[u/mrichter/AliRoot.git] / START / AliSTARTv1.cxx

/**************************************************************************
 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/

/* $Id$ */

/////////////////////////////////////////////////////////////////////
//                                                                 //
// START ( T-zero) detector  version 1                             //
//
//Begin Html       
/*
<img src="gif/AliSTARTv1Class.gif">
*/
//End Html
//                                                                  //
//                                                                  //
//////////////////////////////////////////////////////////////////////

#include <Riostream.h>
#include <stdlib.h>

#include <TGeometry.h>
#include <TLorentzVector.h>
#include <TMath.h>
#include <TNode.h>
#include <TTUBE.h>
#include <TVirtualMC.h>

#include "AliLog.h"
#include "AliMagF.h"
#include "AliRun.h"

#include "AliSTARThit.h"
#include "AliSTARTv1.h"
#include "AliSTARTParameters.h"

#include "AliMC.h"
#include "AliCDBLocal.h"
#include "AliCDBStorage.h"
#include "AliCDBManager.h"
#include "AliCDBEntry.h"

ClassImp(AliSTARTv1)

//--------------------------------------------------------------------
AliSTARTv1::AliSTARTv1(const char *name, const char *title):
 AliSTART(name,title)
{
  //
  // Standart constructor for START Detector version 0
  //
  fIdSens1=0;
  fIshunt = 2;
}
//_____________________________________________________________________________

AliSTARTv1::~AliSTARTv1() 
{
  // desctructor  
}

//-------------------------------------------------------------------------
void AliSTARTv1::CreateGeometry()
{
  //
  // Create the geometry of START Detector version 0
  //
  // begin Html
  /*
   <img src="gif/AliSTARTv0.gif">
  */
  //


   Int_t *idtmed = fIdtmed->GetArray();
  
  AliSTARTParameters* param = AliSTARTParameters::Instance();
  param->Init();
  Float_t zdetC = param->GetZposition(0);
  Float_t zdetA = param->GetZposition(1);
  
  Int_t is;
  Int_t idrotm[999];
  Float_t x,y,z;

  Float_t pstartR[18]={0., 360., 5., 
		       -76.5+0.00+69.7, 4.25, 10.,
		       -76.5+6.05+69.7, 4.5, 10., 
		       -76.5+8.05+69.7, 4.5, 10.,
		       -76.5+8.05+69.7, 5.1, 10.,
		       -62.9+0.00+69.7, 5.1, 10.};
  
  Float_t pstart[3]={4.29, 12.5,6.95};
  Float_t pinstart[3]={0.,1.6,6.5};
  Float_t ppmt[3]={0.,1.5,3.5};
  Float_t ptop[3]={0.,1.,1.0};
  Float_t preg[3]={0., 1.0, 0.005}; //photcathode dobavil bogdanov
  Float_t ptopout[3]={1.,1.01,1.5}; 
  Float_t pbot[3]={0.6,1.2,0.1};
  Float_t pglass[3]={1.2,1.3,2.};
  Float_t pcer[3]={0.9,1.1,1.35};
  Float_t psteel[3]={0.9,1.1,0.15};
  Float_t psupport1[3] = {4.51,4.6,4.0};//C kozhuh vnutri
  Float_t psupport2[3] = {9.4,9.5,4.0};// snaruzhi  C
  Float_t psupport3[3] = {4.51,9.5,0.05};//kryshki  C
  Float_t psupport5[3] = {1.44,1.5,6.5}; // stakanchik dlai feu  C
  Float_t psupport6[3] = {0,1.4,0.04}; //kryshechka stakanchika  Al
  Float_t psupport7[3] = {1.5,1.6,0.4}; //kolechko snaruzhu stakanchika Al
   
  // Mother Volume katushka dlia krepezha vokrug truby k Absorbru
    AliMatrix(idrotm[901], 90., 0., 90., 90., 180., 0.);
  Float_t ppcon[70]; 
    ppcon[0]  =   0;
    ppcon[1]  = 360;
    ppcon[2]  =  13;
//  1: 
    ppcon[3]  =  14.1/2;
    ppcon[4]  =   4.4;
    ppcon[5]  =   4.5;
//  2
    ppcon[6]  = ppcon[3]+1.;
    ppcon[7]  =   4.4;
    ppcon[8]  =   4.5;
//  3
    ppcon[9]  = ppcon[6];
    ppcon[10] =   4.4;
    ppcon[11] =   5.1;

//  4

    ppcon[12]  = ppcon[9]+0.1;
    ppcon[13] =   4.4;
    ppcon[14] =   5.1;
//  5

    ppcon[15]  = ppcon[12];
    ppcon[16] =   4.9;
    ppcon[17] =   5.1;
    
//  6
//    ppcon[18]  = ppcon[15]+7.05;
    ppcon[18]  = ppcon[15]+6.9;
    ppcon[19] =   4.9;
    ppcon[20] =   5.1;
    
//  7
    ppcon[21]  = ppcon[18];
    ppcon[22] =   4.9;
    ppcon[23] =   5.1;

/// 8
    ppcon[24]  = ppcon[21]+0.01;
    ppcon[25] =   3.15;
    ppcon[26] =   3.25;
    
/// 9
    ppcon[27]  = ppcon[24];
    ppcon[28] =   3.15;
    ppcon[29] =   3.25;
    
//  10
    ppcon[30]  = ppcon[27]+4.5;
    ppcon[31] =   3.15;
    ppcon[32] =   3.25;

//  11
    ppcon[33] = ppcon[30];
    ppcon[34] =   3.15;
    ppcon[35] =   3.25;

//  12
    ppcon[36]  = ppcon[33];
    ppcon[37] =   3.15;
    ppcon[38] =   7.6;

//  13
    ppcon[39]  = ppcon[33]+0.4;
    ppcon[40] =   3.15;
    ppcon[41] =   7.6;

//  14
//    ppcon[39]  = ppcon[36];
//    ppcon[40] =   3.15;
//    ppcon[41] =   7.6;


    gMC->Gsvolu("0SUP", "PCON", idtmed[kAir], ppcon,42);
    z=-zdetC;
    gMC->Gspos("0SUP",1,"ALIC",0.,0.,z,idrotm[901],"ONLY");

 //-------------------------------------------------------------------
 //  START volume 
 //-------------------------------------------------------------------
  
    
    gMC->Gsvolu("0STR","PCON",idtmed[kAir],pstartR,18);
    gMC->Gsvolu("0STL","TUBE",idtmed[kAir],pstart,3);
    gMC->Gspos("0STR",1,"ALIC",0.,0.,-zdetC-pstart[2],idrotm[901],"ONLY");
    gMC->Gspos("0STL",1,"ALIC",0.,0.,zdetA+pstart[2],0,"ONLY");

//START interior
   gMC->Gsvolu("0INS","TUBE",idtmed[kAir],pinstart,3);
   gMC->Gsvolu("0PMT","TUBE",idtmed[kAir],ppmt,3);     
          
    gMC->Gsvolu("0SU1","TUBE",idtmed[kC],psupport1,3);//C kozhuh vnutri
    gMC->Gsvolu("0SU2","TUBE",idtmed[kC],psupport2,3);// snaruzhi  C
    gMC->Gsvolu("0SU3","TUBE",idtmed[kC],psupport3,3);//kryshka perednaiai  C
    gMC->Gsvolu("0SU4","TUBE",idtmed[kC],psupport3,3);//kryshka zadnaiai  C
    //    gMC->Gsvolu("0SU5","TUBE",idtmed[kAir],psupport4,3);// dyrki dlia feu v zadnej kryshke Air
    gMC->Gsvolu("0SU6","TUBE",idtmed[kC],psupport5,3);// stakanchik dlai feu  C
    gMC->Gsvolu("0SU7","TUBE",idtmed[kAl],psupport6,3);//kryshechka stakanchika  Al
    gMC->Gsvolu("0SU8","TUBE",idtmed[kAl],psupport7,3);//kolechko snaruzhu stakanchika Al
             
// first ring: 12 units of Scintillator+PMT+divider
  Float_t  theta  = (180 / TMath::Pi()) * TMath::ATan(6.5 / zdetC);
  Float_t angle  = 2 * TMath::Pi() / 12;
  Float_t phi[3];
    
   for (is=0; is<12; is++)
      {  

	x = 6.5 * TMath::Sin(is * angle);
	y = 6.5 * TMath::Cos(is * angle);
	
	phi[0] = -30 * is;
	phi[1] = 90 - is * 30;
	phi[2] = 90 - is * 30;
	for (Int_t j = 0; j < 3; j++)
	  if (phi[j] < 0)  phi[j] += 360;
	
	AliMatrix (idrotm[902 + is], 90.,         phi[0],
		   90. + theta, phi[1],
		   theta,       phi[2]);  
	z=-pstart[2]+pinstart[2]+0.2;
	gMC->Gspos ("0INS", is + 1, "0STR", x, y, z, idrotm[902 + is], "ONLY");
	gMC->Gspos ("0INS", is + 13, "0STL", x, y, z, 0, "ONLY");
      }	
   
      
   x=0;
   y=0;
    z=-pinstart[2]+ppmt[2]+psupport6[2]*2;
   gMC->Gspos("0PMT",1,"0INS",x,y,z,0,"ONLY");
   // PMT
   
   // Entry window (glass)
   gMC->Gsvolu("0TOP","TUBE",idtmed[kOpGlass],ptop,3); //glass
   z=-ppmt[2]+ptop[2];
   gMC->Gspos("0TOP",1,"0PMT",0,0,z,0,"ONLY");
   //metal volume to simulate reclection  
   gMC->Gsvolu("0TOO","TUBE",idtmed[kOpAir],ptopout,3); //glass
   gMC->Gspos("0TOO",1,"0PMT",0,0,z,0,"ONLY");

   //Fotokatod
   gMC->Gsvolu ("0REG", "TUBE", idtmed[kOpGlassCathode], preg, 3); 
   z = -ppmt[2] + 2 * ptop[2] + preg[2]; 
   gMC->Gspos ("0REG", 1, "0PMT", 0, 0, z, 0, "ONLY"); 
  // Bottom glass
   gMC->Gsvolu("0BOT","TUBE",idtmed[kGlass],pbot,3);
   z=ppmt[2]-pbot[2];
   gMC->Gspos("0BOT",1,"0PMT",0,0,z,0,"ONLY");
   // Side cylinder glass
   gMC->Gsvolu("0OUT","TUBE",idtmed[kGlass],pglass,3);
   z=ppmt[2]-pglass[2];
   gMC->Gspos("0OUT",1,"0PMT",0,0,z,0,"ONLY");
   //PMT electrodes support structure
   gMC->Gsvolu("0CER","TUBE",idtmed[kCer],pcer,3);
   gMC->Gsvolu("0STE","TUBE",idtmed[kSteel],psteel,3);
   z=-ppmt[2]+2*ptop[2]+0.3 + pcer[2];
   gMC->Gspos("0CER",1,"0PMT",0,0,z,0,"ONLY");
   z +=psteel[2]+pcer[2];
   gMC->Gspos("0STE",1,"0PMT",0,0,z,0,"ONLY");
    
   //Support  left side
   z=-pstart[2]+psupport1[2]+0.1;
   gMC->Gspos("0SU1",1,"0STR",0,0,z,0,"ONLY"); //C kozhuh snaruzhi
   gMC->Gspos("0SU2",1,"0STR",0,0,z,0,"ONLY"); //C kozhuh vnutri
   z=-pstart[2]+psupport3[2]+0.1;
   gMC->Gspos("0SU3",1,"0STR",0,0,z,0,"ONLY"); //peredniaia kryshka
   z=-pstart[2]+2.*psupport1[2]-0.05;//+0.1;
   gMC->Gspos("0SU4",1,"0STR",0,0,z,0,"MANY"); //zadnaiai kryshka
   gMC->Gspos("0SU6",1,"0INS",0,0,0,0,"ONLY");//C stakanchik dlia feu 
   z=-pinstart[2]+psupport6[2];
   gMC->Gspos("0SU7",1,"0INS",0,0,z,0,"ONLY"); //Al kryshechka 
   
   z=pinstart[2]-psupport7[2];
   gMC->Gspos("0SU8",1,"0INS",0,0,z,0,"ONLY"); //Al kolechko
   
   
   Float_t par[3];
   par[0]=4.4;
   par[1]=4.5;
   par[2]=0.5;
   gMC->Gsvolu("0SC0","TUBE",idtmed[kC],par,3);
   z=ppcon[3]+par[2];
   gMC->Gspos("0SC0",1,"0SUP",0,0,z,0,"ONLY"); 
   z += par[2];
   par[0]=4.4;
   par[1]=5.1;
   par[2]=0.05;
   gMC->Gsvolu("0SC1","TUBE",idtmed[kC],par,3);
   z += par[2];
   gMC->Gspos("0SC1",1,"0SUP",0,0,z,0,"ONLY"); 
   z=z+par[2];
   par[0]=4.9;
   par[1]=5.0;
   par[2]=6.9/2;
    gMC->Gsvolu("0SC2","TUBE",idtmed[kC],par,3);
    z += par[2];
    gMC->Gspos("0SC2",1,"0SUP",0,0,z,0,"ONLY"); 
    z += par[2];
   
     par[0]=3.15;
    par[1]=4.9;
    par[2]=0.1/2;
    gMC->Gsvolu("0SA1","TUBE",idtmed[kAl],par,3);
    
    z += par[2];
    gMC->Gspos("0SA1",1,"0SUP",0,0,z,0,"ONLY"); 
    z=z+par[2];
    par[0]=3.15;
    par[1]=3.16;
    par[2]=4.5/2;
    gMC->Gsvolu("0SA2","TUBE",idtmed[kAl],par,3);
    z += par[2];
    gMC->Gspos("0SA2",1,"0SUP",0,0,z,0,"ONLY"); 
    z=z+par[2];
    par[0]=3.16; // eta chast' prikruchena k absorberu
    par[1]=7.5;
    par[2]=0.2;
    gMC->Gsvolu("0SA3","TUBE",idtmed[kAl],par,3);
    z += par[2];
    gMC->Gspos("0SA3",1,"0SUP",0,0,z,0,"ONLY"); 
    par[0]=3.16; // gvozdi eta chast' prikruchena k absorberu
    par[1]=7.5;
    par[2]=0.01;
    gMC->Gsvolu("0SN2","TUBE",idtmed[kSteel],par,3);
    gMC->Gspos("0SN2",1,"0SUP",0,0,z,0,"ONLY"); 
         
 
}    
//------------------------------------------------------------------------
void AliSTARTv1::CreateMaterials()
{
   Int_t isxfld   = gAlice->Field()->Integ();
   Float_t sxmgmx = gAlice->Field()->Max();
   //   Float_t a,z,d,radl,absl,buf[1];
   // Int_t nbuf;
   Int_t *idtmed = fIdtmed->GetArray();

// AIR
                                                                                
   Float_t aAir[4]={12.0107,14.0067,15.9994,39.948};
   Float_t zAir[4]={6.,7.,8.,18.};
   Float_t wAir[4]={0.000124,0.755267,0.231781,0.012827};
   Float_t dAir = 1.20479E-3;
                                                                                
// Scintillator CH
   Float_t ascin[2]={1.01,12.01};
   Float_t zscin[2]={1,6};
   Float_t wscin[2]={1,1};
   Float_t denscin=1.03;
//Lucite C(CH3)CO2CH3
   Float_t alucite[3]={1.01,12.01,15.999};
   Float_t zlucite[3]={1,6,8};
   Float_t wlucite[3]={8,5,2};
   Float_t denlucite=1.16;
 // PMT glass SiO2
   Float_t aglass[2]={28.0855,15.9994};
   Float_t zglass[2]={14.,8.};
   Float_t wglass[2]={1.,2.};
   Float_t dglass=2.65;
// Ceramic   97.2% Al2O3 , 2.8% SiO2
   // Float_t wcer[2]={0.972,0.028};
   Float_t aCeramic[2]  = { 26.981539,15.9994 };
   Float_t zCeramic[2]  = { 13.,8. };
   Float_t wCeramic[2]  = { 2.,3. };
   Float_t denscer  = 3.6;

// Brass 80% Cu, 20% Zn
   Float_t abrass[2] = {63.546,65.39};
   Float_t zbrass[2] = {29,30};
   Float_t wbrass[2] = {0.8,0.2};
   Float_t denbrass=8.96;

//Ribber C6H12S
   Float_t aribber[3] = {12.,1.,32.};
   Float_t zribber[3] = {6.,1.,16.};
   Float_t wribber[3] = {6.,12.,1.};
   Float_t denribber=0.8;
// Support inside 
   Float_t asupport[2] = {12.,1.};
   Float_t zsupport[2] = {6.,1.};
   Float_t wsupport[2] = {1.,1.};
   Float_t densupport=0.1;
    
//*** Definition Of avaible START materials ***
   AliMaterial(0, "Steel$", 55.850,26.,7.87,1.76,999);
   AliMaterial(1, "Vacuum$", 1.e-16,1.e-16,1.e-16,1.e16,999);
   AliMixture(2, "Air$", aAir, zAir, dAir,4,wAir);
   AliMaterial(10, "CarbonPlastic$", 12.01, 6.0, 2.26, 18.8,999); 
   AliMaterial(11, "Aliminium$", 26.98, 13.0, 2.7, 8.9,999); 

   AliMixture( 3, "Ceramic  $",aCeramic, zCeramic, denscer, -2, wCeramic);
   AliMixture( 4, "PMT glass   $",aglass,zglass,dglass,-2,wglass);
   /* 
  char namate[21]="";
  
   gMC->Gfmate((*fIdmate)[3], namate, a, z, d, radl, absl, buf, nbuf);
   acer[0]=a;  

   zcer[0]=z;
   gMC->Gfmate((*fIdmate)[4], namate, a, z, d, radl, absl, buf, nbuf);
   acer[1]=a;
   zcer[1]=z;
   AliMixture( 11, "Ceramic    $", acer, zcer, denscer, 2, wcer);
   */ 
    AliMixture( 5, "Scintillator$",ascin,zscin,denscin,-2,wscin);
   AliMixture( 6, "Brass    $", abrass, zbrass, denbrass, 2, wbrass);
   AliMixture( 7, "Ribber $",aribber,zribber,denribber,-3,wribber);
   AliMixture( 8, "Lucite$",alucite,zlucite,denlucite,-3,wlucite);
   AliMixture( 9, "Penoplast$",asupport,zsupport,densupport,-2,wsupport);
   AliMixture( 21, "PMT Optical glass   $",aglass,zglass,dglass,-2,wglass);
   AliMixture( 24, "PMT Optical glass cathode $",aglass,zglass,dglass,-2,wglass);
    AliMixture(22, "START Opt Air$", aAir, zAir, dAir,4,wAir);
   AliMixture(23, "START Opt Air Next$", aAir, zAir, dAir,4,wAir);
   
   AliMedium(1, "START Air$", 2, 0, isxfld, sxmgmx, 10., .1, 1., .003, .003);
   AliMedium(2, "Scintillator$", 5, 1, isxfld, sxmgmx, 10., .01, 1., .003, .003);
   AliMedium(3, "Vacuum$", 1, 0, isxfld, sxmgmx, 10., .01, .1, .003, .003);
   AliMedium(4, "Ceramic$", 3, 0, isxfld, sxmgmx, 10., .01, .1, .003, .003);
   AliMedium(6, "Glass$", 4, 1, isxfld, sxmgmx, 10., .01, .1, .003, .003);
   AliMedium(8, "Steel$", 0, 0, isxfld, sxmgmx, 1., .001, 1., .001, .001);
   AliMedium(9, "Ribber  $", 7, 0, isxfld, sxmgmx, 10., .01, .1, .003, .003);
   AliMedium(11, "Brass  $", 6, 0, isxfld, sxmgmx, 10., .01, .1, .003, .003);
   AliMedium(12, "Lucite$", 8, 1, isxfld, sxmgmx, 10., .01, 1., .003, .003);  
   AliMedium(13, "CarbonPlastic$", 10, 0, isxfld, sxmgmx, 10., .01, 1., .003, .003);  
   AliMedium(14, "PenoPlast$", 9, 0, isxfld, sxmgmx, 10., .01, 1., .003, .003);  
   AliMedium(15, "Aluminium$", 11, 0, isxfld, sxmgmx, 10., .01, 1., .003, .003);  
   AliMedium(16, "OpticalGlass$", 21, 1, isxfld, sxmgmx, 10., .01, .1, .003, .003);
   AliMedium(17, "START OpAir$", 22, 0, isxfld, sxmgmx, 10., .1, 1., .003, .003);
   AliMedium(18, "START OpAirNext$", 23, 0, isxfld, sxmgmx, 10., .1, 1., .003, .003);
    AliMedium(19, "OpticalGlassCathode$", 24, 1, isxfld, sxmgmx, 10., .01, .1, .003, .003);


// Definition Cherenkov parameters
   int i;
   const Int_t kNbins=31;
   
   Float_t rindexSiO2[kNbins],  efficAll[kNbins], rindexAir[kNbins], absorAir[kNbins],rindexCathodeNext[kNbins], absorbCathodeNext[kNbins];
            
   // quartz 20mm
   Float_t aAbsSiO2[kNbins]={29.0, 28.6, 28.3, 27.7, 27.3, 26.7, 26.4, 
			     25.9, 25.3, 24.9, 24.5, 23.7, 
			     23.2, 22.8, 22.4, 21.8, 21.3,
			     22.8, 22.1, 21.7, 21.2, 20.5, 
			     19.9, 19.3, 18.7, 18.0, 17.1, 
			     16.3, 15.3, 14.3, 14.3   };
          
   Float_t aPckov[kNbins]  ={3.87, 3.94, 4.02, 4.11, 4.19, 4.29, 4.38,
			     4.48, 4.58, 4.69, 4.81, 4.93, 
			     5.05, 5.19, 5.33, 5.48, 5.63,
			     5.8,  5.97, 6.16, 6.36, 6.57, 
			     6.8,  7.04, 7.3,  7.58, 7.89, 
			     8.22, 8.57, 8.97, 9.39 };  
   /*     
   Float_t effCathode[kNbins]={0.11, 0.13, 0.15, 0.16, 0.18, 0.19, 0.20,
			      0.21, 0.22, 0.23, 0.24, 0.26, 
			      0.27, 0.29, 0.30, 0.29, 0.29, 
			      0.28, 0.28, 0.27, 0.26, 0.25, 
			      0.25, 0.23, 0.20, 0.19, 0.17,
			      0.17, 0.17, 0.2, 0.23};
   */     
   //  Float_t aAbsSiO2[kNbins]; //quartz 30mm
  for(i=0;i<kNbins;i++)
    {
      aPckov[i]=aPckov[i]*1e-9;//Photons energy bins 4 eV - 8.5 eV step 0.1 eV   
      rindexAir[i]=0;
      rindexSiO2[i]=1.458; //refractive index for qwarts
      rindexCathodeNext[i]=0;
      efficAll[i]=1.;

      //      aAbsSiO2[i]=28.5; //quartz 30mm
      absorAir[i]=0.3;      
      absorbCathodeNext[i]=0;

    }
  
  
   gMC->SetCerenkov (idtmed[kOpGlass], kNbins, aPckov, aAbsSiO2, efficAll, rindexSiO2 );
   // gMC->SetCerenkov (idtmed[kOpGlassCathode], kNbins, aPckov, aAbsSiO2, effCathode, rindexSiO2 );
   gMC->SetCerenkov (idtmed[kOpGlassCathode], kNbins, aPckov, aAbsSiO2,efficAll , rindexSiO2 );
  gMC->SetCerenkov (idtmed[kOpAir], kNbins, aPckov,absorAir , efficAll,rindexAir );
   gMC->SetCerenkov (idtmed[kOpAirNext], kNbins, aPckov,absorbCathodeNext , efficAll, rindexCathodeNext);
   
   AliDebugClass(1,": ++++++++++++++Medium set++++++++++");
   
   
}
//---------------------------------------------------------------------
void AliSTARTv1::DrawDetector()
{
//
// Draw a shaded view of the Forward multiplicity detector version 0
//
  
  //Set ALIC mother transparent
  gMC->Gsatt("ALIC","SEEN",0);
  //
  //Set volumes visible
  //  gMC->Gsatt("0STR","SEEN",0);
  //  gMC->Gsatt("0INS","SEEN",0);
  // gMC->Gsatt("0PMT","SEEN",1);
  // gMC->Gsatt("0DIV","SEEN",1);
  //
  gMC->Gdopt("hide","off");
  gMC->Gdopt("shad","on");
  gMC->SetClipBox(".");
  gMC->SetClipBox("*",0,1000,-1000,1000,-1000,1000);
  gMC->DefaultRange();
  gMC->Gdraw("alic",90,0,0,-35,9.5,.6,0.6);
  //gMC->Gdraw("alic",0,0,0,10,9.5,.8,0.8); //other side view
  gMC->Gdhead(1111,"T-Zero detector");
  gMC->Gdopt("hide","off");
}

//-------------------------------------------------------------------
void AliSTARTv1::Init()
{
// Initialises version 0 of the Forward Multiplicity Detector
//
//Int_t *idtmed  = gAlice->Idtmed();
  AliSTART::Init();
  fIdSens1=gMC->VolId("0REG");

   AliDebug(1,Form("%s: *** START version 1 initialized ***\n",ClassName()));

}

//-------------------------------------------------------------------

void AliSTARTv1::StepManager()
{
  //
  // Called for every step in the START Detector
  //
  Int_t id,copy,copy1;
  static Float_t hits[6];
  static Int_t vol[2];
  TLorentzVector pos;
  
  //   TClonesArray &lhits = *fHits;
  
  if(!gMC->IsTrackAlive()) return; // particle has disappeared
  
// If particles is photon then ...
  
 if (gMC->TrackPid() == 50000050)
  {
      id=gMC->CurrentVolID(copy);
      
      
      // Check the sensetive volume
      if(id==fIdSens1 ) { 
	if(gMC->IsTrackEntering()) {
	  gMC->CurrentVolOffID(2,copy);
	  vol[1]=copy;
	  gMC->CurrentVolOffID(3,copy1);
	  vol[0]=copy1;
	  gMC->TrackPosition(pos);
	  hits[0] = pos[0];
	  hits[1] = pos[1];
	  hits[2] = pos[2];
	  if(pos[2]<0) vol[0]=2;
	  if(pos[2]>=0) vol[0]=1; 
	  
	  Float_t etot=gMC->Etot();
	  hits[3]=etot;
	  Int_t iPart= gMC->TrackPid();
	  Int_t partID=gMC->IdFromPDG(iPart);
	  hits[4]=partID;
	  Float_t ttime=gMC->TrackTime();
	  hits[5]=ttime*1e12;
	  AddHit(fIshunt,vol,hits);
	  //  cout<< gAlice->GetMCApp()->GetCurrentTrackNumber()<<" hit added "<<endl;
	}
	/*		
		printf("track(%i) alive(%i) disap(%i) enter(%i) exit(%i) inside(%i) out(%i) stop(%i) new(%i) \n",
		       gAlice->GetMCApp()->GetCurrentTrackNumber(),
	       gMC->IsTrackAlive(),
	       gMC->IsTrackDisappeared(),
	       gMC->IsTrackEntering(),
	       gMC->IsTrackExiting(),
	       gMC->IsTrackInside(),
	       gMC->IsTrackOut(),
	       gMC->IsTrackStop(),
	       gMC->IsNewTrack());
	*/		
      } //sensitive
  } //photon
}