[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 <TGeometry.h>
#include <TNode.h>
#include <TParticle.h>
#include "TClonesArray.h" 
#include <TVirtualMC.h>

// --- Standard library ---

// --- AliRoot header files ---
#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>
88cb7938	30	#include <TGeometry.h>
	31	#include <TNode.h>
	32	#include <TParticle.h>
e957fea8	33	#include "TClonesArray.h"
88cb7938	34	#include <TVirtualMC.h>
3decf5cb	35
	36	// --- Standard library ---
	37
3decf5cb	38	// --- AliRoot header files ---
3a4295ee	39	#include "AliPHOSFastRecParticle.h"
88cb7938	40	#include "AliPHOSGeometry.h"
88cb7938	41	#include "AliPHOSLoader.h"
3decf5cb	42	#include "AliPHOSvFast.h"
3decf5cb	43	#include "AliRun.h"
3decf5cb	44
	45	ClassImp(AliPHOSvFast)
	46
	47	//____________________________________________________________________________
3a4295ee	48	AliPHOSvFast::AliPHOSvFast() : AliPHOS()
3decf5cb	49	{
3a4295ee	50	// default ctor : initialize data member
	51	fBigBoxX = 0. ;
	52	fBigBoxY = 0. ;
	53	fBigBoxZ = 0. ;
	54	fFastRecParticles = 0 ;
	55	fNRecParticles = 0 ;
	56	fRan = 0 ;
	57	fResPara1 = 0. ;
	58	fResPara2 = 0. ;
	59	fResPara3 = 0. ;
	60	fPosParaA0 = 0. ;
	61	fPosParaA1 = 0. ;
	62	fPosParaB0 = 0. ;
	63	fPosParaB1 = 0. ;
	64	fPosParaB2 = 0. ;
b2a60966	65
3decf5cb	66	}
	67
	68	//____________________________________________________________________________
	69	AliPHOSvFast::AliPHOSvFast(const char name, const char title):
	70	AliPHOS(name,title)
	71	{
b2a60966	72	// ctor
b2a60966	73
3decf5cb	74
88cb7938	75	// create the Loader
7a9d98f9	76
	77	SetBigBox(0, GetGeometry()->GetOuterBoxSize(0) ) ;
	78	SetBigBox(1, GetGeometry()->GetOuterBoxSize(3) + GetGeometry()->GetCPVBoxSize(1) ) ;
	79	SetBigBox(2, GetGeometry()->GetOuterBoxSize(2) );
	80
	81	fNRecParticles = 0 ;
	82	fFastRecParticles = new AliPHOSFastRecParticle::FastRecParticlesList("AliPHOSFastRecParticle", 100) ;
	83
	84	fResPara1 = 0.030 ; // GeV
	85	fResPara2 = 0.00003 ;
	86	fResPara3 = 0.00001 ;
	87
	88	fPosParaA0 = 2.87 ; // mm
	89	fPosParaA1 = -0.0975 ;
	90	fPosParaB0 = 0.257 ;
	91	fPosParaB1 = 0.137 ;
	92	fPosParaB2 = 0.00619 ;
3decf5cb	93	}
	94
	95	//____________________________________________________________________________
	96	AliPHOSvFast::~AliPHOSvFast()
	97	{
b2a60966	98	// dtor
3decf5cb	99
a73f33f0	100	fFastRecParticles->Delete() ;
	101	delete fFastRecParticles ;
	102	fFastRecParticles = 0 ;
3decf5cb	103
	104	}
	105
	106	//____________________________________________________________________________
a73f33f0	107	void AliPHOSvFast::AddRecParticle(const AliPHOSFastRecParticle & rp)
a73f33f0	108	{
b2a60966	109	// Add a virtually reconstructed particle to the list
b2a60966	110
f96d3dc7	111	new( (*fFastRecParticles)[fNRecParticles] ) AliPHOSFastRecParticle(rp) ;
f96d3dc7	112	fNRecParticles++ ;
3decf5cb	113	}
	114
	115	//____________________________________________________________________________
	116	void AliPHOSvFast::BuildGeometry()
	117	{
3decf5cb	118	// Build the PHOS geometry for the ROOT display
b2a60966	119	//BEGIN_HTML
	120	/*
	121	<H2>
	122	PHOS FAST in ALICE displayed by root
	123	</H2>
	124	<H4> All Views </H4>
	125	<P>
	126	<CENTER>
	127	<IMG Align=BOTTOM ALT="Fast All Views" SRC="../images/AliPHOSvFastAllViews.gif">
	128	</CENTER></P>
	129	<H4> Front View </H4>
	130	<P>
	131	<CENTER>
	132	<IMG Align=BOTTOM ALT="Fast Front View" SRC="../images/AliPHOSvFastFrontView.gif">
	133	</CENTER></P>
	134	*/
	135	//END_HTML
	136
3decf5cb	137	const Int_t kColorPHOS = kRed ;
3decf5cb	138
a8c47ab6	139	Double_t const kRADDEG = 180.0 / TMath::Pi() ;
3decf5cb	140
	141	new TBRIK( "BigBox", "PHOS box", "void", GetBigBox(0)/2,
	142	GetBigBox(1)/2,
	143	GetBigBox(2)/2 );
	144
	145	// position PHOS into ALICE
	146
fa7cce36	147	Float_t r = GetGeometry()->GetIPtoCrystalSurface() + GetBigBox(1) / 2.0 ;
3decf5cb	148	Int_t number = 988 ;
fa7cce36	149	Float_t pphi = TMath::ATan( GetBigBox(0) / ( 2.0 * GetGeometry()->GetIPtoCrystalSurface() ) ) ;
3decf5cb	150	pphi *= kRADDEG ;
	151	TNode * top = gAlice->GetGeometry()->GetNode("alice") ;
	152
	153	char * nodename = new char[20] ;
	154	char * rotname = new char[20] ;
	155
fa7cce36	156	for( Int_t i = 1; i <= GetGeometry()->GetNModules(); i++ ) {
fa7cce36	157	Float_t angle = pphi * 2 * ( i - GetGeometry()->GetNModules() / 2.0 - 0.5 ) ;
3decf5cb	158	sprintf(rotname, "%s%d", "rot", number++) ;
	159	new TRotMatrix(rotname, rotname, 90, angle, 90, 90 + angle, 0, 0);
	160	top->cd();
	161	sprintf(nodename,"%s%d", "Module", i) ;
	162	Float_t x = r * TMath::Sin( angle / kRADDEG ) ;
	163	Float_t y = -r * TMath::Cos( angle / kRADDEG ) ;
	164	TNode * bigboxnode = new TNode(nodename, nodename, "BigBox", x, y, 0, rotname ) ;
	165	bigboxnode->SetLineColor(kColorPHOS) ;
	166	fNodes->Add(bigboxnode) ;
	167	}
	168	delete[] nodename ;
	169	delete[] rotname ;
	170	}
	171
	172	//____________________________________________________________________________
	173	void AliPHOSvFast::CreateGeometry()
	174	{
b2a60966	175	// Create the geometry for GEANT
b2a60966	176
3decf5cb	177	AliPHOSvFast phostmp = (AliPHOSvFast)gAlice->GetModule("PHOS") ;
b2a60966	178
3decf5cb	179	if ( phostmp == NULL ) {
	180
	181	fprintf(stderr, "PHOS detector not found!\n") ;
	182	return ;
	183
	184	}
	185
	186	// Get pointer to the array containing media indeces
	187	Int_t *idtmed = fIdtmed->GetArray() - 699 ;
	188
	189	Float_t bigbox[3] ;
	190	bigbox[0] = GetBigBox(0) / 2.0 ;
	191	bigbox[1] = GetBigBox(1) / 2.0 ;
	192	bigbox[2] = GetBigBox(2) / 2.0 ;
	193
	194	gMC->Gsvolu("PHOS", "BOX ", idtmed[798], bigbox, 3) ;
	195
	196	// --- Position PHOS mdules in ALICE setup ---
	197
	198	Int_t idrotm[99] ;
a8c47ab6	199	Double_t const kRADDEG = 180.0 / TMath::Pi() ;
3decf5cb	200
fa7cce36	201	for( Int_t i = 1; i <= GetGeometry()->GetNModules(); i++ ) {
3decf5cb	202
fa7cce36	203	Float_t angle = GetGeometry()->GetPHOSAngle(i) ;
3decf5cb	204	AliMatrix(idrotm[i-1], 90.0, angle, 90.0, 90.0+angle, 0.0, 0.0) ;
3decf5cb	205
fa7cce36	206	Float_t r = GetGeometry()->GetIPtoCrystalSurface() + GetBigBox(1) / 2.0 ;
3decf5cb	207
	208	Float_t xP1 = r * TMath::Sin( angle / kRADDEG ) ;
	209	Float_t yP1 = -r * TMath::Cos( angle / kRADDEG ) ;
3decf5cb	210	gMC->Gspos("PHOS", i, "ALIC", xP1, yP1, 0.0, idrotm[i-1], "ONLY") ;
	211
	212	} // for GetNModules
	213
	214	}
	215
	216
	217	//____________________________________________________________________________
	218	void AliPHOSvFast::Init(void)
	219	{
b2a60966	220	// Prints out an information message
b2a60966	221
3decf5cb	222	Int_t i;
	223
	224	printf("\n");
	225	for(i=0;i<35;i++) printf("*");
	226	printf(" FAST PHOS_INIT ");
	227	for(i=0;i<35;i++) printf("*");
	228	printf("\n");
	229
	230	// Here the PHOS initialisation code (if any!)
	231
	232	for(i=0;i<80;i++) printf("*");
	233	printf("\n");
	234
	235	}
	236
	237	//___________________________________________________________________________
3a4295ee	238	Float_t AliPHOSvFast::GetBigBox(Int_t index) const
3decf5cb	239	{
b2a60966	240	// Get the X, Y or Z dimension of the box describing a PHOS module
b2a60966	241
3decf5cb	242	Float_t rv = 0 ;
	243
	244	switch (index) {
	245	case 0:
	246	rv = fBigBoxX ;
	247	break ;
	248	case 1:
	249	rv = fBigBoxY ;
	250	break ;
	251	case 2:
	252	rv = fBigBoxZ ;
	253	break ;
	254	}
	255	return rv ;
	256	}
3decf5cb	257	//___________________________________________________________________________
88cb7938	258
88cb7938	259	void AliPHOSvFast::MakeBranch(Option_t* opt)
3decf5cb	260	{
b2a60966	261	// Create new branch in the current reconstructed Root Tree
88cb7938	262	AliDetector::MakeBranch(opt);
3a4295ee	263	const char *cd = strstr(opt,"R");
3decf5cb	264
88cb7938	265	if (fFastRecParticles && fLoader->TreeR() && cd) {
88cb7938	266	MakeBranchInTree(fLoader->TreeR(), GetName(), &fFastRecParticles, fBufferSize, 0);
3decf5cb	267	}
3decf5cb	268	}
a73f33f0	269	//____________________________________________________________________________
88cb7938	270
a73f33f0	271	Double_t AliPHOSvFast::MakeEnergy(const Double_t energy)
a73f33f0	272	{
b2a60966	273	// Smears the energy according to the energy dependent energy resolution.
	274	// A gaussian distribution is assumed
	275
b1aa729d	276	Double_t sigma = SigmaE(energy) ;
b1aa729d	277	return fRan.Gaus(energy, sigma) ;
a73f33f0	278	}
a73f33f0	279	//____________________________________________________________________________
88cb7938	280
b1aa729d	281	TVector3 AliPHOSvFast::MakePosition(const Double_t energy, const TVector3 pos, const Double_t theta, const Double_t phi)
a73f33f0	282	{
b2a60966	283	// Smears the impact position according to the energy dependent position resolution
	284	// A gaussian position distribution is assumed
	285
b1aa729d	286	TVector3 newpos ;
	287	Double_t sigma = SigmaP( energy, theta*180./TMath::Pi() ) ;
	288	Double_t x = fRan.Gaus( pos.X(), sigma ) ;
	289	sigma = SigmaP( energy, phi*180./TMath::Pi() ) ;
	290	Double_t z = fRan.Gaus( pos.Z(), sigma ) ;
	291	Double_t y = pos.Y() ;
	292
	293	newpos.SetX(x) ;
	294	newpos.SetY(y) ;
	295	newpos.SetZ(z) ;
	296
	297	return newpos ;
	298	}
a73f33f0	299
b1aa729d	300	//____________________________________________________________________________
	301	void AliPHOSvFast::MakeRecParticle(const Int_t modid, const TVector3 pos, AliPHOSFastRecParticle & rp)
	302	{
b2a60966	303	// Modify the primary particle properties according
	304	// 1. the response function of PHOS
	305	// 2. the performance of the EMC+PPSD setup
	306
b1aa729d	307	Int_t type = MakeType( rp ) ;
a73f33f0	308	rp.SetType(type) ;
	309
	310
	311	// get the detected energy
	312
	313	TLorentzVector momentum ;
	314	rp.Momentum(momentum) ;
	315	Double_t kineticenergy = TMath::Sqrt( TMath::Power(momentum.E(), 2) - TMath::Power(rp.GetMass(), 2) ) ;
	316	Double_t modifiedkineticenergy = MakeEnergy(kineticenergy ) ;
b1aa729d	317	Double_t modifiedenergy = TMath::Sqrt( TMath::Power(modifiedkineticenergy, 2)
	318	+ TMath::Power( rp.GetMass(), 2) ) ;
	319
	320	// get the angle of incidence
	321
	322	Double_t incidencetheta = 90. * TMath::Pi() /180 - rp.Theta() ;
fa7cce36	323	Double_t incidencephi = ( 270 + GetGeometry()->GetPHOSAngle(modid) ) * TMath::Pi() / 180. - rp.Phi() ;
b1aa729d	324
	325	// get the detected direction
	326
	327	TVector3 modifiedposition = MakePosition(kineticenergy, pos, incidencetheta, incidencephi) ;
	328	modifiedposition *= modifiedkineticenergy / modifiedposition.Mag() ;
	329
	330	// Set the modified 4-momentum of the reconstructed particle
	331
	332	rp.SetMomentum(modifiedposition.X(), modifiedposition.Y(), modifiedposition.Z(), modifiedenergy) ;
	333
a73f33f0	334	}
	335
	336	//____________________________________________________________________________
b1aa729d	337	Int_t AliPHOSvFast::MakeType(AliPHOSFastRecParticle & rp )
a73f33f0	338	{
b2a60966	339	// Generate a particle type using the performance of the EMC+PPSD setup
b2a60966	340
9ec91567	341	Int_t rv = AliPHOSFastRecParticle::kUNDEFINED ;
b1aa729d	342	Int_t charge = (Int_t)rp.GetPDG()->Charge() ;
	343	Int_t test ;
	344	Float_t ran ;
f96d3dc7	345	if ( charge != 0 && ( TMath::Abs(rp.GetPdgCode()) != 11 ) )
b1aa729d	346	test = - 1 ;
	347	else
	348	test = rp.GetPdgCode() ;
	349
88cb7938	350	Info("MakeType", "SHOULD NOT BE USED until values of probabilities are properly set ") ;
88cb7938	351	assert(1==0) ; // NB: ALL VALUES SHOULD BE CHECKED !!!!
b1aa729d	352	switch (test) {
b1aa729d	353
3a4295ee	354	case 22: // it's a photon // NB: ALL VALUES SHOLD BE CHECKED !!!!
b1aa729d	355	ran = fRan.Rndm() ;
3a4295ee	356	if( ran <= 0.9498 )
	357	rv = AliPHOSFastRecParticle::kNEUTRALHAFAST ;
	358	else
	359	rv = AliPHOSFastRecParticle::kNEUTRALEMFAST ;
b1aa729d	360	break ;
	361
	362	case 2112: // it's a neutron
	363	ran = fRan.Rndm() ;
	364	if ( ran <= 0.9998 )
3a4295ee	365	rv = AliPHOSFastRecParticle::kNEUTRALHASLOW ;
b1aa729d	366	else
3a4295ee	367	rv = AliPHOSFastRecParticle::kNEUTRALEMSLOW ;
b1aa729d	368	break ;
3a4295ee	369
b1aa729d	370	case -2112: // it's a anti-neutron
	371	ran = fRan.Rndm() ;
	372	if ( ran <= 0.9984 )
3a4295ee	373	rv = AliPHOSFastRecParticle::kNEUTRALHASLOW ;
b1aa729d	374	else
3a4295ee	375	rv = AliPHOSFastRecParticle::kNEUTRALEMSLOW ;
b1aa729d	376	break ;
	377
	378	case 11: // it's a electron
	379	ran = fRan.Rndm() ;
	380	if ( ran <= 0.9996 )
3a4295ee	381	rv = AliPHOSFastRecParticle::kCHARGEDEMFAST ;
b1aa729d	382	else
3a4295ee	383	rv = AliPHOSFastRecParticle::kCHARGEDHAFAST ;
b1aa729d	384	break;
b1aa729d	385
f96d3dc7	386	case -11: // it's a positon
b1aa729d	387	ran = fRan.Rndm() ;
b1aa729d	388	if ( ran <= 0.9996 )
3a4295ee	389	rv = AliPHOSFastRecParticle::kCHARGEDEMFAST ;
b1aa729d	390	else
3a4295ee	391	rv = AliPHOSFastRecParticle::kCHARGEDHAFAST ;
b1aa729d	392	break;
	393
	394	case -1: // it's a charged
	395	ran = fRan.Rndm() ;
	396	if ( ran <= 0.9996 )
3a4295ee	397	rv = AliPHOSFastRecParticle::kCHARGEDHAFAST ;
b1aa729d	398	else
3a4295ee	399	rv = AliPHOSFastRecParticle::kNEUTRALHAFAST ;
b1aa729d	400
	401	break ;
	402	}
	403
	404
a73f33f0	405	return rv ;
	406	}
	407
f96d3dc7	408	//___________________________________________________________________________
	409	void AliPHOSvFast::ResetPoints()
	410	{
b2a60966	411	// This overloads the method in AliDetector
b2a60966	412
f96d3dc7	413	ResetFastRecParticles() ;
	414	}
	415
	416	//___________________________________________________________________________
	417	void AliPHOSvFast::ResetFastRecParticles()
	418	{
b2a60966	419	// Resets the list of virtual reconstructed particles
b2a60966	420
f96d3dc7	421	if (fFastRecParticles)
	422	fFastRecParticles->Clear() ;
	423	fNRecParticles = 0 ;
	424	}
	425
3decf5cb	426	//___________________________________________________________________________
	427	void AliPHOSvFast::SetBigBox(Int_t index, Float_t value)
	428	{
b2a60966	429	// Set the size of the Box describing a PHOS module
b2a60966	430
3decf5cb	431	switch (index) {
	432	case 0:
	433	fBigBoxX = value ;
	434	break ;
	435	case 1:
	436	fBigBoxY = value ;
	437	break ;
	438	case 2:
	439	fBigBoxZ = value ;
	440	break ;
	441	}
	442
	443	}
	444
a73f33f0	445	//____________________________________________________________________________
	446	Double_t AliPHOSvFast::SigmaE(Double_t energy)
	447	{
b2a60966	448	// Calculates the energy dependent energy resolution
b2a60966	449
a73f33f0	450	Double_t rv = -1 ;
	451
	452	rv = TMath::Sqrt( TMath::Power(fResPara1/energy, 2)
	453	+ TMath::Power(fResPara2/TMath::Sqrt(energy), 2)
	454	+ TMath::Power(fResPara3, 2) ) ;
	455
	456	return rv * energy ;
	457	}
	458
b1aa729d	459	//____________________________________________________________________________
7a9d98f9	460	Double_t AliPHOSvFast::SigmaP(Double_t energy, Double_t incidence)
b1aa729d	461	{
b2a60966	462	// Calculates the energy dependent position resolution
b2a60966	463
b1aa729d	464	Double_t paraA = fPosParaA0 + fPosParaA1 * incidence ;
	465	Double_t paraB = fPosParaB0 + fPosParaB1 * incidence + fPosParaB2 * incidence * incidence ;
	466
	467	return ( paraA / TMath::Sqrt(energy) + paraB ) * 0.1 ; // in cm
	468	}
	469
3decf5cb	470	//____________________________________________________________________________
	471	void AliPHOSvFast::StepManager(void)
	472	{
b2a60966	473	// Only verifies if the particle reaches PHOS and stops the tracking
3a4295ee	474
a73f33f0	475	TLorentzVector lv ;
a73f33f0	476	gMC->TrackPosition(lv) ;
b1aa729d	477	TVector3 pos = lv.Vect() ;
	478	Int_t modid ;
	479	gMC->CurrentVolID(modid);
a73f33f0	480
3a4295ee	481	Float_t energy = gMC->Etot() ; //Total energy of current track
3decf5cb	482
3a4295ee	483	//Calculating mass of current particle
	484	TDatabasePDG * pdg = TDatabasePDG::Instance() ;
	485	TParticlePDG * partPDG = pdg->GetParticle(gMC->TrackPid()) ;
	486	Float_t mass = partPDG->Mass() ;
a73f33f0	487
3a4295ee	488	if(energy > mass){
	489	pos.SetMag(TMath::Sqrt(energyenergy-massmass)) ;
	490	TLorentzVector pTrack(pos, energy) ;
a73f33f0	491
3a4295ee	492	TParticle * part = new TParticle(gMC->TrackPid(), 0,-1,-1,-1,-1, pTrack, lv) ;
	493
	494	AliPHOSFastRecParticle rp(*part) ;
b1aa729d	495
3a4295ee	496	// Adds the response of PHOS to the particle
	497	MakeRecParticle(modid, pos, rp) ;
	498
	499	// add the `track' particle to the FastRecParticles list
b1aa729d	500
3a4295ee	501	AddRecParticle(rp) ;
a73f33f0	502
3a4295ee	503	part->Delete() ;
3a4295ee	504	}
a73f33f0	505	// stop the track as soon PHOS is reached
b1aa729d	506
3decf5cb	507	gMC->StopTrack() ;
	508
	509	}
	510