[u/mrichter/AliRoot.git] / MUON / AliMUONv1.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 purpeateose. It is      *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/

/* $Id$ */

//-----------------------------------------------------------------------------
// Class AliMUONv1
// --------------------
// AliDetector class for MUON subsystem which implements
// functions for simulation 
//-----------------------------------------------------------------------------

#include "AliMUONv1.h"
#include "AliMUONConstants.h"
#include "AliMUONResponseFactory.h"
#include "AliMUONHit.h"
#include "AliMUONGeometryBuilder.h"	
#include "AliMUONGeometry.h"	
#include "AliMUONGeometryTransformer.h"	
#include "AliMUONGeometryModule.h"	
#include "AliMUONStringIntMap.h"	
#include "AliMUONGeometryDetElement.h"	

#include "AliMpCDB.h"
#include "AliMpDEManager.h"

#include "AliConst.h" 
#include "AliMagF.h"
#include "AliRun.h"
#include "AliMC.h"
#include "AliTrackReference.h"
#include "AliLog.h"

#include <TClonesArray.h>
#include <TF1.h>
#include <TF2.h>
#include <TGeoGlobalMagField.h>
#include <TGeoMatrix.h>
#include <TRandom.h>
#include <TRandom.h> 
#include <TVirtualMC.h>

#include <string>

#include "AliMUONVHitStore.h"

/// \cond CLASSIMP
ClassImp(AliMUONv1)
/// \endcond
 
//___________________________________________
AliMUONv1::AliMUONv1() 
  : AliMUON(),
    fAngleEffect(kTRUE),
    fMagEffect(kTRUE),
    fStepMaxInActiveGas(0.6),
    fStepSum(0x0),
    fDestepSum(0x0),
    fTrackMomentum(), 
    fTrackPosition(),
    fElossRatio(0x0),
    fAngleEffect10(0x0),
    fAngleEffectNorma(0x0),
    fMagAngleEffectNorma(0x0)
{
/// Default constructor
  
  AliDebug(1,Form("default (empty) ctor this=%p",this));
} 

//___________________________________________
AliMUONv1::AliMUONv1(const char *name, const char* title)
: AliMUON(name, title), 
    fAngleEffect(kTRUE),
    fMagEffect(kTRUE),
    fStepMaxInActiveGas(0.6),
    fStepSum(0x0),
    fDestepSum(0x0),
    fTrackMomentum(), 
    fTrackPosition(),
    fElossRatio(0x0),
    fAngleEffect10(0x0),
    fAngleEffectNorma(0x0),
    fMagAngleEffectNorma(0x0)
{
/// Standard onstructor

    AliDebug(1,Form("ctor this=%p",this));	
	
    // Load mapping
    if ( ! AliMpCDB::LoadMpSegmentation() ) {
      AliFatal("Could not access mapping from OCDB !");
    }
       
    // By default include all stations

    fStepSum   = new Float_t [AliMUONConstants::NCh()];
    fDestepSum = new Float_t [AliMUONConstants::NCh()];
    for (Int_t i=0; i<AliMUONConstants::NCh(); i++) {
      fStepSum[i] =0.0;
      fDestepSum[i]=0.0;
    }
    // Ratio of particle mean eloss with respect MIP's Khalil Boudjemline, sep 2003, PhD.Thesis and Particle Data Book
    fElossRatio = new TF1("ElossRatio","[0]+[1]*x+[2]*x*x+[3]*x*x*x+[4]*x*x*x*x",0.5,5.); 
    fElossRatio->SetParameter(0,1.02138);
    fElossRatio->SetParameter(1,-9.54149e-02);
    fElossRatio->SetParameter(2,+7.83433e-02); 
    fElossRatio->SetParameter(3,-9.98208e-03);
    fElossRatio->SetParameter(4,+3.83279e-04);

    // Angle effect in tracking chambers at theta =10 degres as a function of ElossRatio (Khalil BOUDJEMLINE sep 2003 Ph.D Thesis) (in micrometers)
    fAngleEffect10 = new TF1("AngleEffect10","[0]+[1]*x+[2]*x*x",0.5,3.0);
    fAngleEffect10->SetParameter(0, 1.90691e+02);
    fAngleEffect10->SetParameter(1,-6.62258e+01);
    fAngleEffect10->SetParameter(2,+1.28247e+01);
    // Angle effect: Normalisation form theta=10 degres to theta between 0 and 10 (Khalil BOUDJEMLINE sep 2003 Ph.D Thesis)  
    // Angle with respect to the wires assuming that chambers are perpendicular to the z axis.
    fAngleEffectNorma = new TF1("AngleEffectNorma","[0]+[1]*x+[2]*x*x+[3]*x*x*x",0.0,10.0);
    fAngleEffectNorma->SetParameter(0,4.148);
    fAngleEffectNorma->SetParameter(1,-6.809e-01);
    fAngleEffectNorma->SetParameter(2,5.151e-02);
    fAngleEffectNorma->SetParameter(3,-1.490e-03);

    // Magnetic field effect: Normalisation form theta=16 degres (eq. 10 degrees B=0) to theta between -20 and 20 (Lamia Benhabib jun 2006 )  
    // Angle with respect to the wires assuming that chambers are perpendicular to the z axis.
    fMagAngleEffectNorma = new TF2("MagAngleEffectNorma","121.24/(([1]+[2]*abs(y))+[3]*abs(x-[0]*y)+[4]*abs((x-[0]*y)*(x-[0]*y))+[5]*abs((x-[0]*y)*(x-[0]*y)*(x-[0]*y))+[6]*abs((x-[0]*y)*(x-[0]*y)*(x-[0]*y)*(x-[0]*y)))",-20.0,20.0,-1.,1.);
    fMagAngleEffectNorma->SetParameters(8.6995, 25.4022, 13.8822, 2.4717, 1.1551, -0.0624, 0.0012);
}

//___________________________________________
AliMUONv1::~AliMUONv1()
{
/// Destructor
  
  AliDebug(1,Form("dtor this=%p",this));
  delete [] fStepSum;
  delete [] fDestepSum;
  delete fElossRatio;
  delete fAngleEffect10;
  delete fAngleEffectNorma; 
  delete fMagAngleEffectNorma;
}

//__________________________________________________
void AliMUONv1::CreateGeometry()
{
/// Construct geometry using geometry builder

  fGeometryBuilder->CreateGeometry();
}

//________________________________________________________________
void AliMUONv1::CreateMaterials()
{
/// Construct materials using geometry builder

  fGeometryBuilder->CreateMaterials();
}

//________________________________________________________________
void AliMUONv1::UpdateInternalGeometry()
{
/// Update geometry after applying mis-alignment

  // Load mapping
  if ( ! AliMpCDB::LoadMpSegmentation() ) {
    AliFatal("Could not access mapping from OCDB !");
  }

  fGeometryBuilder->UpdateInternalGeometry();
}

//________________________________________________________________
void AliMUONv1::AddAlignableVolumes() const
{
/// Construct materials using geometry builder

  GetGeometryTransformer()->AddAlignableVolumes();
}


//___________________________________________
void AliMUONv1::Init()
{ 
/// Initialize geometry

  AliDebug(1,"Start Init for version 1 - CPC chamber type");
   
  fGeometryBuilder->InitGeometry();
  AliDebug(1,"Finished Init for version 1 - CPC chamber type");   
 

  // Build segmentation
  // using geometry parametrisation
  //
  // Build response
  //
  AliMUONResponseFactory respFactory("default", fIsTailEffect);
  respFactory.Build(this);
  
}

//__________________________________________________________________
Int_t  AliMUONv1::GetGeomModuleId(Int_t volId) const
{
/// Check if the volume with specified  volId is a sensitive volume (gas) 
/// of some chamber and return the chamber number;
/// if not sensitive volume - return 0.

  for (Int_t i = 0; i < AliMUONConstants::NGeomModules(); i++) {
    if ( GetGeometry()->GetModule(i)->IsSensitiveVolume(volId) )
      return i;
  }    

  return -1;
}

//_______________________________________________________________________________
TString  AliMUONv1::CurrentVolumePath() const
{
/// Return current volume path
/// (Could be removed when this function is available via gMC)

  TString path = "";
  TString name;
  Int_t copyNo;
  Int_t imother = 0;
  do {
    name = gMC->CurrentVolOffName(imother);
    gMC->CurrentVolOffID(imother++, copyNo);
    TString add = "/";
    add += name;
    add += "_";
    add += copyNo;
    path.Insert(0,add); 
  }
  while ( name != TString("ALIC") );
  
  return path;  
}

//_______________________________________________________________________________
void AliMUONv1::StepManager()
{
/// Step manager for the chambers

  // Only charged tracks
  if( !(gMC->TrackCharge()) ) return; 
  // Only charged tracks
  
  // Only gas gap inside chamber
  // Tag chambers and record hits when track enters 
  static Int_t   idvol=-1, iEnter = 0;
  Int_t   copy;
  const  Float_t kBig = 1.e10;
  static Double_t xyzEnter[3];

  //
  // Only gas gap inside chamber
  // Tag chambers and record hits when track enters 
  Int_t id=gMC->CurrentVolID(copy);
  Int_t iGeomModule = GetGeomModuleId(id);
  if (iGeomModule == -1) return;

  // Detection elements id
  const AliMUONGeometryModule* kGeometryModule
    = GetGeometry()->GetModule(iGeomModule);
  AliMUONGeometryDetElement* detElement
    = kGeometryModule->FindBySensitiveVolume(CurrentVolumePath());
    
  if (!detElement && iGeomModule < AliMUONConstants::NGeomModules()-2) {
    iGeomModule++;
    const AliMUONGeometryModule* kGeometryModule2
      = GetGeometry()->GetModule(iGeomModule);
    detElement 
      = kGeometryModule2->FindBySensitiveVolume(CurrentVolumePath());
  }    

  Int_t detElemId = 0;
  if (detElement) detElemId = detElement->GetUniqueID(); 
 
  if (!detElemId) {
    AliErrorStream() 
         << "Geometry module id: "
  	 << setw(3) << iGeomModule << "  "
  	 << "Current SV: " 
  	 <<  CurrentVolumePath() 
         << "  detElemId: "
  	 << setw(5) << detElemId 
         << endl;
    Double_t x, y, z;
    gMC->TrackPosition(x, y, z);	 
    AliErrorStream() 
         << "	global position: "
  	 << x << ", " << y << ", " << z
  	 << endl;
    AliErrorStream() << "DetElemId not identified." << endl;
  } 
  
  Int_t iChamber = AliMpDEManager::GetChamberId(detElemId) + 1; 
  idvol = iChamber -1;
    
  // Filling TrackRefs file for MUON. Our Track references are the active volume of the chambers
  if ( (gMC->IsTrackEntering() || gMC->IsTrackExiting() ) ) {
    AliTrackReference* trackReference    
      = AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber(), AliTrackReference::kMUON);
    trackReference->SetUserId(detElemId);
  }  
  
  if( gMC->IsTrackEntering() ) {
     Float_t theta = fTrackMomentum.Theta();
     if ((TMath::Pi()-theta)*kRaddeg>=15.) gMC->SetMaxStep(fStepMaxInActiveGas); // We use Pi-theta because z is negative
     iEnter = 1;
     gMC->TrackPosition(xyzEnter[0], xyzEnter[1], xyzEnter[2]); // save coordinates of entrance point
  }

   //   AliDebug(1,
   //	    Form("Active volume found %d chamber %d Z chamber is %f ",idvol,iChamber,
   //		 ( (AliMUONChamber*)(*fChambers)[idvol])->Z())) ;
  // Particule id and mass, 
  Int_t     ipart = gMC->TrackPid();
  Float_t   mass  = gMC->TrackMass();

  fDestepSum[idvol]+=gMC->Edep();
  // Get current particle id (ipart), track position (pos)  and momentum (mom)
  if ( fStepSum[idvol]==0.0 )  gMC->TrackMomentum(fTrackMomentum);
  fStepSum[idvol]+=gMC->TrackStep();
  
  //  if (AliDebugLevel()) {
  //   AliDebug(1,Form("Step, iChamber %d, Particle %d, theta %f phi %f mass %f StepSum %f eloss %g",
  //		     iChamber,ipart, fTrackMomentum.Theta()*kRaddeg, fTrackMomentum.Phi()*kRaddeg,
  //	     mass, fStepSum[idvol], gMC->Edep()));
  // AliDebug(1,Form("Step:Track Momentum %f %f %f", fTrackMomentum.X(), fTrackMomentum.Y(), 
  //	     fTrackMomentum.Z()));
  // gMC->TrackPosition(fTrackPosition);
  // AliDebug(1,Form("Step: Track Position %f %f %f",fTrackPosition.X(),
  //	     fTrackPosition.Y(),fTrackPosition.Z())) ;
  //}

  // Track left chamber or StepSum larger than fStepMaxInActiveGas
  if ( gMC->IsTrackExiting() || 
       gMC->IsTrackStop() || 
       gMC->IsTrackDisappeared()||
       (fStepSum[idvol]>fStepMaxInActiveGas) ) {
    
    if   ( gMC->IsTrackExiting() || 
           gMC->IsTrackStop() || 
           gMC->IsTrackDisappeared() ) gMC->SetMaxStep(kBig);
    if (fDestepSum[idvol] == 0) {
      // AZ - no energy release
      fStepSum[idvol] = 0; // Reset for the next event
      iEnter = 0;
      return; 
    }

    gMC->TrackPosition(fTrackPosition);
    Float_t theta = fTrackMomentum.Theta();
    Float_t phi   = fTrackMomentum.Phi();
    
    Int_t merge = 0;
    Double_t xyz0[3]={0}, xyz1[3]={0}, tmp[3]={0};
    if (gMC->IsTrackExiting() && iEnter != 0) {
      // AZ - this code is to avoid artificial hit splitting at the
      // "fake" boundary inside the same chamber. It will still produce 
      // 2 hits but with the same coordinates (at the wire) to allow 
      // their merging at the digitization level.

      // Only for a track going from the entrance to the exit from the volume
      // Get local coordinates
      gMC->Gmtod(xyzEnter, xyz0, 1); // local coord. at the entrance

      fTrackPosition.Vect().GetXYZ(tmp);
      gMC->Gmtod(tmp, xyz1, 1); // local coord. at the exit
      Float_t dx = xyz0[0] - xyz1[0];
      Float_t dy = xyz0[1] - xyz1[1];
      Float_t thLoc = TMath::ATan2 (TMath::Sqrt(dx*dx+dy*dy), TMath::Abs(xyz0[2]-xyz1[2]));
      if (thLoc * TMath::RadToDeg() < 15) merge = 1; 
    }

    if (merge) {
      Double_t dz = -0.5;
      if (xyz1[2] != xyz0[2]) dz = xyz0[2] / (xyz1[2] - xyz0[2]);
      tmp[0] = xyz0[0] - (xyz1[0] - xyz0[0]) * dz; // local coord. at the wire
      tmp[1] = xyz0[1] - (xyz1[1] - xyz0[1]) * dz;
      tmp[2] = xyz0[2] - (xyz1[2] - xyz0[2]) * dz;
      gMC->Gdtom(tmp, xyz1, 1); // global coord. at the wire
      fTrackPosition.SetXYZT(xyz1[0], xyz1[1], xyz1[2], fTrackPosition.T());
    } else {
      TLorentzVector backToWire( fStepSum[idvol]/2.*sin(theta)*cos(phi),
				 fStepSum[idvol]/2.*sin(theta)*sin(phi),
				 fStepSum[idvol]/2.*cos(theta),0.0       );
      fTrackPosition-=backToWire;
      //printf(" %d %d %d %f %d \n", gMC->IsTrackExiting(), gMC->IsTrackStop(), gMC->IsTrackDisappeared(), fStepSum[idvol], iEnter);
      //    AliDebug(1,
      //     Form("Track Position %f %f %f",fTrackPosition.X(),fTrackPosition.Y(),fTrackPosition.Z()));
      // AliDebug(1,
      //     Form("Exit: Track backToWire %f %f %f",backToWire.X(),backToWire.Y(),backToWire.Z())) ;
    }
    
    //-------------- Angle effect 
    // Ratio between energy loss of particle and Mip as a function of BetaGamma of particle (Energy/Mass)
    
    Float_t betaxGamma    = fTrackMomentum.P()/mass;//  pc/mc2
    Float_t sigmaEffect10degrees;
    Float_t sigmaEffectThetadegrees;
    Float_t eLossParticleELossMip;
    Float_t yAngleEffect=0.;
    Float_t thetawires      =  TMath::ASin( TMath::Sin(TMath::Pi()-theta) * TMath::Sin(phi) ) ;// We use Pi-theta because z is negative
    Double_t bField[3] = {0};
    fTrackPosition.Vect().GetXYZ(tmp);
    TGeoGlobalMagField::Instance()->Field(tmp,bField);

    if (fAngleEffect && !fMagEffect){
      thetawires = TMath::Abs(thetawires);
    if ( (betaxGamma >3.2)   &&  (thetawires*kRaddeg<=15.) ) {
      betaxGamma=TMath::Log(betaxGamma);
      eLossParticleELossMip = fElossRatio->Eval(betaxGamma);
      // 10 degrees is a reference for a model (arbitrary)
      sigmaEffect10degrees=fAngleEffect10->Eval(eLossParticleELossMip);// in micrometers
      // Angle with respect to the wires assuming that chambers are perpendicular to the z axis.
      sigmaEffectThetadegrees =  sigmaEffect10degrees/fAngleEffectNorma->Eval(thetawires*kRaddeg);  // For 5mm gap  
      if ( (iChamber==1)  ||  (iChamber==2) )  
        sigmaEffectThetadegrees/=(1.09833e+00+1.70000e-02*(thetawires*kRaddeg)); // The gap is different (4mm)
      yAngleEffect=1.e-04*gRandom->Gaus(0,sigmaEffectThetadegrees); // Error due to the angle effect in cm
    }
    }
    else if (fAngleEffect && fMagEffect) {
      if ( (betaxGamma >3.2)   &&  (TMath::Abs(thetawires*kRaddeg)<=15.) ) {
	betaxGamma=TMath::Log(betaxGamma);
	eLossParticleELossMip = fElossRatio->Eval(betaxGamma);
	// 10 degrees is a reference for a model (arbitrary)
	sigmaEffect10degrees=fAngleEffect10->Eval(eLossParticleELossMip);// in micrometers
	// Angle with respect to the wires assuming that chambers are perpendicular to the z axis.
	sigmaEffectThetadegrees =  sigmaEffect10degrees/fMagAngleEffectNorma->Eval(thetawires*kRaddeg,bField[0]/10.);  // For 5mm gap  
      if ( (iChamber==1)  ||  (iChamber==2) )  
        sigmaEffectThetadegrees/=(1.09833e+00+1.70000e-02*(thetawires*kRaddeg)); // The gap is different (4mm)
	yAngleEffect=1.e-04*gRandom->Gaus(0,sigmaEffectThetadegrees); // Error due to the angle effect in cm
      }
    }

    AliMUONHit hit(fIshunt, 
		   gAlice->GetMCApp()->GetCurrentTrackNumber(), 
		   detElemId, ipart,
		   fTrackPosition.X(), 
		   fTrackPosition.Y()+yAngleEffect, 
		   fTrackPosition.Z(), 
		   gMC->TrackTime(),
		   fTrackMomentum.P(),
		   theta, 
		   phi, 
		   fStepSum[idvol], 
		   fDestepSum[idvol],                        
		   fTrackPosition.X(),
		   fTrackPosition.Y(),
		   fTrackPosition.Z());
    
    fHitStore->Add(hit);

    fStepSum[idvol]  =0; // Reset for the next event
    fDestepSum[idvol]=0; // Reset for the next event
    iEnter = 0;
  }
}
Commit	Line	Data
	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 purpeateose. It is *
	13	* provided "as is" without express or implied warranty. *
	14	**************************************************************************/
	15
	16	/* $Id$ */
	17
	18	//-----------------------------------------------------------------------------
	19	// Class AliMUONv1
	20	// --------------------
	21	// AliDetector class for MUON subsystem which implements
	22	// functions for simulation
	23	//-----------------------------------------------------------------------------
	24
	25	#include "AliMUONv1.h"
	26	#include "AliMUONConstants.h"
	27	#include "AliMUONResponseFactory.h"
	28	#include "AliMUONHit.h"
	29	#include "AliMUONGeometryBuilder.h"
	30	#include "AliMUONGeometry.h"
	31	#include "AliMUONGeometryTransformer.h"
	32	#include "AliMUONGeometryModule.h"
	33	#include "AliMUONStringIntMap.h"
	34	#include "AliMUONGeometryDetElement.h"
	35
	36	#include "AliMpCDB.h"
	37	#include "AliMpDEManager.h"
	38
	39	#include "AliConst.h"
	40	#include "AliMagF.h"
	41	#include "AliRun.h"
	42	#include "AliMC.h"
	43	#include "AliTrackReference.h"
	44	#include "AliLog.h"
	45
	46	#include <TClonesArray.h>
	47	#include <TF1.h>
	48	#include <TF2.h>
	49	#include <TGeoGlobalMagField.h>
	50	#include <TGeoMatrix.h>
	51	#include <TRandom.h>
	52	#include <TRandom.h>
	53	#include <TVirtualMC.h>
	54
	55	#include <string>
	56
	57	#include "AliMUONVHitStore.h"
	58
	59	/// \cond CLASSIMP
	60	ClassImp(AliMUONv1)
	61	/// \endcond
	62
	63	//___________________________________________
	64	AliMUONv1::AliMUONv1()
	65	: AliMUON(),
	66	fAngleEffect(kTRUE),
	67	fMagEffect(kTRUE),
	68	fStepMaxInActiveGas(0.6),
	69	fStepSum(0x0),
	70	fDestepSum(0x0),
	71	fTrackMomentum(),
	72	fTrackPosition(),
	73	fElossRatio(0x0),
	74	fAngleEffect10(0x0),
	75	fAngleEffectNorma(0x0),
	76	fMagAngleEffectNorma(0x0)
	77	{
	78	/// Default constructor
	79
	80	AliDebug(1,Form("default (empty) ctor this=%p",this));
	81	}
	82
	83	//___________________________________________
	84	AliMUONv1::AliMUONv1(const char name, const char title)
	85	: AliMUON(name, title),
	86	fAngleEffect(kTRUE),
	87	fMagEffect(kTRUE),
	88	fStepMaxInActiveGas(0.6),
	89	fStepSum(0x0),
	90	fDestepSum(0x0),
	91	fTrackMomentum(),
	92	fTrackPosition(),
	93	fElossRatio(0x0),
	94	fAngleEffect10(0x0),
	95	fAngleEffectNorma(0x0),
	96	fMagAngleEffectNorma(0x0)
	97	{
	98	/// Standard onstructor
	99
	100	AliDebug(1,Form("ctor this=%p",this));
	101
	102	// Load mapping
	103	if ( ! AliMpCDB::LoadMpSegmentation() ) {
	104	AliFatal("Could not access mapping from OCDB !");
	105	}
	106
	107	// By default include all stations
	108
	109	fStepSum = new Float_t [AliMUONConstants::NCh()];
	110	fDestepSum = new Float_t [AliMUONConstants::NCh()];
	111	for (Int_t i=0; i<AliMUONConstants::NCh(); i++) {
	112	fStepSum[i] =0.0;
	113	fDestepSum[i]=0.0;
	114	}
	115	// Ratio of particle mean eloss with respect MIP's Khalil Boudjemline, sep 2003, PhD.Thesis and Particle Data Book
	116	fElossRatio = new TF1("ElossRatio","[0]+[1]x+[2]xx+[3]xxx+[4]xxxx",0.5,5.);
	117	fElossRatio->SetParameter(0,1.02138);
	118	fElossRatio->SetParameter(1,-9.54149e-02);
	119	fElossRatio->SetParameter(2,+7.83433e-02);
	120	fElossRatio->SetParameter(3,-9.98208e-03);
	121	fElossRatio->SetParameter(4,+3.83279e-04);
	122
	123	// Angle effect in tracking chambers at theta =10 degres as a function of ElossRatio (Khalil BOUDJEMLINE sep 2003 Ph.D Thesis) (in micrometers)
	124	fAngleEffect10 = new TF1("AngleEffect10","[0]+[1]x+[2]x*x",0.5,3.0);
	125	fAngleEffect10->SetParameter(0, 1.90691e+02);
	126	fAngleEffect10->SetParameter(1,-6.62258e+01);
	127	fAngleEffect10->SetParameter(2,+1.28247e+01);
	128	// Angle effect: Normalisation form theta=10 degres to theta between 0 and 10 (Khalil BOUDJEMLINE sep 2003 Ph.D Thesis)
	129	// Angle with respect to the wires assuming that chambers are perpendicular to the z axis.
	130	fAngleEffectNorma = new TF1("AngleEffectNorma","[0]+[1]x+[2]xx+[3]xxx",0.0,10.0);
	131	fAngleEffectNorma->SetParameter(0,4.148);
	132	fAngleEffectNorma->SetParameter(1,-6.809e-01);
	133	fAngleEffectNorma->SetParameter(2,5.151e-02);
	134	fAngleEffectNorma->SetParameter(3,-1.490e-03);
	135
	136	// Magnetic field effect: Normalisation form theta=16 degres (eq. 10 degrees B=0) to theta between -20 and 20 (Lamia Benhabib jun 2006 )
	137	// Angle with respect to the wires assuming that chambers are perpendicular to the z axis.
	138	fMagAngleEffectNorma = new TF2("MagAngleEffectNorma","121.24/(([1]+[2]abs(y))+[3]abs(x-[0]y)+[4]abs((x-[0]y)(x-[0]y))+[5]abs((x-[0]y)(x-[0]y)(x-[0]y))+[6]abs((x-[0]y)(x-[0]y)(x-[0]y)(x-[0]*y)))",-20.0,20.0,-1.,1.);
	139	fMagAngleEffectNorma->SetParameters(8.6995, 25.4022, 13.8822, 2.4717, 1.1551, -0.0624, 0.0012);
	140	}
	141
	142	//___________________________________________
	143	AliMUONv1::~AliMUONv1()
	144	{
	145	/// Destructor
	146
	147	AliDebug(1,Form("dtor this=%p",this));
	148	delete [] fStepSum;
	149	delete [] fDestepSum;
	150	delete fElossRatio;
	151	delete fAngleEffect10;
	152	delete fAngleEffectNorma;
	153	delete fMagAngleEffectNorma;
	154	}
	155
	156	//__________________________________________________
	157	void AliMUONv1::CreateGeometry()
	158	{
	159	/// Construct geometry using geometry builder
	160
	161	fGeometryBuilder->CreateGeometry();
	162	}
	163
	164	//________________________________________________________________
	165	void AliMUONv1::CreateMaterials()
	166	{
	167	/// Construct materials using geometry builder
	168
	169	fGeometryBuilder->CreateMaterials();
	170	}
	171
	172	//________________________________________________________________
	173	void AliMUONv1::UpdateInternalGeometry()
	174	{
	175	/// Update geometry after applying mis-alignment
	176
	177	// Load mapping
	178	if ( ! AliMpCDB::LoadMpSegmentation() ) {
	179	AliFatal("Could not access mapping from OCDB !");
	180	}
	181
	182	fGeometryBuilder->UpdateInternalGeometry();
	183	}
	184
	185	//________________________________________________________________
	186	void AliMUONv1::AddAlignableVolumes() const
	187	{
	188	/// Construct materials using geometry builder
	189
	190	GetGeometryTransformer()->AddAlignableVolumes();
	191	}
	192
	193
	194	//___________________________________________
	195	void AliMUONv1::Init()
	196	{
	197	/// Initialize geometry
	198
	199	AliDebug(1,"Start Init for version 1 - CPC chamber type");
	200
	201	fGeometryBuilder->InitGeometry();
	202	AliDebug(1,"Finished Init for version 1 - CPC chamber type");
	203
	204
	205	// Build segmentation
	206	// using geometry parametrisation
	207	//
	208	// Build response
	209	//
	210	AliMUONResponseFactory respFactory("default", fIsTailEffect);
	211	respFactory.Build(this);
	212
	213	}
	214
	215	//__________________________________________________________________
	216	Int_t AliMUONv1::GetGeomModuleId(Int_t volId) const
	217	{
	218	/// Check if the volume with specified volId is a sensitive volume (gas)
	219	/// of some chamber and return the chamber number;
	220	/// if not sensitive volume - return 0.
	221
	222	for (Int_t i = 0; i < AliMUONConstants::NGeomModules(); i++) {
	223	if ( GetGeometry()->GetModule(i)->IsSensitiveVolume(volId) )
	224	return i;
	225	}
	226
	227	return -1;
	228	}
	229
	230	//_______________________________________________________________________________
	231	TString AliMUONv1::CurrentVolumePath() const
	232	{
	233	/// Return current volume path
	234	/// (Could be removed when this function is available via gMC)
	235
	236	TString path = "";
	237	TString name;
	238	Int_t copyNo;
	239	Int_t imother = 0;
	240	do {
	241	name = gMC->CurrentVolOffName(imother);
	242	gMC->CurrentVolOffID(imother++, copyNo);
	243	TString add = "/";
	244	add += name;
	245	add += "_";
	246	add += copyNo;
	247	path.Insert(0,add);
	248	}
	249	while ( name != TString("ALIC") );
	250
	251	return path;
	252	}
	253
	254	//_______________________________________________________________________________
	255	void AliMUONv1::StepManager()
	256	{
	257	/// Step manager for the chambers
	258
	259	// Only charged tracks
	260	if( !(gMC->TrackCharge()) ) return;
	261	// Only charged tracks
	262
	263	// Only gas gap inside chamber
	264	// Tag chambers and record hits when track enters
	265	static Int_t idvol=-1, iEnter = 0;
	266	Int_t copy;
	267	const Float_t kBig = 1.e10;
	268	static Double_t xyzEnter[3];
	269
	270	//
	271	// Only gas gap inside chamber
	272	// Tag chambers and record hits when track enters
	273	Int_t id=gMC->CurrentVolID(copy);
	274	Int_t iGeomModule = GetGeomModuleId(id);
	275	if (iGeomModule == -1) return;
	276
	277	// Detection elements id
	278	const AliMUONGeometryModule* kGeometryModule
	279	= GetGeometry()->GetModule(iGeomModule);
	280	AliMUONGeometryDetElement* detElement
	281	= kGeometryModule->FindBySensitiveVolume(CurrentVolumePath());
	282
	283	if (!detElement && iGeomModule < AliMUONConstants::NGeomModules()-2) {
	284	iGeomModule++;
	285	const AliMUONGeometryModule* kGeometryModule2
	286	= GetGeometry()->GetModule(iGeomModule);
	287	detElement
	288	= kGeometryModule2->FindBySensitiveVolume(CurrentVolumePath());
	289	}
	290
	291	Int_t detElemId = 0;
	292	if (detElement) detElemId = detElement->GetUniqueID();
	293
	294	if (!detElemId) {
	295	AliErrorStream()
	296	<< "Geometry module id: "
	297	<< setw(3) << iGeomModule << " "
	298	<< "Current SV: "
	299	<< CurrentVolumePath()
	300	<< " detElemId: "
	301	<< setw(5) << detElemId
	302	<< endl;
	303	Double_t x, y, z;
	304	gMC->TrackPosition(x, y, z);
	305	AliErrorStream()
	306	<< " global position: "
	307	<< x << ", " << y << ", " << z
	308	<< endl;
	309	AliErrorStream() << "DetElemId not identified." << endl;
	310	}
	311
	312	Int_t iChamber = AliMpDEManager::GetChamberId(detElemId) + 1;
	313	idvol = iChamber -1;
	314
	315	// Filling TrackRefs file for MUON. Our Track references are the active volume of the chambers
	316	if ( (gMC->IsTrackEntering() \|\| gMC->IsTrackExiting() ) ) {
	317	AliTrackReference* trackReference
	318	= AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber(), AliTrackReference::kMUON);
	319	trackReference->SetUserId(detElemId);
	320	}
	321
	322	if( gMC->IsTrackEntering() ) {
	323	Float_t theta = fTrackMomentum.Theta();
	324	if ((TMath::Pi()-theta)*kRaddeg>=15.) gMC->SetMaxStep(fStepMaxInActiveGas); // We use Pi-theta because z is negative
	325	iEnter = 1;
	326	gMC->TrackPosition(xyzEnter[0], xyzEnter[1], xyzEnter[2]); // save coordinates of entrance point
	327	}
	328
	329	// AliDebug(1,
	330	// Form("Active volume found %d chamber %d Z chamber is %f ",idvol,iChamber,
	331	// ( (AliMUONChamber)(fChambers)[idvol])->Z())) ;
	332	// Particule id and mass,
	333	Int_t ipart = gMC->TrackPid();
	334	Float_t mass = gMC->TrackMass();
	335
	336	fDestepSum[idvol]+=gMC->Edep();
	337	// Get current particle id (ipart), track position (pos) and momentum (mom)
	338	if ( fStepSum[idvol]==0.0 ) gMC->TrackMomentum(fTrackMomentum);
	339	fStepSum[idvol]+=gMC->TrackStep();
	340
	341	// if (AliDebugLevel()) {
	342	// AliDebug(1,Form("Step, iChamber %d, Particle %d, theta %f phi %f mass %f StepSum %f eloss %g",
	343	// iChamber,ipart, fTrackMomentum.Theta()kRaddeg, fTrackMomentum.Phi()kRaddeg,
	344	// mass, fStepSum[idvol], gMC->Edep()));
	345	// AliDebug(1,Form("Step:Track Momentum %f %f %f", fTrackMomentum.X(), fTrackMomentum.Y(),
	346	// fTrackMomentum.Z()));
	347	// gMC->TrackPosition(fTrackPosition);
	348	// AliDebug(1,Form("Step: Track Position %f %f %f",fTrackPosition.X(),
	349	// fTrackPosition.Y(),fTrackPosition.Z())) ;
	350	//}
	351
	352	// Track left chamber or StepSum larger than fStepMaxInActiveGas
	353	if ( gMC->IsTrackExiting() \|\|
	354	gMC->IsTrackStop() \|\|
	355	gMC->IsTrackDisappeared()\|\|
	356	(fStepSum[idvol]>fStepMaxInActiveGas) ) {
	357
	358	if ( gMC->IsTrackExiting() \|\|
	359	gMC->IsTrackStop() \|\|
	360	gMC->IsTrackDisappeared() ) gMC->SetMaxStep(kBig);
	361	if (fDestepSum[idvol] == 0) {
	362	// AZ - no energy release
	363	fStepSum[idvol] = 0; // Reset for the next event
	364	iEnter = 0;
	365	return;
	366	}
	367
	368	gMC->TrackPosition(fTrackPosition);
	369	Float_t theta = fTrackMomentum.Theta();
	370	Float_t phi = fTrackMomentum.Phi();
	371
	372	Int_t merge = 0;
	373	Double_t xyz0[3]={0}, xyz1[3]={0}, tmp[3]={0};
	374	if (gMC->IsTrackExiting() && iEnter != 0) {
	375	// AZ - this code is to avoid artificial hit splitting at the
	376	// "fake" boundary inside the same chamber. It will still produce
	377	// 2 hits but with the same coordinates (at the wire) to allow
	378	// their merging at the digitization level.
	379
	380	// Only for a track going from the entrance to the exit from the volume
	381	// Get local coordinates
	382	gMC->Gmtod(xyzEnter, xyz0, 1); // local coord. at the entrance
	383
	384	fTrackPosition.Vect().GetXYZ(tmp);
	385	gMC->Gmtod(tmp, xyz1, 1); // local coord. at the exit
	386	Float_t dx = xyz0[0] - xyz1[0];
	387	Float_t dy = xyz0[1] - xyz1[1];
	388	Float_t thLoc = TMath::ATan2 (TMath::Sqrt(dxdx+dydy), TMath::Abs(xyz0[2]-xyz1[2]));
	389	if (thLoc * TMath::RadToDeg() < 15) merge = 1;
	390	}
	391
	392	if (merge) {
	393	Double_t dz = -0.5;
	394	if (xyz1[2] != xyz0[2]) dz = xyz0[2] / (xyz1[2] - xyz0[2]);
	395	tmp[0] = xyz0[0] - (xyz1[0] - xyz0[0]) * dz; // local coord. at the wire
	396	tmp[1] = xyz0[1] - (xyz1[1] - xyz0[1]) * dz;
	397	tmp[2] = xyz0[2] - (xyz1[2] - xyz0[2]) * dz;
	398	gMC->Gdtom(tmp, xyz1, 1); // global coord. at the wire
	399	fTrackPosition.SetXYZT(xyz1[0], xyz1[1], xyz1[2], fTrackPosition.T());
	400	} else {
	401	TLorentzVector backToWire( fStepSum[idvol]/2.sin(theta)cos(phi),
	402	fStepSum[idvol]/2.sin(theta)sin(phi),
	403	fStepSum[idvol]/2.*cos(theta),0.0 );
	404	fTrackPosition-=backToWire;
	405	//printf(" %d %d %d %f %d \n", gMC->IsTrackExiting(), gMC->IsTrackStop(), gMC->IsTrackDisappeared(), fStepSum[idvol], iEnter);
	406	// AliDebug(1,
	407	// Form("Track Position %f %f %f",fTrackPosition.X(),fTrackPosition.Y(),fTrackPosition.Z()));
	408	// AliDebug(1,
	409	// Form("Exit: Track backToWire %f %f %f",backToWire.X(),backToWire.Y(),backToWire.Z())) ;
	410	}
	411
	412	//-------------- Angle effect
	413	// Ratio between energy loss of particle and Mip as a function of BetaGamma of particle (Energy/Mass)
	414
	415	Float_t betaxGamma = fTrackMomentum.P()/mass;// pc/mc2
	416	Float_t sigmaEffect10degrees;
	417	Float_t sigmaEffectThetadegrees;
	418	Float_t eLossParticleELossMip;
	419	Float_t yAngleEffect=0.;
	420	Float_t thetawires = TMath::ASin( TMath::Sin(TMath::Pi()-theta) * TMath::Sin(phi) ) ;// We use Pi-theta because z is negative
	421	Double_t bField[3] = {0};
	422	fTrackPosition.Vect().GetXYZ(tmp);
	423	TGeoGlobalMagField::Instance()->Field(tmp,bField);
	424
	425	if (fAngleEffect && !fMagEffect){
	426	thetawires = TMath::Abs(thetawires);
	427	if ( (betaxGamma >3.2) && (thetawires*kRaddeg<=15.) ) {
	428	betaxGamma=TMath::Log(betaxGamma);
	429	eLossParticleELossMip = fElossRatio->Eval(betaxGamma);
	430	// 10 degrees is a reference for a model (arbitrary)
	431	sigmaEffect10degrees=fAngleEffect10->Eval(eLossParticleELossMip);// in micrometers
	432	// Angle with respect to the wires assuming that chambers are perpendicular to the z axis.
	433	sigmaEffectThetadegrees = sigmaEffect10degrees/fAngleEffectNorma->Eval(thetawires*kRaddeg); // For 5mm gap
	434	if ( (iChamber==1) \|\| (iChamber==2) )
	435	sigmaEffectThetadegrees/=(1.09833e+00+1.70000e-02(thetawireskRaddeg)); // The gap is different (4mm)
	436	yAngleEffect=1.e-04*gRandom->Gaus(0,sigmaEffectThetadegrees); // Error due to the angle effect in cm
	437	}
	438	}
	439	else if (fAngleEffect && fMagEffect) {
	440	if ( (betaxGamma >3.2) && (TMath::Abs(thetawires*kRaddeg)<=15.) ) {
	441	betaxGamma=TMath::Log(betaxGamma);
	442	eLossParticleELossMip = fElossRatio->Eval(betaxGamma);
	443	// 10 degrees is a reference for a model (arbitrary)
	444	sigmaEffect10degrees=fAngleEffect10->Eval(eLossParticleELossMip);// in micrometers
	445	// Angle with respect to the wires assuming that chambers are perpendicular to the z axis.
	446	sigmaEffectThetadegrees = sigmaEffect10degrees/fMagAngleEffectNorma->Eval(thetawires*kRaddeg,bField[0]/10.); // For 5mm gap
	447	if ( (iChamber==1) \|\| (iChamber==2) )
	448	sigmaEffectThetadegrees/=(1.09833e+00+1.70000e-02(thetawireskRaddeg)); // The gap is different (4mm)
	449	yAngleEffect=1.e-04*gRandom->Gaus(0,sigmaEffectThetadegrees); // Error due to the angle effect in cm
	450	}
	451	}
	452
	453	AliMUONHit hit(fIshunt,
	454	gAlice->GetMCApp()->GetCurrentTrackNumber(),
	455	detElemId, ipart,
	456	fTrackPosition.X(),
	457	fTrackPosition.Y()+yAngleEffect,
	458	fTrackPosition.Z(),
	459	gMC->TrackTime(),
	460	fTrackMomentum.P(),
	461	theta,
	462	phi,
	463	fStepSum[idvol],
	464	fDestepSum[idvol],
	465	fTrackPosition.X(),
	466	fTrackPosition.Y(),
	467	fTrackPosition.Z());
	468
	469	fHitStore->Add(hit);
	470
	471	fStepSum[idvol] =0; // Reset for the next event
	472	fDestepSum[idvol]=0; // Reset for the next event
	473	iEnter = 0;
	474	}
	475	}