///////////////////////////////////////////////////////////////////////////////
//                                                                           //
//  Time Projection Chamber version 1 -- detailed TPC and fast simulation    //
//                                                                           //
//Begin_Html
/*
<img src="gif/AliTPCv1Class.gif">
*/
//End_Html
//                                                                           //
//                                                                           //
///////////////////////////////////////////////////////////////////////////////

#include <TMath.h>
#include <TGeometry.h>
#include <TNode.h>
#include <TBRIK.h>
#include <TTUBE.h>
#include "AliTPCv1.h"
#include "AliRun.h"
#include <iostream.h>
#include <fstream.h>

#include "AliMC.h"
#include "AliConst.h"

#include "AliTPCParam.h"
#include "AliTPCD.h"

ClassImp(AliTPCv1)
 
//_____________________________________________________________________________
AliTPCv1::AliTPCv1(const char *name, const char *title) 
  :AliTPC(name, title) {
  //
  // Standard constructor for Time Projection Chamber
  //
  fIdSens1=fIdSens2=0;
}

//_____________________________________________________________________________
void AliTPCv1::CreateGeometry()
{
  //
  // Creates geometry for Time Projection Chamber version 1
  // Detailed geometry -- Fast simulation
  // Origin M.Kowalski 
  //
  //Begin_Html
  /*
    <img src="gif/AliTPCv1.gif">
  */
  //End_Html
  //Begin_Html
  /*
    <img src="gif/AliTPCv1Tree.gif">
  */
  //End_Html

  AliMC* pMC = AliMC::GetMC();

  Int_t *idtmed = gAlice->Idtmed();


  AliTPCParam * fTPCParam = &(fDigParam->GetParam());
  
  Float_t tana, rlsl, wlsl, rssl, rlsu, wssl, wlsu,
    rssu, wssu, alpha, x, y, z, sec_thick;
  
  Float_t r1, r2, x1, z0, z1, x2, theta1, theta2, theta3, dm[21];
  Int_t il, iu;
  Float_t z_side, zz;
  Int_t idrotm[100];
  
  Float_t x0l, x0u;
  Int_t idr;
  Float_t thl;
  Int_t ils;
  Float_t opl;
  Int_t iss;
  Float_t thu, opu, phi1, phi2, phi3;
  
  // ---------------------------------------------------- 
  //          FIELD CAGE WITH ENDCAPS - CARBON FIBER 
  //          THIS IS ALSO A TPC MOTHER VOLUME 
  // ---------------------------------------------------- 
  dm[0] = 76.;
  dm[1] = 278.;
  dm[2] = 275.;
  
  pMC->Gsvolu("TPC ", "TUBE", idtmed[407], dm, 3);
  
  // ------------------------------------------------------- 
  //     drift gas Ne/CO2 (90/10 volume) - nonsensitive 
  //     field cage thickness = 0.52% X0 
  // ---------------------------------------------------- 
  
  //Begin_Html
  /*
    <img src="gif/spec_tgas1.gif">
  */
  //End_Html
  
  dm[0] = 76.+0.09776;
  dm[1] = 257.;
  dm[2] = 250.;
  
  pMC->Gsvolu("TGAS", "TUBE", idtmed[402], dm, 3);
  
  // ------------------------------------------------------ 
  //     "side" gas volume (the same as drift gas), 
  //      here the readout chambers are positioned 
  // ------------------------------------------------------ 
  
  //Begin_Html
  /*
    <img src="gif/spec_tpsg1.gif">
  */
  //End_Html
  
  dm[2]  = 12.5;
  z_side = dm[2];
  
  pMC->Gsvolu("TPSG", "TUBE", idtmed[401], dm, 3);
  // ------------------------------------------------------ 
  //      HV midplane - 20 microns of mylar 
  // ----------------------------------------------------- 
  dm[2] = .001;
  
  pMC->Gsvolu("TPHV", "TUBE", idtmed[405], dm, 3);
  
  // ==================================================== 
  //   lower and upper readout chambers 
  // ==================================================== 
  //   sectors opening angles in degrees 
  // --------------------------------------------------- 
  opl = 30.;
  opu = 15.;
  thl = TMath::Tan(opl * .5 * kDegrad);
  thu = TMath::Tan(opu * .5 * kDegrad);
  // --------------------------------------------------- 
  //         S and L-sectors radii 
  // --------------------------------------------------- 
  rssl = 88.;
  rssu = 136.;
  rlsl = 142.;
  rlsu = 250.;
  // -------------------------------------------------- 
  //          Sectors widths 
  // -------------------------------------------------- 
  wssl = 46.5;
  wssu = 72.2;
  wlsl = 37.;
  wlsu = 65.4;
  // --------------------------------------------------- 
  //    Sector thickness 25% of X0 (Al) 
  // --------------------------------------------------- 
  sec_thick = 2.225;
  // --------------------------------------------------- 
  //     S-sectors (lower sectors) 
  // --------------------------------------------------- 
  dm[0] = wssl * .5;
  dm[1] = wssu * .5;
  dm[2] = sec_thick * .5;
  dm[3] = (rssu - rssl) * .5;
  
  x0l = rssl + dm[3];
  
  //Begin_Html
  /*
    <img src="gif/spec_trcs1.gif">
  */
  //End_Html
  
  
  pMC->Gsvolu("TRCS", "TRD1", idtmed[399], dm, 4);
  // ----------------------------------------------------- 
  //     S-sectors --> "gas sectors" 
  // ----------------------------------------------------- 
  
  //Begin_Html
  /*
    <img src="gif/spec_tsga1.gif">
  */
  //End_Html

  dm[2] = (250.-0.001)/2.;
  pMC->Gsvolu("TSGA", "TRD1", idtmed[402], dm, 4);
  // --------------------------------------------------- 
  //     L-sectors (upper sectors) 
  // --------------------------------------------------- 
  dm[0] = wlsl * .5;
  dm[1] = wlsu * .5;
  dm[2] = sec_thick * .5;
  dm[3] = (rlsu - rlsl) * .5;
  
  x0u = rlsl + dm[3];

  pMC->Gsvolu("TRCL", "TRD1", idtmed[399], dm, 4);
  // ----------------------------------------------------- 
  //     L-sectors - "gas sectors" 
  // ----------------------------------------------------- 
  dm[2] = (250.-0.001)/2.;
  pMC->Gsvolu("TLGA", "TRD1", idtmed[402], dm, 4);
  // ----------------------------------------------------- 
  //  thin sensitive strips (100 microns) placed at a center 
  //  of each pad row  in the "drift gas sector" 
  // ----------------------------------------------------- 
  pMC->Gsvolu("TSST", "TRD1", idtmed[403], dm, 0);
  
  dm[3] = .005;
  z0    = rssl + (rssu - rssl) * .5;

  for (iss = 0; iss < fTPCParam->GetNRowLow(); ++iss) {
    r1    = fTPCParam->GetPadRowRadiiLow(iss);
    r2    = r1 + dm[3] * 2.;
    dm[0] = r1 * thl - 2.63;
    dm[1] = r2 * thl - 2.63;

    zz    = -z0 + r1+dm[3];

    pMC->Gsposp("TSST", iss+1, "TSGA", 0, 0, zz, 0, "ONLY", dm, 4);
  }
  // ----------------------------------------------------- 
  //  thin sensitive strips (100 microns) placed at a center 
  //  of each pad row  in the "drift gas sector" 
  // ----------------------------------------------------- 
  pMC->Gsvolu("TLST", "TRD1", idtmed[403], dm, 0);

  z0   = rlsl+ (rlsu - rlsl) * .5;
  
  for (ils = 0; ils < fTPCParam->GetNRowUp(); ++ils) {
    r1    = fTPCParam->GetPadRowRadiiUp(ils);
    r2    = r1 + dm[3] * 2.;
    dm[0] = r1 * thu - 2.63;
    dm[1] = r2 * thu - 2.63;

    zz    = -z0 + r1 +dm[3];

    pMC->Gsposp("TLST", ils+1, "TLGA", 0, 0, zz, 0, "ONLY", dm, 4);
  }
  // ------------------------------------------------ 
  //      positioning of lower sectors (1-12)*2 
  //          rotation matrices 1-12 
  // ------------------------------------------------ 
  z  = (250.+0.001)/2.;
  z1 = -z_side + sec_thick * .5;
  
  for (il = 0; il < 12; ++il) {
    phi1 = il * opl + 270;
    if (phi1 > 360.) {
      phi1 += -360;
    }
    theta1 = 90.;
    phi2   = 90.;
    theta2 = 180.;
    phi3   = il * opl;
    theta3 = 90.;
    
    idr = il+1;
    AliMatrix(idrotm[idr], theta1, phi1, theta2, phi2, theta3, phi3);
    
    alpha = il * opl * kDegrad;
    x     = x0l * TMath::Cos(alpha);
    y     = x0l * TMath::Sin(alpha);

    pMC->Gspos("TSGA", il+1, "TGAS", x, y, z,  idrotm[idr], "ONLY");
    pMC->Gspos("TSGA", il+13,"TGAS", x, y, -z, idrotm[idr], "ONLY");
    pMC->Gspos("TRCS", il+1, "TPSG", x, y, z1, idrotm[idr], "ONLY");
    
  }
  // ---------------------------------------------------- 
  //      positioning of upper sectors (1-24)*2 
  //          rotation matrices 13-36 
  // ---------------------------------------------------- 
  for (iu = 1; iu <= 24; ++iu) {
    phi1 = (iu - 1) * opu + 270.;
    if (phi1 > 360.) {
      phi1 += -360.;
    }
    theta1 = 90.;
    phi2   = 90.;
    theta2 = 180.;
    phi3   = (iu - 1) * opu;
    theta3 = 90.;
    
    idr = iu + 12;
    AliMatrix(idrotm[idr], theta1, phi1, theta2, phi2, theta3, phi3);
    
    alpha = (iu - 1) * opu * kDegrad;
    x     = x0u * TMath::Cos(alpha);
    y     = x0u * TMath::Sin(alpha);
    
    pMC->Gspos("TLGA", iu, "TGAS", x, y, z, idrotm[idr], "ONLY");
    pMC->Gspos("TLGA", iu+24, "TGAS", x, y, -z, idrotm[idr], "ONLY");
    
    pMC->Gspos("TRCL", iu, "TPSG", x, y, z1, idrotm[idr], "ONLY");
  }
  // -------------------------------------------------------- 
  //             Spoke wheel structures 
  // -------------------------------------------------------- 
  pMC->Gsvolu("TSWS", "TUBE", idtmed[399], dm, 0);

  z0 = -z_side + 2.;
  
  dm[0] = 82.;
  dm[1] = 86.;
  dm[2] = 1.;
  
  pMC->Gsposp("TSWS", 1, "TPSG", 0, 0, z0, 0, "ONLY", dm, 3);
  
  dm[0] = 253.;
  dm[1] = 257.;
  
  pMC->Gsposp("TSWS", 2, "TPSG", 0, 0, z0, 0, "ONLY", dm, 3);
  
  dm[0] = 140.9;
  dm[1] = 141.9;
  
  pMC->Gsposp("TSWS", 3, "TPSG", 0, 0, z0, 0, "ONLY", dm, 3);
  
  // ------------------------------------------------------- 
  //    this volumes are to avoid overlaping 
  // ------------------------------------------------------- 
  z0 = 253.;
  
  dm[0] = 76.;
  dm[1] = 76.+0.09776;
  
  pMC->Gsposp("TSWS", 4, "TPC ", 0, 0, z0, 0, "ONLY", dm, 3);
  pMC->Gsposp("TSWS", 5, "TPC ", 0, 0, -z0, 0, "ONLY", dm, 3);
  
  z0 += 21.;
  
  pMC->Gsposp("TSWS", 6, "TPC ", 0, 0, z0, 0, "ONLY", dm, 3);
  pMC->Gsposp("TSWS", 7, "TPC ", 0, 0, -z0, 0, "ONLY", dm, 3);
  
  dm[0] = 257.;
  dm[1] = 257.+0.09776;
  dm[2] = 11.5;
  
  z0 = 263.5;
  
  pMC->Gsposp("TSWS", 8, "TPC ", 0, 0, z0, 0, "ONLY", dm, 3);
  pMC->Gsposp("TSWS", 9, "TPC ", 0, 0, -z0, 0, "ONLY", dm, 3);
  // ========================================================== 
  //                  wheels 
  // ========================================================== 
  // ---------------------------------------------------------- 
  //       Large wheel -> positioned in the TPC 
  // ---------------------------------------------------------- 
  dm[0] = 257.+0.09776;
  dm[1] = 278.;
  dm[2] = 11.5;
  pMC->Gsvolu("TPW1", "TUBE", idtmed[399], dm, 3);
  
  dm[0] = 259.;
  dm[1] = 278.;
  dm[2] = 9.5;
  
  pMC->Gsvolu("TPW2", "TUBE", idtmed[498], dm, 3);
    
  pMC->Gspos("TPW2", 1, "TPW1", 0, 0, 0, 0, "ONLY");
  
  pMC->Gspos("TPW1", 1, "TPC ", 0, 0, z0, 0, "ONLY");
  pMC->Gspos("TPW1", 2, "TPC ", 0, 0, -z0, 0, "ONLY");
  // ----------------------------------------------------------- 
  //     Small wheel -> positioned in the TPSG 
  // ----------------------------------------------------------- 
  dm[0] = 76.+0.09776;
  dm[1] = 82.;
  dm[2] = 11.5;
  
  pMC->Gsvolu("TPW3", "TUBE", idtmed[399], dm, 3);
  
  dm[0] = 76.+0.09776;
  dm[1] = 80.;
  dm[2] = 9.5;
  
  pMC->Gsvolu("TPW4", "TUBE", idtmed[401], dm, 3);
  
  pMC->Gspos("TPW4", 1, "TPW3", 0, 0, 0, 0, "ONLY");
  
  z0 = 1.;
  
  pMC->Gspos("TPW3", 1, "TPSG", 0, 0, z0, 0, "ONLY");
  // --------------------------------------------------------- 
  //       spokes, inner and outer, also the inner ring 
  // --------------------------------------------------------- 
  
  //Begin_Html
  /*
    <img src="gif/spec_tspo1.gif">
  */
  //End_Html
  
  dm[0] = 0.5*(135.9-82.1);
  dm[1] = 3.;
  dm[2] = 2.;
  
  x1 = dm[0] + 82.;
  
  pMC->Gsvolu("TSPI", "BOX ", idtmed[399], dm, 3);
  
  dm[1] = 2.;
  dm[2] = 1.;
  
  pMC->Gsvolu("TSP1", "BOX ", idtmed[498], dm, 3);
  
  pMC->Gspos("TSP1", 1, "TSPI", 0, 0, 0, 0, "ONLY");
  
  dm[0] = 0.5*(256.9-142.1);
  dm[1] = 3.;
  dm[2] = 2.;
  
  x2 = dm[0] + 142.;
  
  pMC->Gsvolu("TSPO", "BOX ", idtmed[399], dm, 3);
  
  dm[1] = 2.;
  dm[2] = 1.;
  
  pMC->Gsvolu("TSP2", "BOX ", idtmed[498], dm, 3);
  
  pMC->Gspos("TSP2", 1, "TSPO", 0, 0, 0, 0, "ONLY");
  // -------------------------------------------------------- 
  dm[0] = 136.;
  dm[1] = 142.;
  dm[2] = 2.;
  
  pMC->Gsvolu("TSWH", "TUBE", idtmed[399], dm, 3);
  
  dm[0] = 137.;
  dm[1] = 141.;
  dm[2] = 1.;
  
  pMC->Gsvolu("TSW1", "TUBE", idtmed[498], dm, 3);
  
  pMC->Gspos("TSW1", 1, "TSWH", 0, 0, 0, 0, "ONLY");
  
  z0 = z_side - .16168 - 2.;
  // -------------------------------------------------------- 
  pMC->Gspos("TSWH", 1, "TPSG", 0, 0, z0, 0, "ONLY");
  // ------------------------------------------------------- 
  //     posiioning of the inner spokes 
  // ------------------------------------------------------- 
  for (il = 1; il <= 6; ++il) {
    phi1 = opl * .5 + (il - 1) * 2. * opl;
    theta1 = 90.;
    phi2 = opl * .5 + 90. + (il - 1) * 2. * opl;
    if (phi2 > 360.) {
      phi2 += -360.;
    }
    theta2 = 90.;
    phi3   = 0.;
    theta3 = 0.;
    
    alpha = phi1 * kDegrad;
    x     = x1 * TMath::Cos(alpha);
    y     = x1 * TMath::Sin(alpha);
    
    idr = il + 36;
    
    AliMatrix(idrotm[idr], theta1, phi1, theta2, phi2, theta3, phi3);
    pMC->Gspos("TSPI", il, "TPSG", x, y, z0, idrotm[idr], "ONLY");
  }
  
  for (iu = 1; iu <= 12; ++iu) {
    phi1 = opu * .5 + (iu - 1) * 2. * opu;
    theta1 = 90.;
    phi2 = opu * .5 + 90. + (iu - 1) * 2. * opu;
    if (phi2 > 360.) {
      phi2 += -360.;
    }
    theta2 = 90.;
    phi3   = 0.;
    theta3 = 0.;
    
    alpha = phi1 * kDegrad;
    x     = x2 * TMath::Cos(alpha);
    y     = x2 * TMath::Sin(alpha);
    
    idr = iu + 42;
    
    AliMatrix(idrotm[idr], theta1, phi1, theta2, phi2, theta3, phi3);
    pMC->Gspos("TSPO", iu, "TPSG", x, y, z0, idrotm[idr], "ONLY");
  }
  // -------------------------------------------------------- 
  //       endcap cover (C, 0.86% X0) 
  // -------------------------------------------------------- 
  dm[0] = 76.+0.09776;
  dm[1] = 257.;
  dm[2] = 0.16168*0.5;
  
  pMC->Gsvolu("TCOV", "TUBE", idtmed[407], dm, 3);
  
  z0 = z_side - dm[2];
  
  pMC->Gspos("TCOV", 1, "TPSG", 0, 0, z0, 0, "ONLY");
  // -------------------------------------------------------- 
  //         put the readout chambers into the TPC 
  // -------------------------------------------------------- 
  theta1 = 90.;
  phi1   = 0.;
  theta2 = 90.;
  phi2   = 270.;
  theta3 = 180.;
  phi3   = 0.;
  
  AliMatrix(idrotm[55], theta1, phi1, theta2, phi2, theta3, phi3);
  
  z0 = z_side + 250.;
  
  pMC->Gspos("TPSG", 1, "TPC ", 0, 0, z0, 0, "ONLY");
  pMC->Gspos("TPSG", 2, "TPC ", 0, 0, -z0, idrotm[55], "ONLY");
  // --------------------------------------------------------- 
  //     outer gas insulation (CO2) 
  // --------------------------------------------------------- 
  dm[0] = 257.+0.09776;
  dm[1] = 278.-0.25004;
  dm[2] = 275.-23.;

  pMC->Gsvolu("TPOI", "TUBE", idtmed[406], dm, 3);
  
  pMC->Gspos("TPHV", 1, "TGAS", 0, 0, 0, 0, "ONLY");
  pMC->Gspos("TGAS", 1, "TPC ", 0, 0, 0, 0, "ONLY");
  pMC->Gspos("TPOI", 1, "TPC ", 0, 0, 0, 0, "ONLY");
  
  pMC->Gspos("TPC ", 1, "ALIC", 0, 0, 0, 0, "ONLY");
  // ====================================================== 
  //      all volumes below are positioned in ALIC 
  // ====================================================== 
  // ------------------------------------------------------ 
  //        the last parts of the smaller wheel (TSWS) 
  // ------------------------------------------------------ 
  dm[0] = 74.;
  dm[1] = 76.;
  dm[2] = 1.;

  z0 = 253.;
  
  pMC->Gsposp("TSWS", 10, "TPC ", 0, 0, z0, 0, "ONLY", dm, 3);
  pMC->Gsposp("TSWS", 11, "TPC ", 0, 0, -z0, 0, "ONLY", dm, 3);
  
  dm[0] = 70.;
  
  z0 += 21.;
  
  pMC->Gsposp("TSWS", 12, "TPC ", 0, 0, z0, 0, "ONLY", dm, 3);
  pMC->Gsposp("TSWS", 13, "TPC ", 0, 0, -z0, 0, "ONLY", dm, 3);
  // ---------------------------------------------------- 
  //             Inner vessel (PCON) 
  //   This volume is to be positioned directly in ALIC 
  // ---------------------------------------------------- 

  //Begin_Html
  /*
    <img src="gif/spec_tpiv1.gif">
  */
  //End_Html
  
  dm[0] = 0.;
  dm[1] = 360.;
  dm[2] = 4.;
  
  dm[3] = -250.;
  dm[4] = 75.;
  dm[5] = 76.;
  
  dm[6] = -64.5;
  dm[7] = 50.;
  dm[8] = 76.;
  
  dm[9] = 64.5;
  dm[10] = 50.;
  dm[11] = 76.;
  
  dm[12] = 250.;
  dm[13] = 75.;
  dm[14] = 76.;
  
  pMC->Gsvolu("TPIV", "PCON", idtmed[407], dm, 15);
  // -------------------------------------------------------- 
  //     fill the inner vessel with CO2, (HV kDegrader) 
  //     cone parts have different thickness 
  //     than the central barrel, according to the TP 
  // -------------------------------------------------------- 
  tana = 75./185.5;

  dm[0] = 0.;
  dm[1] = 360.;
  dm[2] = 6.;
  
  dm[3] = -(250.-0.2162);
  dm[4] = (185.5-0.2126)*tana+0.2126;
  dm[5] = 76-0.001;
  
  dm[6] = -64.5;
  dm[7] = 50.+0.2162;
  dm[8] = 76-0.001;
  
  dm[9]  = -64.5;
  dm[10] = 50+0.05076;
  dm[11] = 76-0.001;
  
  dm[12] = 64.5;
  dm[13] = 50+0.05076;
  dm[14] = 76-0.001;
  
  dm[15] = 64.5;
  dm[16] = 50.+0.2162;
  dm[17] = 76-0.001;
  
  dm[18] = (250.-0.2162);
  dm[19] = (185.5-0.2126)*tana+0.2126;
  dm[20] = 76-0.001;
  
  pMC->Gsvolu("TPVD", "PCON", idtmed[406], dm, 21);
  
  pMC->Gspos("TPVD", 1, "TPIV", 0, 0, 0, 0, "ONLY");
    
  pMC->Gspos("TPIV", 1, "ALIC", 0, 0, 0, 0, "ONLY");
  // --------------------------------------------------- 
  //               volumes ordering 
  // --------------------------------------------------- 
  pMC->Gsord("TGAS", 6);
  pMC->Gsord("TPSG", 6);
  pMC->Gsord("TSGA", 3);
  pMC->Gsord("TLGA", 3);
}

//_____________________________________________________________________________
void AliTPCv1::DrawDetector()
{
  //
  // Draw a shaded view of the Time Projection Chamber version 1
  //

  AliMC* pMC = AliMC::GetMC();

  // Set everything unseen
  pMC->Gsatt("*", "seen", -1);
  // 
  // Set ALIC mother transparent
  pMC->Gsatt("ALIC","SEEN",0);
  //
  // Set the volumes visible
  pMC->Gsatt("TPC","SEEN",0);
  pMC->Gsatt("TGAS","SEEN",0);
  pMC->Gsatt("TPSG","SEEN",0);
  pMC->Gsatt("TPHV","SEEN",1);
  pMC->Gsatt("TRCS","SEEN",1);
  pMC->Gsatt("TRCL","SEEN",1);
  pMC->Gsatt("TSST","SEEN",1);
  pMC->Gsatt("TLST","SEEN",1);
  pMC->Gsatt("TSWS","SEEN",1);
  pMC->Gsatt("TPW1","SEEN",1);
  pMC->Gsatt("TPW2","SEEN",1);
  pMC->Gsatt("TPW3","SEEN",1);
  pMC->Gsatt("TPW4","SEEN",1);
  pMC->Gsatt("TSPI","SEEN",1);
  pMC->Gsatt("TSP1","SEEN",0);
  pMC->Gsatt("TSPO","SEEN",1);
  pMC->Gsatt("TSP2","SEEN",0);
  pMC->Gsatt("TSWH","SEEN",1);
  pMC->Gsatt("TSW1","SEEN",1);
  pMC->Gsatt("TCOV","SEEN",0);
  pMC->Gsatt("TPOI","SEEN",1);
  pMC->Gsatt("TPIV","SEEN",1);
  pMC->Gsatt("TPVD","SEEN",1);
  //
  pMC->Gdopt("hide", "on");
  pMC->Gdopt("shad", "on");
  pMC->Gsatt("*", "fill", 7);
  pMC->SetClipBox(".");
  pMC->SetClipBox("*", 0, 1000, -1000, 1000, -1000, 1000);
  pMC->DefaultRange();
  pMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025);
  pMC->Gdhead(1111, "Time Projection Chamber");
  pMC->Gdman(18, 4, "MAN");
  pMC->Gdopt("hide","off");
}

//_____________________________________________________________________________
void AliTPCv1::CreateMaterials()
{
  //
  // Define materials for Time Projection Chamber
  //
  AliTPC::CreateMaterials();
}

//_____________________________________________________________________________
void AliTPCv1::Init()
{
  //
  // Initialises TPC detector after it has been created
  //
  AliMC* pMC=AliMC::GetMC();
  fIdSens1=pMC->VolId("TLST");
  fIdSens2=pMC->VolId("TSST");

  printf("TPC version 1 initialized\n");
}

//_____________________________________________________________________________
void AliTPCv1::StepManager()
{
  //
  // Called at every step in the Time Projection Chamber
  //
  Int_t         copy, id;
  Float_t       hits[4];
  Int_t         vol[2];
  TClonesArray &lhits = *fHits;
  AliMC* pMC=AliMC::GetMC();
  //
  if(pMC->TrackCharge() && pMC->TrackEntering()) {
    //
    // Only entering charged tracks
    if((id=pMC->CurrentVol(0, copy))==fIdSens1) {
      vol[1]=copy+23;
      id=pMC->CurrentVolOff(1,0,copy);
      vol[0]=copy+24;
    } else if(id==fIdSens2) {
      vol[1]=copy;
      id=pMC->CurrentVolOff(1,0,copy);
      vol[0]=copy;
    } else return;
    pMC->TrackPosition(hits);
    hits[3]=0;
    new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits);
  }
}