[u/mrichter/AliRoot.git] / PHOS / AliPHOSv4.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.                  *
 **************************************************************************/

/* $Id$ */

//_________________________________________________________________________
// Implementation of the PHOS manager class for fast simulations     
// Tracks particles until the reach a grossly designed PHOS module
// Modify the particles property (momentum, energy, type) according to
//  the PHOS response function. The result is called a virtual reconstructed
//  particle.                
//
//*-- Author: Yves Schutz (SUBATECH)

// --- ROOT system ---

#include "TBRIK.h"
#include "TNode.h"
#include "TParticle.h"
#include "TTree.h"
#include "TGeometry.h"
#include "TFile.h"

// --- Standard library ---

// --- AliRoot header files ---
#include "AliPHOSFastRecParticle.h"
#include "AliPHOSGeometry.h"
#include "AliPHOSv4.h"
#include "AliPHOSGetter.h"
#include "AliRun.h"
#include "AliConst.h"
#include "AliMC.h"

ClassImp(AliPHOSv4)

//____________________________________________________________________________
AliPHOSv4::AliPHOSv4() : AliPHOS()
{
  // default ctor : initialize data member
   fBigBoxX = 0. ;                      
   fBigBoxY = 0. ;                      
   fBigBoxZ = 0. ;                       
   fFastRecParticles = 0 ;        
   fNRecParticles = 0 ;                
   fRan = 0 ;                            
   fResPara1 = 0. ;                       
   fResPara2 = 0. ;                        
   fResPara3 = 0. ;                      
   fPosParaA0 = 0. ;                      
   fPosParaA1 = 0. ;
   fPosParaB0 = 0. ;     
   fPosParaB1 = 0. ;    
   fPosParaB2 = 0. ;    

}

//____________________________________________________________________________
AliPHOSv4::AliPHOSv4(const char *name, const char *title):
  AliPHOS(name,title)
{
  // ctor

  
  // create the geometry parameters object  
  // and post it to a folder (Post retrieves the correct geometry)
  AliPHOSGetter::GetInstance(gDirectory->GetName(), 0)->PostGeometry() ;    
    
    SetBigBox(0, GetGeometry()->GetOuterBoxSize(0) ) ;
    SetBigBox(1, GetGeometry()->GetOuterBoxSize(1) + GetGeometry()->GetCPVBoxSize(1) ) ; 
    SetBigBox(2, GetGeometry()->GetOuterBoxSize(0) ); 
    
    fNRecParticles = 0 ; 
    fFastRecParticles = new AliPHOSFastRecParticle::FastRecParticlesList("AliPHOSFastRecParticle", 100) ;

    fResPara1 = 0.030 ;    // GeV
    fResPara2 = 0.00003 ; 
    fResPara3 = 0.00001 ; 
    
    fPosParaA0 = 2.87 ;    // mm
    fPosParaA1 = -0.0975 ;  
    fPosParaB0 = 0.257 ;   
    fPosParaB1 = 0.137 ; 
    fPosParaB2 = 0.00619 ; 
}

//____________________________________________________________________________
AliPHOSv4::~AliPHOSv4()
{
  // dtor
 
  fFastRecParticles->Delete() ; 
  delete fFastRecParticles ;
  fFastRecParticles = 0 ; 

}

//____________________________________________________________________________
void AliPHOSv4::AddRecParticle(const AliPHOSFastRecParticle & rp)
{  
  // Add a virtually reconstructed particle to the list 

  new( (*fFastRecParticles)[fNRecParticles] ) AliPHOSFastRecParticle(rp) ;
  fNRecParticles++ ; 
}

//____________________________________________________________________________
void AliPHOSv4::BuildGeometry()
{
  // Build the PHOS geometry for the ROOT display
   //BEGIN_HTML
  /*
    <H2>
     PHOS FAST in ALICE displayed by root
    </H2>
    <H4> All Views </H4>
    <P>
    <CENTER>
    <IMG Align=BOTTOM ALT="Fast All Views" SRC="../images/AliPHOSv4AllViews.gif"> 
    </CENTER></P>
    <H4> Front View </H4>
    <P>
    <CENTER>
    <IMG Align=BOTTOM ALT="Fast Front View" SRC="../images/AliPHOSv4FrontView.gif"> 
    </CENTER></P>
  */
  //END_HTML  
 
  const Int_t kColorPHOS = kRed ;
  
  Double_t const kRADDEG = 180.0 / kPI ;
  
  new TBRIK( "BigBox", "PHOS box", "void", GetBigBox(0)/2, 
	     GetBigBox(1)/2, 
	     GetBigBox(2)/2 );
  
  // position PHOS into ALICE

  Float_t r = GetGeometry()->GetIPtoCrystalSurface() + GetBigBox(1) / 2.0 ;
  Int_t number = 988 ; 
  Float_t pphi =  TMath::ATan( GetBigBox(0)  / ( 2.0 * GetGeometry()->GetIPtoCrystalSurface() ) ) ;
  pphi *= kRADDEG ;
  TNode * top = gAlice->GetGeometry()->GetNode("alice") ;
 
  char * nodename = new char[20] ;  
  char * rotname  = new char[20] ; 

  for( Int_t i = 1; i <= GetGeometry()->GetNModules(); i++ ) { 
   Float_t angle = pphi * 2 * ( i - GetGeometry()->GetNModules() / 2.0 - 0.5 ) ;
   sprintf(rotname, "%s%d", "rot", number++) ;
   new TRotMatrix(rotname, rotname, 90, angle, 90, 90 + angle, 0, 0);
   top->cd();
   sprintf(nodename,"%s%d", "Module", i) ;    
   Float_t x =  r * TMath::Sin( angle / kRADDEG ) ;
   Float_t y = -r * TMath::Cos( angle / kRADDEG ) ;
   TNode * bigboxnode = new TNode(nodename, nodename, "BigBox", x, y, 0, rotname ) ;
   bigboxnode->SetLineColor(kColorPHOS) ;
   fNodes->Add(bigboxnode) ;
  }
  delete[] nodename ; 
  delete[] rotname ; 
}

//____________________________________________________________________________
void AliPHOSv4::CreateGeometry()
{
  // Create the geometry for GEANT
  
  AliPHOSv4 *phostmp = dynamic_cast<AliPHOSv4*>(gAlice->GetModule("PHOS")) ;
  
  if ( phostmp == NULL ) {
    
    fprintf(stderr, "PHOS detector not found!\n") ;
    return ;
    
  }

  // Get pointer to the array containing media indeces
  Int_t *idtmed = fIdtmed->GetArray() - 699 ;
  
  Float_t bigbox[3] ; 
  bigbox[0] =   GetBigBox(0) / 2.0 ;
  bigbox[1] =   GetBigBox(1) / 2.0 ;
  bigbox[2] =   GetBigBox(2) / 2.0 ;
  
  gMC->Gsvolu("PHOS", "BOX ", idtmed[798], bigbox, 3) ;
  
  // --- Position  PHOS mdules in ALICE setup ---
  
  Int_t idrotm[99] ;
  Double_t const kRADDEG = 180.0 / kPI ;
  
  for( Int_t i = 1; i <= GetGeometry()->GetNModules(); i++ ) {
    
    Float_t angle = GetGeometry()->GetPHOSAngle(i) ;
    AliMatrix(idrotm[i-1], 90.0, angle, 90.0, 90.0+angle, 0.0, 0.0) ;
 
    Float_t r = GetGeometry()->GetIPtoCrystalSurface() + GetBigBox(1) / 2.0 ;

    Float_t xP1 = r * TMath::Sin( angle / kRADDEG ) ;
    Float_t yP1 = -r * TMath::Cos( angle / kRADDEG ) ;
    gMC->Gspos("PHOS", i, "ALIC", xP1, yP1, 0.0, idrotm[i-1], "ONLY") ;
 
  } // for GetNModules

}


//____________________________________________________________________________
void AliPHOSv4::Init(void)
{
  // Prints out an information message
  
  Int_t i;

  printf("\n");
  for(i=0;i<35;i++) printf("*");
  printf(" FAST PHOS_INIT ");
  for(i=0;i<35;i++) printf("*");
  printf("\n");

  // Here the PHOS initialisation code (if any!)

  for(i=0;i<80;i++) printf("*");
  printf("\n");
  
}

//___________________________________________________________________________
Float_t AliPHOSv4::GetBigBox(Int_t index) const
{
  // Get the X, Y or Z dimension of the box describing a PHOS module
  
  Float_t rv = 0 ; 

  switch (index) {
  case 0:
    rv = fBigBoxX ; 
    break ; 
  case 1:
     rv = fBigBoxY ; 
    break ; 
  case 2:
     rv = fBigBoxZ ; 
    break ; 
 }
  return rv ; 
}

//___________________________________________________________________________
void AliPHOSv4::MakeBranch(Option_t* opt, const char *file)
{  
  // Create new branch in the current reconstructed Root Tree
 
  AliDetector::MakeBranch(opt,file) ;
  
  char branchname[10];
  sprintf(branchname,"%s",GetName());
  const char *cd = strstr(opt,"R");
  
  if (fFastRecParticles && gAlice->TreeR() && cd) {
    MakeBranchInTree(gAlice->TreeR(), 
                     branchname, &fFastRecParticles, fBufferSize, file);
  }
}

//____________________________________________________________________________
Double_t AliPHOSv4::MakeEnergy(const Double_t energy)
{  
  // Smears the energy according to the energy dependent energy resolution.
  // A gaussian distribution is assumed

  Double_t sigma  = SigmaE(energy) ; 
  return  fRan.Gaus(energy, sigma) ;   
}

//____________________________________________________________________________
TVector3 AliPHOSv4::MakePosition(const Double_t energy, const TVector3 pos, const Double_t theta, const Double_t phi)
{
  // Smears the impact position according to the energy dependent position resolution
  // A gaussian position distribution is assumed

  TVector3 newpos ;
  Double_t sigma = SigmaP( energy, theta*180./TMath::Pi() ) ;
  Double_t x = fRan.Gaus( pos.X(), sigma ) ;
  sigma = SigmaP( energy, phi*180./TMath::Pi() ) ;
  Double_t z = fRan.Gaus( pos.Z(), sigma ) ;
  Double_t y = pos.Y() ; 
  
  newpos.SetX(x) ; 
  newpos.SetY(y) ; 
  newpos.SetZ(z) ; 
	      
  return newpos ; 
}

//____________________________________________________________________________
void AliPHOSv4::MakeRecParticle(const Int_t modid, const TVector3 pos, AliPHOSFastRecParticle & rp)
{
  // Modify the primary particle properties according
  //  1. the response function of PHOS
  //  2. the performance of the EMC+PPSD setup
  
  Int_t type = MakeType( rp ) ;
  rp.SetType(type) ;

  
  // get the detected energy

  TLorentzVector momentum ;  
  rp.Momentum(momentum) ; 
  Double_t kineticenergy = TMath::Sqrt( TMath::Power(momentum.E(), 2) - TMath::Power(rp.GetMass(), 2) ) ; 
  Double_t modifiedkineticenergy = MakeEnergy(kineticenergy ) ;
  Double_t modifiedenergy = TMath::Sqrt( TMath::Power(modifiedkineticenergy, 2)  
					 + TMath::Power( rp.GetMass(), 2) ) ;
 
  // get the angle of incidence 
  
  Double_t incidencetheta = 90. * TMath::Pi() /180 - rp.Theta() ; 
  Double_t incidencephi   = ( 270 + GetGeometry()->GetPHOSAngle(modid) ) * TMath::Pi() / 180. - rp.Phi() ;   

  // get the detected direction
  
  TVector3 modifiedposition = MakePosition(kineticenergy, pos, incidencetheta, incidencephi) ; 
  modifiedposition *= modifiedkineticenergy / modifiedposition.Mag() ; 

  // Set the modified 4-momentum of the reconstructed particle

  rp.SetMomentum(modifiedposition.X(), modifiedposition.Y(), modifiedposition.Z(), modifiedenergy) ; 

 }

//____________________________________________________________________________
Int_t AliPHOSv4::MakeType(AliPHOSFastRecParticle & rp )
{
  // Generate a particle type using the performance of the EMC+PPSD setup

  Int_t rv =   AliPHOSFastRecParticle::kUNDEFINED ;
  Int_t charge = (Int_t)rp.GetPDG()->Charge() ;
  Int_t test ; 
  Float_t ran ; 
  if ( charge != 0 && ( TMath::Abs(rp.GetPdgCode()) != 11 ) ) 
    test = - 1 ;
  else
    test = rp.GetPdgCode() ; 

  switch (test) { 

  case 22:    // it's a photon
    ran = fRan.Rndm() ; 
    if ( ran <= 0.5 )  // 50 % 
      rv =  AliPHOSFastRecParticle::kGAMMA ; 
    else {
      ran = fRan.Rndm() ; 
      if( ran <= 0.9498 )
	rv =  AliPHOSFastRecParticle::kNEUTRALEM ; 
      else
	rv =  AliPHOSFastRecParticle::kNEUTRALHA ; 
    }     
    break ; 

  case 2112:  // it's a neutron
    ran = fRan.Rndm() ; 
    if ( ran <= 0.9998 )
      rv =  AliPHOSFastRecParticle::kNEUTRALHA ; 
    else 
      rv = AliPHOSFastRecParticle::kNEUTRALEM ; 
    break ; 

  case -2112: // it's a anti-neutron
    ran = fRan.Rndm() ; 
    if ( ran <= 0.9984 )
      rv =  AliPHOSFastRecParticle::kNEUTRALHA ; 
    else 
      rv =  AliPHOSFastRecParticle::kNEUTRALEM ; 
    break ; 
    
  case 11:    // it's a electron
    ran = fRan.Rndm() ; 
    if ( ran <= 0.9996 )
      rv =  AliPHOSFastRecParticle::kELECTRON ; 
    else 
      rv =  AliPHOSFastRecParticle::kCHARGEDHA ; 
    break; 

  case -11:   // it's a positon
    ran = fRan.Rndm() ; 
    if ( ran <= 0.9996 )
      rv =  AliPHOSFastRecParticle::kELECTRON ; 
    else 
      rv =  AliPHOSFastRecParticle::kCHARGEDHA ; 
    break; 

  case -1:    // it's a charged
    ran = fRan.Rndm() ; 
    if ( ran <= 0.9996 )
      rv =  AliPHOSFastRecParticle::kCHARGEDHA ; 
    else 
      rv =  AliPHOSFastRecParticle::kGAMMA ; 

    break ; 
  }
    
  
  return rv ;
}

//___________________________________________________________________________
void AliPHOSv4::ResetPoints()
{
  // This overloads the method in AliDetector
  
  ResetFastRecParticles() ; 
}

//___________________________________________________________________________
void AliPHOSv4::ResetFastRecParticles()
{
  // Resets the list of virtual reconstructed particles
 
  if (fFastRecParticles) 
    fFastRecParticles->Clear() ;
  fNRecParticles = 0 ; 
}

//___________________________________________________________________________
void AliPHOSv4::SetBigBox(Int_t index, Float_t value)
{
  // Set the size of the Box describing a PHOS module
  
  switch (index) {
  case 0:
    fBigBoxX = value ; 
    break ; 
  case 1:
    fBigBoxY = value ; 
    break ; 
  case 2:
    fBigBoxZ = value ; 
    break ; 
 }

}

//____________________________________________________________________________
Double_t AliPHOSv4::SigmaE(Double_t energy)
{
  // Calculates the energy dependent energy resolution
  
  Double_t rv = -1 ; 
  
  rv = TMath::Sqrt( TMath::Power(fResPara1/energy, 2) 
	       + TMath::Power(fResPara2/TMath::Sqrt(energy), 2) 
	       + TMath::Power(fResPara3, 2) ) ;  

  return rv * energy ; 
}

//____________________________________________________________________________
Double_t AliPHOSv4::SigmaP(Double_t energy, Double_t incidence)
{
  // Calculates the energy dependent position resolution 

  Double_t paraA = fPosParaA0 + fPosParaA1 * incidence ; 
  Double_t paraB = fPosParaB0 + fPosParaB1 * incidence + fPosParaB2 * incidence * incidence ; 

  return ( paraA / TMath::Sqrt(energy) + paraB ) * 0.1   ; // in cm  
}

//____________________________________________________________________________
void AliPHOSv4::StepManager(void)
{
  // Only verifies if the particle reaches PHOS and stops the tracking 

  Int_t primary =  gAlice->GetPrimary( gAlice->CurrentTrack() ); 

  TLorentzVector lv ; 
  gMC->TrackPosition(lv) ;
  TVector3 pos = lv.Vect() ; 
  Int_t modid  ; 
  gMC->CurrentVolID(modid);
  
  Float_t energy = gMC->Etot() ; //Total energy of current track

  //Calculating mass of current particle
  TDatabasePDG * pdg = TDatabasePDG::Instance() ;
  TParticlePDG * partPDG = pdg->GetParticle(gMC->TrackPid()) ;
  Float_t mass = partPDG->Mass() ;

  if(energy > mass){
    pos.SetMag(TMath::Sqrt(energy*energy-mass*mass)) ;
    TLorentzVector pTrack(pos, energy) ;  

    TParticle * part = new TParticle(gMC->TrackPid(), 0,-1,-1,-1,-1, pTrack, lv)  ;
        
    AliPHOSFastRecParticle rp(*part) ;
    rp.SetPrimary(primary) ; 

    // Adds the response of PHOS to the particle
    MakeRecParticle(modid, pos, rp) ;
    
    // add the `track' particle to the FastRecParticles list
  
    AddRecParticle(rp) ;

    part->Delete() ;
  }
  // stop the track as soon PHOS is reached
  
  gMC->StopTrack() ; 

}
Commit	Line	Data
5f20d3fb	1	/**************************************************************************
	2	* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
	3	* *
	4	* Author: The ALICE Off-line Project. *
	5	* Contributors are mentioned in the code where appropriate. *
	6	* *
	7	* Permission to use, copy, modify and distribute this software and its *
	8	* documentation strictly for non-commercial purposes is hereby granted *
	9	* without fee, provided that the above copyright notice appears in all *
	10	* copies and that both the copyright notice and this permission notice *
	11	* appear in the supporting documentation. The authors make no claims *
	12	* about the suitability of this software for any purpose. It is *
	13	* provided "as is" without express or implied warranty. *
	14	**************************************************************************/
	15
	16	/* $Id$ */
	17
	18	//_________________________________________________________________________
	19	// Implementation of the PHOS manager class for fast simulations
	20	// Tracks particles until the reach a grossly designed PHOS module
	21	// Modify the particles property (momentum, energy, type) according to
	22	// the PHOS response function. The result is called a virtual reconstructed
	23	// particle.
	24	//
	25	//*-- Author: Yves Schutz (SUBATECH)
	26
	27	// --- ROOT system ---
	28
	29	#include "TBRIK.h"
	30	#include "TNode.h"
	31	#include "TParticle.h"
94de3818	32	#include "TTree.h"
94de3818	33	#include "TGeometry.h"
2ab0c725	34	#include "TFile.h"
5f20d3fb	35
	36	// --- Standard library ---
	37
5f20d3fb	38	// --- AliRoot header files ---
cede8016	39	#include "AliPHOSFastRecParticle.h"
cede8016	40	#include "AliPHOSGeometry.h"
5f20d3fb	41	#include "AliPHOSv4.h"
7b7c1533	42	#include "AliPHOSGetter.h"
5f20d3fb	43	#include "AliRun.h"
5f20d3fb	44	#include "AliConst.h"
94de3818	45	#include "AliMC.h"
5f20d3fb	46
	47	ClassImp(AliPHOSv4)
	48
735e58f1	49	//____________________________________________________________________________
33faac69	50	AliPHOSv4::AliPHOSv4() : AliPHOS()
735e58f1	51	{
	52	// default ctor : initialize data member
	53	fBigBoxX = 0. ;
	54	fBigBoxY = 0. ;
	55	fBigBoxZ = 0. ;
	56	fFastRecParticles = 0 ;
	57	fNRecParticles = 0 ;
	58	fRan = 0 ;
	59	fResPara1 = 0. ;
	60	fResPara2 = 0. ;
	61	fResPara3 = 0. ;
	62	fPosParaA0 = 0. ;
	63	fPosParaA1 = 0. ;
	64	fPosParaB0 = 0. ;
	65	fPosParaB1 = 0. ;
	66	fPosParaB2 = 0. ;
	67
	68	}
	69
5f20d3fb	70	//____________________________________________________________________________
	71	AliPHOSv4::AliPHOSv4(const char name, const char title):
	72	AliPHOS(name,title)
	73	{
	74	// ctor
	75
7b7c1533	76
	77	// create the geometry parameters object
	78	// and post it to a folder (Post retrieves the correct geometry)
c4864d2c	79	AliPHOSGetter::GetInstance(gDirectory->GetName(), 0)->PostGeometry() ;
aafe457d	80
fa7cce36	81	SetBigBox(0, GetGeometry()->GetOuterBoxSize(0) ) ;
	82	SetBigBox(1, GetGeometry()->GetOuterBoxSize(1) + GetGeometry()->GetCPVBoxSize(1) ) ;
	83	SetBigBox(2, GetGeometry()->GetOuterBoxSize(0) );
aafe457d	84
	85	fNRecParticles = 0 ;
	86	fFastRecParticles = new AliPHOSFastRecParticle::FastRecParticlesList("AliPHOSFastRecParticle", 100) ;
5cbba5aa	87
aafe457d	88	fResPara1 = 0.030 ; // GeV
	89	fResPara2 = 0.00003 ;
	90	fResPara3 = 0.00001 ;
	91
	92	fPosParaA0 = 2.87 ; // mm
	93	fPosParaA1 = -0.0975 ;
	94	fPosParaB0 = 0.257 ;
	95	fPosParaB1 = 0.137 ;
	96	fPosParaB2 = 0.00619 ;
5f20d3fb	97	}
	98
	99	//____________________________________________________________________________
	100	AliPHOSv4::~AliPHOSv4()
	101	{
	102	// dtor
	103
	104	fFastRecParticles->Delete() ;
	105	delete fFastRecParticles ;
	106	fFastRecParticles = 0 ;
	107
	108	}
	109
	110	//____________________________________________________________________________
	111	void AliPHOSv4::AddRecParticle(const AliPHOSFastRecParticle & rp)
	112	{
	113	// Add a virtually reconstructed particle to the list
	114
	115	new( (*fFastRecParticles)[fNRecParticles] ) AliPHOSFastRecParticle(rp) ;
	116	fNRecParticles++ ;
	117	}
	118
	119	//____________________________________________________________________________
	120	void AliPHOSv4::BuildGeometry()
	121	{
	122	// Build the PHOS geometry for the ROOT display
	123	//BEGIN_HTML
	124	/*
	125	<H2>
	126	PHOS FAST in ALICE displayed by root
	127	</H2>
	128	<H4> All Views </H4>
	129	<P>
	130	<CENTER>
	131	<IMG Align=BOTTOM ALT="Fast All Views" SRC="../images/AliPHOSv4AllViews.gif">
	132	</CENTER></P>
	133	<H4> Front View </H4>
	134	<P>
	135	<CENTER>
	136	<IMG Align=BOTTOM ALT="Fast Front View" SRC="../images/AliPHOSv4FrontView.gif">
	137	</CENTER></P>
	138	*/
	139	//END_HTML
	140
	141	const Int_t kColorPHOS = kRed ;
	142
	143	Double_t const kRADDEG = 180.0 / kPI ;
	144
	145	new TBRIK( "BigBox", "PHOS box", "void", GetBigBox(0)/2,
	146	GetBigBox(1)/2,
	147	GetBigBox(2)/2 );
	148
	149	// position PHOS into ALICE
	150
fa7cce36	151	Float_t r = GetGeometry()->GetIPtoCrystalSurface() + GetBigBox(1) / 2.0 ;
5f20d3fb	152	Int_t number = 988 ;
fa7cce36	153	Float_t pphi = TMath::ATan( GetBigBox(0) / ( 2.0 * GetGeometry()->GetIPtoCrystalSurface() ) ) ;
5f20d3fb	154	pphi *= kRADDEG ;
	155	TNode * top = gAlice->GetGeometry()->GetNode("alice") ;
	156
	157	char * nodename = new char[20] ;
	158	char * rotname = new char[20] ;
	159
fa7cce36	160	for( Int_t i = 1; i <= GetGeometry()->GetNModules(); i++ ) {
fa7cce36	161	Float_t angle = pphi * 2 * ( i - GetGeometry()->GetNModules() / 2.0 - 0.5 ) ;
5f20d3fb	162	sprintf(rotname, "%s%d", "rot", number++) ;
	163	new TRotMatrix(rotname, rotname, 90, angle, 90, 90 + angle, 0, 0);
	164	top->cd();
	165	sprintf(nodename,"%s%d", "Module", i) ;
	166	Float_t x = r * TMath::Sin( angle / kRADDEG ) ;
	167	Float_t y = -r * TMath::Cos( angle / kRADDEG ) ;
	168	TNode * bigboxnode = new TNode(nodename, nodename, "BigBox", x, y, 0, rotname ) ;
	169	bigboxnode->SetLineColor(kColorPHOS) ;
	170	fNodes->Add(bigboxnode) ;
	171	}
	172	delete[] nodename ;
	173	delete[] rotname ;
	174	}
	175
	176	//____________________________________________________________________________
	177	void AliPHOSv4::CreateGeometry()
	178	{
	179	// Create the geometry for GEANT
	180
29b077b5	181	AliPHOSv4 phostmp = dynamic_cast<AliPHOSv4>(gAlice->GetModule("PHOS")) ;
5f20d3fb	182
	183	if ( phostmp == NULL ) {
	184
	185	fprintf(stderr, "PHOS detector not found!\n") ;
	186	return ;
	187
	188	}
	189
	190	// Get pointer to the array containing media indeces
	191	Int_t *idtmed = fIdtmed->GetArray() - 699 ;
	192
	193	Float_t bigbox[3] ;
	194	bigbox[0] = GetBigBox(0) / 2.0 ;
	195	bigbox[1] = GetBigBox(1) / 2.0 ;
	196	bigbox[2] = GetBigBox(2) / 2.0 ;
	197
	198	gMC->Gsvolu("PHOS", "BOX ", idtmed[798], bigbox, 3) ;
	199
	200	// --- Position PHOS mdules in ALICE setup ---
	201
	202	Int_t idrotm[99] ;
	203	Double_t const kRADDEG = 180.0 / kPI ;
	204
fa7cce36	205	for( Int_t i = 1; i <= GetGeometry()->GetNModules(); i++ ) {
5f20d3fb	206
fa7cce36	207	Float_t angle = GetGeometry()->GetPHOSAngle(i) ;
5f20d3fb	208	AliMatrix(idrotm[i-1], 90.0, angle, 90.0, 90.0+angle, 0.0, 0.0) ;
5f20d3fb	209
fa7cce36	210	Float_t r = GetGeometry()->GetIPtoCrystalSurface() + GetBigBox(1) / 2.0 ;
5f20d3fb	211
	212	Float_t xP1 = r * TMath::Sin( angle / kRADDEG ) ;
	213	Float_t yP1 = -r * TMath::Cos( angle / kRADDEG ) ;
	214	gMC->Gspos("PHOS", i, "ALIC", xP1, yP1, 0.0, idrotm[i-1], "ONLY") ;
	215
	216	} // for GetNModules
	217
	218	}
	219
	220
	221	//____________________________________________________________________________
	222	void AliPHOSv4::Init(void)
	223	{
	224	// Prints out an information message
	225
	226	Int_t i;
	227
	228	printf("\n");
	229	for(i=0;i<35;i++) printf("*");
	230	printf(" FAST PHOS_INIT ");
	231	for(i=0;i<35;i++) printf("*");
	232	printf("\n");
	233
	234	// Here the PHOS initialisation code (if any!)
	235
	236	for(i=0;i<80;i++) printf("*");
	237	printf("\n");
	238
	239	}
	240
	241	//___________________________________________________________________________
baef0810	242	Float_t AliPHOSv4::GetBigBox(Int_t index) const
5f20d3fb	243	{
	244	// Get the X, Y or Z dimension of the box describing a PHOS module
	245
	246	Float_t rv = 0 ;
	247
	248	switch (index) {
	249	case 0:
	250	rv = fBigBoxX ;
	251	break ;
	252	case 1:
	253	rv = fBigBoxY ;
	254	break ;
	255	case 2:
	256	rv = fBigBoxZ ;
	257	break ;
	258	}
	259	return rv ;
	260	}
	261
	262	//___________________________________________________________________________
9e1a0ddb	263	void AliPHOSv4::MakeBranch(Option_t* opt, const char *file)
5f20d3fb	264	{
	265	// Create new branch in the current reconstructed Root Tree
	266
2ab0c725	267	AliDetector::MakeBranch(opt,file) ;
5f20d3fb	268
	269	char branchname[10];
	270	sprintf(branchname,"%s",GetName());
5cf7bbad	271	const char *cd = strstr(opt,"R");
5f20d3fb	272
5f20d3fb	273	if (fFastRecParticles && gAlice->TreeR() && cd) {
9e1a0ddb	274	MakeBranchInTree(gAlice->TreeR(),
9e1a0ddb	275	branchname, &fFastRecParticles, fBufferSize, file);
5f20d3fb	276	}
	277	}
	278
	279	//____________________________________________________________________________
	280	Double_t AliPHOSv4::MakeEnergy(const Double_t energy)
	281	{
	282	// Smears the energy according to the energy dependent energy resolution.
	283	// A gaussian distribution is assumed
	284
	285	Double_t sigma = SigmaE(energy) ;
	286	return fRan.Gaus(energy, sigma) ;
	287	}
	288
	289	//____________________________________________________________________________
	290	TVector3 AliPHOSv4::MakePosition(const Double_t energy, const TVector3 pos, const Double_t theta, const Double_t phi)
	291	{
	292	// Smears the impact position according to the energy dependent position resolution
	293	// A gaussian position distribution is assumed
	294
	295	TVector3 newpos ;
	296	Double_t sigma = SigmaP( energy, theta*180./TMath::Pi() ) ;
	297	Double_t x = fRan.Gaus( pos.X(), sigma ) ;
	298	sigma = SigmaP( energy, phi*180./TMath::Pi() ) ;
	299	Double_t z = fRan.Gaus( pos.Z(), sigma ) ;
	300	Double_t y = pos.Y() ;
	301
	302	newpos.SetX(x) ;
	303	newpos.SetY(y) ;
	304	newpos.SetZ(z) ;
	305
	306	return newpos ;
	307	}
	308
	309	//____________________________________________________________________________
	310	void AliPHOSv4::MakeRecParticle(const Int_t modid, const TVector3 pos, AliPHOSFastRecParticle & rp)
	311	{
	312	// Modify the primary particle properties according
	313	// 1. the response function of PHOS
	314	// 2. the performance of the EMC+PPSD setup
	315
	316	Int_t type = MakeType( rp ) ;
	317	rp.SetType(type) ;
	318
	319
	320	// get the detected energy
	321
	322	TLorentzVector momentum ;
	323	rp.Momentum(momentum) ;
	324	Double_t kineticenergy = TMath::Sqrt( TMath::Power(momentum.E(), 2) - TMath::Power(rp.GetMass(), 2) ) ;
	325	Double_t modifiedkineticenergy = MakeEnergy(kineticenergy ) ;
	326	Double_t modifiedenergy = TMath::Sqrt( TMath::Power(modifiedkineticenergy, 2)
	327	+ TMath::Power( rp.GetMass(), 2) ) ;
	328
	329	// get the angle of incidence
	330
	331	Double_t incidencetheta = 90. * TMath::Pi() /180 - rp.Theta() ;
fa7cce36	332	Double_t incidencephi = ( 270 + GetGeometry()->GetPHOSAngle(modid) ) * TMath::Pi() / 180. - rp.Phi() ;
5f20d3fb	333
	334	// get the detected direction
	335
	336	TVector3 modifiedposition = MakePosition(kineticenergy, pos, incidencetheta, incidencephi) ;
	337	modifiedposition *= modifiedkineticenergy / modifiedposition.Mag() ;
	338
	339	// Set the modified 4-momentum of the reconstructed particle
	340
	341	rp.SetMomentum(modifiedposition.X(), modifiedposition.Y(), modifiedposition.Z(), modifiedenergy) ;
	342
	343	}
	344
	345	//____________________________________________________________________________
	346	Int_t AliPHOSv4::MakeType(AliPHOSFastRecParticle & rp )
	347	{
	348	// Generate a particle type using the performance of the EMC+PPSD setup
	349
	350	Int_t rv = AliPHOSFastRecParticle::kUNDEFINED ;
	351	Int_t charge = (Int_t)rp.GetPDG()->Charge() ;
	352	Int_t test ;
	353	Float_t ran ;
	354	if ( charge != 0 && ( TMath::Abs(rp.GetPdgCode()) != 11 ) )
	355	test = - 1 ;
	356	else
	357	test = rp.GetPdgCode() ;
	358
	359	switch (test) {
	360
	361	case 22: // it's a photon
	362	ran = fRan.Rndm() ;
	363	if ( ran <= 0.5 ) // 50 %
	364	rv = AliPHOSFastRecParticle::kGAMMA ;
	365	else {
	366	ran = fRan.Rndm() ;
	367	if( ran <= 0.9498 )
	368	rv = AliPHOSFastRecParticle::kNEUTRALEM ;
	369	else
	370	rv = AliPHOSFastRecParticle::kNEUTRALHA ;
	371	}
	372	break ;
	373
	374	case 2112: // it's a neutron
	375	ran = fRan.Rndm() ;
	376	if ( ran <= 0.9998 )
	377	rv = AliPHOSFastRecParticle::kNEUTRALHA ;
	378	else
	379	rv = AliPHOSFastRecParticle::kNEUTRALEM ;
	380	break ;
	381
	382	case -2112: // it's a anti-neutron
	383	ran = fRan.Rndm() ;
	384	if ( ran <= 0.9984 )
	385	rv = AliPHOSFastRecParticle::kNEUTRALHA ;
	386	else
	387	rv = AliPHOSFastRecParticle::kNEUTRALEM ;
	388	break ;
	389
	390	case 11: // it's a electron
	391	ran = fRan.Rndm() ;
	392	if ( ran <= 0.9996 )
	393	rv = AliPHOSFastRecParticle::kELECTRON ;
	394	else
	395	rv = AliPHOSFastRecParticle::kCHARGEDHA ;
	396	break;
397
398	case -11: // it's a positon
399	ran = fRan.Rndm() ;
400	if ( ran <= 0.9996 )
401	rv = AliPHOSFastRecParticle::kELECTRON ;
402	else
403	rv = AliPHOSFastRecParticle::kCHARGEDHA ;
404	break;
405
406	case -1: // it's a charged
407	ran = fRan.Rndm() ;
408	if ( ran <= 0.9996 )
409	rv = AliPHOSFastRecParticle::kCHARGEDHA ;
410	else
411	rv = AliPHOSFastRecParticle::kGAMMA ;
412
413	break ;
414	}
415
416
417	return rv ;
418	}
419
420	//___________________________________________________________________________
421	void AliPHOSv4::ResetPoints()
422	{
423	// This overloads the method in AliDetector
424
425	ResetFastRecParticles() ;
426	}
427
428	//___________________________________________________________________________
429	void AliPHOSv4::ResetFastRecParticles()
430	{
431	// Resets the list of virtual reconstructed particles
432
433	if (fFastRecParticles)
434	fFastRecParticles->Clear() ;
435	fNRecParticles = 0 ;
436	}
437
438	//___________________________________________________________________________
439	void AliPHOSv4::SetBigBox(Int_t index, Float_t value)
440	{
441	// Set the size of the Box describing a PHOS module
442
443	switch (index) {
444	case 0:
445	fBigBoxX = value ;
446	break ;
447	case 1:
448	fBigBoxY = value ;
449	break ;
450	case 2:
451	fBigBoxZ = value ;
452	break ;
453	}
454
455	}
456
457	//____________________________________________________________________________
458	Double_t AliPHOSv4::SigmaE(Double_t energy)
459	{
460	// Calculates the energy dependent energy resolution
461
462	Double_t rv = -1 ;
463
464	rv = TMath::Sqrt( TMath::Power(fResPara1/energy, 2)
465	+ TMath::Power(fResPara2/TMath::Sqrt(energy), 2)
466	+ TMath::Power(fResPara3, 2) ) ;
467
468	return rv * energy ;
469	}
470
471	//____________________________________________________________________________
9d496c8c	472	Double_t AliPHOSv4::SigmaP(Double_t energy, Double_t incidence)
5f20d3fb	473	{
	474	// Calculates the energy dependent position resolution
	475
	476	Double_t paraA = fPosParaA0 + fPosParaA1 * incidence ;
	477	Double_t paraB = fPosParaB0 + fPosParaB1 * incidence + fPosParaB2 * incidence * incidence ;
	478
	479	return ( paraA / TMath::Sqrt(energy) + paraB ) * 0.1 ; // in cm
	480	}
	481
	482	//____________________________________________________________________________
	483	void AliPHOSv4::StepManager(void)
	484	{
	485	// Only verifies if the particle reaches PHOS and stops the tracking
5cbba5aa	486
5f20d3fb	487	Int_t primary = gAlice->GetPrimary( gAlice->CurrentTrack() );
5cbba5aa	488
5f20d3fb	489	TLorentzVector lv ;
	490	gMC->TrackPosition(lv) ;
	491	TVector3 pos = lv.Vect() ;
	492	Int_t modid ;
	493	gMC->CurrentVolID(modid);
	494
2f04ed65	495	Float_t energy = gMC->Etot() ; //Total energy of current track
5cbba5aa	496
5cbba5aa	497	//Calculating mass of current particle
2f04ed65	498	TDatabasePDG * pdg = TDatabasePDG::Instance() ;
2f04ed65	499	TParticlePDG * partPDG = pdg->GetParticle(gMC->TrackPid()) ;
5cbba5aa	500	Float_t mass = partPDG->Mass() ;
5f20d3fb	501
2f04ed65	502	if(energy > mass){
	503	pos.SetMag(TMath::Sqrt(energyenergy-massmass)) ;
	504	TLorentzVector pTrack(pos, energy) ;
5cbba5aa	505
	506	TParticle * part = new TParticle(gMC->TrackPid(), 0,-1,-1,-1,-1, pTrack, lv) ;
	507
	508	AliPHOSFastRecParticle rp(*part) ;
	509	rp.SetPrimary(primary) ;
	510
	511	// Adds the response of PHOS to the particle
	512	MakeRecParticle(modid, pos, rp) ;
	513
	514	// add the `track' particle to the FastRecParticles list
5f20d3fb	515
5cbba5aa	516	AddRecParticle(rp) ;
5f20d3fb	517
5cbba5aa	518	part->Delete() ;
5cbba5aa	519	}
5f20d3fb	520	// stop the track as soon PHOS is reached
	521
	522	gMC->StopTrack() ;
	523
	524	}
	525