RICH/AliRICHParam.cxx

   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 "AliRICHParam.h" //class header
  16 #include "AliESD.h"
  17 #include <TCanvas.h>      //TestXXX()
  18 #include <TLatex.h>
  19 #include <THStack.h>
  20 #include <TLegend.h>
  21 #include <TView.h>
  22 #include <TPolyMarker3D.h>
  23 #include <TPolyLine3D.h>
  24 #include <TPolyLine.h>
  25 #include <TSystem.h>
  26 #include <TVector2.h>
  27 #include <TVector3.h>
  28 #include <TRotation.h>
  29 #include <AliCDBManager.h> //CdbRead()
  30 #include <AliCDBStorage.h> //CdbRead()
  31 #include <AliCDBEntry.h>   //CdbRead()
  32 #include <AliRunLoader.h>  //Stack()
  33 #include <AliStack.h>      //Stack()
  34 #include <TParticle.h>     //Stack()
  35 #include "AliRICHHelix.h"  //TestTrans()
  36
  37 ClassImp(AliRICHParam)
  38 AliRICHParam * AliRICHParam::fgInstance             =0x0;     //singleton pointer
  39
  40 Double_t AliRICHParam::fgMass[5]              ={0.00051,0.10566,0.13957,0.49360,0.93828};
  41
  42
  43 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  44 AliRICHParam::AliRICHParam():TNamed("RichParam","default version")
  45 {
  46 // Here all the intitializition is taken place when AliRICHParam::Instance() is invoked for the first time.
  47 // In particulare, matrices to be used for LORS<->MARS trasnformations are initialized from TGeo structure.
  48 // Note that TGeoManager should be already initialized from geometry.root file
  49   for(Int_t iCh=0;iCh<kNchambers;iCh++) fMatrix[iCh]=(TGeoHMatrix*)gGeoManager->GetVolume("ALIC")->GetNode(Form("RICH_%i",iCh+1))->GetMatrix();
  50   CdbRead(0,0);
  51   fgInstance=this;
  52 }//ctor
  53 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  54 Float_t AliRICHParam::AbsCH4(Float_t eV)
  55 {
  56 // Evaluate the absorbtion lenght of CH4 for a photon of energy eV in electron-volts
  57   const Float_t kLoschmidt=2.686763e19;                                      // LOSCHMIDT NUMBER IN CM-3
  58   const Float_t kPressure=750.0;          //mm of Hg
  59   const Float_t kTemperature=283.0;       //K (10 grad C)
  60   const Float_t kPn=kPressure/760.;
  61   const Float_t kTn=kTemperature/273.16;
  62   const Float_t kC0=-1.655279e-1;
  63   const Float_t kC1= 6.307392e-2;
  64   const Float_t kC2=-8.011441e-3;
  65   const Float_t kC3= 3.392126e-4;
  66
  67   Float_t crossSection=0;
  68   if (eV<7.75)
  69     crossSection=0.06e-22;
  70   else                 //------ METHANE CROSS SECTION cm-2 ASTROPH. J. 214, L47 (1978)
  71     crossSection=(kC0+kC1*eV+kC2*eV*eV+kC3*eV*eV*eV)*1.e-18;
  72
  73     Float_t density=kLoschmidt*kPn/kTn; //CH4 molecular concentration (cm^-3)
  74     return 1.0/(density*crossSection);
  75 }//AbsoCH4()
  76 //__________________________________________________________________________________________________sss
  77 void AliRICHParam::CdbRead(Int_t run,Int_t version)
  78 {
  79 // This methode read all the calibration information and initialise corresponding fields for requested run number
  80 // Arguments: run - run number for which to retrieve calibration
  81 //            version- version number
  82 //   Returns: none
  83
  84   AliCDBEntry *pEntry=AliCDBManager::Instance()->Get("RICH/RICHConfig/RefIdxC6F14",run,0,version); //try to get from common local storage
  85   if(pEntry){
  86     fIdxC6F14=(TF2*)pEntry->GetObject(); delete pEntry;
  87   }else{
  88     AliWarning("No valid calibarion, the hardcoded will be used!");
  89     fIdxC6F14=new TF2("RidxC4F14","sqrt(1+0.554*(1239.84e-9/x)^2/((1239.84e-9/x)^2-5796)-0.0005*(y-20))",5.5e-9,8.5e-9,0,50); //DiMauro mail
  90     fIdxC6F14->SetUniqueID(20);//T=20 deg C
  91   }
  92 }//CdbRead()
  93 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  94 void AliRICHParam::Print(Option_t* opt) const
  95 {
  96 // print some usefull (hopefully) info on some internal guts of RICH parametrisation
  97   Printf("Pads in chamber (%3i,%3i) in sector (%2i,%2i) pad size (%4.2f,%4.2f)",NpadsX(),NpadsY(),NpadsXsec(),NpadsYsec(),PadSizeX(),PadSizeY());
  98
  99   for(Int_t i=0;i<kNchambers;i++) fMatrix[i]->Print(opt);
 100 }//Print()
 101 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 102 void AliRICHParam::TestSeg()
 103 {
 104 // Provides a set of pictures to test segementation currently in use.
 105 // Arguments: none
 106 //   Returns: none
 107   new TCanvas("pads","PC segmentation - pads display",700,600);
 108   gPad->Range(-5,-5,PcSizeX()+5,PcSizeY()+15);
 109   TVector p(2);   TVector2 c;    TVector2 b;   //current: pad, pad center, pad boundary
 110 // list of corners:
 111   Double_t x0=0,x1=SecSizeX(),x2=SecSizeX()+DeadZone()                                                      ,x3=PcSizeX();
 112   Double_t y0=0,y1=SecSizeY(),y2=SecSizeY()+DeadZone(),y3=2*SecSizeY()+DeadZone(),y4=PcSizeY()-SecSizeY(),y5=PcSizeY();
 113   DrawSectors();
 114 //header
 115   TLatex t;
 116   t.SetTextSize(0.02); t.SetTextColor(kBlack); t.SetTextAlign(11);
 117   t.DrawLatex(0,PcSizeY()+10,Form("IP in front of this page. pad size %.2fx%.2fcm   dead zone %.2fcm",PadSizeX(),PadSizeY(),DeadZone()));
 118   t.DrawLatex(0,PcSizeY()+ 5,Form("Pc  %.2fx%.2f cm %ix%i pads               Sec %.2fx%.2f cm %ix%i pads",
 119                                          PcSizeX()     , PcSizeY()     , NpadsX()    , NpadsY()                                 ,
 120                                          SecSizeX() , SecSizeY() , NpadsXsec() , NpadsYsec()                              ));
 121 //sectors
 122   t.SetTextSize(0.015); t.SetTextColor(kRed); t.SetTextAlign(22);
 123   c=Pad2Loc( 40, 24); t.DrawText(c.X(),c.Y(),Form("sec 1 (%.2f,%.2f)",c.X(),c.Y()  ));
 124   c=Pad2Loc( 40, 75); t.DrawText(c.X(),c.Y(),Form("sec 3 (%.2f,%.2f)",c.X(),c.Y()  ));
 125   c=Pad2Loc( 40,121); t.DrawText(c.X(),c.Y(),Form("sec 5 (%.2f,%.2f)",c.X(),c.Y()  ));
 126   c=Pad2Loc(120, 24); t.DrawText(c.X(),c.Y(),Form("sec 2 (%.2f,%.2f)",c.X(),c.Y()  ));
 127   c=Pad2Loc(120, 75); t.DrawText(c.X(),c.Y(),Form("sec 4 (%.2f,%.2f)",c.X(),c.Y()  ));
 128   c=Pad2Loc(120,121); t.DrawText(c.X(),c.Y(),Form("sec 6 (%.2f,%.2f)",c.X(),c.Y()  ));
 129 //coners
 130   t.SetTextSize(0.015); t.SetTextColor(kBlue);
 131
 132   b.Set(x0,y0);p=Loc2Pad(b);c=Pad2Loc(p);t.SetTextAlign(11);t.DrawText(c.X(),c.Y(),Form("(%.2f,%.2f)-(%.0f,%.0f)-(%.2f,%.2f)",b.X(),b.Y(),p(0),p(1),c.X(),c.Y()));
 133   b.Set(x0,y1);p=Loc2Pad(b);c=Pad2Loc(p);t.SetTextAlign(13);t.DrawText(c.X(),c.Y(),Form("(%.2f,%.2f)-(%.0f,%.0f)-(%.2f,%.2f)",b.X(),b.Y(),p(0),p(1),c.X(),c.Y()));
 134   b.Set(x0,y2);p=Loc2Pad(b);c=Pad2Loc(p);t.SetTextAlign(11);t.DrawText(c.X(),c.Y(),Form("(%.2f,%.2f)-(%.0f,%.0f)-(%.2f,%.2f)",b.X(),b.Y(),p(0),p(1),c.X(),c.Y()));
 135   b.Set(x0,y3);p=Loc2Pad(b);c=Pad2Loc(p);t.SetTextAlign(13);t.DrawText(c.X(),c.Y(),Form("(%.2f,%.2f)-(%.0f,%.0f)-(%.2f,%.2f)",b.X(),b.Y(),p(0),p(1),c.X(),c.Y()));
 136   b.Set(x0,y4);p=Loc2Pad(b);c=Pad2Loc(p);t.SetTextAlign(11);t.DrawText(c.X(),c.Y(),Form("(%.2f,%.2f)-(%.0f,%.0f)-(%.2f,%.2f)",b.X(),b.Y(),p(0),p(1),c.X(),c.Y()));
 137   b.Set(x0,y5);p=Loc2Pad(b);c=Pad2Loc(p);t.SetTextAlign(13);t.DrawText(c.X(),c.Y(),Form("(%.2f,%.2f)-(%.0f,%.0f)-(%.2f,%.2f)",b.X(),b.Y(),p(0),p(1),c.X(),c.Y()));
 138
 139   b.Set(x1,y0);p=Loc2Pad(b);c=Pad2Loc(p);t.SetTextAlign(31);t.DrawText(c.X(),c.Y(),Form("(%.2f,%.2f)-(%.0f,%.0f)-(%.2f,%.2f)",b.X(),b.Y(),p(0),p(1),c.X(),c.Y()));
 140   b.Set(x1,y1);p=Loc2Pad(b);c=Pad2Loc(p);t.SetTextAlign(33);t.DrawText(c.X(),c.Y(),Form("(%.2f,%.2f)-(%.0f,%.0f)-(%.2f,%.2f)",b.X(),b.Y(),p(0),p(1),c.X(),c.Y()));
 141   b.Set(x1,y2);p=Loc2Pad(b);c=Pad2Loc(p);t.SetTextAlign(31);t.DrawText(c.X(),c.Y(),Form("(%.2f,%.2f)-(%.0f,%.0f)-(%.2f,%.2f)",b.X(),b.Y(),p(0),p(1),c.X(),c.Y()));
 142   b.Set(x1,y3);p=Loc2Pad(b);c=Pad2Loc(p);t.SetTextAlign(33);t.DrawText(c.X(),c.Y(),Form("(%.2f,%.2f)-(%.0f,%.0f)-(%.2f,%.2f)",b.X(),b.Y(),p(0),p(1),c.X(),c.Y()));
 143   b.Set(x1,y4);p=Loc2Pad(b);c=Pad2Loc(p);t.SetTextAlign(31);t.DrawText(c.X(),c.Y(),Form("(%.2f,%.2f)-(%.0f,%.0f)-(%.2f,%.2f)",b.X(),b.Y(),p(0),p(1),c.X(),c.Y()));
 144   b.Set(x1,y5);p=Loc2Pad(b);c=Pad2Loc(p);t.SetTextAlign(33);t.DrawText(c.X(),c.Y(),Form("(%.2f,%.2f)-(%.0f,%.0f)-(%.2f,%.2f)",b.X(),b.Y(),p(0),p(1),c.X(),c.Y()));
 145
 146   b.Set(x2,y0);p=Loc2Pad(b);c=Pad2Loc(p);t.SetTextAlign(11);t.DrawText(c.X(),c.Y(),Form("(%.2f,%.2f)-(%.0f,%.0f)-(%.2f,%.2f)",b.X(),b.Y(),p(0),p(1),c.X(),c.Y()));
 147   b.Set(x2,y1);p=Loc2Pad(b);c=Pad2Loc(p);t.SetTextAlign(13);t.DrawText(c.X(),c.Y(),Form("(%.2f,%.2f)-(%.0f,%.0f)-(%.2f,%.2f)",b.X(),b.Y(),p(0),p(1),c.X(),c.Y()));
 148   b.Set(x2,y2);p=Loc2Pad(b);c=Pad2Loc(p);t.SetTextAlign(11);t.DrawText(c.X(),c.Y(),Form("(%.2f,%.2f)-(%.0f,%.0f)-(%.2f,%.2f)",b.X(),b.Y(),p(0),p(1),c.X(),c.Y()));
 149   b.Set(x2,y3);p=Loc2Pad(b);c=Pad2Loc(p);t.SetTextAlign(13);t.DrawText(c.X(),c.Y(),Form("(%.2f,%.2f)-(%.0f,%.0f)-(%.2f,%.2f)",b.X(),b.Y(),p(0),p(1),c.X(),c.Y()));
 150   b.Set(x2,y4);p=Loc2Pad(b);c=Pad2Loc(p);t.SetTextAlign(11);t.DrawText(c.X(),c.Y(),Form("(%.2f,%.2f)-(%.0f,%.0f)-(%.2f,%.2f)",b.X(),b.Y(),p(0),p(1),c.X(),c.Y()));
 151   b.Set(x2,y5);p=Loc2Pad(b);c=Pad2Loc(p);t.SetTextAlign(13);t.DrawText(c.X(),c.Y(),Form("(%.2f,%.2f)-(%.0f,%.0f)-(%.2f,%.2f)",b.X(),b.Y(),p(0),p(1),c.X(),c.Y()));
 152
 153   b.Set(x3,y0);p=Loc2Pad(b);c=Pad2Loc(p);t.SetTextAlign(31);t.DrawText(c.X(),c.Y(),Form("(%.2f,%.2f)-(%.0f,%.0f)-(%.2f,%.2f)",b.X(),b.Y(),p(0),p(1),c.X(),c.Y()));
 154   b.Set(x3,y1);p=Loc2Pad(b);c=Pad2Loc(p);t.SetTextAlign(33);t.DrawText(c.X(),c.Y(),Form("(%.2f,%.2f)-(%.0f,%.0f)-(%.2f,%.2f)",b.X(),b.Y(),p(0),p(1),c.X(),c.Y()));
 155   b.Set(x3,y2);p=Loc2Pad(b);c=Pad2Loc(p);t.SetTextAlign(31);t.DrawText(c.X(),c.Y(),Form("(%.2f,%.2f)-(%.0f,%.0f)-(%.2f,%.2f)",b.X(),b.Y(),p(0),p(1),c.X(),c.Y()));
 156   b.Set(x3,y3);p=Loc2Pad(b);c=Pad2Loc(p);t.SetTextAlign(33);t.DrawText(c.X(),c.Y(),Form("(%.2f,%.2f)-(%.0f,%.0f)-(%.2f,%.2f)",b.X(),b.Y(),p(0),p(1),c.X(),c.Y()));
 157   b.Set(x3,y4);p=Loc2Pad(b);c=Pad2Loc(p);t.SetTextAlign(31);t.DrawText(c.X(),c.Y(),Form("(%.2f,%.2f)-(%.0f,%.0f)-(%.2f,%.2f)",b.X(),b.Y(),p(0),p(1),c.X(),c.Y()));
 158   b.Set(x3,y5);p=Loc2Pad(b);c=Pad2Loc(p);t.SetTextAlign(33);t.DrawText(c.X(),c.Y(),Form("(%.2f,%.2f)-(%.0f,%.0f)-(%.2f,%.2f)",b.X(),b.Y(),p(0),p(1),c.X(),c.Y()));
 159 }//TestSeg()
 160 //__________________________________________________________________________________________________
 161 void AliRICHParam::TestResp()
 162 {
 163 // Provides a set of plot to check the response parametrisation currently in use.
 164 // Arguments: none
 165 //   Returns: none
 166   TCanvas *pC=new TCanvas("c","Amplification test",900,800);
 167   pC->Divide(1,2);
 168
 169
 170   const Int_t kNpoints=8;
 171   THStack *pStackPhot=new THStack("StackPhot","photons");
 172   THStack *pStackMip =new THStack("StackMip","mips");
 173   TLegend *pLeg=new TLegend(0.6,0.2,0.9,0.5,"legend");
 174   TH1F *apHphot[kNpoints];
 175   TH1F *apHmip[kNpoints];
 176
 177   Double_t starty=0;
 178   Double_t deltay=AliRICHParam::SecSizeY()/kNpoints;
 179
 180   for(int i=0;i<kNpoints;i++){
 181     apHphot[i]=new TH1F(Form("hphot%i",i),"Qdc for Photon;QDC;Counts",500,0,500); apHphot[i]->SetLineColor(i);pStackPhot->Add(apHphot[i]);
 182     apHmip[i] =new TH1F(Form("hmip%i",i),"Qdc for Mip;QDC;Counts",4000,0,4000);   apHmip[i]->SetLineColor(i);pStackMip->Add(apHmip[i]);
 183
 184     pLeg->AddEntry(apHphot[i],Form("@(10,%5.2f->%5.2f)",starty+i*deltay,starty+i*deltay-SecSizeY()/2));
 185   }
 186
 187
 188   TVector2 x2(0,0);
 189   for(Int_t i=0;i<10000;i++){//events loop
 190     for(int j=0;j<kNpoints;j++){
 191       x2.Set(10,starty+j*deltay);
 192       apHphot[j]->Fill(TotQdc(x2,0));
 193       apHmip[j]->Fill(TotQdc(x2,gRandom->Landau(600,150)*1e-9));
 194     }
 195   }
 196
 197   pC->cd(1);  pStackMip->Draw("nostack");
 198   pC->cd(2);  pStackPhot->Draw("nostack"); pLeg->Draw();
 199 }//TestResp()
 200 //__________________________________________________________________________________________________
 201 void AliRICHParam::TestTrans()
 202 {
 203 // Tests transformation methods
 204 // Arguments: none
 205 //   Returns: none
 206
 207   AliRICHParam *pParam=AliRICHParam::Instance();
 208   Int_t iNpointsX=50,iNpointsY=50;
 209   new TCanvas("trasform","Test LORS-MARS transform"); TLatex t; t.SetTextSize(0.02);
 210
 211   TView *pView=new TView(1);  pView->SetRange(-400,-400,-400,400,400,400);
 212   DrawAxis();
 213   for(Int_t iCham=1;iCham<=7;iCham++){//chamber loop
 214     AliRICHHelix helix(2.5,Norm(iCham).Theta()*TMath::RadToDeg(),Norm(iCham).Phi()*TMath::RadToDeg());
 215     helix.RichIntersect(AliRICHParam::Instance());
 216     TPolyMarker3D *pChamber=new TPolyMarker3D(iNpointsX*iNpointsY);
 217     Int_t i=0;
 218     for(Double_t x=0;x<PcSizeX();x+=PcSizeX()/iNpointsX)
 219       for(Double_t y=0;y<PcSizeY();y+=PcSizeY()/iNpointsY){//step loop
 220         TVector3 v3=pParam->Lors2Mars(iCham,x,y,kPc); TVector2 v2=pParam->Mars2Lors(iCham,v3,kPc);//LORS->MARS->LORS
 221         Double_t dx=v2.X()-x , dy=v2.Y()-y;
 222         if(dx>0.000001 || dy>0.000001) Printf("Problem in MARS<->LORS transformations dx=%f dy=%f!!!",dx,dy);
 223         pChamber->SetPoint(i++,v3.X(),v3.Y(),v3.Z());//Pc plane point in MARS
 224       }//step loop
 225     pChamber->SetMarkerSize(1);
 226     pChamber->SetMarkerColor(iCham);
 227     pChamber->Draw();
 228     helix.Draw();
 229     t.SetNDC();t.SetTextColor(iCham); t.DrawText(0.1,iCham*0.1,Form("Chamber %i",iCham));
 230   }//chambers loop
 231 }//TestTrans()
 232 //__________________________________________________________________________________________________
 233 void AliRICHParam::DrawAxis()
 234 {
 235 // This utility methode draws axis on geometry scene
 236 // Arguments: none
 237 //   Returns: none
 238   Double_t x[6]={0,0,0,300,0,0};  Double_t y[6]={0,0,0,0,300,0};  Double_t z[6]={0,0,0,0,0,300};
 239   TPolyLine3D *pXaxis=new TPolyLine3D(2,x);pXaxis->SetLineColor(kRed);   pXaxis->Draw();
 240   TPolyLine3D *pYaxis=new TPolyLine3D(2,y);pYaxis->SetLineColor(kGreen); pYaxis->Draw();
 241   TPolyLine3D *pZaxis=new TPolyLine3D(2,z);pZaxis->SetLineColor(kBlue);  pZaxis->Draw();
 242 }
 243 //__________________________________________________________________________________________________
 244 void AliRICHParam::DrawSectors()
 245 {
 246 // Utility methode draws RICH chamber sectors on event display.
 247 // Arguments: none
 248 //   Returns: none
 249   Double_t xLeft[5]  = {0,0,SecSizeX(),SecSizeX(),0};
 250   Double_t xRight[5] = {SecSizeX()+DeadZone(),SecSizeX()+DeadZone(),PcSizeX(),PcSizeX(),SecSizeX()+DeadZone()};
 251
 252   Double_t yDown[5]   = {0,SecSizeY(),SecSizeY(),0,0};
 253   Double_t yCenter[5] = {  SecSizeY()+DeadZone(),2*SecSizeY()+DeadZone(),2*SecSizeY()+DeadZone(),
 254                            SecSizeY()+DeadZone(),SecSizeY()+DeadZone()};
 255   Double_t yUp[5]     = {2*SecSizeY()+2*DeadZone(),PcSizeY(),PcSizeY(),2*SecSizeY()+2*DeadZone(),2*SecSizeY()+2*DeadZone()};
 256
 257   TPolyLine *sec1 = new TPolyLine(5,xLeft ,yDown);    sec1->SetLineColor(21);  sec1->Draw();
 258   TPolyLine *sec2 = new TPolyLine(5,xRight,yDown);    sec2->SetLineColor(21);  sec2->Draw();
 259   TPolyLine *sec3 = new TPolyLine(5,xLeft ,yCenter);  sec3->SetLineColor(21);  sec3->Draw();
 260   TPolyLine *sec4 = new TPolyLine(5,xRight,yCenter);  sec4->SetLineColor(21);  sec4->Draw();
 261   TPolyLine *sec5 = new TPolyLine(5,xLeft, yUp);      sec5->SetLineColor(21);  sec5->Draw();
 262   TPolyLine *sec6 = new TPolyLine(5,xRight,yUp);      sec6->SetLineColor(21);  sec6->Draw();
 263 }//DrawSectors()
 264 //__________________________________________________________________________________________________
 265 TVector3 AliRICHParam::ForwardTracing(TVector3 entranceTrackPoint, TVector3 vectorTrack, Double_t thetaC, Double_t phiC)
 266 {
 267 // Trace a single Ckov photon from a given emission point up to photocathode taking into account ref indexes of materials it travereses
 268   TVector3 vBad(-999,-999,-999);
 269   TVector3 nPlane(0,0,1);
 270   Double_t planeZposition = 0.5*RadThick();
 271   TVector3 planePoint(0,0,0.5*RadThick()); //this is plane parallel to window which contains emission point
 272   TVector3 emissionPoint = PlaneIntersect(vectorTrack,entranceTrackPoint,nPlane,planePoint);
 273   Double_t thetaout,phiout;
 274   AnglesInDRS(vectorTrack.Theta(),vectorTrack.Phi(),thetaC,phiC,thetaout,phiout);
 275   TVector3 vectorPhotonInC6F14;
 276   vectorPhotonInC6F14.SetMagThetaPhi(1,thetaout,phiout);
 277   planeZposition=RadThick();
 278   planePoint.SetXYZ(0,0,planeZposition);
 279   TVector3 entranceToSiO2Point = PlaneIntersect(vectorPhotonInC6F14,emissionPoint,nPlane,planePoint);
 280
 281   Double_t photonEn = EckovMean();
 282   Double_t angleInSiO2 = SnellAngle(IdxC6F14(EckovMean()),IdxSiO2(EckovMean()),vectorPhotonInC6F14.Theta());if(angleInSiO2<0) return vBad;
 283   TVector3 vectorPhotonInSiO2;
 284   vectorPhotonInSiO2.SetMagThetaPhi(1,angleInSiO2,phiout);
 285 //  planeZposition+=AliRICHParam::SiO2Thickness();
 286   planeZposition+=WinThick();
 287   planePoint.SetXYZ(0,0,planeZposition);
 288   TVector3 entranceToCH4 = PlaneIntersect(vectorPhotonInSiO2,entranceToSiO2Point,nPlane,planePoint);
 289 //  entranceToCH4.Dump();
 290
 291   //  Double_t angleInCH4 = SnellAngle(AliRICHParam::IndOfRefSiO2(6.755),AliRICHParam::IndOfRefCH4,angleInSiO2);
 292   Double_t angleInCH4 = SnellAngle(IdxSiO2(photonEn),IdxCH4(photonEn),vectorPhotonInSiO2.Theta());if(angleInCH4<0) return vBad;
 293   TVector3 vectorPhotonInCH4;
 294   vectorPhotonInCH4.SetMagThetaPhi(1,angleInCH4,phiout);
 295 //  planeZposition+=AliRICHParam::GapProx();
 296   planeZposition+=Pc2Win();
 297   planePoint.SetXYZ(0,0,planeZposition);
 298   TVector3 impactToPC = PlaneIntersect(vectorPhotonInCH4,entranceToCH4,nPlane,planePoint);
 299 //  impactToPC.Dump();
 300   return impactToPC;
 301 }//FowardTracing
 302 //__________________________________________________________________________________________________
 303 TVector3 AliRICHParam::PlaneIntersect(const TVector3 &lineDir,const TVector3 &linePoint,const TVector3 &planeNorm,const TVector3 &planePoint)
 304 {
 305 // Finds an intersection point between a line and plane.
 306 // Arguments:  lineDir,linePoint    - vector along the line and any point of the line
 307 //             planeNorm,planePoint - vector normal to the plane and any point of the plane
 308 //   Returns:  point of intersection if any
 309   if(planeNorm*lineDir==0) return   TVector3(-999,-999,-999);
 310   TVector3 diff=planePoint-linePoint;
 311   Double_t sint=(planeNorm*diff)/(planeNorm*lineDir);
 312   return linePoint+sint*lineDir;
 313 }//PlaneIntersect
 314 //__________________________________________________________________________________________________
 315 Double_t AliRICHParam::SnellAngle(Float_t n1, Float_t n2, Float_t theta1)
 316 {
 317 // Compute the angle of refraction out of Snell law
 318 // Arguments: n1 - ref idx of first substance
 319 //            n2 - ref idx of second substance
 320 //            n1 - photon impact angle in the first substance i.e. angle between the photon direction and vector normal to the surface (radians)
 321 //   Returns: photon refraction angle, i.e. angle in the second substance (radians)
 322   Double_t sinref=(n1/n2)*TMath::Sin(theta1);
 323   if(sinref>1.)    return -999;
 324   else             return TMath::ASin(sinref);
 325 }//SnellAngle
 326 //__________________________________________________________________________________________________
 327 void AliRICHParam::AnglesInDRS(Double_t trackTheta,Double_t trackPhi,Double_t thetaCerenkov,Double_t phiCerenkov,Double_t &tout,Double_t &pout)
 328 {
 329 // Setup the rotation matrix of the track...
 330
 331   TRotation mtheta;
 332   TRotation mphi;
 333   TRotation minv;
 334   TRotation mrot;
 335
 336   mtheta.RotateY(trackTheta);
 337   mphi.RotateZ(trackPhi);
 338
 339   mrot = mphi * mtheta;
 340     //  minv = mrot.Inverse();
 341
 342   TVector3 photonInRadiator(1,1,1);
 343
 344   photonInRadiator.SetTheta(thetaCerenkov);
 345   photonInRadiator.SetPhi(phiCerenkov);
 346   photonInRadiator = mrot * photonInRadiator;
 347   tout=photonInRadiator.Theta();
 348   pout=photonInRadiator.Phi();
 349 }//AnglesInDRS
 350 /*
 351 void DrawRing()
 352 {
 353
 354   //  Float_t xGraph[1000],yGraph[1000];
 355
 356   Float_t type;
 357   Float_t MassOfParticle;
 358   Float_t beta;
 359   Float_t nfreon;
 360
 361   Float_t ThetaCerenkov;
 362
 363   Float_t Xtoentr = GetEntranceX();
 364   Float_t Ytoentr = GetEntranceY();
 365
 366   Float_t pmod = GetTrackMomentum();
 367   Float_t TrackTheta = GetTrackTheta();
 368   Float_t TrackPhi = GetTrackPhi();
 369
 370   SetPhotonEnergy(AliRICHParam::MeanCkovEnergy());
 371   SetFreonRefractiveIndex();
 372
 373   SetEmissionPoint(RadiatorWidth/2.);
 374
 375   ThetaCerenkov = GetThetaCerenkov();
 376   FindBetaFromTheta(ThetaCerenkov);
 377   nfreon = GetFreonRefractiveIndex();
 378
 379   Int_t nPoints = 100;
 380
 381   Int_t nPointsToDraw = 0;
 382   for(Int_t i=0;i<nPoints;i++)
 383     {
 384       Float_t phpad = 2*TMath::Pi()*i/nPoints;
 385       SetThetaPhotonInTRS(thetacer);
 386       SetPhiPhotonInTRS(phpad);
 387       FindPhotonAnglesInDRS();
 388       Float_t Radius = FromEmissionToCathode();
 389       if (Radius == 999.) continue;
 390       xGraph[nPointsToDraw] = GetXPointOnCathode() + GetShiftX();
 391       yGraph[nPointsToDraw] = GetYPointOnCathode() + GetShiftY();
 392       nPointsToDraw++;
 393     }
 394   gra = new TGraph(nPointsToDraw,xGraph,yGraph);
 395   gra->Draw("AC");
 396 }
 397 //__________________________________________________________________________________________________
 398 */
 399 void AliRICHParam::TestHit2SDigs(Double_t x,Double_t y,Double_t e,Bool_t isNew)
 400 {
 401 //Test  hit->sdigits procedures
 402 //Arguments: isNew - if true use new (abs pad) procedure else use old one (TVector)
 403 //  Returns: none
 404   TClonesArray *pSDigLst=new TClonesArray("AliRICHDigit");
 405   Int_t iQtot=-1;
 406   if(isNew){
 407     iQtot=Hit2SDigs(10101,e,pSDigLst);        //new technique
 408   }else{
 409     iQtot=Hit2SDigs(TVector2(x,y),e,pSDigLst);//old technique
 410   }
 411   pSDigLst->Print();
 412   Double_t dQsum=0;
 413   for(Int_t i=0;i<pSDigLst->GetEntriesFast();i++)
 414     dQsum+=((AliRICHDigit*)pSDigLst->At(i))->Qdc();
 415   Printf("Qtot=%i Qsum=%.2f ",iQtot,dQsum);
 416 }
 417 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 418 Int_t AliRICHParam::Stack(Int_t evt,Int_t tid)
 419 {
 420 // Prints some usefull info from stack
 421 // Arguments: evt - event number. if not -1 print info only for that event
 422 //            tid - track id. if not -1 then print it and all it's mothers if any
 423 //   Returns: mother tid of the given tid if any
 424   AliRunLoader *pAL=AliRunLoader::Open();
 425   if(pAL->LoadHeader()) return -1;
 426   if(pAL->LoadKinematics()) return -1;
 427
 428   Int_t mtid=-1;
 429   Int_t iNevt=pAL->GetNumberOfEvents();     Printf("This session contains %i event(s)",iNevt);
 430
 431   for(Int_t iEvt=0;iEvt<iNevt;iEvt++){//events loop
 432     if(evt!=-1 && evt!=iEvt) continue; //in case one needs to print the requested event, ignore all others
 433     pAL->GetEvent(iEvt);
 434     AliStack *pStack=pAL->Stack();
 435     if(tid==-1){                        //print all tids for this event
 436       for(Int_t i=0;i<pStack->GetNtrack();i++) pStack->Particle(i)->Print();
 437       Printf("totally %i tracks including %i primaries for event %i out of %i event(s)",pStack->GetNtrack(),pStack->GetNprimary(),iEvt,iNevt);
 438     }else{                              //print only this tid and it;s mothers
 439       if(tid<0 || tid>pStack->GetNtrack()) {Printf("Wrong tid, valid tid range for event %i is 0-%i",iEvt,pStack->GetNtrack());break;}
 440       TParticle *pTrack=pStack->Particle(tid); mtid=pTrack->GetFirstMother();
 441       TString str=pTrack->GetName();
 442       while((tid=pTrack->GetFirstMother()) >= 0){
 443         pTrack=pStack->Particle(tid);
 444         str+=" from ";str+=pTrack->GetName();
 445       }
 446       Printf("%s",str.Data());
 447     }//if(tid==-1)
 448   }//events loop
 449   pAL->UnloadHeader();  pAL->UnloadKinematics();
 450   return mtid;
 451 }
 452 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 453 Int_t AliRICHParam::StackCount(Int_t pid,Int_t evt)
 454 {
 455 // Counts total number of particles of given sort (including secondary) for a given event
 456   AliRunLoader *pAL=AliRunLoader::Open();
 457   pAL->GetEvent(evt);
 458   if(pAL->LoadHeader()) return 0;
 459   if(pAL->LoadKinematics()) return 0;
 460   AliStack *pStack=pAL->Stack();
 461
 462   Int_t iCnt=0;
 463   for(Int_t i=0;i<pStack->GetNtrack();i++) if(pStack->Particle(i)->GetPdgCode()==pid) iCnt++;
 464
 465   pAL->UnloadHeader();  pAL->UnloadKinematics();
 466   return iCnt;
 467 }
 468 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++