TPC/AliTPCv4.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 /*
  17 $Log$
  18 Revision 1.1  2007/06/24 20:56:19  hristov
  19 TPC version for the krypton runs (Marek)
  20
  21 */
  22
  23 //
  24 ///////////////////////////////////////////////////////////////////////////////
  25 //                                                                           //
  26 //  Time Projection Chamber version 4 -- detailed TPC and slow simulation    //
  27 //  of Krypton  decays                                                       //
  28 //                                                                           //
  29 //Begin_Html                                                                 //
  30 /*
  31 <img src="picts/AliTPCv2Class.gif">
  32 */
  33 //End_Html
  34 //                                                                           //
  35 //                                                                           //
  36 ///////////////////////////////////////////////////////////////////////////////
  37
  38 //#include <stdlib.h>
  39
  40 #include <TLorentzVector.h>
  41 #include <TPDGCode.h>
  42 #include <TString.h>
  43 #include "AliLog.h"
  44 #include "AliTPCParam.h"
  45 #include "AliTPCTrackHitsV2.h"
  46 #include "AliTPCv4.h"
  47 #include "TGeoVolume.h"
  48 #include "TGeoPcon.h"
  49 #include "TGeoTube.h"
  50 #include "TGeoPgon.h"
  51 #include "TGeoTrd1.h"
  52 #include "TGeoCompositeShape.h"
  53 #include "TGeoPara.h"
  54 #include "TGeoPhysicalNode.h"
  55
  56 ClassImp(AliTPCv4)
  57
  58 //_____________________________________________________________________________
  59 AliTPCv4::AliTPCv4(const char *name, const char *title) :
  60   AliTPC(name, title),
  61   fIdSens(0),
  62   fIDrift(0),
  63   fSecOld(0)
  64 {
  65   //
  66   // Standard constructor for Time Projection Chamber version 2
  67   //
  68
  69
  70   SetBufferSize(128000);
  71
  72
  73   if (fTPCParam)
  74      fTPCParam->Write(fTPCParam->GetTitle());
  75 }
  76
  77 //_____________________________________________________________________________
  78 void AliTPCv4::CreateGeometry()
  79 {
  80   //
  81   // Create the geometry of Time Projection Chamber version 2
  82   //
  83   //Begin_Html
  84   /*
  85     <img src="picts/AliTPC.gif">
  86   */
  87   //End_Html
  88   //Begin_Html
  89   /*
  90     <img src="picts/AliTPCv2Tree.gif">
  91   */
  92   //End_Html
  93
  94   //----------------------------------------------------------
  95   // This geometry is written using TGeo class
  96   // Firstly the shapes are defined, and only then the volumes
  97   // What is recognized by the MC are volumes
  98   //----------------------------------------------------------
  99   //
 100   //  tpc - this will be the mother volume
 101   //
 102
 103   //
 104   // here I define a volume TPC
 105   // retrive the medium name with "TPC_" as a leading string
 106   //
 107   TGeoPcon *tpc = new TGeoPcon(0.,360.,20); //20 sections
 108   //
 109   tpc->DefineSection(0,-291.,77.,278.);
 110   tpc->DefineSection(1,-270,77.,278.);
 111   //
 112   tpc->DefineSection(2,-270.,77.,278.);
 113   tpc->DefineSection(3,-259.6,70.,278.);
 114   //
 115   tpc->DefineSection(4,-259.6,68.1,278.);
 116   tpc->DefineSection(5,-253.6,68.1,278.);
 117   //
 118   tpc->DefineSection(6,-253.6,68.,278.);
 119   tpc->DefineSection(7,-74.0,60.8,278.);
 120   //
 121   tpc->DefineSection(8,-74.0,60.1,278.);
 122   tpc->DefineSection(9,-73.3,60.1,278.);
 123   //
 124   tpc->DefineSection(10,-73.3,56.9,278.);
 125   tpc->DefineSection(11,73.3,56.9,278.);
 126   //
 127   tpc->DefineSection(12,73.3,60.1,278.);
 128   tpc->DefineSection(13,74.0,60.1,278.);
 129   //
 130   tpc->DefineSection(14,74.0,60.8,278.);
 131   tpc->DefineSection(15,253.6,65.5,278.);
 132   //
 133   tpc->DefineSection(16,253.6,65.6,278.);
 134   tpc->DefineSection(17,259.6,65.6,278.);
 135   //
 136   tpc->DefineSection(18,259.6,70.0,278.);
 137   tpc->DefineSection(19,291.,77.,278.);
 138   //
 139   TGeoMedium *m1 = gGeoManager->GetMedium("TPC_Air");
 140   TGeoVolume *v1 = new TGeoVolume("TPC_M",tpc,m1);
 141   //
 142   // drift volume - sensitive volume, extended beyond the
 143   // endcaps, because of the alignment
 144   //
 145   TGeoPcon *dvol = new TGeoPcon(0.,360.,6);
 146   dvol->DefineSection(0,-260.,74.5,264.4);
 147   dvol->DefineSection(1,-253.6,74.5,264.4);
 148   //
 149   dvol->DefineSection(2,-253.6,76.6774,258.);
 150   dvol->DefineSection(3,253.6,76.6774,258.);
 151   //
 152   dvol->DefineSection(4,253.6,74.5,264.4);
 153   dvol->DefineSection(5,260.,74.5,264.4);
 154   //
 155   TGeoMedium *m5 = gGeoManager->GetMedium("TPC_Ne-CO2-N-3");
 156   TGeoVolume *v9 = new TGeoVolume("TPC_Drift",dvol,m5);
 157   //
 158   v1->AddNode(v9,1);
 159   //
 160   // outer insulator
 161   //
 162   TGeoPcon *tpco = new TGeoPcon(0.,360.,6); //insulator
 163   //
 164   tpco->DefineSection(0,-256.6,264.8,278.);
 165   tpco->DefineSection(1,-253.6,264.8,278.);
 166   //
 167   tpco->DefineSection(2,-253.6,258.,278.);
 168   tpco->DefineSection(3,250.6,258.,278.);
 169   //
 170   tpco->DefineSection(4,250.6,258.,275.5);
 171   tpco->DefineSection(5,253.6,258.,275.5);
 172   //
 173   TGeoMedium *m2 = gGeoManager->GetMedium("TPC_CO2");
 174   TGeoVolume *v2 = new TGeoVolume("TPC_OI",tpco,m2);
 175   //
 176   // outer containment vessel
 177   //
 178   TGeoPcon *tocv = new TGeoPcon(0.,360.,6);  // containment vessel
 179   //
 180   tocv->DefineSection(0,-256.6,264.8,278.);
 181   tocv->DefineSection(1,-253.6,264.8,278.);
 182   //
 183   tocv->DefineSection(2,-253.6,274.8124,278.);
 184   tocv->DefineSection(3,247.6,274.8124,278.);
 185   //
 186   tocv->DefineSection(4,247.6,270.4,278.);
 187   tocv->DefineSection(5,250.6,270.4,278.);
 188   //
 189   TGeoMedium *m3 = gGeoManager->GetMedium("TPC_Al");
 190   TGeoVolume *v3 = new TGeoVolume("TPC_OCV",tocv,m3);
 191   //
 192   TGeoTube *to1 = new TGeoTube(274.8174,277.995,252.1); //epoxy
 193   TGeoTube *to2 = new TGeoTube(274.8274,277.985,252.1); //tedlar
 194   TGeoTube *to3 = new TGeoTube(274.8312,277.9812,252.1);//prepreg2
 195   TGeoTube *to4 = new TGeoTube(274.9062,277.9062,252.1);//nomex
 196   //
 197   TGeoMedium *sm1 = gGeoManager->GetMedium("TPC_Epoxy");
 198   TGeoMedium *sm2 = gGeoManager->GetMedium("TPC_Tedlar");
 199   TGeoMedium *sm3 = gGeoManager->GetMedium("TPC_Prepreg2");
 200   TGeoMedium *sm4 = gGeoManager->GetMedium("TPC_Nomex");
 201   //
 202   TGeoVolume *tov1 = new TGeoVolume("TPC_OCV1",to1,sm1);
 203   TGeoVolume *tov2 = new TGeoVolume("TPC_OCV2",to2,sm2);
 204   TGeoVolume *tov3 = new TGeoVolume("TPC_OCV3",to3,sm3);
 205   TGeoVolume *tov4 = new TGeoVolume("TPC_OCV4",to4,sm4);
 206  //-------------------------------------------------------
 207   //  Tpc Outer Field Cage
 208   //  daughters - composite (sandwich)
 209   //-------------------------------------------------------
 210
 211   TGeoPcon *tofc = new TGeoPcon(0.,360.,6);
 212   //
 213   tofc->DefineSection(0,-253.6,258.,269.6);
 214   tofc->DefineSection(1,-250.6,258.,269.6);
 215   //
 216   tofc->DefineSection(2,-250.6,258.,260.0676);
 217   tofc->DefineSection(3,250.6,258.,260.0676);
 218   //
 219   tofc->DefineSection(4,250.6,258.,275.5);
 220   tofc->DefineSection(5,253.6,258.,275.5);
 221   //
 222   TGeoVolume *v4 = new TGeoVolume("TPC_TOFC",tofc,m3);
 223   //sandwich
 224   TGeoTube *tf1 = new TGeoTube(258.0,260.0676,252.1); //tedlar
 225   TGeoTube *tf2 = new TGeoTube(258.0038,260.0638,252.1); //prepreg3
 226   TGeoTube *tf3 = new TGeoTube(258.0338,260.0338,252.1);//nomex
 227   //
 228   TGeoMedium *sm5 = gGeoManager->GetMedium("TPC_Prepreg3");
 229   //
 230   TGeoVolume *tf1v = new TGeoVolume("TPC_OFC1",tf1,sm2);
 231   TGeoVolume *tf2v = new TGeoVolume("TPC_OFC2",tf2,sm5);
 232   TGeoVolume *tf3v = new TGeoVolume("TPC_OFC3",tf3,sm4);
 233   //
 234   // outer part - positioning
 235   //
 236   tov1->AddNode(tov2,1); tov2->AddNode(tov3,1); tov3->AddNode(tov4,1);
 237   //
 238   tf1v->AddNode(tf2v,1); tf2v->AddNode(tf3v,1);
 239   //
 240   v3->AddNode(tov1,1,new TGeoTranslation(0.,0.,-1.5)); v4->AddNode(tf1v,1);
 241   //
 242   v2->AddNode(v3,1); v2->AddNode(v4,1);
 243   //
 244   v1->AddNode(v2,1);
 245   //--------------------------------------------------------------------
 246   // Tpc Inner INsulator (CO2)
 247   // the cones, the central drum and the inner f.c. sandwich with a piece
 248   // of the flane will be placed in the TPC
 249   //--------------------------------------------------------------------
 250   TGeoPcon *tpci = new TGeoPcon(0.,360.,4);
 251   //
 252   tpci->DefineSection(0,-253.6,68.4,76.6774);
 253   tpci->DefineSection(1,-74.0,61.2,76.6774);
 254   //
 255   tpci->DefineSection(2,74.0,61.2,76.6774);
 256   //
 257   tpci->DefineSection(3,253.6,65.9,76.6774);
 258   //
 259   TGeoVolume *v5 = new TGeoVolume("TPC_INI",tpci,m2);
 260   //
 261   // now the inner field cage - only part of flanges (2 copies)
 262   //
 263   TGeoTube *tif1 = new TGeoTube(69.9,76.6774,1.5);
 264   TGeoVolume *v6 = new TGeoVolume("TPC_IFC1",tif1,m3);
 265   //
 266  //---------------------------------------------------------
 267   // Tpc Inner Containment vessel - Muon side
 268   //---------------------------------------------------------
 269   TGeoPcon *tcms = new TGeoPcon(0.,360.,10);
 270   //
 271   tcms->DefineSection(0,-259.1,68.1,74.2);
 272   tcms->DefineSection(1,-253.6,68.1,74.2);
 273   //
 274   tcms->DefineSection(2,-253.6,68.1,68.4);
 275   tcms->DefineSection(3,-74.0,60.9,61.2);
 276   //
 277   tcms->DefineSection(4,-74.0,60.1,61.2);
 278   tcms->DefineSection(5,-73.3,60.1,61.2);
 279   //
 280   tcms->DefineSection(6,-73.3,56.9,61.2);
 281   tcms->DefineSection(7,-73.0,56.9,61.2);
 282   //
 283   tcms->DefineSection(8,-73.0,56.9,58.8);
 284   tcms->DefineSection(9,-71.3,56.9,58.8);
 285   //
 286   TGeoVolume *v7 = new TGeoVolume("TPC_ICVM",tcms,m3);
 287   //-----------------------------------------------
 288   // inner containment vessel - shaft side
 289   //-----------------------------------------------
 290   TGeoPcon *tcss = new TGeoPcon(0.,360.,10);
 291   //
 292   tcss->DefineSection(0,71.3,56.9,58.8);
 293   tcss->DefineSection(1,73.0,56.9,58.8);
 294   //
 295   tcss->DefineSection(2,73.0,56.9,61.2);
 296   tcss->DefineSection(3,73.3,56.9,61.2);
 297   //
 298   tcss->DefineSection(4,73.3,60.1,61.2);
 299   tcss->DefineSection(5,74.0,60.1,61.2);
 300   //
 301   tcss->DefineSection(6,74.0,60.9,61.2);
 302   tcss->DefineSection(7,253.6,65.6,65.9);
 303   //
 304   tcss->DefineSection(8,253.6,65.6,74.2);
 305   tcss->DefineSection(9,258.1,65.6,74.2);
 306   //
 307   TGeoVolume *v8 = new TGeoVolume("TPC_ICVS",tcss,m3);
 308   //-----------------------------------------------
 309   //  Inner field cage
 310   //  define 4 parts and make an assembly
 311   //-----------------------------------------------
 312   // part1 - Al - 2 copies
 313   TGeoTube *t1 = new TGeoTube(76.6774,78.845,0.75);
 314   TGeoVolume *tv1 = new TGeoVolume("TPC_IFC2",t1,m3);
 315   // sandwich - outermost parts - 2 copies
 316   TGeoTube *t2 = new TGeoTube(76.6774,78.845,74.175); // tedlar 38 microns
 317   TGeoTube *t3 = new TGeoTube(76.6812,78.8412,74.175); // prepreg2 500 microns
 318   TGeoTube *t4 = new TGeoTube(76.7312,78.7912,74.175); // prepreg3 300 microns
 319   TGeoTube *t5 = new TGeoTube(76.7612,78.7612,74.175); // nomex 2 cm
 320   //
 321   TGeoVolume *tv2 = new TGeoVolume("TPC_IFC3",t2,sm2);
 322   TGeoVolume *tv3 = new TGeoVolume("TPC_IFC4",t3,sm3);
 323   TGeoVolume *tv4 = new TGeoVolume("TPC_IFC5",t4,sm5);
 324   TGeoVolume *tv5 = new TGeoVolume("TPC_IFC6",t5,sm4);
 325   //
 326   // middle parts - 2 copies
 327   TGeoTube *t6 = new TGeoTube(76.6774,78.795,5.); // tedlar 38 microns
 328   TGeoTube *t7 = new TGeoTube(76.6812,78.7912,5.); // prepreg2 250 microns
 329   TGeoTube *t8 = new TGeoTube(76.7062,78.7662,5.); // prepreg3 300 microns
 330   TGeoTube *t9 = new TGeoTube(76.7362,78.7362,5.); // nomex 2 cm
 331   //
 332   TGeoVolume *tv6 = new TGeoVolume("TPC_IFC7",t6,sm2);
 333   TGeoVolume *tv7 = new TGeoVolume("TPC_IFC8",t7,sm3);
 334   TGeoVolume *tv8 = new TGeoVolume("TPC_IFC9",t8,sm5);
 335   TGeoVolume *tv9 = new TGeoVolume("TPC_IFC10",t9,sm4);
 336   // central part - 1 copy
 337   TGeoTube *t10 = new TGeoTube(76.6774,78.745,93.75); // tedlar 38 microns
 338   TGeoTube *t11 = new TGeoTube(76.6812,78.7412,93.75); // prepreg3 300 microns
 339   TGeoTube *t12 = new TGeoTube(76.7112,78.7112,93.75); // nomex 2 cm
 340   //
 341   TGeoVolume *tv10 = new TGeoVolume("TPC_IFC11",t10,sm2);
 342   TGeoVolume *tv11 = new TGeoVolume("TPC_IFC12",t11,sm5);
 343   TGeoVolume *tv12 = new TGeoVolume("TPC_IFC13",t12,sm4);
 344   //
 345   // inner part - positioning
 346   //
 347   // creating a sandwich
 348   tv2->AddNode(tv3,1); tv3->AddNode(tv4,1); tv4->AddNode(tv5,1);
 349   //
 350   tv6->AddNode(tv7,1); tv7->AddNode(tv8,1); tv8->AddNode(tv9,1);
 351   //
 352   tv10->AddNode(tv11,1); tv11->AddNode(tv12,1);
 353   //
 354   TGeoVolumeAssembly *tv100 = new TGeoVolumeAssembly("TPC_IFC");
 355   //
 356   tv100->AddNode(tv10,1);
 357   tv100->AddNode(tv6,1,new TGeoTranslation(0.,0.,-98.75));
 358   tv100->AddNode(tv6,2,new TGeoTranslation(0.,0.,98.75));
 359   tv100->AddNode(tv2,1,new TGeoTranslation(0.,0.,-177.925));
 360   tv100->AddNode(tv2,2,new TGeoTranslation(0.,0.,177.925));
 361   tv100->AddNode(tv1,1,new TGeoTranslation(0.,0.,-252.85));
 362   tv100->AddNode(tv1,2,new TGeoTranslation(0.,0.,252.85));
 363   //
 364   v5->AddNode(v6,1, new TGeoTranslation(0.,0.,-252.1));
 365   v5->AddNode(v6,2, new TGeoTranslation(0.,0.,252.1));
 366   v1->AddNode(v5,1); v1->AddNode(v7,1); v1->AddNode(v8,1);
 367   v9->AddNode(tv100,1);
 368   //
 369   // central drum
 370   //
 371   // flange + sandwich
 372   //
 373   TGeoPcon *cfl = new TGeoPcon(0.,360.,6);
 374   cfl->DefineSection(0,-71.1,59.7,61.2);
 375   cfl->DefineSection(1,-68.6,59.7,61.2);
 376   //
 377   cfl->DefineSection(2,-68.6,60.6324,61.2);
 378   cfl->DefineSection(3,68.6,60.6324,61.2);
 379   //
 380   cfl->DefineSection(4,68.6,59.7,61.2);
 381   cfl->DefineSection(5,71.1,59.7,61.2);
 382   //
 383   TGeoVolume *cflv = new TGeoVolume("TPC_CDR",cfl,m3);
 384   // sandwich
 385   TGeoTube *cd1 = new TGeoTube(60.6424,61.19,71.1);
 386   TGeoTube *cd2 = new TGeoTube(60.6462,61.1862,71.1);
 387   TGeoTube *cd3 = new TGeoTube(60.6662,61.1662,71.1);
 388   //
 389   TGeoMedium *sm6 = gGeoManager->GetMedium("TPC_Prepreg1");
 390   TGeoVolume *cd1v = new TGeoVolume("TPC_CDR1",cd1,sm2); //tedlar
 391   TGeoVolume *cd2v = new TGeoVolume("TPC_CDR2",cd2,sm6);// prepreg1
 392   TGeoVolume *cd3v = new TGeoVolume("TPC_CDR3",cd3,sm4); //nomex
 393   //
 394   // seals for central drum 2 copies
 395   //
 396   TGeoTube *cs = new TGeoTube(56.9,61.2,0.1);
 397   TGeoMedium *sm7 = gGeoManager->GetMedium("TPC_Mylar");
 398   TGeoVolume *csv = new TGeoVolume("TPC_CDRS",cs,sm7);
 399   v1->AddNode(csv,1,new TGeoTranslation(0.,0.,-71.2));
 400   v1->AddNode(csv,2,new TGeoTranslation(0.,0.,71.2));
 401   //
 402   // seal collars
 403   TGeoPcon *se = new TGeoPcon(0.,360.,6);
 404   se->DefineSection(0,-72.8,59.7,61.2);
 405   se->DefineSection(1,-72.3,59.7,61.2);
 406   //
 407   se->DefineSection(2,-72.3,58.85,61.2);
 408   se->DefineSection(3,-71.6,58.85,61.2);
 409   //
 410   se->DefineSection(4,-71.6,59.7,61.2);
 411   se->DefineSection(5,-71.3,59.7,61.2);
 412   //
 413   TGeoVolume *sev = new TGeoVolume("TPC_CDCE",se,m3);
 414   //
 415   TGeoTube *si = new TGeoTube(56.9,58.8,1.);
 416   TGeoVolume *siv = new TGeoVolume("TPC_CDCI",si,m3);
 417   //
 418   // define reflection matrix
 419   //
 420   TGeoRotation *ref = new TGeoRotation("ref",90.,0.,90.,90.,180.,0.);
 421   //
 422   cd1v->AddNode(cd2v,1); cd2v->AddNode(cd3v,1); cflv->AddNode(cd1v,1);
 423   //
 424   v1->AddNode(siv,1,new TGeoTranslation(0.,0.,-69.9));
 425   v1->AddNode(siv,2,new TGeoTranslation(0.,0.,69.9));
 426   v1->AddNode(sev,1); v1->AddNode(sev,2,ref); v1->AddNode(cflv,1);
 427   //
 428   // central membrane - 2 rings and a mylar membrane - assembly
 429   //
 430   TGeoTube *ih = new TGeoTube(81.05,84.05,0.3);
 431   TGeoTube *oh = new TGeoTube(250.,256.,.5);
 432   TGeoTube *mem = new TGeoTube(84.05,250,0.01);
 433   TGeoVolume *ihv = new TGeoVolume("TPC_IHVH",ih,m3);
 434   TGeoVolume *ohv = new TGeoVolume("TPC_OHVH",oh,m3);
 435   TGeoVolume *memv = new TGeoVolume("TPC_HV",mem,sm7);
 436   //
 437   TGeoVolumeAssembly *cm = new TGeoVolumeAssembly("TPC_HVMEM");
 438   cm->AddNode(ihv,1);
 439   cm->AddNode(ohv,1);
 440   cm->AddNode(memv,1);
 441   v9->AddNode(cm,1);
 442   //
 443   // end caps - they are make as an assembly of single segments
 444   // containing both readout chambers
 445   //
 446   Double_t openingAngle = 10.*TMath::DegToRad();
 447   Double_t thick=1.5; // rib
 448   Double_t shift = thick/TMath::Sin(openingAngle);
 449   //
 450   Double_t lowEdge = 86.3; // hole in the wheel
 451   Double_t upEdge = 240.4; // hole in the wheel
 452   //
 453   new TGeoTubeSeg("sec",74.5,264.4,3.,0.,20.);
 454   //
 455   TGeoPgon *hole = new TGeoPgon("hole",0.,20.,1,4);
 456   //
 457   hole->DefineSection(0,-3.5,lowEdge-shift,upEdge-shift);
 458   hole->DefineSection(1,-1.5,lowEdge-shift,upEdge-shift);
 459   //
 460   hole->DefineSection(2,-1.5,lowEdge-shift,upEdge+3.-shift);
 461   hole->DefineSection(3,3.5,lowEdge-shift,upEdge+3.-shift);
 462   //
 463   Double_t ys = shift*TMath::Sin(openingAngle);
 464   Double_t xs = shift*TMath::Cos(openingAngle);
 465   TGeoTranslation *tr = new TGeoTranslation("tr",xs,ys,0.);
 466   tr->RegisterYourself();
 467   TGeoCompositeShape *chamber = new TGeoCompositeShape("sec-hole:tr");
 468   TGeoVolume *sv = new TGeoVolume("TPC_WSEG",chamber,m3);
 469   TGeoPgon *bar = new TGeoPgon("bar",0.,20.,1,2);
 470   bar->DefineSection(0,-3.,131.5-shift,136.5-shift);
 471   bar->DefineSection(1,1.5,131.5-shift,136.5-shift);
 472   TGeoVolume *barv = new TGeoVolume("TPC_WBAR",bar,m3);
 473   TGeoVolumeAssembly *ch = new TGeoVolumeAssembly("TPC_WCH");//empty segment
 474   //
 475   ch->AddNode(sv,1); ch->AddNode(barv,1,tr);
 476   //
 477   // readout chambers
 478   //
 479   // IROC first
 480   //
 481    TGeoTrd1 *ibody = new TGeoTrd1(13.8742,21.3328,4.29,21.15);
 482    TGeoVolume *ibdv = new TGeoVolume("TPC_IROCB",ibody,m3);
 483   // empty space
 484    TGeoTrd1 *emp = new TGeoTrd1(12.3742,19.8328,3.99,19.65);
 485    TGeoVolume *empv = new TGeoVolume("TPC_IROCE",emp,m1);
 486    ibdv->AddNode(empv,1,new TGeoTranslation(0.,-0.3,0.));
 487    //bars
 488    Double_t tga = (19.8328-12.3742)/39.3;
 489    Double_t xmin,xmax;
 490    xmin = 9.55*tga+12.3742;
 491    xmax = 9.95*tga+12.3742;
 492    TGeoTrd1 *ib1 = new TGeoTrd1(xmin,xmax,3.29,0.2);
 493    TGeoVolume *ib1v = new TGeoVolume("TPC_IRB1",ib1,m3);
 494    empv->AddNode(ib1v,1,new TGeoTranslation("tt1",0.,0.7,-9.9));
 495    xmin=19.4*tga+12.3742;
 496    xmax=19.9*tga+12.3742;
 497    TGeoTrd1 *ib2 = new TGeoTrd1(xmin,xmax,3.29,0.25);
 498    TGeoVolume *ib2v = new TGeoVolume("TPC_TRB2",ib2,m3);
 499    empv->AddNode(ib2v,1,new TGeoTranslation(0.,0.7,0.));
 500    xmin=29.35*tga+12.3742;
 501    xmax=29.75*tga+12.3742;
 502    TGeoTrd1 *ib3 = new TGeoTrd1(xmin,xmax,3.29,0.2);
 503    TGeoVolume *ib3v = new TGeoVolume("TPC_IRB3",ib3,m3);
 504    empv->AddNode(ib3v,1,new TGeoTranslation(0.,0.7,9.9));
 505    //
 506    // holes for connectors
 507    //
 508    TGeoBBox *conn = new TGeoBBox(0.4,0.3,4.675); // identical for iroc and oroc
 509    TGeoVolume *connv = new TGeoVolume("TPC_RCCON",conn,m1);
 510    TString fileName(gSystem->Getenv("ALICE_ROOT"));
 511    fileName += "/TPC/conn_iroc.dat";
 512    ifstream in;
 513    in.open(fileName.Data(), ios_base::in); // asci file
 514    for(Int_t i =0;i<86;i++){
 515       Double_t y = 3.99;
 516       Double_t x,z,ang;
 517       in>>x>>z>>ang;
 518       z-=26.5;
 519       TGeoRotation *rrr = new TGeoRotation();
 520       rrr->RotateY(ang);
 521       TGeoCombiTrans *trans = new TGeoCombiTrans("trans",x,y,z,rrr);
 522       ibdv->AddNode(connv,i+1,trans);
 523    }
 524    in.close();
 525    // "cap"
 526    new TGeoTrd1("icap",14.5974,23.3521,1.19,24.825);
 527    // "hole"
 528    new TGeoTrd1("ihole",13.8742,21.3328,1.2,21.15);
 529    TGeoTranslation *tr1 = new TGeoTranslation("tr1",0.,0.,1.725);
 530    tr1->RegisterYourself();
 531    TGeoCompositeShape *ic = new TGeoCompositeShape("icap-ihole:tr1");
 532    TGeoVolume *icv = new TGeoVolume("TPC_IRCAP",ic,m3);
 533    //
 534    // pad plane and wire fixations
 535    //
 536    TGeoTrd1 *pp = new TGeoTrd1(14.5974,23.3521,0.3,24.825); //pad+iso
 537    TGeoMedium *m4 = gGeoManager->GetMedium("TPC_G10");
 538    TGeoVolume *ppv = new TGeoVolume("TPC_IRPP",pp,m4);
 539    TGeoPara *f1 = new TGeoPara(.6,.5,24.825,0.,-10.,0.);
 540    TGeoVolume *f1v = new TGeoVolume("TPC_IRF1",f1,m4);
 541    TGeoPara *f2 = new TGeoPara(.6,.5,24.825,0.,10.,0.);
 542    TGeoVolume *f2v = new TGeoVolume("TPC_IRF2",f2,m4);
 543    //
 544    TGeoVolumeAssembly *iroc = new TGeoVolumeAssembly("TPC_IROC");
 545    //
 546    iroc->AddNode(ibdv,1);
 547    iroc->AddNode(icv,1,new TGeoTranslation(0.,3.1,-1.725));
 548    iroc->AddNode(ppv,1,new TGeoTranslation(0.,4.59,-1.725));
 549    tga =(23.3521-14.5974)/49.65;
 550    Double_t xx = 24.825*tga+14.5974-0.6;
 551    iroc->AddNode(f1v,1,new TGeoTranslation(-xx,5.39,-1.725));
 552    iroc->AddNode(f2v,1,new TGeoTranslation(xx,5.39,-1.725));
 553    //
 554    // OROC
 555    //
 556    TGeoTrd1 *obody = new TGeoTrd1(22.2938,40.5084,4.19,51.65);
 557    TGeoVolume *obdv = new TGeoVolume("TPC_OROCB",obody,m3);
 558    TGeoTrd1 *oemp = new TGeoTrd1(20.2938,38.5084,3.89,49.65);
 559    TGeoVolume *oempv = new TGeoVolume("TPC_OROCE",oemp,m1);
 560    obdv->AddNode(oempv,1,new TGeoTranslation(0.,-0.3,0.));
 561    //horizontal bars
 562    tga=(38.5084-20.2938)/99.3;
 563    xmin=tga*10.2+20.2938;
 564    xmax=tga*10.6+20.2938;
 565    TGeoTrd1 *ob1 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 566    TGeoVolume *ob1v = new TGeoVolume("TPC_ORB1",ob1,m3);
 567    //
 568    xmin=22.55*tga+20.2938;
 569    xmax=24.15*tga+20.2938;
 570    TGeoTrd1 *ob2 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 571    TGeoVolume *ob2v = new TGeoVolume("TPC_ORB2",ob2,m3);
 572    //
 573    xmin=36.1*tga+20.2938;
 574    xmax=36.5*tga+20.2938;
 575    TGeoTrd1 *ob3 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 576    TGeoVolume *ob3v = new TGeoVolume("TPC_ORB3",ob3,m3);
 577    //
 578    xmin=49.0*tga+20.2938;
 579    xmax=50.6*tga+20.2938;
 580    TGeoTrd1 *ob4 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 581    TGeoVolume *ob4v = new TGeoVolume("TPC_ORB4",ob4,m3);
 582    //
 583    xmin=63.6*tga+20.2938;
 584    xmax=64.0*tga+20.2938;
 585    TGeoTrd1 *ob5 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 586    TGeoVolume *ob5v = new TGeoVolume("TPC_ORB5",ob5,m3);
 587    //
 588    xmin=75.5*tga+20.2938;
 589    xmax=77.15*tga+20.2938;
 590    TGeoTrd1 *ob6 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 591    TGeoVolume *ob6v = new TGeoVolume("TPC_ORB6",ob6,m3);
 592    //
 593    xmin=88.7*tga+20.2938;
 594    xmax=89.1*tga+20.2938;
 595    TGeoTrd1 *ob7 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 596    TGeoVolume *ob7v = new TGeoVolume("TPC_ORB7",ob7,m3);
 597    //
 598    oempv->AddNode(ob1v,1,new TGeoTranslation(0.,0.975,-39.25));
 599    oempv->AddNode(ob2v,1,new TGeoTranslation(0.,0.975,-26.3));
 600    oempv->AddNode(ob3v,1,new TGeoTranslation(0.,0.975,-13.35));
 601    oempv->AddNode(ob4v,1,new TGeoTranslation(0.,0.975,0.15));
 602    oempv->AddNode(ob5v,1,new TGeoTranslation(0.,0.975,14.15));
 603    oempv->AddNode(ob6v,1,new TGeoTranslation(0.,0.975,26.7));
 604    oempv->AddNode(ob7v,1,new TGeoTranslation(0.,0.975,39.25));
 605    // vertical bars
 606    TGeoBBox *ob8 = new TGeoBBox(0.8,2.915,5.1);
 607    TGeoBBox *ob9 = new TGeoBBox(0.8,2.915,5.975);
 608    TGeoBBox *ob10 = new TGeoBBox(0.8,2.915,5.775);
 609    TGeoBBox *ob11 = new TGeoBBox(0.8,2.915,6.25);
 610    TGeoBBox *ob12 = new TGeoBBox(0.8,2.915,6.5);
 611    //
 612    TGeoVolume *ob8v = new TGeoVolume("TPC_ORB8",ob8,m3);
 613    TGeoVolume *ob9v = new TGeoVolume("TPC_ORB9",ob9,m3);
 614    TGeoVolume *ob10v = new TGeoVolume("TPC_ORB10",ob10,m3);
 615    TGeoVolume *ob11v = new TGeoVolume("TPC_ORB11",ob11,m3);
 616    TGeoVolume *ob12v = new TGeoVolume("TPC_ORB12",ob12,m3);
 617    //
 618    oempv->AddNode(ob8v,1,new TGeoTranslation(0.,0.975,-44.55));
 619    oempv->AddNode(ob8v,2,new TGeoTranslation(0.,0.975,44.55));
 620    oempv->AddNode(ob9v,1,new TGeoTranslation(0.,0.975,-33.075));
 621    oempv->AddNode(ob9v,2,new TGeoTranslation(0.,0.975,-19.525));
 622    oempv->AddNode(ob10v,1,new TGeoTranslation(0.,0.975,20.125));
 623    oempv->AddNode(ob10v,2,new TGeoTranslation(0.,0.975,33.275));
 624    oempv->AddNode(ob11v,1,new TGeoTranslation(0.,0.975,-6.9));
 625    oempv->AddNode(ob12v,1,new TGeoTranslation(0.,0.975,7.45));
 626    //
 627    // holes for connectors
 628    //
 629    fileName = gSystem->Getenv("ALICE_ROOT");
 630    fileName += "/TPC/conn_oroc.dat";
 631    in.open(fileName.Data(), ios_base::in); // asci file
 632    for(Int_t i =0;i<78;i++){
 633       Double_t y =3.89;
 634       Double_t x,z,ang;
 635       Double_t x1,z1,x2,z2;
 636       in>>x>>z>>ang;
 637       Double_t xr = 4.7*TMath::Sin(ang*TMath::DegToRad());
 638       Double_t zr = 4.7*TMath::Cos(ang*TMath::DegToRad());
 639       //
 640       x1=xr+x; x2=-xr+x; z1=zr+z; z2 = -zr+z;
 641       //
 642       TGeoRotation *rr = new TGeoRotation();
 643       rr->RotateY(ang);
 644       z1-=54.95;
 645       z2-=54.95;
 646       TGeoCombiTrans *trans1 = new TGeoCombiTrans("trans1",x1,y,z1,rr);
 647       TGeoCombiTrans *trans2 = new TGeoCombiTrans("trans2",x2,y,z2,rr);
 648       obdv->AddNode(connv,i+1,trans1);
 649       obdv->AddNode(connv,i+79,trans2);
 650    }
 651    in.close();
 652    // cap
 653    new TGeoTrd1("ocap",23.3874,43.5239,1.09,57.1);
 654    new TGeoTrd1("ohole",22.2938,40.5084,1.09,51.65);
 655    TGeoTranslation *tr5 = new TGeoTranslation("tr5",0.,0.,-2.15);
 656    tr5->RegisterYourself();
 657    TGeoCompositeShape *oc = new TGeoCompositeShape("ocap-ohole:tr5");
 658    TGeoVolume *ocv = new TGeoVolume("TPC_ORCAP",oc,m3);
 659    //
 660    // pad plane and wire fixations
 661    //
 662    TGeoTrd1 *opp = new TGeoTrd1(23.3874,43.5239,0.3,57.1);
 663    TGeoVolume *oppv = new TGeoVolume("TPC_ORPP",opp,m4);
 664    //
 665    tga=(43.5239-23.3874)/114.2;
 666    TGeoPara *f3 = new TGeoPara(.7,.6,57.1,0.,-10.,0.);
 667    TGeoPara *f4 = new TGeoPara(.7,.6,57.1,0.,10.,0.);
 668    xx = 57.1*tga+23.3874-0.7;
 669    TGeoVolume *f3v = new TGeoVolume("TPC_ORF1",f3,m4);
 670    TGeoVolume *f4v = new TGeoVolume("TPC_ORF2",f4,m4);
 671    //
 672    TGeoVolumeAssembly *oroc = new TGeoVolumeAssembly("TPC_OROC");
 673    //
 674    oroc->AddNode(obdv,1);
 675    oroc->AddNode(ocv,1,new TGeoTranslation(0.,3.1,2.15));
 676    oroc->AddNode(oppv,1,new TGeoTranslation(0.,4.49,2.15));
 677    oroc->AddNode(f3v,1,new TGeoTranslation(-xx,5.39,2.15));
 678    oroc->AddNode(f4v,1,new TGeoTranslation(xx,5.39,2.15));
 679    //
 680    // now iroc and oroc are placed into a sector...
 681    //
 682    TGeoVolumeAssembly *secta = new TGeoVolumeAssembly("TPC_SECT"); // a-side
 683    TGeoVolumeAssembly *sectc = new TGeoVolumeAssembly("TPC_SECT"); // c-side
 684    TGeoRotation rot1("rot1",90.,90.,0.);
 685    TGeoRotation rot2("rot2");
 686    rot2.RotateY(10.);
 687    TGeoRotation *rot = new TGeoRotation("rot");
 688    *rot=rot1*rot2;
 689    //
 690    Double_t x0,y0;
 691    x0=110.2*TMath::Cos(openingAngle);
 692    y0=110.2*TMath::Sin(openingAngle);
 693    TGeoCombiTrans *combi1a = new TGeoCombiTrans("combi1",x0,y0,1.09+0.195,rot); //a-side
 694    TGeoCombiTrans *combi1c = new TGeoCombiTrans("combi1",x0,y0,1.09+0.222,rot); //c-side
 695    x0=188.45*TMath::Cos(openingAngle);
 696    y0=188.45*TMath::Sin(openingAngle);
 697    TGeoCombiTrans *combi2a = new TGeoCombiTrans("combi2",x0,y0,0.99+0.195,rot); //a-side
 698    TGeoCombiTrans *combi2c = new TGeoCombiTrans("combi2",x0,y0,0.99+0.222,rot); //c-side
 699    //
 700    //
 701    // A-side
 702    //
 703    secta->AddNode(ch,1);
 704    secta->AddNode(iroc,1,combi1a);
 705    secta->AddNode(oroc,1,combi2a);
 706    //
 707    // C-side
 708    //
 709    sectc->AddNode(ch,1);
 710    sectc->AddNode(iroc,1,combi1c);
 711    sectc->AddNode(oroc,1,combi2c);
 712    //
 713    // now I try to make  wheels...
 714    //
 715    TGeoVolumeAssembly *wheela = new TGeoVolumeAssembly("TPC_ENDCAP");
 716    TGeoVolumeAssembly *wheelc = new TGeoVolumeAssembly("TPC_ENDCAP");
 717    //
 718    for(Int_t i =0;i<18;i++){
 719      Double_t phi = (20.*i);
 720      TGeoRotation *r = new TGeoRotation();
 721      r->RotateZ(phi);
 722      wheela->AddNode(secta,i+1,r);
 723      wheelc->AddNode(sectc,i+1,r);
 724
 725    }
 726    // wheels in the drift volume!
 727
 728    TGeoCombiTrans *combi3 = new TGeoCombiTrans("combi3",0.,0.,256.6,ref);
 729    v9->AddNode(wheela,1,combi3);
 730    v9->AddNode(wheelc,2,new TGeoTranslation(0.,0.,-256.6));
 731    //_____________________________________________________________
 732    // service support wheel
 733    //_____________________________________________________________
 734   TGeoPgon *sw = new TGeoPgon(0.,20.,1,2);
 735   sw->DefineSection(0,-4.,80.5,251.75);
 736   sw->DefineSection(1,4.,80.5,251.75);
 737   TGeoVolume *swv = new TGeoVolume("TPC_SWSEG",sw,m3); //Al
 738   //
 739   thick=1.;
 740   shift = thick/TMath::Sin(openingAngle);
 741   TGeoPgon *sh = new TGeoPgon(0.,20.,1,2);
 742   sh->DefineSection(0,-4.,81.5-shift,250.75-shift);
 743   sh->DefineSection(1,4.,81.5-shift,250.75-shift);
 744   TGeoVolume *shv = new TGeoVolume("TPC_SWS1",sh,m1); //Air
 745   //
 746   TGeoMedium *m9 =  gGeoManager->GetMedium("TPC_Si");
 747   TGeoPgon *el = new TGeoPgon(0.,20.,1,2);
 748   el->DefineSection(0,-1.872,81.5-shift,250.75-shift);
 749   el->DefineSection(1,1.872,81.5-shift,250.75-shift);
 750   TGeoVolume *elv = new TGeoVolume("TPC_ELEC",el,m9); //Si
 751   //
 752   shv->AddNode(elv,1);
 753   //
 754   //
 755   ys = shift*TMath::Sin(openingAngle);
 756   xs = shift*TMath::Cos(openingAngle);
 757   swv->AddNode(shv,1,new TGeoTranslation(xs,ys,0.));
 758   // cover
 759   TGeoPgon *co = new TGeoPgon(0.,20.,1,2);
 760   co->DefineSection(0,-0.5,77.,255.25);
 761   co->DefineSection(1,0.5,77.,255.25);
 762   TGeoVolume *cov = new TGeoVolume("TPC_SWC1",co,m3);//Al
 763   // hole in a cover
 764   TGeoPgon *coh = new TGeoPgon(0.,20.,1,2);
 765   shift=4./TMath::Sin(openingAngle);
 766   coh->DefineSection(0,-0.5,85.-shift,247.25-shift);
 767   coh->DefineSection(1,0.5,85.-shift,247.25-shift);
 768   //
 769   TGeoVolume *cohv = new TGeoVolume("TPC_SWC2",coh,m1);
 770   //
 771   ys = shift*TMath::Sin(openingAngle);
 772   xs = shift*TMath::Cos(openingAngle);
 773   cov->AddNode(cohv,1,new TGeoTranslation(xs,ys,0.));
 774   //
 775   // Sector as an Assembly
 776   //
 777   TGeoVolumeAssembly *swhs = new TGeoVolumeAssembly("TPC_SSWSEC");
 778   swhs->AddNode(swv,1);
 779   swhs->AddNode(cov,1,new TGeoTranslation(0.,0.,-4.5));
 780   swhs->AddNode(cov,2,new TGeoTranslation(0.,0.,4.5));
 781   //
 782   // SSW as an Assembly of sectors
 783   //
 784  TGeoVolumeAssembly *swheel = new TGeoVolumeAssembly("TPC_SSWHEEL");
 785    for(Int_t i =0;i<18;i++){
 786      Double_t phi = (20.*i);
 787      TGeoRotation *r = new TGeoRotation();
 788      r->RotateZ(phi);
 789      swheel->AddNode(swhs,i+1,r);
 790    }
 791    v1->AddNode(swheel,1,new TGeoTranslation(0.,0.,-284.6));
 792    v1->AddNode(swheel,2,new TGeoTranslation(0.,0.,284.6));
 793
 794    // sensitive strips - strip "0" is always set
 795    // conditional
 796    Int_t totrows;
 797    totrows = fTPCParam->GetNRowLow() + fTPCParam->GetNRowUp();
 798    Double_t *upar;
 799    upar=NULL;
 800    gGeoManager->Volume("TPC_Strip","PGON",m5->GetId(),upar);
 801    upar=new Double_t [10];
 802    upar[0]=0.;
 803    upar[1]=360.;
 804    upar[2]=18.;
 805    upar[3]=2.;
 806    //
 807    upar[4]=-124.8;
 808    upar[7]=124.8;
 809
 810    Double_t rlow=fTPCParam->GetPadRowRadiiLow(0);
 811
 812    upar[5]=rlow;
 813    upar[6]=rlow+.01;
 814    upar[8]=upar[5];
 815    upar[9]=upar[6];
 816    //
 817    gGeoManager->Node("TPC_Strip",1,"TPC_Drift",0.,0.,124.82,0,kTRUE,upar,10);
 818    gGeoManager->Node("TPC_Strip",totrows+1,
 819                      "TPC_Drift",0.,0.,-124.82,0,kTRUE,upar,10);
 820    //
 821    // now, strips optionally
 822    //
 823    if(fSens){
 824      //lower sectors
 825      for(Int_t i=2;i<fTPCParam->GetNRowLow()+1;i++){
 826        rlow=fTPCParam->GetPadRowRadiiLow(i-1);
 827        upar[5]=rlow;
 828        upar[6]=rlow+.01;
 829        upar[8]=upar[5];
 830        upar[9]=upar[6];
 831        gGeoManager->Node("TPC_Strip",i,
 832                          "TPC_Drift",0.,0.,124.82,0,kTRUE,upar,10);
 833        gGeoManager->Node("TPC_Strip",totrows+i,
 834                          "TPC_Drift",0.,0.,-124.82,0,kTRUE,upar,10);
 835      }
 836      //upper sectors
 837      for(Int_t i=1;i<fTPCParam->GetNRowUp()+1;i++){
 838        rlow=fTPCParam->GetPadRowRadiiUp(i-1);
 839        upar[5]=rlow;
 840        upar[6]=rlow+.01;
 841        upar[8]=upar[5];
 842        upar[9]=upar[6];
 843        gGeoManager->Node("TPC_Strip",i+fTPCParam->GetNRowLow(),
 844                          "TPC_Drift",0.,0.,124.82,0,kTRUE,upar,10);
 845        gGeoManager->Node("TPC_Strip",totrows+i+fTPCParam->GetNRowLow(),
 846                          "TPC_Drift",0.,0.,-124.82,0,kTRUE,upar,10);
 847      }
 848    }//strips
 849   //----------------------------------------------------------
 850   // TPc Support Rods - MAKROLON
 851   //----------------------------------------------------------
 852   TGeoMedium *m6=gGeoManager->GetMedium("TPC_Makrolon");
 853   TGeoMedium *m7=gGeoManager->GetMedium("TPC_Cu");
 854   TGeoMedium *m10 =  gGeoManager->GetMedium("TPC_Alumina");
 855   TGeoMedium *m11 =  gGeoManager->GetMedium("TPC_Peek");
 856   TGeoMedium *m12 =  gGeoManager->GetMedium("TPC_Water");
 857   // upper and lower rods differ in length!
 858   delete [] upar;
 859   upar=NULL;
 860   gGeoManager->Volume("TPC_Rod","TUBE",m6->GetId(),upar);
 861   upar=new Double_t [3];
 862   upar[0]=1.8;
 863   upar[1]=2.2;
 864
 865   //
 866   //HV rods - makrolon + 0.58cm (diameter) Cu
 867   TGeoTube *hvr = new TGeoTube(0.,2.2,126.64);
 868   TGeoTube *hvc = new TGeoTube(0.,0.29,126.64);
 869   //
 870   TGeoVolume *hvrv = new TGeoVolume("TPC_HV_Rod",hvr,m6);
 871   TGeoVolume *hvcv = new TGeoVolume("TPC_HV_Cable",hvc,m7);
 872   hvrv->AddNode(hvcv,1);
 873   //
 874   // resistor rods
 875   //
 876   TGeoTube *cri = new TGeoTube(0.,0.45,126.64); //inner
 877   TGeoTube *cro = new TGeoTube(0.,0.45,126.54); //outer
 878   TGeoTube *cwi = new TGeoTube(0.,0.15,126.64); // water inner
 879   TGeoTube *cwo = new TGeoTube(0.,0.15,126.54); // water outer
 880   //
 881   TGeoVolume *criv = new TGeoVolume("TPC_CR_I",cri,m10);
 882   TGeoVolume *crov = new TGeoVolume("TPC_CR_O",cro,m10);
 883   TGeoVolume *cwiv = new TGeoVolume("TPC_W_I",cwi,m11);
 884   TGeoVolume *cwov = new TGeoVolume("TPC_W_O",cwo,m11);
 885   //
 886   // ceramic rod with water
 887   //
 888   criv->AddNode(cwiv,1);
 889   crov->AddNode(cwov,1);
 890   //
 891   TGeoTube *pri =new TGeoTube(0.2,0.35,126.64); //inner
 892   TGeoTube *pro = new TGeoTube(0.2,0.35,126.54); //outer
 893   //
 894   // peek rod
 895   //
 896   TGeoVolume *priv = new TGeoVolume("TPC_PR_I",pri,m12);
 897   TGeoVolume *prov = new TGeoVolume("TPC_PR_O",pro,m12);
 898   //
 899   // resistor rods assembly
 900   //
 901    TGeoRotation *rotr = new TGeoRotation("rotr");
 902    rotr->RotateZ(-21.);
 903   //
 904   TGeoTube *rri = new TGeoTube(1.8,2.2,126.64);//inner
 905   TGeoTube *rro = new TGeoTube(1.8,2.2,126.54);//inner
 906   //
 907   TGeoVolume *rriv = new TGeoVolume("TPC_RR_I",rri,m6);
 908   TGeoVolume *rrov = new TGeoVolume("TPC_RR_O",rro,m6);
 909   //
 910   TGeoVolumeAssembly *rrin = new TGeoVolumeAssembly("TPC_RROD_I");
 911   TGeoVolumeAssembly *rrou = new TGeoVolumeAssembly("TPC_RROD_O");
 912   rrin->AddNode(rriv,1);
 913   rrin->AddNode(criv,1,new TGeoTranslation(0.5,0.866, 0.));
 914   rrin->AddNode(criv,2,new TGeoTranslation(0.5,-0.866, 0.));
 915   rrin->AddNode(priv,1);
 916   //
 917   rrou->AddNode(rrov,1);
 918   rrou->AddNode(crov,1,new TGeoTranslation(0.5,0.866, 0.));
 919   rrou->AddNode(crov,2,new TGeoTranslation(0.5,-0.866, 0.));
 920   rrou->AddNode(prov,1);
 921   for(Int_t i=0;i<18;i++){
 922     Double_t angle,x,y;
 923     Double_t z,r;
 924     angle=TMath::DegToRad()*20.*(Double_t)i;
 925     r=81.5;
 926     x=r * TMath::Cos(angle);
 927     y=r * TMath::Sin(angle);
 928     upar[2]=126.64; //lower
 929     z= 126.96;
 930     //
 931     if(i==3){
 932       v9->AddNode(rrin,1,new TGeoCombiTrans(x,y,z,rotr)); //A
 933       v9->AddNode(rrin,2,new TGeoCombiTrans(x,y,-z,rotr)); //C
 934     }
 935     else {
 936       gGeoManager->Node("TPC_Rod",i+1,"TPC_Drift",x,y,z,0,kTRUE,upar,3);//shaft
 937       gGeoManager->Node("TPC_Rod",i+19,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);//muon
 938     }
 939
 940
 941     //
 942     r=254.25;
 943     x=r * TMath::Cos(angle);
 944     y=r * TMath::Sin(angle);
 945     upar[2]=126.54; //upper
 946     z=127.06;
 947     if(i==15){
 948       //v9->AddNode(hvrv,1,new TGeoTranslation(x,y,z));//A-side only
 949       v9->AddNode(hvrv,1,new TGeoTranslation(x,y,127.14));//A-side only
 950       gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
 951     }
 952     else if(i==11){
 953       v9->AddNode(rrou,1,new TGeoCombiTrans(x,y,z,rotr)); //A
 954       v9->AddNode(rrou,2,new TGeoCombiTrans(x,y,-z,rotr)); //C
 955     }
 956     else{
 957     //
 958       gGeoManager->Node("TPC_Rod",i+37,"TPC_Drift",x,y,z,0,kTRUE,upar,3);
 959       gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
 960     }
 961   }
 962
 963   TGeoVolume *alice = gGeoManager->GetVolume("ALIC");
 964   alice->AddNode(v1,1);
 965
 966 } // end of function
 967
 968 //_____________________________________________________________________________
 969 void AliTPCv4::AddAlignableVolumes() const
 970 {
 971   //
 972   // Create entries for alignable volumes associating the symbolic volume
 973   // name with the corresponding volume path. Needs to be syncronized with
 974   // eventual changes in the geometry.
 975   //
 976   SetInnerChambersAlignable();
 977   SetOuterChambersAlignable();
 978 }
 979
 980 //_____________________________________________________________________________
 981 void AliTPCv4::SetInnerChambersAlignable() const
 982 {
 983   //
 984   Int_t modnum = 0;
 985   TString vpstr1 = "ALIC_1/TPC_M_1/TPC_Drift_1/TPC_ENDCAP_1/TPC_SECT_";
 986   TString vpstr2 = "ALIC_1/TPC_M_1/TPC_Drift_1/TPC_ENDCAP_2/TPC_SECT_";
 987   TString vpappend = "/TPC_IROC_1";
 988   TString snstr1="TPC/EndcapA/Sector";
 989   TString snstr2="TPC/EndcapC/Sector";
 990   TString snappend="/InnerChamber";
 991   TString volpath, symname;
 992
 993   for(Int_t cnt=1; cnt<=18; cnt++){
 994     volpath = vpstr1;
 995     volpath += cnt;
 996     volpath += vpappend;
 997     symname = snstr1;
 998     symname += cnt;
 999     symname += snappend;
1000     if(!gGeoManager->SetAlignableEntry(symname.Data(),volpath.Data()))
1001       AliFatal(Form("Alignable entry %s not created. Volume path %s not valid", symname.Data(),volpath.Data()));
1002     //
1003     TGeoPNEntry *alignableEntry = gGeoManager->GetAlignableEntry(symname.Data());
1004     const char *path = alignableEntry->GetTitle();
1005     if (!gGeoManager->cd(path))
1006       AliFatal(Form("Volume path %s not valid!",path));
1007     TGeoHMatrix* globMatrix = gGeoManager->GetCurrentMatrix();
1008     TGeoHMatrix* matTtoL = fTPCParam->Tracking2LocalMatrix(globMatrix,cnt-1);
1009     alignableEntry->SetMatrix(matTtoL);
1010     modnum++;
1011   }
1012
1013   for(Int_t cnt=1; cnt<=18; cnt++){
1014     volpath = vpstr2;
1015     volpath += cnt;
1016     volpath += vpappend;
1017     symname = snstr2;
1018     symname += cnt;
1019     symname += snappend;
1020     if(!gGeoManager->SetAlignableEntry(symname.Data(),volpath.Data()))
1021       AliFatal(Form("Alignable entry %s not created. Volume path %s not valid", symname.Data(),volpath.Data()));
1022     TGeoPNEntry *alignableEntry = gGeoManager->GetAlignableEntry(symname.Data());
1023     const char *path = alignableEntry->GetTitle();
1024     if (!gGeoManager->cd(path))
1025       AliFatal(Form("Volume path %s not valid!",path));
1026     TGeoHMatrix* globMatrix = gGeoManager->GetCurrentMatrix();
1027     TGeoHMatrix* matTtoL = fTPCParam->Tracking2LocalMatrix(globMatrix,18+cnt-1);
1028     alignableEntry->SetMatrix(matTtoL);
1029     modnum++;
1030   }
1031 }
1032
1033 //_____________________________________________________________________________
1034 void AliTPCv4::SetOuterChambersAlignable() const
1035 {
1036   //
1037   Int_t modnum = 0;
1038   TString vpstr1 = "ALIC_1/TPC_M_1/TPC_Drift_1/TPC_ENDCAP_1/TPC_SECT_";
1039   TString vpstr2 = "ALIC_1/TPC_M_1/TPC_Drift_1/TPC_ENDCAP_2/TPC_SECT_";
1040   TString vpappend = "/TPC_OROC_1";
1041   TString snstr1="TPC/EndcapA/Sector";
1042   TString snstr2="TPC/EndcapC/Sector";
1043   TString snappend="/OuterChamber";
1044   TString volpath, symname;
1045
1046   for(Int_t cnt=1; cnt<=18; cnt++){
1047     volpath = vpstr1;
1048     volpath += cnt;
1049     volpath += vpappend;
1050     symname = snstr1;
1051     symname += cnt;
1052     symname += snappend;
1053     if(!gGeoManager->SetAlignableEntry(symname.Data(),volpath.Data()))
1054       AliFatal(Form("Alignable entry %s not created. Volume path %s not valid", symname.Data(),volpath.Data()));
1055     TGeoPNEntry *alignableEntry = gGeoManager->GetAlignableEntry(symname.Data());
1056     const char *path = alignableEntry->GetTitle();
1057     if (!gGeoManager->cd(path))
1058       AliFatal(Form("Volume path %s not valid!",path));
1059     TGeoHMatrix* globMatrix = gGeoManager->GetCurrentMatrix();
1060     TGeoHMatrix* matTtoL = fTPCParam->Tracking2LocalMatrix(globMatrix,36+cnt-1);
1061     alignableEntry->SetMatrix(matTtoL);
1062     modnum++;
1063   }
1064
1065   for(Int_t cnt=1; cnt<=18; cnt++){
1066     volpath = vpstr2;
1067     volpath += cnt;
1068     volpath += vpappend;
1069     symname = snstr2;
1070     symname += cnt;
1071     symname += snappend;
1072     if(!gGeoManager->SetAlignableEntry(symname.Data(),volpath.Data()))
1073       AliFatal(Form("Alignable entry %s not created. Volume path %s not valid", symname.Data(),volpath.Data()));
1074      TGeoPNEntry *alignableEntry = gGeoManager->GetAlignableEntry(symname.Data());
1075     const char *path = alignableEntry->GetTitle();
1076     if (!gGeoManager->cd(path))
1077       AliFatal(Form("Volume path %s not valid!",path));
1078     TGeoHMatrix* globMatrix = gGeoManager->GetCurrentMatrix();
1079     TGeoHMatrix* matTtoL = fTPCParam->Tracking2LocalMatrix(globMatrix,36+18+cnt-1);
1080     alignableEntry->SetMatrix(matTtoL);
1081     modnum++;
1082   }
1083 }
1084
1085 //_____________________________________________________________________________
1086 void AliTPCv4::DrawDetector()
1087 {
1088   //
1089   // Draw a shaded view of the Time Projection Chamber version 1
1090   //
1091
1092   // Set everything unseen
1093   gMC->Gsatt("*", "seen", -1);
1094   //
1095   // Set ALIC mother transparent
1096   gMC->Gsatt("ALIC","SEEN",0);
1097   //
1098   // Set the volumes visible
1099   //
1100
1101   gMC->Gsatt("TPC ","SEEN",0);
1102   gMC->Gsatt("TOIN","SEEN",1);
1103   gMC->Gsatt("TOIN","COLO",7);
1104   gMC->Gsatt("TOCV","SEEN",1);
1105   gMC->Gsatt("TOCV","COLO",4);
1106   gMC->Gsatt("TSA1","SEEN",0);
1107   gMC->Gsatt("TSA2","SEEN",0);
1108   gMC->Gsatt("TSA3","SEEN",0);
1109   gMC->Gsatt("TSA4","SEEN",0);
1110   gMC->Gsatt("TSA5","SEEN",0);
1111   gMC->Gsatt("TOFC","SEEN",1);
1112   gMC->Gsatt("TOFC","COLO",4);
1113   gMC->Gsatt("TSA6","SEEN",0);
1114   gMC->Gsatt("TSA7","SEEN",0);
1115   gMC->Gsatt("TSA8","SEEN",0);
1116   gMC->Gsatt("TIIN","SEEN",1);
1117   gMC->Gsatt("TIIN","COLO",7);
1118   gMC->Gsatt("TII1","SEEN",0);
1119   gMC->Gsatt("TIFC","SEEN",1);
1120   gMC->Gsatt("TIFC","COLO",4);
1121   gMC->Gsatt("TSA9","SEEN",0);
1122   gMC->Gsatt("TS10","SEEN",0);
1123   gMC->Gsatt("TS11","SEEN",0);
1124   gMC->Gsatt("TS12","SEEN",0);
1125   gMC->Gsatt("TS13","SEEN",0);
1126   gMC->Gsatt("TS14","SEEN",0);
1127   gMC->Gsatt("TICC","SEEN",0);
1128   gMC->Gsatt("TICM","SEEN",0);
1129   gMC->Gsatt("TS15","SEEN",0);
1130   gMC->Gsatt("TS16","SEEN",0);
1131   gMC->Gsatt("TS17","SEEN",0);
1132   gMC->Gsatt("TS18","SEEN",0);
1133   gMC->Gsatt("TS19","SEEN",0);
1134   gMC->Gsatt("TPJ1","SEEN",0);
1135   gMC->Gsatt("TPJ2","SEEN",0);
1136   gMC->Gsatt("TICS","SEEN",0);
1137   gMC->Gsatt("TDGN","SEEN",0);
1138   gMC->Gsatt("TIRC","SEEN",0);
1139   gMC->Gsatt("TIC1","SEEN",1);
1140   gMC->Gsatt("TIPP","SEEN",0);
1141   gMC->Gsatt("TIC3","SEEN",0);
1142   gMC->Gsatt("TRCE","SEEN",0);
1143   gMC->Gsatt("TPSC","SEEN",0);
1144   gMC->Gsatt("TPCC","SEEN",0);
1145   gMC->Gsatt("TORC","SEEN",0);
1146   gMC->Gsatt("TOPP","SEEN",0);
1147   gMC->Gsatt("TOC3","SEEN",0);
1148   gMC->Gsatt("TOC1","SEEN",1);
1149   gMC->Gsatt("TSSW","SEEN",1);
1150   gMC->Gsatt("TSWC","SEEN",1);
1151   gMC->Gsatt("TSSW","COLO",3);
1152   gMC->Gsatt("TSWC","COLO",3);
1153   gMC->Gsatt("TSCE","COLO",6);
1154   gMC->Gsatt("TSCE","SEEN",1);
1155   gMC->Gsatt("TWES","SEEN",0);
1156   gMC->Gsatt("TSWB","SEEN",0);
1157   gMC->Gsatt("TPEL","SEEN",0);
1158   gMC->Gsatt("TPMW","SEEN",1);
1159   gMC->Gsatt("TESR","SEEN",1);
1160   gMC->Gsatt("TPMW","COLO",12);
1161   gMC->Gsatt("TIC1","COLO",5);
1162   gMC->Gsatt("TOC1","COLO",5);
1163   gMC->Gsatt("TESB","SEEN",0);
1164   gMC->Gsatt("THVM","SEEN",1);
1165   gMC->Gsatt("THVM","COLO",11);
1166   gMC->Gsatt("THVH","SEEN",0);
1167   gMC->Gsatt("TPSR","SEEN",0);
1168   gMC->Gsatt("THVL","SEEN",0);
1169   gMC->Gsatt("THVC","SEEN",0);
1170   gMC->Gsatt("THVE","SEEN",0);
1171   gMC->Gsatt("THVR","SEEN",0);
1172   gMC->Gsatt("TPSS","SEEN",0);
1173   gMC->Gsatt("TPUS","SEEN",0);
1174   gMC->Gsatt("TPLS","SEEN",0);
1175
1176   //
1177   gMC->Gdopt("hide", "on");
1178   gMC->Gdopt("shad", "on");
1179   gMC->Gsatt("*", "fill", 7);
1180   gMC->SetClipBox(".");
1181   gMC->SetClipBox("TPMW",-300,300,-300,300,254.,270.);
1182   gMC->SetClipBox("TESR",-300,300,-300,300,254.,270.);
1183   gMC->SetClipBox("TSSW",-300,300,-300,300,283.,284.);
1184   gMC->SetClipBox("TSWC",-300,300,-300,300,283.,284.);
1185   gMC->SetClipBox("*", 0, 300, -300, 300, -290, 290);
1186   gMC->DefaultRange();
1187   gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025);
1188   gMC->Gdhead(1111, "Time Projection Chamber");
1189   gMC->Gdman(18, 4, "MAN");
1190   gMC->Gdopt("hide","off");
1191 }
1192
1193 //_____________________________________________________________________________
1194 void AliTPCv4::CreateMaterials()
1195 {
1196   //
1197   // Define materials for version 2 of the Time Projection Chamber
1198   //
1199
1200   AliTPC::CreateMaterials();
1201 }
1202
1203 //_____________________________________________________________________________
1204 void AliTPCv4::Init()
1205 {
1206   //
1207   // Initialises version 2 of the TPC after that it has been built
1208   //
1209
1210   Int_t *idtmed = fIdtmed->GetArray();
1211
1212   AliTPC::Init();
1213
1214
1215   fIdSens=gMC->VolId("TPC_Strip");  // one strip is always selected...
1216
1217   fIDrift=gMC->VolId("TPC_Drift");
1218   fSecOld=-100; // fake number
1219
1220   gMC->SetMaxNStep(-30000); // max. number of steps increased
1221
1222   gMC->Gstpar(idtmed[20],"LOSS",6); // specific energy loss
1223
1224   AliInfo("*** TPC version 4 initialized ***");
1225   AliInfo(Form("Maximum number of steps = %d",gMC->GetMaxNStep()));
1226
1227   //
1228
1229 }
1230
1231 //_____________________________________________________________________________
1232 void AliTPCv4::StepManager()
1233 {
1234   //
1235   // Called for every step in the Time Projection Chamber
1236   //
1237
1238   //
1239   // parameters used for the energy loss calculations
1240   //
1241   const Float_t kprim = 14.35; // number of primary collisions per 1 cm
1242   const Float_t kpoti = 20.77e-9; // first ionization potential for Ne/CO2
1243   const Float_t kwIon = 35.97e-9; // energy for the ion-electron pair creation
1244
1245
1246   const Float_t kbig = 1.e10;
1247
1248   Int_t id,copy;
1249   Float_t hits[5];
1250   Int_t vol[2];
1251   TLorentzVector p;
1252
1253   vol[1]=0; // preset row number to 0
1254   //
1255   gMC->SetMaxStep(kbig);
1256
1257
1258
1259   Float_t charge = gMC->TrackCharge();
1260
1261   if(TMath::Abs(charge)<=0.) return; // take only charged particles
1262
1263   // check the sensitive volume
1264
1265   id = gMC->CurrentVolID(copy); // vol ID and copy number (starts from 1!)
1266   if(id != fIDrift && id != fIdSens) return; // not in the sensitive folume
1267
1268   gMC->TrackPosition(p);
1269   Double_t r = TMath::Sqrt(p[0]*p[0]+p[1]*p[1]);
1270   //
1271
1272   //
1273   Double_t angle = TMath::ACos(p[0]/r);
1274   angle = (p[1]<0.) ? TMath::TwoPi()-angle : angle;
1275   //
1276   // angular segment, it is not a real sector number...
1277   //
1278   Int_t sector=TMath::Nint((angle-fTPCParam->GetInnerAngleShift())/
1279                fTPCParam->GetInnerAngle());
1280   // rotate to segment "0"
1281   Float_t cos,sin;
1282   fTPCParam->AdjustCosSin(sector,cos,sin);
1283   Float_t x1=p[0]*cos + p[1]*sin;
1284   // check if within sector's limits
1285   if(x1>=fTPCParam->GetInnerRadiusLow()&&x1<=fTPCParam->GetInnerRadiusUp()
1286      ||x1>=fTPCParam->GetOuterRadiusLow()&&x1<=fTPCParam->GetOuterRadiusUp()){
1287   // calculate real sector number...
1288   if (x1>fTPCParam->GetOuterRadiusLow()){
1289     sector = TMath::Nint((angle-fTPCParam->GetOuterAngleShift())/
1290              fTPCParam->GetOuterAngle())+fTPCParam->GetNInnerSector();
1291     if (p[2]<0)         sector+=(fTPCParam->GetNOuterSector()>>1);
1292   }
1293     else
1294       if (p[2]<0) sector+=(fTPCParam->GetNInnerSector()>>1);
1295   //
1296   // here I have a sector number
1297   //
1298
1299   vol[0]=sector;
1300   // check if change of sector
1301   if(sector != fSecOld){
1302     fSecOld=sector;
1303     // add track reference
1304     AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber());
1305   }
1306   // track is in the sensitive strip
1307   if(id == fIdSens){
1308     // track is entering the strip
1309     if (gMC->IsTrackEntering()){
1310       Int_t totrows = fTPCParam->GetNRowLow()+fTPCParam->GetNRowUp();
1311       vol[1] = (copy<=totrows) ? copy-1 : copy-1-totrows;
1312       // row numbers are autonomous for lower and upper sectors
1313       if(vol[0] > fTPCParam->GetNInnerSector()) {
1314         vol[1] -= fTPCParam->GetNRowLow();
1315       }
1316     //
1317       if(vol[0]<fTPCParam->GetNInnerSector()&&vol[1] == 0){
1318
1319         // lower sector, row 0, because Jouri wants to have this
1320
1321         gMC->TrackMomentum(p);
1322         hits[0]=p[0];
1323         hits[1]=p[1];
1324         hits[2]=p[2];
1325         hits[3]=0.; // this hit has no energy loss
1326         // Get also the track time for pileup simulation
1327         hits[4]=gMC->TrackTime();
1328
1329         AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits);
1330       }
1331     //
1332
1333        gMC->TrackPosition(p);
1334        hits[0]=p[0];
1335        hits[1]=p[1];
1336        hits[2]=p[2];
1337        hits[3]=0.; // this hit has no energy loss
1338        // Get also the track time for pileup simulation
1339        hits[4]=gMC->TrackTime();
1340
1341        AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits);
1342
1343     }
1344     else return;
1345   }
1346   //-----------------------------------------------------------------
1347   //  charged particle is in the sensitive drift volume
1348   //-----------------------------------------------------------------
1349
1350   if(gMC->TrackStep() > 0){
1351
1352     Int_t nel = (Int_t)(((gMC->Edep())-kpoti)/kwIon) + 1;
1353     nel=TMath::Min(nel,30); // 30 electrons corresponds to 1 keV
1354     //
1355     gMC->TrackPosition(p);
1356     hits[0]=p[0];
1357     hits[1]=p[1];
1358     hits[2]=p[2];
1359     hits[3]=(Float_t)nel;
1360
1361     // Add this hit
1362
1363     if (fHitType&&2){
1364       gMC->TrackMomentum(p);
1365       Float_t momentum = TMath::Sqrt(p[0]*p[0]+p[1]*p[1]);
1366       Float_t precision =   (momentum>0.1) ? 0.002 :0.01;
1367       fTrackHits->SetHitPrecision(precision);
1368     }
1369
1370     // Get also the track time for pileup simulation
1371     hits[4]=gMC->TrackTime();
1372
1373     AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits);
1374
1375   } // step>0
1376   } //within sector's limits
1377   // Stemax calculation for the next step
1378   if(!gMC->IsTrackAlive()) return; // particle has disappeared
1379   Float_t pp;
1380   TLorentzVector mom;
1381   gMC->TrackMomentum(mom);
1382   Float_t ptot=mom.Rho();
1383   Float_t betaGamma = ptot/gMC->TrackMass();
1384
1385   Int_t pid=gMC->TrackPid();
1386   if((pid==kElectron || pid==kPositron) && ptot > 0.002)
1387     {
1388       pp = kprim*1.58; // electrons above 20 MeV/c are on the plateau!
1389     }
1390   else
1391     {
1392
1393       betaGamma = TMath::Max(betaGamma,(Float_t)7.e-3); // protection against too small bg
1394       pp=kprim*BetheBloch(betaGamma);
1395
1396       if(TMath::Abs(charge) > 1.) pp *= (charge*charge);
1397     }
1398
1399   Double_t rnd = gMC->GetRandom()->Rndm();
1400
1401   gMC->SetMaxStep(-TMath::Log(rnd)/pp);
1402
1403
1404 }
1405
1406 //_____________________________________________________________________________
1407 Float_t AliTPCv4::BetheBloch(Float_t bg)
1408 {
1409   //
1410   // Bethe-Bloch energy loss formula
1411   //
1412   const Double_t kp1=0.76176e-1;
1413   const Double_t kp2=10.632;
1414   const Double_t kp3=0.13279e-4;
1415   const Double_t kp4=1.8631;
1416   const Double_t kp5=1.9479;
1417
1418   Double_t dbg = (Double_t) bg;
1419
1420   Double_t beta = dbg/TMath::Sqrt(1.+dbg*dbg);
1421
1422   Double_t aa = TMath::Power(beta,kp4);
1423   Double_t bb = TMath::Power(1./dbg,kp5);
1424
1425   bb=TMath::Log(kp3+bb);
1426
1427   return ((Float_t)((kp2-aa-bb)*kp1/aa));
1428 }
1429
1430