[u/mrichter/AliRoot.git] / PHOS / AliPHOSvFast.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 "AliPHOSvFast.h"
#include "AliPHOSGetter.h"
#include "AliRun.h"
#include "AliConst.h"

ClassImp(AliPHOSvFast)

//____________________________________________________________________________
AliPHOSvFast::AliPHOSvFast() : 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. ;    

}

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

  
  // create the Getter 
  AliPHOSGetter::GetInstance(gDirectory->GetName(), 0) ; 
  
  SetBigBox(0, GetGeometry()->GetOuterBoxSize(0) ) ;
  SetBigBox(1, GetGeometry()->GetOuterBoxSize(3) + GetGeometry()->GetCPVBoxSize(1) ) ; 
  SetBigBox(2, GetGeometry()->GetOuterBoxSize(2) ); 
  
  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 ; 
}

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

}

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

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

//____________________________________________________________________________
void AliPHOSvFast::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/AliPHOSvFastAllViews.gif"> 
    </CENTER></P>
    <H4> Front View </H4>
    <P>
    <CENTER>
    <IMG Align=BOTTOM ALT="Fast Front View" SRC="../images/AliPHOSvFastFrontView.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 AliPHOSvFast::CreateGeometry()
{
  // Create the geometry for GEANT
  
  AliPHOSvFast *phostmp = (AliPHOSvFast*)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 AliPHOSvFast::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 AliPHOSvFast::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 AliPHOSvFast::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 AliPHOSvFast::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 AliPHOSvFast::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 AliPHOSvFast::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 AliPHOSvFast::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() ; 

  Info("MakeType", "SHOULD NOT BE USED until values of probabilities are properly set ") ;
  assert(1==0) ;    // NB: ALL VALUES SHOULD BE CHECKED !!!!
  switch (test) { 

  case 22:    // it's a photon              // NB: ALL VALUES SHOLD BE CHECKED !!!!
    ran = fRan.Rndm() ; 
    if( ran <= 0.9498 )
      rv =  AliPHOSFastRecParticle::kNEUTRALHAFAST ; 
    else
      rv =  AliPHOSFastRecParticle::kNEUTRALEMFAST ;     
    break ; 

  case 2112:  // it's a neutron
    ran = fRan.Rndm() ; 
    if ( ran <= 0.9998 )
      rv =  AliPHOSFastRecParticle::kNEUTRALHASLOW ; 
    else 
      rv = AliPHOSFastRecParticle::kNEUTRALEMSLOW ; 
    break ; 
    
  case -2112: // it's a anti-neutron
    ran = fRan.Rndm() ; 
    if ( ran <= 0.9984 )
      rv =  AliPHOSFastRecParticle::kNEUTRALHASLOW ; 
    else 
      rv =  AliPHOSFastRecParticle::kNEUTRALEMSLOW ; 
    break ; 
    
  case 11:    // it's a electron
    ran = fRan.Rndm() ; 
    if ( ran <= 0.9996 )
      rv =  AliPHOSFastRecParticle::kCHARGEDEMFAST ; 
    else 
      rv =  AliPHOSFastRecParticle::kCHARGEDHAFAST ; 
    break; 

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

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

    break ; 
  }
    
  
  return rv ;
}

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

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

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

  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) ;

    // 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
3decf5cb	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
b2a60966	16	/* $Id$ */
b2a60966	17
3decf5cb	18	//_________________________________________________________________________
b2a60966	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)
3decf5cb	26
3decf5cb	27	// --- ROOT system ---
3a4295ee	28
3decf5cb	29	#include "TBRIK.h"
	30	#include "TNode.h"
	31	#include "TParticle.h"
3a4295ee	32	#include "TTree.h"
	33	#include "TGeometry.h"
	34	#include "TFile.h"
3decf5cb	35
	36	// --- Standard library ---
	37
3decf5cb	38	// --- AliRoot header files ---
3a4295ee	39	#include "AliPHOSFastRecParticle.h"
3a4295ee	40	#include "AliPHOSGeometry.h"
3decf5cb	41	#include "AliPHOSvFast.h"
3a4295ee	42	#include "AliPHOSGetter.h"
3decf5cb	43	#include "AliRun.h"
	44	#include "AliConst.h"
	45
	46	ClassImp(AliPHOSvFast)
	47
	48	//____________________________________________________________________________
3a4295ee	49	AliPHOSvFast::AliPHOSvFast() : AliPHOS()
3decf5cb	50	{
3a4295ee	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. ;
b2a60966	66
3decf5cb	67	}
	68
	69	//____________________________________________________________________________
	70	AliPHOSvFast::AliPHOSvFast(const char name, const char title):
	71	AliPHOS(name,title)
	72	{
b2a60966	73	// ctor
b2a60966	74
3decf5cb	75
7a9d98f9	76	// create the Getter
	77	AliPHOSGetter::GetInstance(gDirectory->GetName(), 0) ;
	78
	79	SetBigBox(0, GetGeometry()->GetOuterBoxSize(0) ) ;
	80	SetBigBox(1, GetGeometry()->GetOuterBoxSize(3) + GetGeometry()->GetCPVBoxSize(1) ) ;
	81	SetBigBox(2, GetGeometry()->GetOuterBoxSize(2) );
	82
	83	fNRecParticles = 0 ;
	84	fFastRecParticles = new AliPHOSFastRecParticle::FastRecParticlesList("AliPHOSFastRecParticle", 100) ;
	85
	86	fResPara1 = 0.030 ; // GeV
	87	fResPara2 = 0.00003 ;
	88	fResPara3 = 0.00001 ;
	89
	90	fPosParaA0 = 2.87 ; // mm
	91	fPosParaA1 = -0.0975 ;
	92	fPosParaB0 = 0.257 ;
	93	fPosParaB1 = 0.137 ;
	94	fPosParaB2 = 0.00619 ;
3decf5cb	95	}
	96
	97	//____________________________________________________________________________
	98	AliPHOSvFast::~AliPHOSvFast()
	99	{
b2a60966	100	// dtor
3decf5cb	101
a73f33f0	102	fFastRecParticles->Delete() ;
	103	delete fFastRecParticles ;
	104	fFastRecParticles = 0 ;
3decf5cb	105
	106	}
	107
	108	//____________________________________________________________________________
a73f33f0	109	void AliPHOSvFast::AddRecParticle(const AliPHOSFastRecParticle & rp)
a73f33f0	110	{
b2a60966	111	// Add a virtually reconstructed particle to the list
b2a60966	112
f96d3dc7	113	new( (*fFastRecParticles)[fNRecParticles] ) AliPHOSFastRecParticle(rp) ;
f96d3dc7	114	fNRecParticles++ ;
3decf5cb	115	}
	116
	117	//____________________________________________________________________________
	118	void AliPHOSvFast::BuildGeometry()
	119	{
3decf5cb	120	// Build the PHOS geometry for the ROOT display
b2a60966	121	//BEGIN_HTML
	122	/*
	123	<H2>
	124	PHOS FAST in ALICE displayed by root
	125	</H2>
	126	<H4> All Views </H4>
	127	<P>
	128	<CENTER>
	129	<IMG Align=BOTTOM ALT="Fast All Views" SRC="../images/AliPHOSvFastAllViews.gif">
	130	</CENTER></P>
	131	<H4> Front View </H4>
	132	<P>
	133	<CENTER>
	134	<IMG Align=BOTTOM ALT="Fast Front View" SRC="../images/AliPHOSvFastFrontView.gif">
	135	</CENTER></P>
	136	*/
	137	//END_HTML
	138
3decf5cb	139	const Int_t kColorPHOS = kRed ;
	140
	141	Double_t const kRADDEG = 180.0 / kPI ;
	142
	143	new TBRIK( "BigBox", "PHOS box", "void", GetBigBox(0)/2,
	144	GetBigBox(1)/2,
	145	GetBigBox(2)/2 );
	146
	147	// position PHOS into ALICE
	148
fa7cce36	149	Float_t r = GetGeometry()->GetIPtoCrystalSurface() + GetBigBox(1) / 2.0 ;
3decf5cb	150	Int_t number = 988 ;
fa7cce36	151	Float_t pphi = TMath::ATan( GetBigBox(0) / ( 2.0 * GetGeometry()->GetIPtoCrystalSurface() ) ) ;
3decf5cb	152	pphi *= kRADDEG ;
	153	TNode * top = gAlice->GetGeometry()->GetNode("alice") ;
	154
	155	char * nodename = new char[20] ;
	156	char * rotname = new char[20] ;
	157
fa7cce36	158	for( Int_t i = 1; i <= GetGeometry()->GetNModules(); i++ ) {
fa7cce36	159	Float_t angle = pphi * 2 * ( i - GetGeometry()->GetNModules() / 2.0 - 0.5 ) ;
3decf5cb	160	sprintf(rotname, "%s%d", "rot", number++) ;
	161	new TRotMatrix(rotname, rotname, 90, angle, 90, 90 + angle, 0, 0);
	162	top->cd();
	163	sprintf(nodename,"%s%d", "Module", i) ;
	164	Float_t x = r * TMath::Sin( angle / kRADDEG ) ;
	165	Float_t y = -r * TMath::Cos( angle / kRADDEG ) ;
	166	TNode * bigboxnode = new TNode(nodename, nodename, "BigBox", x, y, 0, rotname ) ;
	167	bigboxnode->SetLineColor(kColorPHOS) ;
	168	fNodes->Add(bigboxnode) ;
	169	}
	170	delete[] nodename ;
	171	delete[] rotname ;
	172	}
	173
	174	//____________________________________________________________________________
	175	void AliPHOSvFast::CreateGeometry()
	176	{
b2a60966	177	// Create the geometry for GEANT
b2a60966	178
3decf5cb	179	AliPHOSvFast phostmp = (AliPHOSvFast)gAlice->GetModule("PHOS") ;
b2a60966	180
3decf5cb	181	if ( phostmp == NULL ) {
	182
	183	fprintf(stderr, "PHOS detector not found!\n") ;
	184	return ;
	185
	186	}
	187
	188	// Get pointer to the array containing media indeces
	189	Int_t *idtmed = fIdtmed->GetArray() - 699 ;
	190
	191	Float_t bigbox[3] ;
	192	bigbox[0] = GetBigBox(0) / 2.0 ;
	193	bigbox[1] = GetBigBox(1) / 2.0 ;
	194	bigbox[2] = GetBigBox(2) / 2.0 ;
	195
	196	gMC->Gsvolu("PHOS", "BOX ", idtmed[798], bigbox, 3) ;
	197
	198	// --- Position PHOS mdules in ALICE setup ---
	199
	200	Int_t idrotm[99] ;
	201	Double_t const kRADDEG = 180.0 / kPI ;
	202
fa7cce36	203	for( Int_t i = 1; i <= GetGeometry()->GetNModules(); i++ ) {
3decf5cb	204
fa7cce36	205	Float_t angle = GetGeometry()->GetPHOSAngle(i) ;
3decf5cb	206	AliMatrix(idrotm[i-1], 90.0, angle, 90.0, 90.0+angle, 0.0, 0.0) ;
3decf5cb	207
fa7cce36	208	Float_t r = GetGeometry()->GetIPtoCrystalSurface() + GetBigBox(1) / 2.0 ;
3decf5cb	209
	210	Float_t xP1 = r * TMath::Sin( angle / kRADDEG ) ;
	211	Float_t yP1 = -r * TMath::Cos( angle / kRADDEG ) ;
3decf5cb	212	gMC->Gspos("PHOS", i, "ALIC", xP1, yP1, 0.0, idrotm[i-1], "ONLY") ;
	213
	214	} // for GetNModules
	215
	216	}
	217
	218
	219	//____________________________________________________________________________
	220	void AliPHOSvFast::Init(void)
	221	{
b2a60966	222	// Prints out an information message
b2a60966	223
3decf5cb	224	Int_t i;
	225
	226	printf("\n");
	227	for(i=0;i<35;i++) printf("*");
	228	printf(" FAST PHOS_INIT ");
	229	for(i=0;i<35;i++) printf("*");
	230	printf("\n");
	231
	232	// Here the PHOS initialisation code (if any!)
	233
	234	for(i=0;i<80;i++) printf("*");
	235	printf("\n");
	236
	237	}
	238
	239	//___________________________________________________________________________
3a4295ee	240	Float_t AliPHOSvFast::GetBigBox(Int_t index) const
3decf5cb	241	{
b2a60966	242	// Get the X, Y or Z dimension of the box describing a PHOS module
b2a60966	243
3decf5cb	244	Float_t rv = 0 ;
	245
	246	switch (index) {
	247	case 0:
	248	rv = fBigBoxX ;
	249	break ;
	250	case 1:
	251	rv = fBigBoxY ;
	252	break ;
	253	case 2:
	254	rv = fBigBoxZ ;
	255	break ;
	256	}
	257	return rv ;
	258	}
	259
	260	//___________________________________________________________________________
9e1a0ddb	261	void AliPHOSvFast::MakeBranch(Option_t* opt, const char *file)
3decf5cb	262	{
b2a60966	263	// Create new branch in the current reconstructed Root Tree
f96d3dc7	264
2ab0c725	265	AliDetector::MakeBranch(opt,file) ;
3decf5cb	266
	267	char branchname[10];
	268	sprintf(branchname,"%s",GetName());
3a4295ee	269	const char *cd = strstr(opt,"R");
3decf5cb	270
a73f33f0	271	if (fFastRecParticles && gAlice->TreeR() && cd) {
9e1a0ddb	272	MakeBranchInTree(gAlice->TreeR(),
9e1a0ddb	273	branchname, &fFastRecParticles, fBufferSize, file);
3decf5cb	274	}
	275	}
	276
a73f33f0	277	//____________________________________________________________________________
	278	Double_t AliPHOSvFast::MakeEnergy(const Double_t energy)
	279	{
b2a60966	280	// Smears the energy according to the energy dependent energy resolution.
	281	// A gaussian distribution is assumed
	282
b1aa729d	283	Double_t sigma = SigmaE(energy) ;
b1aa729d	284	return fRan.Gaus(energy, sigma) ;
a73f33f0	285	}
	286
	287	//____________________________________________________________________________
b1aa729d	288	TVector3 AliPHOSvFast::MakePosition(const Double_t energy, const TVector3 pos, const Double_t theta, const Double_t phi)
a73f33f0	289	{
b2a60966	290	// Smears the impact position according to the energy dependent position resolution
	291	// A gaussian position distribution is assumed
	292
b1aa729d	293	TVector3 newpos ;
	294	Double_t sigma = SigmaP( energy, theta*180./TMath::Pi() ) ;
	295	Double_t x = fRan.Gaus( pos.X(), sigma ) ;
	296	sigma = SigmaP( energy, phi*180./TMath::Pi() ) ;
	297	Double_t z = fRan.Gaus( pos.Z(), sigma ) ;
	298	Double_t y = pos.Y() ;
	299
	300	newpos.SetX(x) ;
	301	newpos.SetY(y) ;
	302	newpos.SetZ(z) ;
	303
	304	return newpos ;
	305	}
a73f33f0	306
b1aa729d	307	//____________________________________________________________________________
	308	void AliPHOSvFast::MakeRecParticle(const Int_t modid, const TVector3 pos, AliPHOSFastRecParticle & rp)
	309	{
b2a60966	310	// Modify the primary particle properties according
	311	// 1. the response function of PHOS
	312	// 2. the performance of the EMC+PPSD setup
	313
b1aa729d	314	Int_t type = MakeType( rp ) ;
a73f33f0	315	rp.SetType(type) ;
	316
	317
	318	// get the detected energy
	319
	320	TLorentzVector momentum ;
	321	rp.Momentum(momentum) ;
	322	Double_t kineticenergy = TMath::Sqrt( TMath::Power(momentum.E(), 2) - TMath::Power(rp.GetMass(), 2) ) ;
	323	Double_t modifiedkineticenergy = MakeEnergy(kineticenergy ) ;
b1aa729d	324	Double_t modifiedenergy = TMath::Sqrt( TMath::Power(modifiedkineticenergy, 2)
	325	+ TMath::Power( rp.GetMass(), 2) ) ;
	326
	327	// get the angle of incidence
	328
	329	Double_t incidencetheta = 90. * TMath::Pi() /180 - rp.Theta() ;
fa7cce36	330	Double_t incidencephi = ( 270 + GetGeometry()->GetPHOSAngle(modid) ) * TMath::Pi() / 180. - rp.Phi() ;
b1aa729d	331
	332	// get the detected direction
	333
	334	TVector3 modifiedposition = MakePosition(kineticenergy, pos, incidencetheta, incidencephi) ;
	335	modifiedposition *= modifiedkineticenergy / modifiedposition.Mag() ;
	336
	337	// Set the modified 4-momentum of the reconstructed particle
	338
	339	rp.SetMomentum(modifiedposition.X(), modifiedposition.Y(), modifiedposition.Z(), modifiedenergy) ;
	340
a73f33f0	341	}
	342
	343	//____________________________________________________________________________
b1aa729d	344	Int_t AliPHOSvFast::MakeType(AliPHOSFastRecParticle & rp )
a73f33f0	345	{
b2a60966	346	// Generate a particle type using the performance of the EMC+PPSD setup
b2a60966	347
9ec91567	348	Int_t rv = AliPHOSFastRecParticle::kUNDEFINED ;
b1aa729d	349	Int_t charge = (Int_t)rp.GetPDG()->Charge() ;
	350	Int_t test ;
	351	Float_t ran ;
f96d3dc7	352	if ( charge != 0 && ( TMath::Abs(rp.GetPdgCode()) != 11 ) )
b1aa729d	353	test = - 1 ;
	354	else
	355	test = rp.GetPdgCode() ;
	356
21cd0c07	357	Info("MakeType", "SHOULD NOT BE USED until values of probabilities are properly set ") ;
21cd0c07	358	assert(1==0) ; // NB: ALL VALUES SHOULD BE CHECKED !!!!
b1aa729d	359	switch (test) {
b1aa729d	360
3a4295ee	361	case 22: // it's a photon // NB: ALL VALUES SHOLD BE CHECKED !!!!
b1aa729d	362	ran = fRan.Rndm() ;
3a4295ee	363	if( ran <= 0.9498 )
	364	rv = AliPHOSFastRecParticle::kNEUTRALHAFAST ;
	365	else
	366	rv = AliPHOSFastRecParticle::kNEUTRALEMFAST ;
b1aa729d	367	break ;
	368
	369	case 2112: // it's a neutron
	370	ran = fRan.Rndm() ;
	371	if ( ran <= 0.9998 )
3a4295ee	372	rv = AliPHOSFastRecParticle::kNEUTRALHASLOW ;
b1aa729d	373	else
3a4295ee	374	rv = AliPHOSFastRecParticle::kNEUTRALEMSLOW ;
b1aa729d	375	break ;
3a4295ee	376
b1aa729d	377	case -2112: // it's a anti-neutron
	378	ran = fRan.Rndm() ;
	379	if ( ran <= 0.9984 )
3a4295ee	380	rv = AliPHOSFastRecParticle::kNEUTRALHASLOW ;
b1aa729d	381	else
3a4295ee	382	rv = AliPHOSFastRecParticle::kNEUTRALEMSLOW ;
b1aa729d	383	break ;
	384
	385	case 11: // it's a electron
	386	ran = fRan.Rndm() ;
	387	if ( ran <= 0.9996 )
3a4295ee	388	rv = AliPHOSFastRecParticle::kCHARGEDEMFAST ;
b1aa729d	389	else
3a4295ee	390	rv = AliPHOSFastRecParticle::kCHARGEDHAFAST ;
b1aa729d	391	break;
b1aa729d	392
f96d3dc7	393	case -11: // it's a positon
b1aa729d	394	ran = fRan.Rndm() ;
b1aa729d	395	if ( ran <= 0.9996 )
3a4295ee	396	rv = AliPHOSFastRecParticle::kCHARGEDEMFAST ;
b1aa729d	397	else
3a4295ee	398	rv = AliPHOSFastRecParticle::kCHARGEDHAFAST ;
b1aa729d	399	break;
	400
	401	case -1: // it's a charged
	402	ran = fRan.Rndm() ;
	403	if ( ran <= 0.9996 )
3a4295ee	404	rv = AliPHOSFastRecParticle::kCHARGEDHAFAST ;
b1aa729d	405	else
3a4295ee	406	rv = AliPHOSFastRecParticle::kNEUTRALHAFAST ;
b1aa729d	407
	408	break ;
	409	}
	410
	411
a73f33f0	412	return rv ;
	413	}
	414
f96d3dc7	415	//___________________________________________________________________________
	416	void AliPHOSvFast::ResetPoints()
	417	{
b2a60966	418	// This overloads the method in AliDetector
b2a60966	419
f96d3dc7	420	ResetFastRecParticles() ;
	421	}
	422
	423	//___________________________________________________________________________
	424	void AliPHOSvFast::ResetFastRecParticles()
	425	{
b2a60966	426	// Resets the list of virtual reconstructed particles
b2a60966	427
f96d3dc7	428	if (fFastRecParticles)
	429	fFastRecParticles->Clear() ;
	430	fNRecParticles = 0 ;
	431	}
	432
3decf5cb	433	//___________________________________________________________________________
	434	void AliPHOSvFast::SetBigBox(Int_t index, Float_t value)
	435	{
b2a60966	436	// Set the size of the Box describing a PHOS module
b2a60966	437
3decf5cb	438	switch (index) {
	439	case 0:
	440	fBigBoxX = value ;
	441	break ;
	442	case 1:
	443	fBigBoxY = value ;
	444	break ;
	445	case 2:
	446	fBigBoxZ = value ;
	447	break ;
	448	}
	449
	450	}
	451
a73f33f0	452	//____________________________________________________________________________
	453	Double_t AliPHOSvFast::SigmaE(Double_t energy)
	454	{
b2a60966	455	// Calculates the energy dependent energy resolution
b2a60966	456
a73f33f0	457	Double_t rv = -1 ;
	458
	459	rv = TMath::Sqrt( TMath::Power(fResPara1/energy, 2)
	460	+ TMath::Power(fResPara2/TMath::Sqrt(energy), 2)
	461	+ TMath::Power(fResPara3, 2) ) ;
	462
	463	return rv * energy ;
	464	}
	465
b1aa729d	466	//____________________________________________________________________________
7a9d98f9	467	Double_t AliPHOSvFast::SigmaP(Double_t energy, Double_t incidence)
b1aa729d	468	{
b2a60966	469	// Calculates the energy dependent position resolution
b2a60966	470
b1aa729d	471	Double_t paraA = fPosParaA0 + fPosParaA1 * incidence ;
	472	Double_t paraB = fPosParaB0 + fPosParaB1 * incidence + fPosParaB2 * incidence * incidence ;
	473
	474	return ( paraA / TMath::Sqrt(energy) + paraB ) * 0.1 ; // in cm
	475	}
	476
3decf5cb	477	//____________________________________________________________________________
	478	void AliPHOSvFast::StepManager(void)
	479	{
b2a60966	480	// Only verifies if the particle reaches PHOS and stops the tracking
3a4295ee	481
a73f33f0	482	TLorentzVector lv ;
a73f33f0	483	gMC->TrackPosition(lv) ;
b1aa729d	484	TVector3 pos = lv.Vect() ;
	485	Int_t modid ;
	486	gMC->CurrentVolID(modid);
a73f33f0	487
3a4295ee	488	Float_t energy = gMC->Etot() ; //Total energy of current track
3decf5cb	489
3a4295ee	490	//Calculating mass of current particle
	491	TDatabasePDG * pdg = TDatabasePDG::Instance() ;
	492	TParticlePDG * partPDG = pdg->GetParticle(gMC->TrackPid()) ;
	493	Float_t mass = partPDG->Mass() ;
a73f33f0	494
3a4295ee	495	if(energy > mass){
	496	pos.SetMag(TMath::Sqrt(energyenergy-massmass)) ;
	497	TLorentzVector pTrack(pos, energy) ;
a73f33f0	498
3a4295ee	499	TParticle * part = new TParticle(gMC->TrackPid(), 0,-1,-1,-1,-1, pTrack, lv) ;
	500
	501	AliPHOSFastRecParticle rp(*part) ;
b1aa729d	502
3a4295ee	503	// Adds the response of PHOS to the particle
	504	MakeRecParticle(modid, pos, rp) ;
	505
	506	// add the `track' particle to the FastRecParticles list
b1aa729d	507
3a4295ee	508	AddRecParticle(rp) ;
a73f33f0	509
3a4295ee	510	part->Delete() ;
3a4295ee	511	}
a73f33f0	512	// stop the track as soon PHOS is reached
b1aa729d	513
3decf5cb	514	gMC->StopTrack() ;
	515
	516	}
	517