Adding TDC channel delays to the calib object.
[u/mrichter/AliRoot.git] / VZERO / AliVZEROv3.cxx
1 /**************************************************************************
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3  *                                                                        *
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15
16 /* $Id$ */
17
18 //////////////////////////////////////////////////////////////////////
19 //                                                                  //
20 //  (V-zero) detector  version 3  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   4th of december 2003                         //
24 //  (now 3 rings instead of 5 rings as in previous versions -budget //
25 //   cuts !! - therefore changes in cell dimensions and offsets)    //
26 //   previous ring 1 and ring 2 become now ring 1                   //
27 //   previous ring 3 and ring 4 become now ring 2                   //
28 //   previous ring 5 becomes now ring 3  - both for Left and Right  //    
29 //   V0R (now V0C) sits between Z values  -89.4 and  -84.9 cm       //
30 //   V0L (now V0A) sits between Z values +350.0 and +352.0 cm       //
31 //   New coordinate system has been implemented in october 2003     //
32 //                                                                  //
33 //////////////////////////////////////////////////////////////////////
34
35 // --- Standard libraries ---
36 #include <Riostream.h>
37 #include <stdlib.h>
38 #include <string.h>
39
40 // --- ROOT libraries ---
41 #include <TClonesArray.h>
42 #include <TGeoGlobalMagField.h>
43 #include <TLorentzVector.h>
44 #include <TMath.h>
45 #include <TObjectTable.h>
46 #include <TParticle.h>
47 #include <TVirtualMC.h>
48
49 // --- AliRoot header files ---
50 #include "AliConst.h"
51 #include "AliLog.h"
52 #include "AliMC.h"
53 #include "AliMagF.h"
54 #include "AliRun.h"
55 #include "AliVZEROLoader.h"
56 #include "AliVZEROdigit.h"
57 #include "AliVZEROhit.h"
58 #include "AliVZEROv3.h"
59  
60 ClassImp(AliVZEROv3)
61
62 //_____________________________________________________________________________
63 AliVZEROv3:: AliVZEROv3():AliVZERO(),
64    fCellId(0),
65    fTrackPosition(),
66    fTrackMomentum(), 
67    fLightYield(93.75),
68    fLightAttenuation(0.05),
69    fnMeters(15.0),
70    fFibToPhot(0.3)
71 {
72 // Standard default constructor 
73 }
74
75 //_____________________________________________________________________________
76 AliVZEROv3::AliVZEROv3(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 // Standard constructor for V-zero Detector  version 2
88
89   AliDebug(2,"Create VZERO object");
90       
91 //   fLightYield              =  93.75;
92 //   fLightAttenuation        =   0.05; 
93 //   fnMeters                 =   15.0;  
94 //   fFibToPhot               =    0.3;
95  
96 }
97
98 //_____________________________________________________________________________
99 void AliVZEROv3::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; 
117   Float_t  heightRight;
118   Float_t  theta;  
119   
120   Float_t  halfThickQua;
121   
122   Float_t  zdet;
123   Float_t  r0Right, r3Right;
124   Float_t  pi = TMath::Pi();
125     
126   height1Right    =     1.82 + 3.81;  // height of cell 1, in cm
127   height2Right    =     4.72 + 7.12;  // height of cell 2, in cm
128   height3Right    =           10.83;  // height of cell 3, in cm
129   
130   theta       = pi/6.0/2.0;       // half angular opening = 15 degrees
131     
132   halfThickQua= fThickness1/2.0;  // half thickness of elementary cell (inner ring)
133   
134 // distance 0.6 cm in zdet accounts for the fact V0R box back lid sits 0.6 away from 
135 // absorber nose sitting at 90 cm. Will use -zdet later...
136 // size of V0R box  (fThickness) is increased by 1 mm as compared to version v2 
137
138   fThickness  =    fThickness + 0.1;  
139   zdet        =    90.0 - 0.6 - fThickness/2.0;  // distance to vertex (along Z axis)   
140   r0Right     =    4.05;          // closest distance to center of the beam pipe
141   heightRight =    height1Right + height2Right + height3Right;
142   r3Right     =    r0Right + heightRight;
143
144 // Creation of mother volume v0LE - left part - :
145 // Entrance face at  +350.0 cm  (new coordinate system) ...
146
147    Float_t   partube[3];
148    
149    partube[0] =  4.3;
150    partube[1] = 45.0;
151    partube[2] = fThickness1/2.0;   
152     
153    gMC->Gsvolu("V0LE","TUBE",idtmed[3005],partube,3);
154      
155 // Creation of five rings - left part - :
156 // Entrance face at +350.0 cm  (new coordinate system) ... 
157
158 // Mother volume v0L0 in which will be set 5 scintillator cells 
159
160   Float_t   partubs[5];  
161     
162   Float_t   r0Left      =   4.3;   
163   Float_t   height1Left =   2.6 +  4.1;  // previous ring 1 + ring 2
164   Float_t   height2Left =   6.4 + 10.2;  // previous ring 3 + ring 4
165   Float_t   height3Left =  16.9;  
166   Float_t   heightLeft  =   height1Left + height2Left + height3Left; 
167                                       
168   Float_t   r3Left      =   r0Left  + heightLeft; 
169   
170   partubs[0]     =  r0Left;
171   partubs[1]     =  r3Left;
172   partubs[2]     =  fThickness1/2.0;
173   partubs[3]     =  90.0-15.0;
174   partubs[4]     = 120.0-15.0;
175
176   gMC->Gsvolu("V0L0","TUBS",idtmed[3010],partubs,5);  // air volume
177   
178   Float_t  r1Left =  r0Left + height1Left;        
179      
180   partubs[0]     =  r0Left;
181   partubs[1]     =  r1Left;
182
183   gMC->Gsvolu("V0L1","TUBS",idtmed[3005],partubs,5);  // quartz volume
184   gMC->Gspos("V0L1",1,"V0L0", 0.0, 0.0 , 0.0, 0,"ONLY"); 
185
186   Float_t  r2Left  =  r1Left + height2Left;       
187   
188   partubs[0]     =  r1Left;
189   partubs[1]     =  r2Left;
190
191   gMC->Gsvolu("V0L2","TUBS",idtmed[3005],partubs,5);  // quartz volume
192   gMC->Gspos("V0L2",1,"V0L0", 0.0, 0.0 , 0.0, 0,"ONLY"); 
193     
194   partubs[0]     =  r2Left;
195   partubs[1]     =  r3Left;
196
197   gMC->Gsvolu("V0L3","TUBS",idtmed[3005],partubs,5);  // quartz volume
198   gMC->Gspos("V0L3",1,"V0L0", 0.0, 0.0 , 0.0, 0,"ONLY");
199   
200
201 // Creation of mother volume v0RI - right part - :
202   
203   partube[0] = r0Right - 0.2;
204   partube[1] = r3Right + 1.0;
205   partube[2] = fThickness/2.0; 
206       
207   gMC->Gsvolu("V0RI","TUBE",idtmed[3010],partube,3);
208   
209 // Creation of  carbon lids (3.5 mm thick) to keep v0RI box shut...
210
211   Float_t  lidThickness = 0.35;
212  
213   partube[0] =   r0Right;
214   partube[1] =   r3Right;
215   partube[2] =   +lidThickness/2.0;
216     
217   gMC->Gsvolu("V0CA","TUBE",idtmed[3001],partube,3); 
218   gMC->Gspos("V0CA",1,"V0RI",0.0,0.0, fThickness/2.0-partube[2],0,"ONLY");
219   gMC->Gspos("V0CA",2,"V0RI",0.0,0.0,-fThickness/2.0+partube[2],0,"ONLY");
220   
221 // Creation of aluminum rings to maintain the v0RI pieces ...
222
223   partube[0] =   r0Right - 0.2;
224   partube[1] =   r0Right;
225   partube[2] =   +fThickness/2.0;
226    
227   gMC->Gsvolu("V0IR","TUBE",idtmed[3003],partube,3);    
228   gMC->Gspos("V0IR",1,"V0RI",0.0,0.0,0.0,0,"ONLY");
229
230   partube[0] =   r3Right;
231   partube[1] =   r3Right + 1.0;
232   partube[2] =   +fThickness/2.0;
233  
234   gMC->Gsvolu("V0ER","TUBE",idtmed[3003],partube,3);    
235   gMC->Gspos("V0ER",1,"V0RI",0.0,0.0,0.0,0,"ONLY");
236   
237 // Mother volume v0R0 in which will be set 3  scintillator cells 
238   
239   partubs[0]      =  r0Right;
240   partubs[1]      =  r3Right;
241   partubs[2]      =  fThickness/2.0;
242   partubs[3]      =  90.0-15.0;
243   partubs[4]      = 120.0-15.0;
244
245   gMC->Gsvolu("V0R0","TUBS",idtmed[3010],partubs,5);  // air volume 
246
247 // Elementary cell of ring 1 :
248 // (cells of ring 1  will be shifted by 1.7 cm towards vertex to output fibers) 
249    
250   Float_t   offsetFibers  =  1.7;
251   Float_t   offset        =  fThickness/2.0 - lidThickness - fThickness1/2.0; 
252   Float_t   r1Right       =  r0Right + height1Right;
253       
254   partubs[0]     =  r0Right;
255   partubs[1]     =  r1Right;
256   partubs[2]     =  fThickness1/2.0;
257   
258   gMC->Gsvolu("V0R1","TUBS",idtmed[3005],partubs,5);  // scintillator volume
259   gMC->Gspos("V0R1",1,"V0R0", 0.0, 0.0 , -offset + offsetFibers, 0,"ONLY"); 
260
261 // Elementary cell of ring 2 :
262
263   Float_t   r2Right   =  r1Right + height2Right;       
264   
265   partubs[0]     =  r1Right;
266   partubs[1]     =  r2Right;
267
268   gMC->Gsvolu("V0R2","TUBS",idtmed[3005],partubs,5);  // scintillator volume
269   gMC->Gspos("V0R2",1,"V0R0", 0.0, 0.0 , -offset, 0,"ONLY"); 
270
271
272 // Elementary cell of ring 3 :
273    
274   partubs[0]     =  r2Right;
275   partubs[1]     =  r3Right;
276
277   gMC->Gsvolu("V0R3","TUBS",idtmed[3005],partubs,5);  // scintillator volume
278   gMC->Gspos("V0R3",1,"V0R0", 0.0, 0.0 , -offset, 0,"ONLY");
279
280
281   Float_t  phiDeg = 180./6.; 
282
283 // Right part : 
284  
285   for(Float_t  phi = 15.0 ; phi < 360.0; phi = phi + phiDeg)
286       {        
287         AliMatrix(idrotm[902], 90.0, phi, 90.0, 90.0 +phi, 0.0 , 0.0);
288         gMC->Gspos("V0R0",ndetR,"V0RI",0.0,
289                           0.0,0.0,idrotm[902],"ONLY");
290         ndetR++;
291        }
292
293   gMC->Gspos("V0RI",1,"ALIC",0.0,0.0,-zdet,0,"ONLY");
294  
295   ncellsR = (ndetR - 1) * 3;  
296   AliInfo(Form("Number of cells on Right side =   %d",ncellsR));    
297
298 // Left part :
299   
300   for(Float_t  phi = 15.0 ; phi < 360.0; phi = phi + phiDeg)
301       {       
302         AliMatrix(idrotm[902], 90.0, phi, 90.0, 90.0 +phi, 0.0 , 0.0);
303         gMC->Gspos("V0L0",ndetL,"V0LE",0.0,
304                           0.0,0.0,idrotm[902],"ONLY");
305         ndetL++;
306        }
307
308   gMC->Gspos("V0LE",1,"ALIC",0.0,0.0,350.0+fThickness1/2.0,0,"ONLY");
309  
310   ncellsL = (ndetL - 1) * 3;
311   AliInfo(Form("Number of cells on Left side  =   %d",  ncellsL));    
312            
313 }
314             
315 //_____________________________________________________________________________
316 void AliVZEROv3::CreateMaterials()
317 {
318
319 // Creates materials used for geometry 
320
321     AliDebug(2,"VZERO create materials");
322     
323 /*
324     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, 
325                            6.9e-9, 7.1e-9, 7.3e-9, 7.5e-9, 7.7e-9, 7.9e-9, 8.1e-9 };
326
327            
328     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, 
329                                6.9e-9, 7.1e-9, 7.3e-9, 7.5e-9, 7.7e-9, 7.9e-9, 8.1e-9 };
330                            
331     Float_t rindex_quarz[14] = { 1.52398,  1.53090, 1.53835, 1.54641, 1.55513, 1.56458, 
332                                  1.57488,  1.58611, 1.59842, 1.61197, 1.62696, 1.64362, 
333                                  1.662295, 1.68337 };
334                                  
335     Float_t absco_quarz[14] = { 105.8,  45.656, 35.665, 28.598, 25.007, 21.04, 17.525, 
336                                 14.177, 9.282, 4.0925, 1.149, 0.3627, 0.1497, 0.05 };   
337                                                                                         
338     Float_t effic_all[14]   = { 1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1. };
339     
340         
341     Float_t rindex_alu[14] = { 1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1. }; 
342     
343     
344     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,
345                                1e-4,1e-4,1e-4,1e-4 };
346     Float_t effic_alu[14]  = { 1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1. };
347
348 */        
349
350     Int_t *idtmed = fIdtmed->GetArray()-2999;
351     
352     
353 //  Parameters related to Quarz (SiO2) :
354  
355     Float_t aqua[2], zqua[2], densqua, wmatqua[2];
356     Int_t nlmatqua;
357     
358     aqua[0]    = 28.09;
359     aqua[1]    = 16.;
360     zqua[0]    = 14.;
361     zqua[1]    = 8.;
362     densqua    = 2.64;
363     nlmatqua   = -2;
364     wmatqua[0] = 1.;
365     wmatqua[1] = 2.;
366
367 // Parameters  related to aluminum sheets :
368     
369     Float_t  aal   = 26.98;
370     Float_t  zal   = 13.00; 
371     Float_t  densal=   2.7; 
372     Float_t  radlal=   8.9;
373        
374 // Parameters  related to scintillator CH :
375     
376     Float_t ascin[2] = {1.00794,12.011};
377     Float_t zscin[2] = {1.,6.};
378     Float_t wscin[2] = {1.,1.};
379     Float_t denscin  = 1.032;
380     
381 // AIR
382
383     Float_t aAir[4]={12.,14.,16.,36.};
384     Float_t zAir[4]={6.,7.,8.,18.};
385     Float_t wAir[4]={0.000124,0.755267,0.231781,0.012827};
386     Float_t dAir = 1.20479E-3;
387     
388 //  Definition of materials :
389
390 // AIR
391
392     AliMixture( 1, "AIR A$", aAir,zAir,dAir,4,wAir);
393     AliMixture(11, "AIR I$", aAir,zAir,dAir,4,wAir);
394     AliMaterial( 2, "CARBON$"  , 12.01, 6.0, 2.265, 18.8, 49.9, 0, 0);
395     AliMixture(  3, "QUA", aqua, zqua, densqua, nlmatqua, wmatqua);
396     AliMaterial( 4, "ALUMINIUM1$", 26.98, 13., 2.7, 8.9, 37.2, 0, 0);
397     AliMaterial( 5, "ALUMINIUM2$", aal, zal, densal, radlal, 0, 0, 0);
398  
399     AliMixture( 6, "Scintillator$",ascin,zscin,denscin,-2,wscin);
400          
401     Int_t   iSXFLD = ((AliMagF*)TGeoGlobalMagField::Instance()->GetField())->Integ();     // Field type  
402     Float_t sXMGMX = ((AliMagF*)TGeoGlobalMagField::Instance()->GetField())->Max();       // Field max.
403     
404     Float_t tmaxfd, stemax, deemax, epsil, stmin;
405         
406     tmaxfd = 10.;
407     stemax = 0.1;
408     deemax = 0.1;     
409     epsil  = 0.001;
410     stmin  = 0.001;
411   
412 //  Active Air :    
413     AliMedium(1, "ACTIVE AIR$", 1, 1, iSXFLD, sXMGMX,
414               10.0, 1.0, 0.1, 0.1, 10.0, 0, 0) ;
415
416 //  Inactive air : 
417   
418     AliMedium(11, "INACTIVE AIR$", 11, 0, iSXFLD, sXMGMX,
419               10.0, 1.0, 0.1, 0.1, 10.0, 0, 0) ;
420     
421     AliMedium(2, "CARBON$ ", 2,  1, iSXFLD, sXMGMX,
422               tmaxfd, stemax, deemax, epsil, stmin, 0, 0);   
423
424     AliMedium(3, "QUARZ$", 3, 1, iSXFLD, sXMGMX,
425               tmaxfd, fMaxStepQua, fMaxDestepQua, epsil, stmin, 0, 0);
426     
427     AliMedium(4,"ALUMINUM1$",4, 1, iSXFLD, sXMGMX,
428               tmaxfd, fMaxStepAlu, fMaxDestepAlu, epsil, stmin, 0, 0);
429               
430
431     AliMedium(5,"ALUMINUM2$",5, 1, iSXFLD, sXMGMX,
432               tmaxfd, fMaxStepAlu, fMaxDestepAlu, epsil, stmin, 0, 0);    
433
434     AliMedium(6,"SCINTILLATOR$",6, 1, iSXFLD, sXMGMX, 10.0, 0.1, 0.1, 0.003, 0.003, 0, 0);
435
436     gMC->Gstpar(idtmed[3000], "LOSS", 1.);  //  [3000] = air ACTIF  [3010] = air INACTIF
437     gMC->Gstpar(idtmed[3000], "HADR", 1.);
438     gMC->Gstpar(idtmed[3000], "DCAY", 1.);
439     gMC->Gstpar(idtmed[3000], "DRAY", 1.);
440     
441     gMC->Gstpar(idtmed[3001], "LOSS", 1.);  //  [3001] = carbon
442     gMC->Gstpar(idtmed[3001], "HADR", 1.);
443     gMC->Gstpar(idtmed[3001], "DCAY", 1.);
444     gMC->Gstpar(idtmed[3001], "DRAY", 1.);
445
446     gMC->Gstpar(idtmed[3002], "LOSS", 1.);  //  [3002] = quartz
447     gMC->Gstpar(idtmed[3002], "HADR", 1.);
448     gMC->Gstpar(idtmed[3002], "DCAY", 1.);
449     gMC->Gstpar(idtmed[3002], "DRAY", 1.);  
450     gMC->Gstpar(idtmed[3002], "CUTGAM",0.5E-4) ; 
451     gMC->Gstpar(idtmed[3002], "CUTELE",1.0E-4) ;
452     
453     gMC->Gstpar(idtmed[3003], "LOSS", 1.);  //  [3003] = normal aluminum
454     gMC->Gstpar(idtmed[3003], "HADR", 1.);
455     gMC->Gstpar(idtmed[3003], "DCAY", 1.);
456     gMC->Gstpar(idtmed[3003], "DRAY", 1.);
457     
458     gMC->Gstpar(idtmed[3004], "LOSS", 1.);  //  [3004] = reflecting aluminum
459     gMC->Gstpar(idtmed[3004], "HADR", 1.);
460     gMC->Gstpar(idtmed[3004], "DCAY", 1.);
461     gMC->Gstpar(idtmed[3004], "DRAY", 1.);
462     gMC->Gstpar(idtmed[3004], "CUTGAM",0.5E-4) ; 
463     gMC->Gstpar(idtmed[3004], "CUTELE",1.0E-4) ;
464     
465     gMC->Gstpar(idtmed[3005], "LOSS", 1.);  //  [3005] = scintillator
466     gMC->Gstpar(idtmed[3005], "HADR", 1.);
467     gMC->Gstpar(idtmed[3005], "DCAY", 1.);
468     gMC->Gstpar(idtmed[3005], "DRAY", 1.); 
469     gMC->Gstpar(idtmed[3005], "CUTGAM",0.5E-4) ; 
470     gMC->Gstpar(idtmed[3005], "CUTELE",1.0E-4) ;
471       
472     
473 //    geant3->Gsckov(idtmed[3002], 14, ppckov, absco_quarz, effic_all,rindex_quarz);    
474 //    geant3->Gsckov(idtmed[3004], 14, ppckov_alu, absco_alu, effic_alu, rindex_alu);
475
476 //    gMC->SetCerenkov(idtmed[3002], 14, ppckov, absco_quarz, effic_all,rindex_quarz);    
477 //    gMC->SetCerenkov(idtmed[3004], 14, ppckov_alu, absco_alu, effic_alu, rindex_alu);
478                                        
479 }
480
481 //_____________________________________________________________________________
482 void AliVZEROv3::DrawModule() const
483 {
484
485 //  Drawing is done in DrawVZERO.C
486
487    AliDebug(2,"VZERO DrawModule");
488
489 }
490
491 //_____________________________________________________________________________
492 void AliVZEROv3::Init()
493 {
494 // Initialises version 2 of the VZERO Detector
495 // Just prints an information message
496   
497   AliInfo(Form("VZERO version %d initialized",IsVersion()));
498    
499 //   gMC->SetMaxStep(fMaxStepAlu);
500 //   gMC->SetMaxStep(fMaxStepQua);
501    
502     AliVZERO::Init();
503   
504 }
505
506
507 //_____________________________________________________________________________
508 void AliVZEROv3::StepManager()
509 {
510  
511 // Step Manager, called at each step 
512  
513      Int_t     copy;
514      static    Int_t   vol[4];
515      static    Float_t hits[21];
516      static    Float_t eloss, tlength;
517      static    Int_t   nPhotonsInStep;
518      static    Int_t   nPhotons; 
519      static    Int_t   numStep;
520      Float_t   ringNumber;
521      Float_t   destep, step;
522      
523      numStep += 1; 
524           
525 //   We keep only charged tracks :
526      
527      if ( !gMC->TrackCharge() || !gMC->IsTrackAlive() ) return; 
528
529      static Int_t idV0R1 = gMC->VolId("V0R1");
530      static Int_t idV0L1 = gMC->VolId("V0L1");
531      static Int_t idV0R2 = gMC->VolId("V0R2");
532      static Int_t idV0L2 = gMC->VolId("V0L2");
533      static Int_t idV0R3 = gMC->VolId("V0R3");
534      static Int_t idV0L3 = gMC->VolId("V0L3");
535
536      vol[0]    = gMC->CurrentVolOffID(1, vol[1]);
537      vol[2]    = gMC->CurrentVolID(copy);
538      vol[3]    = copy;
539      
540      if      ( gMC->CurrentVolID(copy) == idV0R1 ||
541                gMC->CurrentVolID(copy) == idV0L1 )
542                ringNumber = 1.0;
543      else if ( gMC->CurrentVolID(copy) == idV0R2 ||
544                gMC->CurrentVolID(copy) == idV0L2 ) 
545                ringNumber = 2.0;  
546      else if ( gMC->CurrentVolID(copy) == idV0R3 ||
547                gMC->CurrentVolID(copy) == idV0L3 )
548                ringNumber = 3.0;
549      else
550                ringNumber = 0.0;
551
552      if  (  ringNumber > 0.5  ) { 
553      
554         destep    = gMC->Edep();
555         step      = gMC->TrackStep();
556         
557         nPhotonsInStep  = Int_t(destep / (fLightYield *1e-9) ); 
558         nPhotonsInStep  = gRandom->Poisson(nPhotonsInStep);
559         
560         eloss    += destep;
561         tlength  += step;        
562         
563         if  ( gMC->IsTrackEntering()  )  { 
564          
565             nPhotons  =  nPhotonsInStep;       
566             gMC->TrackPosition(fTrackPosition);
567             gMC->TrackMomentum(fTrackMomentum);
568             
569             Float_t pt  = TMath::Sqrt( fTrackMomentum.Px() * fTrackMomentum.Px() +
570                                        fTrackMomentum.Py() * fTrackMomentum.Py() );
571                
572             hits[0]  = fTrackPosition.X();
573             hits[1]  = fTrackPosition.Y();
574             hits[2]  = fTrackPosition.Z();               
575             hits[3]  = Float_t (gMC->TrackPid()); 
576
577             hits[4]  = gMC->TrackTime();
578             hits[5]  = gMC->TrackCharge();
579             hits[6]  = fTrackMomentum.Theta()*TMath::RadToDeg();
580             hits[7]  = fTrackMomentum.Phi()*TMath::RadToDeg();
581             hits[8]  = ringNumber;
582          
583             hits[9]  = pt;
584             hits[10] = fTrackMomentum.P();
585             hits[11] = fTrackMomentum.Px();
586             hits[12] = fTrackMomentum.Py();
587             hits[13] = fTrackMomentum.Pz();
588             
589             TParticle *par = gAlice->GetMCApp()->Particle(gAlice->GetMCApp()->GetCurrentTrackNumber());
590             hits[14] = par->Vx();
591             hits[15] = par->Vy();
592             hits[16] = par->Vz();
593             
594             tlength  = 0.0;
595             eloss    = 0.0;
596             
597          }
598          
599          nPhotons  = nPhotons + nPhotonsInStep;
600          
601          if( gMC->IsTrackExiting() || gMC->IsTrackStop() || gMC->IsTrackDisappeared()){
602          
603          nPhotons  = nPhotons - Int_t( (Float_t(nPhotons) * fLightAttenuation * fnMeters) );     
604          nPhotons  = nPhotons - Int_t(  Float_t(nPhotons) * fFibToPhot );        
605          
606          hits[17] =   eloss;
607          hits[18] = tlength;
608          hits[19] = nPhotons;
609          hits[20] = GetCellId (vol, hits); 
610                  
611          AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol, hits);
612                  
613          tlength         = 0.0;
614          eloss           = 0.0; 
615          nPhotons        =   0;
616          nPhotonsInStep  =   0;
617          
618          numStep         =   0;  
619          } 
620     }
621       
622 }
623
624 //_____________________________________________________________________________
625 void AliVZEROv3::AddHit(Int_t track, Int_t *vol, Float_t *hits)
626 {
627   
628 //  Adds a VZERO hit
629   
630   TClonesArray &lhits = *fHits;
631   new(lhits[fNhits++]) AliVZEROhit(fIshunt,track,vol,hits);
632 }
633
634 //_____________________________________________________________________________
635 void AliVZEROv3::AddDigits(Int_t *tracks, Int_t* digits) 
636 {
637
638 //  Adds a VZERO digit
639
640    TClonesArray  &ldigits = *fDigits;
641    new(ldigits[fNdigits++]) AliVZEROdigit(tracks, digits);
642 }
643
644 //_____________________________________________________________________________
645 void AliVZEROv3::MakeBranch(Option_t *option)
646 {
647   
648 // Creates new branches in the current Root Tree
649     
650   char branchname[10];
651   sprintf(branchname,"%s",GetName());
652   AliDebug(2,Form("fBufferSize = %d",fBufferSize));
653   
654   const char *cH = strstr(option,"H");
655   
656   if (fHits   && fLoader->TreeH() && cH) {
657     fLoader->TreeH()->Branch(branchname,&fHits, fBufferSize);
658     AliDebug(2,Form("Making Branch %s for hits",branchname));
659   }     
660
661   const char *cD = strstr(option,"D");
662   
663   if (fDigits   && fLoader->TreeD() && cD) {
664     fLoader->TreeD()->Branch(branchname,&fDigits, fBufferSize);
665     AliDebug(2,Form("Making Branch %s for digits",branchname));
666   }  
667    
668 }
669
670 //_____________________________________________________________________________
671 Int_t AliVZEROv3::GetCellId(Int_t *vol, Float_t *hits) 
672 {
673
674   //   Returns Id of scintillator cell
675   //   Right side from  0 to 35
676   //   Left  side from 36 to 71
677
678    Int_t index = vol[1];
679    fCellId     = 0;
680    
681    if (index < 10) index = index + 12; 
682    
683    if (hits[2] < 0.0) { 
684       index = (index - 10) + ( ( Int_t(hits[8]) - 1 ) * 12);
685       fCellId   = index;
686    }
687    else if (hits[2] > 0.0)
688    {
689       index = (index  + 26) + ( ( Int_t(hits[8]) - 1 ) * 12);
690       fCellId   = index;}
691           
692    return fCellId;
693 }