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4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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14 **************************************************************************/
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
27 //*-- Author: Odd Harald Oddland & Gines Martinez (SUBATECH)
30 // --- ROOT system ---
33 // --- Standard library ---
38 #include <strstream.h>
40 // --- AliRoot header files ---
42 #include "AliPHOSv3.h"
43 #include "AliPHOSHit.h"
44 #include "AliPHOSDigit.h"
51 //____________________________________________________________________________
52 AliPHOSv3::AliPHOSv3(const char *name, const char *title):
57 // Number of electrons created in the PIN due to light collected in the PbWo4 crystal is calculated using
59 // NumberOfElectrons = EnergyLost * LightYield * PINEfficiency *
60 // exp (-LightYieldAttenuation * DistanceToPINdiodeFromTheHit) *
61 // RecalibrationFactor ;
62 // LightYield is obtained as a Poissonian distribution with a mean at 700000 photons per GeV fromValery Antonenko
63 // PINEfficiency is 0.1875 from Odd Harald Odland work
64 // k_0 is 0.0045 from Valery Antonenko
67 fLightYieldMean = 700000. ;
68 fIntrinsicPINEfficiency = 0.1875 ;
69 fLightYieldAttenuation = 0.0045 ;
70 fRecalibrationFactor = 6.2 / fLightYieldMean ;
71 fElectronsPerGeV = 2.77e+8 ;
74 //____________________________________________________________________________
75 AliPHOSv3::AliPHOSv3(AliPHOSReconstructioner * Reconstructioner, const char *name, const char *title):
76 AliPHOSv1(Reconstructioner,name,title)
80 // Number of electrons created in the PIN due to light collected in the PbWo4 crystal is calculated using
82 // NumberOfElectrons = EnergyLost * LightYield * PINEfficiency *
83 // exp (-LightYieldAttenuation * DistanceToPINdiodeFromTheHit) *
84 // RecalibrationFactor ;
85 // LightYield is obtained as a Poissonian distribution with a mean at 700000 photons per GeV fromValery Antonenko
86 // PINEfficiency is 0.1875 from Odd Harald Odland work
87 // k_0 is 0.0045 from Valery Antonenko
89 fLightYieldMean = 700000.;
90 fIntrinsicPINEfficiency = 0.1875 ;
91 fLightYieldAttenuation = 0.0045 ;
92 fRecalibrationFactor = 6.2 / fLightYieldMean ;
93 fElectronsPerGeV = 2.77e+8 ;
95 //____________________________________________________________________________
97 void AliPHOSv3::StepManager(void)
99 // Accumulates hits as long as the track stays in a single crystal or PPSD gas Cell
101 // if (gMC->IsTrackEntering())
102 // cout << "Track enters the volume " << gMC->CurrentVolName() << endl;
103 // if (gMC->IsTrackExiting())
104 // cout << "Track leaves the volume " << gMC->CurrentVolName() << endl;
106 Int_t relid[4] ; // (box, layer, row, column) indices
107 Int_t absid ; // absolute cell ID number
108 Float_t xyze[4]={0,0,0,0} ; // position wrt MRS and energy deposited
109 TLorentzVector pos ; // Lorentz vector of the track current position
112 Int_t tracknumber = gAlice->CurrentTrack() ;
113 Int_t primary = gAlice->GetPrimary( gAlice->CurrentTrack() );
114 TString name = fGeom->GetName() ;
117 if ( name == "GPS2" || name == "MIXT" ) { // ======> CPV is a GPS' PPSD
119 if( gMC->CurrentVolID(copy) == gMC->VolId("GCEL") ) // We are inside a gas cell
121 gMC->TrackPosition(pos) ;
125 xyze[3] = gMC->Edep() ;
127 if ( xyze[3] != 0) { // there is deposited energy
128 gMC->CurrentVolOffID(5, relid[0]) ; // get the PHOS Module number
129 if ( name == "MIXT" && strcmp(gMC->CurrentVolOffName(5),"PHO1") == 0 ){
130 relid[0] += fGeom->GetNModules() - fGeom->GetNPPSDModules();
132 gMC->CurrentVolOffID(3, relid[1]) ; // get the Micromegas Module number
133 // 1-> fGeom->GetNumberOfModulesPhi() * fGeom->GetNumberOfModulesZ() upper
134 // > fGeom->GetNumberOfModulesPhi() * fGeom->GetNumberOfModulesZ() lower
135 gMC->CurrentVolOffID(1, relid[2]) ; // get the row number of the cell
136 gMC->CurrentVolID(relid[3]) ; // get the column number
138 // get the absolute Id number
140 fGeom->RelToAbsNumbering(relid, absid) ;
142 // add current hit to the hit list
143 AddHit(fIshunt, primary, tracknumber, absid, xyze);
146 } // there is deposited energy
147 } // We are inside the gas of the CPV
148 } // GPS2 configuration
150 if ( name == "IHEP" || name == "MIXT" ) { // ======> CPV is a IHEP's one
152 // Yuri Kharlov, 28 September 2000
154 if( gMC->CurrentVolID(copy) == gMC->VolId("CPVQ") &&
155 gMC->IsTrackEntering() &&
156 gMC->TrackCharge() != 0) {
158 gMC -> TrackPosition(pos);
159 Float_t xyzm[3], xyzd[3] ;
161 for (i=0; i<3; i++) xyzm[i] = pos[i];
162 gMC -> Gmtod (xyzm, xyzd, 1); // transform coordinate from master to daughter system
164 Float_t xyd[3]={0,0,0} ; //local posiiton of the entering
170 // Current momentum of the hit's track in the local ref. system
171 TLorentzVector pmom ; //momentum of the particle initiated hit
172 gMC -> TrackMomentum(pmom);
173 Float_t pm[3], pd[3];
174 for (i=0; i<3; i++) pm[i] = pmom[i];
175 gMC -> Gmtod (pm, pd, 2); // transform 3-momentum from master to daughter system
180 // Digitize the current CPV hit:
182 // 1. find pad response and
185 gMC->CurrentVolOffID(3,moduleNumber);
189 TClonesArray *cpvDigits = new TClonesArray("AliPHOSCPVDigit",0); // array of digits for current hit
190 CPVDigitize(pmom,xyd,moduleNumber,cpvDigits);
195 Int_t idigit,ndigits;
197 // 2. go through the current digit list and sum digits in pads
199 ndigits = cpvDigits->GetEntriesFast();
200 for (idigit=0; idigit<ndigits-1; idigit++) {
201 AliPHOSCPVDigit *cpvDigit1 = (AliPHOSCPVDigit*) cpvDigits->UncheckedAt(idigit);
202 Float_t x1 = cpvDigit1->GetXpad() ;
203 Float_t z1 = cpvDigit1->GetYpad() ;
204 for (Int_t jdigit=idigit+1; jdigit<ndigits; jdigit++) {
205 AliPHOSCPVDigit *cpvDigit2 = (AliPHOSCPVDigit*) cpvDigits->UncheckedAt(jdigit);
206 Float_t x2 = cpvDigit2->GetXpad() ;
207 Float_t z2 = cpvDigit2->GetYpad() ;
208 if (x1==x2 && z1==z2) {
209 Float_t qsum = cpvDigit1->GetQpad() + cpvDigit2->GetQpad() ;
210 cpvDigit2->SetQpad(qsum) ;
211 cpvDigits->RemoveAt(idigit) ;
215 cpvDigits->Compress() ;
217 // 3. add digits to temporary hit list fTmpHits
219 ndigits = cpvDigits->GetEntriesFast();
220 for (idigit=0; idigit<ndigits; idigit++) {
221 AliPHOSCPVDigit *cpvDigit = (AliPHOSCPVDigit*) cpvDigits->UncheckedAt(idigit);
222 relid[0] = moduleNumber + 1 ; // CPV (or PHOS) module number
223 relid[1] =-1 ; // means CPV
224 relid[2] = cpvDigit->GetXpad() ; // column number of a pad
225 relid[3] = cpvDigit->GetYpad() ; // row number of a pad
227 // get the absolute Id number
228 fGeom->RelToAbsNumbering(relid, absid) ;
230 // add current digit to the temporary hit list
234 xyze[3] = cpvDigit->GetQpad() ; // amplitude in a pad
235 primary = -1; // No need in primary for CPV
236 AddHit(fIshunt, primary, tracknumber, absid, xyze);
238 if (cpvDigit->GetQpad() > 0.02) {
239 xmean += cpvDigit->GetQpad() * (cpvDigit->GetXpad() + 0.5);
240 zmean += cpvDigit->GetQpad() * (cpvDigit->GetYpad() + 0.5);
241 qsum += cpvDigit->GetQpad();
246 } // end of IHEP configuration
249 if(gMC->CurrentVolID(copy) == gMC->VolId("PXTL") ) { // We are inside a PBWO crystal
250 gMC->TrackPosition(pos) ;
254 xyze[3] = gMC->Edep() ;
257 if ( (xyze[3] != 0) ) { // Track is inside the crystal and deposits some energy
259 gMC->CurrentVolOffID(10, relid[0]) ; // get the PHOS module number ;
261 if ( name == "MIXT" && strcmp(gMC->CurrentVolOffName(10),"PHO1") == 0 )
262 relid[0] += fGeom->GetNModules() - fGeom->GetNPPSDModules();
264 relid[1] = 0 ; // means PBW04
265 gMC->CurrentVolOffID(4, relid[2]) ; // get the row number inside the module
266 gMC->CurrentVolOffID(3, relid[3]) ; // get the cell number inside the module
268 // get the absolute Id number
269 fGeom->RelToAbsNumbering(relid, absid) ;
271 // add current hit to the hit list
272 AddHit(fIshunt, primary,tracknumber, absid, xyze);
275 } // there is deposited energy
276 } // we are inside a PHOS Xtal
278 if(gMC->CurrentVolID(copy) == gMC->VolId("PPIN") ) // We are inside de PIN diode
280 gMC->TrackPosition(pos) ;
284 Float_t lostenergy = gMC->Edep() ;
285 xyze[3] = gMC->Edep() ;
287 if ( xyze[3] != 0 ) {
288 gMC->CurrentVolOffID(11, relid[0]) ; // get the PHOS module number ;
289 relid[1] = 0 ; // means PW04 and PIN
290 gMC->CurrentVolOffID(5, relid[2]) ; // get the row number inside the module
291 gMC->CurrentVolOffID(4, relid[3]) ; // get the cell number inside the module
293 // get the absolute Id number
296 fGeom->RelToAbsNumbering(relid,absid) ;
298 // calculating number of electrons in the PIN diode asociated to this hit
299 Float_t nElectrons = lostenergy * fElectronsPerGeV ;
300 xyze[3] = nElectrons * fRecalibrationFactor ;
302 // add current hit to the hit list
303 AddHit(fIshunt, primary, tracknumber, absid, xyze);
304 //printf("PIN volume is %d, %d, %d, %d \n",relid[0],relid[1],relid[2],relid[3]);
305 //printf("Lost energy in the PIN is %f \n",lostenergy) ;
306 } // there is deposited energy
307 } // we are inside a PHOS XtalPHOS PIN diode