[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::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
a9e2aefa	1	/**************************************************************************
a9e2aefa	2	* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
0c527060	3	* *
a9e2aefa	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 *
2c799aa2	12	* about the suitability of this software for any purpeateose. It is *
a9e2aefa	13	* provided "as is" without express or implied warranty. *
	14	**************************************************************************/
	15
88cb7938	16	/* $Id$ */
a9e2aefa	17
3d1463c8	18	//-----------------------------------------------------------------------------
d19b6003	19	// Class AliMUONv1
	20	// --------------------
	21	// AliDetector class for MUON subsystem which implements
	22	// functions for simulation
3d1463c8	23	//-----------------------------------------------------------------------------
acc838fd	24
30178c30	25	#include "AliMUONv1.h"
88cb7938	26	#include "AliMUONConstants.h"
b7ef3c96	27	#include "AliMUONResponseFactory.h"
a9e2aefa	28	#include "AliMUONHit.h"
d4bb94a1	29	#include "AliMUONGeometryBuilder.h"
b7ef3c96	30	#include "AliMUONGeometry.h"
b7ef3c96	31	#include "AliMUONGeometryTransformer.h"
e118b27e	32	#include "AliMUONGeometryModule.h"
7ecf374b	33	#include "AliMUONStringIntMap.h"
e118b27e	34	#include "AliMUONGeometryDetElement.h"
7ecf374b	35
331a617a	36	#include "AliMpCDB.h"
273e54a3	37	#include "AliMpDEManager.h"
273e54a3	38
7ecf374b	39	#include "AliConst.h"
88cb7938	40	#include "AliMagF.h"
88cb7938	41	#include "AliRun.h"
5d12ce38	42	#include "AliMC.h"
d95fe39e	43	#include "AliTrackReference.h"
8c343c7c	44	#include "AliLog.h"
a9e2aefa	45
f7a1cc68	46	#include <TClonesArray.h>
7ecf374b	47	#include <TF1.h>
d7d39669	48	#include <TF2.h>
f7a1cc68	49	#include <TGeoGlobalMagField.h>
	50	#include <TGeoMatrix.h>
	51	#include <TRandom.h>
7ecf374b	52	#include <TRandom.h>
7ecf374b	53	#include <TVirtualMC.h>
7ecf374b	54
edee5e63	55	#include <string>
edee5e63	56
bb2bab35	57	#include "AliMUONVHitStore.h"
bb2bab35	58
5398f946	59	/// \cond CLASSIMP
a9e2aefa	60	ClassImp(AliMUONv1)
5398f946	61	/// \endcond
a9e2aefa	62
a9e2aefa	63	//___________________________________________
30178c30	64	AliMUONv1::AliMUONv1()
30178c30	65	: AliMUON(),
d4bb94a1	66	fAngleEffect(kTRUE),
d7d39669	67	fMagEffect(kTRUE),
d4bb94a1	68	fStepMaxInActiveGas(0.6),
	69	fStepSum(0x0),
	70	fDestepSum(0x0),
	71	fTrackMomentum(),
	72	fTrackPosition(),
	73	fElossRatio(0x0),
	74	fAngleEffect10(0x0),
d7d39669	75	fAngleEffectNorma(0x0),
d7d39669	76	fMagAngleEffectNorma(0x0)
a9e2aefa	77	{
d19b6003	78	/// Default constructor
	79
	80	AliDebug(1,Form("default (empty) ctor this=%p",this));
1391e633	81	}
d4bb94a1	82
a9e2aefa	83	//___________________________________________
9bf406e1	84	AliMUONv1::AliMUONv1(const char name, const char title)
9bf406e1	85	: AliMUON(name, title),
d4bb94a1	86	fAngleEffect(kTRUE),
d7d39669	87	fMagEffect(kTRUE),
d4bb94a1	88	fStepMaxInActiveGas(0.6),
	89	fStepSum(0x0),
	90	fDestepSum(0x0),
	91	fTrackMomentum(),
	92	fTrackPosition(),
	93	fElossRatio(0x0),
	94	fAngleEffect10(0x0),
d7d39669	95	fAngleEffectNorma(0x0),
d7d39669	96	fMagAngleEffectNorma(0x0)
a9e2aefa	97	{
d19b6003	98	/// Standard onstructor
d4bb94a1	99
d19b6003	100	AliDebug(1,Form("ctor this=%p",this));
edee5e63	101
331a617a	102	// Load mapping
	103	if ( ! AliMpCDB::LoadMpSegmentation() ) {
	104	AliFatal("Could not access mapping from OCDB !");
	105	}
	106
ba030c0e	107	// By default include all stations
c33d9661	108
1391e633	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);
d7d39669	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);
a9e2aefa	140	}
	141
	142	//___________________________________________
acc838fd	143	AliMUONv1::~AliMUONv1()
a9e2aefa	144	{
d19b6003	145	/// Destructor
	146
	147	AliDebug(1,Form("dtor this=%p",this));
d4bb94a1	148	delete [] fStepSum;
	149	delete [] fDestepSum;
	150	delete fElossRatio;
	151	delete fAngleEffect10;
8109731a	152	delete fAngleEffectNorma;
d7d39669	153	delete fMagAngleEffectNorma;
acc838fd	154	}
b17c0c87	155
acc838fd	156	//__________________________________________________
	157	void AliMUONv1::CreateGeometry()
	158	{
d19b6003	159	/// Construct geometry using geometry builder
a9e2aefa	160
d4bb94a1	161	fGeometryBuilder->CreateGeometry();
acc838fd	162	}
a9e2aefa	163
acc838fd	164	//________________________________________________________________
a9e2aefa	165	void AliMUONv1::CreateMaterials()
a9e2aefa	166	{
d19b6003	167	/// Construct materials using geometry builder
acc838fd	168
d4bb94a1	169	fGeometryBuilder->CreateMaterials();
a9e2aefa	170	}
a9e2aefa	171
c28b5041	172	//________________________________________________________________
	173	void AliMUONv1::AddAlignableVolumes() const
	174	{
	175	/// Construct materials using geometry builder
	176
	177	GetGeometryTransformer()->AddAlignableVolumes();
	178	}
	179
	180
acc838fd	181	//___________________________________________
a9e2aefa	182	void AliMUONv1::Init()
a713db22	183	{
d19b6003	184	/// Initialize geometry
d19b6003	185
edee5e63	186	AliDebug(1,"Start Init for version 1 - CPC chamber type");
002920d1	187
edee5e63	188	fGeometryBuilder->InitGeometry();
edee5e63	189	AliDebug(1,"Finished Init for version 1 - CPC chamber type");
b7ef3c96	190
b7ef3c96	191
b7ef3c96	192	// Build segmentation
	193	// using geometry parametrisation
	194	//
b7ef3c96	195	// Build response
edee5e63	196	//
43d7561d	197	AliMUONResponseFactory respFactory("default", fIsTailEffect);
b7ef3c96	198	respFactory.Build(this);
b7ef3c96	199
a9e2aefa	200	}
1391e633	201
d4bb94a1	202	//__________________________________________________________________
273e54a3	203	Int_t AliMUONv1::GetGeomModuleId(Int_t volId) const
d4bb94a1	204	{
d19b6003	205	/// Check if the volume with specified volId is a sensitive volume (gas)
5398f946	206	/// of some chamber and return the chamber number;
d19b6003	207	/// if not sensitive volume - return 0.
d4bb94a1	208
273e54a3	209	for (Int_t i = 0; i < AliMUONConstants::NGeomModules(); i++) {
b7ef3c96	210	if ( GetGeometry()->GetModule(i)->IsSensitiveVolume(volId) )
273e54a3	211	return i;
b7ef3c96	212	}
d4bb94a1	213
273e54a3	214	return -1;
d4bb94a1	215	}
333f7cda	216
	217	//_______________________________________________________________________________
	218	TString AliMUONv1::CurrentVolumePath() const
	219	{
d19b6003	220	/// Return current volume path
d19b6003	221	/// (Could be removed when this function is available via gMC)
333f7cda	222
	223	TString path = "";
	224	TString name;
	225	Int_t copyNo;
	226	Int_t imother = 0;
	227	do {
	228	name = gMC->CurrentVolOffName(imother);
	229	gMC->CurrentVolOffID(imother++, copyNo);
	230	TString add = "/";
	231	add += name;
7ecf374b	232	add += "_";
333f7cda	233	add += copyNo;
	234	path.Insert(0,add);
	235	}
	236	while ( name != TString("ALIC") );
	237
	238	return path;
	239	}
	240
1391e633	241	//_______________________________________________________________________________
c33d9661	242	void AliMUONv1::StepManager()
c33d9661	243	{
d19b6003	244	/// Step manager for the chambers
c33d9661	245
c33d9661	246	// Only charged tracks
d59b2ec3	247	if( !(gMC->TrackCharge()) ) return;
1391e633	248	// Only charged tracks
1391e633	249
c33d9661	250	// Only gas gap inside chamber
c33d9661	251	// Tag chambers and record hits when track enters
d95fe39e	252	static Int_t idvol=-1, iEnter = 0;
1391e633	253	Int_t copy;
1391e633	254	const Float_t kBig = 1.e10;
d95fe39e	255	static Double_t xyzEnter[3];
acc838fd	256
	257	//
	258	// Only gas gap inside chamber
	259	// Tag chambers and record hits when track enters
273e54a3	260	Int_t id=gMC->CurrentVolID(copy);
	261	Int_t iGeomModule = GetGeomModuleId(id);
	262	if (iGeomModule == -1) return;
acc838fd	263
d95fe39e	264	// Detection elements id
d95fe39e	265	const AliMUONGeometryModule* kGeometryModule
273e54a3	266	= GetGeometry()->GetModule(iGeomModule);
d95fe39e	267	AliMUONGeometryDetElement* detElement
d95fe39e	268	= kGeometryModule->FindBySensitiveVolume(CurrentVolumePath());
273e54a3	269
	270	if (!detElement && iGeomModule < AliMUONConstants::NGeomModules()-2) {
	271	iGeomModule++;
	272	const AliMUONGeometryModule* kGeometryModule2
	273	= GetGeometry()->GetModule(iGeomModule);
	274	detElement
	275	= kGeometryModule2->FindBySensitiveVolume(CurrentVolumePath());
	276	}
374ebd7d	277
d95fe39e	278	Int_t detElemId = 0;
d95fe39e	279	if (detElement) detElemId = detElement->GetUniqueID();
333f7cda	280
d95fe39e	281	if (!detElemId) {
273e54a3	282	AliErrorStream()
	283	<< "Geometry module id: "
	284	<< setw(3) << iGeomModule << " "
d95fe39e	285	<< "Current SV: "
	286	<< CurrentVolumePath()
	287	<< " detElemId: "
	288	<< setw(5) << detElemId
	289	<< endl;
	290	Double_t x, y, z;
	291	gMC->TrackPosition(x, y, z);
273e54a3	292	AliErrorStream()
273e54a3	293	<< " global position: "
d95fe39e	294	<< x << ", " << y << ", " << z
d95fe39e	295	<< endl;
273e54a3	296	AliErrorStream() << "DetElemId not identified." << endl;
	297	}
	298
	299	Int_t iChamber = AliMpDEManager::GetChamberId(detElemId) + 1;
	300	idvol = iChamber -1;
333f7cda	301
d59b2ec3	302	// Filling TrackRefs file for MUON. Our Track references are the active volume of the chambers
d95fe39e	303	if ( (gMC->IsTrackEntering() \|\| gMC->IsTrackExiting() ) ) {
d95fe39e	304	AliTrackReference* trackReference
e6add757	305	= AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber(), AliTrackReference::kMUON);
d95fe39e	306	trackReference->SetUserId(detElemId);
d95fe39e	307	}
d59b2ec3	308
d95fe39e	309	if( gMC->IsTrackEntering() ) {
d59b2ec3	310	Float_t theta = fTrackMomentum.Theta();
d59b2ec3	311	if ((TMath::Pi()-theta)*kRaddeg>=15.) gMC->SetMaxStep(fStepMaxInActiveGas); // We use Pi-theta because z is negative
c5ce4e69	312	iEnter = 1;
c5ce4e69	313	gMC->TrackPosition(xyzEnter[0], xyzEnter[1], xyzEnter[2]); // save coordinates of entrance point
d59b2ec3	314	}
d59b2ec3	315
5a0e88a7	316	// AliDebug(1,
	317	// Form("Active volume found %d chamber %d Z chamber is %f ",idvol,iChamber,
	318	// ( (AliMUONChamber)(fChambers)[idvol])->Z())) ;
d59b2ec3	319	// Particule id and mass,
	320	Int_t ipart = gMC->TrackPid();
	321	Float_t mass = gMC->TrackMass();
	322
	323	fDestepSum[idvol]+=gMC->Edep();
	324	// Get current particle id (ipart), track position (pos) and momentum (mom)
	325	if ( fStepSum[idvol]==0.0 ) gMC->TrackMomentum(fTrackMomentum);
	326	fStepSum[idvol]+=gMC->TrackStep();
	327
5a0e88a7	328	// if (AliDebugLevel()) {
	329	// AliDebug(1,Form("Step, iChamber %d, Particle %d, theta %f phi %f mass %f StepSum %f eloss %g",
	330	// iChamber,ipart, fTrackMomentum.Theta()kRaddeg, fTrackMomentum.Phi()kRaddeg,
	331	// mass, fStepSum[idvol], gMC->Edep()));
	332	// AliDebug(1,Form("Step:Track Momentum %f %f %f", fTrackMomentum.X(), fTrackMomentum.Y(),
	333	// fTrackMomentum.Z()));
	334	// gMC->TrackPosition(fTrackPosition);
	335	// AliDebug(1,Form("Step: Track Position %f %f %f",fTrackPosition.X(),
	336	// fTrackPosition.Y(),fTrackPosition.Z())) ;
	337	//}
d59b2ec3	338
	339	// Track left chamber or StepSum larger than fStepMaxInActiveGas
	340	if ( gMC->IsTrackExiting() \|\|
	341	gMC->IsTrackStop() \|\|
	342	gMC->IsTrackDisappeared()\|\|
	343	(fStepSum[idvol]>fStepMaxInActiveGas) ) {
	344
	345	if ( gMC->IsTrackExiting() \|\|
	346	gMC->IsTrackStop() \|\|
	347	gMC->IsTrackDisappeared() ) gMC->SetMaxStep(kBig);
c5ce4e69	348	if (fDestepSum[idvol] == 0) {
	349	// AZ - no energy release
	350	fStepSum[idvol] = 0; // Reset for the next event
	351	iEnter = 0;
	352	return;
	353	}
d59b2ec3	354
	355	gMC->TrackPosition(fTrackPosition);
	356	Float_t theta = fTrackMomentum.Theta();
	357	Float_t phi = fTrackMomentum.Phi();
	358
795b3f56	359	Int_t merge = 0;
795b3f56	360	Double_t xyz0[3]={0}, xyz1[3]={0}, tmp[3]={0};
c5ce4e69	361	if (gMC->IsTrackExiting() && iEnter != 0) {
	362	// AZ - this code is to avoid artificial hit splitting at the
	363	// "fake" boundary inside the same chamber. It will still produce
	364	// 2 hits but with the same coordinates (at the wire) to allow
	365	// their merging at the digitization level.
	366
	367	// Only for a track going from the entrance to the exit from the volume
	368	// Get local coordinates
c5ce4e69	369	gMC->Gmtod(xyzEnter, xyz0, 1); // local coord. at the entrance
	370
	371	fTrackPosition.Vect().GetXYZ(tmp);
	372	gMC->Gmtod(tmp, xyz1, 1); // local coord. at the exit
795b3f56	373	Float_t dx = xyz0[0] - xyz1[0];
	374	Float_t dy = xyz0[1] - xyz1[1];
	375	Float_t thLoc = TMath::ATan2 (TMath::Sqrt(dxdx+dydy), TMath::Abs(xyz0[2]-xyz1[2]));
	376	if (thLoc * TMath::RadToDeg() < 15) merge = 1;
	377	}
c5ce4e69	378
795b3f56	379	if (merge) {
c5ce4e69	380	Double_t dz = -0.5;
	381	if (xyz1[2] != xyz0[2]) dz = xyz0[2] / (xyz1[2] - xyz0[2]);
	382	tmp[0] = xyz0[0] - (xyz1[0] - xyz0[0]) * dz; // local coord. at the wire
	383	tmp[1] = xyz0[1] - (xyz1[1] - xyz0[1]) * dz;
	384	tmp[2] = xyz0[2] - (xyz1[2] - xyz0[2]) * dz;
	385	gMC->Gdtom(tmp, xyz1, 1); // global coord. at the wire
	386	fTrackPosition.SetXYZT(xyz1[0], xyz1[1], xyz1[2], fTrackPosition.T());
	387	} else {
	388	TLorentzVector backToWire( fStepSum[idvol]/2.sin(theta)cos(phi),
	389	fStepSum[idvol]/2.sin(theta)sin(phi),
	390	fStepSum[idvol]/2.*cos(theta),0.0 );
	391	fTrackPosition-=backToWire;
	392	//printf(" %d %d %d %f %d \n", gMC->IsTrackExiting(), gMC->IsTrackStop(), gMC->IsTrackDisappeared(), fStepSum[idvol], iEnter);
	393	// AliDebug(1,
	394	// Form("Track Position %f %f %f",fTrackPosition.X(),fTrackPosition.Y(),fTrackPosition.Z()));
	395	// AliDebug(1,
	396	// Form("Exit: Track backToWire %f %f %f",backToWire.X(),backToWire.Y(),backToWire.Z())) ;
	397	}
d59b2ec3	398
	399	//-------------- Angle effect
	400	// Ratio between energy loss of particle and Mip as a function of BetaGamma of particle (Energy/Mass)
	401
	402	Float_t betaxGamma = fTrackMomentum.P()/mass;// pc/mc2
	403	Float_t sigmaEffect10degrees;
	404	Float_t sigmaEffectThetadegrees;
	405	Float_t eLossParticleELossMip;
	406	Float_t yAngleEffect=0.;
d7d39669	407	Float_t thetawires = TMath::ASin( TMath::Sin(TMath::Pi()-theta) * TMath::Sin(phi) ) ;// We use Pi-theta because z is negative
	408	Double_t bField[3] = {0};
	409	fTrackPosition.Vect().GetXYZ(tmp);
f7a1cc68	410	TGeoGlobalMagField::Instance()->Field(tmp,bField);
d59b2ec3	411
d7d39669	412	if (fAngleEffect && !fMagEffect){
d7d39669	413	thetawires = TMath::Abs(thetawires);
d59b2ec3	414	if ( (betaxGamma >3.2) && (thetawires*kRaddeg<=15.) ) {
	415	betaxGamma=TMath::Log(betaxGamma);
	416	eLossParticleELossMip = fElossRatio->Eval(betaxGamma);
	417	// 10 degrees is a reference for a model (arbitrary)
	418	sigmaEffect10degrees=fAngleEffect10->Eval(eLossParticleELossMip);// in micrometers
	419	// Angle with respect to the wires assuming that chambers are perpendicular to the z axis.
	420	sigmaEffectThetadegrees = sigmaEffect10degrees/fAngleEffectNorma->Eval(thetawires*kRaddeg); // For 5mm gap
	421	if ( (iChamber==1) \|\| (iChamber==2) )
	422	sigmaEffectThetadegrees/=(1.09833e+00+1.70000e-02(thetawireskRaddeg)); // The gap is different (4mm)
	423	yAngleEffect=1.e-04*gRandom->Gaus(0,sigmaEffectThetadegrees); // Error due to the angle effect in cm
	424	}
	425	}
d7d39669	426	else if (fAngleEffect && fMagEffect) {
	427	if ( (betaxGamma >3.2) && (TMath::Abs(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/fMagAngleEffectNorma->Eval(thetawires*kRaddeg,bField[0]/10.); // 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	}
d59b2ec3	439
d7d39669	440	AliMUONHit hit(fIshunt,
	441	gAlice->GetMCApp()->GetCurrentTrackNumber(),
	442	detElemId, ipart,
	443	fTrackPosition.X(),
	444	fTrackPosition.Y()+yAngleEffect,
	445	fTrackPosition.Z(),
	446	gMC->TrackTime(),
	447	fTrackMomentum.P(),
	448	theta,
	449	phi,
	450	fStepSum[idvol],
	451	fDestepSum[idvol],
	452	fTrackPosition.X(),
	453	fTrackPosition.Y(),
	454	fTrackPosition.Z());
	455
bb2bab35	456	fHitStore->Add(hit);
5a0e88a7	457
d59b2ec3	458	fStepSum[idvol] =0; // Reset for the next event
d59b2ec3	459	fDestepSum[idvol]=0; // Reset for the next event
c5ce4e69	460	iEnter = 0;
d59b2ec3	461	}
d59b2ec3	462	}