842bd21840aca37257dc88df651c5d1645f41f1a
[u/mrichter/AliRoot.git] / RICH / AliRICH.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
16 #include "AliRICH.h"
17 #include "AliRICHParam.h"
18 #include "AliRICHChamber.h"
19 #include "AliRICHClusterFinder.h"
20 #include <TArrayF.h>
21 #include <TGeometry.h>
22 #include <TBRIK.h>
23 #include <TTUBE.h>
24 #include <TFile.h>
25 #include <TNode.h> 
26 #include <TObjArray.h>
27 #include <TParticle.h>
28 #include <AliStack.h>
29 #include <AliMagF.h>
30 #include <AliRun.h>
31 #include <AliRunDigitizer.h>
32 #include <AliMC.h>
33 #include <AliESD.h>
34 #include <TVirtualMC.h>
35 #include <TH1F.h>
36 #include <TH2F.h>
37 #include <TStopwatch.h>
38 #include <AliLog.h>
39  
40 ClassImp(AliRICHhit)
41 //__________________________________________________________________________________________________
42 void AliRICHhit::Print(Option_t*)const
43 {
44   AliInfo(Form("Ch=%1i, TID=%6i, eloss=%9.3f eV, in-out dist=%9.4f, OUT(%7.2f,%7.2f,%7.2f)"
45       ,fChamber,fTrack,fEloss*1e9,Length(),fOutX3.X(),fOutX3.Y(),fOutX3.Z()));
46 }
47 //__________________________________________________________________________________________________
48 ClassImp(AliRICHdigit)
49 //__________________________________________________________________________________________________
50 void AliRICHdigit::Print(Option_t*)const
51 {
52   AliInfo(Form("cfm=%9i, cs=%2i, x=%3i, y=%3i, q=%8.3f, TID1=%5i, TID2=%5i, TID3=%5i",
53                   fCFM,fChamber,fPadX,fPadY,fQdc,fTracks[0],fTracks[1],fTracks[2]));
54 }
55 //__________________________________________________________________________________________________
56 ClassImp(AliRICHcluster)
57 //__________________________________________________________________________________________________
58 void AliRICHcluster::Print(Option_t*)const
59 {
60   char *status=0;
61   switch(fStatus){
62     case      kRaw: status="raw"     ;break;
63     case kResolved: status="resolved";break;
64     case    kEmpty: status="empty"   ;break;
65   }
66   if(fDigits)    
67     ::Info("cluster","cfm=%10i, cs=%2i, SiMa=%6i, Shape=%5i, x=%7.3f, y=%7.3f, Q=%6i, %s with %i digits",
68                              fCFM,fChamber,fSize,fShape,fX,fY,fQdc,status,fDigits->GetEntriesFast());
69   else
70     AliInfo(Form("cfm=%10i, cs=%2i, SiMa=%6i, Shape=%5i, x=%7.3f, y=%7.3f, Q=%6i, %s with %i digits",
71                              fCFM,fChamber,fSize,fShape,fX,fY,fQdc,status,0));
72     
73 }
74 //__________________________________________________________________________________________________
75 ClassImp(AliRICH)    
76 //__________________________________________________________________________________________________
77 // RICH manager class   
78 //BEGIN_HTML
79 /*
80   <img src="gif/alirich.gif">
81 */
82 //END_HTML
83 //__________________________________________________________________________________________________
84 AliRICH::AliRICH():AliDetector(),fpParam(0),  fSdigits(0),fNsdigits(0),fDigitsNew(0),fClusters(0) 
85 {
86 //Default ctor should not contain any new operators
87 //AliDetector ctor deals with Hits and Digits  
88   for(int i=0;i<kNchambers;i++) fNdigitsNew[i]  =0;
89   for(int i=0;i<kNchambers;i++) fNclusters[i]=0;
90 //  fCounters.ResizeTo(20); fCounters.Zero();
91 }//AliRICH::AliRICH()
92 //__________________________________________________________________________________________________
93 AliRICH::AliRICH(const char *name, const char *title)
94         :AliDetector(name,title),fpParam(new AliRICHParam),fSdigits(0),fNsdigits(0),fDigitsNew(0),fClusters(0)
95 {
96 //Named ctor
97   AliDebug(1,"Start.");
98 //AliDetector ctor deals with Hits and Digits (reset them to 0, does not create them)
99   CreateHits();          gAlice->GetMCApp()->AddHitList(fHits);
100   fCounters.ResizeTo(20); fCounters.Zero();
101   AliDebug(1,"Stop.");
102 }//AliRICH::AliRICH(const char *name, const char *title)
103 //__________________________________________________________________________________________________
104 AliRICH::~AliRICH()
105 {
106 //dtor
107   AliDebug(1,"Start.");
108
109   if(fpParam)    delete fpParam;
110   
111   if(fHits)      delete fHits;
112   if(fSdigits)   delete fSdigits;
113   if(fDigits)    delete fDigits;
114   if(fDigitsNew) {fDigitsNew->Delete();   delete fDigitsNew;}
115   if(fClusters)  {fClusters->Delete();    delete fClusters;}
116   AliDebug(1,"Stop.");    
117 }//AliRICH::~AliRICH()
118 //__________________________________________________________________________________________________
119 void AliRICH::Hits2SDigits()
120 {
121 // Create a list of sdigits corresponding to list of hits. Every hit generates one or more sdigits.
122   AliDebug(1,"Start.");
123   for(Int_t iEventN=0;iEventN<GetLoader()->GetRunLoader()->GetAliRun()->GetEventsPerRun();iEventN++){//events loop
124     GetLoader()->GetRunLoader()->GetEvent(iEventN);//get next event
125   
126     if(!GetLoader()->TreeH()) GetLoader()->LoadHits();    GetLoader()->GetRunLoader()->LoadHeader(); 
127                                                           GetLoader()->GetRunLoader()->LoadKinematics();//from
128     if(!GetLoader()->TreeS()) GetLoader()->MakeTree("S"); MakeBranch("S");//to
129           
130     for(Int_t iPrimN=0;iPrimN<GetLoader()->TreeH()->GetEntries();iPrimN++){//prims loop
131       GetLoader()->TreeH()->GetEntry(iPrimN);
132       for(Int_t iHitN=0;iHitN<Hits()->GetEntries();iHitN++){//hits loop 
133         AliRICHhit *pHit=(AliRICHhit*)Hits()->At(iHitN);//get current hit                
134         TVector2 x2 = C(pHit->C())->Mrs2Pc(pHit->OutX3());//hit position in photocathode plane
135         Int_t iTotQdc=P()->TotQdc(x2,pHit->Eloss());//total charge produced by hit, 0 if hit in dead zone
136         if(iTotQdc==0) continue;
137         TVector area=P()->Loc2Area(x2);//determine affected pads, dead zones analysed inside
138         AliDebug(1,Form("hit(%6.2f,%6.2f)->area(%3.0f,%3.0f)-(%3.0f,%3.0f) QDC=%4i",x2.X(),x2.Y(),area[0],area[1],area[2],area[3],iTotQdc));
139         TVector pad(2);
140         for(pad[1]=area[1];pad[1]<=area[3];pad[1]++)//affected pads loop
141           for(pad[0]=area[0];pad[0]<=area[2];pad[0]++){                    
142             Double_t padQdc=iTotQdc*P()->FracQdc(x2,pad);
143             AliDebug(1,Form("current pad(%3.0f,%3.0f) with QDC  =%6.2f",pad[0],pad[1],padQdc));
144             if(padQdc>0.1) AddSDigit(pHit->C(),pad,padQdc,GetLoader()->GetRunLoader()->Stack()->Particle(pHit->GetTrack())->GetPdgCode(),pHit->GetTrack());
145           }//affected pads loop 
146       }//hits loop
147     }//prims loop
148     GetLoader()->TreeS()->Fill();
149     GetLoader()->WriteSDigits("OVERWRITE");
150     ResetSDigits();
151   }//events loop  
152   GetLoader()->UnloadHits(); GetLoader()->GetRunLoader()->UnloadHeader(); GetLoader()->GetRunLoader()->UnloadKinematics();
153   GetLoader()->UnloadSDigits();  
154   AliDebug(1,"Stop.");
155 }//Hits2SDigits()
156 //__________________________________________________________________________________________________
157 void AliRICH::BuildGeometry() 
158 {
159 //Builds a TNode geometry for event display
160   AliInfo("Start.");
161   
162   TNode *node, *subnode, *top;
163   top=gAlice->GetGeometry()->GetNode("alice");
164
165   Float_t widx=P()->SectorSizeX();
166   Float_t leny=P()->SectorSizeY();
167   Float_t dz = P()->Zfreon()+P()->Zwin()+P()->Pc2Win();
168   Float_t dead = P()->DeadZone();
169
170   new TBRIK("RICH","RICH","void",widx+dead/2,leny+leny/2+dead,dz+0.1); //RICH chamber
171   new TBRIK("RPC" ,"RPC" ,"void",widx/2,leny/2,0.01);                  //RICH sector 
172
173   for(int i=1;i<=kNchambers;i++){
174     top->cd();
175     node = new TNode(Form("RICH%i",i),Form("RICH%i",i),"RICH",C(i)->Center().X(),C(i)->Center().Y(),C(i)->Center().Z(),C(i)->RotMatrixName());
176     node->SetLineColor(kRed);
177     node->cd();
178     subnode = new TNode("PHOTO1","PHOTO1","RPC",-widx/2-dead/2,-leny-dead/2,dz,"");
179     subnode->SetLineColor(kGreen);
180     fNodes->Add(subnode);
181     subnode = new TNode("PHOTO1","PHOTO1","RPC", widx/2+dead/2,-leny-dead/2,dz,"");
182     subnode->SetLineColor(kGreen);
183     fNodes->Add(subnode);
184     subnode = new TNode("PHOTO1","PHOTO1","RPC",-widx/2-dead/2,           0,dz,"");
185     subnode->SetLineColor(kGreen);
186     fNodes->Add(subnode);
187     subnode = new TNode("PHOTO1","PHOTO1","RPC", widx/2+dead/2,           0,dz,"");
188     subnode->SetLineColor(kGreen);
189     fNodes->Add(subnode);
190     subnode = new TNode("PHOTO1","PHOTO1","RPC",-widx/2-dead/2, leny+dead/2,dz,"");
191     subnode->SetLineColor(kGreen);
192     fNodes->Add(subnode);
193     subnode = new TNode("PHOTO1","PHOTO1","RPC", widx/2+dead/2, leny+dead/2,dz,"");
194     subnode->SetLineColor(kGreen);
195     fNodes->Add(subnode);
196     fNodes->Add(node);
197   }
198
199   AliDebug(1,"Stop.");    
200 }//void AliRICH::BuildGeometry()
201
202 //______________________________________________________________________________
203 void AliRICH::CreateMaterials()
204 {
205 // Definition of available RICH materials  
206         
207   Int_t   material=0; //tmp material id number
208   Float_t a=0,z=0,den=0,radl=0,absl=0; //tmp material parameters
209   Float_t tmaxfd=-10.0, deemax=-0.2, stemax=-0.1,epsil=0.001, stmin=-0.001; 
210   Int_t   isxfld = gAlice->Field()->Integ();
211   Float_t sxmgmx = gAlice->Field()->Max();
212     
213   Float_t aAir[4]={12.,14.,16.,36.};  Float_t zAir[4]={6.,7.,8.,18.}; Float_t wAir[4]={0.000124,0.755267,0.231781,0.012827};//total 0.9999999
214   AliMixture(++material, "RichAir",aAir,zAir,den=0.00120479,4,wAir);                                          //1 (Air) 0.01% C 75% N  23% O 1% Ar
215   AliMedium(kAir, "RichAir",material, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
216   
217   AliMaterial(++material, "RichRohacell", a=12.01,z=6.0, den=0.1,     radl=18.8,   absl=0);                   //2 Rohacell 51 C-equiv radl rad cover
218   AliMedium(kRoha, "RichRohacell", material, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
219   
220   Float_t  aQuartz[2]={28.09,16.0};  Float_t  zQuartz[2]={14.00, 8.0};  Float_t  wQuartz[2]={1,2};
221   AliMixture(++material, "RichSiO2",aQuartz,zQuartz,den=2.64,-2, wQuartz);                                    //3 Quarz (SiO2) -trasparent rad window
222   AliMedium(kSiO2, "RichSiO2",material, 1, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
223   
224   Float_t  aFreon[2]={12,19};  Float_t  zFreon[2]={6,9};  Float_t wmatFreon[2]={6,14};
225   AliMixture(++material, "RichC6F14",aFreon,zFreon,den=1.68,-2,wmatFreon);                                    //4 Freon (C6F14) 
226   AliMedium(kC6F14, "RichC6F14",material, 1, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
227   
228   Float_t aMethane[2]={12.01,1}; Float_t zMethane[2]={6,1}; Float_t wMethane[2]={1,4};
229   AliMixture (++material, "RichCH4", aMethane, zMethane, den=7.17e-4,-2, wMethane);                        //5,9 methane (CH4) normal and for Gap    
230   AliMedium(kCH4, "RichCH4"   , material, 1, isxfld, sxmgmx, tmaxfd, stemax,  deemax, epsil,  stmin);  
231   AliMixture (++material, "RichCH4", aMethane, zMethane, den=7.17e-4,-2, wMethane);                        //5,9 methane (CH4) normal and for Gap    
232   AliMedium(kGap, "RichCH4gap$", material, 1, isxfld, sxmgmx, tmaxfd, 0.1   , -deemax, epsil, -stmin);
233     
234   AliMaterial(++material, "RichCsI",      a=12.01,z=6.0, den=0.1,     radl=18.8,   absl=0);                   //6 CsI-radl equivalent
235   AliMedium(kCsI, "RichCsI$", material, 1, isxfld, sxmgmx,tmaxfd, stemax, deemax, epsil, stmin);
236   
237   AliMaterial(++material, "GridCu",    a=63.54,z=29.0,den=8.96,    radl=1.43,   absl=0);                   //7 anode grid (Cu) 
238   AliMedium(kGridCu, "GRID$", material, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
239   
240   AliMixture (++material, "OpSiO2",aQuartz, zQuartz, den=2.64, -2, wQuartz);                             //8 Quarz (SiO2) - opaque
241   AliMedium(kOpSiO2, "QUARTZO$",material, 1, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
242   
243   AliMaterial(++material, "ALUM",     a=26.98,z=13.0,den=2.699,     radl=8.9,    absl=0);                 //10 aluminium sheet (Al)
244   AliMedium(kAl, "ALUMINUM$", material, 1, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
245   
246   Float_t aGlass[5]={12.01,28.09,16,10.8,23}; Float_t zGlass[5]={6,14,8,5,11};  Float_t wGlass[5]={0.5,0.105,0.355,0.03,0.01};
247   AliMixture(++material,"GLASS",aGlass, zGlass, den=1.74, 5, wGlass);                                    //11 Glass 50%-C 10.5%-Si 35.5%-O 3%-B 1%-Na
248   AliMedium(kGlass, "GLASS", material, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
249   
250   AliMaterial(++material, "COPPER$",  a=63.54,z=29.0,den=8.96,    radl=1.4,    absl=0);                   //12 Cu
251   AliMedium(kCu, "PCB_COPPER", material, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
252   
253   
254   AliMaterial(++material, "W$",  a=183.84,z=74.0,den=19.3,    radl=0.35,    absl=185.0/den);              //13 W - anod wires
255   AliMedium(kW, "W", material, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
256   
257   
258   if(P()->IsRadioSrc()){
259     AliInfo("Special radioactive source materials");
260     AliMaterial(++material, "STEEL$",  a=63.54,z=29.0,den=8.96,    radl=1.4,    absl=0);                  //14 Steel
261     AliMedium(kSteel, "STEEL", material, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
262   
263     AliMaterial(++material, "PERPEX$",  a=63.54,z=29.0,den=8.96,    radl=1.4,    absl=0);                 //15 Perpex
264     AliMedium(kPerpex, "PERPEX", material, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
265     
266     AliMaterial(++material, "STRONZIUM$",  a=87.62,z=38.0,den=2.54,    radl=4.24,    absl=0);             //16 Sr90
267     AliMedium(kSr90, "STRONZIUM", material, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
268   }
269   
270 //Optical properties:
271 #include "Opticals.h"
272   gMC->SetCerenkov((*fIdtmed)[kAir]      , kNbins, aPckov, aAbsCH4,    aQeAll, aIdxCH4);       //1 Air
273   gMC->SetCerenkov((*fIdtmed)[kRoha]     , kNbins, aPckov, aAbsCH4,    aQeAll, aIdxCH4);       //2 Honeycomb  
274   gMC->SetCerenkov((*fIdtmed)[kSiO2]     , kNbins, aPckov, aAbsSiO2,   aQeAll, aIdxSiO2);      //3 Quartz SiO2 
275   gMC->SetCerenkov((*fIdtmed)[kC6F14]    , kNbins, aPckov, aAbsC6F14,  aQeAll, aIdxC6F14);     //4 Freon C6F14
276   gMC->SetCerenkov((*fIdtmed)[kCH4]      , kNbins, aPckov, aAbsCH4,    aQeAll, aIdxCH4);       //5 Methane CH4 
277   gMC->SetCerenkov((*fIdtmed)[kCsI]      , kNbins, aPckov, aAbsCsI,    aQeCsI, aIdxCH4);       //6 CsI
278   gMC->SetCerenkov((*fIdtmed)[kGridCu]   , kNbins, aPckov, aAbsGrid,   aQeAll, aIdxGrid);      //7 grid Cu
279   gMC->SetCerenkov((*fIdtmed)[kOpSiO2]   , kNbins, aPckov, aAbsOpSiO2, aQeAll, aIdxOpSiO2);    //8 Opaque quartz SiO2
280   gMC->SetCerenkov((*fIdtmed)[kGap]      , kNbins, aPckov, aAbsCH4,    aQeAll, aIdxCH4);       //9 Special methane gap
281   gMC->SetCerenkov((*fIdtmed)[kAl]       , kNbins, aPckov, aAbsGrid,   aQeAll, aIdxGrid);      //10 Aluminium
282   gMC->SetCerenkov((*fIdtmed)[kGlass]    , kNbins, aPckov, aAbsOpSiO2, aQeAll, aIdxOpSiO2);    //11 Glass    
283 }//void AliRICH::CreateMaterials()
284 //__________________________________________________________________________________________________
285 Float_t AliRICH::Fresnel(Float_t ene,Float_t pdoti, Bool_t pola)const
286 {
287
288     //ENE(EV), PDOTI=COS(INC.ANG.), PDOTR=COS(POL.PLANE ROT.ANG.)
289     
290     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,
291                       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,
292                       7.8,7.9,8.0,8.1,8.2,8.3,8.4,8.5};
293     Float_t csin[36] = {2.14,2.21,2.33,2.48,2.76,2.97,2.99,2.59,2.81,3.05,
294                         2.86,2.53,2.55,2.66,2.79,2.96,3.18,3.05,2.84,2.81,2.38,2.11,
295                         2.01,2.13,2.39,2.73,3.08,3.15,2.95,2.73,2.56,2.41,2.12,1.95,
296                         1.72,1.53};
297     Float_t csik[36] = {0.,0.,0.,0.,0.,0.196,0.408,0.208,0.118,0.49,0.784,0.543,
298                         0.424,0.404,0.371,0.514,0.922,1.102,1.139,1.376,1.461,1.253,0.878,
299                         0.69,0.612,0.649,0.824,1.347,1.571,1.678,1.763,1.857,1.824,1.824,
300                         1.714,1.498};
301     Float_t xe=ene;
302     Int_t  j=Int_t(xe*10)-49;
303     Float_t cn=csin[j]+((csin[j+1]-csin[j])/0.1)*(xe-en[j]);
304     Float_t ck=csik[j]+((csik[j+1]-csik[j])/0.1)*(xe-en[j]);
305
306     //FORMULAE FROM HANDBOOK OF OPTICS, 33.23 OR
307     //W.R. HUNTER, J.O.S.A. 54 (1964),15 , J.O.S.A. 55(1965),1197
308
309     Float_t sinin=TMath::Sqrt(1-pdoti*pdoti);
310     Float_t tanin=sinin/pdoti;
311
312     Float_t c1=cn*cn-ck*ck-sinin*sinin;
313     Float_t c2=4*cn*cn*ck*ck;
314     Float_t aO=TMath::Sqrt(0.5*(TMath::Sqrt(c1*c1+c2)+c1));
315     Float_t b2=0.5*(TMath::Sqrt(c1*c1+c2)-c1);
316     
317     Float_t rs=((aO-pdoti)*(aO-pdoti)+b2)/((aO+pdoti)*(aO+pdoti)+b2);
318     Float_t rp=rs*((aO-sinin*tanin)*(aO-sinin*tanin)+b2)/((aO+sinin*tanin)*(aO+sinin*tanin)+b2);
319     
320
321     //CORRECTION FACTOR FOR SURFACE ROUGHNESS
322     //B.J. STAGG  APPLIED OPTICS, 30(1991),4113
323
324     Float_t sigraf=18.;
325     Float_t lamb=1240/ene;
326     Float_t fresn;
327  
328     Float_t  rO=TMath::Exp(-(4*TMath::Pi()*pdoti*sigraf/lamb)*(4*TMath::Pi()*pdoti*sigraf/lamb));
329
330     if(pola)
331     {
332         Float_t pdotr=0.8;                                 //DEGREE OF POLARIZATION : 1->P , -1->S
333         fresn=0.5*(rp*(1+pdotr)+rs*(1-pdotr));
334     }
335     else
336         fresn=0.5*(rp+rs);
337       
338     fresn = fresn*rO;
339     return(fresn);
340 }//Fresnel()
341 //__________________________________________________________________________________________________
342 Float_t AliRICH::AbsoCH4(Float_t x)const
343 {
344 //Evaluate the absorbtion lenght of CH4
345   Float_t sch4[9] = {.12,.16,.23,.38,.86,2.8,7.9,28.,80.};              //MB X 10^22
346   Float_t em[9] = {8.1,8.158,8.212,8.267,8.322,8.378,8.435,8.493,8.55};
347   const Float_t kLoschmidt=2.686763e19;                                      // LOSCHMIDT NUMBER IN CM-3
348   const Float_t kPressure=750.,kTemperature=283.;                                      
349   const Float_t kPn=kPressure/760.;
350   const Float_t kTn=kTemperature/273.16;
351   const Float_t kC0=-1.655279e-1;
352   const Float_t kC1=6.307392e-2;
353   const Float_t kC2=-8.011441e-3;
354   const Float_t kC3=3.392126e-4;
355                 
356   Float_t crossSection=0;                        
357   if (x<7.75) 
358     crossSection=.06e-22;
359   else if(x>=7.75 && x<=8.1){                 //------ METHANE CROSS SECTION cm-2 ASTROPH. J. 214, L47 (1978)                                               
360         crossSection=(kC0+kC1*x+kC2*x*x+kC3*x*x*x)*1.e-18;
361   }else if (x> 8.1){
362     Int_t j=0;
363     while (x<=em[j] || x>=em[j+1]){
364       j++;
365       Float_t a=(sch4[j+1]-sch4[j])/(em[j+1]-em[j]);
366       crossSection=(sch4[j]+a*(x-em[j]))*1e-22;
367     }
368   }//if
369     
370     Float_t density=kLoschmidt*kPn/kTn; //CH4 molecular density 1/cm-3
371     return 1./(density*crossSection);
372 }//AbsoCH4()
373 //__________________________________________________________________________________________________
374 void AliRICH::MakeBranch(Option_t* option)
375 {
376 //Create Tree branches for the RICH.
377   AliDebug(1,Form("Start with option= %s.",option));
378     
379   const Int_t kBufferSize = 4000;
380       
381   const char *cH = strstr(option,"H");
382   const char *cD = strstr(option,"D");
383   const char *cR = strstr(option,"R");
384   const char *cS = strstr(option,"S");
385
386   if(cH&&TreeH()){//H
387     CreateHits();      //branch will be created in AliDetector::MakeBranch
388   }//H     
389   AliDetector::MakeBranch(option);//this is after cH because we need to guarantee that fHits array is created
390       
391   if(cS&&fLoader->TreeS()){//S  
392     CreateSDigits();   MakeBranchInTree(fLoader->TreeS(),"RICH",&fSdigits,kBufferSize,0) ;
393   }//S
394    
395   if(cD&&fLoader->TreeD()){//D
396     CreateDigits();
397     for(Int_t i=0;i<kNchambers;i++){ 
398       MakeBranchInTree(fLoader->TreeD(),Form("%s%d",GetName(),i+1),&((*fDigitsNew)[i]),kBufferSize,0);
399     }
400   }//D
401   
402   if(cR&&fLoader->TreeR()){//R
403     CreateClusters();
404     for(Int_t i=0;i<kNchambers;i++)
405       MakeBranchInTree(fLoader->TreeR(),Form("%sClusters%d",GetName(),i+1), &((*fClusters)[i]), kBufferSize, 0);    
406   }//R
407   AliDebug(1,"Stop.");   
408 }//void AliRICH::MakeBranch(Option_t* option)
409 //__________________________________________________________________________________________________
410 void AliRICH::SetTreeAddress()
411 {
412 //Set branch address for the Hits and Digits Tree.
413   AliDebug(1,"Start.");
414       
415   TBranch *branch;
416     
417   if(fLoader->TreeH()){//H
418     AliDebug(1,"tree H is requested.");
419     CreateHits();//branch map will be in AliDetector::SetTreeAddress    
420   }//H
421   AliDetector::SetTreeAddress();//this is after TreeH because we need to guarantee that fHits array is created
422
423   if(fLoader->TreeS()){//S
424     AliDebug(1,"tree S is requested.");
425     branch=fLoader->TreeS()->GetBranch(GetName());        if(branch){CreateSDigits();   branch->SetAddress(&fSdigits);}
426   }//S
427     
428   if(fLoader->TreeD()){//D    
429     AliDebug(1,"tree D is requested.");
430     for(int i=0;i<kNchambers;i++){      
431       branch=fLoader->TreeD()->GetBranch(Form("%s%d",GetName(),i+1)); 
432       if(branch){CreateDigits(); branch->SetAddress(&((*fDigitsNew)[i]));}
433     }
434   }//D
435     
436   if(fLoader->TreeR()){//R
437     AliDebug(1,"tree R is requested.");
438     for(int i=0;i<kNchambers;i++){         
439       branch=fLoader->TreeR()->GetBranch(Form("%sClusters%d" ,GetName(),i+1));
440       if(branch){CreateClusters(); branch->SetAddress(&((*fClusters)[i]));}
441     }
442   }//R
443   AliDebug(1,"Stop.");
444 }//void AliRICH::SetTreeAddress()
445 //__________________________________________________________________________________________________
446 void AliRICH::Print(Option_t *option)const
447 {
448 //Debug printout
449   TObject::Print(option);
450   P()->Print();
451   fCounters.Print();
452 }//void AliRICH::Print(Option_t *option)const
453 //__________________________________________________________________________________________________
454 void AliRICH::CreateGeometry()
455 {
456 //Creates detailed geometry simulation (currently GEANT volumes tree)         
457   AliDebug(1,"Start main.");
458   Double_t cm=1,mm=0.1*cm,mkm=0.001*cm;
459   Float_t par[3];
460   Int_t id=0;
461        
462 //place chambers into mother volume ALIC
463   par[0]=(6*mm+1681*mm+6*mm)/2;par[1]=(6*mm+1466*mm+6*mm)/2;par[2]=(80*mm+40*mm)*2/2;gMC->Gsvolu("RICH","BOX ",(*fIdtmed)[kCH4],par,3);//2033P1  z p84 TDR
464   if(P()->IsRadioSrc()){
465     AliInfo("Special test beam geometry");
466     gMC->Gspos("RICH",1,"ALIC",0,0,0,0, "ONLY");  //single RICH chamber without rotation test beam geometry
467   }else
468     for(int i=1;i<=kNchambers;i++){ //full RICH with 7 chambers
469       AliMatrix(id,C(i)->ThetaXd(),C(i)->PhiXd(),  C(i)->ThetaYd(),C(i)->PhiYd(),  C(i)->ThetaZd(),C(i)->PhiZd());
470       gMC->Gspos("RICH",i,"ALIC",C(i)->Center().X(),C(i)->Center().Y(),C(i)->Center().Z(),id, "ONLY");
471     }
472 //Pad Panel frame  6 sectors
473   par[0]=648*mm/2;par[1]=  411*mm/2;par[2]=40  *mm/2;gMC->Gsvolu("RPPF","BOX ",(*fIdtmed)[kAl]  ,par,3);//PPF 2001P2 inner size of the slab by 1mm more
474   par[0]=181*mm/2;par[1]=89.25*mm/2;par[2]=38.3*mm/2;gMC->Gsvolu("PPFL","BOX ",(*fIdtmed)[kAir] ,par,3);//large whole
475   par[0]=114*mm/2;par[1]=89.25*mm/2;par[2]=38.3*mm/2;gMC->Gsvolu("PPFS","BOX ",(*fIdtmed)[kAir] ,par,3);//small whole
476   par[0]=644*mm/2;par[1]=  407*mm/2;par[2]= 1.7*mm/2;gMC->Gsvolu("RPC ","BOX ",(*fIdtmed)[kCsI] ,par,3);//by 0.2 mm more then actual size (PCB 2006P1)
477   
478   gMC->Gspos("RPPF",1,"RICH",    -335*mm,      -433*mm,  8*cm+20*mm,  0,"ONLY");//F1 2040P1 z p.84 TDR
479   gMC->Gspos("RPPF",2,"RICH",    +335*mm,      -433*mm,  8*cm+20*mm,  0,"ONLY");
480   gMC->Gspos("RPPF",3,"RICH",    -335*mm,         0*mm,  8*cm+20*mm,  0,"ONLY");
481   gMC->Gspos("RPPF",4,"RICH",    +335*mm,         0*mm,  8*cm+20*mm,  0,"ONLY");
482   gMC->Gspos("RPPF",5,"RICH",    -335*mm,      +433*mm,  8*cm+20*mm,  0,"ONLY");
483   gMC->Gspos("RPPF",6,"RICH",    +335*mm,      +433*mm,  8*cm+20*mm,  0,"ONLY");  
484   gMC->Gspos("RPC ",1,"RPPF",       0*mm,         0*mm,   -19.15*mm,  0,"ONLY");//PPF 2001P2 
485   gMC->Gspos("PPFL",1,"RPPF",  -224.5*mm,  -151.875*mm,     0.85*mm,  0,"ONLY");
486   gMC->Gspos("PPFL",2,"RPPF",  -224.5*mm,  - 50.625*mm,     0.85*mm,  0,"ONLY");
487   gMC->Gspos("PPFL",3,"RPPF",  -224.5*mm,  + 50.625*mm,     0.85*mm,  0,"ONLY");
488   gMC->Gspos("PPFL",4,"RPPF",  -224.5*mm,  +151.875*mm,     0.85*mm,  0,"ONLY");
489   gMC->Gspos("PPFS",1,"RPPF",  - 65.0*mm,  -151.875*mm,     0.85*mm,  0,"ONLY");
490   gMC->Gspos("PPFS",2,"RPPF",  - 65.0*mm,  - 50.625*mm,     0.85*mm,  0,"ONLY");
491   gMC->Gspos("PPFS",3,"RPPF",  - 65.0*mm,  + 50.625*mm,     0.85*mm,  0,"ONLY");
492   gMC->Gspos("PPFS",4,"RPPF",  - 65.0*mm,  +151.875*mm,     0.85*mm,  0,"ONLY");
493   gMC->Gspos("PPFS",5,"RPPF",  + 65.0*mm,  -151.875*mm,     0.85*mm,  0,"ONLY");
494   gMC->Gspos("PPFS",6,"RPPF",  + 65.0*mm,  - 50.625*mm,     0.85*mm,  0,"ONLY");
495   gMC->Gspos("PPFS",7,"RPPF",  + 65.0*mm,  + 50.625*mm,     0.85*mm,  0,"ONLY");
496   gMC->Gspos("PPFS",8,"RPPF",  + 65.0*mm,  +151.875*mm,     0.85*mm,  0,"ONLY"); 
497   gMC->Gspos("PPFL",5,"RPPF",  +224.5*mm,  -151.875*mm,     0.85*mm,  0,"ONLY");
498   gMC->Gspos("PPFL",6,"RPPF",  +224.5*mm,  - 50.625*mm,     0.85*mm,  0,"ONLY");
499   gMC->Gspos("PPFL",7,"RPPF",  +224.5*mm,  + 50.625*mm,     0.85*mm,  0,"ONLY");
500   gMC->Gspos("PPFL",8,"RPPF",  +224.5*mm,  +151.875*mm,     0.85*mm,  0,"ONLY");
501 //Gap - anod wires 6 copies to RICH
502   par[0]=648*mm/2;par[1]=  411*mm/2 ;par[2]=4.45*mm/2;gMC->Gsvolu("RGAP ","BOX ",(*fIdtmed)[kCH4] ,par,3);//xy as PPF 2001P2 z WP 2099P1
503   par[0]=  0*mm  ;par[1]=  20*mkm/2 ;par[2]= 648*mm/2;gMC->Gsvolu("RANO","TUBE",(*fIdtmed)[kW]   ,par,3);//WP 2099P1 z = gap x PPF 2001P2
504   AliMatrix(id,180,0, 90,90, 90,0); //wires along x
505   
506   gMC->Gspos("RGAP",1,"RICH",    -335*mm,      -433*mm,8*cm-2.225*mm, 0,"ONLY"); //F1 2040P1 z WP 2099P1
507   gMC->Gspos("RGAP",2,"RICH",    +335*mm,      -433*mm,8*cm-2.225*mm, 0,"ONLY"); 
508   gMC->Gspos("RGAP",3,"RICH",    -335*mm,         0*mm,8*cm-2.225*mm, 0,"ONLY"); 
509   gMC->Gspos("RGAP",4,"RICH",    +335*mm,         0*mm,8*cm-2.225*mm, 0,"ONLY"); 
510   gMC->Gspos("RGAP",5,"RICH",    -335*mm,      +433*mm,8*cm-2.225*mm, 0,"ONLY"); 
511   gMC->Gspos("RGAP",6,"RICH",    +335*mm,      +433*mm,8*cm-2.225*mm, 0,"ONLY"); 
512   for(int i=1;i<=96;i++)
513     gMC->Gspos("RANO",i,"RGAP",     0*mm, -411/2*mm+i*4*mm, 0.185*mm, id,"ONLY"); //WP 2099P1  
514 //Radiator 3 modules
515   par[0]=1330*mm/2 ;par[1]= 413*mm/2  ;par[2]=  24*mm/2;  gMC->Gsvolu("RRAD","BOX ",(*fIdtmed)[kC6F14]     ,par,3); // Rad 2011P1
516   par[0]=1330*mm/2 ;par[1]= 413*mm/2  ;par[2]=   4*mm/2;  gMC->Gsvolu("RRFR","BOX ",(*fIdtmed)[kRoha]      ,par,3); //front 
517   par[0]=1330*mm/2 ;par[1]= 413*mm/2  ;par[2]=   5*mm/2;  gMC->Gsvolu("RRWI","BOX ",(*fIdtmed)[kSiO2]      ,par,3); //window
518   par[0]=1330*mm/2 ;par[1]=   5*mm/2  ;par[2]=  15*mm/2;  gMC->Gsvolu("RRLO","BOX ",(*fIdtmed)[kRoha]      ,par,3); //long side  
519   par[0]=  10*mm/2 ;par[1]= 403*mm/2  ;par[2]=  15*mm/2;  gMC->Gsvolu("RRSH","BOX ",(*fIdtmed)[kRoha]      ,par,3); //short side 
520   par[0]=   0      ;par[1]=  10*mm/2  ;par[2]=  15*mm/2;  gMC->Gsvolu("RRSP","TUBE",(*fIdtmed)[kSiO2]      ,par,3); //spacer        
521     
522   gMC->Gspos("RRAD",1,"RICH",   0*mm,-434*mm,   -12*mm,  0,"ONLY"); //radiator to RICH
523   gMC->Gspos("RRAD",2,"RICH",   0*mm,   0*mm,   -12*mm,  0,"ONLY"); 
524   gMC->Gspos("RRAD",3,"RICH",   0*mm,+434*mm,   -12*mm,  0,"ONLY"); 
525     gMC->Gspos("RRFR",1,"RRAD",   0*mm,   0*mm, -10.0*mm,  0,"ONLY"); //front cover 
526     gMC->Gspos("RRWI",1,"RRAD",   0*mm,   0*mm,   9.5*mm,  0,"ONLY"); //quartz window (back cover)
527     gMC->Gspos("RRLO",1,"RRAD",   0*mm,-204*mm,  -0.5*mm,  0,"ONLY"); //long side
528     gMC->Gspos("RRLO",2,"RRAD",   0*mm,+204*mm,  -0.5*mm,  0,"ONLY"); //long side
529     gMC->Gspos("RRSH",1,"RRAD",-660*mm,   0*mm,  -0.5*mm,  0,"ONLY"); //short side
530     gMC->Gspos("RRSH",2,"RRAD",+660*mm,   0*mm,  -0.5*mm,  0,"ONLY"); //short side 
531     for(int i=0;i<3;i++)
532       for(int j=0;j<10;j++)
533         gMC->Gspos("RRSP",10*i+j,"RRAD",-1330*mm/2+116*mm+j*122*mm,(i-1)*105*mm,-0.5*mm,0,"ONLY");
534
535 //Sandbox  
536   par[0]=1419*mm/2 ;par[1]=1378*mm/2;par[2]=50.5*mm/2; gMC->Gsvolu("RSNB","BOX ",(*fIdtmed)[kAir]  ,par,3);  //2072P1   
537   par[0]=1419*mm/2 ;par[1]=1378*mm/2;par[2]= 0.5*mm/2; gMC->Gsvolu("RSCO","BOX ",(*fIdtmed)[kAl]   ,par,3);  //cover
538   par[0]=1359*mm/2 ;par[1]=1318*mm/2;par[2]=49.5*mm/2; gMC->Gsvolu("RSHO","BOX ",(*fIdtmed)[kRoha] ,par,3); //honeycomb structure 
539   
540   gMC->Gspos("RSNB",1,"RICH",   0*mm, 0*mm, -73.75*mm, 0,"ONLY"); //p.84 TDR sandbox to rich
541     gMC->Gspos("RSHO",1,"RSNB", 0*mm, 0*mm,      0*mm, 0,"ONLY"); //2072P1 honeycomv to sandbox
542     gMC->Gspos("RSCO",1,"RSNB", 0*mm, 0*mm,    +25*mm, 0,"ONLY"); //cover to sandbox
543     gMC->Gspos("RSCO",2,"RSNB", 0*mm, 0*mm,    -25*mm, 0,"ONLY"); //cover to sandbox
544              
545   AliDebug(1,"Stop main.");  
546 }//void AliRICH::CreateGeometry()
547 //__________________________________________________________________________________________________
548 void AliRICH::ControlPlots()
549
550 // Creates a set of hists to control the results of simulation. Hists are in file $HOME/RCP.root
551      
552   TH1F *pHxD=0,*pHyD=0,*pNumClusH1=0,
553                    *pQdcH1=0,       *pSizeH1=0,
554                    *pPureMipQdcH1=0,*pPureMipSizeH1=0,
555                    *pPureCerQdcH1=0,*pPureCerSizeH1=0,
556                    *pPureFeeQdcH1=0,*pPureFeeSizeH1=0,
557                    *pMipQdcH1=0,    *pPhotQdcH1=0;  
558   TH2F *pMapH2=0,*pPureMipMapH2=0,*pPureCerMapH2=0,*pPureFeeMapH2=0;
559   
560   Bool_t isDig =!GetLoader()->LoadDigits();
561   Bool_t isClus=!GetLoader()->LoadRecPoints();
562
563   if(!isDig && !isClus){AliError("No digits and clusters! Nothing to do.");return;}
564   
565   TStopwatch sw;TDatime time;
566     
567   TFile *pFile = new TFile("$(HOME)/RCP.root","RECREATE");   
568   
569   if(isDig){
570     AliInfo("Digits available");
571     pHxD=new TH1F("HitDigitDiffX","Hit-Digits diff X all chambers;diff [cm]",100,-10,10); 
572     pHyD=new TH1F("HitDigitDiffY","Hit-Digits diff Y all chambers;diff [cm]",100,-10,10); 
573   }//isDig
574   
575   if(isClus){ 
576     cout<<"Clusters available\n";
577     pNumClusH1=new TH1F("NumClusPerEvent","Number of clusters per event;number",50,0,49);
578     
579     pQdcH1        =new TH1F("ClusQdc",   "Cluster Charge all chambers;q [QDC]",R()->P()->MaxQdc(),0,R()->P()->MaxQdc());
580     pSizeH1       =new TH1F("ClusSize",  "Cluster size all chambers;size [number of pads in cluster]",100,0,100);
581     pMapH2        =new TH2F("ClusMap",   "Cluster map;x [cm];y [cm]",1000,0,R()->P()->PcSizeX(),1000,0,R()->P()->PcSizeY());
582   
583     pMipQdcH1     =new TH1F("QdcMip"      ,"MIP Cluster Charge all chambers;q [QDC]",R()->P()->MaxQdc(),0,R()->P()->MaxQdc());
584     pPhotQdcH1    =new TH1F("QdcPhot"     ,"Cer+Fee Cluster Charge all chambers;q [QDC]",R()->P()->MaxQdc(),0,R()->P()->MaxQdc());
585         
586     pPureMipQdcH1 =new TH1F("QdcPureMip"  ,"MIP only Cluster Charge all chambers;q [QDC]",R()->P()->MaxQdc(),0,R()->P()->MaxQdc());
587     pPureMipSizeH1=new TH1F("SizePureMip" ,"MIP only Cluster size all chambers;size [number of pads in cluster]",100,0,100);
588     pPureMipMapH2 =new TH2F("MapPureMip"  ,"MIP only Cluster map;x [cm];y [cm]",1000,0,R()->P()->PcSizeX(),1000,0,R()->P()->PcSizeY());
589   
590     pPureCerQdcH1 =new TH1F("QdcPureCer"  ,"Cerenkov only Cluster Charge all chambers;q [QDC]",R()->P()->MaxQdc(),0,R()->P()->MaxQdc());
591     pPureCerSizeH1=new TH1F("SizePureCer" ,"Cernekov only Cluster size all chambers;size [number of pads in cluster]",100,0,100);
592     pPureCerMapH2 =new TH2F("MapPureCer"  ,"Cerenkov only Cluster map;x [cm];y [cm]",1000,0,R()->P()->PcSizeX(),1000,0,R()->P()->PcSizeY());
593     
594     pPureFeeQdcH1 =new TH1F("QdcPureFee"  ,"Feedback only Cluster Charge all chambers;q [QDC]",R()->P()->MaxQdc(),0,R()->P()->MaxQdc());
595     pPureFeeSizeH1=new TH1F("SizePureFee" ,"Feedback only Cluster size all chambers;size [number of pads in cluster]",100,0,100);
596     pPureFeeMapH2 =new TH2F("MapPureFee"  ,"Feedback only Cluster map;x [cm];y [cm]",1000,0,R()->P()->PcSizeX(),1000,0,R()->P()->PcSizeY());
597   }//isClus
598   
599   for(Int_t iEvtN=0;iEvtN < GetLoader()->GetRunLoader()->GetAliRun()->GetEventsPerRun();iEvtN++){//events loop
600     GetLoader()->GetRunLoader()->GetEvent(iEvtN);    //gets current event
601     
602     if(!GetLoader()->TreeH()) GetLoader()->LoadHits();
603     for(Int_t iPrimN=0;iPrimN < GetLoader()->TreeH()->GetEntries();iPrimN++){//prims loop
604        GetLoader()->TreeH()->GetEntry(iPrimN);      
605     }
606     
607     if(isClus) GetLoader()->TreeR()->GetEntry(0);
608     if(isDig)  GetLoader()->TreeD()->GetEntry(0);  
609     
610     for(Int_t iChamN=1;iChamN<=7;iChamN++){//chambers loop
611       if(isClus){
612         Int_t iNclusCham=Clusters(iChamN)->GetEntries(); if(iNclusCham) pNumClusH1->Fill(iNclusCham);//number of clusters per event
613         for(Int_t iClusN=0;iClusN<iNclusCham;iClusN++){//clusters loop
614           AliRICHcluster *pClus=(AliRICHcluster*)Clusters(iChamN)->At(iClusN);
615                                        pQdcH1        ->Fill(pClus->Q());   
616                                        pSizeH1       ->Fill(pClus->Size());  
617                                        pMapH2        ->Fill(pClus->X(),pClus->Y()); //common
618                                        
619            if(pClus->IsSingleMip())     {pPureMipQdcH1 ->Fill(pClus->Q());
620                                        pPureMipSizeH1->Fill(pClus->Size());
621                                        pPureMipMapH2 ->Fill(pClus->X(),pClus->Y());}//Pure Mips
622                                        
623            if(pClus->IsSingleCerenkov()){pPureCerQdcH1 ->Fill(pClus->Q());
624                                        pPureCerSizeH1->Fill(pClus->Size());
625                                        pPureCerMapH2 ->Fill(pClus->X(),pClus->Y());}//Pure Cerenkovs
626                                        
627            if(pClus->IsSingleFeedback()){pPureFeeQdcH1 ->Fill(pClus->Q());
628                                        pPureFeeSizeH1->Fill(pClus->Size());
629                                        pPureFeeMapH2 ->Fill(pClus->X(),pClus->Y());}//Pure Feedbacks
630            
631            if(pClus->IsMip()) {pMipQdcH1 ->Fill(pClus->Q());} //MIP+ other contributions
632            if(!pClus->IsPureMip())     pPhotQdcH1->Fill(pClus->Q());  //not MIP
633         }//clusters loop
634       }//isClus
635       if(isDig){
636         for(Int_t iDigN=0;iDigN<R()->Digits(iChamN)->GetEntries();iDigN++){//digits loop
637           AliRICHdigit *pDig=(AliRICHdigit*)R()->Digits(iChamN)->At(iDigN);
638           AliRICHhit   *pHit=Hit(pDig->GetTrack(0));//get first hit of this digit
639           TVector2 hitV2=R()->C(iChamN)->Mrs2Pc(pHit->OutX3()); TVector2 digV2=R()->P()->Pad2Loc(pDig->Pad());//center of pad for digit
640           pHxD->Fill(hitV2.X()-digV2.X()); pHyD->Fill(hitV2.Y()-digV2.Y());
641         }//digits loop
642       }//isDig
643     }//chambers loop
644     Info("ControlPlots","Event %i processed.",iEvtN);
645   }//events loop 
646   
647   if(isDig)  GetLoader()->UnloadDigits();
648   if(isClus) GetLoader()->UnloadRecPoints();
649   
650   pFile->Write(); delete pFile;
651   sw.Print();time.Print();
652 }//ControlPlots()
653 //__________________________________________________________________________________________________
654 AliRICHhit* AliRICH::Hit(Int_t tid)
655 {
656 //defines which hit provided by given tid for the currently loaded event
657   R()->GetLoader()->LoadHits();
658   for(Int_t iPrimN=0;iPrimN<R()->GetLoader()->TreeH()->GetEntries();iPrimN++){//prims loop      
659     R()->GetLoader()->TreeH()->GetEntry(iPrimN);
660     for(Int_t iHitN=0;iHitN<R()->Hits()->GetEntries();iHitN++){
661       AliRICHhit *pHit=(AliRICHhit*)R()->Hits()->At(iHitN);
662       if(tid==pHit->Track()) {R()->GetLoader()->UnloadHits();return pHit;}
663     }//hits
664   }//prims loop
665   R()->GetLoader()->UnloadHits();
666   return 0;
667 }
668 //__________________________________________________________________________________________________
669 void AliRICH::PrintHits(Int_t iEvtN)
670 {
671 //Prints a list of RICH hits for a given event. Default is event number 0.
672   AliInfo(Form("List of RICH hits for event %i",iEvtN));
673   R()->GetLoader()->GetRunLoader()->GetEvent(iEvtN);    
674   if(R()->GetLoader()->LoadHits()) return;
675   
676   Int_t iTotalHits=0;
677   for(Int_t iPrimN=0;iPrimN<R()->GetLoader()->TreeH()->GetEntries();iPrimN++){//prims loop
678     R()->GetLoader()->TreeH()->GetEntry(iPrimN);      
679     R()->Hits()->Print();
680     iTotalHits+=R()->Hits()->GetEntries();
681   }
682   R()->GetLoader()->UnloadHits();
683   AliInfo(Form("totally %i hits",iTotalHits));
684 }
685 //__________________________________________________________________________________________________
686 void AliRICH::PrintSDigits(Int_t iEvtN)
687 {
688 //prints a list of RICH sdigits  for a given event
689   Info("PrintSDigits","List of RICH sdigits for event %i",iEvtN);
690   R()->GetLoader()->GetRunLoader()->GetEvent(iEvtN);    
691   if(R()->GetLoader()->LoadSDigits()) return;
692   
693   R()->GetLoader()->TreeS()->GetEntry(0);
694   R()->SDigits()->Print();
695   R()->GetLoader()->UnloadSDigits();
696   Info("PrintSDigits","totally %i sdigits",R()->SDigits()->GetEntries());
697 }
698 //__________________________________________________________________________________________________
699 void AliRICH::PrintDigits(Int_t iEvtN)
700 {
701 //prints a list of RICH digits  for a given event
702   Info("PrintDigits","List of RICH digits for event %i",iEvtN);
703   R()->GetLoader()->GetRunLoader()->GetEvent(iEvtN);    
704   if(R()->GetLoader()->LoadDigits()) return;
705   
706   Int_t iTotalDigits=0;
707   R()->GetLoader()->TreeD()->GetEntry(0);
708   for(Int_t iChamber=1;iChamber<=kNchambers;iChamber++){
709     R()->Digits(iChamber)->Print();
710     iTotalDigits+=R()->Digits(iChamber)->GetEntries();
711   }
712   R()->GetLoader()->UnloadDigits();
713   Info("PrintDigits","totally %i Digits",iTotalDigits);
714 }
715 //__________________________________________________________________________________________________
716 void AliRICH::PrintClusters(Int_t iEvtN)
717 {
718 //prints a list of RICH clusters  for a given event
719   Info("PrintClusters","List of RICH clusters for event %i",iEvtN);
720   R()->GetLoader()->GetRunLoader()->GetEvent(iEvtN);    
721   if(R()->GetLoader()->LoadRecPoints()) return;
722   
723   Int_t iTotalClusters=0;
724   R()->GetLoader()->TreeR()->GetEntry(0);
725   for(Int_t iChamber=1;iChamber<=kNchambers;iChamber++){
726     R()->Clusters(iChamber)->Print();
727     iTotalClusters+=R()->Clusters(iChamber)->GetEntries();
728   }
729   R()->GetLoader()->UnloadRecPoints();
730   Info("PrintClusters","totally %i clusters",iTotalClusters);
731 }
732 //__________________________________________________________________________________________________
733 void AliRICH::PrintTracks(Int_t iEvtN)
734 {
735 //prints a list of tracks (including secondaru) for a given event
736   Info("PrintTracks","List of all tracks for event %i",iEvtN);
737   R()->GetLoader()->GetRunLoader()->GetEvent(iEvtN);    
738   if(R()->GetLoader()->GetRunLoader()->LoadHeader()) return;
739   if(R()->GetLoader()->GetRunLoader()->LoadKinematics()) return;
740   Int_t iTracksCounter=0;
741   Info("PrintTracks","totally %i tracks",iTracksCounter);
742 }