HMPID/AliHMPIDv2.cxx

   1
   2 // **************************************************************************
   3 // * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
   4 // *                                                                        *
   5 // * Author: The ALICE Off-line Project.                                    *
   6 // * Contributors are mentioned in the code where appropriate.              *
   7 // *                                                                        *
   8 // * Permission to use, copy, modify and distribute this software and its   *
   9 // * documentation strictly for non-commercial purposes is hereby granted   *
  10 // * without fee, provided that the above copyright notice appears in all   *
  11 // * copies and that both the copyright notice and this permission notice   *
  12 // * appear in the supporting documentation. The authors make no claims     *
  13 // * about the suitability of this software for any purpose. It is          *
  14 // * provided "as is" without express or implied warranty.                  *
  15 // **************************************************************************
  16
  17
  18 #include "AliHMPIDv2.h"       //class header
  19 #include "AliHMPIDParam.h"    //StepManager()
  20 #include "AliHMPIDHit.h"      //Hits2SDigs(),StepManager()
  21 #include "AliHMPIDDigit.h"    //Digits2Raw(), Raw2SDigits()
  22 #include "AliRawReader.h"     //Raw2SDigits()
  23 #include <TVirtualMC.h>       //StepManager() for gMC
  24 #include <TPDGCode.h>         //StepHistory()
  25 #include <AliStack.h>         //StepManager(),Hits2SDigits()78.6
  26 #include <AliLoader.h>        //Hits2SDigits()
  27 #include <AliRunLoader.h>     //Hits2SDigits()
  28 #include <AliMC.h>            //StepManager()
  29 #include <AliRun.h>           //CreateMaterials()
  30 #include <AliMagF.h>          //CreateMaterials()
  31 #include <TGeoManager.h>      //CreateGeometry()
  32 #include <TF1.h>              //DefineOpticalProperties()
  33 #include <TF2.h>              //DefineOpticalProperties()
  34 #include <TLorentzVector.h>   //IsLostByFresnel()
  35 #include <AliCDBManager.h>    //CreateMaterials()
  36 #include <AliCDBEntry.h>      //CreateMaterials()
  37 #include <TGeoPhysicalNode.h> //AddAlignableVolumes()
  38
  39 ClassImp(AliHMPIDv2)
  40 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  41 void AliHMPIDv2::AddAlignableVolumes()const
  42 {
  43 // Associates the symbolic volume name with the corresponding volume path. Interface method from AliModule invoked from AliMC
  44 // Arguments: none
  45 //   Returns: none
  46
  47   TGeoHMatrix *pGm = new TGeoHMatrix;
  48   Double_t trans[3]={0.5*131.24,0.5*126.16,0};                            //translation from LORS to TGeo RS (half size AllX, half size allY,0)
  49   pGm->SetTranslation(trans);
  50
  51   for(Int_t i=AliHMPIDParam::kMinCh;i<=AliHMPIDParam::kMaxCh;i++) {
  52       TGeoPNEntry *pPn=gGeoManager->SetAlignableEntry(Form("/HMPID/Chamber%i",i),Form("ALIC_1/Hmp_%i",i));
  53       if(pPn) pPn->SetMatrix(pGm);
  54     }
  55 }
  56 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  57 void AliHMPIDv2::CreateMaterials()
  58 {
  59 // Definition of available HMPID materials
  60 // Arguments: none
  61 //   Returns: none
  62   AliDebug(1,"Start v2 HMPID.");
  63
  64     //clm update material definition later on from Antonello
  65
  66 //data from PDG booklet 2002     density [gr/cm^3] rad len [cm] abs len [cm]
  67   Float_t   aAir[4]={12,14,16,36}    ,   zAir[4]={6,7,8,18} ,   wAir[4]={0.000124,0.755267,0.231781,0.012827} , dAir=0.00120479; Int_t nAir=4;//mixture 0.9999999
  68   Float_t aC6F14[2]={ 12.01 , 18.99} , zC6F14[2]={ 6 , 9}   , wC6F14[2]={6 , 14} , dC6F14=1.68    ; Int_t nC6F14=-2;
  69   Float_t  aSiO2[2]={ 28.09 , 15.99} ,  zSiO2[2]={14 , 8}   ,  wSiO2[2]={1 ,  2} ,  dSiO2=2.64    ; Int_t  nSiO2=-2;
  70   Float_t   aCH4[2]={ 12.01 ,  1.01} ,   zCH4[2]={ 6 , 1}   ,   wCH4[2]={1 ,  4} ,   dCH4=7.17e-4 ; Int_t   nCH4=-2;
  71   Float_t   aCsI[2]={132.90 ,126.90} ,   zCsI[2]={55 ,53}   ,   wCsI[2]={1 ,  1} ,   dCsI=0.1     ; Int_t   nCsI=-2;
  72
  73   Float_t     aRoha= 12.01 ,               zRoha=  6 ,                              dRoha=  0.10 ,   radRoha= 18.80 , absRoha=  86.3/dRoha; //special material- quasi quartz
  74   Float_t       aCu= 63.55 ,                 zCu= 29 ,                                dCu=  8.96 ,     radCu=  1.43 ,   absCu= 134.9/dCu  ;
  75   Float_t        aW=183.84 ,                  zW= 74 ,                                 dW= 19.30 ,      radW=  0.35 ,    absW= 185.0/dW   ;
  76   Float_t       aAl= 26.98 ,                 zAl= 13 ,                                dAl=  2.70 ,     radAl=  8.90 ,   absAl= 106.4/dAl  ;
  77   Float_t       aAr= 39.94 ,                 zAr= 18 ,                                dAr=  1.396e-3,  radAr=  14.0 ,   absAr= 117.2/dAr  ;
  78
  79     Int_t   matId=0;                           //tmp material id number
  80     Int_t   unsens =  0, sens=1;               //sensitive or unsensitive medium
  81     Int_t   itgfld = gAlice->Field()->Integ(); //type of field intergration 0 no field -1 user in guswim 1 Runge Kutta 2 helix 3 const field along z
  82     Float_t maxfld = gAlice->Field()->Max();   //max field value
  83     Float_t tmaxfd = -10.0;                    //max deflection angle due to magnetic field in one step
  84     Float_t deemax = - 0.2;                    //max fractional energy loss in one step
  85     Float_t stemax = - 0.1;                    //mas step allowed [cm]
  86     Float_t epsil  =   0.001;                  //abs tracking precision [cm]
  87     Float_t stmin  = - 0.001;                  //min step size [cm] in continius process transport, negative value: choose it automatically
  88
  89     AliMixture(++matId,"Air"  ,aAir  ,zAir  ,dAir  ,nAir  ,wAir  ); AliMedium(kAir  ,"Air"  ,matId, unsens, itgfld, maxfld, tmaxfd, stemax, deemax, epsil, stmin);
  90     AliMixture(++matId,"C6F14",aC6F14,zC6F14,dC6F14,nC6F14,wC6F14); AliMedium(kC6F14,"C6F14",matId, unsens, itgfld, maxfld, tmaxfd, stemax, deemax, epsil, stmin);
  91     AliMixture(++matId,"SiO2" ,aSiO2 ,zSiO2 ,dSiO2 ,nSiO2 ,wSiO2 ); AliMedium(kSiO2 ,"SiO2" ,matId, unsens, itgfld, maxfld, tmaxfd, stemax, deemax, epsil, stmin);
  92     AliMixture(++matId,"CH4"  ,aCH4  ,zCH4  ,dCH4  ,nCH4  ,wCH4  ); AliMedium(kCH4  ,"CH4"  ,matId, unsens, itgfld, maxfld, tmaxfd, stemax, deemax, epsil, stmin);
  93     AliMixture(++matId,"CsI"  ,aCsI  ,zCsI  ,dCsI  ,nCsI  ,wCsI  ); AliMedium(kCsI  ,"CsI"  ,matId,   sens, itgfld, maxfld, tmaxfd, stemax, deemax, epsil, stmin);//sensitive
  94
  95     AliMixture(++matId ,"Neo" ,aSiO2 ,zSiO2 ,dSiO2 ,nSiO2 ,wSiO2 ); AliMedium(kNeo,"Neo" , matId, unsens, itgfld, maxfld, tmaxfd, stemax, deemax, epsil, stmin); //clm neoceram
  96     AliMaterial(++matId,"Roha",aRoha,zRoha,dRoha,radRoha,absRoha);  AliMedium(kRoha,"Roha", matId, unsens, itgfld, maxfld, tmaxfd, stemax, deemax, epsil, stmin); //Roha->honeycomb
  97
  98
  99     AliMaterial(++matId,"Cu"  ,aCu  ,zCu  ,dCu  ,radCu  ,absCu  );  AliMedium(kCu  ,"Cu"  , matId, unsens, itgfld, maxfld, tmaxfd, stemax, deemax, epsil, stmin);
 100     AliMaterial(++matId,"W"   ,aW   ,zW   ,dW   ,radW   ,absW   );  AliMedium(kW   ,"W"   , matId, unsens, itgfld, maxfld, tmaxfd, stemax, deemax, epsil, stmin);
 101     AliMaterial(++matId,"Al"  ,aAl  ,zAl  ,dAl  ,radAl  ,absAl  );  AliMedium(kAl  ,"Al"  , matId, unsens, itgfld, maxfld, tmaxfd, stemax, deemax, epsil, stmin);
 102     AliMaterial(++matId,"Ar"  ,aAr  ,zAr  ,dAr  ,radAr  ,absAr  );  AliMedium(kAr  ,"Ar"  , matId, unsens, itgfld, maxfld, tmaxfd, stemax, deemax, epsil, stmin);
 103 }//void AliHMPID::CreateMaterials()
 104 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 105 void AliHMPIDv2::CreateGeometry()
 106 {
 107 //Creates detailed geometry simulation (currently GEANT volumes tree)
 108   AliDebug(1,"Start main.");
 109   if(!gMC->IsRootGeometrySupported()) return;
 110
 111  Double_t cm=1,mm=0.1*cm,um=0.001*mm;//default is cm
 112
 113   TGeoMedium *al   =gGeoManager->GetMedium("HMPID_Al");
 114   TGeoMedium *ch4  =gGeoManager->GetMedium("HMPID_CH4");
 115   TGeoMedium *roha =gGeoManager->GetMedium("HMPID_Roha");
 116   TGeoMedium *neoc =gGeoManager->GetMedium("HMPID_Neo");
 117   TGeoMedium *c6f14=gGeoManager->GetMedium("HMPID_C6F14");
 118   TGeoMedium *sio2 =gGeoManager->GetMedium("HMPID_SiO2");
 119   TGeoMedium *cu   =gGeoManager->GetMedium("HMPID_Cu");
 120   TGeoMedium *w    =gGeoManager->GetMedium("HMPID_W");
 121   TGeoMedium *csi  =gGeoManager->GetMedium("HMPID_CsI");
 122   TGeoMedium *ar   =gGeoManager->GetMedium("HMPID_Ar");
 123
 124   TGeoVolume *hmp=gGeoManager->MakeBox ("Hmp",ch4,1681*mm/2, 1466*mm/2,(2*80*mm+2*60*mm)/2);//2033P1  z from p84 TDR
 125
 126   TString title=GetTitle();
 127   if(title.Contains("TestBeam")){
 128     gGeoManager->GetVolume("ALIC")->AddNode(hmp,0);
 129   }else{
 130     for(Int_t iCh=AliHMPIDParam::kMinCh;iCh<=AliHMPIDParam::kMaxCh;iCh++){//place 7 chambers
 131       TGeoHMatrix *pMatrix=new TGeoHMatrix;
 132       IdealPosition(iCh,pMatrix);
 133       gGeoManager->GetVolume("ALIC")->AddNode(hmp,iCh,pMatrix);
 134     }
 135   }
 136
 137   TGeoRotation *rot=new TGeoRotation("HwireRot"); rot->RotateY(90); //rotate wires around Y to be along X (initially along Z)
 138   TGeoVolume *sbo=gGeoManager->MakeBox ("Hsbo",ch4  , 1419*mm/2 , 1378.00*mm/2 ,   50.5*mm/2);//2072P1
 139   TGeoVolume *cov=gGeoManager->MakeBox ("Hcov",al   , 1419*mm/2 , 1378.00*mm/2 ,    0.5*mm/2);
 140   TGeoVolume *hon=gGeoManager->MakeBox ("Hhon",roha , 1359*mm/2 , 1318.00*mm/2 ,   49.5*mm/2);
 141   TGeoVolume *rad=gGeoManager->MakeBox ("Hrad",c6f14, 1330*mm/2 ,  413.00*mm/2 ,   24.0*mm/2); //2011P1
 142   TGeoVolume *neo=gGeoManager->MakeBox ("Hneo",neoc , 1330*mm/2 ,  413.00*mm/2 ,    4.0*mm/2);
 143   TGeoVolume *win=gGeoManager->MakeBox ("Hwin",sio2 , 1330*mm/2 ,  413.00*mm/2 ,    5.0*mm/2);
 144   TGeoVolume *si1=gGeoManager->MakeBox ("Hsi1",sio2 , 1330*mm/2 ,    5.00*mm/2 ,   15.0*mm/2);
 145   TGeoVolume *si2=gGeoManager->MakeBox ("Hsi2",neoc ,   10*mm/2 ,  403.00*mm/2 ,   15.0*mm/2);
 146   TGeoVolume *spa=gGeoManager->MakeTube("Hspa",sio2 ,    0*mm   ,    5.00*mm   ,   15.0*mm/2);
 147   TGeoVolume *fr4=gGeoManager->MakeBox ("Hfr4",ch4  , 1407*mm/2 , 1366.00*mm/2 ,   15.0*mm/2);//2043P1
 148   TGeoVolume *f4a=gGeoManager->MakeBox ("Hf4a",al   , 1407*mm/2 , 1366.00*mm/2 ,   10.0*mm/2);
 149   TGeoVolume *f4i=gGeoManager->MakeBox ("Hf4i",ch4  , 1323*mm/2 , 1296.00*mm/2 ,   10.0*mm/2);
 150   TGeoVolume *col=gGeoManager->MakeTube("Hcol",cu   ,    0*mm   ,  100.00*um   , 1323.0*mm/2);
 151   TGeoVolume *sec=gGeoManager->MakeBox ("Hsec",ch4  ,  648*mm/2 ,  411.00*mm/2 ,   6.2*mm/2);//sec=gap
 152
 153   Double_t cellx=8.04*mm,celly=8.4*mm;  Int_t nPadX=80, nPadY=48;
 154   TGeoVolume *gap=gGeoManager->MakeBox ("Hgap",ch4  ,  cellx*nPadX/2 ,  celly*nPadY/2 ,    6.2*mm/2); //x=8.04*80 y=8.4*48 z=pad+pad-ano+marign 2006p1
 155   TGeoVolume *row=        gap->Divide  ("Hrow",2,nPadY,0,0);//along Y->48 rows
 156   TGeoVolume *cel=        row->Divide  ("Hcel",1,nPadX,0,0);//along X->80 cells
 157   TGeoVolume *cat=gGeoManager->MakeTube("Hcat",cu   ,    0.00*mm   ,   50.00*um   ,    cellx/2);
 158   TGeoVolume *ano=gGeoManager->MakeTube("Hano",w    ,    0.00*mm   ,   20.00*um   ,    cellx/2);
 159   TGeoVolume *pad=gGeoManager->MakeBox ("Hpad",csi  ,    7.54*mm/2 ,    7.90*mm/2 ,    1.7*mm/2); //2006P1
 160   TGeoVolume *fr1=gGeoManager->MakeBox ("Hfr1",al   , 1463*mm/2 , 1422.00*mm/2 ,   58.3*mm/2);//2040P1
 161   TGeoVolume *fr1up=gGeoManager->MakeBox ("Hfr1up",ch4,(1426.00-37.00)*mm/2 , (1385.00-37.00)*mm/2 ,    20.0*mm/2);//2040P1
 162   TGeoVolume *fr1perUpBig=gGeoManager->MakeBox ("Hfr1perUpBig",ch4,1389*mm/2,35*mm/2,10*mm/2);
 163   TGeoVolume *fr1perUpSma=gGeoManager->MakeBox ("Hfr1perUpSma",ch4,35*mm/2,(1385-37-2*35)*mm/2,10*mm/2);
 164         TGeoVolume *fr1perDowBig=gGeoManager->MakeBox ("Hfr1perDowBig",ch4,1389*mm/2,46*mm/2,2.3*mm/2);
 165   TGeoVolume *fr1perDowSma=gGeoManager->MakeBox ("Hfr1perDowSma",ch4,46*mm/2,(1385-37-2*46)*mm/2,2.3*mm/2);
 166
 167         TGeoVolume *ppf=gGeoManager->MakeBox ("Hppf",al   ,  648*mm/2 ,  411.00*mm/2 ,   38.3*mm/2);//2001P2
 168   TGeoVolume *lar=gGeoManager->MakeBox ("Hlar",ar   ,  181*mm/2 ,   89.25*mm/2 ,   38.3*mm/2);//2001P2
 169   TGeoVolume *smo=gGeoManager->MakeBox ("Hsmo",ar   ,  114*mm/2 ,   89.25*mm/2 ,   38.3*mm/2);//2001P2
 170
 171
 172
 173         TGeoVolume *fr3=   gGeoManager->MakeBox("Hfr3",          al,  1463*mm/2,  1422*mm/2,  34*mm/2);//2041P1
 174    TGeoVolume *fr3up=    gGeoManager->MakeBox("Hfr3up",     ch4, 1323*mm/2,  1282*mm/2,  20*mm/2);//2041P1
 175    TGeoVolume *fr3down=gGeoManager->MakeBox("Hfr3down", ch4, 1437*mm/2,  1370*mm/2,  14*mm/2);//2041P1
 176
 177
 178
 179 // ^ Y   z=         z=-12mm      z=98.25mm               ALIC->7xHmp (virtual)-->1xHsbo (virtual) --->2xHcov (real) 2072P1
 180 // |  ____________________________________                                    |                   |-->1xHhon (real) 2072P1
 181 // | |   ______     ____          ______  |                                   |
 182 //   |  |      |   |    |   *    |      | |                                   |->3xHrad (virtual) --->1xHneo (real) 2011P1
 183 //   |  |50.5mm|   |24mm|   *    |45.5mm| |                                   |                   |-->1xHwin (real) 2011P1
 184 //   |  |      |   |    |   *    |      | |                                   |                   |-->2xHsi1 (real) 2011P1
 185 //   |  |      |   |____|   *    |______| |                                   |                   |-->2xHsi2 (real) 2011P1
 186 //   |  |      |    ____    *     ______  |                                   |                   |->30xHspa (real) 2011P1
 187 //   |  |      |   |    |   *    |      | |                                   |
 188 //   |  |      |   |    |   *    |      | |                                   |->1xHfr4 (vitual) --->1xHf4a (real)---->1xHf4i(virtual) 2043P1
 189 //   |  |  sb  |   | rad|   *    |      | |                                   |                  |-->322xHcol (real) 2043P1
 190 //   |  |      |   |____|   *    |______| |                                   |
 191 //   |  |      |    ____    *     ______  |                                   |->1xHfr1 (real) --> 6xHppf(real) ---->8xHlar (virtual) 2001P1
 192 //   |  |      |   |    |   *    |      | |                                   |                                     |--->8xHsmo (virtual) 2001P1
 193 //   |  |      |   |    |   *    |      | |                                   |
 194 //   |  |      |   |    |   *    |      | |                                   |-> 6xHgap (virtual) --->48xHrow (virtual) -->80xHcel (virtual) -->4xHcat (real) from p84 TDR
 195 //   |  |______|   |____|   *    |______| |                                                                                                  |-->2xHano (real) from p84 TDR
 196 //   |____________________________________|                                                                                                  |-->1xHpad (real) from p84 TDR
 197 //                                                       --->Z
 198   hmp->AddNode(sbo ,1,new TGeoTranslation(   0*mm,   0*mm, -73.75*mm));                     //p.84 TDR
 199      sbo->AddNode(hon ,1,new TGeoTranslation(  0*mm,0*mm,      0*mm)); //2072P1
 200      sbo->AddNode(cov ,1,new TGeoTranslation(  0*mm,0*mm,    +25*mm));
 201      sbo->AddNode(cov ,2,new TGeoTranslation(  0*mm,0*mm,    -25*mm));
 202   hmp->AddNode(rad,2,new TGeoTranslation(   0*mm,+434*mm, -12.00*mm));
 203   hmp->AddNode(rad,1,new TGeoTranslation(   0*mm,   0*mm, -12.00*mm));
 204   hmp->AddNode(rad,0,new TGeoTranslation(   0*mm,-434*mm, -12.00*mm));
 205     rad->AddNode(neo,1,new TGeoTranslation(   0*mm,   0*mm, -10.0*mm));
 206     rad->AddNode(win,1,new TGeoTranslation(   0*mm,   0*mm,   9.5*mm));
 207     rad->AddNode(si1,1,new TGeoTranslation(   0*mm,-204*mm,  -0.5*mm)); rad->AddNode(si1,2,new TGeoTranslation(   0*mm,+204*mm,  -0.5*mm));
 208     rad->AddNode(si2,1,new TGeoTranslation(-660*mm,   0*mm,  -0.5*mm)); rad->AddNode(si2,2,new TGeoTranslation(+660*mm,   0*mm,  -0.5*mm));
 209     for(Int_t i=0;i<3;i++) for(Int_t j=0;j<10;j++) rad->AddNode(spa,10*i+j,new TGeoTranslation(-1330*mm/2+116*mm+j*122*mm,(i-1)*105*mm,-0.5*mm));
 210   hmp->AddNode(fr4,1,new TGeoTranslation(   0*mm,   0*mm,   9.00*mm));                     //p.84 TDR
 211   for(int i=1;i<=322;i++)  fr4->AddNode(col,i,new TGeoCombiTrans( 0*mm, -1296/2*mm+i*4*mm,-5*mm,rot)); //F4 2043P1
 212                            fr4->AddNode(f4a,1,new TGeoTranslation(   0*mm,0*mm, 2.5*mm));
 213                                         f4a->AddNode(f4i,1,new TGeoTranslation(   0*mm,0*mm,   0*mm));
 214   hmp->AddNode(sec,4,new TGeoTranslation(-335*mm,+433*mm,  78.6*mm)); hmp->AddNode(sec,5,new TGeoTranslation(+335*mm,+433*mm,  78.6*mm));
 215   hmp->AddNode(sec,2,new TGeoTranslation(-335*mm,   0*mm,  78.6*mm)); hmp->AddNode(sec,3,new TGeoTranslation(+335*mm,   0*mm,  78.6*mm));
 216   hmp->AddNode(sec,0,new TGeoTranslation(-335*mm,-433*mm,  78.6*mm)); hmp->AddNode(sec,1,new TGeoTranslation(+335*mm,-433*mm,  78.6*mm));
 217     sec->AddNode(gap,1,new TGeoTranslation(0,0,0.*mm));
 218       cel->AddNode(cat,1,new TGeoCombiTrans (0,  3.15*mm , -2.70*mm , rot)); //4 cathode wires
 219       cel->AddNode(ano,1,new TGeoCombiTrans (0,  2.00*mm , -0.29*mm , rot)); //2 anod wires
 220       cel->AddNode(cat,2,new TGeoCombiTrans (0,  1.05*mm , -2.70*mm , rot));
 221       cel->AddNode(cat,3,new TGeoCombiTrans (0, -1.05*mm , -2.70*mm , rot));
 222       cel->AddNode(ano,2,new TGeoCombiTrans (0, -2.00*mm , -0.29*mm , rot));
 223       cel->AddNode(cat,4,new TGeoCombiTrans (0, -3.15*mm , -2.70*mm , rot));
 224       cel->AddNode(pad,1,new TGeoTranslation(0,  0.00*mm ,  2.25*mm));       //1 pad
 225
 226   hmp->AddNode(fr1,1,new TGeoTranslation(0.,0.,(80.+1.7)*mm+58.3*mm/2.));
 227                 fr1->AddNode(fr1up,1,new TGeoTranslation(0.,0.,(58.3*mm-20.00*mm)/2.));
 228
 229                 fr1->AddNode(fr1perUpBig,0,new TGeoTranslation(0.,(1385-37-35)*mm/2.,(58.3*mm-20.00*2*mm-10.0*mm)/2.));
 230                 fr1->AddNode(fr1perUpSma,0,new TGeoTranslation((1426-37-35)*mm/2.,0.,(58.3*mm-20.00*2*mm-10.0*mm)/2.));
 231                 fr1->AddNode(fr1perUpBig,1,new TGeoTranslation(0.,-(1385-37-35)*mm/2.,(58.3*mm-20.00*2*mm-10.0*mm)/2.));
 232                 fr1->AddNode(fr1perUpSma,1,new TGeoTranslation(-(1426-37-35)*mm/2.,0.,(58.3*mm-20.00*2*mm-10.0*mm)/2.));
 233
 234           fr1->AddNode(fr1perDowBig,0,new TGeoTranslation(0.,(1385-37-46)*mm/2.,(-58.3*mm+2.3*mm)/2.));
 235                 fr1->AddNode(fr1perDowSma,0,new TGeoTranslation((1426-37-46)*mm/2.,0.,(-58.3*mm+2.3*mm)/2.));
 236           fr1->AddNode(fr1perDowBig,1,new TGeoTranslation(0.,-(1385-37-46)*mm/2.,(-58.3*mm+2.3*mm)/2.));
 237                 fr1->AddNode(fr1perDowSma,1,new TGeoTranslation(-(1426-37-46)*mm/2.,0.,(-58.3*mm+2.3*mm)/2.));
 238
 239
 240           fr1->AddNode(ppf,4,new TGeoTranslation(-335*mm,433*mm,(-58.3+38.3)*mm/2.));  fr1->AddNode(ppf,5,new TGeoTranslation(335*mm,433*mm,(-58.3+38.3)*mm/2.));
 241           fr1->AddNode(ppf,2,new TGeoTranslation(-335*mm,0.,(-58.3+38.3)*mm/2.));      fr1->AddNode(ppf,3,new TGeoTranslation(335*mm,0.,(-58.3+38.3)*mm/2.));
 242           fr1->AddNode(ppf,0,new TGeoTranslation(-335*mm,-433*mm,(-58.3+38.3)*mm/2.)); fr1->AddNode(ppf,1,new TGeoTranslation(335*mm,-433*mm,(-58.3+38.3)*mm/2.));
 243
 244
 245
 246
 247
 248
 249 // ^ Y  single cell                                                5.5mm CH4 = 1*mm CsI + 4.45*mm CsI x cath +0.05*mm safety margin
 250 // |      ______________________________
 251 // |     |                              |          ^                            ||
 252 //       |                              | 1.05mm                                ||
 253 // 2.2*mm| xxxxxxxxxxxxxxxxxxxxxxxxxxxx |--              50um  x                || cat shift  x=0mm , y= 3.15mm , z=-2.70mm
 254 //       |                              |                                       ||
 255 //       |                              |                                       ||
 256 // __    |  ..........................  | 2.1mm                    20un .       ||  ano shift x=0mm , y= 2.00mm , z=-0.29mm
 257 //       |                              |                                       ||
 258 //       |                              |                                       ||
 259 //       | xxxxxxxxxxxxxxxxxxxxxxxxxxxx |--                    x                ||  cat shift x=0mm , y= 1.05mm , z=-2.70mm
 260 //       |                              |                                       ||
 261 //       |                              |         8.4mm                         ||
 262 // 4*mm  |                              | 2.1mm                                 ||  pad shift x=0mm , y= 0.00mm , z=2.25*mm
 263 //       |                              |                                       ||
 264 //       |                              |                                       ||
 265 //       | xxxxxxxxxxxxxxxxxxxxxxxxxxxx |--                    x                ||  cat shift x=0mm , y=-1.05mm , z=-2.70mm
 266 //       |                              |                                       ||
 267 //       |                              |                                       ||
 268 // __    |  ..........................  | 2.1mm                         . 2.04mm||  ano shift x=0mm , y=-2.00mm , z=-0.29mm
 269 //       |                              |                                       ||
 270 //       |                              |                                       ||
 271 //       | xxxxxxxxxxxxxxxxxxxxxxxxxxxx |--                    x    4.45mm      ||  cat shift x=0mm , y=-3.15mm , z=-2.70mm
 272 // 2.2*mm|                              |                                       ||
 273 //       |                              | 1.05mm                                ||
 274 //       |______________________________|          v                            ||
 275 //       <             8 mm             >
 276 //                                   ----->X                                 ----->Z
 277   ppf->AddNode(lar,0,new TGeoTranslation(-224.5*mm,-151.875*mm,  0.*mm));
 278   ppf->AddNode(lar,1,new TGeoTranslation(-224.5*mm,- 50.625*mm,  0.*mm));
 279   ppf->AddNode(lar,2,new TGeoTranslation(-224.5*mm,+ 50.625*mm,  0.*mm));
 280   ppf->AddNode(lar,3,new TGeoTranslation(-224.5*mm,+151.875*mm,  0.*mm));
 281   ppf->AddNode(lar,4,new TGeoTranslation(+224.5*mm,-151.875*mm,  0.*mm));
 282   ppf->AddNode(lar,5,new TGeoTranslation(+224.5*mm,- 50.625*mm,  0.*mm));
 283   ppf->AddNode(lar,6,new TGeoTranslation(+224.5*mm,+ 50.625*mm,  0.*mm));
 284   ppf->AddNode(lar,7,new TGeoTranslation(+224.5*mm,+151.875*mm,  0.*mm));
 285   ppf->AddNode(smo,0,new TGeoTranslation(- 65.0*mm,-151.875*mm,  0.*mm));
 286   ppf->AddNode(smo,1,new TGeoTranslation(- 65.0*mm,- 50.625*mm,  0.*mm));
 287   ppf->AddNode(smo,2,new TGeoTranslation(- 65.0*mm,+ 50.625*mm,  0.*mm));
 288   ppf->AddNode(smo,3,new TGeoTranslation(- 65.0*mm,+151.875*mm,  0.*mm));
 289   ppf->AddNode(smo,4,new TGeoTranslation(+ 65.0*mm,-151.875*mm,  0.*mm));
 290   ppf->AddNode(smo,5,new TGeoTranslation(+ 65.0*mm,- 50.625*mm,  0.*mm));
 291   ppf->AddNode(smo,6,new TGeoTranslation(+ 65.0*mm,+ 50.625*mm,  0.*mm));
 292   ppf->AddNode(smo,7,new TGeoTranslation(+ 65.0*mm,+151.875*mm,  0.*mm));
 293
 294 hmp->AddNode(fr3,1,new TGeoTranslation(0.,0.,(80.-29.)*mm-34.*mm/2));
 295          fr3->AddNode( fr3up,1,    new TGeoTranslation(0.,  0.,  7*mm));
 296          fr3->AddNode(fr3down,1,new TGeoTranslation(0.,  0., -10*mm));
 297
 298   AliDebug(1,"Stop v2. HMPID option");
 299 }//CreateGeometry()
 300 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 301 void AliHMPIDv2::Init()
 302 {
 303 // This methode defines ID for sensitive volumes, i.e. such geometry volumes for which there are if(gMC->CurrentVolID()==XXX) statements in StepManager()
 304 // Arguments: none
 305 //   Returns: none
 306   AliDebug(1,"Start v2 HMPID.");
 307   fIdPad     = gMC->VolId("Hpad");
 308   fIdCell    = gMC->VolId("Hcel");
 309   AliDebug(1,"Stop v2 HMPID.");
 310 }
 311 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 312 void AliHMPIDv2::DefineOpticalProperties()
 313 {
 314 // Optical properties definition.
 315   const Int_t kNbins=30;       //number of photon energy points
 316   Float_t emin=5.5,emax=8.5;         //Photon energy range,[eV]
 317   Float_t aEckov [kNbins];
 318   Float_t aAbsRad[kNbins], aAbsWin[kNbins], aAbsGap[kNbins], aAbsMet[kNbins];
 319   Float_t aIdxRad[kNbins], aIdxWin[kNbins], aIdxGap[kNbins], aIdxMet[kNbins], aIdxPc[kNbins];
 320   Float_t                                                    aQeAll [kNbins], aQePc [kNbins];
 321
 322   TF2 *pRaIF=new TF2("HidxRad","sqrt(1+0.554*(1239.84/x)^2/((1239.84/x)^2-5796)-0.0005*(y-20))"                                       ,emin,emax,0,50); //DiMauro mail temp 0-50 degrees C
 323   TF1 *pWiIF=new TF1("HidxWin","sqrt(1+46.411/(10.666*10.666-x*x)+228.71/(18.125*18.125-x*x))"                                        ,emin,emax);      //SiO2 idx TDR p.35
 324   TF1 *pGaIF=new TF1("HidxGap","1+0.12489e-6/(2.62e-4 - x*x/1239.84/1239.84)"                                                         ,emin,emax);      //?????? from where
 325
 326   TF1 *pRaAF=new TF1("HabsRad","(x<7.8)*(gaus+gaus(3))+(x>=7.8)*0.0001"                                                               ,emin,emax);  //fit from DiMauro data 28.10.03
 327   pRaAF->SetParameters(3.20491e16,-0.00917890,0.742402,3035.37,4.81171,0.626309);
 328   TF1 *pWiAF=new TF1("HabsWin","(x<8.2)*(818.8638-301.0436*x+36.89642*x*x-1.507555*x*x*x)+(x>=8.2)*0.0001"                            ,emin,emax);  //fit from DiMauro data 28.10.03
 329   TF1 *pGaAF=new TF1("HabsGap","(x<7.75)*6512.399+(x>=7.75)*3.90743e-2/(-1.655279e-1+6.307392e-2*x-8.011441e-3*x*x+3.392126e-4*x*x*x)",emin,emax);  //????? from where
 330
 331   TF1 *pQeF =new TF1("Hqe"    ,"0+(x>6.07267)*0.344811*(1-exp(-1.29730*(x-6.07267)))"                                                 ,emin,emax);  //fit from DiMauro data 28.10.03
 332
 333   TString title=GetTitle();
 334   Bool_t isFlatIdx=title.Contains("FlatIdx");
 335
 336   for(Int_t i=0;i<kNbins;i++){
 337     Float_t eV=emin+0.1*i;  //Ckov energy in eV
 338     aEckov [i] =1e-9*eV;    //Ckov energy in GeV
 339     aAbsRad[i]=pRaAF->Eval(eV); (isFlatIdx)? aIdxRad[i]=1.292: aIdxRad[i]=pRaIF->Eval(eV,20);
 340     aAbsWin[i]=pWiAF->Eval(eV);              aIdxWin[i]=pWiIF->Eval(eV);
 341     aAbsGap[i]=pGaAF->Eval(eV);              aIdxGap[i]=pGaIF->Eval(eV);
 342     aQeAll[i] =1;                     //QE for all other materials except for PC must be 1.
 343     aAbsMet[i] =0.0001;                aIdxMet[i]=0;                                             //metal ref idx must be 0 in order to reflect photon
 344                                        aIdxPc [i]=1;           aQePc [i]=pQeF->Eval(eV);         //PC ref idx must be 1 in order to apply photon to QE conversion
 345
 346   }
 347   gMC->SetCerenkov((*fIdtmed)[kC6F14]    , kNbins, aEckov, aAbsRad  , aQeAll , aIdxRad );
 348   gMC->SetCerenkov((*fIdtmed)[kSiO2]     , kNbins, aEckov, aAbsWin  , aQeAll , aIdxWin );
 349   gMC->SetCerenkov((*fIdtmed)[kCH4]      , kNbins, aEckov, aAbsGap  , aQeAll , aIdxGap );
 350   gMC->SetCerenkov((*fIdtmed)[kCu]       , kNbins, aEckov, aAbsMet  , aQeAll , aIdxMet );
 351   gMC->SetCerenkov((*fIdtmed)[kW]        , kNbins, aEckov, aAbsMet  , aQeAll , aIdxMet ); //n=0 means reflect photons
 352   gMC->SetCerenkov((*fIdtmed)[kCsI]      , kNbins, aEckov, aAbsMet  , aQePc  , aIdxPc  ); //n=1 means convert photons
 353   gMC->SetCerenkov((*fIdtmed)[kAl]       , kNbins, aEckov, aAbsMet  , aQeAll , aIdxMet );
 354   delete pRaAF;delete pWiAF;delete pGaAF; delete pRaIF; delete pWiIF; delete pGaIF; delete pQeF;
 355 }
 356 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 357 Bool_t AliHMPIDv2::IsLostByFresnel()
 358 {
 359 // Calculate probability for the photon to be lost by Fresnel reflection.
 360   TLorentzVector p4;
 361   Double_t mom[3],localMom[3];
 362   gMC->TrackMomentum(p4);   mom[0]=p4(1);   mom[1]=p4(2);   mom[2]=p4(3);
 363   localMom[0]=0; localMom[1]=0; localMom[2]=0;
 364   gMC->Gmtod(mom,localMom,2);
 365   Double_t localTc    = localMom[0]*localMom[0]+localMom[2]*localMom[2];
 366   Double_t localTheta = TMath::ATan2(TMath::Sqrt(localTc),localMom[1]);
 367   Double_t cotheta = TMath::Abs(TMath::Cos(localTheta));
 368   if(gMC->GetRandom()->Rndm() < Fresnel(p4.E()*1e9,cotheta,1)){
 369     AliDebug(1,"Photon lost");
 370     return kTRUE;
 371   }else
 372     return kFALSE;
 373 }//IsLostByFresnel()
 374 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 375 void AliHMPIDv2::GenFee(Float_t qtot)
 376 {
 377 // Generate FeedBack photons for the current particle. To be invoked from StepManager().
 378 // eloss=0 means photon so only pulse height distribution is to be analysed.
 379   TLorentzVector x4;
 380   gMC->TrackPosition(x4);
 381   Int_t iNphotons=gMC->GetRandom()->Poisson(0.02*qtot);  //# of feedback photons is proportional to the charge of hit
 382   AliDebug(1,Form("N photons=%i",iNphotons));
 383   Int_t j;
 384   Float_t cthf, phif, enfp = 0, sthf, e1[3], e2[3], e3[3], vmod, uswop,dir[3], phi,pol[3], mom[4];
 385 //Generate photons
 386   for(Int_t i=0;i<iNphotons;i++){//feedbacks loop
 387     Double_t ranf[2];
 388     gMC->GetRandom()->RndmArray(2,ranf);    //Sample direction
 389     cthf=ranf[0]*2-1.0;
 390     if(cthf<0) continue;
 391     sthf = TMath::Sqrt((1 - cthf) * (1 + cthf));
 392     phif = ranf[1] * 2 * TMath::Pi();
 393
 394     if(Double_t randomNumber=gMC->GetRandom()->Rndm()<=0.57)
 395       enfp = 7.5e-9;
 396     else if(randomNumber<=0.7)
 397       enfp = 6.4e-9;
 398     else
 399       enfp = 7.9e-9;
 400
 401
 402     dir[0] = sthf * TMath::Sin(phif);    dir[1] = cthf;    dir[2] = sthf * TMath::Cos(phif);
 403     gMC->Gdtom(dir, mom, 2);
 404     mom[0]*=enfp;    mom[1]*=enfp;    mom[2]*=enfp;
 405     mom[3] = TMath::Sqrt(mom[0]*mom[0]+mom[1]*mom[1]+mom[2]*mom[2]);
 406
 407     // Polarisation
 408     e1[0]=      0;    e1[1]=-dir[2];    e1[2]= dir[1];
 409     e2[0]=-dir[1];    e2[1]= dir[0];    e2[2]=      0;
 410     e3[0]= dir[1];    e3[1]=      0;    e3[2]=-dir[0];
 411
 412     vmod=0;
 413     for(j=0;j<3;j++) vmod+=e1[j]*e1[j];
 414     if (!vmod) for(j=0;j<3;j++) {
 415       uswop=e1[j];
 416       e1[j]=e3[j];
 417       e3[j]=uswop;
 418     }
 419     vmod=0;
 420     for(j=0;j<3;j++) vmod+=e2[j]*e2[j];
 421     if (!vmod) for(j=0;j<3;j++) {
 422       uswop=e2[j];
 423       e2[j]=e3[j];
 424       e3[j]=uswop;
 425     }
 426
 427     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;
 428     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;
 429
 430     phi = gMC->GetRandom()->Rndm()* 2 * TMath::Pi();
 431     for(j=0;j<3;j++) pol[j]=e1[j]*TMath::Sin(phi)+e2[j]*TMath::Cos(phi);
 432     gMC->Gdtom(pol, pol, 2);
 433     Int_t outputNtracksStored;
 434     gAlice->GetMCApp()->PushTrack(1,                             //transport
 435                      gAlice->GetMCApp()->GetCurrentTrackNumber(),//parent track
 436                      50000051,                                   //PID
 437                      mom[0],mom[1],mom[2],mom[3],                //track momentum
 438                      x4.X(),x4.Y(),x4.Z(),x4.T(),                //track origin
 439                      pol[0],pol[1],pol[2],                       //polarization
 440                      kPFeedBackPhoton,                           //process ID
 441                      outputNtracksStored,                        //on return how many new photons stored on stack
 442                      1.0);                                       //weight
 443   }//feedbacks loop
 444   AliDebug(1,"Stop.");
 445 }//GenerateFeedbacks()
 446 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 447 void AliHMPIDv2::Hits2SDigits()
 448 {
 449 // Interface method ivoked from AliSimulation to create a list of sdigits corresponding to list of hits. Every hit generates one or more sdigits.
 450 // Arguments: none
 451 //   Returns: none
 452   AliDebug(1,"Start.");
 453   for(Int_t iEvt=0;iEvt < GetLoader()->GetRunLoader()->GetNumberOfEvents();iEvt++){                //events loop
 454     GetLoader()->GetRunLoader()->GetEvent(iEvt);                          //get next event
 455
 456     if(!GetLoader()->TreeH()) {GetLoader()->LoadHits();                    }
 457     if(!GetLoader()->TreeS()) {GetLoader()->MakeTree("S"); MakeBranch("S");}//to
 458
 459     for(Int_t iEnt=0;iEnt<GetLoader()->TreeH()->GetEntries();iEnt++){//prims loop
 460       GetLoader()->TreeH()->GetEntry(iEnt);
 461       Hit2Sdi(Hits(),SdiLst());
 462     }//prims loop
 463     GetLoader()->TreeS()->Fill();
 464     GetLoader()->WriteSDigits("OVERWRITE");
 465     SdiReset();
 466   }//events loop
 467   GetLoader()->UnloadHits();
 468   GetLoader()->UnloadSDigits();
 469   AliDebug(1,"Stop.");
 470 }//Hits2SDigits()
 471 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 472 void AliHMPIDv2::Hit2Sdi(TClonesArray *pHitLst,TClonesArray *pSdiLst)
 473 {
 474 // Converts list of hits to list of sdigits.
 475 // Arguments: pHitLst  - list of hits provided not empty
 476 //            pSDigLst - list of sdigits where to store the results
 477 //   Returns: none
 478   for(Int_t iHit=0;iHit<pHitLst->GetEntries();iHit++){         //hits loop
 479     AliHMPIDHit *pHit=(AliHMPIDHit*)pHitLst->At(iHit);         //get pointer to current hit
 480     pHit->Hit2Sdi(pSdiLst);                                    //convert this hit to list of sdigits
 481   }//hits loop loop
 482 }//Hits2Sdi()
 483 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 484 void AliHMPIDv2::Digits2Raw()
 485 {
 486 // Interface method invoked by AliSimulation to create raw data streams from digits. Events loop is done in AliSimulation
 487 // Arguments: none
 488 //   Returns: none
 489   AliDebug(1,"Start.");
 490   GetLoader()->LoadDigits();
 491   TTree * treeD = GetLoader()->TreeD();
 492   if(!treeD) {
 493     AliError("No digits tree!");
 494     return;
 495   }
 496   treeD->GetEntry(0);
 497
 498   AliHMPIDDigit::WriteRaw(DigLst());
 499
 500   GetLoader()->UnloadDigits();
 501   AliDebug(1,"Stop.");
 502 }//Digits2Raw()
 503 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 504 Float_t AliHMPIDv2::Fresnel(Float_t ene,Float_t pdoti, Bool_t pola)
 505 {
 506 // Correction for Fresnel   ???????????
 507 // Arguments:   ene - photon energy [GeV],
 508 //              PDOTI=COS(INC.ANG.), PDOTR=COS(POL.PLANE ROT.ANG.)
 509 //   Returns:
 510     Float_t en[36] = {5.0,5.1,5.2,5.3,5.4,5.5,5.6,5.7,5.8,5.9,6.0,6.1,6.2,
 511                       6.3,6.4,6.5,6.6,6.7,6.8,6.9,7.0,7.1,7.2,7.3,7.4,7.5,7.6,7.7,
 512                       7.8,7.9,8.0,8.1,8.2,8.3,8.4,8.5};
 513     Float_t csin[36] = {2.14,2.21,2.33,2.48,2.76,2.97,2.99,2.59,2.81,3.05,
 514                         2.86,2.53,2.55,2.66,2.79,2.96,3.18,3.05,2.84,2.81,2.38,2.11,
 515                         2.01,2.13,2.39,2.73,3.08,3.15,2.95,2.73,2.56,2.41,2.12,1.95,
 516                         1.72,1.53};
 517     Float_t csik[36] = {0.,0.,0.,0.,0.,0.196,0.408,0.208,0.118,0.49,0.784,0.543,
 518                         0.424,0.404,0.371,0.514,0.922,1.102,1.139,1.376,1.461,1.253,0.878,
 519                         0.69,0.612,0.649,0.824,1.347,1.571,1.678,1.763,1.857,1.824,1.824,
 520                         1.714,1.498};
 521     Float_t xe=ene;
 522     Int_t  j=Int_t(xe*10)-49;
 523     Float_t cn=csin[j]+((csin[j+1]-csin[j])/0.1)*(xe-en[j]);
 524     Float_t ck=csik[j]+((csik[j+1]-csik[j])/0.1)*(xe-en[j]);
 525
 526     //FORMULAE FROM HANDBOOK OF OPTICS, 33.23 OR
 527     //W.R. HUNTER, J.O.S.A. 54 (1964),15 , J.O.S.A. 55(1965),1197
 528
 529     Float_t sinin=TMath::Sqrt(1-pdoti*pdoti);
 530     Float_t tanin=sinin/pdoti;
 531
 532     Float_t c1=cn*cn-ck*ck-sinin*sinin;
 533     Float_t c2=4*cn*cn*ck*ck;
 534     Float_t aO=TMath::Sqrt(0.5*(TMath::Sqrt(c1*c1+c2)+c1));
 535     Float_t b2=0.5*(TMath::Sqrt(c1*c1+c2)-c1);
 536
 537     Float_t rs=((aO-pdoti)*(aO-pdoti)+b2)/((aO+pdoti)*(aO+pdoti)+b2);
 538     Float_t rp=rs*((aO-sinin*tanin)*(aO-sinin*tanin)+b2)/((aO+sinin*tanin)*(aO+sinin*tanin)+b2);
 539
 540
 541     //CORRECTION FACTOR FOR SURFACE ROUGHNESS
 542     //B.J. STAGG  APPLIED OPTICS, 30(1991),4113
 543
 544     Float_t sigraf=18.;
 545     Float_t lamb=1240/ene;
 546     Float_t fresn;
 547
 548     Float_t  rO=TMath::Exp(-(4*TMath::Pi()*pdoti*sigraf/lamb)*(4*TMath::Pi()*pdoti*sigraf/lamb));
 549
 550     if(pola)
 551     {
 552         Float_t pdotr=0.8;                                 //DEGREE OF POLARIZATION : 1->P , -1->S
 553         fresn=0.5*(rp*(1+pdotr)+rs*(1-pdotr));
 554     }
 555     else
 556         fresn=0.5*(rp+rs);
 557
 558     fresn = fresn*rO;
 559     return fresn;
 560 }//Fresnel()
 561 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 562 void AliHMPIDv2::Print(Option_t *option)const
 563 {
 564 // Debug printout
 565   TObject::Print(option);
 566 }//void AliHMPID::Print(Option_t *option)const
 567 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 568 Bool_t AliHMPIDv2::Raw2SDigits(AliRawReader *pRR)
 569 {
 570 // Interface methode ivoked from AliSimulation to create a list of sdigits from raw digits. Events loop is done in AliSimulation
 571 // Arguments: pRR- raw reader
 572 //   Returns: kTRUE on success (currently ignored in AliSimulation::ConvertRaw2SDigits())
 573   AliHMPIDDigit sdi; //tmp sdigit, raw digit will be converted to it
 574
 575   if(!GetLoader()->TreeS()) {MakeTree("S");  MakeBranch("S");}
 576
 577   TClonesArray *pSdiLst=SdiLst(); Int_t iSdiCnt=0; //tmp list of sdigits for all chambers
 578   pRR->Select("HMPID",0,13);//select all HMPID DDL files
 579   UInt_t w32=0;
 580   while(pRR->ReadNextInt(w32)){//raw records loop (in selected DDL files)
 581     UInt_t ddl=pRR->GetDDLID(); //returns 0,1,2 ... 13
 582     if(!sdi.Raw(ddl,w32,pRR)) continue;
 583     new((*pSdiLst)[iSdiCnt++]) AliHMPIDDigit(sdi); //add this digit to the tmp list
 584   }//raw records loop
 585   GetLoader()->TreeS()->Fill(); GetLoader()->WriteSDigits("OVERWRITE");//write out sdigits
 586   SdiReset();
 587   return kTRUE;
 588 }//Raw2SDigits
 589 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 590 void AliHMPIDv2::StepCount()
 591 {
 592 // Count number of ckovs created
 593 }
 594 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 595 void AliHMPIDv2::StepHistory()
 596 {
 597 // This methode is invoked from StepManager() in order to print out
 598   static Int_t iStepN;
 599   const char *sParticle;
 600   switch(gMC->TrackPid()){
 601     case kProton:      sParticle="PROTON"    ;break;
 602     case kNeutron:     sParticle="neutron"   ;break;
 603     case kGamma:       sParticle="gamma"     ;break;
 604     case 50000050:     sParticle="CKOV"      ;break;
 605     case kPi0:         sParticle="Pi0"       ;break;
 606     case kPiPlus:      sParticle="Pi+"       ;break;
 607     case kPiMinus:     sParticle="Pi-"       ;break;
 608     case kElectron:    sParticle="electron"  ;break;
 609     default:           sParticle="not known" ;break;
 610   }
 611
 612   TString flag="fanny combination";
 613   if(gMC->IsTrackAlive())
 614       if(gMC->IsTrackEntering())      flag="enters to";
 615       else if(gMC->IsTrackExiting())  flag="exits from";
 616       else if(gMC->IsTrackInside())   flag="inside";
 617   else
 618       if(gMC->IsTrackStop())          flag="stoped in";
 619
 620
 621
 622
 623   Int_t vid=0,copy=0;
 624   TString path=gMC->CurrentVolName(); path.Prepend("-");path.Prepend(gMC->CurrentVolOffName(1));//current volume and his mother are always there
 625   vid=gMC->CurrentVolOffID(2,copy);  if(vid) {path.Prepend("-");path.Prepend(gMC->VolName(vid));}
 626   vid=gMC->CurrentVolOffID(3,copy);  if(vid) {path.Prepend("-");path.Prepend(gMC->VolName(vid));}
 627
 628
 629   Printf("Step %i: %s (%i) %s %s m=%.6f GeV q=%.1f dEdX=%.4f Etot=%.4f",iStepN,sParticle,gMC->TrackPid(),flag.Data(),path.Data(),gMC->TrackMass(),gMC->TrackCharge(),gMC->Edep()*1e9,gMC->Etot());
 630
 631   Double_t gMcTrackPos[3]; gMC->TrackPosition(gMcTrackPos[0],gMcTrackPos[1],gMcTrackPos[2]);
 632   Double_t  gMcTrackPosLoc[3]; gMC->Gmtod(gMcTrackPos,gMcTrackPosLoc,1);
 633   Printf("gMC Track Position (MARS) x: %5.3lf, y: %5.3lf, z: %5.3lf (r: %5.3lf) ---> (LOC) x: %5.3f, y: %5.3f, z: %5.3f",gMcTrackPos[0],gMcTrackPos[1],gMcTrackPos[2],TMath::Sqrt(gMcTrackPos[0]*gMcTrackPos[0]+gMcTrackPos[1]*gMcTrackPos[1]+gMcTrackPos[2]*gMcTrackPos[2]),gMcTrackPosLoc[0],gMcTrackPosLoc[1],gMcTrackPosLoc[2]);
 634
 635
 636
 637   Printf("Step %i: tid=%i flags alive=%i disap=%i enter=%i exit=%i inside=%i out=%i stop=%i new=%i",
 638                             iStepN, gAlice->GetMCApp()->GetCurrentTrackNumber(),
 639                             gMC->IsTrackAlive(), gMC->IsTrackDisappeared(),gMC->IsTrackEntering(), gMC->IsTrackExiting(),
 640                             gMC->IsTrackInside(),gMC->IsTrackOut(),        gMC->IsTrackStop(),     gMC->IsNewTrack());
 641
 642   Float_t a,z,den,rad,abs; a=z=den=rad=abs=-1;
 643   Int_t mid=gMC->CurrentMaterial(a,z,den,rad,abs);
 644   Printf("Step %i: mid=%i a=%7.2f z=%7.2f den=%9.4f rad=%9.2f abs=%9.2f\n\n",iStepN,mid,a,z,den,rad,abs);
 645
 646   TArrayI proc;  gMC->StepProcesses(proc);
 647   Printf("Processes in this step:");
 648   for ( int i = 0 ; i < proc.GetSize(); i++)
 649   {
 650     Printf("%s",TMCProcessName[proc.At(i)]);
 651   }
 652   Printf("End process list");
 653
 654   iStepN++;
 655 }//StepHistory()
 656 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 657 void AliHMPIDv2::StepManager()
 658 {
 659 // Full Step Manager.
 660 // Arguments: none
 661 //   Returns: none
 662 //  StepHistory(); return; //uncomment to print tracks history
 663  //  StepCount(); return;     //uncomment to count photons
 664
 665   Int_t   copy; //volume copy aka node
 666
 667 //Treat photons
 668   if((gMC->TrackPid()==50000050||gMC->TrackPid()==50000051)&&gMC->CurrentVolID(copy)==fIdPad){   //photon (Ckov or feedback) hit PC (fIdPad)
 669     if(gMC->Edep()>0){                                                                           //photon survided QE test i.e. produces electron
 670       if(IsLostByFresnel()){ gMC->StopTrack(); return;}                                          //photon lost due to fersnel reflection on PC
 671                        gMC->CurrentVolOffID(5,copy);                                             //current chamber since geomtry tree is Hmp-Hsec-Hgap-Hrow-Hcel-Hpad
 672       Int_t   tid=     gMC->GetStack()->GetCurrentTrackNumber();                                 //take TID
 673       Int_t   pid=     gMC->TrackPid();                                                          //take PID
 674       Float_t etot=    gMC->Etot();                                                              //total hpoton energy, [GeV]
 675       Double_t x[3];   gMC->TrackPosition(x[0],x[1],x[2]);                                       //take MARS position at entrance to PC
 676       Float_t xl,yl;   AliHMPIDParam::Instance()->Mars2Lors(copy,x,xl,yl);                       //take LORS position
 677       new((*fHits)[fNhits++])AliHMPIDHit(copy,etot,pid,tid,xl,yl,x);                             //HIT for photon, position at P, etot will be set to Q
 678       if(fDoFeed) GenFee(etot);                                                                  //generate feedback photons etot is modified in hit ctor to Q of hit
 679     }//photon hit PC and DE >0
 680   }//photon hit PC
 681
 682 //Treat charged particles
 683   static Float_t eloss;                                                                           //need to store mip parameters between different steps
 684   static Double_t in[3];
 685   if(gMC->TrackCharge() && gMC->CurrentVolID(copy)==fIdCell){                                     //charged particle in amplification gap (fIdCell)
 686     if(gMC->IsTrackEntering()||gMC->IsNewTrack()) {                                               //entering or newly created
 687       eloss=0;                                                                                    //reset Eloss collector
 688       gMC->TrackPosition(in[0],in[1],in[2]);                                                      //take position at the entrance
 689     }else if(gMC->IsTrackExiting()||gMC->IsTrackStop()||gMC->IsTrackDisappeared()){               //exiting or disappeared
 690       eloss              +=gMC->Edep();                                                           //take into account last step Eloss
 691                           gMC->CurrentVolOffID(4,copy);                                           //take current chamber since geometry tree is Hmp-Hsec-Hgap-Hrow-Hcel
 692       Int_t tid=          gMC->GetStack()->GetCurrentTrackNumber();                               //take TID
 693       Int_t pid=          gMC->TrackPid();                                                        //take PID
 694       Double_t out[3];    gMC->TrackPosition(out[0],out[1],out[2]);                               //take MARS position at exit
 695       out[0]=0.5*(out[0]+in[0]);                                                                  //>
 696       out[1]=0.5*(out[1]+in[1]);                                                                  //take hit position at the anod plane
 697       out[2]=0.5*(out[2]+in[2]);                                                                  //>
 698       Float_t xl,yl;AliHMPIDParam::Instance()->Mars2Lors(copy,out,xl,yl);                         //take LORS position
 699       new((*fHits)[fNhits++])AliHMPIDHit(copy,eloss,pid,tid,xl,yl,out);                           //HIT for MIP, position near anod plane, eloss will be set to Q
 700       if(fDoFeed) GenFee(eloss);                                                                  //generate feedback photons
 701     }else                                                                                         //just going inside
 702       eloss          += gMC->Edep();                                                              //collect this step eloss
 703   }//MIP in GAP
 704 }//StepManager()
 705 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 706 void AliHMPIDv2::TestPoint(Int_t ch,Float_t x,Float_t y)
 707 {
 708 // Utility method to check the validity of geometry by poviding some crucial points
 709 // Arguments: ch,x,y- crucial point definition (cm) in LORS
 710 //   Returns: none
 711   Double_t mars[3];
 712   AliHMPIDParam::Instance()->Lors2Mars(ch,x,y,mars);
 713   Printf("(ch=%i,locX=%.2f,locY=%.2f) %s",ch,x,y,gGeoManager->FindNode(mars[0],mars[1],mars[2])->GetName());
 714 }//TestPoint()
 715 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 716 void AliHMPIDv2::TestGeom()
 717 {
 718 //
 719 // Test method to check geometry
 720 //
 721   //TGeoManager::Import("misaligned_geometry.root");
 722   TGeoManager::Import("geometry.root");
 723   for(Int_t ch=AliHMPIDParam::kMinCh;ch<=AliHMPIDParam::kMaxCh;ch++)
 724     TestPoint(ch,0,0);
 725 }//TestPoint()
 726 //+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 727
 728 void  AliHMPIDv2::IdealPosition(Int_t iCh,TGeoHMatrix *pMatrix)       //ideal position of given chamber
 729 {
 730 // Construct ideal position matrix for a given chamber
 731 // Arguments: iCh- chamber ID; pMatrix- pointer to precreated unity matrix where to store the results
 732 //   Returns: none
 733   const Double_t kAngHor=19.5;        //  horizontal angle between chambers  19.5 grad
 734   const Double_t kAngVer=20;          //  vertical angle between chambers    20   grad
 735   const Double_t kAngCom=30;          //  common HMPID rotation with respect to x axis  30   grad
 736   const Double_t kTrans[3]={490,0,0}; //  center of the chamber is on window-gap surface
 737   pMatrix->RotateY(90);               //  rotate around y since initial position is in XY plane -> now in YZ plane
 738   pMatrix->SetTranslation(kTrans);    //  now plane in YZ is shifted along x
 739   switch(iCh){
 740     case 0:                pMatrix->RotateY(kAngHor);  pMatrix->RotateZ(-kAngVer);  break; //right and down
 741     case 1:                                            pMatrix->RotateZ(-kAngVer);  break; //down
 742     case 2:                pMatrix->RotateY(kAngHor);                               break; //right
 743     case 3:                                                                         break; //no rotation
 744     case 4:                pMatrix->RotateY(-kAngHor);                              break; //left
 745     case 5:                                            pMatrix->RotateZ(kAngVer);   break; //up
 746     case 6:                pMatrix->RotateY(-kAngHor); pMatrix->RotateZ(kAngVer);   break; //left and up
 747   }
 748   pMatrix->RotateZ(kAngCom);     //apply common rotation  in XY plane
 749 }