[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 "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

  // gets an instance of the geometry parameters class  
  if (strcmp(GetTitle(),"") != 0 ) 
    fGeom = AliPHOSGeometry::GetInstance(GetTitle(), "") ; 
     
    
    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 = (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, Int_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"
	44	#include "AliRun.h"
	45	#include "AliConst.h"
94de3818	46	#include "AliMC.h"
5f20d3fb	47
	48	ClassImp(AliPHOSv4)
	49
735e58f1	50	//____________________________________________________________________________
33faac69	51	AliPHOSv4::AliPHOSv4() : AliPHOS()
735e58f1	52	{
	53	// default ctor : initialize data member
	54	fBigBoxX = 0. ;
	55	fBigBoxY = 0. ;
	56	fBigBoxZ = 0. ;
	57	fFastRecParticles = 0 ;
	58	fNRecParticles = 0 ;
	59	fRan = 0 ;
	60	fResPara1 = 0. ;
	61	fResPara2 = 0. ;
	62	fResPara3 = 0. ;
	63	fPosParaA0 = 0. ;
	64	fPosParaA1 = 0. ;
	65	fPosParaB0 = 0. ;
	66	fPosParaB1 = 0. ;
	67	fPosParaB2 = 0. ;
	68
	69	}
	70
5f20d3fb	71	//____________________________________________________________________________
	72	AliPHOSv4::AliPHOSv4(const char name, const char title):
	73	AliPHOS(name,title)
	74	{
	75	// ctor
	76
	77	// gets an instance of the geometry parameters class
5cbba5aa	78	if (strcmp(GetTitle(),"") != 0 )
fa7cce36	79	fGeom = AliPHOSGeometry::GetInstance(GetTitle(), "") ;
e04976bd	80
aafe457d	81
fa7cce36	82	SetBigBox(0, GetGeometry()->GetOuterBoxSize(0) ) ;
	83	SetBigBox(1, GetGeometry()->GetOuterBoxSize(1) + GetGeometry()->GetCPVBoxSize(1) ) ;
	84	SetBigBox(2, GetGeometry()->GetOuterBoxSize(0) );
aafe457d	85
	86	fNRecParticles = 0 ;
	87	fFastRecParticles = new AliPHOSFastRecParticle::FastRecParticlesList("AliPHOSFastRecParticle", 100) ;
5cbba5aa	88
aafe457d	89	fResPara1 = 0.030 ; // GeV
	90	fResPara2 = 0.00003 ;
	91	fResPara3 = 0.00001 ;
	92
	93	fPosParaA0 = 2.87 ; // mm
	94	fPosParaA1 = -0.0975 ;
	95	fPosParaB0 = 0.257 ;
	96	fPosParaB1 = 0.137 ;
	97	fPosParaB2 = 0.00619 ;
5f20d3fb	98	}
	99
	100	//____________________________________________________________________________
	101	AliPHOSv4::~AliPHOSv4()
	102	{
	103	// dtor
	104
	105	fFastRecParticles->Delete() ;
	106	delete fFastRecParticles ;
	107	fFastRecParticles = 0 ;
	108
	109	}
	110
	111	//____________________________________________________________________________
	112	void AliPHOSv4::AddRecParticle(const AliPHOSFastRecParticle & rp)
	113	{
	114	// Add a virtually reconstructed particle to the list
	115
	116	new( (*fFastRecParticles)[fNRecParticles] ) AliPHOSFastRecParticle(rp) ;
	117	fNRecParticles++ ;
	118	}
	119
	120	//____________________________________________________________________________
	121	void AliPHOSv4::BuildGeometry()
	122	{
	123	// Build the PHOS geometry for the ROOT display
	124	//BEGIN_HTML
	125	/*
	126	<H2>
	127	PHOS FAST in ALICE displayed by root
	128	</H2>
	129	<H4> All Views </H4>
	130	<P>
	131	<CENTER>
	132	<IMG Align=BOTTOM ALT="Fast All Views" SRC="../images/AliPHOSv4AllViews.gif">
	133	</CENTER></P>
	134	<H4> Front View </H4>
	135	<P>
	136	<CENTER>
	137	<IMG Align=BOTTOM ALT="Fast Front View" SRC="../images/AliPHOSv4FrontView.gif">
	138	</CENTER></P>
	139	*/
	140	//END_HTML
	141
	142	const Int_t kColorPHOS = kRed ;
	143
	144	Double_t const kRADDEG = 180.0 / kPI ;
	145
	146	new TBRIK( "BigBox", "PHOS box", "void", GetBigBox(0)/2,
	147	GetBigBox(1)/2,
	148	GetBigBox(2)/2 );
	149
	150	// position PHOS into ALICE
	151
fa7cce36	152	Float_t r = GetGeometry()->GetIPtoCrystalSurface() + GetBigBox(1) / 2.0 ;
5f20d3fb	153	Int_t number = 988 ;
fa7cce36	154	Float_t pphi = TMath::ATan( GetBigBox(0) / ( 2.0 * GetGeometry()->GetIPtoCrystalSurface() ) ) ;
5f20d3fb	155	pphi *= kRADDEG ;
	156	TNode * top = gAlice->GetGeometry()->GetNode("alice") ;
	157
	158	char * nodename = new char[20] ;
	159	char * rotname = new char[20] ;
	160
fa7cce36	161	for( Int_t i = 1; i <= GetGeometry()->GetNModules(); i++ ) {
fa7cce36	162	Float_t angle = pphi * 2 * ( i - GetGeometry()->GetNModules() / 2.0 - 0.5 ) ;
5f20d3fb	163	sprintf(rotname, "%s%d", "rot", number++) ;
	164	new TRotMatrix(rotname, rotname, 90, angle, 90, 90 + angle, 0, 0);
	165	top->cd();
	166	sprintf(nodename,"%s%d", "Module", i) ;
	167	Float_t x = r * TMath::Sin( angle / kRADDEG ) ;
	168	Float_t y = -r * TMath::Cos( angle / kRADDEG ) ;
	169	TNode * bigboxnode = new TNode(nodename, nodename, "BigBox", x, y, 0, rotname ) ;
	170	bigboxnode->SetLineColor(kColorPHOS) ;
	171	fNodes->Add(bigboxnode) ;
	172	}
	173	delete[] nodename ;
	174	delete[] rotname ;
	175	}
	176
	177	//____________________________________________________________________________
	178	void AliPHOSv4::CreateGeometry()
	179	{
	180	// Create the geometry for GEANT
	181
	182	AliPHOSv4 phostmp = (AliPHOSv4)gAlice->GetModule("PHOS") ;
	183
	184	if ( phostmp == NULL ) {
	185
	186	fprintf(stderr, "PHOS detector not found!\n") ;
	187	return ;
	188
	189	}
	190
	191	// Get pointer to the array containing media indeces
	192	Int_t *idtmed = fIdtmed->GetArray() - 699 ;
	193
	194	Float_t bigbox[3] ;
	195	bigbox[0] = GetBigBox(0) / 2.0 ;
	196	bigbox[1] = GetBigBox(1) / 2.0 ;
	197	bigbox[2] = GetBigBox(2) / 2.0 ;
	198
	199	gMC->Gsvolu("PHOS", "BOX ", idtmed[798], bigbox, 3) ;
	200
	201	// --- Position PHOS mdules in ALICE setup ---
	202
	203	Int_t idrotm[99] ;
	204	Double_t const kRADDEG = 180.0 / kPI ;
	205
fa7cce36	206	for( Int_t i = 1; i <= GetGeometry()->GetNModules(); i++ ) {
5f20d3fb	207
fa7cce36	208	Float_t angle = GetGeometry()->GetPHOSAngle(i) ;
5f20d3fb	209	AliMatrix(idrotm[i-1], 90.0, angle, 90.0, 90.0+angle, 0.0, 0.0) ;
5f20d3fb	210
fa7cce36	211	Float_t r = GetGeometry()->GetIPtoCrystalSurface() + GetBigBox(1) / 2.0 ;
5f20d3fb	212
	213	Float_t xP1 = r * TMath::Sin( angle / kRADDEG ) ;
	214	Float_t yP1 = -r * TMath::Cos( angle / kRADDEG ) ;
	215	gMC->Gspos("PHOS", i, "ALIC", xP1, yP1, 0.0, idrotm[i-1], "ONLY") ;
	216
	217	} // for GetNModules
	218
	219	}
	220
	221
	222	//____________________________________________________________________________
	223	void AliPHOSv4::Init(void)
	224	{
	225	// Prints out an information message
	226
	227	Int_t i;
	228
	229	printf("\n");
	230	for(i=0;i<35;i++) printf("*");
	231	printf(" FAST PHOS_INIT ");
	232	for(i=0;i<35;i++) printf("*");
	233	printf("\n");
	234
	235	// Here the PHOS initialisation code (if any!)
	236
	237	for(i=0;i<80;i++) printf("*");
	238	printf("\n");
	239
	240	}
	241
	242	//___________________________________________________________________________
baef0810	243	Float_t AliPHOSv4::GetBigBox(Int_t index) const
5f20d3fb	244	{
	245	// Get the X, Y or Z dimension of the box describing a PHOS module
	246
	247	Float_t rv = 0 ;
	248
	249	switch (index) {
	250	case 0:
	251	rv = fBigBoxX ;
	252	break ;
	253	case 1:
	254	rv = fBigBoxY ;
	255	break ;
	256	case 2:
	257	rv = fBigBoxZ ;
	258	break ;
	259	}
	260	return rv ;
	261	}
	262
	263	//___________________________________________________________________________
9e1a0ddb	264	void AliPHOSv4::MakeBranch(Option_t* opt, const char *file)
5f20d3fb	265	{
	266	// Create new branch in the current reconstructed Root Tree
	267
2ab0c725	268	AliDetector::MakeBranch(opt,file) ;
5f20d3fb	269
	270	char branchname[10];
	271	sprintf(branchname,"%s",GetName());
5cf7bbad	272	const char *cd = strstr(opt,"R");
5f20d3fb	273
5f20d3fb	274	if (fFastRecParticles && gAlice->TreeR() && cd) {
9e1a0ddb	275	MakeBranchInTree(gAlice->TreeR(),
9e1a0ddb	276	branchname, &fFastRecParticles, fBufferSize, file);
5f20d3fb	277	}
	278	}
	279
	280	//____________________________________________________________________________
	281	Double_t AliPHOSv4::MakeEnergy(const Double_t energy)
	282	{
	283	// Smears the energy according to the energy dependent energy resolution.
	284	// A gaussian distribution is assumed
	285
	286	Double_t sigma = SigmaE(energy) ;
	287	return fRan.Gaus(energy, sigma) ;
	288	}
	289
	290	//____________________________________________________________________________
	291	TVector3 AliPHOSv4::MakePosition(const Double_t energy, const TVector3 pos, const Double_t theta, const Double_t phi)
	292	{
	293	// Smears the impact position according to the energy dependent position resolution
	294	// A gaussian position distribution is assumed
	295
	296	TVector3 newpos ;
	297	Double_t sigma = SigmaP( energy, theta*180./TMath::Pi() ) ;
	298	Double_t x = fRan.Gaus( pos.X(), sigma ) ;
	299	sigma = SigmaP( energy, phi*180./TMath::Pi() ) ;
	300	Double_t z = fRan.Gaus( pos.Z(), sigma ) ;
	301	Double_t y = pos.Y() ;
	302
	303	newpos.SetX(x) ;
	304	newpos.SetY(y) ;
	305	newpos.SetZ(z) ;
	306
	307	return newpos ;
	308	}
	309
	310	//____________________________________________________________________________
	311	void AliPHOSv4::MakeRecParticle(const Int_t modid, const TVector3 pos, AliPHOSFastRecParticle & rp)
	312	{
	313	// Modify the primary particle properties according
	314	// 1. the response function of PHOS
	315	// 2. the performance of the EMC+PPSD setup
	316
	317	Int_t type = MakeType( rp ) ;
	318	rp.SetType(type) ;
	319
	320
	321	// get the detected energy
	322
	323	TLorentzVector momentum ;
	324	rp.Momentum(momentum) ;
	325	Double_t kineticenergy = TMath::Sqrt( TMath::Power(momentum.E(), 2) - TMath::Power(rp.GetMass(), 2) ) ;
	326	Double_t modifiedkineticenergy = MakeEnergy(kineticenergy ) ;
	327	Double_t modifiedenergy = TMath::Sqrt( TMath::Power(modifiedkineticenergy, 2)
	328	+ TMath::Power( rp.GetMass(), 2) ) ;
	329
	330	// get the angle of incidence
	331
	332	Double_t incidencetheta = 90. * TMath::Pi() /180 - rp.Theta() ;
fa7cce36	333	Double_t incidencephi = ( 270 + GetGeometry()->GetPHOSAngle(modid) ) * TMath::Pi() / 180. - rp.Phi() ;
5f20d3fb	334
	335	// get the detected direction
	336
	337	TVector3 modifiedposition = MakePosition(kineticenergy, pos, incidencetheta, incidencephi) ;
	338	modifiedposition *= modifiedkineticenergy / modifiedposition.Mag() ;
	339
	340	// Set the modified 4-momentum of the reconstructed particle
	341
	342	rp.SetMomentum(modifiedposition.X(), modifiedposition.Y(), modifiedposition.Z(), modifiedenergy) ;
	343
	344	}
	345
	346	//____________________________________________________________________________
	347	Int_t AliPHOSv4::MakeType(AliPHOSFastRecParticle & rp )
	348	{
	349	// Generate a particle type using the performance of the EMC+PPSD setup
	350
	351	Int_t rv = AliPHOSFastRecParticle::kUNDEFINED ;
	352	Int_t charge = (Int_t)rp.GetPDG()->Charge() ;
	353	Int_t test ;
	354	Float_t ran ;
	355	if ( charge != 0 && ( TMath::Abs(rp.GetPdgCode()) != 11 ) )
	356	test = - 1 ;
	357	else
	358	test = rp.GetPdgCode() ;
	359
	360	switch (test) {
	361
	362	case 22: // it's a photon
	363	ran = fRan.Rndm() ;
	364	if ( ran <= 0.5 ) // 50 %
	365	rv = AliPHOSFastRecParticle::kGAMMA ;
	366	else {
	367	ran = fRan.Rndm() ;
	368	if( ran <= 0.9498 )
	369	rv = AliPHOSFastRecParticle::kNEUTRALEM ;
	370	else
	371	rv = AliPHOSFastRecParticle::kNEUTRALHA ;
	372	}
	373	break ;
	374
	375	case 2112: // it's a neutron
	376	ran = fRan.Rndm() ;
	377	if ( ran <= 0.9998 )
	378	rv = AliPHOSFastRecParticle::kNEUTRALHA ;
	379	else
	380	rv = AliPHOSFastRecParticle::kNEUTRALEM ;
	381	break ;
	382
	383	case -2112: // it's a anti-neutron
	384	ran = fRan.Rndm() ;
	385	if ( ran <= 0.9984 )
	386	rv = AliPHOSFastRecParticle::kNEUTRALHA ;
	387	else
	388	rv = AliPHOSFastRecParticle::kNEUTRALEM ;
	389	break ;
	390
	391	case 11: // it's a electron
	392	ran = fRan.Rndm() ;
	393	if ( ran <= 0.9996 )
	394	rv = AliPHOSFastRecParticle::kELECTRON ;
	395	else
	396	rv = AliPHOSFastRecParticle::kCHARGEDHA ;
	397	break;
398
399	case -11: // it's a positon
400	ran = fRan.Rndm() ;
401	if ( ran <= 0.9996 )
402	rv = AliPHOSFastRecParticle::kELECTRON ;
403	else
404	rv = AliPHOSFastRecParticle::kCHARGEDHA ;
405	break;
406
407	case -1: // it's a charged
408	ran = fRan.Rndm() ;
409	if ( ran <= 0.9996 )
410	rv = AliPHOSFastRecParticle::kCHARGEDHA ;
411	else
412	rv = AliPHOSFastRecParticle::kGAMMA ;
413
414	break ;
415	}
416
417
418	return rv ;
419	}
420
421	//___________________________________________________________________________
422	void AliPHOSv4::ResetPoints()
423	{
424	// This overloads the method in AliDetector
425
426	ResetFastRecParticles() ;
427	}
428
429	//___________________________________________________________________________
430	void AliPHOSv4::ResetFastRecParticles()
431	{
432	// Resets the list of virtual reconstructed particles
433
434	if (fFastRecParticles)
435	fFastRecParticles->Clear() ;
436	fNRecParticles = 0 ;
437	}
438
439	//___________________________________________________________________________
440	void AliPHOSv4::SetBigBox(Int_t index, Float_t value)
441	{
442	// Set the size of the Box describing a PHOS module
443
444	switch (index) {
445	case 0:
446	fBigBoxX = value ;
447	break ;
448	case 1:
449	fBigBoxY = value ;
450	break ;
451	case 2:
452	fBigBoxZ = value ;
453	break ;
454	}
455
456	}
457
458	//____________________________________________________________________________
459	Double_t AliPHOSv4::SigmaE(Double_t energy)
460	{
461	// Calculates the energy dependent energy resolution
462
463	Double_t rv = -1 ;
464
465	rv = TMath::Sqrt( TMath::Power(fResPara1/energy, 2)
466	+ TMath::Power(fResPara2/TMath::Sqrt(energy), 2)
467	+ TMath::Power(fResPara3, 2) ) ;
468
469	return rv * energy ;
470	}
471
472	//____________________________________________________________________________
473	Double_t AliPHOSv4::SigmaP(Double_t energy, Int_t incidence)
474	{
475	// Calculates the energy dependent position resolution
476
477	Double_t paraA = fPosParaA0 + fPosParaA1 * incidence ;
478	Double_t paraB = fPosParaB0 + fPosParaB1 * incidence + fPosParaB2 * incidence * incidence ;
479
480	return ( paraA / TMath::Sqrt(energy) + paraB ) * 0.1 ; // in cm
481	}
482
483	//____________________________________________________________________________
484	void AliPHOSv4::StepManager(void)
485	{
486	// Only verifies if the particle reaches PHOS and stops the tracking
5cbba5aa	487
5f20d3fb	488	Int_t primary = gAlice->GetPrimary( gAlice->CurrentTrack() );
5cbba5aa	489
5f20d3fb	490	TLorentzVector lv ;
	491	gMC->TrackPosition(lv) ;
	492	TVector3 pos = lv.Vect() ;
	493	Int_t modid ;
	494	gMC->CurrentVolID(modid);
	495
2f04ed65	496	Float_t energy = gMC->Etot() ; //Total energy of current track
5cbba5aa	497
5cbba5aa	498	//Calculating mass of current particle
2f04ed65	499	TDatabasePDG * pdg = TDatabasePDG::Instance() ;
2f04ed65	500	TParticlePDG * partPDG = pdg->GetParticle(gMC->TrackPid()) ;
5cbba5aa	501	Float_t mass = partPDG->Mass() ;
5f20d3fb	502
2f04ed65	503	if(energy > mass){
	504	pos.SetMag(TMath::Sqrt(energyenergy-massmass)) ;
	505	TLorentzVector pTrack(pos, energy) ;
5cbba5aa	506
	507	TParticle * part = new TParticle(gMC->TrackPid(), 0,-1,-1,-1,-1, pTrack, lv) ;
	508
	509	AliPHOSFastRecParticle rp(*part) ;
	510	rp.SetPrimary(primary) ;
	511
	512	// Adds the response of PHOS to the particle
	513	MakeRecParticle(modid, pos, rp) ;
	514
	515	// add the `track' particle to the FastRecParticles list
5f20d3fb	516
5cbba5aa	517	AddRecParticle(rp) ;
5f20d3fb	518
5cbba5aa	519	part->Delete() ;
5cbba5aa	520	}
5f20d3fb	521	// stop the track as soon PHOS is reached
	522
	523	gMC->StopTrack() ;
	524
	525	}
	526