new AliRICHcluster added
[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 <TArrayF.h>
17 #include <TGeometry.h>
18 #include <TBRIK.h>
19 #include <TTUBE.h>
20 #include <TFile.h>
21 #include <TNode.h> 
22 #include <TObjArray.h>
23 #include <AliMagF.h>
24 #include "AliRICH.h"
25 #include "AliRICHParam.h"
26 #include <AliRun.h>
27 #include <AliRunDigitizer.h>
28 #include "AliMC.h"
29 #include <TVirtualMC.h>
30  
31 ClassImp(AliRICHhit)
32 //__________________________________________________________________________________________________
33 void AliRICHhit::Print(Option_t*)const
34 {
35   Info("","chamber=%2i, PID=%9i, TID=%6i, eloss=%8.3f eV",fChamber,fPid,fTrack,fEloss*1e9);
36 }
37 //__________________________________________________________________________________________________
38 ClassImp(AliRICHdigit)
39 //__________________________________________________________________________________________________
40 void AliRICHdigit::Print(Option_t*)const
41 {
42   Info("","ID=%6i, chamber=%2i, PadX=%3i, PadY=%3i, Q=%6.2f, TID1=%5i, TID2=%5i, TID3=%5i",
43          Id(),fChamber,fPadX,fPadY,fQdc,fTracks[0],fTracks[1],fTracks[2]);
44 }
45 //__________________________________________________________________________________________________
46 ClassImp(AliRICHcluster)
47 //__________________________________________________________________________________________________
48 void AliRICHcluster::Print(Option_t*)const
49 {
50   Info("","chamber=%2i,size=%3i,dim=%5i,x=%6.3f,y=%6.3f,Q=%4i,status=%i",
51             fChamber,fSize,fDimXY,fX,fY,fQdc,fStatus);
52 }
53 //__________________________________________________________________________________________________
54 ClassImp(AliRICH)    
55 //__________________________________________________________________________________________________
56 // RICH manager class   
57 //BEGIN_HTML
58 /*
59   <img src="gif/alirich.gif">
60 */
61 //END_HTML
62 //__________________________________________________________________________________________________
63 AliRICH::AliRICH()
64         :AliDetector() 
65 {//Default ctor should not contain any new operators
66   fpParam     =0;
67   fChambers   =0;   
68 //AliDetector ctor deals with Hits and Digits  
69   fSdigits    =0; fNsdigits   =0;
70   fDigitsNew  =0; for(int i=0;i<kNCH;i++) fNdigitsNew[i]  =0;
71   fClusters   =0; for(int i=0;i<kNCH;i++) fNclusters[i]=0;
72   
73   fCerenkovs  =0; fNcerenkovs =0;
74   fSpecials   =0; fNspecials  =0;  
75   fDchambers  =0; for(int i=0;i<kNCH;i++) fNdch[i]=0;
76   fRawClusters=0; for(int i=0;i<kNCH;i++) fNrawch[i]=0;  
77   fCkovNumber=fFreonProd=0;  
78 }//AliRICH::AliRICH()
79 //__________________________________________________________________________________________________
80 AliRICH::AliRICH(const char *name, const char *title)
81         :AliDetector(name,title)
82 {//Named ctor
83   if(GetDebug())Info("named ctor","Start.");
84   fpParam     =   new AliRICHParam;
85   fChambers = 0;  CreateChambers();
86 //AliDetector ctor deals with Hits and Digits (reset them to 0, does not create them)
87   fHits=       0;     CreateHits();          gAlice->GetMCApp()->AddHitList(fHits);
88   fSdigits=    0;
89   fDigitsNew=  0;
90   fClusters=   0;
91   
92   fCerenkovs=  0;     CreateCerenkovsOld();  gAlice->GetMCApp()->AddHitList(fCerenkovs);
93   fSpecials=   0;     CreateSpecialsOld();   
94   fDchambers=  0;  
95   fRawClusters=0;  
96   
97   fCkovNumber=fFreonProd=0;  
98   if(GetDebug())Info("named ctor","Stop.");
99 }//AliRICH::AliRICH(const char *name, const char *title)
100 //__________________________________________________________________________________________________
101 AliRICH::~AliRICH()
102 {//dtor
103   if(GetDebug()) Info("dtor","Start.");
104
105   if(fpParam)    delete fpParam;
106   if(fChambers)  delete fChambers;
107   
108   if(fHits)      delete fHits;
109   if(fSdigits)   delete fSdigits;
110   if(fDigits)    delete fDigits;
111   if(fDigitsNew) {fDigitsNew->Delete();   delete fDigitsNew;}
112   if(fClusters)  {fClusters->Delete();    delete fClusters;}
113   
114   if(fCerenkovs) delete fCerenkovs;
115   if(fSpecials)  delete fSpecials;
116   if(fDchambers)   {fDchambers->Delete();     delete fDchambers;}
117   if(fRawClusters) {fRawClusters->Delete();   delete fRawClusters;}          
118   if(GetDebug()) Info("dtor","Stop.");    
119 }//AliRICH::~AliRICH()
120 //__________________________________________________________________________________________________
121 void AliRICH::Hits2SDigits()
122 {//Create a list of sdigits corresponding to list of hits. Every hit generates one or more sdigits.
123   if(GetDebug()) Info("Hit2SDigits","Start.");
124   GetLoader()->LoadHits(); 
125   
126   for(Int_t iEventN=0;iEventN<gAlice->GetEventsPerRun();iEventN++){//events loop
127     gAlice->GetRunLoader()->GetEvent(iEventN);
128     
129     if(!GetLoader()->TreeS()) GetLoader()->MakeTree("S");  
130     MakeBranch("S");
131     
132     ResetHits();  ResetSDigits();  
133     for(Int_t iPrimN=0;iPrimN<GetLoader()->TreeH()->GetEntries();iPrimN++){//prims loop
134       GetLoader()->TreeH()->GetEntry(iPrimN);
135       for(Int_t iHitN=0;iHitN<Hits()->GetEntries();iHitN++){//hits loop          
136         AliRICHhit *pHit=(AliRICHhit*)Hits()->At(iHitN);        
137         
138         TVector3 globX3(pHit->X(),pHit->Y(),pHit->Z());        
139         TVector3 locX3=C(pHit->C())->Glob2Loc(globX3);
140         
141         Int_t sector;
142         Int_t iTotQdc=Param()->Loc2TotQdc(locX3,pHit->Eloss(),pHit->Pid(),sector);
143         
144         Int_t iPadXmin,iPadXmax,iPadYmin,iPadYmax;
145         AliRICHParam::Loc2Area(locX3,iPadXmin,iPadYmin,iPadXmax,iPadYmax);
146         for(Int_t iPadY=iPadYmin;iPadY<=iPadYmax;iPadY++)
147           for(Int_t iPadX=iPadXmin;iPadX<=iPadXmax;iPadX++){
148             Double_t padQdc=iTotQdc*Param()->Loc2PadFrac(locX3,iPadX,iPadY);
149             if(padQdc>0.1) AddSDigit(pHit->C(),iPadX,iPadY,padQdc,pHit->GetTrack());
150           }            
151       }//specials loop
152     }//prims loop
153     GetLoader()->TreeS()->Fill();
154     GetLoader()->WriteSDigits("OVERWRITE");
155     if(GetDebug()) Info("Hit2SDigits","Event %i processed.",iEventN);
156   }//events loop  
157   GetLoader()->UnloadHits();   GetLoader()->UnloadSDigits();  
158   ResetHits();                 ResetSDigits();
159   if(GetDebug()) Info("Hit2SDigits","Stop.");
160 }//void AliRICH::Hits2SDigits()
161 //__________________________________________________________________________________________________
162 void AliRICH::SDigits2Digits()
163 {//Generate digits from sdigits.
164   if(GetDebug()) Info("SDigits2Digits","Start.");
165
166   GetLoader()->LoadSDigits();
167   
168   for(Int_t iEventN=0;iEventN<gAlice->GetEventsPerRun();iEventN++){//events loop
169     gAlice->GetRunLoader()->GetEvent(iEventN);
170     
171     if(!GetLoader()->TreeD()) GetLoader()->MakeTree("D");  MakeBranch("D"); //create TreeD with RICH branches 
172     ResetSDigits();ResetDigitsOld();//reset lists of sdigits and digits
173     GetLoader()->TreeS()->GetEntry(0);  
174     SDigits()->Sort();
175   
176     Int_t chamber,x,y,tr[3],id;
177     chamber=x=y=tr[0]=tr[1]=tr[2]=id=kBad;
178     Double_t q=kBad;
179     Int_t iNdigitsPerPad=kBad;//how many sdigits for a given pad
180         
181     for(Int_t i=0;i<SDigits()->GetEntries();i++){//sdigits loop (sorted)
182       AliRICHdigit *pSdig=(AliRICHdigit*)SDigits()->At(i);
183       if(pSdig->Id()==id){//still the same pad
184         iNdigitsPerPad++;
185         q+=pSdig->Q();
186         if(iNdigitsPerPad<=3)
187           tr[iNdigitsPerPad-1]=pSdig->T(0);
188         else
189           Info("","More then 3 sdigits for the given pad");
190       }else{//new pad, add the pevious one
191         if(id!=kBad) AddDigit(chamber,x,y,(Int_t)q,tr[0],tr[1],tr[2]);//ch-xpad-ypad-qdc-tr1-2-3
192         chamber=pSdig->C();x=pSdig->X();y=pSdig->Y();q=pSdig->Q();tr[0]=pSdig->T(0);id=pSdig->Id();
193         iNdigitsPerPad=1;tr[1]=tr[2]=kBad;
194       }
195     }//sdigits loop (sorted)
196   
197     if(SDigits()->GetEntries())AddDigit(chamber,x,y,(Int_t)q,tr[0],tr[1],tr[2]);//add the last digit
198         
199         
200     GetLoader()->TreeD()->Fill();  
201     GetLoader()->WriteDigits("OVERWRITE");
202     if(GetDebug()) Info("SDigits2Digits","Event %i processed.",iEventN);
203   }//events loop
204   GetLoader()->UnloadSDigits();  GetLoader()->UnloadDigits();  
205   ResetSDigits();                ResetDigitsOld();
206   if(GetDebug()) Info("SDigits2Digits","Stop.");
207 }//void AliRICH::SDigits2Digits()
208 //__________________________________________________________________________________________________
209 void AliRICH::Digits2Reco()
210 {//Generate clusters from digits then generate recos from clusters or digits
211   if(GetDebug()) Info("Digits2reco","Start.");
212
213 }//void AliRICH::Digits2Reco()  
214 //__________________________________________________________________________________________________
215 void AliRICH::BuildGeometry() 
216 {//Builds a TNode geometry for event display
217   if(GetDebug())Info("BuildGeometry","Start.");
218   
219   TNode *node, *subnode, *top;
220   top=gAlice->GetGeometry()->GetNode("alice");
221   
222   new TBRIK("S_RICH","S_RICH","void",71.09999,11.5,73.15);
223
224   Float_t wid=Param()->SectorSizeX();
225   Float_t len=Param()->SectorSizeY();
226   new TBRIK("PHOTO","PHOTO","void",wid/2,0.1,len/2);
227   
228   for(int i=1;i<=kNCH;i++){
229     top->cd();
230     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());
231     node->SetLineColor(kRed);
232     node->cd();
233     subnode = new TNode("PHOTO1","PHOTO1","PHOTO",wid+Param()->DeadZone(),5,len/2+Param()->DeadZone()/2,"");
234     subnode->SetLineColor(kGreen);
235     fNodes->Add(subnode);
236     subnode = new TNode("PHOTO1","PHOTO1","PHOTO",0,5,len/2+Param()->DeadZone()/2,"");
237     subnode->SetLineColor(kGreen);
238     fNodes->Add(subnode);
239     subnode = new TNode("PHOTO1","PHOTO1","PHOTO",-wid-Param()->DeadZone(),5,len/2+Param()->DeadZone()/2,"");
240     subnode->SetLineColor(kGreen);
241     fNodes->Add(subnode);
242     subnode = new TNode("PHOTO1","PHOTO1","PHOTO",wid+Param()->DeadZone(),5,-len/2-Param()->DeadZone()/2,"");
243     subnode->SetLineColor(kGreen);
244     fNodes->Add(subnode);
245     subnode = new TNode("PHOTO1","PHOTO1","PHOTO",0,5,-len/2 -Param()->DeadZone()/2,"");
246     subnode->SetLineColor(kGreen);
247     fNodes->Add(subnode);
248     subnode = new TNode("PHOTO1","PHOTO1","PHOTO",-wid-Param()->DeadZone(),5,-len/2 - Param()->DeadZone()/2,"");
249     subnode->SetLineColor(kGreen);
250     fNodes->Add(subnode);
251     fNodes->Add(node);
252   }  
253   if(GetDebug())Info("BuildGeometry","Stop.");    
254 }//void AliRICH::BuildGeometry()
255
256 static Int_t kCSI=6;
257 static Int_t kGAP=9;
258 //______________________________________________________________________________
259 void AliRICH::CreateMaterials()
260 {
261     //
262     // *** DEFINITION OF AVAILABLE RICH MATERIALS *** 
263     // ORIGIN    : NICK VAN EIJNDHOVEN 
264     // Modified by:  N. Colonna (INFN - BARI, Nicola.Colonna@ba.infn.it) 
265     //               R.A. Fini  (INFN - BARI, Rosanna.Fini@ba.infn.it) 
266     //               R.A. Loconsole (Bari University, loco@riscom.ba.infn.it) 
267     //
268     Int_t i;
269     
270     //Photons energy intervals
271     Float_t ppckov[26];
272     for (i=0;i<26;i++) 
273     {
274         ppckov[i] = (Float_t(i)*0.1+5.5)*1e-9;
275     }
276     
277     
278     //Refraction index for quarz
279     Float_t rIndexQuarz[26];
280     Float_t  e1= 10.666;
281     Float_t  e2= 18.125;
282     Float_t  f1= 46.411;
283     Float_t  f2= 228.71;
284     for (i=0;i<26;i++)
285     {
286         Float_t ene=ppckov[i]*1e9;
287         Float_t a=f1/(e1*e1 - ene*ene);
288         Float_t b=f2/(e2*e2 - ene*ene);
289         rIndexQuarz[i] = TMath::Sqrt(1. + a + b );
290     } 
291     
292     //Refraction index for opaque quarz, methane and grid
293     Float_t rIndexOpaqueQuarz[26];
294     Float_t rIndexMethane[26];
295     Float_t rIndexGrid[26];
296     for (i=0;i<26;i++)
297     {
298         rIndexOpaqueQuarz[i]=1;
299         rIndexMethane[i]=1.000444;
300         rIndexGrid[i]=1;
301     } 
302     
303     //Absorption index for freon
304     Float_t abscoFreon[26] = {179.0987, 179.0987, 179.0987, 179.0987, 179.0987,  179.0987, 179.0987, 179.0987, 
305                                179.0987, 142.9206, 56.64957, 25.58622, 13.95293, 12.03905, 10.42953, 8.804196, 
306                                7.069031, 4.461292, 2.028366, 1.293013, .577267,   .40746,  .334964, 0., 0., 0.};
307     
308
309     Float_t abscoQuarz [26] = {105.8, 65.52, 48.58, 42.85, 35.79, 31.262, 28.598, 27.527, 25.007, 22.815, 21.004,
310                                 19.266, 17.525, 15.878, 14.177, 11.719, 9.282, 6.62, 4.0925, 2.601, 1.149, .667, .3627,
311                                 .192, .1497, .10857};
312     
313     //Absorption index for methane
314     Float_t abscoMethane[26];
315     for (i=0;i<26;i++) 
316     {
317         abscoMethane[i]=AbsoCH4(ppckov[i]*1e9); 
318     }
319     
320     //Absorption index for opaque quarz, csi and grid, efficiency for all and grid
321     Float_t abscoOpaqueQuarz[26];
322     Float_t abscoCsI[26];
323     Float_t abscoGrid[26];
324     Float_t efficAll[26];
325     Float_t efficGrid[26];
326     for (i=0;i<26;i++)
327     { 
328         abscoOpaqueQuarz[i]=1e-5; 
329         abscoCsI[i]=1e-4; 
330         abscoGrid[i]=1e-4; 
331         efficAll[i]=1; 
332         efficGrid[i]=1;
333     } 
334     
335     //Efficiency for csi 
336     
337     Float_t efficCsI[26] = {0.000199999995, 0.000600000028, 0.000699999975, 0.00499999989, 0.00749999983, 0.010125,
338                              0.0242999997, 0.0405000001, 0.0688500032, 0.105299994, 0.121500008, 0.141749993, 0.157949999,
339                              0.162, 0.166050002, 0.167669997, 0.174299985, 0.176789999, 0.179279998, 0.182599992, 0.18592,
340                              0.187579989, 0.189239994, 0.190899998, 0.207499996, 0.215799987};
341         
342     
343
344     //FRESNEL LOSS CORRECTION FOR PERPENDICULAR INCIDENCE AND
345     //UNPOLARIZED PHOTONS
346
347     for (i=0;i<26;i++)
348     {
349         efficCsI[i] = efficCsI[i]/(1.-Fresnel(ppckov[i]*1e9,1.,0)); 
350     }
351         
352     /*******************************************End of rich_media.f***************************************/
353     
354   Float_t rIndexFreon[26];
355     
356     
357     // --- Photon energy (GeV) 
358     // --- Refraction indexes 
359     for (i = 0; i < 26; ++i) {
360       rIndexFreon[i] = ppckov[i] * .0172 * 1e9 + 1.177;
361       //rIndexFreon[i] = 1;
362     }
363             
364       
365   Float_t a=0,z=0,den=0,radl=0,absl=0;
366   Float_t tmaxfd=-10.0, deemax=-0.2, stemax=-0.1,epsil=0.001, stmin=-0.001; 
367   Int_t   isxfld = gAlice->Field()->Integ();
368   Float_t sxmgmx = gAlice->Field()->Max();
369     
370   AliMaterial( 1, "Air     $",a=14.61,z=7.3, den=0.001205,radl=30420.0,absl=67500);//(Air)
371   AliMedium(1, "DEFAULT MEDIUM AIR$", 1, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
372   
373   AliMaterial( 6, "HON",      a=12.01,z=6.0, den=0.1,     radl=18.8,   absl=0);    //(C)-equivalent radl
374   AliMedium(2, "HONEYCOMB$", 6, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
375   
376   AliMaterial(16, "CSI",      a=12.01,z=6.0, den=0.1,     radl=18.8,   absl=0);    //CsI-radl equivalent
377   AliMedium(kCSI, "CSI$", 16, 1, isxfld, sxmgmx,tmaxfd, stemax, deemax, epsil, stmin);
378   
379   AliMaterial(11, "GRI",      a=63.54,z=29.0,den=8.96,    radl=1.43,   absl=0);    //anode grid (Cu) 
380   AliMedium(7, "GRIGLIA$", 11, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
381   
382   AliMaterial(50, "ALUM",     a=26.98,z=13.0,den=2.7,     radl=8.9,    absl=0);    //aluminium sheet (Al)
383   AliMedium(10, "ALUMINUM$", 50, 1, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
384   
385   AliMaterial(31, "COPPER$",  a=63.54,z=29.0,den=8.96,    radl=1.4,    absl=0);    //(Cu)
386   AliMedium(12, "PCB_COPPER", 31, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
387   
388   Float_t  aQuartz[2]={28.09,16.0};  Float_t  zQuartz[2]={14.00, 8.0};  Float_t  wmatQuartz[2]={1,2};
389   AliMixture (20, "QUA",aQuartz,zQuartz,den=2.64,-2, wmatQuartz);//Quarz (SiO2) - trasnparent 
390   AliMedium(3, "QUARZO$", 20, 1, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
391   
392   AliMixture (21, "QUAO",aQuartz, zQuartz, den=2.64, -2, wmatQuartz);//Quarz (SiO2) - opaque
393   AliMedium(8, "QUARZOO$", 21, 1, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
394   
395   Float_t  aFreon[2]={12,19};  Float_t  zFreon[2]={6,9};  Float_t wmatFreon[2]={6,14};
396   AliMixture (30, "FRE",aFreon,zFreon,den=1.7,-2,wmatFreon);//Freon (C6F14) 
397   AliMedium(4, "FREON$", 30, 1, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
398   
399   Float_t aMethane[2]={12.01,1}; Float_t zMethane[2]={6,1}; Float_t wmatMethane[2]={1,4};
400   AliMixture (40, "MET", aMethane, zMethane, den=7.17e-4,-2, wmatMethane);//methane (CH4)     
401   AliMedium(5, "METANO$", 40, 1, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
402   
403   AliMixture (41, "METG", aMethane, zMethane, den=7.17e-4, -2, wmatMethane);
404   AliMedium(kGAP, "GAP$", 41, 1, isxfld, sxmgmx,tmaxfd, 0.1, -deemax, epsil, -stmin);
405   
406   Float_t aGlass[5]={12.01, 28.09, 16.,   10.8,  23.};
407   Float_t zGlass[5]={ 6.,   14.,    8.,    5.,   11.};
408   Float_t wGlass[5]={ 0.5,  0.105, 0.355, 0.03,  0.01};
409   AliMixture (32, "GLASS",aGlass, zGlass, den=1.74, 5, wGlass);//Glass 50%C+10.5%Si+35.5%O+3% + 1%
410   AliMedium(11, "GLASS", 32, 0, isxfld, sxmgmx, tmaxfd, stemax, deemax, epsil, stmin);
411             
412   Int_t *idtmed = fIdtmed->GetArray()-999;
413   gMC->SetCerenkov(idtmed[1000], 26, ppckov, abscoMethane,     efficAll,  rIndexMethane);
414   gMC->SetCerenkov(idtmed[1001], 26, ppckov, abscoMethane,     efficAll,  rIndexMethane);
415   gMC->SetCerenkov(idtmed[1002], 26, ppckov, abscoQuarz,       efficAll,  rIndexQuarz);
416   gMC->SetCerenkov(idtmed[1003], 26, ppckov, abscoFreon,       efficAll,  rIndexFreon);
417   gMC->SetCerenkov(idtmed[1004], 26, ppckov, abscoMethane,     efficAll,  rIndexMethane);
418   gMC->SetCerenkov(idtmed[1005], 26, ppckov, abscoCsI,         efficCsI,  rIndexMethane);
419   gMC->SetCerenkov(idtmed[1006], 26, ppckov, abscoGrid,        efficGrid, rIndexGrid);
420   gMC->SetCerenkov(idtmed[1007], 26, ppckov, abscoOpaqueQuarz, efficAll,  rIndexOpaqueQuarz);
421   gMC->SetCerenkov(idtmed[1008], 26, ppckov, abscoMethane,     efficAll,  rIndexMethane);
422   gMC->SetCerenkov(idtmed[1009], 26, ppckov, abscoGrid,        efficGrid, rIndexGrid);
423   gMC->SetCerenkov(idtmed[1010], 26, ppckov, abscoOpaqueQuarz, efficAll,  rIndexOpaqueQuarz);
424 }//void AliRICH::CreateMaterials()
425 //__________________________________________________________________________________________________
426 Float_t AliRICH::Fresnel(Float_t ene,Float_t pdoti, Bool_t pola)
427 {
428
429     //ENE(EV), PDOTI=COS(INC.ANG.), PDOTR=COS(POL.PLANE ROT.ANG.)
430     
431     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,
432                       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,
433                       7.8,7.9,8.0,8.1,8.2,8.3,8.4,8.5};
434     Float_t csin[36] = {2.14,2.21,2.33,2.48,2.76,2.97,2.99,2.59,2.81,3.05,
435                         2.86,2.53,2.55,2.66,2.79,2.96,3.18,3.05,2.84,2.81,2.38,2.11,
436                         2.01,2.13,2.39,2.73,3.08,3.15,2.95,2.73,2.56,2.41,2.12,1.95,
437                         1.72,1.53};
438     Float_t csik[36] = {0.,0.,0.,0.,0.,0.196,0.408,0.208,0.118,0.49,0.784,0.543,
439                         0.424,0.404,0.371,0.514,0.922,1.102,1.139,1.376,1.461,1.253,0.878,
440                         0.69,0.612,0.649,0.824,1.347,1.571,1.678,1.763,1.857,1.824,1.824,
441                         1.714,1.498};
442     Float_t xe=ene;
443     Int_t  j=Int_t(xe*10)-49;
444     Float_t cn=csin[j]+((csin[j+1]-csin[j])/0.1)*(xe-en[j]);
445     Float_t ck=csik[j]+((csik[j+1]-csik[j])/0.1)*(xe-en[j]);
446
447     //FORMULAE FROM HANDBOOK OF OPTICS, 33.23 OR
448     //W.R. HUNTER, J.O.S.A. 54 (1964),15 , J.O.S.A. 55(1965),1197
449
450     Float_t sinin=TMath::Sqrt(1-pdoti*pdoti);
451     Float_t tanin=sinin/pdoti;
452
453     Float_t c1=cn*cn-ck*ck-sinin*sinin;
454     Float_t c2=4*cn*cn*ck*ck;
455     Float_t aO=TMath::Sqrt(0.5*(TMath::Sqrt(c1*c1+c2)+c1));
456     Float_t b2=0.5*(TMath::Sqrt(c1*c1+c2)-c1);
457     
458     Float_t rs=((aO-pdoti)*(aO-pdoti)+b2)/((aO+pdoti)*(aO+pdoti)+b2);
459     Float_t rp=rs*((aO-sinin*tanin)*(aO-sinin*tanin)+b2)/((aO+sinin*tanin)*(aO+sinin*tanin)+b2);
460     
461
462     //CORRECTION FACTOR FOR SURFACE ROUGHNESS
463     //B.J. STAGG  APPLIED OPTICS, 30(1991),4113
464
465     Float_t sigraf=18.;
466     Float_t lamb=1240/ene;
467     Float_t fresn;
468  
469     Float_t  rO=TMath::Exp(-(4*TMath::Pi()*pdoti*sigraf/lamb)*(4*TMath::Pi()*pdoti*sigraf/lamb));
470
471     if(pola)
472     {
473         Float_t pdotr=0.8;                                 //DEGREE OF POLARIZATION : 1->P , -1->S
474         fresn=0.5*(rp*(1+pdotr)+rs*(1-pdotr));
475     }
476     else
477         fresn=0.5*(rp+rs);
478       
479     fresn = fresn*rO;
480     return(fresn);
481 }//Float_t AliRICH::Fresnel(Float_t ene,Float_t pdoti, Bool_t pola)
482 //__________________________________________________________________________________________________
483 Float_t AliRICH::AbsoCH4(Float_t x)
484 {
485
486     //KLOSCH,SCH4(9),WL(9),EM(9),ALENGTH(31)
487     Float_t sch4[9] = {.12,.16,.23,.38,.86,2.8,7.9,28.,80.};              //MB X 10^22
488     //Float_t wl[9] = {153.,152.,151.,150.,149.,148.,147.,146.,145};
489     Float_t em[9] = {8.1,8.158,8.212,8.267,8.322,8.378,8.435,8.493,8.55};
490     const Float_t kLosch=2.686763E19;                                      // LOSCHMIDT NUMBER IN CM-3
491     const Float_t kIgas1=100, kIgas2=0, kOxy=10., kWater=5., kPressure=750.,kTemperature=283.;                                      
492     Float_t pn=kPressure/760.;
493     Float_t tn=kTemperature/273.16;
494     
495         
496 // ------- METHANE CROSS SECTION -----------------
497 // ASTROPH. J. 214, L47 (1978)
498         
499     Float_t sm=0;
500     if (x<7.75) 
501         sm=.06e-22;
502     
503     if(x>=7.75 && x<=8.1)
504     {
505         Float_t c0=-1.655279e-1;
506         Float_t c1=6.307392e-2;
507         Float_t c2=-8.011441e-3;
508         Float_t c3=3.392126e-4;
509         sm=(c0+c1*x+c2*x*x+c3*x*x*x)*1.e-18;
510     }
511     
512     if (x> 8.1)
513     {
514         Int_t j=0;
515         while (x<=em[j] && x>=em[j+1])
516         {
517             j++;
518             Float_t a=(sch4[j+1]-sch4[j])/(em[j+1]-em[j]);
519             sm=(sch4[j]+a*(x-em[j]))*1e-22;
520         }
521     }
522     
523     Float_t dm=(kIgas1/100.)*(1.-((kOxy+kWater)/1.e6))*kLosch*pn/tn;
524     Float_t abslm=1./sm/dm;
525     
526 //    ------- ISOBUTHANE CROSS SECTION --------------
527 //     i-C4H10 (ai) abs. length from curves in
528 //     Lu-McDonald paper for BARI RICH workshop .
529 //     -----------------------------------------------------------
530     
531     Float_t ai;
532     Float_t absli;
533     if (kIgas2 != 0) 
534     {
535         if (x<7.25)
536             ai=100000000.;
537         
538         if(x>=7.25 && x<7.375)
539             ai=24.3;
540         
541         if(x>=7.375)
542             ai=.0000000001;
543         
544         Float_t si = 1./(ai*kLosch*273.16/293.);                    // ISOB. CRO.SEC.IN CM2
545         Float_t di=(kIgas2/100.)*(1.-((kOxy+kWater)/1.e6))*kLosch*pn/tn;
546         absli =1./si/di;
547     }
548     else
549         absli=1.e18;
550 //    ---------------------------------------------------------
551 //
552 //       transmission of O2
553 //
554 //       y= path in cm, x=energy in eV
555 //       so= cross section for UV absorption in cm2
556 //       do= O2 molecular density in cm-3
557 //    ---------------------------------------------------------
558     
559     Float_t abslo;
560     Float_t so=0;
561     if(x>=6.0)
562     {
563         if(x>=6.0 && x<6.5)
564         {
565             so=3.392709e-13 * TMath::Exp(2.864104 *x);
566             so=so*1e-18;
567         }
568         
569         if(x>=6.5 && x<7.0) 
570         {
571             so=2.910039e-34 * TMath::Exp(10.3337*x);
572             so=so*1e-18;
573         }
574             
575
576         if (x>=7.0) 
577         {
578             Float_t a0=-73770.76;
579             Float_t a1=46190.69;
580             Float_t a2=-11475.44;
581             Float_t a3=1412.611;
582             Float_t a4=-86.07027;
583             Float_t a5=2.074234;
584             so= a0+(a1*x)+(a2*x*x)+(a3*x*x*x)+(a4*x*x*x*x)+(a5*x*x*x*x*x);
585             so=so*1e-18;
586         }
587         
588         Float_t dox=(kOxy/1e6)*kLosch*pn/tn;
589         abslo=1./so/dox;
590     }
591     else
592         abslo=1.e18;
593 //     ---------------------------------------------------------
594 //
595 //       transmission of H2O
596 //
597 //       y= path in cm, x=energy in eV
598 //       sw= cross section for UV absorption in cm2
599 //       dw= H2O molecular density in cm-3
600 //     ---------------------------------------------------------
601     
602     Float_t abslw;
603     
604     Float_t b0=29231.65;
605     Float_t b1=-15807.74;
606     Float_t b2=3192.926;
607     Float_t b3=-285.4809;
608     Float_t b4=9.533944;
609     
610     if(x>6.75)
611     {    
612         Float_t sw= b0+(b1*x)+(b2*x*x)+(b3*x*x*x)+(b4*x*x*x*x);
613         sw=sw*1e-18;
614         Float_t dw=(kWater/1e6)*kLosch*pn/tn;
615         abslw=1./sw/dw;
616     }
617     else
618         abslw=1.e18;
619             
620 //    ---------------------------------------------------------
621     
622     Float_t alength=1./(1./abslm+1./absli+1./abslo+1./abslw);
623     return (alength);
624 }
625 //__________________________________________________________________________________________________
626 void AliRICH::MakeBranch(Option_t* option)
627 {//Create Tree branches for the RICH.
628   if(GetDebug())Info("MakeBranch","Start with option= %s.",option);
629     
630   const Int_t kBufferSize = 4000;
631       
632   const char *cH = strstr(option,"H");
633   const char *cD = strstr(option,"D");
634   const char *cR = strstr(option,"R");
635   const char *cS = strstr(option,"S");
636
637   if(cH&&TreeH()){//H
638     CreateHits();      //branch will be created in AliDetector::MakeBranch
639     CreateCerenkovsOld(); MakeBranchInTree(TreeH(),"RICHCerenkov", &fCerenkovs, kBufferSize,0);
640     CreateSpecialsOld();  MakeBranchInTree(TreeH(),"RICHSpecials", &fSpecials,kBufferSize,0); 
641   }//H     
642   AliDetector::MakeBranch(option);//this is after cH because we need to guarantee that fHits array is created
643       
644   if(cS&&fLoader->TreeS()){//S  
645     CreateSDigits();   MakeBranchInTree(fLoader->TreeS(),"RICH",&fSdigits,kBufferSize,0) ;
646   }//S
647    
648   if(cD&&fLoader->TreeD()){//D
649     CreateDigits();
650     CreateDigitsOld();  
651     for(int i=0;i<kNCH;i++){ 
652       MakeBranchInTree(fLoader->TreeD(),Form("%sDigits%d",GetName(),i+1),&((*fDchambers)[i]),kBufferSize,0);
653       MakeBranchInTree(fLoader->TreeD(),Form("%s%d",GetName(),i+1),&((*fDigitsNew)[i]),kBufferSize,0);
654     }
655   }//D
656   
657   if(cR&&fLoader->TreeR()){//R
658     CreateRawClustersOld(); 
659     for(int i=0; i<kNCH ;i++)
660       MakeBranchInTree(fLoader->TreeR(),Form("%sRawClusters%d",GetName(),i+1), &((*fRawClusters)[i]), kBufferSize, 0);
661    }//R
662   if(GetDebug())Info("MakeBranch","Stop.");   
663 }//void AliRICH::MakeBranch(Option_t* option)
664 //__________________________________________________________________________________________________
665 void AliRICH::SetTreeAddress()
666 {//Set branch address for the Hits and Digits Tree.
667   if(GetDebug())Info("SetTreeAddress","Start.");
668       
669   TBranch *branch;
670     
671   if(fLoader->TreeH()){//H
672     if(GetDebug())Info("SetTreeAddress","tree H is requested.");
673     CreateHits();//branch map will be in AliDetector::SetTreeAddress    
674     branch=fLoader->TreeH()->GetBranch("RICHCerenkov");   if(branch){CreateCerenkovsOld(); branch->SetAddress(&fCerenkovs);}       
675     branch=fLoader->TreeH()->GetBranch("RICHSpecials");   if(branch){CreateSpecialsOld();  branch->SetAddress(&fSpecials);}
676   }//H
677   AliDetector::SetTreeAddress();//this is after TreeH because we need to guarantee that fHits array is created
678
679   if(fLoader->TreeS()){//S
680     if(GetDebug())Info("SetTreeAddress","tree S is requested.");
681     branch=fLoader->TreeS()->GetBranch(GetName());        if(branch){CreateSDigits();   branch->SetAddress(&fSdigits);}
682   }//S
683     
684   if(fLoader->TreeD()){//D    
685     if(GetDebug())Info("SetTreeAddress","tree D is requested.");
686     for(int i=0;i<kNCH;i++){      
687       branch=fLoader->TreeD()->GetBranch(Form("%s%d",GetName(),i+1)); 
688       if(branch){CreateDigits(); branch->SetAddress(&((*fDigitsNew)[i]));}
689       
690       branch=fLoader->TreeD()->GetBranch(Form("%sDigits%d",GetName(),i+1)); 
691       if(branch){CreateDigitsOld(); branch->SetAddress(&((*fDchambers)[i]));}
692     }//for
693   }//D
694     
695   if(fLoader->TreeR()){//R
696     if(GetDebug())Info("SetTreeAddress","tree R is requested.");
697
698     for(int i=0;i<kNCH;i++){         
699       branch=fLoader->TreeR()->GetBranch(Form("%sClusters%d" ,GetName(),i+1));
700       if(branch){CreateClusters(); branch->SetAddress(&((*fRawClusters)[i]));}
701     }
702     
703     for(int i=0;i<kNCH;i++) {
704       branch=fLoader->TreeR()->GetBranch(Form("%sRawClusters%d" ,GetName(),i+1));
705       if(branch){CreateRawClustersOld(); branch->SetAddress(&((*fRawClusters)[i]));}
706     }
707   }//R
708   if(GetDebug())Info("SetTreeAddress","Stop.");
709 }//void AliRICH::SetTreeAddress()
710 //__________________________________________________________________________________________________
711 void AliRICH::Print(Option_t *option)const
712 {
713   TObject::Print(option);
714   Param()->Dump();
715   fChambers->Print(option);  
716 }//void AliRICH::Print(Option_t *option)const
717 //__________________________________________________________________________________________________
718 void AliRICH::CreateGeometry()
719 {//Creates detailed geometry simulation (currently GEANT volumes tree)         
720   if(GetDebug())Info("CreateGeometry","Start.");
721 //Opaque quartz thickness
722   Float_t oqua_thickness = .5;
723 //CsI dimensions
724   Float_t pcX=Param()->PcSizeX();
725   Float_t pcY=Param()->PcSizeY();
726   
727   Int_t *idtmed = fIdtmed->GetArray()-999;
728     
729   Int_t i;
730   Float_t zs;
731   Int_t idrotm[1099];
732   Float_t par[3];
733     
734 //External aluminium box 
735   par[0]=68.8*kcm;par[1]=13*kcm;par[2]=70.86*kcm;  gMC->Gsvolu("RICH", "BOX ", idtmed[1009], par, 3);
736 //Air 
737   par[0]=66.3;   par[1] = 13; par[2] = 68.35;      gMC->Gsvolu("SRIC", "BOX ", idtmed[1000], par, 3); 
738 //Air 2 (cutting the lower part of the box)
739   par[0]=1.25;    par[1] = 3;    par[2] = 70.86;   gMC->Gsvolu("AIR2", "BOX ", idtmed[1000], par, 3);
740 //Air 3 (cutting the lower part of the box)
741   par[0]=66.3;    par[1] = 3;  par[2] = 1.2505;    gMC->Gsvolu("AIR3", "BOX ", idtmed[1000], par, 3);
742 //Honeycomb 
743   par[0]=66.3;par[1]=0.188;  par[2] = 68.35;       gMC->Gsvolu("HONE", "BOX ", idtmed[1001], par, 3);
744 //Aluminium sheet 
745   par[0]=66.3;par[1]=0.025;par[2]=68.35;           gMC->Gsvolu("ALUM", "BOX ", idtmed[1009], par, 3);
746   //par[0] = 66.5; par[1] = .025; par[2] = 63.1;
747 //Quartz 
748   par[0]=Param()->QuartzWidth()/2;par[1]=Param()->QuartzThickness()/2;par[2]=Param()->QuartzLength()/2;
749   gMC->Gsvolu("QUAR", "BOX ", idtmed[1002], par, 3);
750 //Spacers (cylinders) 
751   par[0]=0.;par[1]=.5;par[2]=Param()->FreonThickness()/2;  gMC->Gsvolu("SPAC", "TUBE", idtmed[1002], par, 3);    
752 //Feet (freon slabs supports)
753   par[0] = .7;  par[1] = .3;  par[2] = 1.9;        gMC->Gsvolu("FOOT", "BOX", idtmed[1009], par, 3);
754 //Opaque quartz 
755   par[0]=Param()->QuartzWidth()/2;par[1]= .2;par[2]=Param()->QuartzLength()/2;
756   gMC->Gsvolu("OQUA", "BOX ", idtmed[1007], par, 3);
757 //Frame of opaque quartz
758   par[0]=Param()->OuterFreonWidth()/2;par[1]=Param()->FreonThickness()/2;par[2]=Param()->OuterFreonLength()/2; 
759   gMC->Gsvolu("OQF1", "BOX ", idtmed[1007], par, 3);
760   par[0]=Param()->InnerFreonWidth()/2;par[1]=Param()->FreonThickness()/2;par[2]=Param()->InnerFreonLength()/2; 
761   gMC->Gsvolu("OQF2", "BOX ", idtmed[1007], par, 3);
762 //Freon 
763   par[0]=Param()->OuterFreonWidth()/2 - oqua_thickness;
764   par[1]=Param()->FreonThickness()/2;
765   par[2]=Param()->OuterFreonLength()/2 - 2*oqua_thickness; 
766   gMC->Gsvolu("FRE1", "BOX ", idtmed[1003], par, 3);
767
768   par[0]=Param()->InnerFreonWidth()/2 - oqua_thickness;
769   par[1]=Param()->FreonThickness()/2;
770   par[2]=Param()->InnerFreonLength()/2 - 2*oqua_thickness; 
771   gMC->Gsvolu("FRE2", "BOX ", idtmed[1003], par, 3);    
772 //Methane 
773   par[0]=pcX/2;par[1]=Param()->GapThickness()/2;par[2]=pcY/2;         gMC->Gsvolu("META","BOX ",idtmed[1004], par, 3);
774 //Methane gap 
775   par[0]=pcX/2;par[1]=Param()->ProximityGapThickness()/2;par[2]=pcY/2;gMC->Gsvolu("GAP ","BOX ",(*fIdtmed)[kGAP],par,3);
776 //CsI PC
777   par[0]=pcX/2;par[1]=.25;par[2]=pcY/2;  gMC->Gsvolu("CSI ", "BOX ", (*fIdtmed)[kCSI], par, 3);
778 //Anode grid 
779   par[0] = 0.;par[1] = .001;par[2] = 20.;  gMC->Gsvolu("GRID", "TUBE", idtmed[1006], par, 3);
780
781 //Wire supports
782 //Bar of metal
783   par[0]=pcX/2;par[1]=1.05;par[2]=1.05;  gMC->Gsvolu("WSMe", "BOX ", idtmed[1009], par, 3);
784 //Ceramic pick up (base)
785   par[0]=pcX/2;par[1]= .25;par[2]=1.05;  gMC->Gsvolu("WSG1", "BOX ", idtmed[1010], par, 3);
786 //Ceramic pick up (head)
787   par[0] = pcX/2;par[1] = .1;par[2] = .1;  gMC->Gsvolu("WSG2", "BOX ", idtmed[1010], par, 3);
788
789 //Aluminium supports for methane and CsI
790 //Short bar
791   par[0]=pcX/2;par[1]=Param()->GapThickness()/2 + .25; par[2] = (68.35 - pcY/2)/2;
792   gMC->Gsvolu("SMSH", "BOX", idtmed[1009], par, 3);
793 //Long bar
794   par[0]=(66.3 - pcX/2)/2;par[1]=Param()->GapThickness()/2+.25;par[2]=pcY/2+68.35-pcY/2;
795   gMC->Gsvolu("SMLG", "BOX", idtmed[1009], par, 3);
796     
797 //Aluminium supports for freon
798 //Short bar
799   par[0] = Param()->QuartzWidth()/2; par[1] = .3; par[2] = (68.35 - Param()->QuartzLength()/2)/2;
800   gMC->Gsvolu("SFSH", "BOX", idtmed[1009], par, 3);    
801 //Long bar
802   par[0] = (66.3 - Param()->QuartzWidth()/2)/2; par[1] = .3;
803   par[2] = Param()->QuartzLength()/2 + 68.35 - Param()->QuartzLength()/2;
804   gMC->Gsvolu("SFLG", "BOX", idtmed[1009], par, 3);    
805 //PCB backplane
806   par[0] = pcX/2;par[1] = .25; par[2] = pcY/4 -.5025;  gMC->Gsvolu("PCB ", "BOX", idtmed[1011], par, 3);
807
808 //Backplane supports
809 //Aluminium slab
810   par[0] = 33.15;par[1] = 2;par[2] = 21.65;  gMC->Gsvolu("BACK", "BOX", idtmed[1009], par, 3);    
811 //Big hole
812   par[0] = 9.05; par[1] = 2; par[2] = 4.4625;  gMC->Gsvolu("BKHL", "BOX", idtmed[1000], par, 3);
813 //Small hole
814   par[0] = 5.7;par[1] = 2;par[2] = 4.4625;  gMC->Gsvolu("BKHS", "BOX", idtmed[1000], par, 3);
815 //Place holes inside backplane support
816   gMC->Gspos("BKHS", 1, "BACK", .8 + 5.7,0., .6 + 4.4625, 0, "ONLY");
817   gMC->Gspos("BKHS", 2, "BACK", -.8 - 5.7,0., .6 + 4.4625, 0, "ONLY");
818   gMC->Gspos("BKHS", 3, "BACK", .8 + 5.7,0., -.6 - 4.4625, 0, "ONLY");
819   gMC->Gspos("BKHS", 4, "BACK", -.8 - 5.7,0., -.6 - 4.4625, 0, "ONLY");
820   gMC->Gspos("BKHS", 5, "BACK", .8 + 5.7,0., .6 + 8.925 + 1.2 + 4.4625, 0, "ONLY");
821   gMC->Gspos("BKHS", 6, "BACK", -.8 - 5.7,0., .6 + 8.925 + 1.2 + 4.4625, 0, "ONLY");
822   gMC->Gspos("BKHS", 7, "BACK", .8 + 5.7,0., -.6 - 8.925 - 1.2 - 4.4625, 0, "ONLY");
823   gMC->Gspos("BKHS", 8, "BACK", -.8 - 5.7,0., -.6 - 8.925 - 1.2 - 4.4625, 0, "ONLY");
824   gMC->Gspos("BKHL", 1, "BACK", .8 + 11.4 + 1.6 + 9.05, 0., .6 + 4.4625, 0, "ONLY");
825   gMC->Gspos("BKHL", 2, "BACK", -.8 - 11.4 - 1.6 - 9.05, 0., .6 + 4.4625, 0, "ONLY");
826   gMC->Gspos("BKHL", 3, "BACK", .8 + 11.4 + 1.6 + 9.05, 0., -.6 - 4.4625, 0, "ONLY");
827   gMC->Gspos("BKHL", 4, "BACK", -.8 - 11.4 - 1.6 - 9.05, 0., -.6 - 4.4625, 0, "ONLY");
828   gMC->Gspos("BKHL", 5, "BACK", .8 + 11.4+ 1.6 + 9.05, 0., .6 + 8.925 + 1.2 + 4.4625, 0, "ONLY");
829   gMC->Gspos("BKHL", 6, "BACK", -.8 - 11.4 - 1.6 - 9.05, 0., .6 + 8.925 + 1.2 + 4.4625, 0, "ONLY");
830   gMC->Gspos("BKHL", 7, "BACK", .8 + 11.4 + 1.6 + 9.05, 0., -.6 - 8.925 - 1.2 - 4.4625, 0, "ONLY");
831   gMC->Gspos("BKHL", 8, "BACK", -.8 - 11.4 - 1.6 - 9.05, 0., -.6 - 8.925 - 1.2 - 4.4625, 0, "ONLY");
832 //Place material inside RICH 
833   gMC->Gspos("SRIC", 1, "RICH", 0.,0., 0., 0, "ONLY");
834   gMC->Gspos("AIR2", 1, "RICH", 66.3 + 1.2505, 1.276-Param()->GapThickness()/2-Param()->QuartzThickness()-Param()->FreonThickness()- .4 - .6 - .05 - .376 -.5 - 3.35, 0., 0, "ONLY");
835   gMC->Gspos("AIR2", 2, "RICH", -66.3 - 1.2505,1.276-Param()->GapThickness()/2-Param()->QuartzThickness()-Param()->FreonThickness()- .4 - .6 - .05 - .376 -.5 - 3.35, 0., 0, "ONLY");
836   gMC->Gspos("AIR3", 1, "RICH", 0., 1.276-Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .6 - .05 - .376 -.5 - 3.35, -68.35 - 1.25, 0, "ONLY");
837   gMC->Gspos("AIR3", 2, "RICH", 0., 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .6 - .05 - .376 -.5 - 3.35,  68.35 + 1.25, 0, "ONLY");
838   gMC->Gspos("ALUM", 1, "SRIC", 0., 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .6 - .05 - .376 -.025, 0., 0, "ONLY");
839   gMC->Gspos("HONE", 1, "SRIC", 0., 1.276- Param()->GapThickness()/2  - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .6 - .05 - .188, 0., 0, "ONLY");
840   gMC->Gspos("ALUM", 2, "SRIC", 0., 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .6 - .025, 0., 0, "ONLY");
841   gMC->Gspos("FOOT", 1, "SRIC", 64.95, 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .3, 36.9, 0, "ONLY");
842   gMC->Gspos("FOOT", 2, "SRIC", 21.65, 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .3 , 36.9, 0, "ONLY");
843   gMC->Gspos("FOOT", 3, "SRIC", -21.65, 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .3, 36.9, 0, "ONLY");
844   gMC->Gspos("FOOT", 4, "SRIC", -64.95, 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .3, 36.9, 0, "ONLY");
845   gMC->Gspos("FOOT", 5, "SRIC", 64.95, 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .3, -36.9, 0, "ONLY");
846   gMC->Gspos("FOOT", 6, "SRIC", 21.65, 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .3, -36.9, 0, "ONLY");
847   gMC->Gspos("FOOT", 7, "SRIC", -21.65, 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .3, -36.9, 0, "ONLY");
848   gMC->Gspos("FOOT", 8, "SRIC", -64.95, 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .4 - .3, -36.9, 0, "ONLY");
849   gMC->Gspos("OQUA", 1, "SRIC", 0., 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()- .2, 0., 0, "ONLY");
850 // Methane supports
851   gMC->Gspos("SMLG", 1, "SRIC", pcX/2 + (66.3 - pcX/2)/2, 1.276 + .25, 0., 0, "ONLY");
852   gMC->Gspos("SMLG", 2, "SRIC", - pcX/2 - (66.3 - pcX/2)/2, 1.276 + .25, 0., 0, "ONLY");
853   gMC->Gspos("SMSH", 1, "SRIC", 0., 1.276 + .25, pcY/2 + (68.35 - pcY/2)/2, 0, "ONLY");
854   gMC->Gspos("SMSH", 2, "SRIC", 0., 1.276 + .25, - pcY/2 - (68.35 - pcY/2)/2, 0, "ONLY");
855 //Freon supports
856   Float_t supp_y = 1.276 - Param()->GapThickness()/2- Param()->QuartzThickness() -Param()->FreonThickness() - .2 + .3; //y position of freon supports
857   gMC->Gspos("SFLG", 1, "SRIC", Param()->QuartzWidth()/2 + (66.3 - Param()->QuartzWidth()/2)/2, supp_y, 0., 0, "ONLY");
858   gMC->Gspos("SFLG", 2, "SRIC", - Param()->QuartzWidth()/2 - (66.3 - Param()->QuartzWidth()/2)/2, supp_y, 0., 0, "ONLY");
859   gMC->Gspos("SFSH", 1, "SRIC", 0., supp_y, Param()->QuartzLength()/2 + (68.35 - Param()->QuartzLength()/2)/2, 0, "ONLY");
860   gMC->Gspos("SFSH", 2, "SRIC", 0., supp_y, - Param()->QuartzLength()/2 - (68.35 - Param()->QuartzLength()/2)/2, 0, "ONLY");
861   AliMatrix(idrotm[1019], 0., 0., 90., 0., 90., 90.);
862 //Place spacers
863   Int_t nspacers = 30;
864   for (i = 0; i < nspacers/3; i++) {
865     zs = -11.6/2 + (TMath::Abs(nspacers/6) - i) * 12.2;
866     gMC->Gspos("SPAC", i, "FRE1", 10.5, 0., zs, idrotm[1019], "ONLY");  //Original settings 
867   }
868   for (i = nspacers/3; i < (nspacers*2)/3; i++) {
869     zs = -11.6/2 + (nspacers/3 + TMath::Abs(nspacers/6) - i) * 12.2;
870     gMC->Gspos("SPAC", i, "FRE1", 0, 0., zs, idrotm[1019], "ONLY");  //Original settings 
871   }
872   for (i = (nspacers*2)/3; i < nspacers; ++i) {
873     zs = -11.6/2 + ((nspacers*2)/3 + TMath::Abs(nspacers/6) - i) * 12.2;
874     gMC->Gspos("SPAC", i, "FRE1", -10.5, 0., zs, idrotm[1019], "ONLY"); //Original settings  
875   }
876   for (i = 0; i < nspacers/3; i++) {
877     zs = -11.6/2 + (TMath::Abs(nspacers/6) - i) * 12.2;
878     gMC->Gspos("SPAC", i, "FRE2", 10.5, 0., zs, idrotm[1019], "ONLY");  //Original settings 
879   }
880   for (i = nspacers/3; i < (nspacers*2)/3; i++) {
881     zs = -11.6/2 + (nspacers/3 + TMath::Abs(nspacers/6) - i) * 12.2;
882     gMC->Gspos("SPAC", i, "FRE2", 0, 0., zs, idrotm[1019], "ONLY");  //Original settings 
883   }
884   for (i = (nspacers*2)/3; i < nspacers; ++i) {
885     zs = -11.6/2 + ((nspacers*2)/3 + TMath::Abs(nspacers/6) - i) * 12.2;
886     gMC->Gspos("SPAC", i, "FRE2", -10.5, 0., zs, idrotm[1019], "ONLY"); //Original settings  
887   }
888   gMC->Gspos("FRE1", 1, "OQF1", 0., 0., 0., 0, "ONLY");
889   gMC->Gspos("FRE2", 1, "OQF2", 0., 0., 0., 0, "ONLY");
890   gMC->Gspos("OQF1", 1, "SRIC", Param()->OuterFreonWidth()/2 + Param()->InnerFreonWidth()/2 + 2, 1.276 - Param()->GapThickness()/2- Param()->QuartzThickness() -Param()->FreonThickness()/2, 0., 0, "ONLY"); //Original settings (31.3)
891   gMC->Gspos("OQF2", 2, "SRIC", 0., 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()/2, 0., 0, "ONLY");          //Original settings 
892   gMC->Gspos("OQF1", 3, "SRIC", - (Param()->OuterFreonWidth()/2 + Param()->InnerFreonWidth()/2) - 2, 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness() - Param()->FreonThickness()/2, 0., 0, "ONLY");       //Original settings (-31.3)
893   gMC->Gspos("QUAR", 1, "SRIC", 0., 1.276 - Param()->GapThickness()/2 - Param()->QuartzThickness()/2, 0., 0, "ONLY");
894   gMC->Gspos("GAP ", 1, "META", 0., Param()->GapThickness()/2 - Param()->ProximityGapThickness()/2 - 0.0001, 0., 0, "ONLY");
895   gMC->Gspos("META", 1, "SRIC", 0., 1.276, 0., 0, "ONLY");
896   gMC->Gspos("CSI ", 1, "SRIC", 0., 1.276 + Param()->GapThickness()/2 + .25, 0., 0, "ONLY");
897 //Wire support placing
898   gMC->Gspos("WSG2", 1, "GAP ", 0., Param()->ProximityGapThickness()/2 - .1, 0., 0, "ONLY");
899   gMC->Gspos("WSG1", 1, "CSI ", 0., 0., 0., 0, "ONLY");
900   gMC->Gspos("WSMe", 1, "SRIC ", 0., 1.276 + Param()->GapThickness()/2 + .5 + 1.05, 0., 0, "ONLY");
901 //Backplane placing
902   gMC->Gspos("BACK", 1, "SRIC ", -33.15, 1.276 + Param()->GapThickness()/2 + .5 + 2.1 + 2, 43.3, 0, "ONLY");
903   gMC->Gspos("BACK", 2, "SRIC ", 33.15, 1.276 + Param()->GapThickness()/2 + .5 + 2.1 + 2 , 43.3, 0, "ONLY");
904   gMC->Gspos("BACK", 3, "SRIC ", -33.15, 1.276 + Param()->GapThickness()/2 + .5 + 2.1 + 2, 0., 0, "ONLY");
905   gMC->Gspos("BACK", 4, "SRIC ", 33.15, 1.276 + Param()->GapThickness()/2 + .5 + 2.1 + 2, 0., 0, "ONLY");
906   gMC->Gspos("BACK", 5, "SRIC ", 33.15, 1.276 + Param()->GapThickness()/2 + .5 + 2.1 + 2, -43.3, 0, "ONLY");
907   gMC->Gspos("BACK", 6, "SRIC ", -33.15, 1.276 + Param()->GapThickness()/2 + .5 + 2.1 + 2, -43.3, 0, "ONLY");
908 //PCB placing
909   gMC->Gspos("PCB ", 1, "SRIC ", 0.,  1.276 + Param()->GapThickness()/2 + .5 + 1.05, pcX/4 + .5025 + 2.5, 0, "ONLY");
910   gMC->Gspos("PCB ", 2, "SRIC ", 0.,  1.276 + Param()->GapThickness()/2 + .5 + 1.05, -pcX/4 - .5025 - 2.5, 0, "ONLY");
911
912 //place chambers into mother volume ALIC
913   for(int i=1;i<=kNCH;i++){
914     AliMatrix(idrotm[1000+i],C(i)->ThetaXd(),C(i)->PhiXd(),
915                              C(i)->ThetaYd(),C(i)->PhiYd(),
916                              C(i)->ThetaZd(),C(i)->PhiZd());
917     gMC->Gspos("RICH",i,"ALIC",C(i)->X(),C(i)->Y(),C(i)->Z(),idrotm[1000+i], "ONLY");
918   }
919
920   if(GetDebug())Info("CreateGeometry","Stop.");  
921 }//void AliRICH::CreateGeometry()
922 //__________________________________________________________________________________________________
923 void AliRICH::CreateChambers()
924 {//create all RICH Chambers on each call. Previous chambers deleted
925   if(fChambers) delete fChambers;
926   if(GetDebug())Info("CreateChambers","Creating RICH chambers.");
927   fChambers=new TObjArray(kNCH);
928   fChambers->SetOwner();
929   for(int i=0;i<kNCH;i++)  fChambers->AddAt(new AliRICHChamber(i+1,Param()),i);  
930 }//void AliRICH::CreateChambers()
931 //__________________________________________________________________________________________________
932 void AliRICH::GenerateFeedbacks(Int_t iChamber,Float_t eloss)
933 {// Generate FeedBack photons
934   Int_t j;
935   Float_t cthf, phif, enfp = 0, sthf;
936   Float_t e1[3], e2[3], e3[3];
937   Float_t vmod, uswop;
938   Float_t dir[3], phi;
939   Float_t pol[3], mom[4];
940 //Determine number of feedback photons
941   TLorentzVector globX4;
942   gMC->TrackPosition(globX4);  
943   Int_t sector;
944   Int_t iTotQdc=Param()->Loc2TotQdc(C(iChamber)->Glob2Loc(globX4),eloss,gMC->TrackPid(),sector);
945   Int_t iNphotons=gMC->GetRandom()->Poisson(Param()->AlphaFeedback(sector)*iTotQdc);    
946   Info("GenerateFeedbacks","N photons=%i",iNphotons);
947 //Generate photons
948   for(Int_t i=0;i<iNphotons;i++){
949     Double_t ranf[2];
950     gMC->GetRandom()->RndmArray(2,ranf);    //Sample direction
951     cthf=ranf[0]*2-1.0;
952     if(cthf<0) continue;
953     sthf = TMath::Sqrt((1 - cthf) * (1 + cthf));
954     phif = ranf[1] * 2 * TMath::Pi();
955     
956     if(Double_t randomNumber=gMC->GetRandom()->Rndm()<=0.57)
957       enfp = 7.5e-9;
958     else if(randomNumber<=0.7)
959       enfp = 6.4e-9;
960     else
961       enfp = 7.9e-9;
962     
963
964     dir[0] = sthf * TMath::Sin(phif);    dir[1] = cthf;    dir[2] = sthf * TMath::Cos(phif);
965     gMC->Gdtom(dir, mom, 2);
966     mom[0]*=enfp;    mom[1]*=enfp;    mom[2]*=enfp;
967     mom[3] = TMath::Sqrt(mom[0]*mom[0]+mom[1]*mom[1]+mom[2]*mom[2]);
968     
969     // Polarisation
970     e1[0]=      0;    e1[1]=-dir[2];    e1[2]= dir[1];
971     e2[0]=-dir[1];    e2[1]= dir[0];    e2[2]=      0;
972     e3[0]= dir[1];    e3[1]=      0;    e3[2]=-dir[0];
973     
974     vmod=0;
975     for(j=0;j<3;j++) vmod+=e1[j]*e1[j];
976     if (!vmod) for(j=0;j<3;j++) {
977       uswop=e1[j];
978       e1[j]=e3[j];
979       e3[j]=uswop;
980     }
981     vmod=0;
982     for(j=0;j<3;j++) vmod+=e2[j]*e2[j];
983     if (!vmod) for(j=0;j<3;j++) {
984       uswop=e2[j];
985       e2[j]=e3[j];
986       e3[j]=uswop;
987     }
988     
989     vmod=0;
990     for(j=0;j<3;j++) vmod+=e1[j]*e1[j];
991     vmod=TMath::Sqrt(1/vmod);
992     for(j=0;j<3;j++) e1[j]*=vmod;
993     
994     vmod=0;
995     for(j=0;j<3;j++) vmod+=e2[j]*e2[j];
996     vmod=TMath::Sqrt(1/vmod);
997     for(j=0;j<3;j++) e2[j]*=vmod;
998     
999     phi = gMC->GetRandom()->Rndm()* 2 * TMath::Pi();
1000     for(j=0;j<3;j++) pol[j]=e1[j]*TMath::Sin(phi)+e2[j]*TMath::Cos(phi);
1001     gMC->Gdtom(pol, pol, 2);
1002     Int_t outputNtracksStored;    
1003     gAlice->GetMCApp()->PushTrack(1,                 //do not transport
1004                      gAlice->GetMCApp()->GetCurrentTrackNumber(),//parent track 
1005                      kFeedback,                      //PID
1006                      mom[0],mom[1],mom[2],mom[3],    //track momentum  
1007                      globX4.X(),globX4.Y(),globX4.Z(),globX4.T(),    //track origin 
1008                      pol[0],pol[1],pol[2],           //polarization
1009                      kPFeedBackPhoton,outputNtracksStored,1.0);
1010     
1011   }
1012 }//FeedBackPhotons()
1013 //__________________________________________________________________________________________________