[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"
#include "AliMC.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() ; 

  cout << " SHOULD NOT BE USED until values of probabilities are properly set " << endl ;
  assert(1==0) ;    // NB: ALL VALUES SHOLD 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 

  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
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"
3decf5cb	44	#include "AliConst.h"
3a4295ee	45	#include "AliMC.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
7a9d98f9	77	// create the Getter
	78	AliPHOSGetter::GetInstance(gDirectory->GetName(), 0) ;
	79
	80	SetBigBox(0, GetGeometry()->GetOuterBoxSize(0) ) ;
	81	SetBigBox(1, GetGeometry()->GetOuterBoxSize(3) + GetGeometry()->GetCPVBoxSize(1) ) ;
	82	SetBigBox(2, GetGeometry()->GetOuterBoxSize(2) );
	83
	84	fNRecParticles = 0 ;
	85	fFastRecParticles = new AliPHOSFastRecParticle::FastRecParticlesList("AliPHOSFastRecParticle", 100) ;
	86
	87	fResPara1 = 0.030 ; // GeV
	88	fResPara2 = 0.00003 ;
	89	fResPara3 = 0.00001 ;
	90
	91	fPosParaA0 = 2.87 ; // mm
	92	fPosParaA1 = -0.0975 ;
	93	fPosParaB0 = 0.257 ;
	94	fPosParaB1 = 0.137 ;
	95	fPosParaB2 = 0.00619 ;
3decf5cb	96	}
	97
	98	//____________________________________________________________________________
	99	AliPHOSvFast::~AliPHOSvFast()
	100	{
b2a60966	101	// dtor
3decf5cb	102
a73f33f0	103	fFastRecParticles->Delete() ;
	104	delete fFastRecParticles ;
	105	fFastRecParticles = 0 ;
3decf5cb	106
	107	}
	108
	109	//____________________________________________________________________________
a73f33f0	110	void AliPHOSvFast::AddRecParticle(const AliPHOSFastRecParticle & rp)
a73f33f0	111	{
b2a60966	112	// Add a virtually reconstructed particle to the list
b2a60966	113
f96d3dc7	114	new( (*fFastRecParticles)[fNRecParticles] ) AliPHOSFastRecParticle(rp) ;
f96d3dc7	115	fNRecParticles++ ;
3decf5cb	116	}
	117
	118	//____________________________________________________________________________
	119	void AliPHOSvFast::BuildGeometry()
	120	{
3decf5cb	121	// Build the PHOS geometry for the ROOT display
b2a60966	122	//BEGIN_HTML
	123	/*
	124	<H2>
	125	PHOS FAST in ALICE displayed by root
	126	</H2>
	127	<H4> All Views </H4>
	128	<P>
	129	<CENTER>
	130	<IMG Align=BOTTOM ALT="Fast All Views" SRC="../images/AliPHOSvFastAllViews.gif">
	131	</CENTER></P>
	132	<H4> Front View </H4>
	133	<P>
	134	<CENTER>
	135	<IMG Align=BOTTOM ALT="Fast Front View" SRC="../images/AliPHOSvFastFrontView.gif">
	136	</CENTER></P>
	137	*/
	138	//END_HTML
	139
3decf5cb	140	const Int_t kColorPHOS = kRed ;
	141
	142	Double_t const kRADDEG = 180.0 / kPI ;
	143
	144	new TBRIK( "BigBox", "PHOS box", "void", GetBigBox(0)/2,
	145	GetBigBox(1)/2,
	146	GetBigBox(2)/2 );
	147
	148	// position PHOS into ALICE
	149
fa7cce36	150	Float_t r = GetGeometry()->GetIPtoCrystalSurface() + GetBigBox(1) / 2.0 ;
3decf5cb	151	Int_t number = 988 ;
fa7cce36	152	Float_t pphi = TMath::ATan( GetBigBox(0) / ( 2.0 * GetGeometry()->GetIPtoCrystalSurface() ) ) ;
3decf5cb	153	pphi *= kRADDEG ;
	154	TNode * top = gAlice->GetGeometry()->GetNode("alice") ;
	155
	156	char * nodename = new char[20] ;
	157	char * rotname = new char[20] ;
	158
fa7cce36	159	for( Int_t i = 1; i <= GetGeometry()->GetNModules(); i++ ) {
fa7cce36	160	Float_t angle = pphi * 2 * ( i - GetGeometry()->GetNModules() / 2.0 - 0.5 ) ;
3decf5cb	161	sprintf(rotname, "%s%d", "rot", number++) ;
	162	new TRotMatrix(rotname, rotname, 90, angle, 90, 90 + angle, 0, 0);
	163	top->cd();
	164	sprintf(nodename,"%s%d", "Module", i) ;
	165	Float_t x = r * TMath::Sin( angle / kRADDEG ) ;
	166	Float_t y = -r * TMath::Cos( angle / kRADDEG ) ;
	167	TNode * bigboxnode = new TNode(nodename, nodename, "BigBox", x, y, 0, rotname ) ;
	168	bigboxnode->SetLineColor(kColorPHOS) ;
	169	fNodes->Add(bigboxnode) ;
	170	}
	171	delete[] nodename ;
	172	delete[] rotname ;
	173	}
	174
	175	//____________________________________________________________________________
	176	void AliPHOSvFast::CreateGeometry()
	177	{
b2a60966	178	// Create the geometry for GEANT
b2a60966	179
3decf5cb	180	AliPHOSvFast phostmp = (AliPHOSvFast)gAlice->GetModule("PHOS") ;
b2a60966	181
3decf5cb	182	if ( phostmp == NULL ) {
	183
	184	fprintf(stderr, "PHOS detector not found!\n") ;
	185	return ;
	186
	187	}
	188
	189	// Get pointer to the array containing media indeces
	190	Int_t *idtmed = fIdtmed->GetArray() - 699 ;
	191
	192	Float_t bigbox[3] ;
	193	bigbox[0] = GetBigBox(0) / 2.0 ;
	194	bigbox[1] = GetBigBox(1) / 2.0 ;
	195	bigbox[2] = GetBigBox(2) / 2.0 ;
	196
	197	gMC->Gsvolu("PHOS", "BOX ", idtmed[798], bigbox, 3) ;
	198
	199	// --- Position PHOS mdules in ALICE setup ---
	200
	201	Int_t idrotm[99] ;
	202	Double_t const kRADDEG = 180.0 / kPI ;
	203
fa7cce36	204	for( Int_t i = 1; i <= GetGeometry()->GetNModules(); i++ ) {
3decf5cb	205
fa7cce36	206	Float_t angle = GetGeometry()->GetPHOSAngle(i) ;
3decf5cb	207	AliMatrix(idrotm[i-1], 90.0, angle, 90.0, 90.0+angle, 0.0, 0.0) ;
3decf5cb	208
fa7cce36	209	Float_t r = GetGeometry()->GetIPtoCrystalSurface() + GetBigBox(1) / 2.0 ;
3decf5cb	210
	211	Float_t xP1 = r * TMath::Sin( angle / kRADDEG ) ;
	212	Float_t yP1 = -r * TMath::Cos( angle / kRADDEG ) ;
3decf5cb	213	gMC->Gspos("PHOS", i, "ALIC", xP1, yP1, 0.0, idrotm[i-1], "ONLY") ;
	214
	215	} // for GetNModules
	216
	217	}
	218
	219
	220	//____________________________________________________________________________
	221	void AliPHOSvFast::Init(void)
	222	{
b2a60966	223	// Prints out an information message
b2a60966	224
3decf5cb	225	Int_t i;
	226
	227	printf("\n");
	228	for(i=0;i<35;i++) printf("*");
	229	printf(" FAST PHOS_INIT ");
	230	for(i=0;i<35;i++) printf("*");
	231	printf("\n");
	232
	233	// Here the PHOS initialisation code (if any!)
	234
	235	for(i=0;i<80;i++) printf("*");
	236	printf("\n");
	237
	238	}
	239
	240	//___________________________________________________________________________
3a4295ee	241	Float_t AliPHOSvFast::GetBigBox(Int_t index) const
3decf5cb	242	{
b2a60966	243	// Get the X, Y or Z dimension of the box describing a PHOS module
b2a60966	244
3decf5cb	245	Float_t rv = 0 ;
	246
	247	switch (index) {
	248	case 0:
	249	rv = fBigBoxX ;
	250	break ;
	251	case 1:
	252	rv = fBigBoxY ;
	253	break ;
	254	case 2:
	255	rv = fBigBoxZ ;
	256	break ;
	257	}
	258	return rv ;
	259	}
	260
	261	//___________________________________________________________________________
9e1a0ddb	262	void AliPHOSvFast::MakeBranch(Option_t* opt, const char *file)
3decf5cb	263	{
b2a60966	264	// Create new branch in the current reconstructed Root Tree
f96d3dc7	265
2ab0c725	266	AliDetector::MakeBranch(opt,file) ;
3decf5cb	267
	268	char branchname[10];
	269	sprintf(branchname,"%s",GetName());
3a4295ee	270	const char *cd = strstr(opt,"R");
3decf5cb	271
a73f33f0	272	if (fFastRecParticles && gAlice->TreeR() && cd) {
9e1a0ddb	273	MakeBranchInTree(gAlice->TreeR(),
9e1a0ddb	274	branchname, &fFastRecParticles, fBufferSize, file);
3decf5cb	275	}
	276	}
	277
a73f33f0	278	//____________________________________________________________________________
	279	Double_t AliPHOSvFast::MakeEnergy(const Double_t energy)
	280	{
b2a60966	281	// Smears the energy according to the energy dependent energy resolution.
	282	// A gaussian distribution is assumed
	283
b1aa729d	284	Double_t sigma = SigmaE(energy) ;
b1aa729d	285	return fRan.Gaus(energy, sigma) ;
a73f33f0	286	}
	287
	288	//____________________________________________________________________________
b1aa729d	289	TVector3 AliPHOSvFast::MakePosition(const Double_t energy, const TVector3 pos, const Double_t theta, const Double_t phi)
a73f33f0	290	{
b2a60966	291	// Smears the impact position according to the energy dependent position resolution
	292	// A gaussian position distribution is assumed
	293
b1aa729d	294	TVector3 newpos ;
	295	Double_t sigma = SigmaP( energy, theta*180./TMath::Pi() ) ;
	296	Double_t x = fRan.Gaus( pos.X(), sigma ) ;
	297	sigma = SigmaP( energy, phi*180./TMath::Pi() ) ;
	298	Double_t z = fRan.Gaus( pos.Z(), sigma ) ;
	299	Double_t y = pos.Y() ;
	300
	301	newpos.SetX(x) ;
	302	newpos.SetY(y) ;
	303	newpos.SetZ(z) ;
	304
	305	return newpos ;
	306	}
a73f33f0	307
b1aa729d	308	//____________________________________________________________________________
	309	void AliPHOSvFast::MakeRecParticle(const Int_t modid, const TVector3 pos, AliPHOSFastRecParticle & rp)
	310	{
b2a60966	311	// Modify the primary particle properties according
	312	// 1. the response function of PHOS
	313	// 2. the performance of the EMC+PPSD setup
	314
b1aa729d	315	Int_t type = MakeType( rp ) ;
a73f33f0	316	rp.SetType(type) ;
	317
	318
	319	// get the detected energy
	320
	321	TLorentzVector momentum ;
	322	rp.Momentum(momentum) ;
	323	Double_t kineticenergy = TMath::Sqrt( TMath::Power(momentum.E(), 2) - TMath::Power(rp.GetMass(), 2) ) ;
	324	Double_t modifiedkineticenergy = MakeEnergy(kineticenergy ) ;
b1aa729d	325	Double_t modifiedenergy = TMath::Sqrt( TMath::Power(modifiedkineticenergy, 2)
	326	+ TMath::Power( rp.GetMass(), 2) ) ;
	327
	328	// get the angle of incidence
	329
	330	Double_t incidencetheta = 90. * TMath::Pi() /180 - rp.Theta() ;
fa7cce36	331	Double_t incidencephi = ( 270 + GetGeometry()->GetPHOSAngle(modid) ) * TMath::Pi() / 180. - rp.Phi() ;
b1aa729d	332
	333	// get the detected direction
	334
	335	TVector3 modifiedposition = MakePosition(kineticenergy, pos, incidencetheta, incidencephi) ;
	336	modifiedposition *= modifiedkineticenergy / modifiedposition.Mag() ;
	337
	338	// Set the modified 4-momentum of the reconstructed particle
	339
	340	rp.SetMomentum(modifiedposition.X(), modifiedposition.Y(), modifiedposition.Z(), modifiedenergy) ;
	341
a73f33f0	342	}
	343
	344	//____________________________________________________________________________
b1aa729d	345	Int_t AliPHOSvFast::MakeType(AliPHOSFastRecParticle & rp )
a73f33f0	346	{
b2a60966	347	// Generate a particle type using the performance of the EMC+PPSD setup
b2a60966	348
9ec91567	349	Int_t rv = AliPHOSFastRecParticle::kUNDEFINED ;
b1aa729d	350	Int_t charge = (Int_t)rp.GetPDG()->Charge() ;
	351	Int_t test ;
	352	Float_t ran ;
f96d3dc7	353	if ( charge != 0 && ( TMath::Abs(rp.GetPdgCode()) != 11 ) )
b1aa729d	354	test = - 1 ;
	355	else
	356	test = rp.GetPdgCode() ;
	357
3a4295ee	358	cout << " SHOULD NOT BE USED until values of probabilities are properly set " << endl ;
3a4295ee	359	assert(1==0) ; // NB: ALL VALUES SHOLD BE CHECKED !!!!
b1aa729d	360	switch (test) {
b1aa729d	361
3a4295ee	362	case 22: // it's a photon // NB: ALL VALUES SHOLD BE CHECKED !!!!
b1aa729d	363	ran = fRan.Rndm() ;
3a4295ee	364	if( ran <= 0.9498 )
	365	rv = AliPHOSFastRecParticle::kNEUTRALHAFAST ;
	366	else
	367	rv = AliPHOSFastRecParticle::kNEUTRALEMFAST ;
b1aa729d	368	break ;
	369
	370	case 2112: // it's a neutron
	371	ran = fRan.Rndm() ;
	372	if ( ran <= 0.9998 )
3a4295ee	373	rv = AliPHOSFastRecParticle::kNEUTRALHASLOW ;
b1aa729d	374	else
3a4295ee	375	rv = AliPHOSFastRecParticle::kNEUTRALEMSLOW ;
b1aa729d	376	break ;
3a4295ee	377
b1aa729d	378	case -2112: // it's a anti-neutron
	379	ran = fRan.Rndm() ;
	380	if ( ran <= 0.9984 )
3a4295ee	381	rv = AliPHOSFastRecParticle::kNEUTRALHASLOW ;
b1aa729d	382	else
3a4295ee	383	rv = AliPHOSFastRecParticle::kNEUTRALEMSLOW ;
b1aa729d	384	break ;
	385
	386	case 11: // it's a electron
	387	ran = fRan.Rndm() ;
	388	if ( ran <= 0.9996 )
3a4295ee	389	rv = AliPHOSFastRecParticle::kCHARGEDEMFAST ;
b1aa729d	390	else
3a4295ee	391	rv = AliPHOSFastRecParticle::kCHARGEDHAFAST ;
b1aa729d	392	break;
b1aa729d	393
f96d3dc7	394	case -11: // it's a positon
b1aa729d	395	ran = fRan.Rndm() ;
b1aa729d	396	if ( ran <= 0.9996 )
3a4295ee	397	rv = AliPHOSFastRecParticle::kCHARGEDEMFAST ;
b1aa729d	398	else
3a4295ee	399	rv = AliPHOSFastRecParticle::kCHARGEDHAFAST ;
b1aa729d	400	break;
	401
	402	case -1: // it's a charged
	403	ran = fRan.Rndm() ;
	404	if ( ran <= 0.9996 )
3a4295ee	405	rv = AliPHOSFastRecParticle::kCHARGEDHAFAST ;
b1aa729d	406	else
3a4295ee	407	rv = AliPHOSFastRecParticle::kNEUTRALHAFAST ;
b1aa729d	408
	409	break ;
	410	}
	411
	412
a73f33f0	413	return rv ;
	414	}
	415
f96d3dc7	416	//___________________________________________________________________________
	417	void AliPHOSvFast::ResetPoints()
	418	{
b2a60966	419	// This overloads the method in AliDetector
b2a60966	420
f96d3dc7	421	ResetFastRecParticles() ;
	422	}
	423
	424	//___________________________________________________________________________
	425	void AliPHOSvFast::ResetFastRecParticles()
	426	{
b2a60966	427	// Resets the list of virtual reconstructed particles
b2a60966	428
f96d3dc7	429	if (fFastRecParticles)
	430	fFastRecParticles->Clear() ;
	431	fNRecParticles = 0 ;
	432	}
	433
3decf5cb	434	//___________________________________________________________________________
	435	void AliPHOSvFast::SetBigBox(Int_t index, Float_t value)
	436	{
b2a60966	437	// Set the size of the Box describing a PHOS module
b2a60966	438
3decf5cb	439	switch (index) {
	440	case 0:
	441	fBigBoxX = value ;
	442	break ;
	443	case 1:
	444	fBigBoxY = value ;
	445	break ;
	446	case 2:
	447	fBigBoxZ = value ;
	448	break ;
	449	}
	450
	451	}
	452
a73f33f0	453	//____________________________________________________________________________
	454	Double_t AliPHOSvFast::SigmaE(Double_t energy)
	455	{
b2a60966	456	// Calculates the energy dependent energy resolution
b2a60966	457
a73f33f0	458	Double_t rv = -1 ;
	459
	460	rv = TMath::Sqrt( TMath::Power(fResPara1/energy, 2)
	461	+ TMath::Power(fResPara2/TMath::Sqrt(energy), 2)
	462	+ TMath::Power(fResPara3, 2) ) ;
	463
	464	return rv * energy ;
	465	}
	466
b1aa729d	467	//____________________________________________________________________________
7a9d98f9	468	Double_t AliPHOSvFast::SigmaP(Double_t energy, Double_t incidence)
b1aa729d	469	{
b2a60966	470	// Calculates the energy dependent position resolution
b2a60966	471
b1aa729d	472	Double_t paraA = fPosParaA0 + fPosParaA1 * incidence ;
	473	Double_t paraB = fPosParaB0 + fPosParaB1 * incidence + fPosParaB2 * incidence * incidence ;
	474
	475	return ( paraA / TMath::Sqrt(energy) + paraB ) * 0.1 ; // in cm
	476	}
	477
3decf5cb	478	//____________________________________________________________________________
	479	void AliPHOSvFast::StepManager(void)
	480	{
b2a60966	481	// Only verifies if the particle reaches PHOS and stops the tracking
3a4295ee	482
3decf5cb	483	Int_t primary = gAlice->GetPrimary( gAlice->CurrentTrack() );
3a4295ee	484
a73f33f0	485	TLorentzVector lv ;
a73f33f0	486	gMC->TrackPosition(lv) ;
b1aa729d	487	TVector3 pos = lv.Vect() ;
	488	Int_t modid ;
	489	gMC->CurrentVolID(modid);
a73f33f0	490
3a4295ee	491	Float_t energy = gMC->Etot() ; //Total energy of current track
3decf5cb	492
3a4295ee	493	//Calculating mass of current particle
	494	TDatabasePDG * pdg = TDatabasePDG::Instance() ;
	495	TParticlePDG * partPDG = pdg->GetParticle(gMC->TrackPid()) ;
	496	Float_t mass = partPDG->Mass() ;
a73f33f0	497
3a4295ee	498	if(energy > mass){
	499	pos.SetMag(TMath::Sqrt(energyenergy-massmass)) ;
	500	TLorentzVector pTrack(pos, energy) ;
a73f33f0	501
3a4295ee	502	TParticle * part = new TParticle(gMC->TrackPid(), 0,-1,-1,-1,-1, pTrack, lv) ;
	503
	504	AliPHOSFastRecParticle rp(*part) ;
	505	rp.SetPrimary(primary) ;
b1aa729d	506
3a4295ee	507	// Adds the response of PHOS to the particle
	508	MakeRecParticle(modid, pos, rp) ;
	509
	510	// add the `track' particle to the FastRecParticles list
b1aa729d	511
3a4295ee	512	AddRecParticle(rp) ;
a73f33f0	513
3a4295ee	514	part->Delete() ;
3a4295ee	515	}
a73f33f0	516	// stop the track as soon PHOS is reached
b1aa729d	517
3decf5cb	518	gMC->StopTrack() ;
	519
	520	}
	521