[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 "AliMUONSegFactory.h"
#include "AliMUONResponseFactory.h"
#include "AliMUONSegmentation.h"
#include "AliMUONHit.h"
#include "AliMUONGeometryBuilder.h"	
#include "AliMUONGeometry.h"	
#include "AliMUONGeometryTransformer.h"	
#include "AliMUONGeometryModule.h"	
#include "AliMUONStringIntMap.h"	
#include "AliMUONGeometryDetElement.h"	

#include "AliMpDEManager.h"

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

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

#include <string>

/// \cond CLASSIMP
ClassImp(AliMUONv1)
/// \endcond
 
//___________________________________________
AliMUONv1::AliMUONv1() 
  : AliMUON(),
    fAngleEffect(kTRUE),
    fStepMaxInActiveGas(0.6),
    fStepSum(0x0),
    fDestepSum(0x0),
    fTrackMomentum(), 
    fTrackPosition(),
    fElossRatio(0x0),
    fAngleEffect10(0x0),
    fAngleEffectNorma(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),
    fStepMaxInActiveGas(0.6),
    fStepSum(0x0),
    fDestepSum(0x0),
    fTrackMomentum(), 
    fTrackPosition(),
    fElossRatio(0x0),
    fAngleEffect10(0x0),
    fAngleEffectNorma(0x0)
{
/// Standard onstructor

    AliDebug(1,Form("ctor this=%p",this));	
	
    // 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);
}

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

//__________________________________________________
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
  //
  AliMUONSegFactory segFactory(GetGeometryTransformer());
  fSegmentation = segFactory.CreateSegmentation();

  // Build response
  //
  AliMUONResponseFactory respFactory("default");
  respFactory.Build(this);
  

  // Initialize segmentation
  //
  fSegmentation->Init();
  
}

//__________________________________________________________________
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());
    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::Abs( TMath::ASin( TMath::Sin(TMath::Pi()-theta) * TMath::Sin(phi) ) );// We use Pi-theta because z is negative


    if (fAngleEffect){
    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
    }
    }
    
    // One hit per chamber
    GetMUONData()->AddHit(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());

    //       AliDebug(1,Form("Exit: Particle exiting from chamber %d",iChamber));
    //       AliDebug(1,Form("Exit: StepSum %f eloss geant %g ",fStepSum[idvol],fDestepSum[idvol]));
    //       AliDebug(1,Form("Exit: Track Position %f %f %f",fTrackPosition.X(),fTrackPosition.Y(),fTrackPosition.Z()) ;

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