Implementation of Trigger simulation (Raphael Tieulent)
[u/mrichter/AliRoot.git] / VZERO / AliVZEROv5.cxx
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3  *                                                                        *
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15
16 /* $Id$ */
17
18 //////////////////////////////////////////////////////////////////////
19 //                                                                  //
20 //  (V-zero) detector  version 5  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  16 th of june 2004                            //
24 //  (now 8 sectors instead of 12 sectors as in previous version)    // 
25 //   V0R (now V0C) sits between Z values  -89.6 and  -84.9 cm       //
26 //   V0L (now V0A) sits between Z values +339.0 and +341.0 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 <TGeoGlobalMagField.h>
39 #include <TLorentzVector.h>
40 #include <TMath.h>
41 #include <TObjectTable.h>
42 #include <TParticle.h>
43 #include <TVirtualMC.h>
44
45 // --- AliRoot header files ---
46 #include "AliRun.h"
47 #include "AliMC.h"
48 #include "AliConst.h"
49 #include "AliMagF.h"
50 #include "AliVZEROLoader.h"
51 #include "AliVZEROdigit.h"
52 #include "AliVZEROhit.h"
53 #include "AliVZEROv5.h"
54 #include "AliLog.h"
55  
56 ClassImp(AliVZEROv5)
57
58 //_____________________________________________________________________________
59 AliVZEROv5:: AliVZEROv5():AliVZERO(),
60    fCellId(0),
61    fTrackPosition(),
62    fTrackMomentum(), 
63    fLightYield(93.75),
64    fLightAttenuation(0.05),
65    fnMeters(15.0),
66    fFibToPhot(0.3)
67 {
68 // Standard default constructor 
69 }
70
71 //_____________________________________________________________________________
72 AliVZEROv5::AliVZEROv5(const char *name, const char *title):
73    AliVZERO(name,title),
74    fCellId(0),
75    fTrackPosition(),
76    fTrackMomentum(),
77    fLightYield(93.75),
78    fLightAttenuation(0.05),
79    fnMeters(15.0),
80    fFibToPhot(0.3)    
81 {
82
83 // Standard constructor for V-zero Detector  version 5
84
85   AliDebug(2,"Create VZERO object ");
86 //       
87 //   fLightYield              =  93.75; // Light yield in BC408 (93.75 eV per photon)
88 //   fLightAttenuation        =   0.05; // Light attenuation in fiber (0.05 per meter)
89 //   fnMeters                 =   15.0; // Number of meters of clear fibers to PM
90 //   fFibToPhot               =    0.3; // Attenuation at fiber-photocathode interface
91 }
92
93 //_____________________________________________________________________________
94 void AliVZEROv5::CreateGeometry()
95 {
96
97 // Creates the GEANT geometry of the V-zero Detector  version 5
98   
99   AliDebug(2,"Create Geometry ");
100       
101   Int_t    *idtmed = fIdtmed->GetArray()-2999;
102
103   Int_t    ndetR = 1;
104   Int_t    ndetL = 1;
105  
106   Int_t    ncellsR = 1;
107   Int_t    ncellsL = 1;
108   
109   Int_t    idrotm[999];
110  
111   Float_t  height1Right, height2Right, height3Right, height4Right; 
112   Float_t  heightRight;
113   Float_t  theta;  
114   
115   Float_t  halfThickQua;
116   
117   Float_t  zdet;
118   Float_t  r0Right, r4Right, rBoxRight;
119   Float_t  pi = TMath::Pi();
120     
121   height1Right    =     2.6;  // height of cell 1, in cm
122   height2Right    =     4.6;  // height of cell 2, in cm
123   height3Right    =     7.6;  // height of cell 3, in cm
124   height4Right    =    12.7;  // height of cell 4, in cm
125   
126   theta       = pi/4.0/2.0;       // half angular opening = 22.5 degrees
127     
128   halfThickQua= fThickness1/2.0;  // half thickness of elementary cell (inner ring)
129   
130 // distance 0.6 cm in zdet accounts for the fact V0R box back lid sits 0.6 away from 
131 // absorber nose sitting at 90 cm. Will use -zdet later...
132 // size of V0R box (fThickness) is increased by 3 mm as compared to basic version  
133
134   fThickness  =    fThickness + 0.3;             // now 4.7 cm instead of 4.4 cm
135   zdet        =    90.0 - 0.6 - fThickness/2.0;  // distance to vertex (along Z axis)   
136   r0Right     =    4.20;          // closest distance to center of the beam pipe
137   heightRight =    height1Right + height2Right + height3Right + height4Right;
138   r4Right     =    r0Right + heightRight + 0.3;
139   rBoxRight   =    38.0;          // external radius of right box
140      
141 // Creation of mother volume v0LE - left part - :
142 // Entrance face at  +339.0 cm  (new coordinate system) ...
143
144    Float_t   partube[3];
145    
146    partube[0] =  4.3;
147    partube[1] = 44.0;
148    partube[2] = fThickness1/2.0;   
149     
150    gMC->Gsvolu("V0LE","TUBE",idtmed[3005],partube,3);
151      
152 // Creation of five rings - left part - :
153 // Entrance face at +339.0 cm  (new coordinate system) ... 
154
155 // Mother volume v0L0 in which will be set 5 scintillator cells 
156
157   Float_t   partubs[5];  
158     
159   Float_t   r0Left      =   4.3;   
160   Float_t   height1Left =   3.3;  
161   Float_t   height2Left =   6.2;  
162   Float_t   height3Left =   8.9; 
163   Float_t   height4Left =  20.9;  
164   Float_t   heightLeft  =   height1Left + height2Left + height3Left + height4Left; 
165                                       
166   Float_t   r4Left      =   r0Left  + heightLeft; 
167   
168   partubs[0]     =  r0Left;
169   partubs[1]     =  r4Left;
170   partubs[2]     =  fThickness1/2.0;
171   partubs[3]     =  90.0-22.5;
172   partubs[4]     = 135.0-22.5;
173
174   gMC->Gsvolu("V0L0","TUBS",idtmed[3010],partubs,5);  // air volume
175   
176   Float_t  r1Left =  r0Left + height1Left;        
177      
178   partubs[0]     =  r0Left;
179   partubs[1]     =  r1Left;
180
181   gMC->Gsvolu("V0L1","TUBS",idtmed[3005],partubs,5);  // quartz volume
182   gMC->Gspos("V0L1",1,"V0L0", 0.0, 0.0 , 0.0, 0,"ONLY"); 
183
184   Float_t  r2Left  =  r1Left + height2Left;       
185   
186   partubs[0]     =  r1Left;
187   partubs[1]     =  r2Left;
188
189   gMC->Gsvolu("V0L2","TUBS",idtmed[3005],partubs,5);  // quartz volume
190   gMC->Gspos("V0L2",1,"V0L0", 0.0, 0.0 , 0.0, 0,"ONLY"); 
191   
192   Float_t  r3Left  =  r2Left + height3Left;       
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   partubs[0]     =  r3Left;
201   partubs[1]     =  r4Left;
202
203   gMC->Gsvolu("V0L4","TUBS",idtmed[3005],partubs,5);  // quartz volume
204   gMC->Gspos("V0L4",1,"V0L0", 0.0, 0.0 , 0.0, 0,"ONLY");  
205
206 // Creation of mother volume v0RI - right part - :
207   
208   partube[0] = r0Right - 0.2;
209   partube[1] = r4Right + 1.0;
210   partube[2] = fThickness/2.0; 
211       
212   gMC->Gsvolu("V0RI","TUBE",idtmed[3010],partube,3);
213   
214 // Creation of  carbon lids (3.0 mm thick) to keep v0RI box shut...
215
216   Float_t  lidThickness = 0.30;
217  
218   partube[0] =   r0Right;
219   partube[1] =   rBoxRight;
220   partube[2] =   +lidThickness/2.0;
221     
222   gMC->Gsvolu("V0CA","TUBE",idtmed[3001],partube,3); 
223   gMC->Gspos("V0CA",1,"V0RI",0.0,0.0, fThickness/2.0-partube[2],0,"ONLY");
224   gMC->Gspos("V0CA",2,"V0RI",0.0,0.0,-fThickness/2.0+partube[2],0,"ONLY");
225   
226 // Creation of aluminum rings 3.0 mm thick to maintain the v0RI pieces ...
227
228   partube[0] =   r0Right;
229   partube[1] =   r0Right + 0.3;
230   partube[2] =   +fThickness/2.0;
231    
232   gMC->Gsvolu("V0IR","TUBE",idtmed[3003],partube,3);    
233   gMC->Gspos("V0IR",1,"V0RI",0.0,0.0,0.0,0,"ONLY");
234
235   partube[0] =   rBoxRight - 0.3;
236   partube[1] =   rBoxRight;
237   partube[2] =   +fThickness/2.0;
238  
239   gMC->Gsvolu("V0ER","TUBE",idtmed[3003],partube,3);    
240   gMC->Gspos("V0ER",1,"V0RI",0.0,0.0,0.0,0,"ONLY");
241   
242 // Mother volume v0R0 in which will be set 6 scintillator cells 
243   
244   partubs[0]      =  r0Right;
245   partubs[1]      =  r4Right;
246   partubs[2]      =  fThickness/2.0;
247   partubs[3]      =  90.0-22.5;
248   partubs[4]      = 135.0-22.5;
249
250   gMC->Gsvolu("V0R0","TUBS",idtmed[3010],partubs,5);  // air volume 
251
252 // Elementary cell of ring 1 :
253 // (cells of ring 1 will be shifted by 2.0 cm backwards to output fibers)
254    
255   Float_t   offsetFibers  =  1.0;
256   Float_t   offset        =  fThickness/2.0 - lidThickness - fThickness1/2.0; 
257   Float_t   r1Right       =  r0Right + 0.3 + height1Right;
258       
259   partubs[0]     =  r0Right + 0.3;
260   partubs[1]     =  r1Right;
261   partubs[2]     =  fThickness1/2.0;
262   
263   gMC->Gsvolu("V0R1","TUBS",idtmed[3005],partubs,5);  // scintillator volume
264   gMC->Gspos("V0R1",1,"V0R0", 0.0, 0.0 , -offset, 0,"ONLY"); 
265
266 // Elementary cell of ring 2 :
267 // (cells of ring 2 will be shifted by 1.0 cm backwards to output fibers)
268
269   Float_t   r2Right   =  r1Right + height2Right;       
270   
271   partubs[0]     =  r1Right;
272   partubs[1]     =  r2Right;
273
274   gMC->Gsvolu("V0R2","TUBS",idtmed[3005],partubs,5);  // scintillator volume
275   gMC->Gspos("V0R2",1,"V0R0", 0.0, 0.0 , -offset + offsetFibers, 0,"ONLY"); 
276
277 // Elementary cell of ring 3 :
278
279   Float_t   r3Right   =  r2Right + height3Right;   
280      
281   partubs[0]     =  r2Right;
282   partubs[1]     =  r3Right;
283   partubs[3]     =  90.0-22.5;
284   partubs[4]     = 112.5-22.5;
285
286   gMC->Gsvolu("V0R3","TUBS",idtmed[3005],partubs,5);  // scintillator volume
287   gMC->Gspos("V0R3",1,"V0R0", 0.0, 0.0 , -offset + 2.0 * offsetFibers, 0,"ONLY");
288   
289   partubs[3]     = 112.5-22.5;
290   partubs[4]     = 135.0-22.5;
291   gMC->Gsvolu("V0R4","TUBS",idtmed[3005],partubs,5);  // scintillator volume
292   gMC->Gspos("V0R4",1,"V0R0", 0.0, 0.0 , -offset + 2.0 * offsetFibers, 0,"ONLY");
293   
294 // Elementary cell of ring 4 :
295    
296   partubs[0]     =  r3Right;
297   partubs[1]     =  r4Right;
298   partubs[3]     =  90.0-22.5;
299   partubs[4]     = 112.5-22.5;
300
301   gMC->Gsvolu("V0R5","TUBS",idtmed[3005],partubs,5);  // scintillator volume
302   gMC->Gspos("V0R5",1,"V0R0", 0.0, 0.0 , -offset + 2.0 * offsetFibers, 0,"ONLY");
303   
304   partubs[3]     = 112.5-22.5;
305   partubs[4]     = 135.0-22.5;
306   gMC->Gsvolu("V0R6","TUBS",idtmed[3005],partubs,5);  // scintillator volume
307   gMC->Gspos("V0R6",1,"V0R0", 0.0, 0.0 , -offset + 2.0 * offsetFibers, 0,"ONLY");
308     
309   Float_t  phiDeg = 180./4.; 
310
311 // Right part : 
312  
313   for(Float_t  phi = 22.5; phi < 360.0; phi = phi + phiDeg)
314       {        
315         AliMatrix(idrotm[902], 90.0, phi, 90.0, 90.0 +phi, 0.0 , 0.0);
316         gMC->Gspos("V0R0",ndetR,"V0RI",0.0,
317                           0.0,0.0,idrotm[902],"ONLY");
318         ndetR++;
319        }
320
321   gMC->Gspos("V0RI",1,"ALIC",0.0,0.0,-zdet,0,"ONLY");
322  
323   ncellsR = (ndetR - 1) * 6;  
324   AliInfo(Form("Number of cells on Right side =   %d\n",  ncellsR));
325
326 // Left part :
327   
328   for(Float_t  phi = 22.5; phi < 360.0; phi = phi + phiDeg)
329       {       
330         AliMatrix(idrotm[902], 90.0, phi, 90.0, 90.0 +phi, 0.0 , 0.0);
331         gMC->Gspos("V0L0",ndetL,"V0LE",0.0,
332                           0.0,0.0,idrotm[902],"ONLY");
333         ndetL++;
334        }
335
336   gMC->Gspos("V0LE",1,"ALIC",0.0,0.0,339.0+fThickness1/2.0,0,"ONLY");
337  
338   ncellsL = (ndetL - 1) * 4;
339   AliInfo(Form("Number of cells on Left side  =   %d\n",  ncellsL));    
340            
341 }
342             
343 //_____________________________________________________________________________
344 void AliVZEROv5::CreateMaterials()
345 {
346
347 // Creates materials used for geometry 
348
349     AliDebug(2,"Create materials");
350     
351 /*
352     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, 
353                            6.9e-9, 7.1e-9, 7.3e-9, 7.5e-9, 7.7e-9, 7.9e-9, 8.1e-9 };
354
355            
356     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, 
357                                6.9e-9, 7.1e-9, 7.3e-9, 7.5e-9, 7.7e-9, 7.9e-9, 8.1e-9 };
358                            
359     Float_t rindex_quarz[14] = { 1.52398,  1.53090, 1.53835, 1.54641, 1.55513, 1.56458, 
360                                  1.57488,  1.58611, 1.59842, 1.61197, 1.62696, 1.64362, 
361                                  1.662295, 1.68337 };
362                                  
363     Float_t absco_quarz[14] = { 105.8,  45.656, 35.665, 28.598, 25.007, 21.04, 17.525, 
364                                 14.177, 9.282, 4.0925, 1.149, 0.3627, 0.1497, 0.05 };   
365                                                                                         
366     Float_t effic_all[14]   = { 1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1. };
367     
368         
369     Float_t rindex_alu[14] = { 1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1. }; 
370     
371     
372     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,
373                                1e-4,1e-4,1e-4,1e-4 };
374     Float_t effic_alu[14]  = { 1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1. };
375
376 */        
377
378     Int_t *idtmed = fIdtmed->GetArray()-2999;
379     
380     
381 //  Parameters related to Quarz (SiO2) :
382  
383     Float_t aqua[2], zqua[2], densqua, wmatqua[2];
384     Int_t nlmatqua;
385     
386     aqua[0]    = 28.09;
387     aqua[1]    = 16.;
388     zqua[0]    = 14.;
389     zqua[1]    = 8.;
390     densqua    = 2.64;
391     nlmatqua   = -2;
392     wmatqua[0] = 1.;
393     wmatqua[1] = 2.;
394
395 // Parameters  related to aluminum sheets :
396     
397     Float_t  aal   = 26.98;
398     Float_t  zal   = 13.00; 
399     Float_t  densal=   2.7; 
400     Float_t  radlal=   8.9;
401        
402 // Parameters  related to scintillator CH :
403     
404     Float_t ascin[2] = {1.00794,12.011};
405     Float_t zscin[2] = {1.,6.};
406     Float_t wscin[2] = {1.,1.};
407     Float_t denscin  = 1.032;
408     
409 // AIR
410
411     Float_t aAir[4]={12.,14.,16.,36.};
412     Float_t zAir[4]={6.,7.,8.,18.};
413     Float_t wAir[4]={0.000124,0.755267,0.231781,0.012827};
414     Float_t dAir = 1.20479E-3;
415         
416 //  Definition of materials :
417        
418     AliMixture( 1, "AIR A$", aAir,zAir,dAir,4,wAir);
419     AliMixture(11, "AIR I$", aAir,zAir,dAir,4,wAir);
420     AliMaterial( 2, "CARBON$"  , 12.01, 6.0, 2.265, 18.8, 49.9, 0, 0);
421     AliMixture(  3, "QUA", aqua, zqua, densqua, nlmatqua, wmatqua);
422     AliMaterial( 4, "ALUMINIUM1$", 26.98, 13., 2.7, 8.9, 37.2, 0, 0);
423     AliMaterial( 5, "ALUMINIUM2$", aal, zal, densal, radlal, 0, 0, 0);
424  
425     AliMixture( 6, "Scintillator$",ascin,zscin,denscin,-2,wscin);
426     
427      
428     Int_t   iSXFLD = ((AliMagF*)TGeoGlobalMagField::Instance()->GetField())->Integ();     // Field type 
429     Float_t sXMGMX = ((AliMagF*)TGeoGlobalMagField::Instance()->GetField())->Max();       // Field max.
430     
431     Float_t tmaxfd, stemax, deemax, epsil, stmin;
432         
433     tmaxfd = 10.;
434     stemax = 0.1;
435     deemax = 0.1;     
436     epsil  = 0.001;
437     stmin  = 0.001;
438   
439 //  Active Air :    
440     AliMedium(1, "ACTIVE AIR$", 1, 1, iSXFLD, sXMGMX,
441               10.0, 1.0, 0.1, 0.1, 10.0, 0, 0) ;
442
443 //  Inactive air : 
444   
445     AliMedium(11, "INACTIVE AIR$", 11, 0, iSXFLD, sXMGMX,
446               10.0, 1.0, 0.1, 0.1, 10.0, 0, 0) ;
447     
448     AliMedium(2, "CARBON$ ", 2,  1, iSXFLD, sXMGMX,
449               tmaxfd, stemax, deemax, epsil, stmin, 0, 0);   
450
451     AliMedium(3, "QUARZ$", 3, 1, iSXFLD, sXMGMX,
452               tmaxfd, fMaxStepQua, fMaxDestepQua, epsil, stmin, 0, 0);
453     
454     AliMedium(4,"ALUMINUM1$",4, 1, iSXFLD, sXMGMX,
455               tmaxfd, fMaxStepAlu, fMaxDestepAlu, epsil, stmin, 0, 0);
456               
457
458     AliMedium(5,"ALUMINUM2$",5, 1, iSXFLD, sXMGMX,
459               tmaxfd, fMaxStepAlu, fMaxDestepAlu, epsil, stmin, 0, 0);    
460
461     AliMedium(6,"SCINTILLATOR$",6, 1, iSXFLD, sXMGMX, 10.0, 0.1, 0.1, 0.003, 0.003, 0, 0);
462
463     gMC->Gstpar(idtmed[3000], "LOSS", 1.);  //  [3000] = air ACTIF  [3010] = air INACTIF
464     gMC->Gstpar(idtmed[3000], "HADR", 1.);
465     gMC->Gstpar(idtmed[3000], "DCAY", 1.);
466     gMC->Gstpar(idtmed[3000], "DRAY", 1.);
467     
468     gMC->Gstpar(idtmed[3001], "LOSS", 1.);  //  [3001] = carbon
469     gMC->Gstpar(idtmed[3001], "HADR", 1.);
470     gMC->Gstpar(idtmed[3001], "DCAY", 1.);
471     gMC->Gstpar(idtmed[3001], "DRAY", 1.);
472
473     gMC->Gstpar(idtmed[3002], "LOSS", 1.);  //  [3002] = quartz
474     gMC->Gstpar(idtmed[3002], "HADR", 1.);
475     gMC->Gstpar(idtmed[3002], "DCAY", 1.);
476     gMC->Gstpar(idtmed[3002], "DRAY", 1.);  
477     gMC->Gstpar(idtmed[3002], "CUTGAM",0.5E-4) ; 
478     gMC->Gstpar(idtmed[3002], "CUTELE",1.0E-4) ;
479     
480     gMC->Gstpar(idtmed[3003], "LOSS", 1.);  //  [3003] = normal aluminum
481     gMC->Gstpar(idtmed[3003], "HADR", 1.);
482     gMC->Gstpar(idtmed[3003], "DCAY", 1.);
483     gMC->Gstpar(idtmed[3003], "DRAY", 1.);
484     
485     gMC->Gstpar(idtmed[3004], "LOSS", 1.);  //  [3004] = reflecting aluminum
486     gMC->Gstpar(idtmed[3004], "HADR", 1.);
487     gMC->Gstpar(idtmed[3004], "DCAY", 1.);
488     gMC->Gstpar(idtmed[3004], "DRAY", 1.);
489     gMC->Gstpar(idtmed[3004], "CUTGAM",0.5E-4) ; 
490     gMC->Gstpar(idtmed[3004], "CUTELE",1.0E-4) ;
491     
492     gMC->Gstpar(idtmed[3005], "LOSS", 1.);  //  [3005] = scintillator
493     gMC->Gstpar(idtmed[3005], "HADR", 1.);
494     gMC->Gstpar(idtmed[3005], "DCAY", 1.);
495     gMC->Gstpar(idtmed[3005], "DRAY", 1.); 
496     gMC->Gstpar(idtmed[3005], "CUTGAM",0.5E-4) ; 
497     gMC->Gstpar(idtmed[3005], "CUTELE",1.0E-4) ;
498       
499     
500 //    geant3->Gsckov(idtmed[3002], 14, ppckov, absco_quarz, effic_all,rindex_quarz);    
501 //    geant3->Gsckov(idtmed[3004], 14, ppckov_alu, absco_alu, effic_alu, rindex_alu);
502
503 //    gMC->SetCerenkov(idtmed[3002], 14, ppckov, absco_quarz, effic_all,rindex_quarz);    
504 //    gMC->SetCerenkov(idtmed[3004], 14, ppckov_alu, absco_alu, effic_alu, rindex_alu);
505                                        
506 }
507
508 //_____________________________________________________________________________
509 void AliVZEROv5::DrawModule() const
510 {
511
512 //  Drawing is done in DrawVZERO.C
513
514    AliDebug(2,"DrawModule");
515 }
516
517 //_____________________________________________________________________________
518 void AliVZEROv5::Init()
519 {
520 // Initialises version 2 of the VZERO Detector
521 // Just prints an information message
522   
523    AliInfo(Form("VZERO version %d initialized \n",IsVersion()));
524    
525 //   gMC->SetMaxStep(fMaxStepAlu);
526 //   gMC->SetMaxStep(fMaxStepQua);
527    
528     AliVZERO::Init();  
529 }
530
531 //_____________________________________________________________________________
532 void AliVZEROv5::StepManager()
533 {
534  
535 // Step Manager, called at each step 
536  
537      Int_t     copy;
538      static    Int_t   vol[4];
539      static    Float_t hits[21];
540      static    Float_t eloss, tlength;
541      static    Int_t   nPhotonsInStep;
542      static    Int_t   nPhotons; 
543      static    Int_t   numStep;
544      Float_t   ringNumber;
545      Float_t   destep, step;
546      
547      numStep += 1; 
548           
549 //   We keep only charged tracks :
550      
551      if ( !gMC->TrackCharge() || !gMC->IsTrackAlive() ) return; 
552
553      vol[0]    = gMC->CurrentVolOffID(1, vol[1]);
554      vol[2]    = gMC->CurrentVolID(copy);
555      vol[3]    = copy;
556      
557      static Int_t idV0R1 = gMC->VolId("V0R1");
558      static Int_t idV0L1 = gMC->VolId("V0L1");
559      static Int_t idV0R2 = gMC->VolId("V0R2");
560      static Int_t idV0L2 = gMC->VolId("V0L2");
561      static Int_t idV0R3 = gMC->VolId("V0R3");
562      static Int_t idV0L3 = gMC->VolId("V0L3");
563      static Int_t idV0R4 = gMC->VolId("V0R4");
564      static Int_t idV0L4 = gMC->VolId("V0L4");
565      static Int_t idV0R5 = gMC->VolId("V0R5");
566      static Int_t idV0R6 = gMC->VolId("V0R6");
567
568      if      ( gMC->CurrentVolID(copy) == idV0R1 ||
569                gMC->CurrentVolID(copy) == idV0L1 )
570                ringNumber = 1.0;
571      else if ( gMC->CurrentVolID(copy) == idV0R2 ||
572                gMC->CurrentVolID(copy) == idV0L2 ) 
573                ringNumber = 2.0;  
574      else if ( gMC->CurrentVolID(copy) == idV0R3 ||
575                gMC->CurrentVolID(copy) == idV0R4 ||
576                gMC->CurrentVolID(copy) == idV0L3 )
577                ringNumber = 3.0;
578      else if ( gMC->CurrentVolID(copy) == idV0R5 ||
579                gMC->CurrentVolID(copy) == idV0R6 ||
580                gMC->CurrentVolID(copy) == idV0L4 )
581                ringNumber = 4.0;               
582      else
583                ringNumber = 0.0;
584
585      if  (  ringNumber > 0.5  ) { 
586      
587         destep    = gMC->Edep();
588         step      = gMC->TrackStep();
589         
590         nPhotonsInStep  = Int_t(destep / (fLightYield *1e-9) ); 
591         nPhotonsInStep  = gRandom->Poisson(nPhotonsInStep);
592         
593         eloss    += destep;
594         tlength  += step;        
595         
596         if  ( gMC->IsTrackEntering()  )  { 
597          
598             nPhotons  =  nPhotonsInStep;       
599             gMC->TrackPosition(fTrackPosition);
600             gMC->TrackMomentum(fTrackMomentum);
601             
602             Float_t pt  = TMath::Sqrt( fTrackMomentum.Px() * fTrackMomentum.Px() +
603                                        fTrackMomentum.Py() * fTrackMomentum.Py() );
604                
605             hits[0]  = fTrackPosition.X();
606             hits[1]  = fTrackPosition.Y();
607             hits[2]  = fTrackPosition.Z();               
608             hits[3]  = Float_t (gMC->TrackPid()); 
609
610             hits[4]  = gMC->TrackTime();
611             hits[5]  = gMC->TrackCharge();
612             hits[6]  = fTrackMomentum.Theta()*TMath::RadToDeg();
613             hits[7]  = fTrackMomentum.Phi()*TMath::RadToDeg();
614             hits[8]  = ringNumber;
615          
616             hits[9]  = pt;
617             hits[10] = fTrackMomentum.P();
618             hits[11] = fTrackMomentum.Px();
619             hits[12] = fTrackMomentum.Py();
620             hits[13] = fTrackMomentum.Pz();
621             
622             TParticle *par = gAlice->GetMCApp()->Particle(gAlice->GetMCApp()->GetCurrentTrackNumber());
623             hits[14] = par->Vx();
624             hits[15] = par->Vy();
625             hits[16] = par->Vz();
626             
627             tlength  = 0.0;
628             eloss    = 0.0;         
629          }
630          
631          nPhotons  = nPhotons + nPhotonsInStep;
632          
633          if( gMC->IsTrackExiting() || gMC->IsTrackStop() || gMC->IsTrackDisappeared()){
634          
635          nPhotons  = nPhotons - Int_t((Float_t(nPhotons) * fLightAttenuation * fnMeters));       
636          nPhotons  = nPhotons - Int_t( Float_t(nPhotons) * fFibToPhot);  
637          
638          hits[17] =   eloss;
639          hits[18] = tlength;
640          hits[19] = nPhotons;
641          hits[20] = GetCellId (vol, hits); 
642                  
643          AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol, hits);
644                  
645          tlength         = 0.0;
646          eloss           = 0.0; 
647          nPhotons        =   0;
648          nPhotonsInStep  =   0;
649          
650          numStep         =   0;  
651          } 
652     }
653       
654 }
655
656 //_____________________________________________________________________________
657 void AliVZEROv5::AddHit(Int_t track, Int_t *vol, Float_t *hits)
658 {
659   
660 //  Adds a VZERO hit
661   
662   TClonesArray &lhits = *fHits;
663   new(lhits[fNhits++]) AliVZEROhit(fIshunt,track,vol,hits);
664 }
665
666 //_____________________________________________________________________________
667 void AliVZEROv5::AddDigits(Int_t *tracks, Int_t* digits) 
668 {
669
670 //  Adds a VZERO digit
671
672    TClonesArray  &ldigits = *fDigits;
673    new(ldigits[fNdigits++]) AliVZEROdigit(tracks, digits);
674 }
675
676 //_____________________________________________________________________________
677 void AliVZEROv5::MakeBranch(Option_t *option)
678 {
679   
680 // Creates new branches in the current Root Tree
681     
682   char branchname[10];
683   sprintf(branchname,"%s",GetName());
684   AliDebug(2,Form("fBufferSize = %d",fBufferSize));
685   
686   const char *cH = strstr(option,"H");
687   
688   if (fHits   && fLoader->TreeH() && cH) {
689     fLoader->TreeH()->Branch(branchname,&fHits, fBufferSize);
690     AliDebug(2,Form("Making Branch %s for hits",branchname));
691   }     
692
693   const char *cD = strstr(option,"D");
694   
695   if (fDigits   && fLoader->TreeD() && cD) {
696     fLoader->TreeD()->Branch(branchname,&fDigits, fBufferSize);
697     AliDebug(2,Form("Making Branch %s for digits",branchname));
698   }  
699    
700 }
701
702 //_____________________________________________________________________________
703 Int_t AliVZEROv5::GetCellId(Int_t *vol, Float_t *hits) 
704 {
705
706   //   Returns Id of scintillator cell
707   //   Right side from  0 to 47
708   //   Left  side from 48 to 95
709   
710   //   hits[8] = ring number (1 to 4)
711   //   vol[1]  = copy number (1 to 8)
712
713    Int_t index      = vol[1];
714    Int_t RingNumber = Int_t(hits[8]);   
715    fCellId          = 0;
716    
717 //    cout << "volID = " << vol[0] << "  copy = " << vol[1] << endl;
718 //    cout << "X     = " << hits[0] << "    Y = " << hits[1] << endl;
719    
720    Float_t phi = Float_t(TMath::ATan2(Double_t(hits[1]),Double_t(hits[0])) ); 
721    phi = kRaddeg * phi;
722     
723    if (index < 7) index = index + 8; 
724    
725    if (hits[2] < 0.0) { 
726       if(RingNumber < 3) {
727          index = (index - 7) + ( ( RingNumber - 1 ) * 8);}
728       else if(RingNumber >= 3){ 
729        if(gMC->CurrentVolID(vol[1]) == gMC->VolId("V0R3")|| 
730           gMC->CurrentVolID(vol[1]) == gMC->VolId("V0R5") ) 
731          {index = (index*2 - 14) + ( ( RingNumber - 2 ) * 16); }
732        if(gMC->CurrentVolID(vol[1]) == gMC->VolId("V0R4")||
733           gMC->CurrentVolID(vol[1]) == gMC->VolId("V0R6") ) 
734          {index = (index*2 - 13) + ( ( RingNumber - 2 ) * 16); }
735       }
736       fCellId   = index;           
737    }
738            
739    else if (hits[2] > 0.0){
740       index = (index - 7 + 48) + ( ( RingNumber - 1 ) * 8);
741       fCellId   = index;}
742              
743 //    cout << " ring   = " << RingNumber << " phi = "<<  phi << endl; 
744 //    cout << " cellID = " << fCellId <<  endl;
745 //    cout <<  "**********" << endl;         
746            
747    return fCellId;
748    
749    
750 }