
 858   //
 859   // Set ALIC mother transparent
 860   gMC->Gsatt("ALIC","SEEN",0);
 861   //
 862   // Set the volumes visible
 863   //
 864
 865   gMC->Gsatt("TPC ","SEEN",0);
 866   gMC->Gsatt("TOIN","SEEN",1);
 867   gMC->Gsatt("TOIN","COLO",7);
 868   gMC->Gsatt("TOCV","SEEN",1);
 869   gMC->Gsatt("TOCV","COLO",4);
 870   gMC->Gsatt("TSA1","SEEN",0);
 871   gMC->Gsatt("TSA2","SEEN",0);
 872   gMC->Gsatt("TSA3","SEEN",0);
 873   gMC->Gsatt("TSA4","SEEN",0);
 874   gMC->Gsatt("TSA5","SEEN",0);
 875   gMC->Gsatt("TOFC","SEEN",1);
 876   gMC->Gsatt("TOFC","COLO",4);
 877   gMC->Gsatt("TSA6","SEEN",0);
 878   gMC->Gsatt("TSA7","SEEN",0);
 879   gMC->Gsatt("TSA8","SEEN",0);
 880   gMC->Gsatt("TIIN","SEEN",1);
 881   gMC->Gsatt("TIIN","COLO",7);
 882   gMC->Gsatt("TII1","SEEN",0);
 883   gMC->Gsatt("TIFC","SEEN",1);
 884   gMC->Gsatt("TIFC","COLO",4);
 885   gMC->Gsatt("TSA9","SEEN",0);
 886   gMC->Gsatt("TS10","SEEN",0);
 887   gMC->Gsatt("TS11","SEEN",0);
 888   gMC->Gsatt("TS12","SEEN",0);
 889   gMC->Gsatt("TS13","SEEN",0);
 890   gMC->Gsatt("TS14","SEEN",0);
 891   gMC->Gsatt("TICC","SEEN",0);
 892   gMC->Gsatt("TICM","SEEN",0);
 893   gMC->Gsatt("TS15","SEEN",0);
 894   gMC->Gsatt("TS16","SEEN",0);
 895   gMC->Gsatt("TS17","SEEN",0);
 896   gMC->Gsatt("TS18","SEEN",0);
 897   gMC->Gsatt("TS19","SEEN",0);
 898   gMC->Gsatt("TPJ1","SEEN",0);
 899   gMC->Gsatt("TPJ2","SEEN",0);
 900   gMC->Gsatt("TICS","SEEN",0);
 901   gMC->Gsatt("TDGS","SEEN",0);
 902   gMC->Gsatt("TIRC","SEEN",0);
 903   gMC->Gsatt("TIC1","SEEN",1);
 904   gMC->Gsatt("TIPP","SEEN",0);
 905   gMC->Gsatt("TIC3","SEEN",0);
 906   gMC->Gsatt("TRCE","SEEN",0);
 907   gMC->Gsatt("TPSC","SEEN",0);
 908   gMC->Gsatt("TPCC","SEEN",0);
 909   gMC->Gsatt("TORC","SEEN",0);
 910   gMC->Gsatt("TOPP","SEEN",0);
 911   gMC->Gsatt("TOC3","SEEN",0);
 912   gMC->Gsatt("TOC1","SEEN",1);
 913   gMC->Gsatt("TSSW","SEEN",1);
 914   gMC->Gsatt("TSWC","SEEN",1);
 915   gMC->Gsatt("TSSW","COLO",3);
 916   gMC->Gsatt("TSWC","COLO",3);
 917   gMC->Gsatt("TSCE","COLO",6);
 918   gMC->Gsatt("TSCE","SEEN",1);
 919   gMC->Gsatt("TWES","SEEN",0);
 920   gMC->Gsatt("TSWB","SEEN",0);
 921   gMC->Gsatt("TPEL","SEEN",0);
 922   gMC->Gsatt("TPMW","SEEN",1);
 923   gMC->Gsatt("TESR","SEEN",1);
 924   gMC->Gsatt("TPMW","COLO",12);
 925   gMC->Gsatt("TIC1","COLO",5);
 926   gMC->Gsatt("TOC1","COLO",5);
 927   gMC->Gsatt("TESB","SEEN",0);
 928   gMC->Gsatt("THVM","SEEN",1);
 929   gMC->Gsatt("THVM","COLO",11);
 930   gMC->Gsatt("THVH","SEEN",0);
 931   gMC->Gsatt("TPSR","SEEN",0);
 932   gMC->Gsatt("THVL","SEEN",0);
 933   gMC->Gsatt("THVC","SEEN",0);
 934   gMC->Gsatt("THVE","SEEN",0);
 935   gMC->Gsatt("THVR","SEEN",0);
 936
 937   //
 938   gMC->Gdopt("hide", "on");
 939   gMC->Gdopt("shad", "on");
 940   gMC->Gsatt("*", "fill", 7);
 941   gMC->SetClipBox(".");
 942   gMC->SetClipBox("TPMW",-300,300,-300,300,254.,270.);
 943   gMC->SetClipBox("TESR",-300,300,-300,300,254.,270.);
 944   gMC->SetClipBox("TSSW",-300,300,-300,300,283.,284.);
 945   gMC->SetClipBox("TSWC",-300,300,-300,300,283.,284.);
 946   gMC->SetClipBox("*", 0, 300, -300, 300, -290, 290);
 947   gMC->DefaultRange();
 948   gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025);
 949   gMC->Gdhead(1111, "Time Projection Chamber");
 950   gMC->Gdman(18, 4, "MAN");
 951   gMC->Gdopt("hide","off");
 952 }
 953
 954 //_____________________________________________________________________________
 955 void AliTPCv3::CreateMaterials()
 956 {
 957   //
 958   // Define materials for version 2 of the Time Projection Chamber
 959   //
 960
 961
 962   //
 963   AliTPC::CreateMaterials();
 964 }
 965
 966 //_____________________________________________________________________________
 967 void AliTPCv3::Init()
 968 {
 969   //
 970   // Initialises version 3 of the TPC after that it has been built
 971   //
 972   Int_t *idtmed = fIdtmed->GetArray();
 973
 974   AliTPC::Init();
 975
 976    fIdSens=gMC->VolId("TPC_Drift"); // drift gas as a sensitive volume
 977
 978   gMC->SetMaxNStep(30000); // max. number of steps increased
 979
 980   gMC->Gstpar(idtmed[2],"LOSS",5);
 981
 982   printf("%s: *** TPC version 3 initialized***\n",ClassName());
 983
 984   printf("%s: Maximum number of steps = %d\n",ClassName(),gMC->GetMaxNStep());
 985
 986   // printf("*** TPC version 3 initialized ***\n");
 987   // printf("Maximum number of steps = %d\n",gMC->GetMaxNStep());
 988
 989   //
 990
 991 }
 992
 993 //_____________________________________________________________________________
 994 void AliTPCv3::StepManager()
 995 {
 996   //
 997   // Called for every step in the Time Projection Chamber
 998   //
 999
1000   //
1001   // parameters used for the energy loss calculations
1002   //
1003   const Float_t kprim = 14.35; // number of primary collisions per 1 cm
1004   const Float_t kpoti = 20.77e-9; // first ionization potential for Ne/CO2
1005   const Float_t kwIon = 35.97e-9; // energy for the ion-electron pair creation
1006
1007
1008   const Float_t kbig = 1.e10;
1009
1010   Int_t id,copy;
1011   TLorentzVector pos;
1012   Float_t hits[5];
1013   Int_t vol[2];
1014
1015   vol[1]=0;
1016   vol[0]=0;
1017
1018   //
1019
1020   gMC->SetMaxStep(kbig);
1021
1022   if(!gMC->IsTrackAlive()) return; // particle has disappeared
1023
1024   Float_t charge = gMC->TrackCharge();
1025
1026   if(TMath::Abs(charge)<=0.) return; // take only charged particles
1027
1028
1029   id=gMC->CurrentVolID(copy);
1030
1031
1032   if (id != fIdSens) return;
1033
1034   //
1035   //  charged particle is in the sensitive volume
1036   //
1037
1038   if(gMC->TrackStep() > 0) {
1039
1040
1041     Int_t nel = (Int_t)(((gMC->Edep())-kpoti)/kwIon) + 1;
1042     nel=TMath::Min(nel,300); // 300 electrons corresponds to 10 keV
1043
1044     gMC->TrackPosition(pos);
1045     hits[0]=pos[0];
1046     hits[1]=pos[1];
1047     hits[2]=pos[2];
1048
1049     // Get also the track time for pileup simulation
1050     hits[4]=gMC->TrackTime();
1051
1052     //
1053     // check the selected side of the TPC
1054     //
1055
1056     if(fSide && fSide*hits[2]<=0.) return;
1057
1058     hits[3]=(Float_t)nel;
1059
1060     // Add this hit
1061
1062     AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits);  //MI change
1063
1064   }
1065
1066   // Stemax calculation for the next step
1067
1068   Float_t pp;
1069   TLorentzVector mom;
1070   gMC->TrackMomentum(mom);
1071   Float_t ptot=mom.Rho();
1072   Float_t betaGamma = ptot/gMC->TrackMass();
1073
1074   Int_t pid=gMC->TrackPid();
1075   if((pid==kElectron || pid==kPositron) && ptot > 0.002)
1076     {
1077       pp = kprim*1.58; // electrons above 20 MeV/c are on the plateau!
1078     }
1079   else
1080     {
1081       betaGamma = TMath::Max(betaGamma,(Float_t)7.e-3);
1082       pp=kprim*BetheBloch(betaGamma);
1083       if(TMath::Abs(charge) > 1.) pp *= (charge*charge);
1084     }
1085
1086   Double_t rnd = gMC->GetRandom()->Rndm();
1087
1088   gMC->SetMaxStep(-TMath::Log(rnd)/pp);
1089
1090 }
1091
1092 //_____________________________________________________________________________
1093 Float_t AliTPCv3::BetheBloch(Float_t bg)
1094 {
1095   //
1096   // Bethe-Bloch energy loss formula
1097   //
1098   const Double_t kp1=0.76176e-1;
1099   const Double_t kp2=10.632;
1100   const Double_t kp3=0.13279e-4;
1101   const Double_t kp4=1.8631;
1102   const Double_t kp5=1.9479;
1103
1104   Double_t dbg = (Double_t) bg;
1105
1106   Double_t beta = dbg/TMath::Sqrt(1.+dbg*dbg);
1107
1108   Double_t aa = TMath::Power(beta,kp4);
1109   Double_t bb = TMath::Power(1./dbg,kp5);
1110
1111   bb=TMath::Log(kp3+bb);
1112
1113   return ((Float_t)((kp2-aa-bb)*kp1/aa));
1114 }