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():AliTPC(),fIdSens(0)
  63 {
  64
  65   fHitType = 1;
  66
  67 }
  68
  69 //_____________________________________________________________________________
  70 AliTPCv3::AliTPCv3(const char *name, const char *title) :
  71   AliTPC(name, title), fIdSens(0)
  72 {
  73   //
  74   // Standard constructor for Time Projection Chamber version 3
  75   //
  76
  77   SetBufferSize(128000);
  78
  79   if (fTPCParam)
  80      fTPCParam->Write(fTPCParam->GetTitle());
  81
  82   fHitType =1;
  83 }
  84
  85 //_____________________________________________________________________________
  86 void AliTPCv3::CreateGeometry()
  87 {
  88   //
  89   // Creation of the TPC coarse geometry (version 3)
  90   // The whole drift volume is sensitive
  91   // Origin Marek Kowalski Cracow
  92   //
  93   //Begin_Html
  94   /*
  95     <img src="picts/AliTPCgif">
  96   */
  97   //End_Html
  98   //Begin_Html
  99   /*
 100     <img src="picts/AliTPCv3Tree.gif">
 101   */
 102   //End_Html
 103    //----------------------------------------------------------
 104   // This geometry is written using TGeo class
 105   // Firstly the shapes are defined, and only then the volumes
 106   // What is recognized by the MC are volumes
 107   //----------------------------------------------------------
 108   //
 109   //  tpc - this will be the mother volume
 110   //
 111
 112   //
 113   // here I define a volume TPC
 114   // retrive the medium name with "TPC_" as a leading string
 115   //
 116   TGeoPcon *tpc = new TGeoPcon(0.,360.,20); //20 sections
 117   //
 118   tpc->DefineSection(0,-291.,77.,278.);
 119   tpc->DefineSection(1,-270,77.,278.);
 120   //
 121   tpc->DefineSection(2,-270.,77.,278.);
 122   tpc->DefineSection(3,-259.6,70.,278.);
 123   //
 124   tpc->DefineSection(4,-259.6,68.1,278.);
 125   tpc->DefineSection(5,-253.6,68.1,278.);
 126   //
 127   tpc->DefineSection(6,-253.6,68.,278.);
 128   tpc->DefineSection(7,-74.0,60.8,278.);
 129   //
 130   tpc->DefineSection(8,-74.0,60.1,278.);
 131   tpc->DefineSection(9,-73.3,60.1,278.);
 132   //
 133   tpc->DefineSection(10,-73.3,56.9,278.);
 134   tpc->DefineSection(11,73.3,56.9,278.);
 135   //
 136   tpc->DefineSection(12,73.3,60.1,278.);
 137   tpc->DefineSection(13,74.0,60.1,278.);
 138   //
 139   tpc->DefineSection(14,74.0,60.8,278.);
 140   tpc->DefineSection(15,253.6,65.5,278.);
 141   //
 142   tpc->DefineSection(16,253.6,65.6,278.);
 143   tpc->DefineSection(17,259.6,65.6,278.);
 144   //
 145   tpc->DefineSection(18,259.6,70.0,278.);
 146   tpc->DefineSection(19,291.,77.,278.);
 147   //
 148   TGeoMedium *m1 = gGeoManager->GetMedium("TPC_Air");
 149   TGeoVolume *v1 = new TGeoVolume("TPC_M",tpc,m1);
 150   //
 151   // drift volume - sensitive volume, extended beyond the
 152   // endcaps, because of the alignment
 153   //
 154   TGeoPcon *dvol = new TGeoPcon(0.,360.,6);
 155   dvol->DefineSection(0,-260.,74.5,264.4);
 156   dvol->DefineSection(1,-253.6,74.5,264.4);
 157   //
 158   dvol->DefineSection(2,-253.6,76.6774,258.);
 159   dvol->DefineSection(3,253.6,76.6774,258.);
 160   //
 161   dvol->DefineSection(4,253.6,74.5,264.4);
 162   dvol->DefineSection(5,260.,74.5,264.4);
 163   //
 164   TGeoMedium *m5 = gGeoManager->GetMedium("TPC_Ne-CO2-N-2");
 165   TGeoVolume *v9 = new TGeoVolume("TPC_Drift",dvol,m5);
 166   //
 167   v1->AddNode(v9,1);
 168   //
 169   // outer insulator
 170   //
 171   TGeoPcon *tpco = new TGeoPcon(0.,360.,6); //insulator
 172   //
 173   tpco->DefineSection(0,-256.6,264.8,278.);
 174   tpco->DefineSection(1,-253.6,264.8,278.);
 175   //
 176   tpco->DefineSection(2,-253.6,258.,278.);
 177   tpco->DefineSection(3,250.6,258.,278.);
 178   //
 179   tpco->DefineSection(4,250.6,258.,275.5);
 180   tpco->DefineSection(5,253.6,258.,275.5);
 181   //
 182   TGeoMedium *m2 = gGeoManager->GetMedium("TPC_CO2");
 183   TGeoVolume *v2 = new TGeoVolume("TPC_OI",tpco,m2);
 184   //
 185   // outer containment vessel
 186   //
 187   TGeoPcon *tocv = new TGeoPcon(0.,360.,6);  // containment vessel
 188   //
 189   tocv->DefineSection(0,-256.6,264.8,278.);
 190   tocv->DefineSection(1,-253.6,264.8,278.);
 191   //
 192   tocv->DefineSection(2,-253.6,274.8124,278.);
 193   tocv->DefineSection(3,247.6,274.8124,278.);
 194   //
 195   tocv->DefineSection(4,247.6,270.4,278.);
 196   tocv->DefineSection(5,250.6,270.4,278.);
 197   //
 198   TGeoMedium *m3 = gGeoManager->GetMedium("TPC_Al");
 199   TGeoVolume *v3 = new TGeoVolume("TPC_OCV",tocv,m3);
 200   //
 201   TGeoTube *to1 = new TGeoTube(274.8174,277.995,252.1); //epoxy
 202   TGeoTube *to2 = new TGeoTube(274.8274,277.985,252.1); //tedlar
 203   TGeoTube *to3 = new TGeoTube(274.8312,277.9812,252.1);//prepreg2
 204   TGeoTube *to4 = new TGeoTube(274.9062,277.9062,252.1);//nomex
 205   //
 206   TGeoMedium *sm1 = gGeoManager->GetMedium("TPC_Epoxy");
 207   TGeoMedium *sm2 = gGeoManager->GetMedium("TPC_Tedlar");
 208   TGeoMedium *sm3 = gGeoManager->GetMedium("TPC_Prepreg2");
 209   TGeoMedium *sm4 = gGeoManager->GetMedium("TPC_Nomex");
 210   //
 211   TGeoVolume *tov1 = new TGeoVolume("TPC_OCV1",to1,sm1);
 212   TGeoVolume *tov2 = new TGeoVolume("TPC_OCV2",to2,sm2);
 213   TGeoVolume *tov3 = new TGeoVolume("TPC_OCV3",to3,sm3);
 214   TGeoVolume *tov4 = new TGeoVolume("TPC_OCV4",to4,sm4);
 215
 216   //-------------------------------------------------------
 217   //  Tpc Outer Field Cage
 218   //  daughters - composite (sandwich)
 219   //-------------------------------------------------------
 220
 221   TGeoPcon *tofc = new TGeoPcon(0.,360.,6);
 222   //
 223   tofc->DefineSection(0,-253.6,258.,269.6);
 224   tofc->DefineSection(1,-250.6,258.,269.6);
 225   //
 226   tofc->DefineSection(2,-250.6,258.,260.0676);
 227   tofc->DefineSection(3,250.6,258.,260.0676);
 228   //
 229   tofc->DefineSection(4,250.6,258.,275.5);
 230   tofc->DefineSection(5,253.6,258.,275.5);
 231   //
 232   TGeoVolume *v4 = new TGeoVolume("TPC_TOFC",tofc,m3);
 233   //sandwich
 234   TGeoTube *tf1 = new TGeoTube(258.0,260.0676,252.1); //tedlar
 235   TGeoTube *tf2 = new TGeoTube(258.0038,260.0638,252.1); //prepreg3
 236   TGeoTube *tf3 = new TGeoTube(258.0338,260.0338,252.1);//nomex
 237   //
 238   TGeoMedium *sm5 = gGeoManager->GetMedium("TPC_Prepreg3");
 239   //
 240   TGeoVolume *tf1v = new TGeoVolume("TPC_OFC1",tf1,sm2);
 241   TGeoVolume *tf2v = new TGeoVolume("TPC_OFC2",tf2,sm5);
 242   TGeoVolume *tf3v = new TGeoVolume("TPC_OFC3",tf3,sm4);
 243   //
 244   // outer part - positioning
 245   //
 246   tov1->AddNode(tov2,1); tov2->AddNode(tov3,1); tov3->AddNode(tov4,1);
 247   //
 248   tf1v->AddNode(tf2v,1); tf2v->AddNode(tf3v,1);
 249   //
 250   v3->AddNode(tov1,1,new TGeoTranslation(0.,0.,-1.5)); v4->AddNode(tf1v,1);
 251   //
 252   v2->AddNode(v3,1); v2->AddNode(v4,1);
 253   //
 254   v1->AddNode(v2,1);
 255   //-----------------------------------------------------------
 256
 257
 258
 259
 260
 261
 262   //--------------------------------------------------------------------
 263   // Tpc Inner INsulator (CO2)
 264   // the cones, the central drum and the inner f.c. sandwich with a piece
 265   // of the flane will be placed in the TPC
 266   //--------------------------------------------------------------------
 267   TGeoPcon *tpci = new TGeoPcon(0.,360.,4);
 268   //
 269   tpci->DefineSection(0,-253.6,68.4,76.6774);
 270   tpci->DefineSection(1,-74.0,61.2,76.6774);
 271   //
 272   tpci->DefineSection(2,74.0,61.2,76.6774);
 273   //
 274   tpci->DefineSection(3,253.6,65.9,76.6774);
 275   //
 276   TGeoVolume *v5 = new TGeoVolume("TPC_INI",tpci,m2);
 277   //
 278   // now the inner field cage - only part of flanges (2 copies)
 279   //
 280   TGeoTube *tif1 = new TGeoTube(69.9,76.6774,1.5);
 281   TGeoVolume *v6 = new TGeoVolume("TPC_IFC1",tif1,m3);
 282   //
 283  //---------------------------------------------------------
 284   // Tpc Inner Containment vessel - Muon side
 285   //---------------------------------------------------------
 286   TGeoPcon *tcms = new TGeoPcon(0.,360.,10);
 287   //
 288   tcms->DefineSection(0,-259.1,68.1,74.2);
 289   tcms->DefineSection(1,-253.6,68.1,74.2);
 290   //
 291   tcms->DefineSection(2,-253.6,68.1,68.4);
 292   tcms->DefineSection(3,-74.0,60.9,61.2);
 293   //
 294   tcms->DefineSection(4,-74.0,60.1,61.2);
 295   tcms->DefineSection(5,-73.3,60.1,61.2);
 296   //
 297   tcms->DefineSection(6,-73.3,56.9,61.2);
 298   tcms->DefineSection(7,-73.0,56.9,61.2);
 299   //
 300   tcms->DefineSection(8,-73.0,56.9,58.8);
 301   tcms->DefineSection(9,-71.3,56.9,58.8);
 302   //
 303   TGeoVolume *v7 = new TGeoVolume("TPC_ICVM",tcms,m3);
 304   //-----------------------------------------------
 305   // inner containment vessel - shaft side
 306   //-----------------------------------------------
 307   TGeoPcon *tcss = new TGeoPcon(0.,360.,10);
 308   //
 309   tcss->DefineSection(0,71.3,56.9,58.8);
 310   tcss->DefineSection(1,73.0,56.9,58.8);
 311   //
 312   tcss->DefineSection(2,73.0,56.9,61.2);
 313   tcss->DefineSection(3,73.3,56.9,61.2);
 314   //
 315   tcss->DefineSection(4,73.3,60.1,61.2);
 316   tcss->DefineSection(5,74.0,60.1,61.2);
 317   //
 318   tcss->DefineSection(6,74.0,60.9,61.2);
 319   tcss->DefineSection(7,253.6,65.6,65.9);
 320   //
 321   tcss->DefineSection(8,253.6,65.6,74.2);
 322   tcss->DefineSection(9,258.1,65.6,74.2);
 323   //
 324   TGeoVolume *v8 = new TGeoVolume("TPC_ICVS",tcss,m3);
 325   //-----------------------------------------------
 326   //  Inner field cage
 327   //  define 4 parts and make an assembly
 328   //-----------------------------------------------
 329   // part1 - Al - 2 copies
 330   TGeoTube *t1 = new TGeoTube(76.6774,78.845,0.75);
 331   TGeoVolume *tv1 = new TGeoVolume("TPC_IFC2",t1,m3);
 332   // sandwich - outermost parts - 2 copies
 333   TGeoTube *t2 = new TGeoTube(76.6774,78.845,74.175); // tedlar 38 microns
 334   TGeoTube *t3 = new TGeoTube(76.6812,78.8412,74.175); // prepreg2 500 microns
 335   TGeoTube *t4 = new TGeoTube(76.7312,78.7912,74.175); // prepreg3 300 microns
 336   TGeoTube *t5 = new TGeoTube(76.7612,78.7612,74.175); // nomex 2 cm
 337   //
 338   TGeoVolume *tv2 = new TGeoVolume("TPC_IFC3",t2,sm2);
 339   TGeoVolume *tv3 = new TGeoVolume("TPC_IFC4",t3,sm3);
 340   TGeoVolume *tv4 = new TGeoVolume("TPC_IFC5",t4,sm5);
 341   TGeoVolume *tv5 = new TGeoVolume("TPC_IFC6",t5,sm4);
 342   //
 343   // middle parts - 2 copies
 344   TGeoTube *t6 = new TGeoTube(76.6774,78.795,5.); // tedlar 38 microns
 345   TGeoTube *t7 = new TGeoTube(76.6812,78.7912,5.); // prepreg2 250 microns
 346   TGeoTube *t8 = new TGeoTube(76.7062,78.7662,5.); // prepreg3 300 microns
 347   TGeoTube *t9 = new TGeoTube(76.7362,78.7362,5.); // nomex 2 cm
 348   //
 349   TGeoVolume *tv6 = new TGeoVolume("TPC_IFC7",t6,sm2);
 350   TGeoVolume *tv7 = new TGeoVolume("TPC_IFC8",t7,sm3);
 351   TGeoVolume *tv8 = new TGeoVolume("TPC_IFC9",t8,sm5);
 352   TGeoVolume *tv9 = new TGeoVolume("TPC_IFC10",t9,sm4);
 353   // central part - 1 copy
 354   TGeoTube *t10 = new TGeoTube(76.6774,78.745,93.75); // tedlar 38 microns
 355   TGeoTube *t11 = new TGeoTube(76.6812,78.7412,93.75); // prepreg3 300 microns
 356   TGeoTube *t12 = new TGeoTube(76.7112,78.7112,93.75); // nomex 2 cm
 357   //
 358   TGeoVolume *tv10 = new TGeoVolume("TPC_IFC11",t10,sm2);
 359   TGeoVolume *tv11 = new TGeoVolume("TPC_IFC12",t11,sm5);
 360   TGeoVolume *tv12 = new TGeoVolume("TPC_IFC13",t12,sm4);
 361   //
 362   // inner part - positioning
 363   //
 364   // creating a sandwich
 365   tv2->AddNode(tv3,1); tv3->AddNode(tv4,1); tv4->AddNode(tv5,1);
 366   //
 367   tv6->AddNode(tv7,1); tv7->AddNode(tv8,1); tv8->AddNode(tv9,1);
 368   //
 369   tv10->AddNode(tv11,1); tv11->AddNode(tv12,1);
 370   //
 371   TGeoVolumeAssembly *tv100 = new TGeoVolumeAssembly("TPC_IFC");
 372   //
 373   tv100->AddNode(tv10,1);
 374   tv100->AddNode(tv6,1,new TGeoTranslation(0.,0.,-98.75));
 375   tv100->AddNode(tv6,2,new TGeoTranslation(0.,0.,98.75));
 376   tv100->AddNode(tv2,1,new TGeoTranslation(0.,0.,-177.925));
 377   tv100->AddNode(tv2,2,new TGeoTranslation(0.,0.,177.925));
 378   tv100->AddNode(tv1,1,new TGeoTranslation(0.,0.,-252.85));
 379   tv100->AddNode(tv1,2,new TGeoTranslation(0.,0.,252.85));
 380   //
 381   v5->AddNode(v6,1, new TGeoTranslation(0.,0.,-252.1));
 382   v5->AddNode(v6,2, new TGeoTranslation(0.,0.,252.1));
 383   v1->AddNode(v5,1); v1->AddNode(v7,1); v1->AddNode(v8,1);
 384   v9->AddNode(tv100,1);
 385   //
 386   // central drum
 387   //
 388   // flange + sandwich
 389   //
 390   TGeoPcon *cfl = new TGeoPcon(0.,360.,6);
 391   cfl->DefineSection(0,-71.1,59.7,61.2);
 392   cfl->DefineSection(1,-68.6,59.7,61.2);
 393   //
 394   cfl->DefineSection(2,-68.6,60.6324,61.2);
 395   cfl->DefineSection(3,68.6,60.6324,61.2);
 396   //
 397   cfl->DefineSection(4,68.6,59.7,61.2);
 398   cfl->DefineSection(5,71.1,59.7,61.2);
 399   //
 400   TGeoVolume *cflv = new TGeoVolume("TPC_CDR",cfl,m3);
 401   // sandwich
 402   TGeoTube *cd1 = new TGeoTube(60.6424,61.19,71.1);
 403   TGeoTube *cd2 = new TGeoTube(60.6462,61.1862,71.1);
 404   TGeoTube *cd3 = new TGeoTube(60.6662,61.1662,71.1);
 405   //
 406   TGeoMedium *sm6 = gGeoManager->GetMedium("TPC_Prepreg1");
 407   TGeoVolume *cd1v = new TGeoVolume("TPC_CDR1",cd1,sm2); //tedlar
 408   TGeoVolume *cd2v = new TGeoVolume("TPC_CDR2",cd2,sm6);// prepreg1
 409   TGeoVolume *cd3v = new TGeoVolume("TPC_CDR3",cd3,sm4); //nomex
 410   //
 411   // seals for central drum 2 copies
 412   //
 413   TGeoTube *cs = new TGeoTube(56.9,61.2,0.1);
 414   TGeoMedium *sm7 = gGeoManager->GetMedium("TPC_Mylar");
 415   TGeoVolume *csv = new TGeoVolume("TPC_CDRS",cs,sm7);
 416   v1->AddNode(csv,1,new TGeoTranslation(0.,0.,-71.2));
 417   v1->AddNode(csv,2,new TGeoTranslation(0.,0.,71.2));
 418   //
 419   // seal collars
 420   TGeoPcon *se = new TGeoPcon(0.,360.,6);
 421   se->DefineSection(0,-72.8,59.7,61.2);
 422   se->DefineSection(1,-72.3,59.7,61.2);
 423   //
 424   se->DefineSection(2,-72.3,58.85,61.2);
 425   se->DefineSection(3,-71.6,58.85,61.2);
 426   //
 427   se->DefineSection(4,-71.6,59.7,61.2);
 428   se->DefineSection(5,-71.3,59.7,61.2);
 429   //
 430   TGeoVolume *sev = new TGeoVolume("TPC_CDCE",se,m3);
 431   //
 432   TGeoTube *si = new TGeoTube(56.9,58.8,1.);
 433   TGeoVolume *siv = new TGeoVolume("TPC_CDCI",si,m3);
 434   //
 435   // define reflection matrix
 436   //
 437   TGeoRotation *ref = new TGeoRotation("ref",90.,0.,90.,90.,180.,0.);
 438   //
 439   cd1v->AddNode(cd2v,1); cd2v->AddNode(cd3v,1); cflv->AddNode(cd1v,1);
 440   //
 441   v1->AddNode(siv,1,new TGeoTranslation(0.,0.,-69.9));
 442   v1->AddNode(siv,2,new TGeoTranslation(0.,0.,69.9));
 443   v1->AddNode(sev,1); v1->AddNode(sev,2,ref); v1->AddNode(cflv,1);
 444   //
 445   // central membrane - 2 rings and a mylar membrane - assembly
 446   //
 447   TGeoTube *ih = new TGeoTube(81.05,84.05,0.3);
 448   TGeoTube *oh = new TGeoTube(250.,256.,.5);
 449   TGeoTube *mem = new TGeoTube(84.05,250,0.01);
 450   TGeoVolume *ihv = new TGeoVolume("TPC_IHVH",ih,m3);
 451   TGeoVolume *ohv = new TGeoVolume("TPC_OHVH",oh,m3);
 452   TGeoVolume *memv = new TGeoVolume("TPC_HV",mem,sm7);
 453   //
 454   TGeoVolumeAssembly *cm = new TGeoVolumeAssembly("TPC_HVMEM");
 455   cm->AddNode(ihv,1);
 456   cm->AddNode(ohv,1);
 457   cm->AddNode(memv,1);
 458   v9->AddNode(cm,1);
 459   //
 460   // end caps - they are make as an assembly of single segments
 461   // containing both readout chambers
 462   //
 463   Double_t openingAngle = 10.*TMath::DegToRad();
 464   Double_t thick=1.5; // rib
 465   Double_t shift = thick/TMath::Sin(openingAngle);
 466   //
 467   Double_t lowEdge = 86.3; // hole in the wheel
 468   Double_t upEdge = 240.4; // hole in the wheel
 469   //
 470   new TGeoTubeSeg("sec",74.5,264.4,3.,0.,20.);
 471   //
 472   TGeoPgon *hole = new TGeoPgon("hole",0.,20.,1,4);
 473   //
 474   hole->DefineSection(0,-3.5,lowEdge-shift,upEdge-shift);
 475   hole->DefineSection(1,-1.5,lowEdge-shift,upEdge-shift);
 476   //
 477   hole->DefineSection(2,-1.5,lowEdge-shift,upEdge+3.-shift);
 478   hole->DefineSection(3,3.5,lowEdge-shift,upEdge+3.-shift);
 479   //
 480   Double_t ys = shift*TMath::Sin(openingAngle);
 481   Double_t xs = shift*TMath::Cos(openingAngle);
 482   TGeoTranslation *tr = new TGeoTranslation("tr",xs,ys,0.);
 483   tr->RegisterYourself();
 484   TGeoCompositeShape *chamber = new TGeoCompositeShape("sec-hole:tr");
 485   TGeoVolume *sv = new TGeoVolume("TPC_WSEG",chamber,m3);
 486   TGeoPgon *bar = new TGeoPgon("bar",0.,20.,1,2);
 487   bar->DefineSection(0,-3.,131.5-shift,136.5-shift);
 488   bar->DefineSection(1,1.5,131.5-shift,136.5-shift);
 489   TGeoVolume *barv = new TGeoVolume("TPC_WBAR",bar,m3);
 490   TGeoVolumeAssembly *ch = new TGeoVolumeAssembly("TPC_WCH");//empty segment
 491   //
 492   ch->AddNode(sv,1); ch->AddNode(barv,1,tr);
 493   //
 494   // readout chambers
 495   //
 496   // IROC first
 497   //
 498    TGeoTrd1 *ibody = new TGeoTrd1(13.8742,21.3328,4.29,21.15);
 499    TGeoVolume *ibdv = new TGeoVolume("TPC_IROCB",ibody,m3);
 500   // empty space
 501    TGeoTrd1 *emp = new TGeoTrd1(12.3742,19.8328,3.99,19.65);
 502    TGeoVolume *empv = new TGeoVolume("TPC_IROCE",emp,m1);
 503    ibdv->AddNode(empv,1,new TGeoTranslation(0.,-0.3,0.));
 504    //bars
 505    Double_t tga = (19.8328-12.3742)/39.3;
 506    Double_t xmin,xmax;
 507    xmin = 9.55*tga+12.3742;
 508    xmax = 9.95*tga+12.3742;
 509    TGeoTrd1 *ib1 = new TGeoTrd1(xmin,xmax,3.29,0.2);
 510    TGeoVolume *ib1v = new TGeoVolume("TPC_IRB1",ib1,m3);
 511    empv->AddNode(ib1v,1,new TGeoTranslation("tt1",0.,0.7,-9.9));
 512    xmin=19.4*tga+12.3742;
 513    xmax=19.9*tga+12.3742;
 514    TGeoTrd1 *ib2 = new TGeoTrd1(xmin,xmax,3.29,0.25);
 515    TGeoVolume *ib2v = new TGeoVolume("TPC_TRB2",ib2,m3);
 516    empv->AddNode(ib2v,1,new TGeoTranslation(0.,0.7,0.));
 517    xmin=29.35*tga+12.3742;
 518    xmax=29.75*tga+12.3742;
 519    TGeoTrd1 *ib3 = new TGeoTrd1(xmin,xmax,3.29,0.2);
 520    TGeoVolume *ib3v = new TGeoVolume("TPC_IRB3",ib3,m3);
 521    empv->AddNode(ib3v,1,new TGeoTranslation(0.,0.7,9.9));
 522    //
 523    // holes for connectors
 524    //
 525    TGeoBBox *conn = new TGeoBBox(0.4,0.3,4.675); // identical for iroc and oroc
 526    TGeoVolume *connv = new TGeoVolume("TPC_RCCON",conn,m1);
 527    TString fileName(gSystem->Getenv("ALICE_ROOT"));
 528    fileName += "/TPC/conn_iroc.dat";
 529    ifstream in;
 530    in.open(fileName.Data(), ios_base::in); // asci file
 531    for(Int_t i =0;i<86;i++){
 532       Double_t y = 3.99;
 533       Double_t x,z,ang;
 534       in>>x>>z>>ang;
 535       z-=26.5;
 536       TGeoRotation *rrr = new TGeoRotation();
 537       rrr->RotateY(ang);
 538       TGeoCombiTrans *trans = new TGeoCombiTrans("trans",x,y,z,rrr);
 539       ibdv->AddNode(connv,i+1,trans);
 540    }
 541    in.close();
 542    // "cap"
 543    new TGeoTrd1("icap",14.5974,23.3521,1.19,24.825);
 544    // "hole"
 545    new TGeoTrd1("ihole",13.8742,21.3328,1.2,21.15);
 546    TGeoTranslation *tr1 = new TGeoTranslation("tr1",0.,0.,1.725);
 547    tr1->RegisterYourself();
 548    TGeoCompositeShape *ic = new TGeoCompositeShape("icap-ihole:tr1");
 549    TGeoVolume *icv = new TGeoVolume("TPC_IRCAP",ic,m3);
 550    //
 551    // pad plane and wire fixations
 552    //
 553    TGeoTrd1 *pp = new TGeoTrd1(14.5974,23.3521,0.3,24.825); //pad+iso
 554    TGeoMedium *m4 = gGeoManager->GetMedium("TPC_G10");
 555    TGeoVolume *ppv = new TGeoVolume("TPC_IRPP",pp,m4);
 556    TGeoPara *f1 = new TGeoPara(.6,.5,24.825,0.,-10.,0.);
 557    TGeoVolume *f1v = new TGeoVolume("TPC_IRF1",f1,m4);
 558    TGeoPara *f2 = new TGeoPara(.6,.5,24.825,0.,10.,0.);
 559    TGeoVolume *f2v = new TGeoVolume("TPC_IRF2",f2,m4);
 560    //
 561    TGeoVolumeAssembly *iroc = new TGeoVolumeAssembly("TPC_IROC");
 562    //
 563    iroc->AddNode(ibdv,1);
 564    iroc->AddNode(icv,1,new TGeoTranslation(0.,3.1,-1.725));
 565    iroc->AddNode(ppv,1,new TGeoTranslation(0.,4.59,-1.725));
 566    tga =(23.3521-14.5974)/49.65;
 567    Double_t xx = 24.825*tga+14.5974-0.6;
 568    iroc->AddNode(f1v,1,new TGeoTranslation(-xx,5.39,-1.725));
 569    iroc->AddNode(f2v,1,new TGeoTranslation(xx,5.39,-1.725));
 570    //
 571    // OROC
 572    //
 573    TGeoTrd1 *obody = new TGeoTrd1(22.2938,40.5084,4.19,51.65);
 574    TGeoVolume *obdv = new TGeoVolume("TPC_OROCB",obody,m3);
 575    TGeoTrd1 *oemp = new TGeoTrd1(20.2938,38.5084,3.89,49.65);
 576    TGeoVolume *oempv = new TGeoVolume("TPC_OROCE",oemp,m1);
 577    obdv->AddNode(oempv,1,new TGeoTranslation(0.,-0.3,0.));
 578    //horizontal bars
 579    tga=(38.5084-20.2938)/99.3;
 580    xmin=tga*10.2+20.2938;
 581    xmax=tga*10.6+20.2938;
 582    TGeoTrd1 *ob1 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 583    TGeoVolume *ob1v = new TGeoVolume("TPC_ORB1",ob1,m3);
 584    //
 585    xmin=22.55*tga+20.2938;
 586    xmax=24.15*tga+20.2938;
 587    TGeoTrd1 *ob2 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 588    TGeoVolume *ob2v = new TGeoVolume("TPC_ORB2",ob2,m3);
 589    //
 590    xmin=36.1*tga+20.2938;
 591    xmax=36.5*tga+20.2938;
 592    TGeoTrd1 *ob3 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 593    TGeoVolume *ob3v = new TGeoVolume("TPC_ORB3",ob3,m3);
 594    //
 595    xmin=49.0*tga+20.2938;
 596    xmax=50.6*tga+20.2938;
 597    TGeoTrd1 *ob4 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 598    TGeoVolume *ob4v = new TGeoVolume("TPC_ORB4",ob4,m3);
 599    //
 600    xmin=63.6*tga+20.2938;
 601    xmax=64.0*tga+20.2938;
 602    TGeoTrd1 *ob5 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 603    TGeoVolume *ob5v = new TGeoVolume("TPC_ORB5",ob5,m3);
 604    //
 605    xmin=75.5*tga+20.2938;
 606    xmax=77.15*tga+20.2938;
 607    TGeoTrd1 *ob6 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 608    TGeoVolume *ob6v = new TGeoVolume("TPC_ORB6",ob6,m3);
 609    //
 610    xmin=88.7*tga+20.2938;
 611    xmax=89.1*tga+20.2938;
 612    TGeoTrd1 *ob7 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 613    TGeoVolume *ob7v = new TGeoVolume("TPC_ORB7",ob7,m3);
 614    //
 615    oempv->AddNode(ob1v,1,new TGeoTranslation(0.,0.975,-39.25));
 616    oempv->AddNode(ob2v,1,new TGeoTranslation(0.,0.975,-26.3));
 617    oempv->AddNode(ob3v,1,new TGeoTranslation(0.,0.975,-13.35));
 618    oempv->AddNode(ob4v,1,new TGeoTranslation(0.,0.975,0.15));
 619    oempv->AddNode(ob5v,1,new TGeoTranslation(0.,0.975,14.15));
 620    oempv->AddNode(ob6v,1,new TGeoTranslation(0.,0.975,26.7));
 621    oempv->AddNode(ob7v,1,new TGeoTranslation(0.,0.975,39.25));
 622    // vertical bars
 623    TGeoBBox *ob8 = new TGeoBBox(0.8,2.915,5.1);
 624    TGeoBBox *ob9 = new TGeoBBox(0.8,2.915,5.975);
 625    TGeoBBox *ob10 = new TGeoBBox(0.8,2.915,5.775);
 626    TGeoBBox *ob11 = new TGeoBBox(0.8,2.915,6.25);
 627    TGeoBBox *ob12 = new TGeoBBox(0.8,2.915,6.5);
 628    //
 629    TGeoVolume *ob8v = new TGeoVolume("TPC_ORB8",ob8,m3);
 630    TGeoVolume *ob9v = new TGeoVolume("TPC_ORB9",ob9,m3);
 631    TGeoVolume *ob10v = new TGeoVolume("TPC_ORB10",ob10,m3);
 632    TGeoVolume *ob11v = new TGeoVolume("TPC_ORB11",ob11,m3);
 633    TGeoVolume *ob12v = new TGeoVolume("TPC_ORB12",ob12,m3);
 634    //
 635    oempv->AddNode(ob8v,1,new TGeoTranslation(0.,0.975,-44.55));
 636    oempv->AddNode(ob8v,2,new TGeoTranslation(0.,0.975,44.55));
 637    oempv->AddNode(ob9v,1,new TGeoTranslation(0.,0.975,-33.075));
 638    oempv->AddNode(ob9v,2,new TGeoTranslation(0.,0.975,-19.525));
 639    oempv->AddNode(ob10v,1,new TGeoTranslation(0.,0.975,20.125));
 640    oempv->AddNode(ob10v,2,new TGeoTranslation(0.,0.975,33.275));
 641    oempv->AddNode(ob11v,1,new TGeoTranslation(0.,0.975,-6.9));
 642    oempv->AddNode(ob12v,1,new TGeoTranslation(0.,0.975,7.45));
 643    //
 644    // holes for connectors
 645    //
 646    fileName = gSystem->Getenv("ALICE_ROOT");
 647    fileName += "/TPC/conn_oroc.dat";
 648    in.open(fileName.Data(), ios_base::in); // asci file
 649    for(Int_t i =0;i<78;i++){
 650       Double_t y =3.89;
 651       Double_t x,z,ang;
 652       Double_t x1,z1,x2,z2;
 653       in>>x>>z>>ang;
 654       Double_t xr = 4.7*TMath::Sin(ang*TMath::DegToRad());
 655       Double_t zr = 4.7*TMath::Cos(ang*TMath::DegToRad());
 656       //
 657       x1=xr+x; x2=-xr+x; z1=zr+z; z2 = -zr+z;
 658       //
 659       TGeoRotation *rr = new TGeoRotation();
 660       rr->RotateY(ang);
 661       z1-=54.95;
 662       z2-=54.95;
 663       TGeoCombiTrans *trans1 = new TGeoCombiTrans("trans1",x1,y,z1,rr);
 664       TGeoCombiTrans *trans2 = new TGeoCombiTrans("trans2",x2,y,z2,rr);
 665       obdv->AddNode(connv,i+1,trans1);
 666       obdv->AddNode(connv,i+79,trans2);
 667    }
 668    in.close();
 669    // cap
 670    new TGeoTrd1("ocap",23.3874,43.5239,1.09,57.1);
 671    new TGeoTrd1("ohole",22.2938,40.5084,1.09,51.65);
 672    TGeoTranslation *tr5 = new TGeoTranslation("tr5",0.,0.,-2.15);
 673    tr5->RegisterYourself();
 674    TGeoCompositeShape *oc = new TGeoCompositeShape("ocap-ohole:tr5");
 675    TGeoVolume *ocv = new TGeoVolume("TPC_ORCAP",oc,m3);
 676    //
 677    // pad plane and wire fixations
 678    //
 679    TGeoTrd1 *opp = new TGeoTrd1(23.3874,43.5239,0.3,57.1);
 680    TGeoVolume *oppv = new TGeoVolume("TPC_ORPP",opp,m4);
 681    //
 682    tga=(43.5239-23.3874)/114.2;
 683    TGeoPara *f3 = new TGeoPara(.7,.6,57.1,0.,-10.,0.);
 684    TGeoPara *f4 = new TGeoPara(.7,.6,57.1,0.,10.,0.);
 685    xx = 57.1*tga+23.3874-0.7;
 686    TGeoVolume *f3v = new TGeoVolume("TPC_ORF1",f3,m4);
 687    TGeoVolume *f4v = new TGeoVolume("TPC_ORF2",f4,m4);
 688    //
 689    TGeoVolumeAssembly *oroc = new TGeoVolumeAssembly("TPC_OROC");
 690    //
 691    oroc->AddNode(obdv,1);
 692    oroc->AddNode(ocv,1,new TGeoTranslation(0.,3.1,2.15));
 693    oroc->AddNode(oppv,1,new TGeoTranslation(0.,4.49,2.15));
 694    oroc->AddNode(f3v,1,new TGeoTranslation(-xx,5.39,2.15));
 695    oroc->AddNode(f4v,1,new TGeoTranslation(xx,5.39,2.15));
 696    //
 697    // now iroc and oroc are placed into a sector...
 698    //
 699    TGeoVolumeAssembly *secta = new TGeoVolumeAssembly("TPC_SECT"); // a-side
 700    TGeoVolumeAssembly *sectc = new TGeoVolumeAssembly("TPC_SECT"); // c-side
 701    TGeoRotation rot1("rot1",90.,90.,0.);
 702    TGeoRotation rot2("rot2");
 703    rot2.RotateY(10.);
 704    TGeoRotation *rot = new TGeoRotation("rot");
 705    *rot=rot1*rot2;
 706    //
 707    Double_t x0,y0;
 708    x0=110.2*TMath::Cos(openingAngle);
 709    y0=110.2*TMath::Sin(openingAngle);
 710    TGeoCombiTrans *combi1a = new TGeoCombiTrans("combi1",x0,y0,1.09+0.195,rot); //a-side
 711    TGeoCombiTrans *combi1c = new TGeoCombiTrans("combi1",x0,y0,1.09+0.222,rot); //c-side
 712    x0=188.45*TMath::Cos(openingAngle);
 713    y0=188.45*TMath::Sin(openingAngle);
 714    TGeoCombiTrans *combi2a = new TGeoCombiTrans("combi2",x0,y0,0.99+0.195,rot); //a-side
 715    TGeoCombiTrans *combi2c = new TGeoCombiTrans("combi2",x0,y0,0.99+0.222,rot); //c-side
 716    //
 717    // A-side
 718    //
 719    secta->AddNode(ch,1);
 720    secta->AddNode(iroc,1,combi1a);
 721    secta->AddNode(oroc,1,combi2a);
 722    //
 723    // C-side
 724    //
 725    sectc->AddNode(ch,1);
 726    sectc->AddNode(iroc,1,combi1c);
 727    sectc->AddNode(oroc,1,combi2c);
 728    //
 729    // now I try to make  wheels...
 730    //
 731    TGeoVolumeAssembly *wheela = new TGeoVolumeAssembly("TPC_ENDCAP");
 732    TGeoVolumeAssembly *wheelc = new TGeoVolumeAssembly("TPC_ENDCAP");
 733    //
 734    for(Int_t i =0;i<18;i++){
 735      Double_t phi = (20.*i);
 736      TGeoRotation *r = new TGeoRotation();
 737      r->RotateZ(phi);
 738      wheela->AddNode(secta,i+1,r);
 739      wheelc->AddNode(sectc,i+1,r);
 740
 741    }
 742    // wheels in the drift volume!
 743    TGeoCombiTrans *combi3 = new TGeoCombiTrans("combi3",0.,0.,256.6,ref);
 744    v9->AddNode(wheela,1,combi3);
 745    v9->AddNode(wheelc,2,new TGeoTranslation(0.,0.,-256.6));
 746
 747    //_____________________________________________________________
 748    // service support wheel
 749    //_____________________________________________________________
 750   TGeoPgon *sw = new TGeoPgon(0.,20.,1,2);
 751   sw->DefineSection(0,-4.,80.5,251.75);
 752   sw->DefineSection(1,4.,80.5,251.75);
 753   TGeoVolume *swv = new TGeoVolume("TPC_SWSEG",sw,m3); //Al
 754   //
 755   thick=1.;
 756   shift = thick/TMath::Sin(openingAngle);
 757   TGeoPgon *sh = new TGeoPgon(0.,20.,1,2);
 758   sh->DefineSection(0,-4.,81.5-shift,250.75-shift);
 759   sh->DefineSection(1,4.,81.5-shift,250.75-shift);
 760   TGeoVolume *shv = new TGeoVolume("TPC_SWS1",sh,m1); //Air
 761   //
 762   TGeoMedium *m9 =  gGeoManager->GetMedium("TPC_Si");
 763   TGeoPgon *el = new TGeoPgon(0.,20.,1,2);
 764   el->DefineSection(0,-1.872,81.5-shift,250.75-shift);
 765   el->DefineSection(1,1.872,81.5-shift,250.75-shift);
 766   TGeoVolume *elv = new TGeoVolume("TPC_ELEC",el,m9); //Si
 767   //
 768   shv->AddNode(elv,1);
 769   //
 770   ys = shift*TMath::Sin(openingAngle);
 771   xs = shift*TMath::Cos(openingAngle);
 772   swv->AddNode(shv,1,new TGeoTranslation(xs,ys,0.));
 773   // cover
 774   TGeoPgon *co = new TGeoPgon(0.,20.,1,2);
 775   co->DefineSection(0,-0.5,77.,255.25);
 776   co->DefineSection(1,0.5,77.,255.25);
 777   TGeoVolume *cov = new TGeoVolume("TPC_SWC1",co,m3);//Al
 778   // hole in a cover
 779   TGeoPgon *coh = new TGeoPgon(0.,20.,1,2);
 780   shift=4./TMath::Sin(openingAngle);
 781   coh->DefineSection(0,-0.5,85.-shift,247.25-shift);
 782   coh->DefineSection(1,0.5,85.-shift,247.25-shift);
 783   //
 784   TGeoVolume *cohv = new TGeoVolume("TPC_SWC2",coh,m1);
 785   //
 786   ys = shift*TMath::Sin(openingAngle);
 787   xs = shift*TMath::Cos(openingAngle);
 788   cov->AddNode(cohv,1,new TGeoTranslation(xs,ys,0.));
 789   //
 790   // Sector as an Assembly
 791   //
 792   TGeoVolumeAssembly *swhs = new TGeoVolumeAssembly("TPC_SSWSEC");
 793   swhs->AddNode(swv,1);
 794   swhs->AddNode(cov,1,new TGeoTranslation(0.,0.,-4.5));
 795   swhs->AddNode(cov,2,new TGeoTranslation(0.,0.,4.5));
 796   //
 797   // SSW as an Assembly of sectors
 798   //
 799  TGeoVolumeAssembly *swheel = new TGeoVolumeAssembly("TPC_SSWHEEL");
 800    for(Int_t i =0;i<18;i++){
 801      Double_t phi = (20.*i);
 802      TGeoRotation *r = new TGeoRotation();
 803      r->RotateZ(phi);
 804      swheel->AddNode(swhs,i+1,r);
 805    }
 806    v1->AddNode(swheel,1,new TGeoTranslation(0.,0.,-284.6));
 807    v1->AddNode(swheel,2,new TGeoTranslation(0.,0.,284.6));
 808    //
 809   //----------------------------------------------------------
 810   // TPc Support Rods - MAKROLON
 811   //----------------------------------------------------------
 812   TGeoMedium *m6=gGeoManager->GetMedium("TPC_Makrolon");
 813   TGeoMedium *m7=gGeoManager->GetMedium("TPC_Cu");
 814   TGeoMedium *m10 =  gGeoManager->GetMedium("TPC_Alumina");
 815   TGeoMedium *m11 =  gGeoManager->GetMedium("TPC_Peek");
 816   TGeoMedium *m12 =  gGeoManager->GetMedium("TPC_Water");
 817   // upper and lower rods differ in length!
 818   Double_t *upar;
 819   upar=NULL;
 820   gGeoManager->Volume("TPC_Rod","TUBE",m6->GetId(),upar);
 821   upar=new Double_t [3];
 822   upar[0]=1.8;
 823   upar[1]=2.2;
 824
 825   //
 826   //HV rods - makrolon + 0.58cm (diameter) Cu
 827   TGeoTube *hvr = new TGeoTube(0.,2.2,126.64);
 828   TGeoTube *hvc = new TGeoTube(0.,0.29,126.64);
 829   //
 830   TGeoVolume *hvrv = new TGeoVolume("TPC_HV_Rod",hvr,m6);
 831   TGeoVolume *hvcv = new TGeoVolume("TPC_HV_Cable",hvc,m7);
 832   hvrv->AddNode(hvcv,1);
 833   //
 834   // resistor rods
 835   //
 836   TGeoTube *cri = new TGeoTube(0.,0.45,126.64); //inner
 837   TGeoTube *cro = new TGeoTube(0.,0.45,126.54); //outer
 838   TGeoTube *cwi = new TGeoTube(0.,0.15,126.64); // water inner
 839   TGeoTube *cwo = new TGeoTube(0.,0.15,126.54); // water outer
 840   //
 841   TGeoVolume *criv = new TGeoVolume("TPC_CR_I",cri,m10);
 842   TGeoVolume *crov = new TGeoVolume("TPC_CR_O",cro,m10);
 843   TGeoVolume *cwiv = new TGeoVolume("TPC_W_I",cwi,m11);
 844   TGeoVolume *cwov = new TGeoVolume("TPC_W_O",cwo,m11);
 845   //
 846   // ceramic rod with water
 847   //
 848   criv->AddNode(cwiv,1);
 849   crov->AddNode(cwov,1);
 850   //
 851   TGeoTube *pri =new TGeoTube(0.2,0.35,126.64); //inner
 852   TGeoTube *pro = new TGeoTube(0.2,0.35,126.54); //outer
 853   //
 854   // peek rod
 855   //
 856   TGeoVolume *priv = new TGeoVolume("TPC_PR_I",pri,m12);
 857   TGeoVolume *prov = new TGeoVolume("TPC_PR_O",pro,m12);
 858   //
 859   // resistor rods assembly
 860   //
 861    TGeoRotation *rotr = new TGeoRotation("rotr");
 862    rotr->RotateZ(-21.);
 863   //
 864   TGeoTube *rri = new TGeoTube(1.8,2.2,126.64);//inner
 865   TGeoTube *rro = new TGeoTube(1.8,2.2,126.54);//inner
 866   //
 867   TGeoVolume *rriv = new TGeoVolume("TPC_RR_I",rri,m6);
 868   TGeoVolume *rrov = new TGeoVolume("TPC_RR_O",rro,m6);
 869   //
 870   TGeoVolumeAssembly *rrin = new TGeoVolumeAssembly("TPC_RROD_I");
 871   TGeoVolumeAssembly *rrou = new TGeoVolumeAssembly("TPC_RROD_O");
 872   rrin->AddNode(rriv,1);
 873   rrin->AddNode(criv,1,new TGeoTranslation(0.5,0.866, 0.));
 874   rrin->AddNode(criv,2,new TGeoTranslation(0.5,-0.866, 0.));
 875   rrin->AddNode(priv,1);
 876   //
 877   rrou->AddNode(rrov,1);
 878   rrou->AddNode(crov,1,new TGeoTranslation(0.5,0.866, 0.));
 879   rrou->AddNode(crov,2,new TGeoTranslation(0.5,-0.866, 0.));
 880   rrou->AddNode(prov,1);
 881   for(Int_t i=0;i<18;i++){
 882     Double_t angle,x,y;
 883     Double_t z,r;
 884     angle=TMath::DegToRad()*20.*(Double_t)i;
 885     r=81.5;
 886     x=r * TMath::Cos(angle);
 887     y=r * TMath::Sin(angle);
 888     upar[2]=126.64; //lower
 889     z= 126.96;
 890     //
 891     if(i==3){
 892       v9->AddNode(rrin,1,new TGeoCombiTrans(x,y,z,rotr)); //A
 893       v9->AddNode(rrin,2,new TGeoCombiTrans(x,y,-z,rotr)); //C
 894     }
 895     else {
 896       gGeoManager->Node("TPC_Rod",i+1,"TPC_Drift",x,y,z,0,kTRUE,upar,3);//shaft
 897       gGeoManager->Node("TPC_Rod",i+19,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);//muon
 898     }
 899
 900
 901     //
 902     r=254.25;
 903     x=r * TMath::Cos(angle);
 904     y=r * TMath::Sin(angle);
 905     upar[2]=126.54; //upper
 906     z=127.06;
 907     if(i==15){
 908       //v9->AddNode(hvrv,1,new TGeoTranslation(x,y,z));//A-side only
 909       v9->AddNode(hvrv,1,new TGeoTranslation(x,y,127.14));//A-side only
 910       gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
 911     }
 912     else if(i==11){
 913       v9->AddNode(rrou,1,new TGeoCombiTrans(x,y,z,rotr)); //A
 914       v9->AddNode(rrou,2,new TGeoCombiTrans(x,y,-z,rotr)); //C
 915     }
 916     else{
 917     //
 918       gGeoManager->Node("TPC_Rod",i+37,"TPC_Drift",x,y,z,0,kTRUE,upar,3);
 919       gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
 920     }
 921   }
 922
 923   TGeoVolume *alice = gGeoManager->GetVolume("ALIC");
 924   alice->AddNode(v1,1);
 925
 926
 927
 928 } // end of function
 929
 930 //_____________________________________________________________________________
 931 void AliTPCv3::DrawDetector()
 932 {
 933   //
 934   // Draw a shaded view of the Time Projection Chamber version 3
 935   //
 936
 937
 938   // Set everything unseen
 939   gMC->Gsatt("*", "seen", -1);
 940   //
 941   // Set ALIC mother transparent
 942   gMC->Gsatt("ALIC","SEEN",0);
 943   //
 944   // Set the volumes visible
 945   //
 946
 947   gMC->Gsatt("TPC ","SEEN",0);
 948   gMC->Gsatt("TOIN","SEEN",1);
 949   gMC->Gsatt("TOIN","COLO",7);
 950   gMC->Gsatt("TOCV","SEEN",1);
 951   gMC->Gsatt("TOCV","COLO",4);
 952   gMC->Gsatt("TSA1","SEEN",0);
 953   gMC->Gsatt("TSA2","SEEN",0);
 954   gMC->Gsatt("TSA3","SEEN",0);
 955   gMC->Gsatt("TSA4","SEEN",0);
 956   gMC->Gsatt("TSA5","SEEN",0);
 957   gMC->Gsatt("TOFC","SEEN",1);
 958   gMC->Gsatt("TOFC","COLO",4);
 959   gMC->Gsatt("TSA6","SEEN",0);
 960   gMC->Gsatt("TSA7","SEEN",0);
 961   gMC->Gsatt("TSA8","SEEN",0);
 962   gMC->Gsatt("TIIN","SEEN",1);
 963   gMC->Gsatt("TIIN","COLO",7);
 964   gMC->Gsatt("TII1","SEEN",0);
 965   gMC->Gsatt("TIFC","SEEN",1);
 966   gMC->Gsatt("TIFC","COLO",4);
 967   gMC->Gsatt("TSA9","SEEN",0);
 968   gMC->Gsatt("TS10","SEEN",0);
 969   gMC->Gsatt("TS11","SEEN",0);
 970   gMC->Gsatt("TS12","SEEN",0);
 971   gMC->Gsatt("TS13","SEEN",0);
 972   gMC->Gsatt("TS14","SEEN",0);
 973   gMC->Gsatt("TICC","SEEN",0);
 974   gMC->Gsatt("TICM","SEEN",0);
 975   gMC->Gsatt("TS15","SEEN",0);
 976   gMC->Gsatt("TS16","SEEN",0);
 977   gMC->Gsatt("TS17","SEEN",0);
 978   gMC->Gsatt("TS18","SEEN",0);
 979   gMC->Gsatt("TS19","SEEN",0);
 980   gMC->Gsatt("TPJ1","SEEN",0);
 981   gMC->Gsatt("TPJ2","SEEN",0);
 982   gMC->Gsatt("TICS","SEEN",0);
 983   gMC->Gsatt("TDGS","SEEN",0);
 984   gMC->Gsatt("TIRC","SEEN",0);
 985   gMC->Gsatt("TIC1","SEEN",1);
 986   gMC->Gsatt("TIPP","SEEN",0);
 987   gMC->Gsatt("TIC3","SEEN",0);
 988   gMC->Gsatt("TRCE","SEEN",0);
 989   gMC->Gsatt("TPSC","SEEN",0);
 990   gMC->Gsatt("TPCC","SEEN",0);
 991   gMC->Gsatt("TORC","SEEN",0);
 992   gMC->Gsatt("TOPP","SEEN",0);
 993   gMC->Gsatt("TOC3","SEEN",0);
 994   gMC->Gsatt("TOC1","SEEN",1);
 995   gMC->Gsatt("TSSW","SEEN",1);
 996   gMC->Gsatt("TSWC","SEEN",1);
 997   gMC->Gsatt("TSSW","COLO",3);
 998   gMC->Gsatt("TSWC","COLO",3);
 999   gMC->Gsatt("TSCE","COLO",6);
1000   gMC->Gsatt("TSCE","SEEN",1);
1001   gMC->Gsatt("TWES","SEEN",0);
1002   gMC->Gsatt("TSWB","SEEN",0);
1003   gMC->Gsatt("TPEL","SEEN",0);
1004   gMC->Gsatt("TPMW","SEEN",1);
1005   gMC->Gsatt("TESR","SEEN",1);
1006   gMC->Gsatt("TPMW","COLO",12);
1007   gMC->Gsatt("TIC1","COLO",5);
1008   gMC->Gsatt("TOC1","COLO",5);
1009   gMC->Gsatt("TESB","SEEN",0);
1010   gMC->Gsatt("THVM","SEEN",1);
1011   gMC->Gsatt("THVM","COLO",11);
1012   gMC->Gsatt("THVH","SEEN",0);
1013   gMC->Gsatt("TPSR","SEEN",0);
1014   gMC->Gsatt("THVL","SEEN",0);
1015   gMC->Gsatt("THVC","SEEN",0);
1016   gMC->Gsatt("THVE","SEEN",0);
1017   gMC->Gsatt("THVR","SEEN",0);
1018
1019   //
1020   gMC->Gdopt("hide", "on");
1021   gMC->Gdopt("shad", "on");
1022   gMC->Gsatt("*", "fill", 7);
1023   gMC->SetClipBox(".");
1024   gMC->SetClipBox("TPMW",-300,300,-300,300,254.,270.);
1025   gMC->SetClipBox("TESR",-300,300,-300,300,254.,270.);
1026   gMC->SetClipBox("TSSW",-300,300,-300,300,283.,284.);
1027   gMC->SetClipBox("TSWC",-300,300,-300,300,283.,284.);
1028   gMC->SetClipBox("*", 0, 300, -300, 300, -290, 290);
1029   gMC->DefaultRange();
1030   gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025);
1031   gMC->Gdhead(1111, "Time Projection Chamber");
1032   gMC->Gdman(18, 4, "MAN");
1033   gMC->Gdopt("hide","off");
1034 }
1035
1036 //_____________________________________________________________________________
1037 void AliTPCv3::CreateMaterials()
1038 {
1039   //
1040   // Define materials for version 2 of the Time Projection Chamber
1041   //
1042
1043
1044   //
1045   AliTPC::CreateMaterials();
1046 }
1047
1048 //_____________________________________________________________________________
1049 void AliTPCv3::Init()
1050 {
1051   //
1052   // Initialises version 3 of the TPC after that it has been built
1053   //
1054   Int_t *idtmed = fIdtmed->GetArray();
1055
1056   AliTPC::Init();
1057
1058    fIdSens=gMC->VolId("TPC_Drift"); // drift gas as a sensitive volume
1059
1060   gMC->SetMaxNStep(-30000); // max. number of steps increased
1061
1062   gMC->Gstpar(idtmed[2],"LOSS",5);
1063
1064   printf("%s: *** TPC version 3 initialized***\n",ClassName());
1065
1066   printf("%s: Maximum number of steps = %d\n",ClassName(),gMC->GetMaxNStep());
1067
1068   // printf("*** TPC version 3 initialized ***\n");
1069   // printf("Maximum number of steps = %d\n",gMC->GetMaxNStep());
1070
1071   //
1072
1073 }
1074
1075 //_____________________________________________________________________________
1076 void AliTPCv3::StepManager()
1077 {
1078   //
1079   // Called for every step in the Time Projection Chamber
1080   //
1081
1082   //
1083   // parameters used for the energy loss calculations
1084   //
1085   const Float_t kprim = 14.35; // number of primary collisions per 1 cm
1086   const Float_t kpoti = 20.77e-9; // first ionization potential for Ne/CO2
1087   const Float_t kwIon = 35.97e-9; // energy for the ion-electron pair creation
1088
1089
1090   const Float_t kbig = 1.e10;
1091
1092   Int_t id,copy;
1093   TLorentzVector pos;
1094   Float_t hits[5];
1095   Int_t vol[2];
1096
1097   vol[1]=0;
1098   vol[0]=0;
1099
1100   //
1101
1102   gMC->SetMaxStep(kbig);
1103
1104   if(!gMC->IsTrackAlive()) return; // particle has disappeared
1105
1106   Float_t charge = gMC->TrackCharge();
1107
1108   if(TMath::Abs(charge)<=0.) return; // take only charged particles
1109
1110
1111   id=gMC->CurrentVolID(copy);
1112
1113
1114   if (id != fIdSens) return;
1115
1116   //
1117   //  charged particle is in the sensitive volume
1118   //
1119
1120   if(gMC->TrackStep() > 0) {
1121
1122
1123     Int_t nel = (Int_t)(((gMC->Edep())-kpoti)/kwIon) + 1;
1124     nel=TMath::Min(nel,300); // 300 electrons corresponds to 10 keV
1125
1126     gMC->TrackPosition(pos);
1127     hits[0]=pos[0];
1128     hits[1]=pos[1];
1129     hits[2]=pos[2];
1130
1131     // Get also the track time for pileup simulation
1132     hits[4]=gMC->TrackTime();
1133
1134     //
1135     // check the selected side of the TPC
1136     //
1137
1138     if(fSide && fSide*hits[2]<=0.) return;
1139
1140     hits[3]=(Float_t)nel;
1141
1142     // Add this hit
1143
1144     AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits);  //MI change
1145
1146   }
1147
1148   // Stemax calculation for the next step
1149
1150   Float_t pp;
1151   TLorentzVector mom;
1152   gMC->TrackMomentum(mom);
1153   Float_t ptot=mom.Rho();
1154   Float_t betaGamma = ptot/gMC->TrackMass();
1155
1156   Int_t pid=gMC->TrackPid();
1157   if((pid==kElectron || pid==kPositron) && ptot > 0.002)
1158     {
1159       pp = kprim*1.58; // electrons above 20 MeV/c are on the plateau!
1160     }
1161   else
1162     {
1163       betaGamma = TMath::Max(betaGamma,(Float_t)7.e-3);
1164       pp=kprim*BetheBloch(betaGamma);
1165       if(TMath::Abs(charge) > 1.) pp *= (charge*charge);
1166     }
1167
1168   Double_t rnd = gMC->GetRandom()->Rndm();
1169
1170   gMC->SetMaxStep(-TMath::Log(rnd)/pp);
1171
1172 }
1173
1174 //_____________________________________________________________________________
1175 Float_t AliTPCv3::BetheBloch(Float_t bg)
1176 {
1177   //
1178   // Bethe-Bloch energy loss formula
1179   //
1180   const Double_t kp1=0.76176e-1;
1181   const Double_t kp2=10.632;
1182   const Double_t kp3=0.13279e-4;
1183   const Double_t kp4=1.8631;
1184   const Double_t kp5=1.9479;
1185
1186   Double_t dbg = (Double_t) bg;
1187
1188   Double_t beta = dbg/TMath::Sqrt(1.+dbg*dbg);
1189
1190   Double_t aa = TMath::Power(beta,kp4);
1191   Double_t bb = TMath::Power(1./dbg,kp5);
1192
1193   bb=TMath::Log(kp3+bb);
1194
1195   return ((Float_t)((kp2-aa-bb)*kp1/aa));
1196 }