Removal of AliMCQA and of TreeH method on AliDetector
[u/mrichter/AliRoot.git] / VZERO / AliVZEROv4.cxx
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15
16 /* $Id$ */
17
18 //////////////////////////////////////////////////////////////////////
19 //                                                                  //
20 //  (V-zero) detector  version 4  as designed by the Lyon group     //
21 //   All comments should be sent to Brigitte CHEYNIS :              //
22 //                                  b.cheynis@ipnl.in2p3.fr         // 
23 //   Geometry of the   24th of february 2004                        //
24 //  (now 4 rings instead of 3 rings as in previous version)         // 
25 //   V0R (now V0C) sits between Z values  -89.4 and  -84.9 cm       //
26 //   V0L (now V0A) sits between Z values +350.0 and +352.0 cm       //
27 //   New coordinate system has been implemented in october 2003     //
28 //                                                                  //
29 //////////////////////////////////////////////////////////////////////
30
31 // --- Standard libraries ---
32 #include <Riostream.h>
33 #include <stdlib.h>
34 #include <string.h>
35
36 // --- ROOT libraries ---
37 #include <TClonesArray.h>
38 #include <TGeometry.h>
39 #include <TLorentzVector.h>
40 #include <TMath.h>
41 #include <TNode.h>
42 #include <TObjectTable.h>
43 #include <TTUBE.h>
44 #include <TTUBS.h>
45 #include <TVirtualMC.h>
46 #include <TParticle.h>
47
48 // --- AliRoot header files ---
49 #include "AliRun.h"
50 #include "AliMC.h"
51 #include "AliConst.h"
52 #include "AliLog.h"
53 #include "AliMagF.h"
54 #include "AliVZEROLoader.h"
55 #include "AliVZEROdigit.h"
56 #include "AliVZEROhit.h"
57 #include "AliVZEROv4.h"
58  
59 ClassImp(AliVZEROv4)
60
61 //_____________________________________________________________________________
62 AliVZEROv4:: AliVZEROv4():AliVZERO(),
63    fCellId(0),
64    fTrackPosition(),
65    fTrackMomentum(), 
66    fLightYield(93.75),
67    fLightAttenuation(0.05),
68    fnMeters(15.0),
69    fFibToPhot(0.3)
70    
71 {
72 // Standard default constructor 
73 }
74
75 //_____________________________________________________________________________
76 AliVZEROv4::AliVZEROv4(const char *name, const char *title):
77    AliVZERO(name,title),
78    fCellId(0),
79    fTrackPosition(),
80    fTrackMomentum(),
81    fLightYield(93.75),
82    fLightAttenuation(0.05),
83    fnMeters(15.0),
84    fFibToPhot(0.3)
85    
86 {
87
88 // Standard constructor for V-zero Detector  version 2
89
90   AliDebug(2,"Create VZERO object");
91 //       
92 //   fLightYield              =  93.75; // Light yield in BC408 (93.75 eV per photon)
93 //   fLightAttenuation        =   0.05; // Light attenuation in fiber (0.05 per meter)
94 //   fnMeters                 =   15.0; // Number of meters of clear fibers to PM
95 //   fFibToPhot               =    0.3; // Attenuation at fiber-photocathode interface
96 }
97
98 //_____________________________________________________________________________
99 void AliVZEROv4::CreateGeometry()
100 {
101
102 // Creates the GEANT geometry of the V-zero Detector  version 3
103   
104   AliDebug(2,"Create VZERO Geometry ");
105       
106   Int_t    *idtmed = fIdtmed->GetArray()-2999;
107
108   Int_t    ndetR = 1;
109   Int_t    ndetL = 1;
110  
111   Int_t    ncellsR = 1;
112   Int_t    ncellsL = 1;
113   
114   Int_t    idrotm[999];
115  
116   Float_t  height1Right, height2Right, height3Right, height4Right; 
117   Float_t  heightRight;
118   Float_t  theta;  
119   
120   Float_t  halfThickQua;
121   
122   Float_t  zdet;
123   Float_t  r0Right, r4Right;
124   Float_t  pi = TMath::Pi();
125     
126   height1Right    =     3.42;  // height of cell 1, in cm
127   height2Right    =     6.78;  // height of cell 2, in cm
128   height3Right    =     7.11;  // height of cell 3, in cm
129   height4Right    =    10.91;  // height of cell 4, in cm
130   
131   theta       = pi/6.0/2.0;       // half angular opening = 15 degrees
132     
133   halfThickQua= fThickness1/2.0;  // half thickness of elementary cell (inner ring)
134   
135 // distance 0.6 cm in zdet accounts for the fact V0R box back lid sits 0.6 away from 
136 // absorber nose sitting at 90 cm. Will use -zdet later...
137 // size of V0R box  (fThickness) is increased by 1 mm as compared to version v2 
138
139   fThickness  =    fThickness + 0.1;  
140   zdet        =    90.0 - 0.6 - fThickness/2.0;  // distance to vertex (along Z axis)   
141   r0Right     =    4.05;          // closest distance to center of the beam pipe
142   heightRight =    height1Right + height2Right + height3Right + height4Right;
143   r4Right     =    r0Right + heightRight;
144
145 // Creation of mother volume v0LE - left part - :
146 // Entrance face at  +350.0 cm  (new coordinate system) ...
147
148    Float_t   partube[3];
149    
150    partube[0] =  4.3;
151    partube[1] = 45.0;
152    partube[2] = fThickness1/2.0;   
153     
154    gMC->Gsvolu("V0LE","TUBE",idtmed[3005],partube,3);
155      
156 // Creation of five rings - left part - :
157 // Entrance face at +350.0 cm  (new coordinate system) ... 
158
159 // Mother volume v0L0 in which will be set 5 scintillator cells 
160
161   Float_t   partubs[5];  
162     
163   Float_t   r0Left      =   4.3;   
164   Float_t   height1Left =   3.6;  
165   Float_t   height2Left =   6.4;  
166   Float_t   height3Left =  14.9; 
167   Float_t   height4Left =  14.4;  
168   Float_t   heightLeft  =   height1Left + height2Left + height3Left + height4Left; 
169                                       
170   Float_t   r4Left      =   r0Left  + heightLeft; 
171   
172   partubs[0]     =  r0Left;
173   partubs[1]     =  r4Left;
174   partubs[2]     =  fThickness1/2.0;
175   partubs[3]     =  90.0-15.0;
176   partubs[4]     = 120.0-15.0;
177
178   gMC->Gsvolu("V0L0","TUBS",idtmed[3010],partubs,5);  // air volume
179   
180   Float_t  r1Left =  r0Left + height1Left;        
181      
182   partubs[0]     =  r0Left;
183   partubs[1]     =  r1Left;
184
185   gMC->Gsvolu("V0L1","TUBS",idtmed[3005],partubs,5);  // quartz volume
186   gMC->Gspos("V0L1",1,"V0L0", 0.0, 0.0 , 0.0, 0,"ONLY"); 
187
188   Float_t  r2Left  =  r1Left + height2Left;       
189   
190   partubs[0]     =  r1Left;
191   partubs[1]     =  r2Left;
192
193   gMC->Gsvolu("V0L2","TUBS",idtmed[3005],partubs,5);  // quartz volume
194   gMC->Gspos("V0L2",1,"V0L0", 0.0, 0.0 , 0.0, 0,"ONLY"); 
195   
196   Float_t  r3Left  =  r2Left + height3Left;       
197       
198   partubs[0]     =  r2Left;
199   partubs[1]     =  r3Left;
200
201   gMC->Gsvolu("V0L3","TUBS",idtmed[3005],partubs,5);  // quartz volume
202   gMC->Gspos("V0L3",1,"V0L0", 0.0, 0.0 , 0.0, 0,"ONLY");
203
204   partubs[0]     =  r3Left;
205   partubs[1]     =  r4Left;
206
207   gMC->Gsvolu("V0L4","TUBS",idtmed[3005],partubs,5);  // quartz volume
208   gMC->Gspos("V0L4",1,"V0L0", 0.0, 0.0 , 0.0, 0,"ONLY");  
209
210 // Creation of mother volume v0RI - right part - :
211   
212   partube[0] = r0Right - 0.2;
213   partube[1] = r4Right + 1.0;
214   partube[2] = fThickness/2.0; 
215       
216   gMC->Gsvolu("V0RI","TUBE",idtmed[3010],partube,3);
217   
218 // Creation of  carbon lids (3.5 mm thick) to keep v0RI box shut...
219
220   Float_t  lidThickness = 0.35;
221  
222   partube[0] =   r0Right;
223   partube[1] =   r4Right;
224   partube[2] =   +lidThickness/2.0;
225     
226   gMC->Gsvolu("V0CA","TUBE",idtmed[3001],partube,3); 
227   gMC->Gspos("V0CA",1,"V0RI",0.0,0.0, fThickness/2.0-partube[2],0,"ONLY");
228   gMC->Gspos("V0CA",2,"V0RI",0.0,0.0,-fThickness/2.0+partube[2],0,"ONLY");
229   
230 // Creation of aluminum rings to maintain the v0RI pieces ...
231
232   partube[0] =   r0Right - 0.2;
233   partube[1] =   r0Right;
234   partube[2] =   +fThickness/2.0;
235    
236   gMC->Gsvolu("V0IR","TUBE",idtmed[3003],partube,3);    
237   gMC->Gspos("V0IR",1,"V0RI",0.0,0.0,0.0,0,"ONLY");
238
239   partube[0] =   r4Right;
240   partube[1] =   r4Right + 1.0;
241   partube[2] =   +fThickness/2.0;
242  
243   gMC->Gsvolu("V0ER","TUBE",idtmed[3003],partube,3);    
244   gMC->Gspos("V0ER",1,"V0RI",0.0,0.0,0.0,0,"ONLY");
245   
246 // Mother volume v0R0 in which will be set 4  scintillator cells 
247   
248   partubs[0]      =  r0Right;
249   partubs[1]      =  r4Right;
250   partubs[2]      =  fThickness/2.0;
251   partubs[3]      =  90.0-15.0;
252   partubs[4]      = 120.0-15.0;
253
254   gMC->Gsvolu("V0R0","TUBS",idtmed[3010],partubs,5);  // air volume 
255
256 // Elementary cell of ring 1 :
257 // (cells of ring 1  will be shifted by 1.7 cm towards vertex to output fibers) 
258    
259   Float_t   offsetFibers  =  1.7;
260   Float_t   offset        =  fThickness/2.0 - lidThickness - fThickness1/2.0; 
261   Float_t   r1Right       =  r0Right + height1Right;
262       
263   partubs[0]     =  r0Right;
264   partubs[1]     =  r1Right;
265   partubs[2]     =  fThickness1/2.0;
266   
267   gMC->Gsvolu("V0R1","TUBS",idtmed[3005],partubs,5);  // scintillator volume
268   gMC->Gspos("V0R1",1,"V0R0", 0.0, 0.0 , -offset + offsetFibers, 0,"ONLY"); 
269
270 // Elementary cell of ring 2 :
271
272   Float_t   r2Right   =  r1Right + height2Right;       
273   
274   partubs[0]     =  r1Right;
275   partubs[1]     =  r2Right;
276
277   gMC->Gsvolu("V0R2","TUBS",idtmed[3005],partubs,5);  // scintillator volume
278   gMC->Gspos("V0R2",1,"V0R0", 0.0, 0.0 , -offset, 0,"ONLY"); 
279
280
281 // Elementary cell of ring 3 :
282
283   Float_t   r3Right   =  r2Right + height3Right;   
284      
285   partubs[0]     =  r2Right;
286   partubs[1]     =  r3Right;
287
288   gMC->Gsvolu("V0R3","TUBS",idtmed[3005],partubs,5);  // scintillator volume
289   gMC->Gspos("V0R3",1,"V0R0", 0.0, 0.0 , -offset, 0,"ONLY");
290
291 // Elementary cell of ring 4 :
292    
293   partubs[0]     =  r3Right;
294   partubs[1]     =  r4Right;
295
296   gMC->Gsvolu("V0R4","TUBS",idtmed[3005],partubs,5);  // scintillator volume
297   gMC->Gspos("V0R4",1,"V0R0", 0.0, 0.0 , -offset, 0,"ONLY");
298
299   Float_t  phiDeg = 180./6.; 
300
301 // Right part : 
302  
303   for(Float_t  phi = 15.0 ; phi < 360.0; phi = phi + phiDeg)
304       {        
305         AliMatrix(idrotm[902], 90.0, phi, 90.0, 90.0 +phi, 0.0 , 0.0);
306         gMC->Gspos("V0R0",ndetR,"V0RI",0.0,
307                           0.0,0.0,idrotm[902],"ONLY");
308         ndetR++;
309        }
310
311   gMC->Gspos("V0RI",1,"ALIC",0.0,0.0,-zdet,0,"ONLY");
312  
313   ncellsR = (ndetR - 1) * 4;  
314   AliInfo(Form("Number of cells on Right side =   %d",  ncellsR));    
315
316 // Left part :
317   
318   for(Float_t  phi = 15.0 ; phi < 360.0; phi = phi + phiDeg)
319       {       
320         AliMatrix(idrotm[902], 90.0, phi, 90.0, 90.0 +phi, 0.0 , 0.0);
321         gMC->Gspos("V0L0",ndetL,"V0LE",0.0,
322                           0.0,0.0,idrotm[902],"ONLY");
323         ndetL++;
324        }
325
326   gMC->Gspos("V0LE",1,"ALIC",0.0,0.0,350.0+fThickness1/2.0,0,"ONLY");
327  
328   ncellsL = (ndetL - 1) * 4;
329   AliInfo(Form("Number of cells on Left side  =   %d",  ncellsL));    
330            
331 }            
332     
333 //_____________________________________________________________________________
334 void AliVZEROv4::CreateMaterials()
335 {
336
337 // Creates materials used for geometry 
338
339     AliDebug(2,"VZERO create materials");
340     
341 /*
342     Float_t ppckov[14] = { 5.5e-9, 5.7e-9, 5.9e-9, 6.1e-9, 6.3e-9, 6.5e-9, 6.7e-9, 
343                            6.9e-9, 7.1e-9, 7.3e-9, 7.5e-9, 7.7e-9, 7.9e-9, 8.1e-9 };
344
345            
346     Float_t ppckov_alu[14] = { 5.5e-9, 5.7e-9, 5.9e-9, 6.1e-9, 6.3e-9, 6.5e-9, 6.7e-9, 
347                                6.9e-9, 7.1e-9, 7.3e-9, 7.5e-9, 7.7e-9, 7.9e-9, 8.1e-9 };
348                            
349     Float_t rindex_quarz[14] = { 1.52398,  1.53090, 1.53835, 1.54641, 1.55513, 1.56458, 
350                                  1.57488,  1.58611, 1.59842, 1.61197, 1.62696, 1.64362, 
351                                  1.662295, 1.68337 };
352                                  
353     Float_t absco_quarz[14] = { 105.8,  45.656, 35.665, 28.598, 25.007, 21.04, 17.525, 
354                                 14.177, 9.282, 4.0925, 1.149, 0.3627, 0.1497, 0.05 };   
355                                                                                         
356     Float_t effic_all[14]   = { 1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1. };
357     
358         
359     Float_t rindex_alu[14] = { 1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1. }; 
360     
361     
362     Float_t absco_alu[14]  = { 1e-4,1e-4,1e-4,1e-4,1e-4,1e-4,1e-4,1e-4,1e-4,1e-4,
363                                1e-4,1e-4,1e-4,1e-4 };
364     Float_t effic_alu[14]  = { 1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1. };
365
366 */        
367
368     Int_t *idtmed = fIdtmed->GetArray()-2999;
369     
370     
371 //  Parameters related to Quarz (SiO2) :
372  
373     Float_t aqua[2], zqua[2], densqua, wmatqua[2];
374     Int_t nlmatqua;
375     
376     aqua[0]    = 28.09;
377     aqua[1]    = 16.;
378     zqua[0]    = 14.;
379     zqua[1]    = 8.;
380     densqua    = 2.64;
381     nlmatqua   = -2;
382     wmatqua[0] = 1.;
383     wmatqua[1] = 2.;
384
385 // Parameters  related to aluminum sheets :
386     
387     Float_t  aal   = 26.98;
388     Float_t  zal   = 13.00; 
389     Float_t  densal=   2.7; 
390     Float_t  radlal=   8.9;
391        
392 // Parameters  related to scintillator CH :
393     
394     Float_t ascin[2] = {1.00794,12.011};
395     Float_t zscin[2] = {1.,6.};
396     Float_t wscin[2] = {1.,1.};
397     Float_t denscin  = 1.032;
398     
399 // AIR
400
401     Float_t aAir[4]={12.,14.,16.,36.};
402     Float_t zAir[4]={6.,7.,8.,18.};
403     Float_t wAir[4]={0.000124,0.755267,0.231781,0.012827};
404     Float_t dAir = 1.20479E-3;
405     
406 //  Definition of materials :
407
408 // AIR
409
410     AliMixture( 1, "AIR A$", aAir,zAir,dAir,4,wAir);
411     AliMixture(11, "AIR I$", aAir,zAir,dAir,4,wAir);
412     AliMaterial( 2, "CARBON$"  , 12.01, 6.0, 2.265, 18.8, 49.9, 0, 0);
413     AliMixture(  3, "QUA", aqua, zqua, densqua, nlmatqua, wmatqua);
414     AliMaterial( 4, "ALUMINIUM1$", 26.98, 13., 2.7, 8.9, 37.2, 0, 0);
415     AliMaterial( 5, "ALUMINIUM2$", aal, zal, densal, radlal, 0, 0, 0);
416  
417     AliMixture( 6, "Scintillator$",ascin,zscin,denscin,-2,wscin);
418     
419      
420     Int_t   iSXFLD = gAlice->Field()->Integ();
421     Float_t sXMGMX = gAlice->Field()->Max();
422     
423     Float_t tmaxfd, stemax, deemax, epsil, stmin;
424         
425     tmaxfd = 10.;
426     stemax = 0.1;
427     deemax = 0.1;     
428     epsil  = 0.001;
429     stmin  = 0.001;
430   
431 //  Active Air :    
432     AliMedium(1, "ACTIVE AIR$", 1, 1, iSXFLD, sXMGMX,
433               10.0, 1.0, 0.1, 0.1, 10.0, 0, 0) ;
434
435 //  Inactive air : 
436   
437     AliMedium(11, "INACTIVE AIR$", 11, 0, iSXFLD, sXMGMX,
438               10.0, 1.0, 0.1, 0.1, 10.0, 0, 0) ;
439     
440     AliMedium(2, "CARBON$ ", 2,  1, iSXFLD, sXMGMX,
441               tmaxfd, stemax, deemax, epsil, stmin, 0, 0);   
442
443     AliMedium(3, "QUARZ$", 3, 1, iSXFLD, sXMGMX,
444               tmaxfd, fMaxStepQua, fMaxDestepQua, epsil, stmin, 0, 0);
445     
446     AliMedium(4,"ALUMINUM1$",4, 1, iSXFLD, sXMGMX,
447               tmaxfd, fMaxStepAlu, fMaxDestepAlu, epsil, stmin, 0, 0);
448               
449
450     AliMedium(5,"ALUMINUM2$",5, 1, iSXFLD, sXMGMX,
451               tmaxfd, fMaxStepAlu, fMaxDestepAlu, epsil, stmin, 0, 0);    
452
453     AliMedium(6,"SCINTILLATOR$",6, 1, iSXFLD, sXMGMX, 10.0, 0.1, 0.1, 0.003, 0.003, 0, 0);
454
455     gMC->Gstpar(idtmed[3000], "LOSS", 1.);  //  [3000] = air ACTIF  [3010] = air INACTIF
456     gMC->Gstpar(idtmed[3000], "HADR", 1.);
457     gMC->Gstpar(idtmed[3000], "DCAY", 1.);
458     gMC->Gstpar(idtmed[3000], "DRAY", 1.);
459     
460     gMC->Gstpar(idtmed[3001], "LOSS", 1.);  //  [3001] = carbon
461     gMC->Gstpar(idtmed[3001], "HADR", 1.);
462     gMC->Gstpar(idtmed[3001], "DCAY", 1.);
463     gMC->Gstpar(idtmed[3001], "DRAY", 1.);
464
465     gMC->Gstpar(idtmed[3002], "LOSS", 1.);  //  [3002] = quartz
466     gMC->Gstpar(idtmed[3002], "HADR", 1.);
467     gMC->Gstpar(idtmed[3002], "DCAY", 1.);
468     gMC->Gstpar(idtmed[3002], "DRAY", 1.);  
469     gMC->Gstpar(idtmed[3002], "CUTGAM",0.5E-4) ; 
470     gMC->Gstpar(idtmed[3002], "CUTELE",1.0E-4) ;
471     
472     gMC->Gstpar(idtmed[3003], "LOSS", 1.);  //  [3003] = normal aluminum
473     gMC->Gstpar(idtmed[3003], "HADR", 1.);
474     gMC->Gstpar(idtmed[3003], "DCAY", 1.);
475     gMC->Gstpar(idtmed[3003], "DRAY", 1.);
476     
477     gMC->Gstpar(idtmed[3004], "LOSS", 1.);  //  [3004] = reflecting aluminum
478     gMC->Gstpar(idtmed[3004], "HADR", 1.);
479     gMC->Gstpar(idtmed[3004], "DCAY", 1.);
480     gMC->Gstpar(idtmed[3004], "DRAY", 1.);
481     gMC->Gstpar(idtmed[3004], "CUTGAM",0.5E-4) ; 
482     gMC->Gstpar(idtmed[3004], "CUTELE",1.0E-4) ;
483     
484     gMC->Gstpar(idtmed[3005], "LOSS", 1.);  //  [3005] = scintillator
485     gMC->Gstpar(idtmed[3005], "HADR", 1.);
486     gMC->Gstpar(idtmed[3005], "DCAY", 1.);
487     gMC->Gstpar(idtmed[3005], "DRAY", 1.); 
488     gMC->Gstpar(idtmed[3005], "CUTGAM",0.5E-4) ; 
489     gMC->Gstpar(idtmed[3005], "CUTELE",1.0E-4) ;
490       
491     
492 //    geant3->Gsckov(idtmed[3002], 14, ppckov, absco_quarz, effic_all,rindex_quarz);    
493 //    geant3->Gsckov(idtmed[3004], 14, ppckov_alu, absco_alu, effic_alu, rindex_alu);
494
495 //    gMC->SetCerenkov(idtmed[3002], 14, ppckov, absco_quarz, effic_all,rindex_quarz);    
496 //    gMC->SetCerenkov(idtmed[3004], 14, ppckov_alu, absco_alu, effic_alu, rindex_alu);
497                                        
498 }
499
500 //_____________________________________________________________________________
501 void AliVZEROv4::DrawModule() const
502 {
503
504 //  Drawing is done in DrawVZERO.C
505
506    AliDebug(2,"VZERO DrawModule");
507 }
508
509 //_____________________________________________________________________________
510 void AliVZEROv4::Init()
511 {
512 // Initialises version 2 of the VZERO Detector
513 // Just prints an information message
514   
515   AliDebug(2,Form("VZERO version %d initialized",IsVersion()));
516    
517 //   gMC->SetMaxStep(fMaxStepAlu);
518 //   gMC->SetMaxStep(fMaxStepQua);
519    
520     AliVZERO::Init();  
521 }
522
523 //_____________________________________________________________________________
524 void AliVZEROv4::StepManager()
525 {
526  
527 // Step Manager, called at each step 
528  
529      Int_t     copy;
530      static    Int_t   vol[4];
531      static    Float_t hits[21];
532      static    Float_t eloss, tlength;
533      static    Int_t   nPhotonsInStep;
534      static    Int_t   nPhotons; 
535      static    Int_t   numStep;
536      Float_t   ringNumber;
537      Float_t   destep, step;
538      
539      numStep += 1; 
540           
541 //   We keep only charged tracks :
542      
543      if ( !gMC->TrackCharge() || !gMC->IsTrackAlive() ) return; 
544
545      vol[0]    = gMC->CurrentVolOffID(1, vol[1]);
546      vol[2]    = gMC->CurrentVolID(copy);
547      vol[3]    = copy;
548      
549      static Int_t idV0R1 = gMC->VolId("V0R1");
550      static Int_t idV0L1 = gMC->VolId("V0L1");
551      static Int_t idV0R2 = gMC->VolId("V0R2");
552      static Int_t idV0L2 = gMC->VolId("V0L2");
553      static Int_t idV0R3 = gMC->VolId("V0R3");
554      static Int_t idV0L3 = gMC->VolId("V0L3");
555      static Int_t idV0R4 = gMC->VolId("V0R4");
556      static Int_t idV0L4 = gMC->VolId("V0L4");
557
558      if      ( gMC->CurrentVolID(copy) == idV0R1 ||
559                gMC->CurrentVolID(copy) == idV0L1 )
560                ringNumber = 1.0;
561      else if ( gMC->CurrentVolID(copy) == idV0R2 ||
562                gMC->CurrentVolID(copy) == idV0L2 ) 
563                ringNumber = 2.0;  
564      else if ( gMC->CurrentVolID(copy) == idV0R3 ||
565                gMC->CurrentVolID(copy) == idV0L3 )
566                ringNumber = 3.0;
567      else if ( gMC->CurrentVolID(copy) == idV0R4 ||
568                gMC->CurrentVolID(copy) == idV0L4 )
569                ringNumber = 4.0;               
570      else
571                ringNumber = 0.0;
572
573      if  (  ringNumber > 0.5  ) { 
574      
575         destep    = gMC->Edep();
576         step      = gMC->TrackStep();
577         
578         nPhotonsInStep  = Int_t(destep / (fLightYield *1e-9) ); 
579         nPhotonsInStep  = gRandom->Poisson(nPhotonsInStep);
580         
581         eloss    += destep;
582         tlength  += step;        
583         
584         if  ( gMC->IsTrackEntering()  )  { 
585          
586             nPhotons  =  nPhotonsInStep;       
587             gMC->TrackPosition(fTrackPosition);
588             gMC->TrackMomentum(fTrackMomentum);
589             
590             Float_t pt  = TMath::Sqrt( fTrackMomentum.Px() * fTrackMomentum.Px() +
591                                        fTrackMomentum.Py() * fTrackMomentum.Py() );
592                
593             hits[0]  = fTrackPosition.X();
594             hits[1]  = fTrackPosition.Y();
595             hits[2]  = fTrackPosition.Z();               
596             hits[3]  = Float_t (gMC->TrackPid()); 
597
598             hits[4]  = gMC->TrackTime();
599             hits[5]  = gMC->TrackCharge();
600             hits[6]  = fTrackMomentum.Theta()*TMath::RadToDeg();
601             hits[7]  = fTrackMomentum.Phi()*TMath::RadToDeg();
602             hits[8]  = ringNumber;
603          
604             hits[9]  = pt;
605             hits[10] = fTrackMomentum.P();
606             hits[11] = fTrackMomentum.Px();
607             hits[12] = fTrackMomentum.Py();
608             hits[13] = fTrackMomentum.Pz();
609             
610             TParticle *par = gAlice->GetMCApp()->Particle(gAlice->GetMCApp()->GetCurrentTrackNumber());
611             hits[14] = par->Vx();
612             hits[15] = par->Vy();
613             hits[16] = par->Vz();
614             
615             tlength  = 0.0;
616             eloss    = 0.0;         
617          }
618          
619          nPhotons  = nPhotons + nPhotonsInStep;
620          
621          if( gMC->IsTrackExiting() || gMC->IsTrackStop() || gMC->IsTrackDisappeared()){
622          
623          nPhotons  = nPhotons - Int_t((Float_t(nPhotons) * fLightAttenuation * fnMeters));       
624          nPhotons  = nPhotons - Int_t( Float_t(nPhotons) * fFibToPhot);  
625          
626          hits[17] =   eloss;
627          hits[18] = tlength;
628          hits[19] = nPhotons;
629          hits[20] = GetCellId (vol, hits); 
630                  
631          AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol, hits);
632                  
633          tlength         = 0.0;
634          eloss           = 0.0; 
635          nPhotons        =   0;
636          nPhotonsInStep  =   0;
637          
638          numStep         =   0;  
639          } 
640     }
641       
642 }
643
644 //_____________________________________________________________________________
645 void AliVZEROv4::AddHit(Int_t track, Int_t *vol, Float_t *hits)
646 {
647   
648 //  Adds a VZERO hit
649   
650   TClonesArray &lhits = *fHits;
651   new(lhits[fNhits++]) AliVZEROhit(fIshunt,track,vol,hits);
652 }
653
654 //_____________________________________________________________________________
655 void AliVZEROv4::AddDigits(Int_t *tracks, Int_t* digits) 
656 {
657
658 //  Adds a VZERO digit
659
660    TClonesArray  &ldigits = *fDigits;
661    new(ldigits[fNdigits++]) AliVZEROdigit(tracks, digits);
662 }
663
664 //_____________________________________________________________________________
665 void AliVZEROv4::MakeBranch(Option_t *option)
666 {
667   
668 // Creates new branches in the current Root Tree
669     
670   char branchname[10];
671   sprintf(branchname,"%s",GetName());
672   AliDebug(2,Form("fBufferSize = %d",fBufferSize));
673   
674   const char *cH = strstr(option,"H");
675   
676   if (fHits   && fLoader->TreeH() && cH) {
677     fLoader->TreeH()->Branch(branchname,&fHits, fBufferSize);
678     AliDebug(2,Form("Making Branch %s for hits",branchname));
679   }     
680
681   const char *cD = strstr(option,"D");
682   
683   if (fDigits   && fLoader->TreeD() && cD) {
684     fLoader->TreeD()->Branch(branchname,&fDigits, fBufferSize);
685     AliDebug(2,Form("Making Branch %s for digits",branchname));
686   }  
687    
688 }
689
690 //_____________________________________________________________________________
691 Int_t AliVZEROv4::GetCellId(Int_t *vol, Float_t *hits) 
692 {
693
694   //   Returns Id of scintillator cell
695   //   Right side from  0 to 47
696   //   Left  side from 48 to 95
697
698    Int_t index = vol[1];
699    fCellId     = 0;
700    
701    if (index < 10) index = index + 12; 
702    
703    if (hits[2] < 0.0) { 
704       index = (index - 10) + ( ( Int_t(hits[8]) - 1 ) * 12);
705       fCellId   = index;
706    }
707    else if (hits[2] > 0.0)
708    {
709       index = (index + 38) + ( ( Int_t(hits[8]) - 1 ) * 12);
710       fCellId   = index;}
711            
712    return fCellId;
713 }