[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 "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,
                     const char* sDigitizerClassName,
                     const char* digitizerClassName)
: AliMUON(name,title,sDigitizerClassName,digitizerClassName), 
    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");   
 

  std::string ftype(GetTitle());

  // Build segmentation
  // using geometry parametrisation
  //
  AliMUONSegFactory segFactory(GetGeometryTransformer());
  fSegmentation = segFactory.CreateSegmentation(ftype);

  if (!fSegmentation) {
    AliFatal(Form("Wrong factory type : %s",ftype.c_str()));
  }        

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

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

//__________________________________________________________________
Int_t  AliMUONv1::GetChamberId(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::NCh(); i++) {
    if ( GetGeometry()->GetModule(i)->IsSensitiveVolume(volId) )
      return i+1;
  }    

  return 0;
}

//_______________________________________________________________________________
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   iChamber=0;
  Int_t   id=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 
  id=gMC->CurrentVolID(copy);
  iChamber = GetChamberId(id);
  idvol = iChamber -1;

  if (idvol == -1) return;
  
  // Detection elements id
  const AliMUONGeometryModule* kGeometryModule
    = GetGeometry()->GetModule(iChamber-1);

  AliMUONGeometryDetElement* detElement
    = kGeometryModule->FindBySensitiveVolume(CurrentVolumePath());

  Int_t detElemId = 0;
  if (detElement) detElemId = detElement->GetUniqueID(); 
 
  if (!detElemId) {
    cerr << "Chamber id: "
  	 << setw(3) << iChamber << "  "
  	 << "Current SV: " 
  	 <<  CurrentVolumePath() 
         << "  detElemId: "
  	 << setw(5) << detElemId 
         << endl;
    Double_t x, y, z;
    gMC->TrackPosition(x, y, z);	 
    cerr << "	global position: "
  	 << x << ", " << y << ", " << z
  	 << endl;
    AliError("DetElemId not identified.");
  }  
    
  // 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()->AddHit2(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
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
d19b6003	18	// --------------------
	19	// Class AliMUONv1
	20	// --------------------
	21	// AliDetector class for MUON subsystem which implements
	22	// functions for simulation
acc838fd	23
30178c30	24	#include "AliMUONv1.h"
88cb7938	25	#include "AliMUONConstants.h"
40afd6cd	26	#include "AliMUONSegFactory.h"
b7ef3c96	27	#include "AliMUONResponseFactory.h"
b7ef3c96	28	#include "AliMUONSegmentation.h"
a9e2aefa	29	#include "AliMUONHit.h"
d4bb94a1	30	#include "AliMUONGeometryBuilder.h"
b7ef3c96	31	#include "AliMUONGeometry.h"
b7ef3c96	32	#include "AliMUONGeometryTransformer.h"
e118b27e	33	#include "AliMUONGeometryModule.h"
7ecf374b	34	#include "AliMUONStringIntMap.h"
e118b27e	35	#include "AliMUONGeometryDetElement.h"
7ecf374b	36
7ecf374b	37	#include "AliConst.h"
88cb7938	38	#include "AliMagF.h"
88cb7938	39	#include "AliRun.h"
5d12ce38	40	#include "AliMC.h"
d95fe39e	41	#include "AliTrackReference.h"
8c343c7c	42	#include "AliLog.h"
a9e2aefa	43
7ecf374b	44	#include <TRandom.h>
	45	#include <TF1.h>
	46	#include <TClonesArray.h>
	47	#include <TRandom.h>
	48	#include <TVirtualMC.h>
	49	#include <TGeoMatrix.h>
	50
edee5e63	51	#include <string>
edee5e63	52
5398f946	53	/// \cond CLASSIMP
a9e2aefa	54	ClassImp(AliMUONv1)
5398f946	55	/// \endcond
a9e2aefa	56
a9e2aefa	57	//___________________________________________
30178c30	58	AliMUONv1::AliMUONv1()
30178c30	59	: AliMUON(),
d4bb94a1	60	fAngleEffect(kTRUE),
	61	fStepMaxInActiveGas(0.6),
	62	fStepSum(0x0),
	63	fDestepSum(0x0),
	64	fTrackMomentum(),
	65	fTrackPosition(),
	66	fElossRatio(0x0),
	67	fAngleEffect10(0x0),
b7ef3c96	68	fAngleEffectNorma(0x0)
a9e2aefa	69	{
d19b6003	70	/// Default constructor
	71
	72	AliDebug(1,Form("default (empty) ctor this=%p",this));
1391e633	73	}
d4bb94a1	74
a9e2aefa	75	//___________________________________________
b05d84a5	76	AliMUONv1::AliMUONv1(const char name, const char title,
	77	const char* sDigitizerClassName,
	78	const char* digitizerClassName)
	79	: AliMUON(name,title,sDigitizerClassName,digitizerClassName),
d4bb94a1	80	fAngleEffect(kTRUE),
	81	fStepMaxInActiveGas(0.6),
	82	fStepSum(0x0),
	83	fDestepSum(0x0),
	84	fTrackMomentum(),
	85	fTrackPosition(),
	86	fElossRatio(0x0),
	87	fAngleEffect10(0x0),
b7ef3c96	88	fAngleEffectNorma(0x0)
a9e2aefa	89	{
d19b6003	90	/// Standard onstructor
d4bb94a1	91
d19b6003	92	AliDebug(1,Form("ctor this=%p",this));
edee5e63	93
ba030c0e	94	// By default include all stations
c33d9661	95
1391e633	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);
a9e2aefa	122	}
	123
	124	//___________________________________________
acc838fd	125	AliMUONv1::~AliMUONv1()
a9e2aefa	126	{
d19b6003	127	/// Destructor
	128
	129	AliDebug(1,Form("dtor this=%p",this));
d4bb94a1	130	delete [] fStepSum;
	131	delete [] fDestepSum;
	132	delete fElossRatio;
	133	delete fAngleEffect10;
8109731a	134	delete fAngleEffectNorma;
acc838fd	135	}
b17c0c87	136
acc838fd	137	//__________________________________________________
	138	void AliMUONv1::CreateGeometry()
	139	{
d19b6003	140	/// Construct geometry using geometry builder
a9e2aefa	141
d4bb94a1	142	fGeometryBuilder->CreateGeometry();
acc838fd	143	}
a9e2aefa	144
acc838fd	145	//________________________________________________________________
a9e2aefa	146	void AliMUONv1::CreateMaterials()
a9e2aefa	147	{
d19b6003	148	/// Construct materials using geometry builder
acc838fd	149
d4bb94a1	150	fGeometryBuilder->CreateMaterials();
a9e2aefa	151	}
a9e2aefa	152
c28b5041	153	//________________________________________________________________
	154	void AliMUONv1::AddAlignableVolumes() const
	155	{
	156	/// Construct materials using geometry builder
	157
	158	GetGeometryTransformer()->AddAlignableVolumes();
	159	}
	160
	161
acc838fd	162	//___________________________________________
a9e2aefa	163	void AliMUONv1::Init()
a713db22	164	{
d19b6003	165	/// Initialize geometry
d19b6003	166
edee5e63	167	AliDebug(1,"Start Init for version 1 - CPC chamber type");
002920d1	168
edee5e63	169	fGeometryBuilder->InitGeometry();
edee5e63	170	AliDebug(1,"Finished Init for version 1 - CPC chamber type");
b7ef3c96	171
b7ef3c96	172
edee5e63	173	std::string ftype(GetTitle());
b7ef3c96	174
	175	// Build segmentation
	176	// using geometry parametrisation
	177	//
40afd6cd	178	AliMUONSegFactory segFactory(GetGeometryTransformer());
	179	fSegmentation = segFactory.CreateSegmentation(ftype);
	180
	181	if (!fSegmentation) {
	182	AliFatal(Form("Wrong factory type : %s",ftype.c_str()));
	183	}
b7ef3c96	184
b7ef3c96	185	// Build response
edee5e63	186	//
b7ef3c96	187	AliMUONResponseFactory respFactory("default");
	188	respFactory.Build(this);
	189
	190
edee5e63	191	// Initialize segmentation
edee5e63	192	//
b7ef3c96	193	fSegmentation->Init();
edee5e63	194
a9e2aefa	195	}
1391e633	196
d4bb94a1	197	//__________________________________________________________________
	198	Int_t AliMUONv1::GetChamberId(Int_t volId) const
	199	{
d19b6003	200	/// Check if the volume with specified volId is a sensitive volume (gas)
5398f946	201	/// of some chamber and return the chamber number;
d19b6003	202	/// if not sensitive volume - return 0.
d4bb94a1	203
b7ef3c96	204	for (Int_t i = 0; i < AliMUONConstants::NCh(); i++) {
	205	if ( GetGeometry()->GetModule(i)->IsSensitiveVolume(volId) )
	206	return i+1;
	207	}
d4bb94a1	208
	209	return 0;
	210	}
333f7cda	211
	212	//_______________________________________________________________________________
	213	TString AliMUONv1::CurrentVolumePath() const
	214	{
d19b6003	215	/// Return current volume path
d19b6003	216	/// (Could be removed when this function is available via gMC)
333f7cda	217
	218	TString path = "";
	219	TString name;
	220	Int_t copyNo;
	221	Int_t imother = 0;
	222	do {
	223	name = gMC->CurrentVolOffName(imother);
	224	gMC->CurrentVolOffID(imother++, copyNo);
	225	TString add = "/";
	226	add += name;
7ecf374b	227	add += "_";
333f7cda	228	add += copyNo;
	229	path.Insert(0,add);
	230	}
	231	while ( name != TString("ALIC") );
	232
	233	return path;
	234	}
	235
1391e633	236	//_______________________________________________________________________________
c33d9661	237	void AliMUONv1::StepManager()
c33d9661	238	{
d19b6003	239	/// Step manager for the chambers
c33d9661	240
c33d9661	241	// Only charged tracks
d59b2ec3	242	if( !(gMC->TrackCharge()) ) return;
1391e633	243	// Only charged tracks
1391e633	244
c33d9661	245	// Only gas gap inside chamber
c33d9661	246	// Tag chambers and record hits when track enters
d95fe39e	247	static Int_t idvol=-1, iEnter = 0;
1391e633	248	Int_t iChamber=0;
	249	Int_t id=0;
	250	Int_t copy;
	251	const Float_t kBig = 1.e10;
d95fe39e	252	static Double_t xyzEnter[3];
acc838fd	253
	254	//
	255	// Only gas gap inside chamber
	256	// Tag chambers and record hits when track enters
c33d9661	257	id=gMC->CurrentVolID(copy);
acc838fd	258	iChamber = GetChamberId(id);
	259	idvol = iChamber -1;
	260
	261	if (idvol == -1) return;
abaf7c9d	262
d95fe39e	263	// Detection elements id
	264	const AliMUONGeometryModule* kGeometryModule
	265	= GetGeometry()->GetModule(iChamber-1);
d7c4fbc4	266
d95fe39e	267	AliMUONGeometryDetElement* detElement
d95fe39e	268	= kGeometryModule->FindBySensitiveVolume(CurrentVolumePath());
374ebd7d	269
d95fe39e	270	Int_t detElemId = 0;
d95fe39e	271	if (detElement) detElemId = detElement->GetUniqueID();
333f7cda	272
d95fe39e	273	if (!detElemId) {
	274	cerr << "Chamber id: "
	275	<< setw(3) << iChamber << " "
	276	<< "Current SV: "
	277	<< CurrentVolumePath()
	278	<< " detElemId: "
	279	<< setw(5) << detElemId
	280	<< endl;
	281	Double_t x, y, z;
	282	gMC->TrackPosition(x, y, z);
	283	cerr << " global position: "
	284	<< x << ", " << y << ", " << z
	285	<< endl;
	286	AliError("DetElemId not identified.");
	287	}
333f7cda	288
d59b2ec3	289	// Filling TrackRefs file for MUON. Our Track references are the active volume of the chambers
d95fe39e	290	if ( (gMC->IsTrackEntering() \|\| gMC->IsTrackExiting() ) ) {
	291	AliTrackReference* trackReference
	292	= AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber());
	293	trackReference->SetUserId(detElemId);
	294	}
d59b2ec3	295
d95fe39e	296	if( gMC->IsTrackEntering() ) {
d59b2ec3	297	Float_t theta = fTrackMomentum.Theta();
d59b2ec3	298	if ((TMath::Pi()-theta)*kRaddeg>=15.) gMC->SetMaxStep(fStepMaxInActiveGas); // We use Pi-theta because z is negative
c5ce4e69	299	iEnter = 1;
c5ce4e69	300	gMC->TrackPosition(xyzEnter[0], xyzEnter[1], xyzEnter[2]); // save coordinates of entrance point
d59b2ec3	301	}
d59b2ec3	302
5a0e88a7	303	// AliDebug(1,
	304	// Form("Active volume found %d chamber %d Z chamber is %f ",idvol,iChamber,
	305	// ( (AliMUONChamber)(fChambers)[idvol])->Z())) ;
d59b2ec3	306	// Particule id and mass,
	307	Int_t ipart = gMC->TrackPid();
	308	Float_t mass = gMC->TrackMass();
	309
	310	fDestepSum[idvol]+=gMC->Edep();
	311	// Get current particle id (ipart), track position (pos) and momentum (mom)
	312	if ( fStepSum[idvol]==0.0 ) gMC->TrackMomentum(fTrackMomentum);
	313	fStepSum[idvol]+=gMC->TrackStep();
	314
5a0e88a7	315	// if (AliDebugLevel()) {
	316	// AliDebug(1,Form("Step, iChamber %d, Particle %d, theta %f phi %f mass %f StepSum %f eloss %g",
	317	// iChamber,ipart, fTrackMomentum.Theta()kRaddeg, fTrackMomentum.Phi()kRaddeg,
	318	// mass, fStepSum[idvol], gMC->Edep()));
	319	// AliDebug(1,Form("Step:Track Momentum %f %f %f", fTrackMomentum.X(), fTrackMomentum.Y(),
	320	// fTrackMomentum.Z()));
	321	// gMC->TrackPosition(fTrackPosition);
	322	// AliDebug(1,Form("Step: Track Position %f %f %f",fTrackPosition.X(),
	323	// fTrackPosition.Y(),fTrackPosition.Z())) ;
	324	//}
d59b2ec3	325
	326	// Track left chamber or StepSum larger than fStepMaxInActiveGas
	327	if ( gMC->IsTrackExiting() \|\|
	328	gMC->IsTrackStop() \|\|
	329	gMC->IsTrackDisappeared()\|\|
	330	(fStepSum[idvol]>fStepMaxInActiveGas) ) {
	331
	332	if ( gMC->IsTrackExiting() \|\|
	333	gMC->IsTrackStop() \|\|
	334	gMC->IsTrackDisappeared() ) gMC->SetMaxStep(kBig);
c5ce4e69	335	if (fDestepSum[idvol] == 0) {
	336	// AZ - no energy release
	337	fStepSum[idvol] = 0; // Reset for the next event
	338	iEnter = 0;
	339	return;
	340	}
d59b2ec3	341
	342	gMC->TrackPosition(fTrackPosition);
	343	Float_t theta = fTrackMomentum.Theta();
	344	Float_t phi = fTrackMomentum.Phi();
	345
795b3f56	346	Int_t merge = 0;
795b3f56	347	Double_t xyz0[3]={0}, xyz1[3]={0}, tmp[3]={0};
c5ce4e69	348	if (gMC->IsTrackExiting() && iEnter != 0) {
	349	// AZ - this code is to avoid artificial hit splitting at the
	350	// "fake" boundary inside the same chamber. It will still produce
	351	// 2 hits but with the same coordinates (at the wire) to allow
	352	// their merging at the digitization level.
	353
	354	// Only for a track going from the entrance to the exit from the volume
	355	// Get local coordinates
c5ce4e69	356	gMC->Gmtod(xyzEnter, xyz0, 1); // local coord. at the entrance
	357
	358	fTrackPosition.Vect().GetXYZ(tmp);
	359	gMC->Gmtod(tmp, xyz1, 1); // local coord. at the exit
795b3f56	360	Float_t dx = xyz0[0] - xyz1[0];
	361	Float_t dy = xyz0[1] - xyz1[1];
	362	Float_t thLoc = TMath::ATan2 (TMath::Sqrt(dxdx+dydy), TMath::Abs(xyz0[2]-xyz1[2]));
	363	if (thLoc * TMath::RadToDeg() < 15) merge = 1;
	364	}
c5ce4e69	365
795b3f56	366	if (merge) {
c5ce4e69	367	Double_t dz = -0.5;
	368	if (xyz1[2] != xyz0[2]) dz = xyz0[2] / (xyz1[2] - xyz0[2]);
	369	tmp[0] = xyz0[0] - (xyz1[0] - xyz0[0]) * dz; // local coord. at the wire
	370	tmp[1] = xyz0[1] - (xyz1[1] - xyz0[1]) * dz;
	371	tmp[2] = xyz0[2] - (xyz1[2] - xyz0[2]) * dz;
	372	gMC->Gdtom(tmp, xyz1, 1); // global coord. at the wire
	373	fTrackPosition.SetXYZT(xyz1[0], xyz1[1], xyz1[2], fTrackPosition.T());
	374	} else {
	375	TLorentzVector backToWire( fStepSum[idvol]/2.sin(theta)cos(phi),
	376	fStepSum[idvol]/2.sin(theta)sin(phi),
	377	fStepSum[idvol]/2.*cos(theta),0.0 );
	378	fTrackPosition-=backToWire;
	379	//printf(" %d %d %d %f %d \n", gMC->IsTrackExiting(), gMC->IsTrackStop(), gMC->IsTrackDisappeared(), fStepSum[idvol], iEnter);
	380	// AliDebug(1,
	381	// Form("Track Position %f %f %f",fTrackPosition.X(),fTrackPosition.Y(),fTrackPosition.Z()));
	382	// AliDebug(1,
	383	// Form("Exit: Track backToWire %f %f %f",backToWire.X(),backToWire.Y(),backToWire.Z())) ;
	384	}
d59b2ec3	385
	386	//-------------- Angle effect
	387	// Ratio between energy loss of particle and Mip as a function of BetaGamma of particle (Energy/Mass)
	388
	389	Float_t betaxGamma = fTrackMomentum.P()/mass;// pc/mc2
	390	Float_t sigmaEffect10degrees;
	391	Float_t sigmaEffectThetadegrees;
	392	Float_t eLossParticleELossMip;
	393	Float_t yAngleEffect=0.;
	394	Float_t thetawires = TMath::Abs( TMath::ASin( TMath::Sin(TMath::Pi()-theta) * TMath::Sin(phi) ) );// We use Pi-theta because z is negative
	395
	396
	397	if (fAngleEffect){
	398	if ( (betaxGamma >3.2) && (thetawires*kRaddeg<=15.) ) {
	399	betaxGamma=TMath::Log(betaxGamma);
	400	eLossParticleELossMip = fElossRatio->Eval(betaxGamma);
	401	// 10 degrees is a reference for a model (arbitrary)
	402	sigmaEffect10degrees=fAngleEffect10->Eval(eLossParticleELossMip);// in micrometers
	403	// Angle with respect to the wires assuming that chambers are perpendicular to the z axis.
	404	sigmaEffectThetadegrees = sigmaEffect10degrees/fAngleEffectNorma->Eval(thetawires*kRaddeg); // For 5mm gap
	405	if ( (iChamber==1) \|\| (iChamber==2) )
	406	sigmaEffectThetadegrees/=(1.09833e+00+1.70000e-02(thetawireskRaddeg)); // The gap is different (4mm)
	407	yAngleEffect=1.e-04*gRandom->Gaus(0,sigmaEffectThetadegrees); // Error due to the angle effect in cm
	408	}
	409	}
	410
d59b2ec3	411	// One hit per chamber
8690a0a6	412	GetMUONData()->AddHit2(fIshunt,
d59b2ec3	413	gAlice->GetMCApp()->GetCurrentTrackNumber(),
	414	detElemId, ipart,
	415	fTrackPosition.X(),
	416	fTrackPosition.Y()+yAngleEffect,
	417	fTrackPosition.Z(),
	418	gMC->TrackTime(),
	419	fTrackMomentum.P(),
	420	theta,
	421	phi,
	422	fStepSum[idvol],
	423	fDestepSum[idvol],
	424	fTrackPosition.X(),
	425	fTrackPosition.Y(),
	426	fTrackPosition.Z());
	427
5a0e88a7	428	// AliDebug(1,Form("Exit: Particle exiting from chamber %d",iChamber));
	429	// AliDebug(1,Form("Exit: StepSum %f eloss geant %g ",fStepSum[idvol],fDestepSum[idvol]));
	430	// AliDebug(1,Form("Exit: Track Position %f %f %f",fTrackPosition.X(),fTrackPosition.Y(),fTrackPosition.Z()) ;
	431
d59b2ec3	432	fStepSum[idvol] =0; // Reset for the next event
d59b2ec3	433	fDestepSum[idvol]=0; // Reset for the next event
c5ce4e69	434	iEnter = 0;
d59b2ec3	435	}
d59b2ec3	436	}