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();
  87     if(!(AliCDBManager::Instance()->GetCacheFlag())) delete pEntry;
  88   }else{
  89     AliWarning("No valid calibarion, the hardcoded will be used!");
  90     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
  91     fIdxC6F14->SetUniqueID(20);//T=20 deg C
  92   }
  93 }//CdbRead()
  94 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  95 void AliRICHParam::Print(Option_t* opt) const
  96 {
  97 // print some usefull (hopefully) info on some internal guts of RICH parametrisation
  98   Printf("Pads in chamber (%3i,%3i) in sector (%2i,%2i) pad size (%4.2f,%4.2f)",NpadsX(),NpadsY(),NpadsXsec(),NpadsYsec(),PadSizeX(),PadSizeY());
  99
 100   for(Int_t i=0;i<kNchambers;i++) fMatrix[i]->Print(opt);
 101 }//Print()
 102 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 103 void AliRICHParam::TestSeg()
 104 {
 105 // Provides a set of pictures to test segementation currently in use.
 106 // Arguments: none
 107 //   Returns: none
 108   new TCanvas("pads","PC segmentation - pads display",700,600);
 109   gPad->Range(-5,-5,PcSizeX()+5,PcSizeY()+15);
 110   TVector p(2);   TVector2 c;    TVector2 b;   //current: pad, pad center, pad boundary
 111 // list of corners:
 112   Double_t x0=0,x1=SecSizeX(),x2=SecSizeX()+DeadZone()                                                      ,x3=PcSizeX();
 113   Double_t y0=0,y1=SecSizeY(),y2=SecSizeY()+DeadZone(),y3=2*SecSizeY()+DeadZone(),y4=PcSizeY()-SecSizeY(),y5=PcSizeY();
 114   DrawSectors();
 115 //header
 116   TLatex t;
 117   t.SetTextSize(0.02); t.SetTextColor(kBlack); t.SetTextAlign(11);
 118   t.DrawLatex(0,PcSizeY()+10,Form("IP in front of this page. pad size %.2fx%.2fcm   dead zone %.2fcm",PadSizeX(),PadSizeY(),DeadZone()));
 119   t.DrawLatex(0,PcSizeY()+ 5,Form("Pc  %.2fx%.2f cm %ix%i pads               Sec %.2fx%.2f cm %ix%i pads",
 120                                          PcSizeX()     , PcSizeY()     , NpadsX()    , NpadsY()                                 ,
 121                                          SecSizeX() , SecSizeY() , NpadsXsec() , NpadsYsec()                              ));
 122 //sectors
 123   t.SetTextSize(0.015); t.SetTextColor(kRed); t.SetTextAlign(22);
 124   c=Pad2Loc( 40, 24); t.DrawText(c.X(),c.Y(),Form("sec 1 (%.2f,%.2f)",c.X(),c.Y()  ));
 125   c=Pad2Loc( 40, 75); t.DrawText(c.X(),c.Y(),Form("sec 3 (%.2f,%.2f)",c.X(),c.Y()  ));
 126   c=Pad2Loc( 40,121); t.DrawText(c.X(),c.Y(),Form("sec 5 (%.2f,%.2f)",c.X(),c.Y()  ));
 127   c=Pad2Loc(120, 24); t.DrawText(c.X(),c.Y(),Form("sec 2 (%.2f,%.2f)",c.X(),c.Y()  ));
 128   c=Pad2Loc(120, 75); t.DrawText(c.X(),c.Y(),Form("sec 4 (%.2f,%.2f)",c.X(),c.Y()  ));
 129   c=Pad2Loc(120,121); t.DrawText(c.X(),c.Y(),Form("sec 6 (%.2f,%.2f)",c.X(),c.Y()  ));
 130 //coners
 131   t.SetTextSize(0.015); t.SetTextColor(kBlue);
 132
 133   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()));
 134   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()));
 135   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()));
 136   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()));
 137   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()));
 138   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()));
 139
 140   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()));
 141   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()));
 142   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()));
 143   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()));
 144   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()));
 145   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()));
 146
 147   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()));
 148   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()));
 149   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()));
 150   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()));
 151   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()));
 152   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()));
 153
 154   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()));
 155   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()));
 156   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()));
 157   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()));
 158   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()));
 159   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()));
 160 }//TestSeg()
 161 //__________________________________________________________________________________________________
 162 void AliRICHParam::TestResp()
 163 {
 164 // Provides a set of plot to check the response parametrisation currently in use.
 165 // Arguments: none
 166 //   Returns: none
 167   TCanvas *pC=new TCanvas("c","Amplification test",900,800);
 168   pC->Divide(1,2);
 169
 170
 171   const Int_t kNpoints=8;
 172   THStack *pStackPhot=new THStack("StackPhot","photons");
 173   THStack *pStackMip =new THStack("StackMip","mips");
 174   TLegend *pLeg=new TLegend(0.6,0.2,0.9,0.5,"legend");
 175   TH1F *apHphot[kNpoints];
 176   TH1F *apHmip[kNpoints];
 177
 178   Double_t starty=0;
 179   Double_t deltay=AliRICHParam::SecSizeY()/kNpoints;
 180
 181   for(int i=0;i<kNpoints;i++){
 182     apHphot[i]=new TH1F(Form("hphot%i",i),"Qdc for Photon;QDC;Counts",500,0,500); apHphot[i]->SetLineColor(i);pStackPhot->Add(apHphot[i]);
 183     apHmip[i] =new TH1F(Form("hmip%i",i),"Qdc for Mip;QDC;Counts",4000,0,4000);   apHmip[i]->SetLineColor(i);pStackMip->Add(apHmip[i]);
 184
 185     pLeg->AddEntry(apHphot[i],Form("@(10,%5.2f->%5.2f)",starty+i*deltay,starty+i*deltay-SecSizeY()/2));
 186   }
 187
 188
 189   TVector2 x2(0,0);
 190   for(Int_t i=0;i<10000;i++){//events loop
 191     for(int j=0;j<kNpoints;j++){
 192       x2.Set(10,starty+j*deltay);
 193       apHphot[j]->Fill(TotQdc(x2,0));
 194       apHmip[j]->Fill(TotQdc(x2,gRandom->Landau(600,150)*1e-9));
 195     }
 196   }
 197
 198   pC->cd(1);  pStackMip->Draw("nostack");
 199   pC->cd(2);  pStackPhot->Draw("nostack"); pLeg->Draw();
 200 }//TestResp()
 201 //__________________________________________________________________________________________________
 202 void AliRICHParam::TestTrans()
 203 {
 204 // Tests transformation methods
 205 // Arguments: none
 206 //   Returns: none
 207
 208   AliRICHParam *pParam=AliRICHParam::Instance();
 209   Int_t iNpointsX=50,iNpointsY=50;
 210   new TCanvas("trasform","Test LORS-MARS transform"); TLatex t; t.SetTextSize(0.02);
 211
 212   TView *pView=new TView(1);  pView->SetRange(-400,-400,-400,400,400,400);
 213   DrawAxis();
 214   for(Int_t iCham=1;iCham<=7;iCham++){//chamber loop
 215     AliRICHHelix helix(2.5,Norm(iCham).Theta()*TMath::RadToDeg(),Norm(iCham).Phi()*TMath::RadToDeg());
 216     helix.RichIntersect(AliRICHParam::Instance());
 217     TPolyMarker3D *pChamber=new TPolyMarker3D(iNpointsX*iNpointsY);
 218     Int_t i=0;
 219     for(Double_t x=0;x<PcSizeX();x+=PcSizeX()/iNpointsX)
 220       for(Double_t y=0;y<PcSizeY();y+=PcSizeY()/iNpointsY){//step loop
 221         TVector3 v3=pParam->Lors2Mars(iCham,x,y,kPc); TVector2 v2=pParam->Mars2Lors(iCham,v3,kPc);//LORS->MARS->LORS
 222         Double_t dx=v2.X()-x , dy=v2.Y()-y;
 223         if(dx>0.000001 || dy>0.000001) Printf("Problem in MARS<->LORS transformations dx=%f dy=%f!!!",dx,dy);
 224         pChamber->SetPoint(i++,v3.X(),v3.Y(),v3.Z());//Pc plane point in MARS
 225       }//step loop
 226     pChamber->SetMarkerSize(1);
 227     pChamber->SetMarkerColor(iCham);
 228     pChamber->Draw();
 229     helix.Draw();
 230     t.SetNDC();t.SetTextColor(iCham); t.DrawText(0.1,iCham*0.1,Form("Chamber %i",iCham));
 231   }//chambers loop
 232 }//TestTrans()
 233 //__________________________________________________________________________________________________
 234 void AliRICHParam::DrawAxis()
 235 {
 236 // This utility methode draws axis on geometry scene
 237 // Arguments: none
 238 //   Returns: none
 239   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};
 240   TPolyLine3D *pXaxis=new TPolyLine3D(2,x);pXaxis->SetLineColor(kRed);   pXaxis->Draw();
 241   TPolyLine3D *pYaxis=new TPolyLine3D(2,y);pYaxis->SetLineColor(kGreen); pYaxis->Draw();
 242   TPolyLine3D *pZaxis=new TPolyLine3D(2,z);pZaxis->SetLineColor(kBlue);  pZaxis->Draw();
 243 }
 244 //__________________________________________________________________________________________________
 245 void AliRICHParam::DrawSectors()
 246 {
 247 // Utility methode draws RICH chamber sectors on event display.
 248 // Arguments: none
 249 //   Returns: none
 250   Double_t xLeft[5]  = {0,0,SecSizeX(),SecSizeX(),0};
 251   Double_t xRight[5] = {SecSizeX()+DeadZone(),SecSizeX()+DeadZone(),PcSizeX(),PcSizeX(),SecSizeX()+DeadZone()};
 252
 253   Double_t yDown[5]   = {0,SecSizeY(),SecSizeY(),0,0};
 254   Double_t yCenter[5] = {  SecSizeY()+DeadZone(),2*SecSizeY()+DeadZone(),2*SecSizeY()+DeadZone(),
 255                            SecSizeY()+DeadZone(),SecSizeY()+DeadZone()};
 256   Double_t yUp[5]     = {2*SecSizeY()+2*DeadZone(),PcSizeY(),PcSizeY(),2*SecSizeY()+2*DeadZone(),2*SecSizeY()+2*DeadZone()};
 257
 258   TPolyLine *sec1 = new TPolyLine(5,xLeft ,yDown);    sec1->SetLineColor(21);  sec1->Draw();
 259   TPolyLine *sec2 = new TPolyLine(5,xRight,yDown);    sec2->SetLineColor(21);  sec2->Draw();
 260   TPolyLine *sec3 = new TPolyLine(5,xLeft ,yCenter);  sec3->SetLineColor(21);  sec3->Draw();
 261   TPolyLine *sec4 = new TPolyLine(5,xRight,yCenter);  sec4->SetLineColor(21);  sec4->Draw();
 262   TPolyLine *sec5 = new TPolyLine(5,xLeft, yUp);      sec5->SetLineColor(21);  sec5->Draw();
 263   TPolyLine *sec6 = new TPolyLine(5,xRight,yUp);      sec6->SetLineColor(21);  sec6->Draw();
 264 }//DrawSectors()
 265 //__________________________________________________________________________________________________
 266 TVector3 AliRICHParam::ForwardTracing(TVector3 entranceTrackPoint, TVector3 vectorTrack, Double_t thetaC, Double_t phiC)
 267 {
 268 // Trace a single Ckov photon from a given emission point up to photocathode taking into account ref indexes of materials it travereses
 269   TVector3 vBad(-999,-999,-999);
 270   TVector3 nPlane(0,0,1);
 271   Double_t planeZposition = 0.5*RadThick();
 272   TVector3 planePoint(0,0,0.5*RadThick()); //this is plane parallel to window which contains emission point
 273   TVector3 emissionPoint = PlaneIntersect(vectorTrack,entranceTrackPoint,nPlane,planePoint);
 274   Double_t thetaout,phiout;
 275   AnglesInDRS(vectorTrack.Theta(),vectorTrack.Phi(),thetaC,phiC,thetaout,phiout);
 276   TVector3 vectorPhotonInC6F14;
 277   vectorPhotonInC6F14.SetMagThetaPhi(1,thetaout,phiout);
 278   planeZposition=RadThick();
 279   planePoint.SetXYZ(0,0,planeZposition);
 280   TVector3 entranceToSiO2Point = PlaneIntersect(vectorPhotonInC6F14,emissionPoint,nPlane,planePoint);
 281
 282   Double_t photonEn = EckovMean();
 283   Double_t angleInSiO2 = SnellAngle(IdxC6F14(EckovMean()),IdxSiO2(EckovMean()),vectorPhotonInC6F14.Theta());if(angleInSiO2<0) return vBad;
 284   TVector3 vectorPhotonInSiO2;
 285   vectorPhotonInSiO2.SetMagThetaPhi(1,angleInSiO2,phiout);
 286 //  planeZposition+=AliRICHParam::SiO2Thickness();
 287   planeZposition+=WinThick();
 288   planePoint.SetXYZ(0,0,planeZposition);
 289   TVector3 entranceToCH4 = PlaneIntersect(vectorPhotonInSiO2,entranceToSiO2Point,nPlane,planePoint);
 290 //  entranceToCH4.Dump();
 291
 292   //  Double_t angleInCH4 = SnellAngle(AliRICHParam::IndOfRefSiO2(6.755),AliRICHParam::IndOfRefCH4,angleInSiO2);
 293   Double_t angleInCH4 = SnellAngle(IdxSiO2(photonEn),IdxCH4(photonEn),vectorPhotonInSiO2.Theta());if(angleInCH4<0) return vBad;
 294   TVector3 vectorPhotonInCH4;
 295   vectorPhotonInCH4.SetMagThetaPhi(1,angleInCH4,phiout);
 296 //  planeZposition+=AliRICHParam::GapProx();
 297   planeZposition+=Pc2Win();
 298   planePoint.SetXYZ(0,0,planeZposition);
 299   TVector3 impactToPC = PlaneIntersect(vectorPhotonInCH4,entranceToCH4,nPlane,planePoint);
 300 //  impactToPC.Dump();
 301   return impactToPC;
 302 }//FowardTracing
 303 //__________________________________________________________________________________________________
 304 TVector3 AliRICHParam::PlaneIntersect(const TVector3 &lineDir,const TVector3 &linePoint,const TVector3 &planeNorm,const TVector3 &planePoint)
 305 {
 306 // Finds an intersection point between a line and plane.
 307 // Arguments:  lineDir,linePoint    - vector along the line and any point of the line
 308 //             planeNorm,planePoint - vector normal to the plane and any point of the plane
 309 //   Returns:  point of intersection if any
 310   if(planeNorm*lineDir==0) return   TVector3(-999,-999,-999);
 311   TVector3 diff=planePoint-linePoint;
 312   Double_t sint=(planeNorm*diff)/(planeNorm*lineDir);
 313   return linePoint+sint*lineDir;
 314 }//PlaneIntersect
 315 //__________________________________________________________________________________________________
 316 Double_t AliRICHParam::SnellAngle(Float_t n1, Float_t n2, Float_t theta1)
 317 {
 318 // Compute the angle of refraction out of Snell law
 319 // Arguments: n1 - ref idx of first substance
 320 //            n2 - ref idx of second substance
 321 //            n1 - photon impact angle in the first substance i.e. angle between the photon direction and vector normal to the surface (radians)
 322 //   Returns: photon refraction angle, i.e. angle in the second substance (radians)
 323   Double_t sinref=(n1/n2)*TMath::Sin(theta1);
 324   if(sinref>1.)    return -999;
 325   else             return TMath::ASin(sinref);
 326 }//SnellAngle
 327 //__________________________________________________________________________________________________
 328 void AliRICHParam::AnglesInDRS(Double_t trackTheta,Double_t trackPhi,Double_t thetaCerenkov,Double_t phiCerenkov,Double_t &tout,Double_t &pout)
 329 {
 330 // Setup the rotation matrix of the track...
 331
 332   TRotation mtheta;
 333   TRotation mphi;
 334   TRotation minv;
 335   TRotation mrot;
 336
 337   mtheta.RotateY(trackTheta);
 338   mphi.RotateZ(trackPhi);
 339
 340   mrot = mphi * mtheta;
 341     //  minv = mrot.Inverse();
 342
 343   TVector3 photonInRadiator(1,1,1);
 344
 345   photonInRadiator.SetTheta(thetaCerenkov);
 346   photonInRadiator.SetPhi(phiCerenkov);
 347   photonInRadiator = mrot * photonInRadiator;
 348   tout=photonInRadiator.Theta();
 349   pout=photonInRadiator.Phi();
 350 }//AnglesInDRS
 351 /*
 352 void DrawRing()
 353 {
 354
 355   //  Float_t xGraph[1000],yGraph[1000];
 356
 357   Float_t type;
 358   Float_t MassOfParticle;
 359   Float_t beta;
 360   Float_t nfreon;
 361
 362   Float_t ThetaCerenkov;
 363
 364   Float_t Xtoentr = GetEntranceX();
 365   Float_t Ytoentr = GetEntranceY();
 366
 367   Float_t pmod = GetTrackMomentum();
 368   Float_t TrackTheta = GetTrackTheta();
 369   Float_t TrackPhi = GetTrackPhi();
 370
 371   SetPhotonEnergy(AliRICHParam::MeanCkovEnergy());
 372   SetFreonRefractiveIndex();
 373
 374   SetEmissionPoint(RadiatorWidth/2.);
 375
 376   ThetaCerenkov = GetThetaCerenkov();
 377   FindBetaFromTheta(ThetaCerenkov);
 378   nfreon = GetFreonRefractiveIndex();
 379
 380   Int_t nPoints = 100;
 381
 382   Int_t nPointsToDraw = 0;
 383   for(Int_t i=0;i<nPoints;i++)
 384     {
 385       Float_t phpad = 2*TMath::Pi()*i/nPoints;
 386       SetThetaPhotonInTRS(thetacer);
 387       SetPhiPhotonInTRS(phpad);
 388       FindPhotonAnglesInDRS();
 389       Float_t Radius = FromEmissionToCathode();
 390       if (Radius == 999.) continue;
 391       xGraph[nPointsToDraw] = GetXPointOnCathode() + GetShiftX();
 392       yGraph[nPointsToDraw] = GetYPointOnCathode() + GetShiftY();
 393       nPointsToDraw++;
 394     }
 395   gra = new TGraph(nPointsToDraw,xGraph,yGraph);
 396   gra->Draw("AC");
 397 }
 398 //__________________________________________________________________________________________________
 399 */
 400 void AliRICHParam::TestHit2SDigs(Double_t x,Double_t y,Double_t e,Bool_t isNew)
 401 {
 402 //Test  hit->sdigits procedures
 403 //Arguments: isNew - if true use new (abs pad) procedure else use old one (TVector)
 404 //  Returns: none
 405   TClonesArray *pSDigLst=new TClonesArray("AliRICHDigit");
 406   Int_t iQtot=-1;
 407   if(isNew){
 408     iQtot=Hit2SDigs(10101,e,pSDigLst);        //new technique
 409   }else{
 410     iQtot=Hit2SDigs(TVector2(x,y),e,pSDigLst);//old technique
 411   }
 412   pSDigLst->Print();
 413   Double_t dQsum=0;
 414   for(Int_t i=0;i<pSDigLst->GetEntriesFast();i++)
 415     dQsum+=((AliRICHDigit*)pSDigLst->At(i))->Qdc();
 416   Printf("Qtot=%i Qsum=%.2f ",iQtot,dQsum);
 417 }
 418 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 419 Int_t AliRICHParam::Stack(Int_t evt,Int_t tid)
 420 {
 421 // Prints some usefull info from stack
 422 // Arguments: evt - event number. if not -1 print info only for that event
 423 //            tid - track id. if not -1 then print it and all it's mothers if any
 424 //   Returns: mother tid of the given tid if any
 425   AliRunLoader *pAL=AliRunLoader::Open();
 426   if(pAL->LoadHeader()) return -1;
 427   if(pAL->LoadKinematics()) return -1;
 428
 429   Int_t mtid=-1;
 430   Int_t iNevt=pAL->GetNumberOfEvents();     Printf("This session contains %i event(s)",iNevt);
 431
 432   for(Int_t iEvt=0;iEvt<iNevt;iEvt++){//events loop
 433     if(evt!=-1 && evt!=iEvt) continue; //in case one needs to print the requested event, ignore all others
 434     pAL->GetEvent(iEvt);
 435     AliStack *pStack=pAL->Stack();
 436     if(tid==-1){                        //print all tids for this event
 437       for(Int_t i=0;i<pStack->GetNtrack();i++) pStack->Particle(i)->Print();
 438       Printf("totally %i tracks including %i primaries for event %i out of %i event(s)",pStack->GetNtrack(),pStack->GetNprimary(),iEvt,iNevt);
 439     }else{                              //print only this tid and it;s mothers
 440       if(tid<0 || tid>pStack->GetNtrack()) {Printf("Wrong tid, valid tid range for event %i is 0-%i",iEvt,pStack->GetNtrack());break;}
 441       TParticle *pTrack=pStack->Particle(tid); mtid=pTrack->GetFirstMother();
 442       TString str=pTrack->GetName();
 443       while((tid=pTrack->GetFirstMother()) >= 0){
 444         pTrack=pStack->Particle(tid);
 445         str+=" from ";str+=pTrack->GetName();
 446       }
 447       Printf("%s",str.Data());
 448     }//if(tid==-1)
 449   }//events loop
 450   pAL->UnloadHeader();  pAL->UnloadKinematics();
 451   return mtid;
 452 }
 453 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 454 Int_t AliRICHParam::StackCount(Int_t pid,Int_t evt)
 455 {
 456 // Counts total number of particles of given sort (including secondary) for a given event
 457   AliRunLoader *pAL=AliRunLoader::Open();
 458   pAL->GetEvent(evt);
 459   if(pAL->LoadHeader()) return 0;
 460   if(pAL->LoadKinematics()) return 0;
 461   AliStack *pStack=pAL->Stack();
 462
 463   Int_t iCnt=0;
 464   for(Int_t i=0;i<pStack->GetNtrack();i++) if(pStack->Particle(i)->GetPdgCode()==pid) iCnt++;
 465
 466   pAL->UnloadHeader();  pAL->UnloadKinematics();
 467   return iCnt;
 468 }
 469 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++