[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"

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