[u/mrichter/AliRoot.git] / HMPID / AliHMPIDParam.cxx

//  **************************************************************************
//  * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
//  *                                                                        *
//  * Author: The ALICE Off-line Project.                                    *
//  * Contributors are mentioned in the code where appropriate.              *
//  *                                                                        *
//  * Permission to use, copy, modify and distribute this software and its   *
//  * documentation strictly for non-commercial purposes is hereby granted   *
//  * without fee, provided that the above copyright notice appears in all   *
//  * copies and that both the copyright notice and this permission notice   *
//  * appear in the supporting documentation. The authors make no claims     *
//  * about the suitability of this software for any purpose. It is          *
//  * provided "as is" without express or implied warranty.                  *
//  **************************************************************************
#include "AliHMPIDParam.h"  //class header
#include "AliHMPIDDigit.h"  //ctor
#include "AliLog.h"         //general
#include <AliRunLoader.h>   //Stack()
#include <AliStack.h>       //Stack()
#include <TLatex.h>         //TestTrans()  
#include <TView.h>          //TestTrans()
#include <TPolyMarker3D.h>  //TestTrans()
#include <TRotation.h>
#include <TParticle.h>      //Stack()    
#include <TGeoPhysicalNode.h> //ctor
#include <TGeoBBox.h>
ClassImp(AliHMPIDParam)


Float_t AliHMPIDParam::fgkMinPcX[]={0.,0.,0.,0.,0.,0.};
Float_t AliHMPIDParam::fgkMaxPcX[]={0.,0.,0.,0.,0.,0.};
Float_t AliHMPIDParam::fgkMinPcY[]={0.,0.,0.,0.,0.,0.};
Float_t AliHMPIDParam::fgkMaxPcY[]={0.,0.,0.,0.,0.,0.};

Float_t AliHMPIDParam::fgCellX=0.;
Float_t AliHMPIDParam::fgCellY=0.;

Float_t AliHMPIDParam::fgPcX=0;
Float_t AliHMPIDParam::fgPcY=0;

Float_t AliHMPIDParam::fgAllX=0;
Float_t AliHMPIDParam::fgAllY=0;

Bool_t AliHMPIDParam::fgInstanceType=kTRUE;  

AliHMPIDParam* AliHMPIDParam::fgInstance=0x0;        //singleton pointer               
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
AliHMPIDParam::AliHMPIDParam(Bool_t noGeo=kFALSE):TNamed("HmpidParam","default version") 
{
// Here all the intitializition is taken place when AliHMPIDParam::Instance() is invoked for the first time.
// In particular, matrices to be used for LORS<->MARS trasnformations are initialized from TGeo structure.    
// Note that TGeoManager should be already initialized from geometry.root file  

  fgSigmas=4;

  fRadNmean = MeanIdxRad(); //initialization of the running ref. index of freon
  
  Float_t dead=2.6;// cm of the dead zones between PCs-> See 2CRC2099P1


  if(noGeo==kTRUE) fgInstanceType=kFALSE;                                                   //instance from ideal geometry, no actual geom is present
    
  if(noGeo==kFALSE && !gGeoManager)  
  {
    TGeoManager::Import("geometry.root");
    if(!gGeoManager) AliFatal("!!!!!!No geometry loaded!!!!!!!");
  }
  
  fgCellX=0.8;fgCellY=0.84;
  
  if(!noGeo==kTRUE){
    TGeoVolume *pCellVol = gGeoManager->GetVolume("Hcel");
    if(pCellVol) {
      TGeoBBox *bcell = (TGeoBBox *)pCellVol->GetShape();
      fgCellX=2.*bcell->GetDX(); fgCellY = 2.*bcell->GetDY();  // overwrite the values with the read ones
    }
  }    
  fgPcX=80.*fgCellX; fgPcY = 48.*fgCellY;
  fgAllX=2.*fgPcX+dead;
  fgAllY=3.*fgPcY+2.*dead;

  fgkMinPcX[1]=fgPcX+dead; fgkMinPcX[3]=fgkMinPcX[1];  fgkMinPcX[5]=fgkMinPcX[3];
  fgkMaxPcX[0]=fgPcX; fgkMaxPcX[2]=fgkMaxPcX[0];  fgkMaxPcX[4]=fgkMaxPcX[2];
  fgkMaxPcX[1]=fgAllX; fgkMaxPcX[3]=fgkMaxPcX[1];  fgkMaxPcX[5]=fgkMaxPcX[3];

  fgkMinPcY[2]=fgPcY+dead; fgkMinPcY[3]=fgkMinPcY[2];  
  fgkMinPcY[4]=2.*fgPcY+2.*dead; fgkMinPcY[5]=fgkMinPcY[4];
  fgkMaxPcY[0]=fgPcY; fgkMaxPcY[1]=fgkMaxPcY[0];  
  fgkMaxPcY[2]=2.*fgPcY+dead; fgkMaxPcY[3]=fgkMaxPcY[2]; 
  fgkMaxPcY[4]=fgAllY; fgkMaxPcY[5]=fgkMaxPcY[4];   
    
  fX=0.5*SizeAllX();
  fY=0.5*SizeAllY();
  
  for(Int_t i=kMinCh;i<=kMaxCh;i++) 
    if(gGeoManager && gGeoManager->IsClosed()) {
      TGeoPNEntry* pne = gGeoManager->GetAlignableEntry(Form("/HMPID/Chamber%i",i));
      if (!pne) {
        AliErrorClass(Form("The symbolic volume %s does not correspond to any physical entry!",Form("HMPID_%i",i)));
        fM[i]=new TGeoHMatrix;
        IdealPosition(i,fM[i]);
      } else {
        TGeoPhysicalNode *pnode = pne->GetPhysicalNode();
        if(pnode) fM[i]=pnode->GetMatrix();
        else {
          fM[i]=new TGeoHMatrix;
          IdealPosition(i,fM[i]);
        }
      }
    } else{
      fM[i]=new TGeoHMatrix;
      IdealPosition(i,fM[i]);
    } 
  fgInstance=this; 
}//ctor
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
void AliHMPIDParam::Print(Option_t* opt) const
{
// print some usefull (hopefully) info on some internal guts of HMPID parametrisation 
  
  for(Int_t i=0;i<7;i++) fM[i]->Print(opt);
}//Print()
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
void AliHMPIDParam::IdealPosition(Int_t iCh, TGeoHMatrix *pMatrix)
{
// Construct ideal position matrix for a given chamber
// Arguments: iCh- chamber ID; pMatrix- pointer to precreated unity matrix where to store the results
//   Returns: none
  const Double_t kAngHor=19.5;        //  horizontal angle between chambers  19.5 grad
  const Double_t kAngVer=20;          //  vertical angle between chambers    20   grad     
  const Double_t kAngCom=30;          //  common HMPID rotation with respect to x axis  30   grad     
  const Double_t kTrans[3]={490,0,0}; //  center of the chamber is on window-gap surface
  pMatrix->RotateY(90);               //  rotate around y since initial position is in XY plane -> now in YZ plane
  pMatrix->SetTranslation(kTrans);    //  now plane in YZ is shifted along x 
  switch(iCh){
    case 0:                pMatrix->RotateY(kAngHor);  pMatrix->RotateZ(-kAngVer);  break; //right and down 
    case 1:                                            pMatrix->RotateZ(-kAngVer);  break; //down              
    case 2:                pMatrix->RotateY(kAngHor);                               break; //right 
    case 3:                                                                         break; //no rotation
    case 4:                pMatrix->RotateY(-kAngHor);                              break; //left   
    case 5:                                            pMatrix->RotateZ(kAngVer);   break; //up
    case 6:                pMatrix->RotateY(-kAngHor); pMatrix->RotateZ(kAngVer);   break; //left and up 
  }
  pMatrix->RotateZ(kAngCom);     //apply common rotation  in XY plane    
   
}
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Int_t AliHMPIDParam::Stack(Int_t evt,Int_t tid)
{
// Prints some useful info from stack
// Arguments: evt - event number. if not -1 print info only for that event
//            tid - track id. if not -1 then print it and all it's mothers if any   
//   Returns: mother tid of the given tid if any
  AliRunLoader *pAL=AliRunLoader::Open(); 
  if(pAL->LoadHeader()) return -1;
  if(pAL->LoadKinematics()) return -1;
  
  Int_t mtid=-1;
  Int_t iNevt=pAL->GetNumberOfEvents();
  
  for(Int_t iEvt=0;iEvt<iNevt;iEvt++){//events loop
    if(evt!=-1 && evt!=iEvt) continue; //in case one needs to print the requested event, ignore all others
    pAL->GetEvent(iEvt);    
    AliStack *pStack=pAL->Stack();  
    if(tid==-1){                        //print all tids for this event
      for(Int_t i=0;i<pStack->GetNtrack();i++) pStack->Particle(i)->Print();
          Printf("totally %i tracks including %i primaries for event %i out of %i event(s)",
          pStack->GetNtrack(),pStack->GetNprimary(),iEvt,iNevt);
    }else{                              //print only this tid and it;s mothers
      if(tid<0 || tid>pStack->GetNtrack()) {Printf("Wrong tid, valid tid range for event %i is 0-%i",iEvt,pStack->GetNtrack());break;}
      TParticle *pTrack=pStack->Particle(tid); mtid=pTrack->GetFirstMother();
      TString str=pTrack->GetName();
      while((tid=pTrack->GetFirstMother()) >= 0){
        pTrack=pStack->Particle(tid);
        str+=" from ";str+=pTrack->GetName();
      } 
    }//if(tid==-1)      
  }//events loop
  pAL->UnloadHeader();  pAL->UnloadKinematics();
  return mtid;
}
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Int_t AliHMPIDParam::StackCount(Int_t pid,Int_t evt)
{
// Counts total number of particles of given sort (including secondary) for a given event
  AliRunLoader *pAL=AliRunLoader::Open(); 
  pAL->GetEvent(evt);    
  if(pAL->LoadHeader()) return 0;
  if(pAL->LoadKinematics()) return 0;
  AliStack *pStack=pAL->Stack();
  
  Int_t iCnt=0;
  for(Int_t i=0;i<pStack->GetNtrack();i++) if(pStack->Particle(i)->GetPdgCode()==pid) iCnt++;
  
  pAL->UnloadHeader();  pAL->UnloadKinematics();
  return iCnt;
}
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Double_t AliHMPIDParam::Sigma2(Double_t trkTheta,Double_t trkPhi,Double_t ckovTh, Double_t ckovPh)
{
// Analithical calculation of total error (as a sum of localization, geometrical and chromatic errors) on Cerenkov angle for a given Cerenkov photon 
// created by a given MIP. Fromulae according to CERN-EP-2000-058 
// Arguments: Cerenkov and azimuthal angles for Cerenkov photon, [radians]
//            dip and azimuthal angles for MIP taken at the entrance to radiator, [radians]        
//            MIP beta
//   Returns: absolute error on Cerenkov angle, [radians]    
  
  TVector3 v(-999,-999,-999);
  Double_t trkBeta = 1./(TMath::Cos(ckovTh)*GetRefIdx());
  
  if(trkBeta > 1) trkBeta = 1;                 //protection against bad measured thetaCer  
  if(trkBeta < 0) trkBeta = 0.0001;            //

  v.SetX(SigLoc (trkTheta,trkPhi,ckovTh,ckovPh,trkBeta));
  v.SetY(SigGeom(trkTheta,trkPhi,ckovTh,ckovPh,trkBeta));
  v.SetZ(SigCrom(trkTheta,trkPhi,ckovTh,ckovPh,trkBeta));

  return v.Mag2();
}
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Double_t AliHMPIDParam::SigLoc(Double_t trkTheta,Double_t trkPhi,Double_t thetaC, Double_t phiC,Double_t betaM)
{
// Analitical calculation of localization error (due to finite segmentation of PC) on Cerenkov angle for a given Cerenkov photon 
// created by a given MIP. Fromulae according to CERN-EP-2000-058 
// Arguments: Cerenkov and azimuthal angles for Cerenkov photon, [radians]
//            dip and azimuthal angles for MIP taken at the entrance to radiator, [radians]        
//            MIP beta
//   Returns: absolute error on Cerenkov angle, [radians]    
  
  Double_t phiDelta = phiC - trkPhi;

  Double_t sint     = TMath::Sin(trkTheta);
  Double_t cost     = TMath::Cos(trkTheta);
  Double_t sinf     = TMath::Sin(trkPhi);
  Double_t cosf     = TMath::Cos(trkPhi);
  Double_t sinfd    = TMath::Sin(phiDelta);
  Double_t cosfd    = TMath::Cos(phiDelta);
  Double_t tantheta = TMath::Tan(thetaC);
  
  Double_t alpha =cost-tantheta*cosfd*sint;                                                 // formula (11)
  Double_t k = 1.-GetRefIdx()*GetRefIdx()+alpha*alpha/(betaM*betaM);        // formula (after 8 in the text)
  if (k<0) return 1e10;
  Double_t mu =sint*sinf+tantheta*(cost*cosfd*sinf+sinfd*cosf);                             // formula (10)
  Double_t e  =sint*cosf+tantheta*(cost*cosfd*cosf-sinfd*sinf);                             // formula (9)

  Double_t kk = betaM*TMath::Sqrt(k)/(GapThick()*alpha);                            // formula (6) and (7)
  Double_t dtdxc = kk*(k*(cosfd*cosf-cost*sinfd*sinf)-(alpha*mu/(betaM*betaM))*sint*sinfd); // formula (6)           
  Double_t dtdyc = kk*(k*(cosfd*sinf+cost*sinfd*cosf)+(alpha* e/(betaM*betaM))*sint*sinfd); // formula (7)            pag.4

  Double_t errX = 0.2,errY=0.25;                                                            //end of page 7
  return  TMath::Sqrt(errX*errX*dtdxc*dtdxc + errY*errY*dtdyc*dtdyc);
}
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Double_t AliHMPIDParam::SigCrom(Double_t trkTheta,Double_t trkPhi,Double_t thetaC, Double_t phiC,Double_t betaM)
{
// Analitical calculation of chromatic error (due to lack of knowledge of Cerenkov photon energy) on Cerenkov angle for a given Cerenkov photon 
// created by a given MIP. Fromulae according to CERN-EP-2000-058 
// Arguments: Cerenkov and azimuthal angles for Cerenkov photon, [radians]
//            dip and azimuthal angles for MIP taken at the entrance to radiator, [radians]        
//            MIP beta
//   Returns: absolute error on Cerenkov angle, [radians]    
  
  Double_t phiDelta = phiC - trkPhi;

  Double_t sint     = TMath::Sin(trkTheta);
  Double_t cost     = TMath::Cos(trkTheta);
  Double_t cosfd    = TMath::Cos(phiDelta);
  Double_t tantheta = TMath::Tan(thetaC);
  
  Double_t alpha =cost-tantheta*cosfd*sint;                                                 // formula (11)
  Double_t dtdn = cost*GetRefIdx()*betaM*betaM/(alpha*tantheta);                    // formula (12)
            
//  Double_t f = 0.00928*(7.75-5.635)/TMath::Sqrt(12.);
  Double_t f = 0.0172*(7.75-5.635)/TMath::Sqrt(24.);

  return f*dtdn;
}//SigCrom()
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Double_t AliHMPIDParam::SigGeom(Double_t trkTheta,Double_t trkPhi,Double_t thetaC, Double_t phiC,Double_t betaM)
{
// Analitical calculation of geometric error (due to lack of knowledge of creation point in radiator) on Cerenkov angle for a given Cerenkov photon 
// created by a given MIP. Formulae according to CERN-EP-2000-058 
// Arguments: Cerenkov and azimuthal angles for Cerenkov photon, [radians]
//            dip and azimuthal angles for MIP taken at the entrance to radiator, [radians]        
//            MIP beta
//   Returns: absolute error on Cerenkov angle, [radians]    

  Double_t phiDelta = phiC - trkPhi;

  Double_t sint     = TMath::Sin(trkTheta);
  Double_t cost     = TMath::Cos(trkTheta);
  Double_t sinf     = TMath::Sin(trkPhi);
  Double_t cosfd    = TMath::Cos(phiDelta);
  Double_t costheta = TMath::Cos(thetaC);
  Double_t tantheta = TMath::Tan(thetaC);
  
  Double_t alpha =cost-tantheta*cosfd*sint;                                                  // formula (11)
  
  Double_t k = 1.-GetRefIdx()*GetRefIdx()+alpha*alpha/(betaM*betaM);         // formula (after 8 in the text)
  if (k<0) return 1e10;

  Double_t eTr = 0.5*RadThick()*betaM*TMath::Sqrt(k)/(GapThick()*alpha);     // formula (14)
  Double_t lambda = 1.-sint*sint*sinf*sinf;                                                  // formula (15)

  Double_t c1 = 1./(1.+ eTr*k/(alpha*alpha*costheta*costheta));                              // formula (13.a)
  Double_t c2 = betaM*TMath::Power(k,1.5)*tantheta*lambda/(GapThick()*alpha*alpha);  // formula (13.b)
  Double_t c3 = (1.+eTr*k*betaM*betaM)/((1+eTr)*alpha*alpha);                                // formula (13.c)
  Double_t c4 = TMath::Sqrt(k)*tantheta*(1-lambda)/(GapThick()*betaM);               // formula (13.d)
  Double_t dtdT = c1 * (c2+c3*c4);
  Double_t trErr = RadThick()/(TMath::Sqrt(12.)*cost);

  return trErr*dtdT;
}//SigGeom()
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Commit	Line	Data
d3da6dc4	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 purpose. It is *
	13	// * provided "as is" without express or implied warranty. *
	14	// **************************************************************************
	15	#include "AliHMPIDParam.h" //class header
	16	#include "AliHMPIDDigit.h" //ctor
a8ff381e	17	#include "AliLog.h" //general
	18	#include <AliRunLoader.h> //Stack()
	19	#include <AliStack.h> //Stack()
	20	#include <TLatex.h> //TestTrans()
	21	#include <TView.h> //TestTrans()
	22	#include <TPolyMarker3D.h> //TestTrans()
d3da6dc4	23	#include <TRotation.h>
a8ff381e	24	#include <TParticle.h> //Stack()
97eadc2b	25	#include <TGeoPhysicalNode.h> //ctor
ae5a42aa	26	#include <TGeoBBox.h>
d3da6dc4	27	ClassImp(AliHMPIDParam)
d3da6dc4	28
ae5a42aa	29
	30	Float_t AliHMPIDParam::fgkMinPcX[]={0.,0.,0.,0.,0.,0.};
	31	Float_t AliHMPIDParam::fgkMaxPcX[]={0.,0.,0.,0.,0.,0.};
	32	Float_t AliHMPIDParam::fgkMinPcY[]={0.,0.,0.,0.,0.,0.};
	33	Float_t AliHMPIDParam::fgkMaxPcY[]={0.,0.,0.,0.,0.,0.};
	34
	35	Float_t AliHMPIDParam::fgCellX=0.;
	36	Float_t AliHMPIDParam::fgCellY=0.;
	37
	38	Float_t AliHMPIDParam::fgPcX=0;
	39	Float_t AliHMPIDParam::fgPcY=0;
	40
	41	Float_t AliHMPIDParam::fgAllX=0;
	42	Float_t AliHMPIDParam::fgAllY=0;
	43
b87365d5	44	Bool_t AliHMPIDParam::fgInstanceType=kTRUE;
ae5a42aa	45
d3da6dc4	46	AliHMPIDParam* AliHMPIDParam::fgInstance=0x0; //singleton pointer
d3da6dc4	47	//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
58fc9564	48	AliHMPIDParam::AliHMPIDParam(Bool_t noGeo=kFALSE):TNamed("HmpidParam","default version")
d3da6dc4	49	{
d3da6dc4	50	// Here all the intitializition is taken place when AliHMPIDParam::Instance() is invoked for the first time.
58fc9564	51	// In particular, matrices to be used for LORS<->MARS trasnformations are initialized from TGeo structure.
d3da6dc4	52	// Note that TGeoManager should be already initialized from geometry.root file
ae5a42aa	53
b38ac33a	54	fgSigmas=4;
b38ac33a	55
a8ff381e	56	fRadNmean = MeanIdxRad(); //initialization of the running ref. index of freon
a8ff381e	57
8e2a911a	58	Float_t dead=2.6;// cm of the dead zones between PCs-> See 2CRC2099P1
b87365d5	59
	60
	61	if(noGeo==kTRUE) fgInstanceType=kFALSE; //instance from ideal geometry, no actual geom is present
	62
58fc9564	63	if(noGeo==kFALSE && !gGeoManager)
	64	{
	65	TGeoManager::Import("geometry.root");
	66	if(!gGeoManager) AliFatal("!!!!!!No geometry loaded!!!!!!!");
	67	}
	68
8e2a911a	69	fgCellX=0.8;fgCellY=0.84;
58fc9564	70
8e2a911a	71	if(!noGeo==kTRUE){
	72	TGeoVolume *pCellVol = gGeoManager->GetVolume("Hcel");
	73	if(pCellVol) {
	74	TGeoBBox bcell = (TGeoBBox )pCellVol->GetShape();
	75	fgCellX=2.bcell->GetDX(); fgCellY = 2.bcell->GetDY(); // overwrite the values with the read ones
	76	}
	77	}
58fc9564	78	fgPcX=80.fgCellX; fgPcY = 48.fgCellY;
	79	fgAllX=2.*fgPcX+dead;
	80	fgAllY=3.fgPcY+2.dead;
ae5a42aa	81
58fc9564	82	fgkMinPcX[1]=fgPcX+dead; fgkMinPcX[3]=fgkMinPcX[1]; fgkMinPcX[5]=fgkMinPcX[3];
	83	fgkMaxPcX[0]=fgPcX; fgkMaxPcX[2]=fgkMaxPcX[0]; fgkMaxPcX[4]=fgkMaxPcX[2];
	84	fgkMaxPcX[1]=fgAllX; fgkMaxPcX[3]=fgkMaxPcX[1]; fgkMaxPcX[5]=fgkMaxPcX[3];
ae5a42aa	85
58fc9564	86	fgkMinPcY[2]=fgPcY+dead; fgkMinPcY[3]=fgkMinPcY[2];
	87	fgkMinPcY[4]=2.fgPcY+2.dead; fgkMinPcY[5]=fgkMinPcY[4];
	88	fgkMaxPcY[0]=fgPcY; fgkMaxPcY[1]=fgkMaxPcY[0];
	89	fgkMaxPcY[2]=2.*fgPcY+dead; fgkMaxPcY[3]=fgkMaxPcY[2];
	90	fgkMaxPcY[4]=fgAllY; fgkMaxPcY[5]=fgkMaxPcY[4];
ae5a42aa	91
	92	fX=0.5*SizeAllX();
	93	fY=0.5*SizeAllY();
58fc9564	94
ae5a42aa	95	for(Int_t i=kMinCh;i<=kMaxCh;i++)
97eadc2b	96	if(gGeoManager && gGeoManager->IsClosed()) {
2df6b16e	97	TGeoPNEntry* pne = gGeoManager->GetAlignableEntry(Form("/HMPID/Chamber%i",i));
97eadc2b	98	if (!pne) {
	99	AliErrorClass(Form("The symbolic volume %s does not correspond to any physical entry!",Form("HMPID_%i",i)));
	100	fM[i]=new TGeoHMatrix;
	101	IdealPosition(i,fM[i]);
	102	} else {
	103	TGeoPhysicalNode *pnode = pne->GetPhysicalNode();
f80e1da4	104	if(pnode) fM[i]=pnode->GetMatrix();
	105	else {
	106	fM[i]=new TGeoHMatrix;
	107	IdealPosition(i,fM[i]);
	108	}
97eadc2b	109	}
97eadc2b	110	} else{
1d4857c5	111	fM[i]=new TGeoHMatrix;
	112	IdealPosition(i,fM[i]);
	113	}
d3da6dc4	114	fgInstance=this;
	115	}//ctor
	116	//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
	117	void AliHMPIDParam::Print(Option_t* opt) const
	118	{
	119	// print some usefull (hopefully) info on some internal guts of HMPID parametrisation
	120
	121	for(Int_t i=0;i<7;i++) fM[i]->Print(opt);
	122	}//Print()
	123	//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1d4857c5	124	void AliHMPIDParam::IdealPosition(Int_t iCh, TGeoHMatrix *pMatrix)
	125	{
	126	// Construct ideal position matrix for a given chamber
	127	// Arguments: iCh- chamber ID; pMatrix- pointer to precreated unity matrix where to store the results
	128	// Returns: none
423554a3	129	const Double_t kAngHor=19.5; // horizontal angle between chambers 19.5 grad
	130	const Double_t kAngVer=20; // vertical angle between chambers 20 grad
	131	const Double_t kAngCom=30; // common HMPID rotation with respect to x axis 30 grad
	132	const Double_t kTrans[3]={490,0,0}; // center of the chamber is on window-gap surface
	133	pMatrix->RotateY(90); // rotate around y since initial position is in XY plane -> now in YZ plane
	134	pMatrix->SetTranslation(kTrans); // now plane in YZ is shifted along x
1d4857c5	135	switch(iCh){
	136	case 0: pMatrix->RotateY(kAngHor); pMatrix->RotateZ(-kAngVer); break; //right and down
	137	case 1: pMatrix->RotateZ(-kAngVer); break; //down
	138	case 2: pMatrix->RotateY(kAngHor); break; //right
	139	case 3: break; //no rotation
	140	case 4: pMatrix->RotateY(-kAngHor); break; //left
	141	case 5: pMatrix->RotateZ(kAngVer); break; //up
	142	case 6: pMatrix->RotateY(-kAngHor); pMatrix->RotateZ(kAngVer); break; //left and up
	143	}
	144	pMatrix->RotateZ(kAngCom); //apply common rotation in XY plane
	145
	146	}
	147	//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
d3da6dc4	148	Int_t AliHMPIDParam::Stack(Int_t evt,Int_t tid)
d3da6dc4	149	{
d1bf51e1	150	// Prints some useful info from stack
d3da6dc4	151	// Arguments: evt - event number. if not -1 print info only for that event
	152	// tid - track id. if not -1 then print it and all it's mothers if any
	153	// Returns: mother tid of the given tid if any
	154	AliRunLoader *pAL=AliRunLoader::Open();
	155	if(pAL->LoadHeader()) return -1;
	156	if(pAL->LoadKinematics()) return -1;
	157
	158	Int_t mtid=-1;
cf7e313e	159	Int_t iNevt=pAL->GetNumberOfEvents();
d3da6dc4	160
	161	for(Int_t iEvt=0;iEvt<iNevt;iEvt++){//events loop
	162	if(evt!=-1 && evt!=iEvt) continue; //in case one needs to print the requested event, ignore all others
	163	pAL->GetEvent(iEvt);
	164	AliStack *pStack=pAL->Stack();
	165	if(tid==-1){ //print all tids for this event
	166	for(Int_t i=0;i<pStack->GetNtrack();i++) pStack->Particle(i)->Print();
a8ff381e	167	Printf("totally %i tracks including %i primaries for event %i out of %i event(s)",
a8ff381e	168	pStack->GetNtrack(),pStack->GetNprimary(),iEvt,iNevt);
d3da6dc4	169	}else{ //print only this tid and it;s mothers
	170	if(tid<0 \|\| tid>pStack->GetNtrack()) {Printf("Wrong tid, valid tid range for event %i is 0-%i",iEvt,pStack->GetNtrack());break;}
	171	TParticle *pTrack=pStack->Particle(tid); mtid=pTrack->GetFirstMother();
	172	TString str=pTrack->GetName();
	173	while((tid=pTrack->GetFirstMother()) >= 0){
	174	pTrack=pStack->Particle(tid);
	175	str+=" from ";str+=pTrack->GetName();
	176	}
d3da6dc4	177	}//if(tid==-1)
	178	}//events loop
	179	pAL->UnloadHeader(); pAL->UnloadKinematics();
	180	return mtid;
	181	}
	182	//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
	183	Int_t AliHMPIDParam::StackCount(Int_t pid,Int_t evt)
	184	{
	185	// Counts total number of particles of given sort (including secondary) for a given event
	186	AliRunLoader *pAL=AliRunLoader::Open();
	187	pAL->GetEvent(evt);
	188	if(pAL->LoadHeader()) return 0;
	189	if(pAL->LoadKinematics()) return 0;
	190	AliStack *pStack=pAL->Stack();
	191
	192	Int_t iCnt=0;
	193	for(Int_t i=0;i<pStack->GetNtrack();i++) if(pStack->Particle(i)->GetPdgCode()==pid) iCnt++;
	194
	195	pAL->UnloadHeader(); pAL->UnloadKinematics();
	196	return iCnt;
	197	}
	198	//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
3278403b	199	Double_t AliHMPIDParam::Sigma2(Double_t trkTheta,Double_t trkPhi,Double_t ckovTh, Double_t ckovPh)
	200	{
	201	// Analithical calculation of total error (as a sum of localization, geometrical and chromatic errors) on Cerenkov angle for a given Cerenkov photon
	202	// created by a given MIP. Fromulae according to CERN-EP-2000-058
	203	// Arguments: Cerenkov and azimuthal angles for Cerenkov photon, [radians]
	204	// dip and azimuthal angles for MIP taken at the entrance to radiator, [radians]
	205	// MIP beta
	206	// Returns: absolute error on Cerenkov angle, [radians]
	207
	208	TVector3 v(-999,-999,-999);
	209	Double_t trkBeta = 1./(TMath::Cos(ckovTh)*GetRefIdx());
	210
	211	if(trkBeta > 1) trkBeta = 1; //protection against bad measured thetaCer
	212	if(trkBeta < 0) trkBeta = 0.0001; //
	213
	214	v.SetX(SigLoc (trkTheta,trkPhi,ckovTh,ckovPh,trkBeta));
	215	v.SetY(SigGeom(trkTheta,trkPhi,ckovTh,ckovPh,trkBeta));
	216	v.SetZ(SigCrom(trkTheta,trkPhi,ckovTh,ckovPh,trkBeta));
	217
	218	return v.Mag2();
	219	}
	220	//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
	221	Double_t AliHMPIDParam::SigLoc(Double_t trkTheta,Double_t trkPhi,Double_t thetaC, Double_t phiC,Double_t betaM)
	222	{
	223	// Analitical calculation of localization error (due to finite segmentation of PC) on Cerenkov angle for a given Cerenkov photon
	224	// created by a given MIP. Fromulae according to CERN-EP-2000-058
	225	// Arguments: Cerenkov and azimuthal angles for Cerenkov photon, [radians]
	226	// dip and azimuthal angles for MIP taken at the entrance to radiator, [radians]
	227	// MIP beta
	228	// Returns: absolute error on Cerenkov angle, [radians]
	229
	230	Double_t phiDelta = phiC - trkPhi;
	231
	232	Double_t sint = TMath::Sin(trkTheta);
	233	Double_t cost = TMath::Cos(trkTheta);
	234	Double_t sinf = TMath::Sin(trkPhi);
	235	Double_t cosf = TMath::Cos(trkPhi);
	236	Double_t sinfd = TMath::Sin(phiDelta);
	237	Double_t cosfd = TMath::Cos(phiDelta);
	238	Double_t tantheta = TMath::Tan(thetaC);
	239
	240	Double_t alpha =cost-tanthetacosfdsint; // formula (11)
	241	Double_t k = 1.-GetRefIdx()GetRefIdx()+alphaalpha/(betaM*betaM); // formula (after 8 in the text)
	242	if (k<0) return 1e10;
	243	Double_t mu =sintsinf+tantheta(costcosfdsinf+sinfd*cosf); // formula (10)
	244	Double_t e =sintcosf+tantheta(costcosfdcosf-sinfd*sinf); // formula (9)
	245
	246	Double_t kk = betaMTMath::Sqrt(k)/(GapThick()alpha); // formula (6) and (7)
	247	Double_t dtdxc = kk(k(cosfdcosf-costsinfdsinf)-(alphamu/(betaMbetaM))sint*sinfd); // formula (6)
	248	Double_t dtdyc = kk(k(cosfdsinf+costsinfdcosf)+(alpha e/(betaMbetaM))sint*sinfd); // formula (7) pag.4
	249
	250	Double_t errX = 0.2,errY=0.25; //end of page 7
	251	return TMath::Sqrt(errXerrXdtdxcdtdxc + errYerrYdtdycdtdyc);
	252	}
	253	//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
	254	Double_t AliHMPIDParam::SigCrom(Double_t trkTheta,Double_t trkPhi,Double_t thetaC, Double_t phiC,Double_t betaM)
	255	{
	256	// Analitical calculation of chromatic error (due to lack of knowledge of Cerenkov photon energy) on Cerenkov angle for a given Cerenkov photon
	257	// created by a given MIP. Fromulae according to CERN-EP-2000-058
	258	// Arguments: Cerenkov and azimuthal angles for Cerenkov photon, [radians]
	259	// dip and azimuthal angles for MIP taken at the entrance to radiator, [radians]
	260	// MIP beta
	261	// Returns: absolute error on Cerenkov angle, [radians]
	262
263	Double_t phiDelta = phiC - trkPhi;
264
265	Double_t sint = TMath::Sin(trkTheta);
266	Double_t cost = TMath::Cos(trkTheta);
267	Double_t cosfd = TMath::Cos(phiDelta);
268	Double_t tantheta = TMath::Tan(thetaC);
269
270	Double_t alpha =cost-tanthetacosfdsint; // formula (11)
271	Double_t dtdn = costGetRefIdx()betaMbetaM/(alphatantheta); // formula (12)
272
273	// Double_t f = 0.00928*(7.75-5.635)/TMath::Sqrt(12.);
274	Double_t f = 0.0172*(7.75-5.635)/TMath::Sqrt(24.);
275
276	return f*dtdn;
277	}//SigCrom()
278	//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
279	Double_t AliHMPIDParam::SigGeom(Double_t trkTheta,Double_t trkPhi,Double_t thetaC, Double_t phiC,Double_t betaM)
280	{
281	// Analitical calculation of geometric error (due to lack of knowledge of creation point in radiator) on Cerenkov angle for a given Cerenkov photon
282	// created by a given MIP. Formulae according to CERN-EP-2000-058
283	// Arguments: Cerenkov and azimuthal angles for Cerenkov photon, [radians]
284	// dip and azimuthal angles for MIP taken at the entrance to radiator, [radians]
285	// MIP beta
286	// Returns: absolute error on Cerenkov angle, [radians]
287
288	Double_t phiDelta = phiC - trkPhi;
289
290	Double_t sint = TMath::Sin(trkTheta);
291	Double_t cost = TMath::Cos(trkTheta);
292	Double_t sinf = TMath::Sin(trkPhi);
293	Double_t cosfd = TMath::Cos(phiDelta);
294	Double_t costheta = TMath::Cos(thetaC);
295	Double_t tantheta = TMath::Tan(thetaC);
296
297	Double_t alpha =cost-tanthetacosfdsint; // formula (11)
298
299	Double_t k = 1.-GetRefIdx()GetRefIdx()+alphaalpha/(betaM*betaM); // formula (after 8 in the text)
300	if (k<0) return 1e10;
301
302	Double_t eTr = 0.5RadThick()betaMTMath::Sqrt(k)/(GapThick()alpha); // formula (14)
303	Double_t lambda = 1.-sintsintsinf*sinf; // formula (15)
304
305	Double_t c1 = 1./(1.+ eTrk/(alphaalphacosthetacostheta)); // formula (13.a)
306	Double_t c2 = betaMTMath::Power(k,1.5)tanthetalambda/(GapThick()alpha*alpha); // formula (13.b)
307	Double_t c3 = (1.+eTrkbetaMbetaM)/((1+eTr)alpha*alpha); // formula (13.c)
308	Double_t c4 = TMath::Sqrt(k)tantheta(1-lambda)/(GapThick()*betaM); // formula (13.d)
309	Double_t dtdT = c1 * (c2+c3*c4);
310	Double_t trErr = RadThick()/(TMath::Sqrt(12.)*cost);
311
312	return trErr*dtdT;
313	}//SigGeom()
314	//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++