[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 ---

#include <stdio.h>

// --- 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
	38	#include <stdio.h>
	39
	40	// --- AliRoot header files ---
cede8016	41	#include "AliPHOSFastRecParticle.h"
cede8016	42	#include "AliPHOSGeometry.h"
5f20d3fb	43	#include "AliPHOSv4.h"
7b7c1533	44	#include "AliPHOSGetter.h"
5f20d3fb	45	#include "AliRun.h"
5f20d3fb	46	#include "AliConst.h"
94de3818	47	#include "AliMC.h"
5f20d3fb	48
	49	ClassImp(AliPHOSv4)
	50
735e58f1	51	//____________________________________________________________________________
33faac69	52	AliPHOSv4::AliPHOSv4() : AliPHOS()
735e58f1	53	{
	54	// default ctor : initialize data member
	55	fBigBoxX = 0. ;
	56	fBigBoxY = 0. ;
	57	fBigBoxZ = 0. ;
	58	fFastRecParticles = 0 ;
	59	fNRecParticles = 0 ;
	60	fRan = 0 ;
	61	fResPara1 = 0. ;
	62	fResPara2 = 0. ;
	63	fResPara3 = 0. ;
	64	fPosParaA0 = 0. ;
	65	fPosParaA1 = 0. ;
	66	fPosParaB0 = 0. ;
	67	fPosParaB1 = 0. ;
	68	fPosParaB2 = 0. ;
	69
	70	}
	71
5f20d3fb	72	//____________________________________________________________________________
	73	AliPHOSv4::AliPHOSv4(const char name, const char title):
	74	AliPHOS(name,title)
	75	{
	76	// ctor
	77
7b7c1533	78
	79	// create the geometry parameters object
	80	// and post it to a folder (Post retrieves the correct geometry)
c4864d2c	81	AliPHOSGetter::GetInstance(gDirectory->GetName(), 0)->PostGeometry() ;
aafe457d	82
fa7cce36	83	SetBigBox(0, GetGeometry()->GetOuterBoxSize(0) ) ;
	84	SetBigBox(1, GetGeometry()->GetOuterBoxSize(1) + GetGeometry()->GetCPVBoxSize(1) ) ;
	85	SetBigBox(2, GetGeometry()->GetOuterBoxSize(0) );
aafe457d	86
	87	fNRecParticles = 0 ;
	88	fFastRecParticles = new AliPHOSFastRecParticle::FastRecParticlesList("AliPHOSFastRecParticle", 100) ;
5cbba5aa	89
aafe457d	90	fResPara1 = 0.030 ; // GeV
	91	fResPara2 = 0.00003 ;
	92	fResPara3 = 0.00001 ;
	93
	94	fPosParaA0 = 2.87 ; // mm
	95	fPosParaA1 = -0.0975 ;
	96	fPosParaB0 = 0.257 ;
	97	fPosParaB1 = 0.137 ;
	98	fPosParaB2 = 0.00619 ;
5f20d3fb	99	}
	100
	101	//____________________________________________________________________________
	102	AliPHOSv4::~AliPHOSv4()
	103	{
	104	// dtor
	105
	106	fFastRecParticles->Delete() ;
	107	delete fFastRecParticles ;
	108	fFastRecParticles = 0 ;
	109
	110	}
	111
	112	//____________________________________________________________________________
	113	void AliPHOSv4::AddRecParticle(const AliPHOSFastRecParticle & rp)
	114	{
	115	// Add a virtually reconstructed particle to the list
	116
	117	new( (*fFastRecParticles)[fNRecParticles] ) AliPHOSFastRecParticle(rp) ;
	118	fNRecParticles++ ;
	119	}
	120
	121	//____________________________________________________________________________
	122	void AliPHOSv4::BuildGeometry()
	123	{
	124	// Build the PHOS geometry for the ROOT display
	125	//BEGIN_HTML
	126	/*
	127	<H2>
	128	PHOS FAST in ALICE displayed by root
	129	</H2>
	130	<H4> All Views </H4>
	131	<P>
	132	<CENTER>
	133	<IMG Align=BOTTOM ALT="Fast All Views" SRC="../images/AliPHOSv4AllViews.gif">
	134	</CENTER></P>
	135	<H4> Front View </H4>
	136	<P>
	137	<CENTER>
	138	<IMG Align=BOTTOM ALT="Fast Front View" SRC="../images/AliPHOSv4FrontView.gif">
	139	</CENTER></P>
	140	*/
	141	//END_HTML
	142
	143	const Int_t kColorPHOS = kRed ;
	144
	145	Double_t const kRADDEG = 180.0 / kPI ;
	146
	147	new TBRIK( "BigBox", "PHOS box", "void", GetBigBox(0)/2,
	148	GetBigBox(1)/2,
	149	GetBigBox(2)/2 );
	150
	151	// position PHOS into ALICE
	152
fa7cce36	153	Float_t r = GetGeometry()->GetIPtoCrystalSurface() + GetBigBox(1) / 2.0 ;
5f20d3fb	154	Int_t number = 988 ;
fa7cce36	155	Float_t pphi = TMath::ATan( GetBigBox(0) / ( 2.0 * GetGeometry()->GetIPtoCrystalSurface() ) ) ;
5f20d3fb	156	pphi *= kRADDEG ;
	157	TNode * top = gAlice->GetGeometry()->GetNode("alice") ;
	158
	159	char * nodename = new char[20] ;
	160	char * rotname = new char[20] ;
	161
fa7cce36	162	for( Int_t i = 1; i <= GetGeometry()->GetNModules(); i++ ) {
fa7cce36	163	Float_t angle = pphi * 2 * ( i - GetGeometry()->GetNModules() / 2.0 - 0.5 ) ;
5f20d3fb	164	sprintf(rotname, "%s%d", "rot", number++) ;
	165	new TRotMatrix(rotname, rotname, 90, angle, 90, 90 + angle, 0, 0);
	166	top->cd();
	167	sprintf(nodename,"%s%d", "Module", i) ;
	168	Float_t x = r * TMath::Sin( angle / kRADDEG ) ;
	169	Float_t y = -r * TMath::Cos( angle / kRADDEG ) ;
	170	TNode * bigboxnode = new TNode(nodename, nodename, "BigBox", x, y, 0, rotname ) ;
	171	bigboxnode->SetLineColor(kColorPHOS) ;
	172	fNodes->Add(bigboxnode) ;
	173	}
	174	delete[] nodename ;
	175	delete[] rotname ;
	176	}
	177
	178	//____________________________________________________________________________
	179	void AliPHOSv4::CreateGeometry()
	180	{
	181	// Create the geometry for GEANT
	182
29b077b5	183	AliPHOSv4 phostmp = dynamic_cast<AliPHOSv4>(gAlice->GetModule("PHOS")) ;
5f20d3fb	184
	185	if ( phostmp == NULL ) {
	186
	187	fprintf(stderr, "PHOS detector not found!\n") ;
	188	return ;
	189
	190	}
	191
	192	// Get pointer to the array containing media indeces
	193	Int_t *idtmed = fIdtmed->GetArray() - 699 ;
	194
	195	Float_t bigbox[3] ;
	196	bigbox[0] = GetBigBox(0) / 2.0 ;
	197	bigbox[1] = GetBigBox(1) / 2.0 ;
	198	bigbox[2] = GetBigBox(2) / 2.0 ;
	199
	200	gMC->Gsvolu("PHOS", "BOX ", idtmed[798], bigbox, 3) ;
	201
	202	// --- Position PHOS mdules in ALICE setup ---
	203
	204	Int_t idrotm[99] ;
	205	Double_t const kRADDEG = 180.0 / kPI ;
	206
fa7cce36	207	for( Int_t i = 1; i <= GetGeometry()->GetNModules(); i++ ) {
5f20d3fb	208
fa7cce36	209	Float_t angle = GetGeometry()->GetPHOSAngle(i) ;
5f20d3fb	210	AliMatrix(idrotm[i-1], 90.0, angle, 90.0, 90.0+angle, 0.0, 0.0) ;
5f20d3fb	211
fa7cce36	212	Float_t r = GetGeometry()->GetIPtoCrystalSurface() + GetBigBox(1) / 2.0 ;
5f20d3fb	213
	214	Float_t xP1 = r * TMath::Sin( angle / kRADDEG ) ;
	215	Float_t yP1 = -r * TMath::Cos( angle / kRADDEG ) ;
	216	gMC->Gspos("PHOS", i, "ALIC", xP1, yP1, 0.0, idrotm[i-1], "ONLY") ;
	217
	218	} // for GetNModules
	219
	220	}
	221
	222
	223	//____________________________________________________________________________
	224	void AliPHOSv4::Init(void)
	225	{
	226	// Prints out an information message
	227
	228	Int_t i;
	229
	230	printf("\n");
	231	for(i=0;i<35;i++) printf("*");
	232	printf(" FAST PHOS_INIT ");
	233	for(i=0;i<35;i++) printf("*");
	234	printf("\n");
	235
	236	// Here the PHOS initialisation code (if any!)
	237
	238	for(i=0;i<80;i++) printf("*");
	239	printf("\n");
	240
	241	}
	242
	243	//___________________________________________________________________________
baef0810	244	Float_t AliPHOSv4::GetBigBox(Int_t index) const
5f20d3fb	245	{
	246	// Get the X, Y or Z dimension of the box describing a PHOS module
	247
	248	Float_t rv = 0 ;
	249
	250	switch (index) {
	251	case 0:
	252	rv = fBigBoxX ;
	253	break ;
	254	case 1:
	255	rv = fBigBoxY ;
	256	break ;
	257	case 2:
	258	rv = fBigBoxZ ;
	259	break ;
	260	}
	261	return rv ;
	262	}
	263
	264	//___________________________________________________________________________
9e1a0ddb	265	void AliPHOSv4::MakeBranch(Option_t* opt, const char *file)
5f20d3fb	266	{
	267	// Create new branch in the current reconstructed Root Tree
	268
2ab0c725	269	AliDetector::MakeBranch(opt,file) ;
5f20d3fb	270
	271	char branchname[10];
	272	sprintf(branchname,"%s",GetName());
5cf7bbad	273	const char *cd = strstr(opt,"R");
5f20d3fb	274
5f20d3fb	275	if (fFastRecParticles && gAlice->TreeR() && cd) {
9e1a0ddb	276	MakeBranchInTree(gAlice->TreeR(),
9e1a0ddb	277	branchname, &fFastRecParticles, fBufferSize, file);
5f20d3fb	278	}
	279	}
	280
	281	//____________________________________________________________________________
	282	Double_t AliPHOSv4::MakeEnergy(const Double_t energy)
	283	{
	284	// Smears the energy according to the energy dependent energy resolution.
	285	// A gaussian distribution is assumed
	286
	287	Double_t sigma = SigmaE(energy) ;
	288	return fRan.Gaus(energy, sigma) ;
	289	}
	290
	291	//____________________________________________________________________________
	292	TVector3 AliPHOSv4::MakePosition(const Double_t energy, const TVector3 pos, const Double_t theta, const Double_t phi)
	293	{
	294	// Smears the impact position according to the energy dependent position resolution
	295	// A gaussian position distribution is assumed
	296
	297	TVector3 newpos ;
	298	Double_t sigma = SigmaP( energy, theta*180./TMath::Pi() ) ;
	299	Double_t x = fRan.Gaus( pos.X(), sigma ) ;
	300	sigma = SigmaP( energy, phi*180./TMath::Pi() ) ;
	301	Double_t z = fRan.Gaus( pos.Z(), sigma ) ;
	302	Double_t y = pos.Y() ;
	303
	304	newpos.SetX(x) ;
	305	newpos.SetY(y) ;
	306	newpos.SetZ(z) ;
	307
	308	return newpos ;
	309	}
	310
	311	//____________________________________________________________________________
	312	void AliPHOSv4::MakeRecParticle(const Int_t modid, const TVector3 pos, AliPHOSFastRecParticle & rp)
	313	{
	314	// Modify the primary particle properties according
	315	// 1. the response function of PHOS
	316	// 2. the performance of the EMC+PPSD setup
	317
	318	Int_t type = MakeType( rp ) ;
	319	rp.SetType(type) ;
	320
	321
	322	// get the detected energy
	323
	324	TLorentzVector momentum ;
	325	rp.Momentum(momentum) ;
	326	Double_t kineticenergy = TMath::Sqrt( TMath::Power(momentum.E(), 2) - TMath::Power(rp.GetMass(), 2) ) ;
	327	Double_t modifiedkineticenergy = MakeEnergy(kineticenergy ) ;
	328	Double_t modifiedenergy = TMath::Sqrt( TMath::Power(modifiedkineticenergy, 2)
	329	+ TMath::Power( rp.GetMass(), 2) ) ;
	330
	331	// get the angle of incidence
	332
	333	Double_t incidencetheta = 90. * TMath::Pi() /180 - rp.Theta() ;
fa7cce36	334	Double_t incidencephi = ( 270 + GetGeometry()->GetPHOSAngle(modid) ) * TMath::Pi() / 180. - rp.Phi() ;
5f20d3fb	335
	336	// get the detected direction
	337
	338	TVector3 modifiedposition = MakePosition(kineticenergy, pos, incidencetheta, incidencephi) ;
	339	modifiedposition *= modifiedkineticenergy / modifiedposition.Mag() ;
	340
	341	// Set the modified 4-momentum of the reconstructed particle
	342
	343	rp.SetMomentum(modifiedposition.X(), modifiedposition.Y(), modifiedposition.Z(), modifiedenergy) ;
	344
	345	}
	346
	347	//____________________________________________________________________________
	348	Int_t AliPHOSv4::MakeType(AliPHOSFastRecParticle & rp )
	349	{
	350	// Generate a particle type using the performance of the EMC+PPSD setup
	351
	352	Int_t rv = AliPHOSFastRecParticle::kUNDEFINED ;
	353	Int_t charge = (Int_t)rp.GetPDG()->Charge() ;
	354	Int_t test ;
	355	Float_t ran ;
	356	if ( charge != 0 && ( TMath::Abs(rp.GetPdgCode()) != 11 ) )
	357	test = - 1 ;
	358	else
	359	test = rp.GetPdgCode() ;
	360
	361	switch (test) {
	362
	363	case 22: // it's a photon
	364	ran = fRan.Rndm() ;
	365	if ( ran <= 0.5 ) // 50 %
	366	rv = AliPHOSFastRecParticle::kGAMMA ;
	367	else {
	368	ran = fRan.Rndm() ;
	369	if( ran <= 0.9498 )
	370	rv = AliPHOSFastRecParticle::kNEUTRALEM ;
	371	else
	372	rv = AliPHOSFastRecParticle::kNEUTRALHA ;
	373	}
	374	break ;
	375
	376	case 2112: // it's a neutron
	377	ran = fRan.Rndm() ;
	378	if ( ran <= 0.9998 )
	379	rv = AliPHOSFastRecParticle::kNEUTRALHA ;
	380	else
	381	rv = AliPHOSFastRecParticle::kNEUTRALEM ;
	382	break ;
	383
	384	case -2112: // it's a anti-neutron
	385	ran = fRan.Rndm() ;
	386	if ( ran <= 0.9984 )
	387	rv = AliPHOSFastRecParticle::kNEUTRALHA ;
	388	else
	389	rv = AliPHOSFastRecParticle::kNEUTRALEM ;
	390	break ;
	391
	392	case 11: // it's a electron
	393	ran = fRan.Rndm() ;
	394	if ( ran <= 0.9996 )
	395	rv = AliPHOSFastRecParticle::kELECTRON ;
	396	else
	397	rv = AliPHOSFastRecParticle::kCHARGEDHA ;
	398	break;
399
400	case -11: // it's a positon
401	ran = fRan.Rndm() ;
402	if ( ran <= 0.9996 )
403	rv = AliPHOSFastRecParticle::kELECTRON ;
404	else
405	rv = AliPHOSFastRecParticle::kCHARGEDHA ;
406	break;
407
408	case -1: // it's a charged
409	ran = fRan.Rndm() ;
410	if ( ran <= 0.9996 )
411	rv = AliPHOSFastRecParticle::kCHARGEDHA ;
412	else
413	rv = AliPHOSFastRecParticle::kGAMMA ;
414
415	break ;
416	}
417
418
419	return rv ;
420	}
421
422	//___________________________________________________________________________
423	void AliPHOSv4::ResetPoints()
424	{
425	// This overloads the method in AliDetector
426
427	ResetFastRecParticles() ;
428	}
429
430	//___________________________________________________________________________
431	void AliPHOSv4::ResetFastRecParticles()
432	{
433	// Resets the list of virtual reconstructed particles
434
435	if (fFastRecParticles)
436	fFastRecParticles->Clear() ;
437	fNRecParticles = 0 ;
438	}
439
440	//___________________________________________________________________________
441	void AliPHOSv4::SetBigBox(Int_t index, Float_t value)
442	{
443	// Set the size of the Box describing a PHOS module
444
445	switch (index) {
446	case 0:
447	fBigBoxX = value ;
448	break ;
449	case 1:
450	fBigBoxY = value ;
451	break ;
452	case 2:
453	fBigBoxZ = value ;
454	break ;
455	}
456
457	}
458
459	//____________________________________________________________________________
460	Double_t AliPHOSv4::SigmaE(Double_t energy)
461	{
462	// Calculates the energy dependent energy resolution
463
464	Double_t rv = -1 ;
465
466	rv = TMath::Sqrt( TMath::Power(fResPara1/energy, 2)
467	+ TMath::Power(fResPara2/TMath::Sqrt(energy), 2)
468	+ TMath::Power(fResPara3, 2) ) ;
469
470	return rv * energy ;
471	}
472
473	//____________________________________________________________________________
9d496c8c	474	Double_t AliPHOSv4::SigmaP(Double_t energy, Double_t incidence)
5f20d3fb	475	{
	476	// Calculates the energy dependent position resolution
	477
	478	Double_t paraA = fPosParaA0 + fPosParaA1 * incidence ;
	479	Double_t paraB = fPosParaB0 + fPosParaB1 * incidence + fPosParaB2 * incidence * incidence ;
	480
	481	return ( paraA / TMath::Sqrt(energy) + paraB ) * 0.1 ; // in cm
	482	}
	483
	484	//____________________________________________________________________________
	485	void AliPHOSv4::StepManager(void)
	486	{
	487	// Only verifies if the particle reaches PHOS and stops the tracking
5cbba5aa	488
5f20d3fb	489	Int_t primary = gAlice->GetPrimary( gAlice->CurrentTrack() );
5cbba5aa	490
5f20d3fb	491	TLorentzVector lv ;
	492	gMC->TrackPosition(lv) ;
	493	TVector3 pos = lv.Vect() ;
	494	Int_t modid ;
	495	gMC->CurrentVolID(modid);
	496
2f04ed65	497	Float_t energy = gMC->Etot() ; //Total energy of current track
5cbba5aa	498
5cbba5aa	499	//Calculating mass of current particle
2f04ed65	500	TDatabasePDG * pdg = TDatabasePDG::Instance() ;
2f04ed65	501	TParticlePDG * partPDG = pdg->GetParticle(gMC->TrackPid()) ;
5cbba5aa	502	Float_t mass = partPDG->Mass() ;
5f20d3fb	503
2f04ed65	504	if(energy > mass){
	505	pos.SetMag(TMath::Sqrt(energyenergy-massmass)) ;
	506	TLorentzVector pTrack(pos, energy) ;
5cbba5aa	507
	508	TParticle * part = new TParticle(gMC->TrackPid(), 0,-1,-1,-1,-1, pTrack, lv) ;
	509
	510	AliPHOSFastRecParticle rp(*part) ;
	511	rp.SetPrimary(primary) ;
	512
	513	// Adds the response of PHOS to the particle
	514	MakeRecParticle(modid, pos, rp) ;
	515
	516	// add the `track' particle to the FastRecParticles list
5f20d3fb	517
5cbba5aa	518	AddRecParticle(rp) ;
5f20d3fb	519
5cbba5aa	520	part->Delete() ;
5cbba5aa	521	}
5f20d3fb	522	// stop the track as soon PHOS is reached
	523
	524	gMC->StopTrack() ;
	525
	526	}
	527