TPC/AliTPCv2.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 2 -- detailed TPC and slow simulation    //
  22 //                                                                           //
  23 //Begin_Html
  24 /*
  25 <img src="picts/AliTPCv2Class.gif">
  26 */
  27 //End_Html
  28 //                                                                           //
  29 //                                                                           //
  30 ///////////////////////////////////////////////////////////////////////////////
  31
  32 //#include <stdlib.h>
  33
  34 #include <TLorentzVector.h>
  35 #include <TPDGCode.h>
  36 #include <TString.h>
  37 #include "AliLog.h"
  38 #include "AliTrackReference.h"
  39 #include "AliTPCParam.h"
  40 #include "AliTPCTrackHitsV2.h"
  41 #include "AliTPCv2.h"
  42 #include "TGeoVolume.h"
  43 #include "TGeoPcon.h"
  44 #include "TGeoTube.h"
  45 #include "TGeoPgon.h"
  46 #include "TGeoTrd1.h"
  47 #include "TGeoCompositeShape.h"
  48 #include "TGeoPara.h"
  49 #include "TGeoPhysicalNode.h"
  50
  51 ClassImp(AliTPCv2)
  52
  53 //_____________________________________________________________________________
  54 AliTPCv2::AliTPCv2(const char *name, const char *title) :
  55   AliTPC(name, title),
  56   fIdSens(0),
  57   fIDrift(0),
  58   fSecOld(0)
  59 {
  60   //
  61   // Standard constructor for Time Projection Chamber version 2
  62   //
  63
  64
  65   SetBufferSize(128000);
  66
  67
  68   if (fTPCParam)
  69      fTPCParam->Write(fTPCParam->GetTitle());
  70 }
  71
  72 //_____________________________________________________________________________
  73 void AliTPCv2::CreateGeometry()
  74 {
  75   //
  76   // Create the geometry of Time Projection Chamber version 2
  77   //
  78   //Begin_Html
  79   /*
  80     <img src="picts/AliTPC.gif">
  81   */
  82   //End_Html
  83   //Begin_Html
  84   /*
  85     <img src="picts/AliTPCv2Tree.gif">
  86   */
  87   //End_Html
  88
  89   //----------------------------------------------------------
  90   // This geometry is written using TGeo class
  91   // Firstly the shapes are defined, and only then the volumes
  92   // What is recognized by the MC are volumes
  93   //----------------------------------------------------------
  94   //
  95   //  tpc - this will be the mother volume
  96   //
  97
  98   //
  99   // here I define a volume TPC
 100   // retrive the medium name with "TPC_" as a leading string
 101   //
 102   TGeoPcon *tpc = new TGeoPcon(0.,360.,18); //18 sections
 103   tpc->DefineSection(0,-290.,77.,278.);
 104   tpc->DefineSection(1,-259.6,70.,278.);
 105   //
 106   tpc->DefineSection(2,-259.6,68.1,278.);
 107   tpc->DefineSection(3,-253.6,68.1,278.);
 108   //
 109   tpc->DefineSection(4,-253.6,68.,278.);
 110   tpc->DefineSection(5,-74.0,60.8,278.);
 111   //
 112   tpc->DefineSection(6,-74.0,60.1,278.);
 113   tpc->DefineSection(7,-73.3,60.1,278.);
 114   //
 115   tpc->DefineSection(8,-73.3,56.9,278.);
 116   tpc->DefineSection(9,73.3,56.9,278.);
 117   //
 118   tpc->DefineSection(10,73.3,60.1,278.);
 119   tpc->DefineSection(11,74.0,60.1,278.);
 120   //
 121   tpc->DefineSection(12,74.0,60.8,278.);
 122   tpc->DefineSection(13,253.6,65.5,278.);
 123   //
 124   tpc->DefineSection(14,253.6,65.6,278.);
 125   tpc->DefineSection(15,259.6,65.6,278.);
 126   //
 127   tpc->DefineSection(16,259.6,70.0,278.);
 128   tpc->DefineSection(17,290.,77.,278.);
 129   //
 130   TGeoMedium *m1 = gGeoManager->GetMedium("TPC_Air");
 131   TGeoVolume *v1 = new TGeoVolume("TPC_M",tpc,m1);
 132   //
 133   // drift volume - sensitive volume, extended beyond the
 134   // endcaps, because of the alignment
 135   //
 136   TGeoPcon *dvol = new TGeoPcon(0.,360.,6);
 137   dvol->DefineSection(0,-260.,74.5,264.4);
 138   dvol->DefineSection(1,-253.6,74.5,264.4);
 139   //
 140   dvol->DefineSection(2,-253.6,76.6774,258.);
 141   dvol->DefineSection(3,253.6,76.6774,258.);
 142   //
 143   dvol->DefineSection(4,253.6,74.5,264.4);
 144   dvol->DefineSection(5,260.,74.5,264.4);
 145   //
 146   TGeoMedium *m5 = gGeoManager->GetMedium("TPC_Ne-CO2-N-2");
 147   TGeoVolume *v9 = new TGeoVolume("TPC_Drift",dvol,m5);
 148   //
 149   v1->AddNode(v9,1);
 150   //
 151   // outer insulator
 152   //
 153   TGeoPcon *tpco = new TGeoPcon(0.,360.,6); //insulator
 154   //
 155   tpco->DefineSection(0,-256.6,264.8,278.);
 156   tpco->DefineSection(1,-253.6,264.8,278.);
 157   //
 158   tpco->DefineSection(2,-253.6,258.,278.);
 159   tpco->DefineSection(3,250.6,258.,278.);
 160   //
 161   tpco->DefineSection(4,250.6,258.,275.5);
 162   tpco->DefineSection(5,253.6,258.,275.5);
 163   //
 164   TGeoMedium *m2 = gGeoManager->GetMedium("TPC_CO2");
 165   TGeoVolume *v2 = new TGeoVolume("TPC_OI",tpco,m2);
 166   //
 167   // outer containment vessel
 168   //
 169   TGeoPcon *tocv = new TGeoPcon(0.,360.,6);  // containment vessel
 170   //
 171   tocv->DefineSection(0,-256.6,264.8,278.);
 172   tocv->DefineSection(1,-253.6,264.8,278.);
 173   //
 174   tocv->DefineSection(2,-253.6,274.8124,278.);
 175   tocv->DefineSection(3,247.6,274.8124,278.);
 176   //
 177   tocv->DefineSection(4,247.6,270.4,278.);
 178   tocv->DefineSection(5,250.6,270.4,278.);
 179   //
 180   TGeoMedium *m3 = gGeoManager->GetMedium("TPC_Al");
 181   TGeoVolume *v3 = new TGeoVolume("TPC_OCV",tocv,m3);
 182   //
 183   TGeoTube *to1 = new TGeoTube(274.8174,277.995,252.1); //epoxy
 184   TGeoTube *to2 = new TGeoTube(274.8274,277.985,252.1); //tedlar
 185   TGeoTube *to3 = new TGeoTube(274.8312,277.9812,252.1);//prepreg2
 186   TGeoTube *to4 = new TGeoTube(274.9062,277.9062,252.1);//nomex
 187   //
 188   TGeoMedium *sm1 = gGeoManager->GetMedium("TPC_Epoxy");
 189   TGeoMedium *sm2 = gGeoManager->GetMedium("TPC_Tedlar");
 190   TGeoMedium *sm3 = gGeoManager->GetMedium("TPC_Prepreg2");
 191   TGeoMedium *sm4 = gGeoManager->GetMedium("TPC_Nomex");
 192   //
 193   TGeoVolume *tov1 = new TGeoVolume("TPC_OCV1",to1,sm1);
 194   TGeoVolume *tov2 = new TGeoVolume("TPC_OCV2",to2,sm2);
 195   TGeoVolume *tov3 = new TGeoVolume("TPC_OCV3",to3,sm3);
 196   TGeoVolume *tov4 = new TGeoVolume("TPC_OCV4",to4,sm4);
 197  //-------------------------------------------------------
 198   //  Tpc Outer Field Cage
 199   //  daughters - composite (sandwich)
 200   //-------------------------------------------------------
 201
 202   TGeoPcon *tofc = new TGeoPcon(0.,360.,6);
 203   //
 204   tofc->DefineSection(0,-253.6,258.,269.6);
 205   tofc->DefineSection(1,-250.6,258.,269.6);
 206   //
 207   tofc->DefineSection(2,-250.6,258.,260.0676);
 208   tofc->DefineSection(3,250.6,258.,260.0676);
 209   //
 210   tofc->DefineSection(4,250.6,258.,275.5);
 211   tofc->DefineSection(5,253.6,258.,275.5);
 212   //
 213   TGeoVolume *v4 = new TGeoVolume("TPC_TOFC",tofc,m3);
 214   //sandwich
 215   TGeoTube *tf1 = new TGeoTube(258.0,260.0676,252.1); //tedlar
 216   TGeoTube *tf2 = new TGeoTube(258.0038,260.0638,252.1); //prepreg3
 217   TGeoTube *tf3 = new TGeoTube(258.0338,260.0338,252.1);//nomex
 218   //
 219   TGeoMedium *sm5 = gGeoManager->GetMedium("TPC_Prepreg3");
 220   //
 221   TGeoVolume *tf1v = new TGeoVolume("TPC_OFC1",tf1,sm2);
 222   TGeoVolume *tf2v = new TGeoVolume("TPC_OFC2",tf2,sm5);
 223   TGeoVolume *tf3v = new TGeoVolume("TPC_OFC3",tf3,sm4);
 224   //
 225   // outer part - positioning
 226   //
 227   tov1->AddNode(tov2,1); tov2->AddNode(tov3,1); tov3->AddNode(tov4,1);
 228   //
 229   tf1v->AddNode(tf2v,1); tf2v->AddNode(tf3v,1);
 230   //
 231   v3->AddNode(tov1,1,new TGeoTranslation(0.,0.,-1.5)); v4->AddNode(tf1v,1);
 232   //
 233   v2->AddNode(v3,1); v2->AddNode(v4,1);
 234   //
 235   v1->AddNode(v2,1);
 236   //--------------------------------------------------------------------
 237   // Tpc Inner INsulator (CO2)
 238   // the cones, the central drum and the inner f.c. sandwich with a piece
 239   // of the flane will be placed in the TPC
 240   //--------------------------------------------------------------------
 241   TGeoPcon *tpci = new TGeoPcon(0.,360.,4);
 242   //
 243   tpci->DefineSection(0,-253.6,68.4,76.6774);
 244   tpci->DefineSection(1,-74.0,61.2,76.6774);
 245   //
 246   tpci->DefineSection(2,74.0,61.2,76.6774);
 247   //
 248   tpci->DefineSection(3,253.6,65.9,76.6774);
 249   //
 250   TGeoVolume *v5 = new TGeoVolume("TPC_INI",tpci,m2);
 251   //
 252   // now the inner field cage - only part of flanges (2 copies)
 253   //
 254   TGeoTube *tif1 = new TGeoTube(69.9,76.6774,1.5);
 255   TGeoVolume *v6 = new TGeoVolume("TPC_IFC1",tif1,m3);
 256   //
 257  //---------------------------------------------------------
 258   // Tpc Inner Containment vessel - Muon side
 259   //---------------------------------------------------------
 260   TGeoPcon *tcms = new TGeoPcon(0.,360.,10);
 261   //
 262   tcms->DefineSection(0,-259.1,68.1,74.2);
 263   tcms->DefineSection(1,-253.6,68.1,74.2);
 264   //
 265   tcms->DefineSection(2,-253.6,68.1,68.4);
 266   tcms->DefineSection(3,-74.0,60.9,61.2);
 267   //
 268   tcms->DefineSection(4,-74.0,60.1,61.2);
 269   tcms->DefineSection(5,-73.3,60.1,61.2);
 270   //
 271   tcms->DefineSection(6,-73.3,56.9,61.2);
 272   tcms->DefineSection(7,-73.0,56.9,61.2);
 273   //
 274   tcms->DefineSection(8,-73.0,56.9,58.8);
 275   tcms->DefineSection(9,-71.3,56.9,58.8);
 276   //
 277   TGeoVolume *v7 = new TGeoVolume("TPC_ICVM",tcms,m3);
 278   //-----------------------------------------------
 279   // inner containment vessel - shaft side
 280   //-----------------------------------------------
 281   TGeoPcon *tcss = new TGeoPcon(0.,360.,10);
 282   //
 283   tcss->DefineSection(0,71.3,56.9,58.8);
 284   tcss->DefineSection(1,73.0,56.9,58.8);
 285   //
 286   tcss->DefineSection(2,73.0,56.9,61.2);
 287   tcss->DefineSection(3,73.3,56.9,61.2);
 288   //
 289   tcss->DefineSection(4,73.3,60.1,61.2);
 290   tcss->DefineSection(5,74.0,60.1,61.2);
 291   //
 292   tcss->DefineSection(6,74.0,60.9,61.2);
 293   tcss->DefineSection(7,253.6,65.6,65.9);
 294   //
 295   tcss->DefineSection(8,253.6,65.6,74.2);
 296   tcss->DefineSection(9,258.1,65.6,74.2);
 297   //
 298   TGeoVolume *v8 = new TGeoVolume("TPC_ICVS",tcss,m3);
 299   //-----------------------------------------------
 300   //  Inner field cage
 301   //  define 4 parts and make an assembly
 302   //-----------------------------------------------
 303   // part1 - Al - 2 copies
 304   TGeoTube *t1 = new TGeoTube(76.6774,78.845,0.75);
 305   TGeoVolume *tv1 = new TGeoVolume("TPC_IFC2",t1,m3);
 306   // sandwich - outermost parts - 2 copies
 307   TGeoTube *t2 = new TGeoTube(76.6774,78.845,74.175); // tedlar 38 microns
 308   TGeoTube *t3 = new TGeoTube(76.6812,78.8412,74.175); // prepreg2 500 microns
 309   TGeoTube *t4 = new TGeoTube(76.7312,78.7912,74.175); // prepreg3 300 microns
 310   TGeoTube *t5 = new TGeoTube(76.7612,78.7612,74.175); // nomex 2 cm
 311   //
 312   TGeoVolume *tv2 = new TGeoVolume("TPC_IFC3",t2,sm2);
 313   TGeoVolume *tv3 = new TGeoVolume("TPC_IFC4",t3,sm3);
 314   TGeoVolume *tv4 = new TGeoVolume("TPC_IFC5",t4,sm5);
 315   TGeoVolume *tv5 = new TGeoVolume("TPC_IFC6",t5,sm4);
 316   //
 317   // middle parts - 2 copies
 318   TGeoTube *t6 = new TGeoTube(76.6774,78.795,5.); // tedlar 38 microns
 319   TGeoTube *t7 = new TGeoTube(76.6812,78.7912,5.); // prepreg2 250 microns
 320   TGeoTube *t8 = new TGeoTube(76.7062,78.7662,5.); // prepreg3 300 microns
 321   TGeoTube *t9 = new TGeoTube(76.7362,78.7362,5.); // nomex 2 cm
 322   //
 323   TGeoVolume *tv6 = new TGeoVolume("TPC_IFC7",t6,sm2);
 324   TGeoVolume *tv7 = new TGeoVolume("TPC_IFC8",t7,sm3);
 325   TGeoVolume *tv8 = new TGeoVolume("TPC_IFC9",t8,sm5);
 326   TGeoVolume *tv9 = new TGeoVolume("TPC_IFC10",t9,sm4);
 327   // central part - 1 copy
 328   TGeoTube *t10 = new TGeoTube(76.6774,78.745,93.75); // tedlar 38 microns
 329   TGeoTube *t11 = new TGeoTube(76.6812,78.7412,93.75); // prepreg3 300 microns
 330   TGeoTube *t12 = new TGeoTube(76.7112,78.7112,93.75); // nomex 2 cm
 331   //
 332   TGeoVolume *tv10 = new TGeoVolume("TPC_IFC11",t10,sm2);
 333   TGeoVolume *tv11 = new TGeoVolume("TPC_IFC12",t11,sm5);
 334   TGeoVolume *tv12 = new TGeoVolume("TPC_IFC13",t12,sm4);
 335   //
 336   // inner part - positioning
 337   //
 338   // creating a sandwich
 339   tv2->AddNode(tv3,1); tv3->AddNode(tv4,1); tv4->AddNode(tv5,1);
 340   //
 341   tv6->AddNode(tv7,1); tv7->AddNode(tv8,1); tv8->AddNode(tv9,1);
 342   //
 343   tv10->AddNode(tv11,1); tv11->AddNode(tv12,1);
 344   //
 345   TGeoVolumeAssembly *tv100 = new TGeoVolumeAssembly("TPC_IFC");
 346   //
 347   tv100->AddNode(tv10,1);
 348   tv100->AddNode(tv6,1,new TGeoTranslation(0.,0.,-98.75));
 349   tv100->AddNode(tv6,2,new TGeoTranslation(0.,0.,98.75));
 350   tv100->AddNode(tv2,1,new TGeoTranslation(0.,0.,-177.925));
 351   tv100->AddNode(tv2,2,new TGeoTranslation(0.,0.,177.925));
 352   tv100->AddNode(tv1,1,new TGeoTranslation(0.,0.,-252.85));
 353   tv100->AddNode(tv1,2,new TGeoTranslation(0.,0.,252.85));
 354   //
 355   v5->AddNode(v6,1, new TGeoTranslation(0.,0.,-252.1));
 356   v5->AddNode(v6,2, new TGeoTranslation(0.,0.,252.1));
 357   v1->AddNode(v5,1); v1->AddNode(v7,1); v1->AddNode(v8,1);
 358   v9->AddNode(tv100,1);
 359   //
 360   // central drum
 361   //
 362   // flange + sandwich
 363   //
 364   TGeoPcon *cfl = new TGeoPcon(0.,360.,6);
 365   cfl->DefineSection(0,-71.1,59.7,61.2);
 366   cfl->DefineSection(1,-68.6,59.7,61.2);
 367   //
 368   cfl->DefineSection(2,-68.6,60.6324,61.2);
 369   cfl->DefineSection(3,68.6,60.6324,61.2);
 370   //
 371   cfl->DefineSection(4,68.6,59.7,61.2);
 372   cfl->DefineSection(5,71.1,59.7,61.2);
 373   //
 374   TGeoVolume *cflv = new TGeoVolume("TPC_CDR",cfl,m3);
 375   // sandwich
 376   TGeoTube *cd1 = new TGeoTube(60.6424,61.19,71.1);
 377   TGeoTube *cd2 = new TGeoTube(60.6462,61.1862,71.1);
 378   TGeoTube *cd3 = new TGeoTube(60.6662,61.1662,71.1);
 379   //
 380   TGeoMedium *sm6 = gGeoManager->GetMedium("TPC_Prepreg1");
 381   TGeoVolume *cd1v = new TGeoVolume("TPC_CDR1",cd1,sm2); //tedlar
 382   TGeoVolume *cd2v = new TGeoVolume("TPC_CDR2",cd2,sm6);// prepreg1
 383   TGeoVolume *cd3v = new TGeoVolume("TPC_CDR3",cd3,sm4); //nomex
 384   //
 385   // seals for central drum 2 copies
 386   //
 387   TGeoTube *cs = new TGeoTube(56.9,61.2,0.1);
 388   TGeoMedium *sm7 = gGeoManager->GetMedium("TPC_Mylar");
 389   TGeoVolume *csv = new TGeoVolume("TPC_CDRS",cs,sm7);
 390   v1->AddNode(csv,1,new TGeoTranslation(0.,0.,-71.));
 391   v1->AddNode(csv,2,new TGeoTranslation(0.,0.,71.));
 392   //
 393   // seal collars
 394   TGeoPcon *se = new TGeoPcon(0.,360.,6);
 395   se->DefineSection(0,-72.8,59.7,61.2);
 396   se->DefineSection(1,-72.3,59.7,61.2);
 397   //
 398   se->DefineSection(2,-72.3,58.85,61.2);
 399   se->DefineSection(3,-71.6,58.85,61.2);
 400   //
 401   se->DefineSection(4,-71.6,59.7,61.2);
 402   se->DefineSection(5,-71.3,59.7,61.2);
 403   //
 404   TGeoVolume *sev = new TGeoVolume("TPC_CDCE",se,m3);
 405   //
 406   TGeoTube *si = new TGeoTube(56.9,58.8,1.);
 407   TGeoVolume *siv = new TGeoVolume("TPC_CDCI",si,m3);
 408   //
 409   // define reflection matrix
 410   //
 411   TGeoRotation *ref = new TGeoRotation("ref",90.,0.,90.,90.,180.,0.);
 412   //
 413   cd1v->AddNode(cd2v,1); cd2v->AddNode(cd3v,1); cflv->AddNode(cd1v,1);
 414   //
 415   v1->AddNode(siv,1,new TGeoTranslation(0.,0.,-69.9));
 416   v1->AddNode(siv,2,new TGeoTranslation(0.,0.,69.9));
 417   v1->AddNode(sev,1); v1->AddNode(sev,2,ref); v1->AddNode(cflv,1);
 418   //
 419   // central membrane - 2 rings and a mylar membrane - assembly
 420   //
 421   TGeoTube *ih = new TGeoTube(81.05,84.05,0.3);
 422   TGeoTube *oh = new TGeoTube(250.,256.,.5);
 423   TGeoTube *mem = new TGeoTube(84.05,250,0.01);
 424   TGeoVolume *ihv = new TGeoVolume("TPC_IHVH",ih,m3);
 425   TGeoVolume *ohv = new TGeoVolume("TPC_OHVH",oh,m3);
 426   TGeoVolume *memv = new TGeoVolume("TPC_HV",mem,sm7);
 427   //
 428   TGeoVolumeAssembly *cm = new TGeoVolumeAssembly("TPC_HVMEM");
 429   cm->AddNode(ihv,1);
 430   cm->AddNode(ohv,1);
 431   cm->AddNode(memv,1);
 432   v9->AddNode(cm,1);
 433   //
 434   // end caps - they are make as an assembly of single segments
 435   // containing both readout chambers
 436   //
 437   Double_t openingAngle = 10.*TMath::DegToRad();
 438   Double_t thick=1.5; // rib
 439   Double_t shift = thick/TMath::Sin(openingAngle);
 440   //
 441   Double_t lowEdge = 86.3; // hole in the wheel
 442   Double_t upEdge = 240.4; // hole in the wheel
 443   //
 444   new TGeoTubeSeg("sec",74.5,264.4,3.,0.,20.);
 445   //
 446   TGeoPgon *hole = new TGeoPgon("hole",0.,20.,1,4);
 447   //
 448   hole->DefineSection(0,-3.5,lowEdge-shift,upEdge-shift);
 449   hole->DefineSection(1,-1.5,lowEdge-shift,upEdge-shift);
 450   //
 451   hole->DefineSection(2,-1.5,lowEdge-shift,upEdge+3.-shift);
 452   hole->DefineSection(3,3.5,lowEdge-shift,upEdge+3.-shift);
 453   //
 454   Double_t ys = shift*TMath::Sin(openingAngle);
 455   Double_t xs = shift*TMath::Cos(openingAngle);
 456   TGeoTranslation *tr = new TGeoTranslation("tr",xs,ys,0.);
 457   tr->RegisterYourself();
 458   TGeoCompositeShape *chamber = new TGeoCompositeShape("sec-hole:tr");
 459   TGeoVolume *sv = new TGeoVolume("TPC_WSEG",chamber,m3);
 460   TGeoPgon *bar = new TGeoPgon("bar",0.,20.,1,2);
 461   bar->DefineSection(0,-3.,131.5-shift,136.5-shift);
 462   bar->DefineSection(1,1.5,131.5-shift,136.5-shift);
 463   TGeoVolume *barv = new TGeoVolume("TPC_WBAR",bar,m3);
 464   TGeoVolumeAssembly *ch = new TGeoVolumeAssembly("TPC_WCH");//empty segment
 465   //
 466   ch->AddNode(sv,1); ch->AddNode(barv,1,tr);
 467   //
 468   // readout chambers
 469   //
 470   // IROC first
 471   //
 472    TGeoTrd1 *ibody = new TGeoTrd1(13.8742,21.3328,4.29,21.15);
 473    TGeoVolume *ibdv = new TGeoVolume("TPC_IROCB",ibody,m3);
 474   // empty space
 475    TGeoTrd1 *emp = new TGeoTrd1(12.3742,19.8328,3.99,19.65);
 476    TGeoVolume *empv = new TGeoVolume("TPC_IROCE",emp,m1);
 477    ibdv->AddNode(empv,1,new TGeoTranslation(0.,-0.3,0.));
 478    //bars
 479    Double_t tga = (19.8328-12.3742)/39.3;
 480    Double_t xmin,xmax;
 481    xmin = 9.55*tga+12.3742;
 482    xmax = 9.95*tga+12.3742;
 483    TGeoTrd1 *ib1 = new TGeoTrd1(xmin,xmax,3.29,0.2);
 484    TGeoVolume *ib1v = new TGeoVolume("TPC_IRB1",ib1,m3);
 485    empv->AddNode(ib1v,1,new TGeoTranslation("tt1",0.,0.7,-9.9));
 486    xmin=19.4*tga+12.3742;
 487    xmax=19.9*tga+12.3742;
 488    TGeoTrd1 *ib2 = new TGeoTrd1(xmin,xmax,3.29,0.25);
 489    TGeoVolume *ib2v = new TGeoVolume("TPC_TRB2",ib2,m3);
 490    empv->AddNode(ib2v,1,new TGeoTranslation(0.,0.7,0.));
 491    xmin=29.35*tga+12.3742;
 492    xmax=29.75*tga+12.3742;
 493    TGeoTrd1 *ib3 = new TGeoTrd1(xmin,xmax,3.29,0.2);
 494    TGeoVolume *ib3v = new TGeoVolume("TPC_IRB3",ib3,m3);
 495    empv->AddNode(ib3v,1,new TGeoTranslation(0.,0.7,9.9));
 496    //
 497    // holes for connectors
 498    //
 499    TGeoBBox *conn = new TGeoBBox(0.4,0.3,4.675); // identical for iroc and oroc
 500    TGeoVolume *connv = new TGeoVolume("TPC_RCCON",conn,m1);
 501    TString fileName(gSystem->Getenv("ALICE_ROOT"));
 502    fileName += "/TPC/conn_iroc.dat";
 503    ifstream in;
 504    in.open(fileName.Data(), ios_base::in); // asci file
 505    for(Int_t i =0;i<86;i++){
 506       Double_t y = 3.99;
 507       Double_t x,z,ang;
 508       in>>x>>z>>ang;
 509       z-=26.5;
 510       TGeoRotation *rrr = new TGeoRotation();
 511       rrr->RotateY(ang);
 512       TGeoCombiTrans *trans = new TGeoCombiTrans("trans",x,y,z,rrr);
 513       ibdv->AddNode(connv,i+1,trans);
 514    }
 515    in.close();
 516    // "cap"
 517    new TGeoTrd1("icap",14.5974,23.3521,1.19,24.825);
 518    // "hole"
 519    new TGeoTrd1("ihole",13.8742,21.3328,1.2,21.15);
 520    TGeoTranslation *tr1 = new TGeoTranslation("tr1",0.,0.,1.725);
 521    tr1->RegisterYourself();
 522    TGeoCompositeShape *ic = new TGeoCompositeShape("icap-ihole:tr1");
 523    TGeoVolume *icv = new TGeoVolume("TPC_IRCAP",ic,m3);
 524    //
 525    // pad plane and wire fixations
 526    //
 527    TGeoTrd1 *pp = new TGeoTrd1(14.5974,23.3521,0.3,24.825); //pad+iso
 528    TGeoMedium *m4 = gGeoManager->GetMedium("TPC_G10");
 529    TGeoVolume *ppv = new TGeoVolume("TPC_IRPP",pp,m4);
 530    TGeoPara *f1 = new TGeoPara(.6,.5,24.825,0.,-10.,0.);
 531    TGeoVolume *f1v = new TGeoVolume("TPC_IRF1",f1,m4);
 532    TGeoPara *f2 = new TGeoPara(.6,.5,24.825,0.,10.,0.);
 533    TGeoVolume *f2v = new TGeoVolume("TPC_IRF2",f2,m4);
 534    //
 535    TGeoVolumeAssembly *iroc = new TGeoVolumeAssembly("TPC_IROC");
 536    //
 537    iroc->AddNode(ibdv,1);
 538    iroc->AddNode(icv,1,new TGeoTranslation(0.,3.1,-1.725));
 539    iroc->AddNode(ppv,1,new TGeoTranslation(0.,4.59,-1.725));
 540    tga =(23.3521-14.5974)/49.65;
 541    Double_t xx = 24.825*tga+14.5974-0.6;
 542    iroc->AddNode(f1v,1,new TGeoTranslation(-xx,5.39,-1.725));
 543    iroc->AddNode(f2v,1,new TGeoTranslation(xx,5.39,-1.725));
 544    //
 545    // OROC
 546    //
 547    TGeoTrd1 *obody = new TGeoTrd1(22.2938,40.5084,4.19,51.65);
 548    TGeoVolume *obdv = new TGeoVolume("TPC_OROCB",obody,m3);
 549    TGeoTrd1 *oemp = new TGeoTrd1(20.2938,38.5084,3.89,49.65);
 550    TGeoVolume *oempv = new TGeoVolume("TPC_OROCE",oemp,m1);
 551    obdv->AddNode(oempv,1,new TGeoTranslation(0.,-0.3,0.));
 552    //horizontal bars
 553    tga=(38.5084-20.2938)/99.3;
 554    xmin=tga*10.2+20.2938;
 555    xmax=tga*10.6+20.2938;
 556    TGeoTrd1 *ob1 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 557    TGeoVolume *ob1v = new TGeoVolume("TPC_ORB1",ob1,m3);
 558    //
 559    xmin=22.55*tga+20.2938;
 560    xmax=24.15*tga+20.2938;
 561    TGeoTrd1 *ob2 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 562    TGeoVolume *ob2v = new TGeoVolume("TPC_ORB2",ob2,m3);
 563    //
 564    xmin=36.1*tga+20.2938;
 565    xmax=36.5*tga+20.2938;
 566    TGeoTrd1 *ob3 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 567    TGeoVolume *ob3v = new TGeoVolume("TPC_ORB3",ob3,m3);
 568    //
 569    xmin=49.0*tga+20.2938;
 570    xmax=50.6*tga+20.2938;
 571    TGeoTrd1 *ob4 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 572    TGeoVolume *ob4v = new TGeoVolume("TPC_ORB4",ob4,m3);
 573    //
 574    xmin=63.6*tga+20.2938;
 575    xmax=64.0*tga+20.2938;
 576    TGeoTrd1 *ob5 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 577    TGeoVolume *ob5v = new TGeoVolume("TPC_ORB5",ob5,m3);
 578    //
 579    xmin=75.5*tga+20.2938;
 580    xmax=77.15*tga+20.2938;
 581    TGeoTrd1 *ob6 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 582    TGeoVolume *ob6v = new TGeoVolume("TPC_ORB6",ob6,m3);
 583    //
 584    xmin=88.7*tga+20.2938;
 585    xmax=89.1*tga+20.2938;
 586    TGeoTrd1 *ob7 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 587    TGeoVolume *ob7v = new TGeoVolume("TPC_ORB7",ob7,m3);
 588    //
 589    oempv->AddNode(ob1v,1,new TGeoTranslation(0.,0.975,-39.25));
 590    oempv->AddNode(ob2v,1,new TGeoTranslation(0.,0.975,-26.3));
 591    oempv->AddNode(ob3v,1,new TGeoTranslation(0.,0.975,-13.35));
 592    oempv->AddNode(ob4v,1,new TGeoTranslation(0.,0.975,0.15));
 593    oempv->AddNode(ob5v,1,new TGeoTranslation(0.,0.975,14.15));
 594    oempv->AddNode(ob6v,1,new TGeoTranslation(0.,0.975,26.7));
 595    oempv->AddNode(ob7v,1,new TGeoTranslation(0.,0.975,39.25));
 596    // vertical bars
 597    TGeoBBox *ob8 = new TGeoBBox(0.8,2.915,5.1);
 598    TGeoBBox *ob9 = new TGeoBBox(0.8,2.915,5.975);
 599    TGeoBBox *ob10 = new TGeoBBox(0.8,2.915,5.775);
 600    TGeoBBox *ob11 = new TGeoBBox(0.8,2.915,6.25);
 601    TGeoBBox *ob12 = new TGeoBBox(0.8,2.915,6.5);
 602    //
 603    TGeoVolume *ob8v = new TGeoVolume("TPC_ORB8",ob8,m3);
 604    TGeoVolume *ob9v = new TGeoVolume("TPC_ORB9",ob9,m3);
 605    TGeoVolume *ob10v = new TGeoVolume("TPC_ORB10",ob10,m3);
 606    TGeoVolume *ob11v = new TGeoVolume("TPC_ORB11",ob11,m3);
 607    TGeoVolume *ob12v = new TGeoVolume("TPC_ORB12",ob12,m3);
 608    //
 609    oempv->AddNode(ob8v,1,new TGeoTranslation(0.,0.975,-44.55));
 610    oempv->AddNode(ob8v,2,new TGeoTranslation(0.,0.975,44.55));
 611    oempv->AddNode(ob9v,1,new TGeoTranslation(0.,0.975,-33.075));
 612    oempv->AddNode(ob9v,2,new TGeoTranslation(0.,0.975,-19.525));
 613    oempv->AddNode(ob10v,1,new TGeoTranslation(0.,0.975,20.125));
 614    oempv->AddNode(ob10v,2,new TGeoTranslation(0.,0.975,33.275));
 615    oempv->AddNode(ob11v,1,new TGeoTranslation(0.,0.975,-6.9));
 616    oempv->AddNode(ob12v,1,new TGeoTranslation(0.,0.975,7.45));
 617    //
 618    // holes for connectors
 619    //
 620    fileName = gSystem->Getenv("ALICE_ROOT");
 621    fileName += "/TPC/conn_oroc.dat";
 622    in.open(fileName.Data(), ios_base::in); // asci file
 623    for(Int_t i =0;i<78;i++){
 624       Double_t y =3.89;
 625       Double_t x,z,ang;
 626       Double_t x1,z1,x2,z2;
 627       in>>x>>z>>ang;
 628       Double_t xr = 4.7*TMath::Sin(ang*TMath::DegToRad());
 629       Double_t zr = 4.7*TMath::Cos(ang*TMath::DegToRad());
 630       //
 631       x1=xr+x; x2=-xr+x; z1=zr+z; z2 = -zr+z;
 632       //
 633       TGeoRotation *rr = new TGeoRotation();
 634       rr->RotateY(ang);
 635       z1-=54.95;
 636       z2-=54.95;
 637       TGeoCombiTrans *trans1 = new TGeoCombiTrans("trans1",x1,y,z1,rr);
 638       TGeoCombiTrans *trans2 = new TGeoCombiTrans("trans2",x2,y,z2,rr);
 639       obdv->AddNode(connv,i+1,trans1);
 640       obdv->AddNode(connv,i+79,trans2);
 641    }
 642    in.close();
 643    // cap
 644    new TGeoTrd1("ocap",23.3874,43.5239,1.09,57.1);
 645    new TGeoTrd1("ohole",22.2938,40.5084,1.09,51.65);
 646    TGeoTranslation *tr5 = new TGeoTranslation("tr5",0.,0.,-2.15);
 647    tr5->RegisterYourself();
 648    TGeoCompositeShape *oc = new TGeoCompositeShape("ocap-ohole:tr5");
 649    TGeoVolume *ocv = new TGeoVolume("TPC_ORCAP",oc,m3);
 650    //
 651    // pad plane and wire fixations
 652    //
 653    TGeoTrd1 *opp = new TGeoTrd1(23.3874,43.5239,0.3,57.1);
 654    TGeoVolume *oppv = new TGeoVolume("TPC_ORPP",opp,m4);
 655    //
 656    tga=(43.5239-23.3874)/114.2;
 657    TGeoPara *f3 = new TGeoPara(.7,.6,57.1,0.,-10.,0.);
 658    TGeoPara *f4 = new TGeoPara(.7,.6,57.1,0.,10.,0.);
 659    xx = 57.1*tga+23.3874-0.7;
 660    TGeoVolume *f3v = new TGeoVolume("TPC_ORF1",f3,m4);
 661    TGeoVolume *f4v = new TGeoVolume("TPC_ORF2",f4,m4);
 662    //
 663    TGeoVolumeAssembly *oroc = new TGeoVolumeAssembly("TPC_OROC");
 664    //
 665    oroc->AddNode(obdv,1);
 666    oroc->AddNode(ocv,1,new TGeoTranslation(0.,3.1,2.15));
 667    oroc->AddNode(oppv,1,new TGeoTranslation(0.,4.49,2.15));
 668    oroc->AddNode(f3v,1,new TGeoTranslation(-xx,5.39,2.15));
 669    oroc->AddNode(f4v,1,new TGeoTranslation(xx,5.39,2.15));
 670    //
 671    // now iroc and oroc are placed into a sector...
 672    //
 673    TGeoVolumeAssembly *secta = new TGeoVolumeAssembly("TPC_SECT"); // a-side
 674    TGeoVolumeAssembly *sectc = new TGeoVolumeAssembly("TPC_SECT"); // c-side
 675    TGeoRotation rot1("rot1",90.,90.,0.);
 676    TGeoRotation rot2("rot2");
 677    rot2.RotateY(10.);
 678    TGeoRotation *rot = new TGeoRotation("rot");
 679    *rot=rot1*rot2;
 680    //
 681    Double_t x0,y0;
 682    x0=110.2*TMath::Cos(openingAngle);
 683    y0=110.2*TMath::Sin(openingAngle);
 684    TGeoCombiTrans *combi1a = new TGeoCombiTrans("combi1",x0,y0,1.09+0.195,rot); //a-side
 685    TGeoCombiTrans *combi1c = new TGeoCombiTrans("combi1",x0,y0,1.09+0.222,rot); //c-side
 686    x0=188.45*TMath::Cos(openingAngle);
 687    y0=188.45*TMath::Sin(openingAngle);
 688    TGeoCombiTrans *combi2a = new TGeoCombiTrans("combi2",x0,y0,0.99+0.195,rot); //a-side
 689    TGeoCombiTrans *combi2c = new TGeoCombiTrans("combi2",x0,y0,0.99+0.222,rot); //c-side
 690    //
 691    //
 692    // A-side
 693    //
 694    secta->AddNode(ch,1);
 695    secta->AddNode(iroc,1,combi1a);
 696    secta->AddNode(oroc,1,combi2a);
 697    //
 698    // C-side
 699    //
 700    sectc->AddNode(ch,1);
 701    sectc->AddNode(iroc,1,combi1c);
 702    sectc->AddNode(oroc,1,combi2c);
 703    //
 704    // now I try to make  wheels...
 705    //
 706    TGeoVolumeAssembly *wheela = new TGeoVolumeAssembly("TPC_ENDCAP");
 707    TGeoVolumeAssembly *wheelc = new TGeoVolumeAssembly("TPC_ENDCAP");
 708    //
 709    for(Int_t i =0;i<18;i++){
 710      Double_t phi = (20.*i);
 711      TGeoRotation *r = new TGeoRotation();
 712      r->RotateZ(phi);
 713      wheela->AddNode(secta,i+1,r);
 714      wheelc->AddNode(sectc,i+1,r);
 715
 716    }
 717    // wheels in the drift volume!
 718
 719    TGeoCombiTrans *combi3 = new TGeoCombiTrans("combi3",0.,0.,256.6,ref);
 720    v9->AddNode(wheela,1,combi3);
 721    v9->AddNode(wheelc,2,new TGeoTranslation(0.,0.,-256.6));
 722    //_____________________________________________________________
 723    // service support wheel
 724    //_____________________________________________________________
 725   TGeoPgon *sw = new TGeoPgon(0.,20.,1,2);
 726   sw->DefineSection(0,-4.,80.5,251.75);
 727   sw->DefineSection(1,4.,80.5,251.75);
 728   TGeoVolume *swv = new TGeoVolume("TPC_SWSEG",sw,m3); //Al
 729   //
 730   thick=1.;
 731   shift = thick/TMath::Sin(openingAngle);
 732   TGeoPgon *sh = new TGeoPgon(0.,20.,1,2);
 733   sh->DefineSection(0,-4.,81.5-shift,250.75-shift);
 734   sh->DefineSection(1,4.,81.5-shift,250.75-shift);
 735   TGeoVolume *shv = new TGeoVolume("TPC_SWS1",sh,m1); //Air
 736   //
 737   TGeoMedium *m9 =  gGeoManager->GetMedium("TPC_Si");
 738   TGeoPgon *el = new TGeoPgon(0.,20.,1,2);
 739   el->DefineSection(0,-1.872,81.5-shift,250.75-shift);
 740   el->DefineSection(1,1.872,81.5-shift,250.75-shift);
 741   TGeoVolume *elv = new TGeoVolume("TPC_ELEC",el,m9); //Si
 742   //
 743   shv->AddNode(elv,1);
 744   //
 745   //
 746   ys = shift*TMath::Sin(openingAngle);
 747   xs = shift*TMath::Cos(openingAngle);
 748   swv->AddNode(shv,1,new TGeoTranslation(xs,ys,0.));
 749   // cover
 750   TGeoPgon *co = new TGeoPgon(0.,20.,1,2);
 751   co->DefineSection(0,-0.5,77.,255.25);
 752   co->DefineSection(1,0.5,77.,255.25);
 753   TGeoVolume *cov = new TGeoVolume("TPC_SWC1",co,m3);//Al
 754   // hole in a cover
 755   TGeoPgon *coh = new TGeoPgon(0.,20.,1,2);
 756   shift=4./TMath::Sin(openingAngle);
 757   coh->DefineSection(0,-0.5,85.-shift,247.25-shift);
 758   coh->DefineSection(1,0.5,85.-shift,247.25-shift);
 759   //
 760   TGeoVolume *cohv = new TGeoVolume("TPC_SWC2",coh,m1);
 761   //
 762   ys = shift*TMath::Sin(openingAngle);
 763   xs = shift*TMath::Cos(openingAngle);
 764   cov->AddNode(cohv,1,new TGeoTranslation(xs,ys,0.));
 765   //
 766   // Sector as an Assembly
 767   //
 768   TGeoVolumeAssembly *swhs = new TGeoVolumeAssembly("TPC_SSWSEC");
 769   swhs->AddNode(swv,1);
 770   swhs->AddNode(cov,1,new TGeoTranslation(0.,0.,-4.5));
 771   swhs->AddNode(cov,2,new TGeoTranslation(0.,0.,4.5));
 772   //
 773   // SSW as an Assembly of sectors
 774   //
 775  TGeoVolumeAssembly *swheel = new TGeoVolumeAssembly("TPC_SSWHEEL");
 776    for(Int_t i =0;i<18;i++){
 777      Double_t phi = (20.*i);
 778      TGeoRotation *r = new TGeoRotation();
 779      r->RotateZ(phi);
 780      swheel->AddNode(swhs,i+1,r);
 781    }
 782    v1->AddNode(swheel,1,new TGeoTranslation(0.,0.,-284.6));
 783    v1->AddNode(swheel,2,new TGeoTranslation(0.,0.,284.6));
 784
 785    // sensitive strips - strip "0" is always set
 786    // conditional
 787    Int_t totrows;
 788    totrows = fTPCParam->GetNRowLow() + fTPCParam->GetNRowUp();
 789    Double_t *upar;
 790    upar=NULL;
 791    gGeoManager->Volume("TPC_Strip","PGON",m5->GetId(),upar);
 792    upar=new Double_t [10];
 793    upar[0]=0.;
 794    upar[1]=360.;
 795    upar[2]=18.;
 796    upar[3]=2.;
 797    //
 798    upar[4]=-124.8;
 799    upar[7]=124.8;
 800
 801    Double_t rlow=fTPCParam->GetPadRowRadiiLow(0);
 802
 803    upar[5]=rlow;
 804    upar[6]=rlow+.01;
 805    upar[8]=upar[5];
 806    upar[9]=upar[6];
 807    //
 808    gGeoManager->Node("TPC_Strip",1,"TPC_Drift",0.,0.,124.82,0,kTRUE,upar,10);
 809    gGeoManager->Node("TPC_Strip",totrows+1,
 810                      "TPC_Drift",0.,0.,-124.82,0,kTRUE,upar,10);
 811    //
 812    // now, strips optionally
 813    //
 814    if(fSens){
 815      //lower sectors
 816      for(Int_t i=2;i<fTPCParam->GetNRowLow()+1;i++){
 817        rlow=fTPCParam->GetPadRowRadiiLow(i-1);
 818        upar[5]=rlow;
 819        upar[6]=rlow+.01;
 820        upar[8]=upar[5];
 821        upar[9]=upar[6];
 822        gGeoManager->Node("TPC_Strip",i,
 823                          "TPC_Drift",0.,0.,124.82,0,kTRUE,upar,10);
 824        gGeoManager->Node("TPC_Strip",totrows+i,
 825                          "TPC_Drift",0.,0.,-124.82,0,kTRUE,upar,10);
 826      }
 827      //upper sectors
 828      for(Int_t i=1;i<fTPCParam->GetNRowUp()+1;i++){
 829        rlow=fTPCParam->GetPadRowRadiiUp(i-1);
 830        upar[5]=rlow;
 831        upar[6]=rlow+.01;
 832        upar[8]=upar[5];
 833        upar[9]=upar[6];
 834        gGeoManager->Node("TPC_Strip",i+fTPCParam->GetNRowLow(),
 835                          "TPC_Drift",0.,0.,124.82,0,kTRUE,upar,10);
 836        gGeoManager->Node("TPC_Strip",totrows+i+fTPCParam->GetNRowLow(),
 837                          "TPC_Drift",0.,0.,-124.82,0,kTRUE,upar,10);
 838      }
 839    }//strips
 840   //----------------------------------------------------------
 841   // TPc Support Rods - MAKROLON
 842   //----------------------------------------------------------
 843   TGeoMedium *m6=gGeoManager->GetMedium("TPC_Makrolon");
 844   TGeoMedium *m7=gGeoManager->GetMedium("TPC_Cu");
 845   // upper and lower rods differ in length!
 846   delete [] upar;
 847   upar=NULL;
 848   gGeoManager->Volume("TPC_Rod","TUBE",m6->GetId(),upar);
 849   upar=new Double_t [3];
 850   upar[0]=1.8;
 851   upar[1]=2.2;
 852
 853   //
 854   //HV rods - makrolon + 0.58cm (diameter) Cu
 855   TGeoTube *hvr = new TGeoTube(0.,2.2,126.64);
 856   TGeoTube *hvc = new TGeoTube(0.,0.29,126.64);
 857   //
 858   TGeoVolume *hvrv = new TGeoVolume("TPC_HV_Rod",hvr,m6);
 859   TGeoVolume *hvcv = new TGeoVolume("TPC_HV_Cable",hvc,m7);
 860   hvrv->AddNode(hvcv,1);
 861
 862   for(Int_t i=0;i<18;i++){
 863     Double_t angle,x,y;
 864     Double_t z,r;
 865     angle=TMath::DegToRad()*20.*(Double_t)i;
 866     r=81.5;
 867     x=r * TMath::Cos(angle);
 868     y=r * TMath::Sin(angle);
 869     upar[2]=126.64; //lower
 870     z= 126.96;
 871     if(i==15){
 872       v9->AddNode(hvrv,1,new TGeoTranslation(x,y,z));
 873       v9->AddNode(hvrv,2,new TGeoTranslation(x,y,-z));
 874     }
 875     else{
 876      gGeoManager->Node("TPC_Rod",i+1,"TPC_Drift",x,y,z,0,kTRUE,upar,3);//shaft
 877      gGeoManager->Node("TPC_Rod",i+19,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);//muon
 878     }
 879     r=254.25;
 880     x=r * TMath::Cos(angle);
 881     y=r * TMath::Sin(angle);
 882     upar[2]=126.54; //upper
 883     z=127.06;
 884     gGeoManager->Node("TPC_Rod",i+37,"TPC_Drift",x,y,z,0,kTRUE,upar,3);
 885     gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
 886   }
 887
 888   delete [] upar;
 889
 890   TGeoVolume *alice = gGeoManager->GetVolume("ALIC");
 891   alice->AddNode(v1,1);
 892
 893 } // end of function
 894
 895 //_____________________________________________________________________________
 896 void AliTPCv2::AddAlignableVolumes() const
 897 {
 898   //
 899   // Create entries for alignable volumes associating the symbolic volume
 900   // name with the corresponding volume path. Needs to be syncronized with
 901   // eventual changes in the geometry.
 902   //
 903   SetInnerChambersAlignable();
 904   SetOuterChambersAlignable();
 905 }
 906
 907 //_____________________________________________________________________________
 908 void AliTPCv2::SetInnerChambersAlignable() const
 909 {
 910   //
 911   Int_t modnum = 0;
 912   TString vpstr1 = "ALIC_1/TPC_M_1/TPC_Drift_1/TPC_ENDCAP_1/TPC_SECT_";
 913   TString vpstr2 = "ALIC_1/TPC_M_1/TPC_Drift_1/TPC_ENDCAP_2/TPC_SECT_";
 914   TString vpappend = "/TPC_IROC_1";
 915   TString snstr1="TPC/EndcapA/Sector";
 916   TString snstr2="TPC/EndcapC/Sector";
 917   TString snappend="/InnerChamber";
 918   TString volpath, symname;
 919
 920   for(Int_t cnt=1; cnt<=18; cnt++){
 921     volpath = vpstr1;
 922     volpath += cnt;
 923     volpath += vpappend;
 924     symname = snstr1;
 925     symname += cnt;
 926     symname += snappend;
 927     if(!gGeoManager->SetAlignableEntry(symname.Data(),volpath.Data()))
 928       AliFatal(Form("Alignable entry %s not created. Volume path %s not valid", symname.Data(),volpath.Data()));
 929     //
 930     TGeoPNEntry *alignableEntry = gGeoManager->GetAlignableEntry(symname.Data());
 931     const char *path = alignableEntry->GetTitle();
 932     if (!gGeoManager->cd(path))
 933       AliFatal(Form("Volume path %s not valid!",path));
 934     TGeoHMatrix* globMatrix = gGeoManager->GetCurrentMatrix();
 935     TGeoHMatrix* matTtoL = fTPCParam->Tracking2LocalMatrix(globMatrix,cnt-1);
 936     alignableEntry->SetMatrix(matTtoL);
 937     modnum++;
 938   }
 939
 940   for(Int_t cnt=1; cnt<=18; cnt++){
 941     volpath = vpstr2;
 942     volpath += cnt;
 943     volpath += vpappend;
 944     symname = snstr2;
 945     symname += cnt;
 946     symname += snappend;
 947     if(!gGeoManager->SetAlignableEntry(symname.Data(),volpath.Data()))
 948       AliFatal(Form("Alignable entry %s not created. Volume path %s not valid", symname.Data(),volpath.Data()));
 949     TGeoPNEntry *alignableEntry = gGeoManager->GetAlignableEntry(symname.Data());
 950     const char *path = alignableEntry->GetTitle();
 951     if (!gGeoManager->cd(path))
 952       AliFatal(Form("Volume path %s not valid!",path));
 953     TGeoHMatrix* globMatrix = gGeoManager->GetCurrentMatrix();
 954     TGeoHMatrix* matTtoL = fTPCParam->Tracking2LocalMatrix(globMatrix,18+cnt-1);
 955     alignableEntry->SetMatrix(matTtoL);
 956     modnum++;
 957   }
 958 }
 959
 960 //_____________________________________________________________________________
 961 void AliTPCv2::SetOuterChambersAlignable() const
 962 {
 963   //
 964   Int_t modnum = 0;
 965   TString vpstr1 = "ALIC_1/TPC_M_1/TPC_Drift_1/TPC_ENDCAP_1/TPC_SECT_";
 966   TString vpstr2 = "ALIC_1/TPC_M_1/TPC_Drift_1/TPC_ENDCAP_2/TPC_SECT_";
 967   TString vpappend = "/TPC_OROC_1";
 968   TString snstr1="TPC/EndcapA/Sector";
 969   TString snstr2="TPC/EndcapC/Sector";
 970   TString snappend="/OuterChamber";
 971   TString volpath, symname;
 972
 973   for(Int_t cnt=1; cnt<=18; cnt++){
 974     volpath = vpstr1;
 975     volpath += cnt;
 976     volpath += vpappend;
 977     symname = snstr1;
 978     symname += cnt;
 979     symname += snappend;
 980     if(!gGeoManager->SetAlignableEntry(symname.Data(),volpath.Data()))
 981       AliFatal(Form("Alignable entry %s not created. Volume path %s not valid", symname.Data(),volpath.Data()));
 982     TGeoPNEntry *alignableEntry = gGeoManager->GetAlignableEntry(symname.Data());
 983     const char *path = alignableEntry->GetTitle();
 984     if (!gGeoManager->cd(path))
 985       AliFatal(Form("Volume path %s not valid!",path));
 986     TGeoHMatrix* globMatrix = gGeoManager->GetCurrentMatrix();
 987     TGeoHMatrix* matTtoL = fTPCParam->Tracking2LocalMatrix(globMatrix,36+cnt-1);
 988     alignableEntry->SetMatrix(matTtoL);
 989     modnum++;
 990   }
 991
 992   for(Int_t cnt=1; cnt<=18; cnt++){
 993     volpath = vpstr2;
 994     volpath += cnt;
 995     volpath += vpappend;
 996     symname = snstr2;
 997     symname += cnt;
 998     symname += snappend;
 999     if(!gGeoManager->SetAlignableEntry(symname.Data(),volpath.Data()))
1000       AliFatal(Form("Alignable entry %s not created. Volume path %s not valid", symname.Data(),volpath.Data()));
1001      TGeoPNEntry *alignableEntry = gGeoManager->GetAlignableEntry(symname.Data());
1002     const char *path = alignableEntry->GetTitle();
1003     if (!gGeoManager->cd(path))
1004       AliFatal(Form("Volume path %s not valid!",path));
1005     TGeoHMatrix* globMatrix = gGeoManager->GetCurrentMatrix();
1006     TGeoHMatrix* matTtoL = fTPCParam->Tracking2LocalMatrix(globMatrix,36+18+cnt-1);
1007     alignableEntry->SetMatrix(matTtoL);
1008     modnum++;
1009   }
1010 }
1011
1012 //_____________________________________________________________________________
1013 void AliTPCv2::DrawDetector() const
1014 {
1015   //
1016   // Draw a shaded view of the Time Projection Chamber version 1
1017   //
1018
1019   // Set everything unseen
1020   gMC->Gsatt("*", "seen", -1);
1021   //
1022   // Set ALIC mother transparent
1023   gMC->Gsatt("ALIC","SEEN",0);
1024   //
1025   // Set the volumes visible
1026   //
1027
1028   gMC->Gsatt("TPC ","SEEN",0);
1029   gMC->Gsatt("TOIN","SEEN",1);
1030   gMC->Gsatt("TOIN","COLO",7);
1031   gMC->Gsatt("TOCV","SEEN",1);
1032   gMC->Gsatt("TOCV","COLO",4);
1033   gMC->Gsatt("TSA1","SEEN",0);
1034   gMC->Gsatt("TSA2","SEEN",0);
1035   gMC->Gsatt("TSA3","SEEN",0);
1036   gMC->Gsatt("TSA4","SEEN",0);
1037   gMC->Gsatt("TSA5","SEEN",0);
1038   gMC->Gsatt("TOFC","SEEN",1);
1039   gMC->Gsatt("TOFC","COLO",4);
1040   gMC->Gsatt("TSA6","SEEN",0);
1041   gMC->Gsatt("TSA7","SEEN",0);
1042   gMC->Gsatt("TSA8","SEEN",0);
1043   gMC->Gsatt("TIIN","SEEN",1);
1044   gMC->Gsatt("TIIN","COLO",7);
1045   gMC->Gsatt("TII1","SEEN",0);
1046   gMC->Gsatt("TIFC","SEEN",1);
1047   gMC->Gsatt("TIFC","COLO",4);
1048   gMC->Gsatt("TSA9","SEEN",0);
1049   gMC->Gsatt("TS10","SEEN",0);
1050   gMC->Gsatt("TS11","SEEN",0);
1051   gMC->Gsatt("TS12","SEEN",0);
1052   gMC->Gsatt("TS13","SEEN",0);
1053   gMC->Gsatt("TS14","SEEN",0);
1054   gMC->Gsatt("TICC","SEEN",0);
1055   gMC->Gsatt("TICM","SEEN",0);
1056   gMC->Gsatt("TS15","SEEN",0);
1057   gMC->Gsatt("TS16","SEEN",0);
1058   gMC->Gsatt("TS17","SEEN",0);
1059   gMC->Gsatt("TS18","SEEN",0);
1060   gMC->Gsatt("TS19","SEEN",0);
1061   gMC->Gsatt("TPJ1","SEEN",0);
1062   gMC->Gsatt("TPJ2","SEEN",0);
1063   gMC->Gsatt("TICS","SEEN",0);
1064   gMC->Gsatt("TDGN","SEEN",0);
1065   gMC->Gsatt("TIRC","SEEN",0);
1066   gMC->Gsatt("TIC1","SEEN",1);
1067   gMC->Gsatt("TIPP","SEEN",0);
1068   gMC->Gsatt("TIC3","SEEN",0);
1069   gMC->Gsatt("TRCE","SEEN",0);
1070   gMC->Gsatt("TPSC","SEEN",0);
1071   gMC->Gsatt("TPCC","SEEN",0);
1072   gMC->Gsatt("TORC","SEEN",0);
1073   gMC->Gsatt("TOPP","SEEN",0);
1074   gMC->Gsatt("TOC3","SEEN",0);
1075   gMC->Gsatt("TOC1","SEEN",1);
1076   gMC->Gsatt("TSSW","SEEN",1);
1077   gMC->Gsatt("TSWC","SEEN",1);
1078   gMC->Gsatt("TSSW","COLO",3);
1079   gMC->Gsatt("TSWC","COLO",3);
1080   gMC->Gsatt("TSCE","COLO",6);
1081   gMC->Gsatt("TSCE","SEEN",1);
1082   gMC->Gsatt("TWES","SEEN",0);
1083   gMC->Gsatt("TSWB","SEEN",0);
1084   gMC->Gsatt("TPEL","SEEN",0);
1085   gMC->Gsatt("TPMW","SEEN",1);
1086   gMC->Gsatt("TESR","SEEN",1);
1087   gMC->Gsatt("TPMW","COLO",12);
1088   gMC->Gsatt("TIC1","COLO",5);
1089   gMC->Gsatt("TOC1","COLO",5);
1090   gMC->Gsatt("TESB","SEEN",0);
1091   gMC->Gsatt("THVM","SEEN",1);
1092   gMC->Gsatt("THVM","COLO",11);
1093   gMC->Gsatt("THVH","SEEN",0);
1094   gMC->Gsatt("TPSR","SEEN",0);
1095   gMC->Gsatt("THVL","SEEN",0);
1096   gMC->Gsatt("THVC","SEEN",0);
1097   gMC->Gsatt("THVE","SEEN",0);
1098   gMC->Gsatt("THVR","SEEN",0);
1099   gMC->Gsatt("TPSS","SEEN",0);
1100   gMC->Gsatt("TPUS","SEEN",0);
1101   gMC->Gsatt("TPLS","SEEN",0);
1102
1103   //
1104   gMC->Gdopt("hide", "on");
1105   gMC->Gdopt("shad", "on");
1106   gMC->Gsatt("*", "fill", 7);
1107   gMC->SetClipBox(".");
1108   gMC->SetClipBox("TPMW",-300,300,-300,300,254.,270.);
1109   gMC->SetClipBox("TESR",-300,300,-300,300,254.,270.);
1110   gMC->SetClipBox("TSSW",-300,300,-300,300,283.,284.);
1111   gMC->SetClipBox("TSWC",-300,300,-300,300,283.,284.);
1112   gMC->SetClipBox("*", 0, 300, -300, 300, -290, 290);
1113   gMC->DefaultRange();
1114   gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025);
1115   gMC->Gdhead(1111, "Time Projection Chamber");
1116   gMC->Gdman(18, 4, "MAN");
1117   gMC->Gdopt("hide","off");
1118 }
1119
1120 //_____________________________________________________________________________
1121 void AliTPCv2::CreateMaterials()
1122 {
1123   //
1124   // Define materials for version 2 of the Time Projection Chamber
1125   //
1126
1127   AliTPC::CreateMaterials();
1128 }
1129
1130 //_____________________________________________________________________________
1131 void AliTPCv2::Init()
1132 {
1133   //
1134   // Initialises version 2 of the TPC after that it has been built
1135   //
1136
1137   Int_t *idtmed = fIdtmed->GetArray();
1138
1139   AliTPC::Init();
1140
1141
1142   fIdSens=gMC->VolId("TPC_Strip");  // one strip is always selected...
1143
1144   fIDrift=gMC->VolId("TPC_Drift");
1145   fSecOld=-100; // fake number
1146
1147   gMC->SetMaxNStep(30000); // max. number of steps increased
1148
1149   if (fPrimaryIonisation) {
1150       gMC->Gstpar(idtmed[2],"PRIMIO_E", 20.77); // 1st ionisation potential
1151
1152       gMC->Gstpar(idtmed[2],"PRIMIO_N", 14.35);
1153       gMC->Gstpar(idtmed[2],"LOSS", 14); // specific energy loss
1154   } else {
1155       gMC->Gstpar(idtmed[2],"LOSS", 5); // specific energy loss
1156   }
1157
1158
1159   AliInfo("*** TPC version 2 initialized ***");
1160   AliInfo(Form("Maximum number of steps = %d",gMC->GetMaxNStep()));
1161
1162   //
1163
1164 }
1165
1166 //_____________________________________________________________________________
1167 void AliTPCv2::StepManager()
1168 {
1169   //
1170   // Called for every step in the Time Projection Chamber
1171   //
1172
1173   //
1174   // parameters used for the energy loss calculations
1175   //
1176   const Float_t kprim = 14.35; // number of primary collisions per 1 cm
1177   const Float_t kpoti = 20.77e-9; // first ionization potential for Ne/CO2
1178   const Float_t kwIon = 35.97e-9; // energy for the ion-electron pair creation
1179
1180
1181   const Float_t kbig = 1.e10;
1182
1183   Int_t id,copy;
1184   Float_t hits[5];
1185   Int_t vol[2];
1186   TLorentzVector p;
1187
1188   vol[1]=0; // preset row number to 0
1189   //
1190   if (fPrimaryIonisation) gMC->SetMaxStep(kbig);
1191
1192   if(!gMC->IsTrackAlive()) return; // particle has disappeared
1193
1194   Float_t charge = gMC->TrackCharge();
1195
1196   if(TMath::Abs(charge)<=0.) return; // take only charged particles
1197
1198   // check the sensitive volume
1199
1200   id = gMC->CurrentVolID(copy); // vol ID and copy number (starts from 1!)
1201   if(id != fIDrift && id != fIdSens) return; // not in the sensitive folume
1202
1203   gMC->TrackPosition(p);
1204   Double_t r = TMath::Sqrt(p[0]*p[0]+p[1]*p[1]);
1205   //
1206
1207   //
1208   Double_t angle = TMath::ACos(p[0]/r);
1209   angle = (p[1]<0.) ? TMath::TwoPi()-angle : angle;
1210   //
1211   // angular segment, it is not a real sector number...
1212   //
1213   Int_t sector=TMath::Nint((angle-fTPCParam->GetInnerAngleShift())/
1214                fTPCParam->GetInnerAngle());
1215   // rotate to segment "0"
1216   Float_t cos,sin;
1217   fTPCParam->AdjustCosSin(sector,cos,sin);
1218   Float_t x1=p[0]*cos + p[1]*sin;
1219   // check if within sector's limits
1220   if(x1>=fTPCParam->GetInnerRadiusLow()&&x1<=fTPCParam->GetInnerRadiusUp()
1221      ||x1>=fTPCParam->GetOuterRadiusLow()&&x1<=fTPCParam->GetOuterRadiusUp()){
1222   // calculate real sector number...
1223   if (x1>fTPCParam->GetOuterRadiusLow()){
1224     sector = TMath::Nint((angle-fTPCParam->GetOuterAngleShift())/
1225              fTPCParam->GetOuterAngle())+fTPCParam->GetNInnerSector();
1226     if (p[2]<0)         sector+=(fTPCParam->GetNOuterSector()>>1);
1227   }
1228     else
1229       if (p[2]<0) sector+=(fTPCParam->GetNInnerSector()>>1);
1230   //
1231   // here I have a sector number
1232   //
1233
1234   vol[0]=sector;
1235   // check if change of sector
1236   if(sector != fSecOld){
1237     fSecOld=sector;
1238     // add track reference
1239     AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber(), AliTrackReference::kTPC);
1240   }
1241   // track is in the sensitive strip
1242   if(id == fIdSens){
1243     // track is entering the strip
1244     if (gMC->IsTrackEntering()){
1245       Int_t totrows = fTPCParam->GetNRowLow()+fTPCParam->GetNRowUp();
1246       vol[1] = (copy<=totrows) ? copy-1 : copy-1-totrows;
1247       // row numbers are autonomous for lower and upper sectors
1248       if(vol[0] > fTPCParam->GetNInnerSector()) {
1249         vol[1] -= fTPCParam->GetNRowLow();
1250       }
1251     //
1252       if(vol[0]<fTPCParam->GetNInnerSector()&&vol[1] == 0){
1253
1254         // lower sector, row 0, because Jouri wants to have this
1255
1256         gMC->TrackMomentum(p);
1257         hits[0]=p[0];
1258         hits[1]=p[1];
1259         hits[2]=p[2];
1260         hits[3]=0.; // this hit has no energy loss
1261         // Get also the track time for pileup simulation
1262         hits[4]=gMC->TrackTime();
1263
1264         AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits);
1265       }
1266     //
1267
1268        gMC->TrackPosition(p);
1269        hits[0]=p[0];
1270        hits[1]=p[1];
1271        hits[2]=p[2];
1272        hits[3]=0.; // this hit has no energy loss
1273        // Get also the track time for pileup simulation
1274        hits[4]=gMC->TrackTime();
1275
1276        AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits);
1277
1278     }
1279     else return;
1280   }
1281   //-----------------------------------------------------------------
1282   //  charged particle is in the sensitive drift volume
1283   //-----------------------------------------------------------------
1284   if(gMC->TrackStep() > 0) {
1285     Int_t nel=0;
1286     if (!fPrimaryIonisation) {
1287       nel = (Int_t)(((gMC->Edep())-kpoti)/kwIon) + 1;
1288     }
1289     else {
1290           Float_t edep = gMC->Edep();
1291           if (edep > 0.) nel = (Int_t)((gMC->Edep()*1.5)/kwIon) + 1;
1292     }
1293     nel=TMath::Min(nel,300); // 300 electrons corresponds to 10 keV
1294     //
1295     gMC->TrackPosition(p);
1296     hits[0]=p[0];
1297     hits[1]=p[1];
1298     hits[2]=p[2];
1299     hits[3]=(Float_t)nel;
1300
1301     // Add this hit
1302
1303     if (fHitType&&2){
1304       gMC->TrackMomentum(p);
1305       Float_t momentum = TMath::Sqrt(p[0]*p[0]+p[1]*p[1]);
1306       Float_t precision =   (momentum>0.1) ? 0.002 :0.01;
1307       fTrackHits->SetHitPrecision(precision);
1308     }
1309
1310     // Get also the track time for pileup simulation
1311     hits[4]=gMC->TrackTime();
1312
1313     AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits);
1314
1315   } // step>0
1316   } //within sector's limits
1317   // Stemax calculation for the next step
1318
1319   Float_t pp;
1320   TLorentzVector mom;
1321   // below is valid only for Geant3 (fPromaryIonisation not set)
1322   if(!fPrimaryIonisation){
1323     gMC->TrackMomentum(mom);
1324     Float_t ptot=mom.Rho();
1325     Float_t betaGamma = ptot/gMC->TrackMass();
1326
1327     Int_t pid=gMC->TrackPid();
1328     if((pid==kElectron || pid==kPositron) && ptot > 0.002)
1329       {
1330         pp = kprim*1.58; // electrons above 20 MeV/c are on the plateau!
1331       }
1332     else
1333       {
1334
1335         betaGamma = TMath::Max(betaGamma,(Float_t)7.e-3); // protection against too small bg
1336         pp=kprim*BetheBloch(betaGamma);
1337
1338         if(TMath::Abs(charge) > 1.) pp *= (charge*charge);
1339     }
1340
1341     Double_t rnd = gMC->GetRandom()->Rndm();
1342
1343     gMC->SetMaxStep(-TMath::Log(rnd)/pp);
1344   }
1345
1346 }
1347
1348 //_____________________________________________________________________________
1349 Float_t AliTPCv2::BetheBloch(Float_t bg)
1350 {
1351   //
1352   // Bethe-Bloch energy loss formula
1353   //
1354   const Double_t kp1=0.76176e-1;
1355   const Double_t kp2=10.632;
1356   const Double_t kp3=0.13279e-4;
1357   const Double_t kp4=1.8631;
1358   const Double_t kp5=1.9479;
1359
1360   Double_t dbg = (Double_t) bg;
1361
1362   Double_t beta = dbg/TMath::Sqrt(1.+dbg*dbg);
1363
1364   Double_t aa = TMath::Power(beta,kp4);
1365   Double_t bb = TMath::Power(1./dbg,kp5);
1366
1367   bb=TMath::Log(kp3+bb);
1368
1369   return ((Float_t)((kp2-aa-bb)*kp1/aa));
1370 }
1371
1372