some minor changes to adpat for the situation when no digits or clusters avalbale
[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 <TArrayF.h>
20 #include <TGeometry.h>
21 #include <TBRIK.h>
22 #include <TTUBE.h>
23 #include <TFile.h>
24 #include <TNode.h> 
25 #include <TObjArray.h>
26 #include <TParticle.h>
27 #include <AliStack.h>
28 #include <AliMagF.h>
29 #include <AliRun.h>
30 #include <AliRunDigitizer.h>
31 #include <AliMC.h>
32 #include <TVirtualMC.h>
33  
34 ClassImp(AliRICHhit)
35 //__________________________________________________________________________________________________
36 void AliRICHhit::Print(Option_t*)const
37 {
38   ::Info("hit","Ch=%1i, TID=%6i, eloss=%9.3f eV, in-out dist=%9.4f, OUT(%7.2f,%7.2f,%7.2f)"
39       ,fChamber,fTrack,fEloss*1e9,Length(),fOutX3.X(),fOutX3.Y(),fOutX3.Z());
40 }
41 //__________________________________________________________________________________________________
42 ClassImp(AliRICHdigit)
43 //__________________________________________________________________________________________________
44 void AliRICHdigit::Print(Option_t*)const
45 {
46   ::Info("digit","csxy=%6i, cfm=%9i, c=%2i, x=%3i, y=%3i, q=%8.3f, TID1=%5i, TID2=%5i, TID3=%5i",
47                   Id(),fChFbMip,fChamber,fPadX,fPadY,fQdc,fTracks[0],fTracks[1],fTracks[2]);
48 }
49 //__________________________________________________________________________________________________
50 ClassImp(AliRICHcluster)
51 //__________________________________________________________________________________________________
52 void AliRICHcluster::Print(Option_t*)const
53 {
54   ::Info("cluster","CombiPid=%10i, c=%2i, size=%6i, dim=%5i, x=%7.3f, y=%7.3f, Q=%6i, st=%i",
55            fCombiPid,fChamber,fSize,fDimXY,fX,fY,fQdc,fStatus);
56 }
57 //__________________________________________________________________________________________________
58 ClassImp(AliRICHreco)
59 //__________________________________________________________________________________________________
60 void AliRICHreco::Print(Option_t*)const
61 {
62   ::Info("reco","ThetaCherenkov=%9.6f, Nphotons=%4i, TID=%9i",fThetaCherenkov,fNphotons,fTid);
63 }
64 //__________________________________________________________________________________________________
65 ClassImp(AliRICH)    
66 //__________________________________________________________________________________________________
67 // RICH manager class   
68 //BEGIN_HTML
69 /*
70   <img src="gif/alirich.gif">
71 */
72 //END_HTML
73 //__________________________________________________________________________________________________
74 AliRICH::AliRICH()
75         :AliDetector() 
76 {
77 //Default ctor should not contain any new operators
78   fpParam     =0;
79   fChambers   =0;   
80 //AliDetector ctor deals with Hits and Digits  
81   fSdigits    =0; fNsdigits   =0;
82   fDigitsNew  =0; for(int i=0;i<kNCH;i++) fNdigitsNew[i]  =0;
83   fClusters   =0; for(int i=0;i<kNCH;i++) fNclusters[i]=0;
84   fRecos      =0; fNrecos     =0;
85 }//AliRICH::AliRICH()
86 //__________________________________________________________________________________________________
87 AliRICH::AliRICH(const char *name, const char *title)
88         :AliDetector(name,title)
89 {
90 //Named ctor
91   if(GetDebug())Info("named ctor","Start.");
92   fpParam     =   new AliRICHParam;
93   fChambers = 0;  CreateChambers();
94 //AliDetector ctor deals with Hits and Digits (reset them to 0, does not create them)
95   fHits=       0;     CreateHits();          gAlice->GetMCApp()->AddHitList(fHits);
96   fSdigits=    0;
97   fDigitsNew=  0;
98   fClusters=   0;
99   fRecos      =0;
100   if(GetDebug())Info("named ctor","Stop.");
101 }//AliRICH::AliRICH(const char *name, const char *title)
102 //__________________________________________________________________________________________________
103 AliRICH::~AliRICH()
104 {
105 //dtor
106   if(GetDebug()) Info("dtor","Start.");
107
108   if(fpParam)    delete fpParam;
109   if(fChambers)  delete fChambers;
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   if(fRecos)     delete fRecos;
117   if(GetDebug()) Info("dtor","Stop.");    
118 }//AliRICH::~AliRICH()
119 //__________________________________________________________________________________________________
120 void AliRICH::Hits2SDigits()
121 {
122 // Create a list of sdigits corresponding to list of hits. Every hit generates one or more sdigits.
123 //   
124   if(GetDebug()) Info("Hit2SDigits","Start.");
125   for(Int_t iEventN=0;iEventN<GetLoader()->GetRunLoader()->GetAliRun()->GetEventsPerRun();iEventN++){//events loop
126     GetLoader()->GetRunLoader()->GetEvent(iEventN);
127   
128     if(!GetLoader()->TreeH()) GetLoader()->LoadHits();    GetLoader()->GetRunLoader()->LoadHeader(); 
129                                                           GetLoader()->GetRunLoader()->LoadKinematics();//from
130     if(!GetLoader()->TreeS()) GetLoader()->MakeTree("S"); MakeBranch("S");//to
131           
132     for(Int_t iPrimN=0;iPrimN<GetLoader()->TreeH()->GetEntries();iPrimN++){//prims loop
133       GetLoader()->TreeH()->GetEntry(iPrimN);
134       for(Int_t iHitN=0;iHitN<Hits()->GetEntries();iHitN++){//hits loop 
135         AliRICHhit *pHit=(AliRICHhit*)Hits()->At(iHitN);                
136         TVector2 x2 = P()->ShiftToWirePos(C(pHit->C())->Glob2Loc(pHit->OutX3()));                
137         Int_t iTotQdc=P()->TotQdc(x2,pHit->Eloss());
138         if(iTotQdc==0) continue;
139         Int_t iPadXmin,iPadXmax,iPadYmin,iPadYmax;
140         P()->Loc2Area(x2,iPadXmin,iPadYmin,iPadXmax,iPadYmax);//determine affected pads
141         if(GetDebug()) Info("Hits2SDigits","left-down=(%i,%i) right-up=(%i,%i)",iPadXmin,iPadYmin,iPadXmax,iPadYmax);
142         for(Int_t iPadY=iPadYmin;iPadY<=iPadYmax;iPadY++)//affected pads loop
143           for(Int_t iPadX=iPadXmin;iPadX<=iPadXmax;iPadX++){
144             Double_t padQdc=iTotQdc*P()->FracQdc(x2,iPadX,iPadY);
145             if(padQdc>0.1) AddSDigit(pHit->C(),iPadX,iPadY,padQdc,
146               GetLoader()->GetRunLoader()->Stack()->Particle(pHit->GetTrack())->GetPdgCode(),pHit->GetTrack());
147           }//affected pads loop 
148       }//hits loop
149     }//prims loop
150     GetLoader()->TreeS()->Fill();
151     GetLoader()->WriteSDigits("OVERWRITE");
152     ResetSDigits();
153   }//events loop  
154   GetLoader()->UnloadHits(); GetLoader()->GetRunLoader()->UnloadHeader(); GetLoader()->GetRunLoader()->UnloadKinematics();
155   GetLoader()->UnloadSDigits();  
156   if(GetDebug()) Info("Hit2SDigits","Stop.");
157 }//Hits2SDigits()
158 //__________________________________________________________________________________________________
159 void AliRICH::BuildGeometry() 
160 {
161 //Builds a TNode geometry for event display
162   if(GetDebug())Info("BuildGeometry","Start.");
163   
164   TNode *node, *subnode, *top;
165   top=gAlice->GetGeometry()->GetNode("alice");
166   
167   new TBRIK("S_RICH","S_RICH","void",71.09999,11.5,73.15);
168
169   Float_t wid=P()->SectorSizeX();
170   Float_t len=P()->SectorSizeY();
171   new TBRIK("PHOTO","PHOTO","void",wid/2,0.1,len/2);
172   
173   for(int i=1;i<=kNCH;i++){
174     top->cd();
175     node = new TNode(Form("RICH%i",i),Form("RICH%i",i),"S_RICH",C(i)->X(),C(i)->Y(),C(i)->Z(),C(i)->RotMatrixName());
176     node->SetLineColor(kRed);
177     node->cd();
178     subnode = new TNode("PHOTO1","PHOTO1","PHOTO",wid+P()->DeadZone(),5,len/2+P()->DeadZone()/2,"");
179     subnode->SetLineColor(kGreen);
180     fNodes->Add(subnode);
181     subnode = new TNode("PHOTO1","PHOTO1","PHOTO",0,5,len/2+P()->DeadZone()/2,"");
182     subnode->SetLineColor(kGreen);
183     fNodes->Add(subnode);
184     subnode = new TNode("PHOTO1","PHOTO1","PHOTO",-wid-P()->DeadZone(),5,len/2+P()->DeadZone()/2,"");
185     subnode->SetLineColor(kGreen);
186     fNodes->Add(subnode);
187     subnode = new TNode("PHOTO1","PHOTO1","PHOTO",wid+P()->DeadZone(),5,-len/2-P()->DeadZone()/2,"");
188     subnode->SetLineColor(kGreen);
189     fNodes->Add(subnode);
190     subnode = new TNode("PHOTO1","PHOTO1","PHOTO",0,5,-len/2 -P()->DeadZone()/2,"");
191     subnode->SetLineColor(kGreen);
192     fNodes->Add(subnode);
193     subnode = new TNode("PHOTO1","PHOTO1","PHOTO",-wid-P()->DeadZone(),5,-len/2 - P()->DeadZone()/2,"");
194     subnode->SetLineColor(kGreen);
195     fNodes->Add(subnode);
196     fNodes->Add(node);
197   }  
198   if(GetDebug())Info("BuildGeometry","Stop.");    
199 }//void AliRICH::BuildGeometry()
200
201 //______________________________________________________________________________
202 void AliRICH::CreateMaterials()
203 {
204     //
205     // *** DEFINITION OF AVAILABLE RICH MATERIALS *** 
206   
207 #include "Opticals.h"
208         
209   Float_t a=0,z=0,den=0,radl=0,absl=0;
210   Float_t tmaxfd=-10.0, deemax=-0.2, stemax=-0.1,epsil=0.001, stmin=-0.001; 
211   Int_t   isxfld = gAlice->Field()->Integ();
212   Float_t sxmgmx = gAlice->Field()->Max();
213     
214   AliMaterial( 1, "Air     $",a=14.61,z=7.3, den=0.001205,radl=30420.0,absl=67500);//(Air)
215   AliMedium(1, "DEFAULT MEDIUM AIR$", 1, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
216   
217   AliMaterial( 6, "HON",      a=12.01,z=6.0, den=0.1,     radl=18.8,   absl=0);    //(C)-equivalent radl
218   AliMedium(2, "HONEYCOMB$", 6, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
219   
220   AliMaterial(16, "CSI",      a=12.01,z=6.0, den=0.1,     radl=18.8,   absl=0);    //CsI-radl equivalent
221   AliMedium(kCSI, "CSI$", 16, 1, isxfld, sxmgmx,tmaxfd, stemax, deemax, epsil, stmin);
222   
223   AliMaterial(11, "GRI",      a=63.54,z=29.0,den=8.96,    radl=1.43,   absl=0);    //anode grid (Cu) 
224   AliMedium(7, "GRID$", 11, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
225   
226   AliMaterial(50, "ALUM",     a=26.98,z=13.0,den=2.7,     radl=8.9,    absl=0);    //aluminium sheet (Al)
227   AliMedium(10, "ALUMINUM$", 50, 1, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
228   
229   AliMaterial(31, "COPPER$",  a=63.54,z=29.0,den=8.96,    radl=1.4,    absl=0);    //(Cu)
230   AliMedium(12, "PCB_COPPER", 31, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
231   
232   Float_t  aQuartz[2]={28.09,16.0};  Float_t  zQuartz[2]={14.00, 8.0};  Float_t  wmatQuartz[2]={1,2};
233   AliMixture (20, "QUA",aQuartz,zQuartz,den=2.64,-2, wmatQuartz);//Quarz (SiO2) - trasnparent 
234   AliMedium(3, "QUARTZ$", 20, 1, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
235   
236   AliMixture (21, "QUAO",aQuartz, zQuartz, den=2.64, -2, wmatQuartz);//Quarz (SiO2) - opaque
237   AliMedium(8, "QUARTZO$", 21, 1, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
238   
239   Float_t  aFreon[2]={12,19};  Float_t  zFreon[2]={6,9};  Float_t wmatFreon[2]={6,14};
240   AliMixture (30, "FRE",aFreon,zFreon,den=1.7,-2,wmatFreon);//Freon (C6F14) 
241   AliMedium(4, "FREON$", 30, 1, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
242   
243   Float_t aMethane[2]={12.01,1}; Float_t zMethane[2]={6,1}; Float_t wmatMethane[2]={1,4};
244   AliMixture (40, "MET", aMethane, zMethane, den=7.17e-4,-2, wmatMethane);//methane (CH4)     
245   AliMedium(5, "METHANE$", 40, 1, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
246   
247   AliMixture (41, "METG", aMethane, zMethane, den=7.17e-4, -2, wmatMethane);
248   AliMedium(kGAP, "GAP$", 41, 1, isxfld, sxmgmx,tmaxfd, 0.1, -deemax, epsil, -stmin);
249   
250   Float_t aGlass[5]={12.01, 28.09, 16.,   10.8,  23.};
251   Float_t zGlass[5]={ 6.,   14.,    8.,    5.,   11.};
252   Float_t wGlass[5]={ 0.5,  0.105, 0.355, 0.03,  0.01};
253   AliMixture (32, "GLASS",aGlass, zGlass, den=1.74, 5, wGlass);//Glass 50%C+10.5%Si+35.5%O+3% + 1%
254   AliMedium(11, "GLASS", 32, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
255             
256   Int_t *idtmed = fIdtmed->GetArray()-999;
257   gMC->SetCerenkov(idtmed[1000], kNbins, aPckov, aAbsCH4,    aQeAll, aIdxCH4);
258   gMC->SetCerenkov(idtmed[1001], kNbins, aPckov, aAbsCH4,    aQeAll, aIdxCH4);
259   gMC->SetCerenkov(idtmed[1002], kNbins, aPckov, aAbsSiO2,   aQeAll, aIdxSiO2);
260   gMC->SetCerenkov(idtmed[1003], kNbins, aPckov, aAbsC6F14,  aQeAll, aIdxC6F14);
261   gMC->SetCerenkov(idtmed[1004], kNbins, aPckov, aAbsCH4,    aQeAll, aIdxCH4);
262   gMC->SetCerenkov(idtmed[1005], kNbins, aPckov, aAbsCsI,    aQeCsI, aIdxCH4);
263   gMC->SetCerenkov(idtmed[1006], kNbins, aPckov, aAbsGrid,   aQeAll, aIdxGrid);
264   gMC->SetCerenkov(idtmed[1007], kNbins, aPckov, aAbsOpSiO2, aQeAll, aIdxOpSiO2);
265   gMC->SetCerenkov(idtmed[1008], kNbins, aPckov, aAbsCH4,    aQeAll, aIdxCH4);
266   gMC->SetCerenkov(idtmed[1009], kNbins, aPckov, aAbsGrid,   aQeAll, aIdxGrid);
267   gMC->SetCerenkov(idtmed[1010], kNbins, aPckov, aAbsOpSiO2, aQeAll, aIdxOpSiO2);
268     
269 }//void AliRICH::CreateMaterials()
270 //__________________________________________________________________________________________________
271 Float_t AliRICH::Fresnel(Float_t ene,Float_t pdoti, Bool_t pola)const
272 {
273
274     //ENE(EV), PDOTI=COS(INC.ANG.), PDOTR=COS(POL.PLANE ROT.ANG.)
275     
276     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,
277                       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,
278                       7.8,7.9,8.0,8.1,8.2,8.3,8.4,8.5};
279     Float_t csin[36] = {2.14,2.21,2.33,2.48,2.76,2.97,2.99,2.59,2.81,3.05,
280                         2.86,2.53,2.55,2.66,2.79,2.96,3.18,3.05,2.84,2.81,2.38,2.11,
281                         2.01,2.13,2.39,2.73,3.08,3.15,2.95,2.73,2.56,2.41,2.12,1.95,
282                         1.72,1.53};
283     Float_t csik[36] = {0.,0.,0.,0.,0.,0.196,0.408,0.208,0.118,0.49,0.784,0.543,
284                         0.424,0.404,0.371,0.514,0.922,1.102,1.139,1.376,1.461,1.253,0.878,
285                         0.69,0.612,0.649,0.824,1.347,1.571,1.678,1.763,1.857,1.824,1.824,
286                         1.714,1.498};
287     Float_t xe=ene;
288     Int_t  j=Int_t(xe*10)-49;
289     Float_t cn=csin[j]+((csin[j+1]-csin[j])/0.1)*(xe-en[j]);
290     Float_t ck=csik[j]+((csik[j+1]-csik[j])/0.1)*(xe-en[j]);
291
292     //FORMULAE FROM HANDBOOK OF OPTICS, 33.23 OR
293     //W.R. HUNTER, J.O.S.A. 54 (1964),15 , J.O.S.A. 55(1965),1197
294
295     Float_t sinin=TMath::Sqrt(1-pdoti*pdoti);
296     Float_t tanin=sinin/pdoti;
297
298     Float_t c1=cn*cn-ck*ck-sinin*sinin;
299     Float_t c2=4*cn*cn*ck*ck;
300     Float_t aO=TMath::Sqrt(0.5*(TMath::Sqrt(c1*c1+c2)+c1));
301     Float_t b2=0.5*(TMath::Sqrt(c1*c1+c2)-c1);
302     
303     Float_t rs=((aO-pdoti)*(aO-pdoti)+b2)/((aO+pdoti)*(aO+pdoti)+b2);
304     Float_t rp=rs*((aO-sinin*tanin)*(aO-sinin*tanin)+b2)/((aO+sinin*tanin)*(aO+sinin*tanin)+b2);
305     
306
307     //CORRECTION FACTOR FOR SURFACE ROUGHNESS
308     //B.J. STAGG  APPLIED OPTICS, 30(1991),4113
309
310     Float_t sigraf=18.;
311     Float_t lamb=1240/ene;
312     Float_t fresn;
313  
314     Float_t  rO=TMath::Exp(-(4*TMath::Pi()*pdoti*sigraf/lamb)*(4*TMath::Pi()*pdoti*sigraf/lamb));
315
316     if(pola)
317     {
318         Float_t pdotr=0.8;                                 //DEGREE OF POLARIZATION : 1->P , -1->S
319         fresn=0.5*(rp*(1+pdotr)+rs*(1-pdotr));
320     }
321     else
322         fresn=0.5*(rp+rs);
323       
324     fresn = fresn*rO;
325     return(fresn);
326 }//Fresnel()
327 //__________________________________________________________________________________________________
328 Float_t AliRICH::AbsoCH4(Float_t x)const
329 {
330 //Evaluate the absorbtion lenght of CH4
331   Float_t sch4[9] = {.12,.16,.23,.38,.86,2.8,7.9,28.,80.};              //MB X 10^22
332   Float_t em[9] = {8.1,8.158,8.212,8.267,8.322,8.378,8.435,8.493,8.55};
333   const Float_t kLoschmidt=2.686763e19;                                      // LOSCHMIDT NUMBER IN CM-3
334   const Float_t kPressure=750.,kTemperature=283.;                                      
335   const Float_t kPn=kPressure/760.;
336   const Float_t kTn=kTemperature/273.16;
337   const Float_t kC0=-1.655279e-1;
338   const Float_t kC1=6.307392e-2;
339   const Float_t kC2=-8.011441e-3;
340   const Float_t kC3=3.392126e-4;
341                 
342   Float_t crossSection=0;                        
343   if (x<7.75) 
344     crossSection=.06e-22;
345   else if(x>=7.75 && x<=8.1){                 //------ METHANE CROSS SECTION cm-2 ASTROPH. J. 214, L47 (1978)                                               
346         crossSection=(kC0+kC1*x+kC2*x*x+kC3*x*x*x)*1.e-18;
347   }else if (x> 8.1){
348     Int_t j=0;
349     while (x<=em[j] || x>=em[j+1]){
350       j++;
351       Float_t a=(sch4[j+1]-sch4[j])/(em[j+1]-em[j]);
352       crossSection=(sch4[j]+a*(x-em[j]))*1e-22;
353     }
354   }//if
355     
356     Float_t density=kLoschmidt*kPn/kTn; //CH4 molecular density 1/cm-3
357     return 1./(density*crossSection);
358 }//AbsoCH4()
359 //__________________________________________________________________________________________________
360 void AliRICH::MakeBranch(Option_t* option)
361 {
362 //Create Tree branches for the RICH.
363   if(GetDebug())Info("MakeBranch","Start with option= %s.",option);
364     
365   const Int_t kBufferSize = 4000;
366       
367   const char *cH = strstr(option,"H");
368   const char *cD = strstr(option,"D");
369   const char *cR = strstr(option,"R");
370   const char *cS = strstr(option,"S");
371
372   if(cH&&TreeH()){//H
373     CreateHits();      //branch will be created in AliDetector::MakeBranch
374   }//H     
375   AliDetector::MakeBranch(option);//this is after cH because we need to guarantee that fHits array is created
376       
377   if(cS&&fLoader->TreeS()){//S  
378     CreateSDigits();   MakeBranchInTree(fLoader->TreeS(),"RICH",&fSdigits,kBufferSize,0) ;
379   }//S
380    
381   if(cD&&fLoader->TreeD()){//D
382     CreateDigits();
383     for(Int_t i=0;i<kNCH;i++){ 
384       MakeBranchInTree(fLoader->TreeD(),Form("%s%d",GetName(),i+1),&((*fDigitsNew)[i]),kBufferSize,0);
385     }
386   }//D
387   
388   if(cR&&fLoader->TreeR()){//R
389     CreateClusters();
390     for(Int_t i=0;i<kNCH;i++)
391       MakeBranchInTree(fLoader->TreeR(),Form("%sClusters%d",GetName(),i+1), &((*fClusters)[i]), kBufferSize, 0);    
392   }//R
393   if(GetDebug())Info("MakeBranch","Stop.");   
394 }//void AliRICH::MakeBranch(Option_t* option)
395 //__________________________________________________________________________________________________
396 void AliRICH::SetTreeAddress()
397 {
398 //Set branch address for the Hits and Digits Tree.
399   if(GetDebug())Info("SetTreeAddress","Start.");
400       
401   TBranch *branch;
402     
403   if(fLoader->TreeH()){//H
404     if(GetDebug())Info("SetTreeAddress","tree H is requested.");
405     CreateHits();//branch map will be in AliDetector::SetTreeAddress    
406   }//H
407   AliDetector::SetTreeAddress();//this is after TreeH because we need to guarantee that fHits array is created
408
409   if(fLoader->TreeS()){//S
410     if(GetDebug())Info("SetTreeAddress","tree S is requested.");
411     branch=fLoader->TreeS()->GetBranch(GetName());        if(branch){CreateSDigits();   branch->SetAddress(&fSdigits);}
412   }//S
413     
414   if(fLoader->TreeD()){//D    
415     if(GetDebug())Info("SetTreeAddress","tree D is requested.");
416     for(int i=0;i<kNCH;i++){      
417       branch=fLoader->TreeD()->GetBranch(Form("%s%d",GetName(),i+1)); 
418       if(branch){CreateDigits(); branch->SetAddress(&((*fDigitsNew)[i]));}
419     }
420   }//D
421     
422   if(fLoader->TreeR()){//R
423     if(GetDebug())Info("SetTreeAddress","tree R is requested.");
424     for(int i=0;i<kNCH;i++){         
425       branch=fLoader->TreeR()->GetBranch(Form("%sClusters%d" ,GetName(),i+1));
426       if(branch){CreateClusters(); branch->SetAddress(&((*fClusters)[i]));}
427     }
428   }//R
429   if(GetDebug())Info("SetTreeAddress","Stop.");
430 }//void AliRICH::SetTreeAddress()
431 //__________________________________________________________________________________________________
432 void AliRICH::Print(Option_t *option)const
433 {
434 //Debug printout
435   TObject::Print(option);
436   P()->Dump();
437   fChambers->Print(option);  
438 }//void AliRICH::Print(Option_t *option)const
439 //__________________________________________________________________________________________________
440 void AliRICH::CreateGeometry()
441 {
442 //Creates detailed geometry simulation (currently GEANT volumes tree)         
443   if(GetDebug())Info("CreateGeometry","Start.");
444 //Opaque quartz thickness
445   Float_t oquaThickness = .5;
446 //CsI dimensions
447   Float_t pcX=P()->PcSizeX();
448   Float_t pcY=P()->PcSizeY();
449   
450   Int_t *idtmed = fIdtmed->GetArray()-999;
451     
452   Int_t i;
453   Float_t zs;
454   Int_t idrotm[1099];
455   Float_t par[3];
456     
457 //External aluminium box 
458   par[0]=68.8;par[1]=13;par[2]=70.86;  gMC->Gsvolu("RICH", "BOX ", idtmed[1009], par, 3);
459 //Air 
460   par[0]=66.3;   par[1] = 13; par[2] = 68.35;      gMC->Gsvolu("SRIC", "BOX ", idtmed[1000], par, 3); 
461 //Air 2 (cutting the lower part of the box)
462   par[0]=1.25;    par[1] = 3;    par[2] = 70.86;   gMC->Gsvolu("AIR2", "BOX ", idtmed[1000], par, 3);
463 //Air 3 (cutting the lower part of the box)
464   par[0]=66.3;    par[1] = 3;  par[2] = 1.2505;    gMC->Gsvolu("AIR3", "BOX ", idtmed[1000], par, 3);
465 //Honeycomb 
466   par[0]=66.3;par[1]=0.188;  par[2] = 68.35;       gMC->Gsvolu("HONE", "BOX ", idtmed[1001], par, 3);
467 //Aluminium sheet 
468   par[0]=66.3;par[1]=0.025;par[2]=68.35;           gMC->Gsvolu("ALUM", "BOX ", idtmed[1009], par, 3);
469   //par[0] = 66.5; par[1] = .025; par[2] = 63.1;
470 //Quartz 
471   par[0]=P()->QuartzWidth()/2;par[1]=P()->QuartzThickness()/2;par[2]=P()->QuartzLength()/2;
472   gMC->Gsvolu("QUAR", "BOX ", idtmed[1002], par, 3);
473 //Spacers (cylinders) 
474   par[0]=0.;par[1]=.5;par[2]=P()->FreonThickness()/2;  gMC->Gsvolu("SPAC", "TUBE", idtmed[1002], par, 3);    
475 //Feet (freon slabs supports)
476   par[0] = .7;  par[1] = .3;  par[2] = 1.9;        gMC->Gsvolu("FOOT", "BOX", idtmed[1009], par, 3);
477 //Opaque quartz 
478   par[0]=P()->QuartzWidth()/2;par[1]= .2;par[2]=P()->QuartzLength()/2;
479   gMC->Gsvolu("OQUA", "BOX ", idtmed[1007], par, 3);
480 //Frame of opaque quartz
481   par[0]=P()->OuterFreonWidth()/2;par[1]=P()->FreonThickness()/2;par[2]=P()->OuterFreonLength()/2; 
482   gMC->Gsvolu("OQF1", "BOX ", idtmed[1007], par, 3);
483   par[0]=P()->InnerFreonWidth()/2;par[1]=P()->FreonThickness()/2;par[2]=P()->InnerFreonLength()/2; 
484   gMC->Gsvolu("OQF2", "BOX ", idtmed[1007], par, 3);
485 //Freon 
486   par[0]=P()->OuterFreonWidth()/2 - oquaThickness;
487   par[1]=P()->FreonThickness()/2;
488   par[2]=P()->OuterFreonLength()/2 - 2*oquaThickness; 
489   gMC->Gsvolu("FRE1", "BOX ", idtmed[1003], par, 3);
490
491   par[0]=P()->InnerFreonWidth()/2 - oquaThickness;
492   par[1]=P()->FreonThickness()/2;
493   par[2]=P()->InnerFreonLength()/2 - 2*oquaThickness; 
494   gMC->Gsvolu("FRE2", "BOX ", idtmed[1003], par, 3);    
495 //Methane 
496   par[0]=pcX/2;par[1]=P()->GapThickness()/2;par[2]=pcY/2;         gMC->Gsvolu("META","BOX ",idtmed[1004], par, 3);
497 //Methane gap 
498   par[0]=pcX/2;par[1]=P()->ProximityGap()/2;par[2]=pcY/2;gMC->Gsvolu("GAP ","BOX ",(*fIdtmed)[kGAP],par,3);
499 //CsI PC
500   par[0]=pcX/2;par[1]=.25;par[2]=pcY/2;  gMC->Gsvolu("CSI ", "BOX ", (*fIdtmed)[kCSI], par, 3);
501 //Anode grid 
502   par[0] = 0.;par[1] = .001;par[2] = 20.;  gMC->Gsvolu("GRID", "TUBE", idtmed[1006], par, 3);
503
504 //Wire supports
505 //Bar of metal
506   par[0]=pcX/2;par[1]=1.05;par[2]=1.05;  gMC->Gsvolu("WSMe", "BOX ", idtmed[1009], par, 3);
507 //Ceramic pick up (base)
508   par[0]=pcX/2;par[1]= .25;par[2]=1.05;  gMC->Gsvolu("WSG1", "BOX ", idtmed[1010], par, 3);
509 //Ceramic pick up (head)
510   par[0] = pcX/2;par[1] = .1;par[2] = .1;  gMC->Gsvolu("WSG2", "BOX ", idtmed[1010], par, 3);
511
512 //Aluminium supports for methane and CsI
513 //Short bar
514   par[0]=pcX/2;par[1]=P()->GapThickness()/2 + .25; par[2] = (68.35 - pcY/2)/2;
515   gMC->Gsvolu("SMSH", "BOX", idtmed[1009], par, 3);
516 //Long bar
517   par[0]=(66.3 - pcX/2)/2;par[1]=P()->GapThickness()/2+.25;par[2]=pcY/2+68.35-pcY/2;
518   gMC->Gsvolu("SMLG", "BOX", idtmed[1009], par, 3);
519     
520 //Aluminium supports for freon
521 //Short bar
522   par[0] = P()->QuartzWidth()/2; par[1] = .3; par[2] = (68.35 - P()->QuartzLength()/2)/2;
523   gMC->Gsvolu("SFSH", "BOX", idtmed[1009], par, 3);    
524 //Long bar
525   par[0] = (66.3 - P()->QuartzWidth()/2)/2; par[1] = .3;
526   par[2] = P()->QuartzLength()/2 + 68.35 - P()->QuartzLength()/2;
527   gMC->Gsvolu("SFLG", "BOX", idtmed[1009], par, 3);    
528 //PCB backplane
529   par[0] = pcX/2;par[1] = .25; par[2] = pcY/4 -.5025;  gMC->Gsvolu("PCB ", "BOX", idtmed[1011], par, 3);
530
531 //Backplane supports
532 //Aluminium slab
533   par[0] = 33.15;par[1] = 2;par[2] = 21.65;  gMC->Gsvolu("BACK", "BOX", idtmed[1009], par, 3);    
534 //Big hole
535   par[0] = 9.05; par[1] = 2; par[2] = 4.4625;  gMC->Gsvolu("BKHL", "BOX", idtmed[1000], par, 3);
536 //Small hole
537   par[0] = 5.7;par[1] = 2;par[2] = 4.4625;  gMC->Gsvolu("BKHS", "BOX", idtmed[1000], par, 3);
538 //Place holes inside backplane support
539   gMC->Gspos("BKHS", 1, "BACK", .8 + 5.7,0., .6 + 4.4625, 0, "ONLY");
540   gMC->Gspos("BKHS", 2, "BACK", -.8 - 5.7,0., .6 + 4.4625, 0, "ONLY");
541   gMC->Gspos("BKHS", 3, "BACK", .8 + 5.7,0., -.6 - 4.4625, 0, "ONLY");
542   gMC->Gspos("BKHS", 4, "BACK", -.8 - 5.7,0., -.6 - 4.4625, 0, "ONLY");
543   gMC->Gspos("BKHS", 5, "BACK", .8 + 5.7,0., .6 + 8.925 + 1.2 + 4.4625, 0, "ONLY");
544   gMC->Gspos("BKHS", 6, "BACK", -.8 - 5.7,0., .6 + 8.925 + 1.2 + 4.4625, 0, "ONLY");
545   gMC->Gspos("BKHS", 7, "BACK", .8 + 5.7,0., -.6 - 8.925 - 1.2 - 4.4625, 0, "ONLY");
546   gMC->Gspos("BKHS", 8, "BACK", -.8 - 5.7,0., -.6 - 8.925 - 1.2 - 4.4625, 0, "ONLY");
547   gMC->Gspos("BKHL", 1, "BACK", .8 + 11.4 + 1.6 + 9.05, 0., .6 + 4.4625, 0, "ONLY");
548   gMC->Gspos("BKHL", 2, "BACK", -.8 - 11.4 - 1.6 - 9.05, 0., .6 + 4.4625, 0, "ONLY");
549   gMC->Gspos("BKHL", 3, "BACK", .8 + 11.4 + 1.6 + 9.05, 0., -.6 - 4.4625, 0, "ONLY");
550   gMC->Gspos("BKHL", 4, "BACK", -.8 - 11.4 - 1.6 - 9.05, 0., -.6 - 4.4625, 0, "ONLY");
551   gMC->Gspos("BKHL", 5, "BACK", .8 + 11.4+ 1.6 + 9.05, 0., .6 + 8.925 + 1.2 + 4.4625, 0, "ONLY");
552   gMC->Gspos("BKHL", 6, "BACK", -.8 - 11.4 - 1.6 - 9.05, 0., .6 + 8.925 + 1.2 + 4.4625, 0, "ONLY");
553   gMC->Gspos("BKHL", 7, "BACK", .8 + 11.4 + 1.6 + 9.05, 0., -.6 - 8.925 - 1.2 - 4.4625, 0, "ONLY");
554   gMC->Gspos("BKHL", 8, "BACK", -.8 - 11.4 - 1.6 - 9.05, 0., -.6 - 8.925 - 1.2 - 4.4625, 0, "ONLY");
555 //Place material inside RICH 
556   gMC->Gspos("SRIC", 1, "RICH", 0.,0., 0., 0, "ONLY");
557   gMC->Gspos("AIR2", 1, "RICH", 66.3 + 1.2505, 1.276-P()->GapThickness()/2-P()->QuartzThickness()-P()->FreonThickness()- .4 - .6 - .05 - .376 -.5 - 3.35, 0., 0, "ONLY");
558   gMC->Gspos("AIR2", 2, "RICH", -66.3 - 1.2505,1.276-P()->GapThickness()/2-P()->QuartzThickness()-P()->FreonThickness()- .4 - .6 - .05 - .376 -.5 - 3.35, 0., 0, "ONLY");
559   gMC->Gspos("AIR3", 1, "RICH", 0., 1.276-P()->GapThickness()/2 - P()->QuartzThickness() - P()->FreonThickness()- .4 - .6 - .05 - .376 -.5 - 3.35, -68.35 - 1.25, 0, "ONLY");
560   gMC->Gspos("AIR3", 2, "RICH", 0., 1.276 - P()->GapThickness()/2 - P()->QuartzThickness() - P()->FreonThickness()- .4 - .6 - .05 - .376 -.5 - 3.35,  68.35 + 1.25, 0, "ONLY");
561   gMC->Gspos("ALUM", 1, "SRIC", 0., 1.276 - P()->GapThickness()/2 - P()->QuartzThickness() - P()->FreonThickness()- .4 - .6 - .05 - .376 -.025, 0., 0, "ONLY");
562   gMC->Gspos("HONE", 1, "SRIC", 0., 1.276- P()->GapThickness()/2  - P()->QuartzThickness() - P()->FreonThickness()- .4 - .6 - .05 - .188, 0., 0, "ONLY");
563   gMC->Gspos("ALUM", 2, "SRIC", 0., 1.276 - P()->GapThickness()/2 - P()->QuartzThickness() - P()->FreonThickness()- .4 - .6 - .025, 0., 0, "ONLY");
564   gMC->Gspos("FOOT", 1, "SRIC", 64.95, 1.276 - P()->GapThickness()/2 - P()->QuartzThickness() - P()->FreonThickness()- .4 - .3, 36.9, 0, "ONLY");
565   gMC->Gspos("FOOT", 2, "SRIC", 21.65, 1.276 - P()->GapThickness()/2 - P()->QuartzThickness() - P()->FreonThickness()- .4 - .3 , 36.9, 0, "ONLY");
566   gMC->Gspos("FOOT", 3, "SRIC", -21.65, 1.276 - P()->GapThickness()/2 - P()->QuartzThickness() - P()->FreonThickness()- .4 - .3, 36.9, 0, "ONLY");
567   gMC->Gspos("FOOT", 4, "SRIC", -64.95, 1.276 - P()->GapThickness()/2 - P()->QuartzThickness() - P()->FreonThickness()- .4 - .3, 36.9, 0, "ONLY");
568   gMC->Gspos("FOOT", 5, "SRIC", 64.95, 1.276 - P()->GapThickness()/2 - P()->QuartzThickness() - P()->FreonThickness()- .4 - .3, -36.9, 0, "ONLY");
569   gMC->Gspos("FOOT", 6, "SRIC", 21.65, 1.276 - P()->GapThickness()/2 - P()->QuartzThickness() - P()->FreonThickness()- .4 - .3, -36.9, 0, "ONLY");
570   gMC->Gspos("FOOT", 7, "SRIC", -21.65, 1.276 - P()->GapThickness()/2 - P()->QuartzThickness() - P()->FreonThickness()- .4 - .3, -36.9, 0, "ONLY");
571   gMC->Gspos("FOOT", 8, "SRIC", -64.95, 1.276 - P()->GapThickness()/2 - P()->QuartzThickness() - P()->FreonThickness()- .4 - .3, -36.9, 0, "ONLY");
572   gMC->Gspos("OQUA", 1, "SRIC", 0., 1.276 - P()->GapThickness()/2 - P()->QuartzThickness() - P()->FreonThickness()- .2, 0., 0, "ONLY");
573 // Methane supports
574   gMC->Gspos("SMLG", 1, "SRIC", pcX/2 + (66.3 - pcX/2)/2, 1.276 + .25, 0., 0, "ONLY");
575   gMC->Gspos("SMLG", 2, "SRIC", - pcX/2 - (66.3 - pcX/2)/2, 1.276 + .25, 0., 0, "ONLY");
576   gMC->Gspos("SMSH", 1, "SRIC", 0., 1.276 + .25, pcY/2 + (68.35 - pcY/2)/2, 0, "ONLY");
577   gMC->Gspos("SMSH", 2, "SRIC", 0., 1.276 + .25, - pcY/2 - (68.35 - pcY/2)/2, 0, "ONLY");
578 //Freon supports
579   Float_t suppY = 1.276 - P()->GapThickness()/2- P()->QuartzThickness() -P()->FreonThickness() - .2 + .3; //y position of freon supports
580   gMC->Gspos("SFLG", 1, "SRIC", P()->QuartzWidth()/2 + (66.3 - P()->QuartzWidth()/2)/2, suppY, 0., 0, "ONLY");
581   gMC->Gspos("SFLG", 2, "SRIC", - P()->QuartzWidth()/2 - (66.3 - P()->QuartzWidth()/2)/2, suppY, 0., 0, "ONLY");
582   gMC->Gspos("SFSH", 1, "SRIC", 0., suppY, P()->QuartzLength()/2 + (68.35 - P()->QuartzLength()/2)/2, 0, "ONLY");
583   gMC->Gspos("SFSH", 2, "SRIC", 0., suppY, - P()->QuartzLength()/2 - (68.35 - P()->QuartzLength()/2)/2, 0, "ONLY");
584   AliMatrix(idrotm[1019], 0., 0., 90., 0., 90., 90.);
585 //Place spacers
586   Int_t nspacers = 30;
587   for (i = 0; i < nspacers/3; i++) {
588     zs = -11.6/2 + (TMath::Abs(nspacers/6) - i) * 12.2;
589     gMC->Gspos("SPAC", i, "FRE1", 10.5, 0., zs, idrotm[1019], "ONLY");  //Original settings 
590   }
591   for (i = nspacers/3; i < (nspacers*2)/3; i++) {
592     zs = -11.6/2 + (nspacers/3 + TMath::Abs(nspacers/6) - i) * 12.2;
593     gMC->Gspos("SPAC", i, "FRE1", 0, 0., zs, idrotm[1019], "ONLY");  //Original settings 
594   }
595   for (i = (nspacers*2)/3; i < nspacers; ++i) {
596     zs = -11.6/2 + ((nspacers*2)/3 + TMath::Abs(nspacers/6) - i) * 12.2;
597     gMC->Gspos("SPAC", i, "FRE1", -10.5, 0., zs, idrotm[1019], "ONLY"); //Original settings  
598   }
599   for (i = 0; i < nspacers/3; i++) {
600     zs = -11.6/2 + (TMath::Abs(nspacers/6) - i) * 12.2;
601     gMC->Gspos("SPAC", i, "FRE2", 10.5, 0., zs, idrotm[1019], "ONLY");  //Original settings 
602   }
603   for (i = nspacers/3; i < (nspacers*2)/3; i++) {
604     zs = -11.6/2 + (nspacers/3 + TMath::Abs(nspacers/6) - i) * 12.2;
605     gMC->Gspos("SPAC", i, "FRE2", 0, 0., zs, idrotm[1019], "ONLY");  //Original settings 
606   }
607   for (i = (nspacers*2)/3; i < nspacers; ++i) {
608     zs = -11.6/2 + ((nspacers*2)/3 + TMath::Abs(nspacers/6) - i) * 12.2;
609     gMC->Gspos("SPAC", i, "FRE2", -10.5, 0., zs, idrotm[1019], "ONLY"); //Original settings  
610   }
611   gMC->Gspos("FRE1", 1, "OQF1", 0., 0., 0., 0, "ONLY");
612   gMC->Gspos("FRE2", 1, "OQF2", 0., 0., 0., 0, "ONLY");
613   gMC->Gspos("OQF1", 1, "SRIC", P()->OuterFreonWidth()/2 + P()->InnerFreonWidth()/2 + 2, 1.276 - P()->GapThickness()/2- P()->QuartzThickness() -P()->FreonThickness()/2, 0., 0, "ONLY"); //Original settings (31.3)
614   gMC->Gspos("OQF2", 2, "SRIC", 0., 1.276 - P()->GapThickness()/2 - P()->QuartzThickness() - P()->FreonThickness()/2, 0., 0, "ONLY");          //Original settings 
615   gMC->Gspos("OQF1", 3, "SRIC", - (P()->OuterFreonWidth()/2 + P()->InnerFreonWidth()/2) - 2, 1.276 - P()->GapThickness()/2 - P()->QuartzThickness() - P()->FreonThickness()/2, 0., 0, "ONLY");       //Original settings (-31.3)
616   gMC->Gspos("QUAR", 1, "SRIC", 0., 1.276 - P()->GapThickness()/2 - P()->QuartzThickness()/2, 0., 0, "ONLY");
617   gMC->Gspos("GAP ", 1, "META", 0., P()->GapThickness()/2 - P()->ProximityGap()/2 - 0.0001, 0., 0, "ONLY");
618   gMC->Gspos("META", 1, "SRIC", 0., 1.276, 0., 0, "ONLY");
619   gMC->Gspos("CSI ", 1, "SRIC", 0., 1.276 + P()->GapThickness()/2 + .25, 0., 0, "ONLY");
620 //Wire support placing
621   gMC->Gspos("WSG2", 1, "GAP ", 0., P()->ProximityGap()/2 - .1, 0., 0, "ONLY");
622   gMC->Gspos("WSG1", 1, "CSI ", 0., 0., 0., 0, "ONLY");
623   gMC->Gspos("WSMe", 1, "SRIC ", 0., 1.276 + P()->GapThickness()/2 + .5 + 1.05, 0., 0, "ONLY");
624 //Backplane placing
625   gMC->Gspos("BACK", 1, "SRIC ", -33.15, 1.276 + P()->GapThickness()/2 + .5 + 2.1 + 2, 43.3, 0, "ONLY");
626   gMC->Gspos("BACK", 2, "SRIC ", 33.15, 1.276 + P()->GapThickness()/2 + .5 + 2.1 + 2 , 43.3, 0, "ONLY");
627   gMC->Gspos("BACK", 3, "SRIC ", -33.15, 1.276 + P()->GapThickness()/2 + .5 + 2.1 + 2, 0., 0, "ONLY");
628   gMC->Gspos("BACK", 4, "SRIC ", 33.15, 1.276 + P()->GapThickness()/2 + .5 + 2.1 + 2, 0., 0, "ONLY");
629   gMC->Gspos("BACK", 5, "SRIC ", 33.15, 1.276 + P()->GapThickness()/2 + .5 + 2.1 + 2, -43.3, 0, "ONLY");
630   gMC->Gspos("BACK", 6, "SRIC ", -33.15, 1.276 + P()->GapThickness()/2 + .5 + 2.1 + 2, -43.3, 0, "ONLY");
631 //PCB placing
632   gMC->Gspos("PCB ", 1, "SRIC ", 0.,  1.276 + P()->GapThickness()/2 + .5 + 1.05, pcX/4 + .5025 + 2.5, 0, "ONLY");
633   gMC->Gspos("PCB ", 2, "SRIC ", 0.,  1.276 + P()->GapThickness()/2 + .5 + 1.05, -pcX/4 - .5025 - 2.5, 0, "ONLY");
634
635 //place chambers into mother volume ALIC
636   for(int i=1;i<=kNCH;i++){
637     AliMatrix(idrotm[1000+i],C(i)->ThetaXd(),C(i)->PhiXd(),
638                              C(i)->ThetaYd(),C(i)->PhiYd(),
639                              C(i)->ThetaZd(),C(i)->PhiZd());
640     gMC->Gspos("RICH",i,"ALIC",C(i)->X(),C(i)->Y(),C(i)->Z(),idrotm[1000+i], "ONLY");
641   }
642
643   if(GetDebug())Info("CreateGeometry","Stop.");  
644 }//void AliRICH::CreateGeometry()
645 //__________________________________________________________________________________________________
646 void AliRICH::CreateChambers()
647 {
648 //create all RICH Chambers on each call. Previous chambers deleted
649   if(fChambers) delete fChambers;
650   if(GetDebug())Info("CreateChambers","Creating RICH chambers.");
651   fChambers=new TObjArray(kNCH);
652   fChambers->SetOwner();
653   for(int i=0;i<kNCH;i++)  fChambers->AddAt(new AliRICHChamber(i+1,P()),i);  
654 }//void AliRICH::CreateChambers()
655 //__________________________________________________________________________________________________
656 void AliRICH::GenerateFeedbacks(Int_t iChamber,Float_t eloss)
657 {
658 // Generate FeedBack photons 
659 // eloss=0 means photon so only pulse height distribution is to be analysed. This one is done in AliRICHParam::TotQdc()
660   
661   TLorentzVector x4;
662   gMC->TrackPosition(x4);  
663   TVector2 x2=C(iChamber)->Glob2Loc(x4);
664   Int_t sector=P()->Sector(x2);  if(sector==kBad) return; //hit in dead zone nothing to produce
665   Int_t iTotQdc=P()->TotQdc(x2,eloss);
666   Int_t iNphotons=gMC->GetRandom()->Poisson(P()->AlphaFeedback(sector)*iTotQdc);    
667   if(GetDebug())Info("GenerateFeedbacks","N photons=%i",iNphotons);
668   Int_t j;
669   Float_t cthf, phif, enfp = 0, sthf, e1[3], e2[3], e3[3], vmod, uswop,dir[3], phi,pol[3], mom[4];
670 //Generate photons
671   for(Int_t i=0;i<iNphotons;i++){//feedbacks loop
672     Double_t ranf[2];
673     gMC->GetRandom()->RndmArray(2,ranf);    //Sample direction
674     cthf=ranf[0]*2-1.0;
675     if(cthf<0) continue;
676     sthf = TMath::Sqrt((1 - cthf) * (1 + cthf));
677     phif = ranf[1] * 2 * TMath::Pi();
678     
679     if(Double_t randomNumber=gMC->GetRandom()->Rndm()<=0.57)
680       enfp = 7.5e-9;
681     else if(randomNumber<=0.7)
682       enfp = 6.4e-9;
683     else
684       enfp = 7.9e-9;
685     
686
687     dir[0] = sthf * TMath::Sin(phif);    dir[1] = cthf;    dir[2] = sthf * TMath::Cos(phif);
688     gMC->Gdtom(dir, mom, 2);
689     mom[0]*=enfp;    mom[1]*=enfp;    mom[2]*=enfp;
690     mom[3] = TMath::Sqrt(mom[0]*mom[0]+mom[1]*mom[1]+mom[2]*mom[2]);
691     
692     // Polarisation
693     e1[0]=      0;    e1[1]=-dir[2];    e1[2]= dir[1];
694     e2[0]=-dir[1];    e2[1]= dir[0];    e2[2]=      0;
695     e3[0]= dir[1];    e3[1]=      0;    e3[2]=-dir[0];
696     
697     vmod=0;
698     for(j=0;j<3;j++) vmod+=e1[j]*e1[j];
699     if (!vmod) for(j=0;j<3;j++) {
700       uswop=e1[j];
701       e1[j]=e3[j];
702       e3[j]=uswop;
703     }
704     vmod=0;
705     for(j=0;j<3;j++) vmod+=e2[j]*e2[j];
706     if (!vmod) for(j=0;j<3;j++) {
707       uswop=e2[j];
708       e2[j]=e3[j];
709       e3[j]=uswop;
710     }
711     
712     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;    
713     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;
714     
715     phi = gMC->GetRandom()->Rndm()* 2 * TMath::Pi();
716     for(j=0;j<3;j++) pol[j]=e1[j]*TMath::Sin(phi)+e2[j]*TMath::Cos(phi);
717     gMC->Gdtom(pol, pol, 2);
718     Int_t outputNtracksStored;    
719     gAlice->GetMCApp()->PushTrack(1,                 //do not transport
720                      gAlice->GetMCApp()->GetCurrentTrackNumber(),//parent track 
721                      kFeedback,                      //PID
722                      mom[0],mom[1],mom[2],mom[3],    //track momentum  
723                      x4.X(),x4.Y(),x4.Z(),x4.T(),    //track origin 
724                      pol[0],pol[1],pol[2],           //polarization
725                      kPFeedBackPhoton,
726                      outputNtracksStored,
727                      1.0);    
728   }//feedbacks loop
729 }//GenerateFeedbacks()
730 //__________________________________________________________________________________________________