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5f20d3fb | 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 | /* $Id$ */ | |
17 | ||
18 | //_________________________________________________________________________ | |
19 | // Implementation version v0 of PHOS Manager class | |
20 | // Layout EMC + PPSD has name GPS2 | |
21 | // The main goal of this version of AliPHOS is to calculte the | |
22 | // induced charged in the PIN diode, taking into account light | |
23 | // tracking in the PbWO4 crystal, induced signal in the | |
24 | // PIN due to MIPS particle and electronic noise. | |
25 | // This is done in the StepManager | |
26 | // | |
27 | //*-- Author: Odd Harald Oddland & Gines Martinez (SUBATECH) | |
28 | ||
29 | ||
30 | // --- ROOT system --- | |
31 | #include "TRandom.h" | |
32 | ||
33 | // --- Standard library --- | |
34 | ||
35 | #include <stdio.h> | |
36 | #include <string.h> | |
37 | #include <stdlib.h> | |
38 | #include <strstream.h> | |
39 | ||
40 | // --- AliRoot header files --- | |
41 | ||
42 | #include "AliPHOSv3.h" | |
43 | #include "AliPHOSHit.h" | |
44 | #include "AliPHOSDigit.h" | |
45 | #include "AliRun.h" | |
46 | #include "AliConst.h" | |
47 | ||
48 | ClassImp(AliPHOSv3) | |
49 | ||
50 | //____________________________________________________________________________ | |
51 | AliPHOSv3::AliPHOSv3(const char *name, const char *title): | |
52 | AliPHOSv1(name,title) | |
53 | { | |
54 | // ctor | |
55 | ||
56 | // Number of electrons created in the PIN due to light collected in the PbWo4 crystal is calculated using | |
57 | // following formula | |
58 | // NumberOfElectrons = EnergyLost * LightYield * PINEfficiency * | |
59 | // exp (-LightYieldAttenuation * DistanceToPINdiodeFromTheHit) * | |
60 | // RecalibrationFactor ; | |
61 | // LightYield is obtained as a Poissonian distribution with a mean at 700000 photons per GeV fromValery Antonenko | |
62 | // PINEfficiency is 0.1875 from Odd Harald Odland work | |
63 | // k_0 is 0.0045 from Valery Antonenko | |
64 | ||
65 | fLightYieldMean = 700000. ; | |
66 | fIntrinsicPINEfficiency = 0.1875 ; | |
67 | fLightYieldAttenuation = 0.0045 ; | |
68 | fRecalibrationFactor = 6.2 / fLightYieldMean ; | |
69 | fElectronsPerGeV = 2.77e+8 ; | |
70 | } | |
71 | ||
72 | //____________________________________________________________________________ | |
73 | AliPHOSv3::AliPHOSv3(AliPHOSReconstructioner * Reconstructioner, const char *name, const char *title): | |
74 | AliPHOSv1(Reconstructioner,name,title) | |
75 | { | |
76 | // ctor | |
77 | ||
78 | // Number of electrons created in the PIN due to light collected in the PbWo4 crystal is calculated using | |
79 | // following formula | |
80 | // NumberOfElectrons = EnergyLost * LightYield * PINEfficiency * | |
81 | // exp (-LightYieldAttenuation * DistanceToPINdiodeFromTheHit) * | |
82 | // RecalibrationFactor ; | |
83 | // LightYield is obtained as a Poissonian distribution with a mean at 700000 photons per GeV fromValery Antonenko | |
84 | // PINEfficiency is 0.1875 from Odd Harald Odland work | |
85 | // k_0 is 0.0045 from Valery Antonenko | |
86 | ||
87 | fLightYieldMean = 700000.; | |
88 | fIntrinsicPINEfficiency = 0.1875 ; | |
89 | fLightYieldAttenuation = 0.0045 ; | |
90 | fRecalibrationFactor = 6.2 / fLightYieldMean ; | |
91 | fElectronsPerGeV = 2.77e+8 ; | |
92 | } | |
93 | ||
94 | //____________________________________________________________________________ | |
95 | void AliPHOSv3::StepManager(void) | |
96 | { | |
97 | // Accumulates hits as long as the track stays in a single crystal or PPSD gas Cell | |
98 | // Adds the energy deposited in the PIN diode | |
99 | ||
100 | Int_t relid[4] ; // (box, layer, row, column) indices | |
101 | Float_t xyze[4] ; // position wrt MRS and energy deposited | |
102 | TLorentzVector pos ; | |
103 | Int_t copy; | |
104 | Float_t lightyield ; // Light Yield per GeV | |
105 | Float_t nElectrons ; // Number of electrons in the PIN diode | |
106 | TString name = fGeom->GetName() ; | |
107 | Float_t global[3] ; | |
108 | Float_t local[3] ; | |
109 | Float_t lostenergy ; | |
110 | ||
111 | Int_t tracknumber = gAlice->CurrentTrack() ; | |
112 | Int_t primary = gAlice->GetPrimary( gAlice->CurrentTrack() ); | |
113 | ||
114 | if ( name == "GPS2" ) { // the CPV is a PPSD | |
115 | if( gMC->CurrentVolID(copy) == gMC->VolId("GCEL") ) // We are inside a gas cell | |
116 | { | |
117 | gMC->TrackPosition(pos) ; | |
118 | xyze[0] = pos[0] ; | |
119 | xyze[1] = pos[1] ; | |
120 | xyze[2] = pos[2] ; | |
121 | xyze[3] = gMC->Edep() ; | |
122 | ||
123 | ||
124 | if ( xyze[3] != 0 ) { // there is deposited energy | |
125 | gMC->CurrentVolOffID(5, relid[0]) ; // get the PHOS Module number | |
126 | gMC->CurrentVolOffID(3, relid[1]) ; // get the Micromegas Module number | |
127 | // 1-> Geom->GetNumberOfModulesPhi() * fGeom->GetNumberOfModulesZ() upper | |
128 | // > fGeom->GetNumberOfModulesPhi() * fGeom->GetNumberOfModulesZ() lower | |
129 | gMC->CurrentVolOffID(1, relid[2]) ; // get the row number of the cell | |
130 | gMC->CurrentVolID(relid[3]) ; // get the column number | |
131 | ||
132 | // get the absolute Id number | |
133 | ||
134 | Int_t absid ; | |
135 | fGeom->RelToAbsNumbering(relid,absid) ; | |
136 | ||
137 | ||
138 | AddHit(fIshunt, primary, tracknumber, absid, xyze); | |
139 | ||
140 | } // there is deposited energy | |
141 | } // We are inside the gas of the CPV | |
142 | } // GPS2 configuration | |
143 | ||
144 | if(gMC->CurrentVolID(copy) == gMC->VolId("PXTL") )// We are inside a PBWO crystal | |
145 | { | |
146 | gMC->TrackPosition(pos) ; | |
147 | xyze[0] = pos[0] ; | |
148 | xyze[1] = pos[1] ; | |
149 | xyze[2] = pos[2] ; | |
150 | lostenergy = gMC->Edep() ; | |
151 | xyze[3] = gMC->Edep() ; | |
152 | ||
153 | global[0] = pos[0] ; | |
154 | global[1] = pos[1] ; | |
155 | global[2] = pos[2] ; | |
156 | ||
157 | if ( xyze[3] != 0 ) { | |
158 | gMC->CurrentVolOffID(10, relid[0]) ; // get the PHOS module number ; | |
159 | relid[1] = 0 ; // means PW04 | |
160 | gMC->CurrentVolOffID(4, relid[2]) ; // get the row number inside the module | |
161 | gMC->CurrentVolOffID(3, relid[3]) ; // get the cell number inside the module | |
162 | ||
163 | // get the absolute Id number | |
164 | ||
165 | Int_t absid ; | |
166 | fGeom->RelToAbsNumbering(relid,absid) ; | |
167 | gMC->Gmtod(global, local, 1) ; | |
168 | ||
169 | // calculating number of electrons in the PIN diode asociated to this hit | |
170 | lightyield = gRandom->Poisson(fLightYieldMean) ; | |
171 | nElectrons = lostenergy * lightyield * fIntrinsicPINEfficiency * | |
172 | exp(-fLightYieldAttenuation * (local[1]+fGeom->GetCrystalSize(1)/2.0 ) ) ; | |
173 | ||
174 | xyze[3] = nElectrons * fRecalibrationFactor ; | |
175 | // add current hit to the hit list | |
176 | AddHit(fIshunt, primary, tracknumber, absid, xyze); | |
177 | ||
178 | } // there is deposited energy | |
179 | } // we are inside a PHOS Xtal | |
180 | ||
181 | if(gMC->CurrentVolID(copy) == gMC->VolId("PPIN") ) // We are inside de PIN diode | |
182 | { | |
183 | gMC->TrackPosition(pos) ; | |
184 | xyze[0] = pos[0] ; | |
185 | xyze[1] = pos[1] ; | |
186 | xyze[2] = pos[2] ; | |
187 | lostenergy = gMC->Edep() ; | |
188 | xyze[3] = gMC->Edep() ; | |
189 | ||
190 | if ( xyze[3] != 0 ) { | |
191 | gMC->CurrentVolOffID(11, relid[0]) ; // get the PHOS module number ; | |
192 | relid[1] = 0 ; // means PW04 and PIN | |
193 | gMC->CurrentVolOffID(5, relid[2]) ; // get the row number inside the module | |
194 | gMC->CurrentVolOffID(4, relid[3]) ; // get the cell number inside the module | |
195 | ||
196 | // get the absolute Id number | |
197 | ||
198 | Int_t absid ; | |
199 | fGeom->RelToAbsNumbering(relid,absid) ; | |
200 | ||
201 | // calculating number of electrons in the PIN diode asociated to this hit | |
202 | nElectrons = lostenergy * fElectronsPerGeV ; | |
203 | xyze[3] = nElectrons * fRecalibrationFactor ; | |
204 | ||
205 | // add current hit to the hit list | |
206 | AddHit(fIshunt, primary, tracknumber, absid, xyze); | |
207 | //printf("PIN volume is %d, %d, %d, %d \n",relid[0],relid[1],relid[2],relid[3]); | |
208 | //printf("Lost energy in the PIN is %f \n",lostenergy) ; | |
209 | } // there is deposited energy | |
210 | } // we are inside a PHOS XtalPHOS PIN diode | |
211 | } |