[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 <TFile.h>
#include <TGeometry.h>
#include <TNode.h>
#include <TParticle.h>
#include <TTree.h>
#include <TVirtualMC.h>

// --- Standard library ---

// --- AliRoot header files ---
#include "AliConst.h"
#include "AliPHOSFastRecParticle.h"
#include "AliPHOSGeometry.h"
#include "AliPHOSLoader.h"
#include "AliPHOSvFast.h"
#include "AliRun.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 Loader 
  
  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 / TMath::Pi() ;
  
  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 / TMath::Pi() ;
  
  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)
{  
  // Create new branch in the current reconstructed Root Tree
  AliDetector::MakeBranch(opt);
  const char *cd = strstr(opt,"R");
  
  if (fFastRecParticles && fLoader->TreeR() && cd) {
    MakeBranchInTree(fLoader->TreeR(), GetName(), &fFastRecParticles, fBufferSize, 0);
  }
}
//____________________________________________________________________________

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
88cb7938	1	/**************************************************************************
3decf5cb	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
88cb7938	29	#include <TBRIK.h>
	30	#include <TFile.h>
	31	#include <TGeometry.h>
	32	#include <TNode.h>
	33	#include <TParticle.h>
	34	#include <TTree.h>
	35	#include <TVirtualMC.h>
3decf5cb	36
	37	// --- Standard library ---
	38
3decf5cb	39	// --- AliRoot header files ---
88cb7938	40	#include "AliConst.h"
3a4295ee	41	#include "AliPHOSFastRecParticle.h"
88cb7938	42	#include "AliPHOSGeometry.h"
88cb7938	43	#include "AliPHOSLoader.h"
3decf5cb	44	#include "AliPHOSvFast.h"
3decf5cb	45	#include "AliRun.h"
3decf5cb	46
	47	ClassImp(AliPHOSvFast)
	48
	49	//____________________________________________________________________________
3a4295ee	50	AliPHOSvFast::AliPHOSvFast() : AliPHOS()
3decf5cb	51	{
3a4295ee	52	// default ctor : initialize data member
	53	fBigBoxX = 0. ;
	54	fBigBoxY = 0. ;
	55	fBigBoxZ = 0. ;
	56	fFastRecParticles = 0 ;
	57	fNRecParticles = 0 ;
	58	fRan = 0 ;
	59	fResPara1 = 0. ;
	60	fResPara2 = 0. ;
	61	fResPara3 = 0. ;
	62	fPosParaA0 = 0. ;
	63	fPosParaA1 = 0. ;
	64	fPosParaB0 = 0. ;
	65	fPosParaB1 = 0. ;
	66	fPosParaB2 = 0. ;
b2a60966	67
3decf5cb	68	}
	69
	70	//____________________________________________________________________________
	71	AliPHOSvFast::AliPHOSvFast(const char name, const char title):
	72	AliPHOS(name,title)
	73	{
b2a60966	74	// ctor
b2a60966	75
3decf5cb	76
88cb7938	77	// create the Loader
7a9d98f9	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 ;
3decf5cb	140
a8c47ab6	141	Double_t const kRADDEG = 180.0 / TMath::Pi() ;
3decf5cb	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] ;
a8c47ab6	201	Double_t const kRADDEG = 180.0 / TMath::Pi() ;
3decf5cb	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	}
3decf5cb	259	//___________________________________________________________________________
88cb7938	260
88cb7938	261	void AliPHOSvFast::MakeBranch(Option_t* opt)
3decf5cb	262	{
b2a60966	263	// Create new branch in the current reconstructed Root Tree
88cb7938	264	AliDetector::MakeBranch(opt);
3a4295ee	265	const char *cd = strstr(opt,"R");
3decf5cb	266
88cb7938	267	if (fFastRecParticles && fLoader->TreeR() && cd) {
88cb7938	268	MakeBranchInTree(fLoader->TreeR(), GetName(), &fFastRecParticles, fBufferSize, 0);
3decf5cb	269	}
3decf5cb	270	}
a73f33f0	271	//____________________________________________________________________________
88cb7938	272
a73f33f0	273	Double_t AliPHOSvFast::MakeEnergy(const Double_t energy)
a73f33f0	274	{
b2a60966	275	// Smears the energy according to the energy dependent energy resolution.
	276	// A gaussian distribution is assumed
	277
b1aa729d	278	Double_t sigma = SigmaE(energy) ;
b1aa729d	279	return fRan.Gaus(energy, sigma) ;
a73f33f0	280	}
a73f33f0	281	//____________________________________________________________________________
88cb7938	282
b1aa729d	283	TVector3 AliPHOSvFast::MakePosition(const Double_t energy, const TVector3 pos, const Double_t theta, const Double_t phi)
a73f33f0	284	{
b2a60966	285	// Smears the impact position according to the energy dependent position resolution
	286	// A gaussian position distribution is assumed
	287
b1aa729d	288	TVector3 newpos ;
	289	Double_t sigma = SigmaP( energy, theta*180./TMath::Pi() ) ;
	290	Double_t x = fRan.Gaus( pos.X(), sigma ) ;
	291	sigma = SigmaP( energy, phi*180./TMath::Pi() ) ;
	292	Double_t z = fRan.Gaus( pos.Z(), sigma ) ;
	293	Double_t y = pos.Y() ;
	294
	295	newpos.SetX(x) ;
	296	newpos.SetY(y) ;
	297	newpos.SetZ(z) ;
	298
	299	return newpos ;
	300	}
a73f33f0	301
b1aa729d	302	//____________________________________________________________________________
	303	void AliPHOSvFast::MakeRecParticle(const Int_t modid, const TVector3 pos, AliPHOSFastRecParticle & rp)
	304	{
b2a60966	305	// Modify the primary particle properties according
	306	// 1. the response function of PHOS
	307	// 2. the performance of the EMC+PPSD setup
	308
b1aa729d	309	Int_t type = MakeType( rp ) ;
a73f33f0	310	rp.SetType(type) ;
	311
	312
	313	// get the detected energy
	314
	315	TLorentzVector momentum ;
	316	rp.Momentum(momentum) ;
	317	Double_t kineticenergy = TMath::Sqrt( TMath::Power(momentum.E(), 2) - TMath::Power(rp.GetMass(), 2) ) ;
	318	Double_t modifiedkineticenergy = MakeEnergy(kineticenergy ) ;
b1aa729d	319	Double_t modifiedenergy = TMath::Sqrt( TMath::Power(modifiedkineticenergy, 2)
	320	+ TMath::Power( rp.GetMass(), 2) ) ;
	321
	322	// get the angle of incidence
	323
	324	Double_t incidencetheta = 90. * TMath::Pi() /180 - rp.Theta() ;
fa7cce36	325	Double_t incidencephi = ( 270 + GetGeometry()->GetPHOSAngle(modid) ) * TMath::Pi() / 180. - rp.Phi() ;
b1aa729d	326
	327	// get the detected direction
	328
	329	TVector3 modifiedposition = MakePosition(kineticenergy, pos, incidencetheta, incidencephi) ;
	330	modifiedposition *= modifiedkineticenergy / modifiedposition.Mag() ;
	331
	332	// Set the modified 4-momentum of the reconstructed particle
	333
	334	rp.SetMomentum(modifiedposition.X(), modifiedposition.Y(), modifiedposition.Z(), modifiedenergy) ;
	335
a73f33f0	336	}
	337
	338	//____________________________________________________________________________
b1aa729d	339	Int_t AliPHOSvFast::MakeType(AliPHOSFastRecParticle & rp )
a73f33f0	340	{
b2a60966	341	// Generate a particle type using the performance of the EMC+PPSD setup
b2a60966	342
9ec91567	343	Int_t rv = AliPHOSFastRecParticle::kUNDEFINED ;
b1aa729d	344	Int_t charge = (Int_t)rp.GetPDG()->Charge() ;
	345	Int_t test ;
	346	Float_t ran ;
f96d3dc7	347	if ( charge != 0 && ( TMath::Abs(rp.GetPdgCode()) != 11 ) )
b1aa729d	348	test = - 1 ;
	349	else
	350	test = rp.GetPdgCode() ;
	351
88cb7938	352	Info("MakeType", "SHOULD NOT BE USED until values of probabilities are properly set ") ;
88cb7938	353	assert(1==0) ; // NB: ALL VALUES SHOULD BE CHECKED !!!!
b1aa729d	354	switch (test) {
b1aa729d	355
3a4295ee	356	case 22: // it's a photon // NB: ALL VALUES SHOLD BE CHECKED !!!!
b1aa729d	357	ran = fRan.Rndm() ;
3a4295ee	358	if( ran <= 0.9498 )
	359	rv = AliPHOSFastRecParticle::kNEUTRALHAFAST ;
	360	else
	361	rv = AliPHOSFastRecParticle::kNEUTRALEMFAST ;
b1aa729d	362	break ;
	363
	364	case 2112: // it's a neutron
	365	ran = fRan.Rndm() ;
	366	if ( ran <= 0.9998 )
3a4295ee	367	rv = AliPHOSFastRecParticle::kNEUTRALHASLOW ;
b1aa729d	368	else
3a4295ee	369	rv = AliPHOSFastRecParticle::kNEUTRALEMSLOW ;
b1aa729d	370	break ;
3a4295ee	371
b1aa729d	372	case -2112: // it's a anti-neutron
	373	ran = fRan.Rndm() ;
	374	if ( ran <= 0.9984 )
3a4295ee	375	rv = AliPHOSFastRecParticle::kNEUTRALHASLOW ;
b1aa729d	376	else
3a4295ee	377	rv = AliPHOSFastRecParticle::kNEUTRALEMSLOW ;
b1aa729d	378	break ;
	379
	380	case 11: // it's a electron
	381	ran = fRan.Rndm() ;
	382	if ( ran <= 0.9996 )
3a4295ee	383	rv = AliPHOSFastRecParticle::kCHARGEDEMFAST ;
b1aa729d	384	else
3a4295ee	385	rv = AliPHOSFastRecParticle::kCHARGEDHAFAST ;
b1aa729d	386	break;
b1aa729d	387
f96d3dc7	388	case -11: // it's a positon
b1aa729d	389	ran = fRan.Rndm() ;
b1aa729d	390	if ( ran <= 0.9996 )
3a4295ee	391	rv = AliPHOSFastRecParticle::kCHARGEDEMFAST ;
b1aa729d	392	else
3a4295ee	393	rv = AliPHOSFastRecParticle::kCHARGEDHAFAST ;
b1aa729d	394	break;
	395
	396	case -1: // it's a charged
	397	ran = fRan.Rndm() ;
	398	if ( ran <= 0.9996 )
3a4295ee	399	rv = AliPHOSFastRecParticle::kCHARGEDHAFAST ;
b1aa729d	400	else
3a4295ee	401	rv = AliPHOSFastRecParticle::kNEUTRALHAFAST ;
b1aa729d	402
	403	break ;
	404	}
	405
	406
a73f33f0	407	return rv ;
	408	}
	409
f96d3dc7	410	//___________________________________________________________________________
	411	void AliPHOSvFast::ResetPoints()
	412	{
b2a60966	413	// This overloads the method in AliDetector
b2a60966	414
f96d3dc7	415	ResetFastRecParticles() ;
	416	}
	417
	418	//___________________________________________________________________________
	419	void AliPHOSvFast::ResetFastRecParticles()
	420	{
b2a60966	421	// Resets the list of virtual reconstructed particles
b2a60966	422
f96d3dc7	423	if (fFastRecParticles)
	424	fFastRecParticles->Clear() ;
	425	fNRecParticles = 0 ;
	426	}
	427
3decf5cb	428	//___________________________________________________________________________
	429	void AliPHOSvFast::SetBigBox(Int_t index, Float_t value)
	430	{
b2a60966	431	// Set the size of the Box describing a PHOS module
b2a60966	432
3decf5cb	433	switch (index) {
	434	case 0:
	435	fBigBoxX = value ;
	436	break ;
	437	case 1:
	438	fBigBoxY = value ;
	439	break ;
	440	case 2:
	441	fBigBoxZ = value ;
	442	break ;
	443	}
	444
	445	}
	446
a73f33f0	447	//____________________________________________________________________________
	448	Double_t AliPHOSvFast::SigmaE(Double_t energy)
	449	{
b2a60966	450	// Calculates the energy dependent energy resolution
b2a60966	451
a73f33f0	452	Double_t rv = -1 ;
	453
	454	rv = TMath::Sqrt( TMath::Power(fResPara1/energy, 2)
	455	+ TMath::Power(fResPara2/TMath::Sqrt(energy), 2)
	456	+ TMath::Power(fResPara3, 2) ) ;
	457
	458	return rv * energy ;
	459	}
	460
b1aa729d	461	//____________________________________________________________________________
7a9d98f9	462	Double_t AliPHOSvFast::SigmaP(Double_t energy, Double_t incidence)
b1aa729d	463	{
b2a60966	464	// Calculates the energy dependent position resolution
b2a60966	465
b1aa729d	466	Double_t paraA = fPosParaA0 + fPosParaA1 * incidence ;
	467	Double_t paraB = fPosParaB0 + fPosParaB1 * incidence + fPosParaB2 * incidence * incidence ;
	468
	469	return ( paraA / TMath::Sqrt(energy) + paraB ) * 0.1 ; // in cm
	470	}
	471
3decf5cb	472	//____________________________________________________________________________
	473	void AliPHOSvFast::StepManager(void)
	474	{
b2a60966	475	// Only verifies if the particle reaches PHOS and stops the tracking
3a4295ee	476
a73f33f0	477	TLorentzVector lv ;
a73f33f0	478	gMC->TrackPosition(lv) ;
b1aa729d	479	TVector3 pos = lv.Vect() ;
	480	Int_t modid ;
	481	gMC->CurrentVolID(modid);
a73f33f0	482
3a4295ee	483	Float_t energy = gMC->Etot() ; //Total energy of current track
3decf5cb	484
3a4295ee	485	//Calculating mass of current particle
	486	TDatabasePDG * pdg = TDatabasePDG::Instance() ;
	487	TParticlePDG * partPDG = pdg->GetParticle(gMC->TrackPid()) ;
	488	Float_t mass = partPDG->Mass() ;
a73f33f0	489
3a4295ee	490	if(energy > mass){
	491	pos.SetMag(TMath::Sqrt(energyenergy-massmass)) ;
	492	TLorentzVector pTrack(pos, energy) ;
a73f33f0	493
3a4295ee	494	TParticle * part = new TParticle(gMC->TrackPid(), 0,-1,-1,-1,-1, pTrack, lv) ;
	495
	496	AliPHOSFastRecParticle rp(*part) ;
b1aa729d	497
3a4295ee	498	// Adds the response of PHOS to the particle
	499	MakeRecParticle(modid, pos, rp) ;
	500
	501	// add the `track' particle to the FastRecParticles list
b1aa729d	502
3a4295ee	503	AddRecParticle(rp) ;
a73f33f0	504
3a4295ee	505	part->Delete() ;
3a4295ee	506	}
a73f33f0	507	// stop the track as soon PHOS is reached
b1aa729d	508
3decf5cb	509	gMC->StopTrack() ;
	510
	511	}
	512