No return in void function (Alpha)
[u/mrichter/AliRoot.git] / RICH / AliRICHv1.cxx
index 802fcea..b4f3765 100644 (file)
-/**************************************************************************
- * 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.                  *
- **************************************************************************/
+// **************************************************************************
+// * 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.                  *
+// **************************************************************************
 
-/*
-  $Log$
-  Revision 1.11  2001/02/13 20:10:33  jbarbosa
-  Removed call to SetNSec() (obsolete). Fixed bug in chamber initialisation (not all chambers were initialised).
-
-  Revision 1.10  2000/12/20 14:08:02  jbarbosa
-  Removed dependencies on TGeant3 (thanks to F. Carminati and I. Hrivnacova)
-
-  Revision 1.9  2000/12/18 17:44:40  jbarbosa
-  Took two lines out of output.
-
-  Revision 1.8  2000/11/01 15:39:00  jbarbosa
-  Updated default geometry.
-
-  Revision 1.7  2000/10/03 21:44:09  morsch
-  Use AliSegmentation and AliHit abstract base classes.
-
-  Revision 1.6  2000/07/10 15:28:39  fca
-  Correction of the inheritance scheme
-
-  Revision 1.5  2000/06/30 16:38:51  dibari
-  Removed setters.
-
-  Revision 1.4  2000/06/13 13:13:40  jbarbosa
-  Correcting previous correction...
-
-  Revision 1.3  2000/06/13 13:06:38  jbarbosa
-  Fixed compiling error for HP (multiple declaration)
-
-  Revision 1.2  2000/06/12 15:36:16  jbarbosa
-  Cleaned up version.
-
-  Revision 1.1  2000/06/09 15:00:31  jbarbosa
-  New full version. All parameters configurable.
-
-  Revision 1.9  2000/05/31 08:19:38  jbarbosa
-  Fixed bug in StepManager
-
-  Revision 1.8  2000/05/26 17:30:08  jbarbosa
-  Cerenkov angle now stored within cerenkov data structure.
-
-  Revision 1.7  2000/05/18 10:31:36  jbarbosa
-  Fixed positioning of spacers inside freon.
-  Fixed positioning of proximity gap
-  inside methane.
-  Fixed cut on neutral particles in the StepManager.
-
-  Revision 1.6  2000/04/28 11:51:58  morsch
-   Dimensions of arrays hits and Ckov_data corrected.
-
-  Revision 1.5  2000/04/19 13:28:46  morsch
-  Major changes in geometry (parametrised), materials (updated) and
-  step manager (diagnostics) (JB, AM)
-
-*/
-
-
-
-//////////////////////////////////////////////////////////
-//  Manager and hits classes for set: RICH full version //
-//////////////////////////////////////////////////////////
-
-#include <TTUBE.h>
-#include <TNode.h> 
-#include <TRandom.h> 
-#include <TParticle.h> 
 
 #include "AliRICHv1.h"
-#include "AliRICHHit.h"
-#include "AliSegmentation.h"
-#include "AliRICHResponse.h"
-#include "AliRICHSegmentationV0.h"
-#include "AliRICHResponseV0.h"
-#include "AliRICHGeometry.h"
-#include "AliRun.h"
-#include "AliMC.h"
-#include "iostream.h"
-#include "AliCallf77.h"
-#include "AliConst.h" 
-#include "AliPDG.h" 
-
-ClassImp(AliRICHv1)
-    
-//___________________________________________
-AliRICHv1::AliRICHv1()
-{
-
-// Default constructor fo AliRICHvv1 (full version)
+#include "AliRICHParam.h"
+#include "AliRICHChamber.h"
+#include <TParticle.h> 
+#include <TRandom.h> 
+#include <TVirtualMC.h>
+#include <TPDGCode.h>
 
-    //fChambers = 0;
-}
+#include <AliConst.h>
+#include <AliPDG.h>
+#include <AliRun.h>
+#include <AliMC.h>
 
-//___________________________________________
-AliRICHv1::AliRICHv1(const char *name, const char *title)
-    : AliRICH(name,title)
+ClassImp(AliRICHv1)    
+//__________________________________________________________________________________________________
+void AliRICHv1::StepManager()
 {
-
-// Full version of RICH with hits and diagnostics
-
-  // Version 0
-// Default Segmentation, no hits
-    AliRICHSegmentationV0* segmentation = new AliRICHSegmentationV0;
-//
-//  Segmentation parameters
-    segmentation->SetPadSize(0.84,0.80);
-    segmentation->SetDAnod(0.84/2);
-//
-//  Geometry parameters
-    AliRICHGeometry* geometry = new AliRICHGeometry;
-    geometry->SetGapThickness(8);
-    geometry->SetProximityGapThickness(.4);
-    geometry->SetQuartzLength(133);
-    geometry->SetQuartzWidth(127.9);
-    geometry->SetQuartzThickness(.5);
-    geometry->SetOuterFreonLength(133);
-    geometry->SetOuterFreonWidth(41.3);
-    geometry->SetInnerFreonLength(133);
-    geometry->SetInnerFreonWidth(41.3);
-    geometry->SetFreonThickness(1.5);
-//
-//  Response parameters
-    AliRICHResponseV0*  response   = new AliRICHResponseV0;
-    response->SetSigmaIntegration(5.);
-    response->SetChargeSlope(27.);
-    response->SetChargeSpread(0.18, 0.18);
-    response->SetMaxAdc(4096);
-    response->SetAlphaFeedback(0.036);
-    response->SetEIonisation(26.e-9);
-    response->SetSqrtKx3(0.77459667);
-    response->SetKx2(0.962);
-    response->SetKx4(0.379);
-    response->SetSqrtKy3(0.77459667);
-    response->SetKy2(0.962);
-    response->SetKy4(0.379);
-    response->SetPitch(0.25);
-    response->SetWireSag(0);                     // 1->On, 0->Off
-    response->SetVoltage(2150);                  // Should only be 2000, 2050, 2100 or 2150
-
-//
-//    AliRICH *RICH = (AliRICH *) gAlice->GetDetector("RICH"); 
-    
-    fCkovNumber=0;
-    fFreonProd=0;
-    Int_t i=0;
-    
-    fChambers = new TObjArray(kNCH);
-    for (i=0; i<kNCH; i++) {
-      
-      (*fChambers)[i] = new AliRICHChamber();  
-      
-    }
+// Full Step Manager.
+// 3- Ckovs absorbed on Collection electrods
+// 5- Ckovs absorbed on Cathode wires
+// 6- Ckovs absorbed on Anod wires
+         
+  Int_t          copy;
+  static Int_t   iCurrentChamber;
+  static Int_t idRRAD = gMC->VolId("RRAD");
+  static Int_t idRRWI = gMC->VolId("RRWI");
+  static Int_t idRICH = gMC->VolId("RICH");
+  static Int_t idRPC  = gMC->VolId("RPC ");
+  static Int_t idRGAP = gMC->VolId("RGAP");
+//history of Cerenkovs
+  if(gMC->TrackPid()==kCerenkov){
+    if( gMC->IsNewTrack()   && gMC->CurrentVolID(copy)==idRRAD) fCounters(0)++;// 0- Ckovs produced in radiator
+    if(!gMC->IsTrackAlive() && gMC->CurrentVolID(copy)==idRRAD) fCounters(1)++;// 1- Ckovs absorbed in radiator
+    if(!gMC->IsTrackAlive() && gMC->CurrentVolID(copy)==idRRWI) fCounters(2)++;// 2- Ckovs absorbed in radiator window
+    if(!gMC->IsTrackAlive() && gMC->CurrentVolID(copy)==idRICH) fCounters(4)++;// 4- Ckovs absorbed in CH4
+  }
+          
+//Treat photons    
+  static TLorentzVector cerX4;
+  if((gMC->TrackPid()==kCerenkov||gMC->TrackPid()==kFeedback)&&gMC->CurrentVolID(copy)==idRPC){//photon in PC
+    if(gMC->Edep()>0){//photon in PC +DE
+      if(IsLostByFresnel()){ 
+        if(gMC->TrackPid()==kCerenkov) fCounters(7)++;// 7- Ckovs reflected from CsI
+        gMC->StopTrack();
+        return;
+      }        
+      gMC->TrackPosition(cerX4); gMC->CurrentVolOffID(2,iCurrentChamber);//RICH-RPPF-RPC
+       
+      AddHit(iCurrentChamber,gAlice->GetMCApp()->GetCurrentTrackNumber(),cerX4.Vect(),cerX4.Vect());//HIT for PHOTON in conditions CF+CSI+DE
+      fCounters(8)++;//4- Ckovs converted to electron on CsI
+      GenerateFeedbacks(iCurrentChamber);
+    }//photon in PC and DE >0 
+  }//photon in PC
   
-    for (i=0; i<kNCH; i++) {
-      SetGeometryModel(i,geometry);
-      SetSegmentationModel(i, segmentation);
-      SetResponseModel(i, response);
-      SetDebugLevel(0);
-    }
-
-
-}
-
-void AliRICHv1::Init()
+//Treat charged particles  
+  static Float_t eloss;
+  static TLorentzVector mipInX4,mipOutX4;
+  if(gMC->TrackCharge() && gMC->CurrentVolID(copy)==idRGAP){//MIP in GAP
+    gMC->CurrentVolOffID(1,iCurrentChamber);//RICH-RGAP
+    if(gMC->IsTrackEntering()||gMC->IsNewTrack()) {//MIP in GAP entering or newly created
+      eloss=0;                                                           
+      gMC->TrackPosition(mipInX4);
+    }else if(gMC->IsTrackExiting()||gMC->IsTrackStop()||gMC->IsTrackDisappeared()){//MIP in GAP exiting or disappeared
+      eloss+=gMC->Edep();//take into account last step dEdX
+      gMC->TrackPosition(mipOutX4);  
+      AddHit(iCurrentChamber,gAlice->GetMCApp()->GetCurrentTrackNumber(),mipInX4.Vect(),mipOutX4.Vect(),eloss);//HIT for MIP: MIP in GAP Exiting
+      GenerateFeedbacks(iCurrentChamber,eloss);//MIP+GAP+Exit
+    }else//MIP in GAP going inside
+      eloss   += gMC->Edep();
+  }//MIP in GAP
+}//StepManager()
+//__________________________________________________________________________________________________
+Bool_t AliRICHv1::IsLostByFresnel()
 {
-
-  printf("*********************************** RICH_INIT ***********************************\n");
-  printf("*                                                                               *\n");
-  printf("*                        AliRICHv1 Full version started                         *\n");
-  printf("*                                                                               *\n");
-
+// Calculate probability for the photon to be lost by Fresnel reflection.
+  TLorentzVector p4;
+  Double_t mom[3],localMom[3];
+  gMC->TrackMomentum(p4);   mom[0]=p4(1);   mom[1]=p4(2);   mom[2]=p4(3);
+  localMom[0]=0; localMom[1]=0; localMom[2]=0;
+  gMC->Gmtod(mom,localMom,2);
+  Double_t localTc    = localMom[0]*localMom[0]+localMom[2]*localMom[2];
+  Double_t localTheta = TMath::ATan2(TMath::Sqrt(localTc),localMom[1]);
+  Double_t cotheta = TMath::Abs(TMath::Cos(localTheta));
+  if(gMC->GetRandom()->Rndm() < Fresnel(p4.E()*1e9,cotheta,1)){
+    AliDebug(1,"Photon lost");
+    return kTRUE;
+  }else
+    return kFALSE;
+}//IsLostByFresnel()
+//__________________________________________________________________________________________________
+void AliRICHv1::GenerateFeedbacks(Int_t iChamber,Float_t eloss)
+{
+// Generate FeedBack photons for the current particle. To be invoked from StepManager().
+// eloss=0 means photon so only pulse height distribution is to be analysed. This one is done in AliRICHParam::TotQdc()
   
-  AliSegmentation*  segmentation;
-  AliRICHGeometry*  geometry;
-  AliRICHResponse*  response;
-
-
-    // 
-    // Initialize Tracking Chambers
-    //
-    for (Int_t i=0; i<kNCH; i++) {
-       //printf ("i:%d",i);
-       ( (AliRICHChamber*) (*fChambers)[i])->Init(i);  
-    }  
+  TLorentzVector x4;
+  gMC->TrackPosition(x4);  
+  TVector2 x2=C(iChamber)->Mrs2Pc(x4);//hit position on photocathode plane
+  TVector2 xspe=x2;
+  Int_t sector=P()->Loc2Sec(xspe);  if(sector==kBad) return; //hit in dead zone, nothing to produce
+  Int_t iTotQdc=P()->TotQdc(x2,eloss);
+  Int_t iNphotons=gMC->GetRandom()->Poisson(P()->C(iChamber)->AlphaFeedback(sector)*iTotQdc);    
+  AliDebug(1,Form("N photons=%i",iNphotons));
+  Int_t j;
+  Float_t cthf, phif, enfp = 0, sthf, e1[3], e2[3], e3[3], vmod, uswop,dir[3], phi,pol[3], mom[4];
+//Generate photons
+  for(Int_t i=0;i<iNphotons;i++){//feedbacks loop
+    Double_t ranf[2];
+    gMC->GetRandom()->RndmArray(2,ranf);    //Sample direction
+    cthf=ranf[0]*2-1.0;
+    if(cthf<0) continue;
+    sthf = TMath::Sqrt((1 - cthf) * (1 + cthf));
+    phif = ranf[1] * 2 * TMath::Pi();
     
-    //
-    // Set the chamber (sensitive region) GEANT identifier
+    if(Double_t randomNumber=gMC->GetRandom()->Rndm()<=0.57)
+      enfp = 7.5e-9;
+    else if(randomNumber<=0.7)
+      enfp = 6.4e-9;
+    else
+      enfp = 7.9e-9;
     
-    ((AliRICHChamber*)(*fChambers)[0])->SetGid(1);  
-    ((AliRICHChamber*)(*fChambers)[1])->SetGid(2);  
-    ((AliRICHChamber*)(*fChambers)[2])->SetGid(3);  
-    ((AliRICHChamber*)(*fChambers)[3])->SetGid(4);  
-    ((AliRICHChamber*)(*fChambers)[4])->SetGid(5);  
-    ((AliRICHChamber*)(*fChambers)[5])->SetGid(6);  
-    ((AliRICHChamber*)(*fChambers)[6])->SetGid(7); 
-
-    Float_t pos1[3]={0,471.8999,165.2599};
-    Chamber(0).SetChamberTransform(pos1[0],pos1[1],pos1[2],new TRotMatrix("rot993","rot993",90,0,70.69,90,19.30999,-90));
-
-    Float_t pos2[3]={171,470,0};
-    Chamber(1).SetChamberTransform(pos2[0],pos2[1],pos2[2],new TRotMatrix("rot994","rot994",90,-20,90,70,0,0));
 
-    Float_t pos3[3]={0,500,0};
-    Chamber(2).SetChamberTransform(pos3[0],pos3[1],pos3[2],new TRotMatrix("rot995","rot995",90,0,90,90,0,0));
+    dir[0] = sthf * TMath::Sin(phif);    dir[1] = cthf;    dir[2] = sthf * TMath::Cos(phif);
+    gMC->Gdtom(dir, mom, 2);
+    mom[0]*=enfp;    mom[1]*=enfp;    mom[2]*=enfp;
+    mom[3] = TMath::Sqrt(mom[0]*mom[0]+mom[1]*mom[1]+mom[2]*mom[2]);
     
-    Float_t pos4[3]={-171,470,0};
-    Chamber(3).SetChamberTransform(pos4[0],pos4[1],pos4[2], new TRotMatrix("rot996","rot996",90,20,90,110,0,0));  
-
-    Float_t pos5[3]={161.3999,443.3999,-165.3};
-    Chamber(4).SetChamberTransform(pos5[0],pos5[1],pos5[2],new TRotMatrix("rot997","rot997",90,340,108.1999,70,18.2,70));
-
-    Float_t pos6[3]={0., 471.9, -165.3,};
-    Chamber(5).SetChamberTransform(pos6[0],pos6[1],pos6[2],new TRotMatrix("rot998","rot998",90,0,109.3099,90,19.30999,90));
-
-    Float_t pos7[3]={-161.399,443.3999,-165.3};
-    Chamber(6).SetChamberTransform(pos7[0],pos7[1],pos7[2],new TRotMatrix("rot999","rot999",90,20,108.1999,110,18.2,110));
+    // Polarisation
+    e1[0]=      0;    e1[1]=-dir[2];    e1[2]= dir[1];
+    e2[0]=-dir[1];    e2[1]= dir[0];    e2[2]=      0;
+    e3[0]= dir[1];    e3[1]=      0;    e3[2]=-dir[0];
     
-    segmentation=Chamber(0).GetSegmentationModel(0);
-    geometry=Chamber(0).GetGeometryModel();
-    response=Chamber(0).GetResponseModel();
+    vmod=0;
+    for(j=0;j<3;j++) vmod+=e1[j]*e1[j];
+    if (!vmod) for(j=0;j<3;j++) {
+      uswop=e1[j];
+      e1[j]=e3[j];
+      e3[j]=uswop;
+    }
+    vmod=0;
+    for(j=0;j<3;j++) vmod+=e2[j]*e2[j];
+    if (!vmod) for(j=0;j<3;j++) {
+      uswop=e2[j];
+      e2[j]=e3[j];
+      e3[j]=uswop;
+    }
     
-     
-    printf("*                            Pads            : %3dx%3d                          *\n",segmentation->Npx(),segmentation->Npy());
-    printf("*                            Pad size        : %5.2f x%5.2f mm2                 *\n",segmentation->Dpx(),segmentation->Dpy()); 
-    printf("*                            Gap Thickness   : %5.1f cm                         *\n",geometry->GetGapThickness());
-    printf("*                            Radiator Width  : %5.1f cm                         *\n",geometry->GetQuartzWidth());
-    printf("*                            Radiator Length : %5.1f cm                         *\n",geometry->GetQuartzLength());
-    printf("*                            Freon Thickness : %5.1f cm                         *\n",geometry->GetFreonThickness());
-    printf("*                            Charge Slope    : %5.1f ADC                        *\n",response->ChargeSlope());
-    printf("*                            Feedback Prob.  : %5.2f %%                          *\n",response->AlphaFeedback()*100);
-    printf("*                            Debug Level     : %3d                              *\n",GetDebugLevel());
-    printf("*                                                                               *\n");
-    printf("*********************************************************************************\n");
-
-}
-
-
-
-
-
-
-
-
+    vmod=0;  for(j=0;j<3;j++) vmod+=e1[j]*e1[j];  vmod=TMath::Sqrt(1/vmod);  for(j=0;j<3;j++) e1[j]*=vmod;    
+    vmod=0;  for(j=0;j<3;j++) vmod+=e2[j]*e2[j];  vmod=TMath::Sqrt(1/vmod);  for(j=0;j<3;j++) e2[j]*=vmod;
+    
+    phi = gMC->GetRandom()->Rndm()* 2 * TMath::Pi();
+    for(j=0;j<3;j++) pol[j]=e1[j]*TMath::Sin(phi)+e2[j]*TMath::Cos(phi);
+    gMC->Gdtom(pol, pol, 2);
+    Int_t outputNtracksStored;    
+    gAlice->GetMCApp()->PushTrack(1,                 //do not transport
+                     gAlice->GetMCApp()->GetCurrentTrackNumber(),//parent track 
+                     kFeedback,                      //PID
+                    mom[0],mom[1],mom[2],mom[3],    //track momentum  
+                     x4.X(),x4.Y(),x4.Z(),x4.T(),    //track origin 
+                     pol[0],pol[1],pol[2],           //polarization
+                    kPFeedBackPhoton,
+                     outputNtracksStored,
+                     1.0);    
+  }//feedbacks loop
+  AliDebug(1,"Stop.");
+}//GenerateFeedbacks()