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7587f5a5 | 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 | ||
b2a60966 | 16 | /* $Id$ */ |
5f20d3fb | 17 | |
702ab87e | 18 | /* History of cvs commits: |
19 | * | |
20 | * $Log$ | |
43fbaae1 | 21 | * Revision 1.104 2005/05/28 14:19:05 schutz |
22 | * Compilation warnings fixed by T.P. | |
23 | * | |
702ab87e | 24 | */ |
25 | ||
7587f5a5 | 26 | //_________________________________________________________________________ |
5f20d3fb | 27 | // Implementation version v1 of PHOS Manager class |
a3dfe79c | 28 | //--- |
a3dfe79c | 29 | //--- |
30 | // Layout EMC + CPV has name IHEP: | |
ed4205d8 | 31 | // Produces hits for CPV, cumulated hits |
32 | //--- | |
ed4205d8 | 33 | //--- |
5f20d3fb | 34 | //*-- Author: Yves Schutz (SUBATECH) |
b2a60966 | 35 | |
7587f5a5 | 36 | |
37 | // --- ROOT system --- | |
88cb7938 | 38 | #include <TParticle.h> |
88cb7938 | 39 | #include <TVirtualMC.h> |
7587f5a5 | 40 | |
41 | // --- Standard library --- | |
42 | ||
88cb7938 | 43 | |
7587f5a5 | 44 | // --- AliRoot header files --- |
97cee223 | 45 | #include "AliPHOSCPVDigit.h" |
97cee223 | 46 | #include "AliPHOSGeometry.h" |
88cb7938 | 47 | #include "AliPHOSHit.h" |
88cb7938 | 48 | #include "AliPHOSv1.h" |
49 | #include "AliRun.h" | |
5d12ce38 | 50 | #include "AliMC.h" |
7587f5a5 | 51 | |
52 | ClassImp(AliPHOSv1) | |
53 | ||
bea63bea | 54 | //____________________________________________________________________________ |
02ab1add | 55 | AliPHOSv1::AliPHOSv1(): |
43fbaae1 | 56 | fLightYieldMean(0.), |
57 | fIntrinsicPINEfficiency(0.), | |
58 | fLightYieldAttenuation(0.), | |
59 | fRecalibrationFactor(0.), | |
60 | fElectronsPerGeV(0.), | |
61 | fAPDGain(0.), | |
62 | fLightFactor(0.), | |
63 | fAPDFactor(0.) | |
bea63bea | 64 | { |
43fbaae1 | 65 | //Def ctor. |
bea63bea | 66 | } |
67 | ||
7587f5a5 | 68 | //____________________________________________________________________________ |
69 | AliPHOSv1::AliPHOSv1(const char *name, const char *title): | |
43fbaae1 | 70 | AliPHOSv0(name,title), |
71 | fLightYieldMean(0.), | |
72 | fIntrinsicPINEfficiency(0.), | |
73 | fLightYieldAttenuation(0.), | |
74 | fRecalibrationFactor(0.), | |
75 | fElectronsPerGeV(0.), | |
76 | fAPDGain(0.), | |
77 | fLightFactor(0.), | |
78 | fAPDFactor(0.) | |
7587f5a5 | 79 | { |
5f20d3fb | 80 | // |
ed4205d8 | 81 | // We store hits : |
5f20d3fb | 82 | // - fHits (the "normal" one), which retains the hits associated with |
83 | // the current primary particle being tracked | |
84 | // (this array is reset after each primary has been tracked). | |
85 | // | |
fa412d9b | 86 | |
037cc66d | 87 | |
5f20d3fb | 88 | |
89 | // We do not want to save in TreeH the raw hits | |
90 | // But save the cumulated hits instead (need to create the branch myself) | |
91 | // It is put in the Digit Tree because the TreeH is filled after each primary | |
7b326aac | 92 | // and the TreeD at the end of the event (branch is set in FinishEvent() ). |
5f20d3fb | 93 | |
ed4205d8 | 94 | fHits= new TClonesArray("AliPHOSHit",1000) ; |
5d12ce38 | 95 | gAlice->GetMCApp()->AddHitList(fHits) ; |
5f20d3fb | 96 | |
ed4205d8 | 97 | fNhits = 0 ; |
5f20d3fb | 98 | |
f6d1e5e1 | 99 | fIshunt = 2 ; // All hits are associated with primary particles |
7b326aac | 100 | |
9688c1dd | 101 | //Photoelectron statistics: |
102 | // The light yield is a poissonian distribution of the number of | |
103 | // photons created in the PbWo4 crystal, calculated using following formula | |
104 | // NumberOfPhotons = EnergyLost * LightYieldMean* APDEfficiency * | |
105 | // exp (-LightYieldAttenuation * DistanceToPINdiodeFromTheHit); | |
106 | // LightYieldMean is parameter calculated to be over 47000 photons per GeV | |
107 | // APDEfficiency is 0.02655 | |
108 | // k_0 is 0.0045 from Valery Antonenko | |
109 | // The number of electrons created in the APD is | |
110 | // NumberOfElectrons = APDGain * LightYield | |
111 | // The APD Gain is 300 | |
112 | fLightYieldMean = 47000; | |
113 | fIntrinsicPINEfficiency = 0.02655 ; //APD= 0.1875/0.1271 * 0.018 (PIN) | |
27f33ee5 | 114 | fLightYieldAttenuation = 0.0045 ; |
115 | fRecalibrationFactor = 13.418/ fLightYieldMean ; | |
116 | fElectronsPerGeV = 2.77e+8 ; | |
117 | fAPDGain = 300. ; | |
118 | fLightFactor = fLightYieldMean * fIntrinsicPINEfficiency ; | |
184569b0 | 119 | fAPDFactor = (fRecalibrationFactor/100.) * fAPDGain ; |
5f20d3fb | 120 | } |
121 | ||
43fbaae1 | 122 | AliPHOSv1::AliPHOSv1(AliPHOSv1 & phos) : |
123 | AliPHOSv0(phos), | |
124 | fLightYieldMean(0.), | |
125 | fIntrinsicPINEfficiency(0.), | |
126 | fLightYieldAttenuation(0.), | |
127 | fRecalibrationFactor(0.), | |
128 | fElectronsPerGeV(0.), | |
129 | fAPDGain(0.), | |
130 | fLightFactor(0.), | |
131 | fAPDFactor(0.) | |
132 | { | |
133 | //Copy ctor. Can be wrong. | |
134 | phos.Copy(*this) ; | |
135 | } | |
136 | ||
137 | ||
7587f5a5 | 138 | //____________________________________________________________________________ |
bea63bea | 139 | AliPHOSv1::~AliPHOSv1() |
b2a60966 | 140 | { |
bea63bea | 141 | // dtor |
88cb7938 | 142 | if ( fHits) { |
ed4205d8 | 143 | fHits->Delete() ; |
144 | delete fHits ; | |
145 | fHits = 0 ; | |
184569b0 | 146 | } |
7587f5a5 | 147 | } |
148 | ||
780fda6d | 149 | //____________________________________________________________________________ |
702ab87e | 150 | void AliPHOSv1::Copy(TObject & base)const |
780fda6d | 151 | { |
702ab87e | 152 | TObject::Copy(base) ; |
153 | AliPHOSv0::Copy(base) ; | |
154 | AliPHOSv1 &phos = static_cast<AliPHOSv1 &>(base); | |
780fda6d | 155 | phos.fLightYieldMean = fLightYieldMean ; |
156 | phos.fIntrinsicPINEfficiency = fIntrinsicPINEfficiency ; | |
157 | phos.fLightYieldAttenuation = fLightYieldAttenuation ; | |
158 | phos.fRecalibrationFactor = fRecalibrationFactor ; | |
159 | phos.fElectronsPerGeV = fElectronsPerGeV ; | |
160 | phos.fAPDGain = fAPDGain ; | |
161 | phos.fLightFactor = fLightFactor ; | |
162 | phos.fAPDFactor = fAPDFactor ; | |
163 | } | |
164 | ||
7587f5a5 | 165 | //____________________________________________________________________________ |
2af5445a | 166 | void AliPHOSv1::AddHit(Int_t shunt, Int_t primary, Int_t Id, Float_t * hits) |
bea63bea | 167 | { |
168 | // Add a hit to the hit list. | |
f6d1e5e1 | 169 | // A PHOS hit is the sum of all hits in a single crystal from one primary and within some time gate |
bea63bea | 170 | |
5f20d3fb | 171 | Int_t hitCounter ; |
bea63bea | 172 | AliPHOSHit *newHit ; |
5f20d3fb | 173 | AliPHOSHit *curHit ; |
174 | Bool_t deja = kFALSE ; | |
fa7cce36 | 175 | AliPHOSGeometry * geom = GetGeometry() ; |
bea63bea | 176 | |
2af5445a | 177 | newHit = new AliPHOSHit(shunt, primary, Id, hits) ; |
bea63bea | 178 | |
7854a24a | 179 | for ( hitCounter = fNhits-1 ; hitCounter >= 0 && !deja ; hitCounter-- ) { |
29b077b5 | 180 | curHit = dynamic_cast<AliPHOSHit*>((*fHits)[hitCounter]) ; |
9688c1dd | 181 | if(curHit->GetPrimary() != primary) break ; |
182 | // We add hits with the same primary, while GEANT treats primaries succesively | |
ed4205d8 | 183 | if( *curHit == *newHit ) { |
f15a01eb | 184 | *curHit + *newHit ; |
ed4205d8 | 185 | deja = kTRUE ; |
5f20d3fb | 186 | } |
187 | } | |
188 | ||
189 | if ( !deja ) { | |
ed4205d8 | 190 | new((*fHits)[fNhits]) AliPHOSHit(*newHit) ; |
7b326aac | 191 | // get the block Id number |
9688c1dd | 192 | Int_t relid[4] ; |
fa7cce36 | 193 | geom->AbsToRelNumbering(Id, relid) ; |
184569b0 | 194 | |
ed4205d8 | 195 | fNhits++ ; |
5f20d3fb | 196 | } |
184569b0 | 197 | |
bea63bea | 198 | delete newHit; |
bea63bea | 199 | } |
200 | ||
7b326aac | 201 | //____________________________________________________________________________ |
202 | void AliPHOSv1::FinishPrimary() | |
203 | { | |
204 | // called at the end of each track (primary) by AliRun | |
205 | // hits are reset for each new track | |
206 | // accumulate the total hit-multiplicity | |
7b326aac | 207 | |
208 | } | |
209 | ||
210 | //____________________________________________________________________________ | |
211 | void AliPHOSv1::FinishEvent() | |
212 | { | |
213 | // called at the end of each event by AliRun | |
214 | // accumulate the hit-multiplicity and total energy per block | |
215 | // if the values have been updated check it | |
88cb7938 | 216 | |
88cb7938 | 217 | AliDetector::FinishEvent(); |
7b326aac | 218 | } |
5f20d3fb | 219 | //____________________________________________________________________________ |
7587f5a5 | 220 | void AliPHOSv1::StepManager(void) |
221 | { | |
9688c1dd | 222 | // Accumulates hits as long as the track stays in a single crystal or CPV gas Cell |
b2a60966 | 223 | |
4f5bbbd4 | 224 | Int_t relid[4] ; // (box, layer, row, column) indices |
225 | Int_t absid ; // absolute cell ID number | |
471193a8 | 226 | Float_t xyzte[5]={-1000.,-1000.,-1000.,0.,0.} ; // position wrt MRS, time and energy deposited |
4f5bbbd4 | 227 | TLorentzVector pos ; // Lorentz vector of the track current position |
fa412d9b | 228 | Int_t copy ; |
7587f5a5 | 229 | |
fa7cce36 | 230 | TString name = GetGeometry()->GetName() ; |
037cc66d | 231 | |
9688c1dd | 232 | Int_t moduleNumber ; |
233 | ||
d6fb41ac | 234 | static Int_t idPCPQ = gMC->VolId("PCPQ"); |
235 | if( gMC->CurrentVolID(copy) == idPCPQ && | |
9688c1dd | 236 | (gMC->IsTrackEntering() ) && |
237 | gMC->TrackCharge() != 0) { | |
f6d1e5e1 | 238 | |
9688c1dd | 239 | gMC -> TrackPosition(pos); |
f6d1e5e1 | 240 | |
9688c1dd | 241 | Float_t xyzm[3], xyzd[3] ; |
242 | Int_t i; | |
243 | for (i=0; i<3; i++) xyzm[i] = pos[i]; | |
244 | gMC -> Gmtod (xyzm, xyzd, 1); // transform coordinate from master to daughter system | |
245 | ||
e3daf02c | 246 | Float_t xyd[3]={0,0,0} ; //local position of the entering |
9688c1dd | 247 | xyd[0] = xyzd[0]; |
53e03a1e | 248 | xyd[1] =-xyzd[2]; |
249 | xyd[2] =-xyzd[1]; | |
f6d1e5e1 | 250 | |
9688c1dd | 251 | // Current momentum of the hit's track in the local ref. system |
252 | TLorentzVector pmom ; //momentum of the particle initiated hit | |
253 | gMC -> TrackMomentum(pmom); | |
254 | Float_t pm[3], pd[3]; | |
255 | for (i=0; i<3; i++) | |
256 | pm[i] = pmom[i]; | |
f6d1e5e1 | 257 | |
9688c1dd | 258 | gMC -> Gmtod (pm, pd, 2); // transform 3-momentum from master to daughter system |
259 | pmom[0] = pd[0]; | |
cf75bc19 | 260 | pmom[1] =-pd[1]; |
261 | pmom[2] =-pd[2]; | |
f6d1e5e1 | 262 | |
9688c1dd | 263 | // Digitize the current CPV hit: |
264 | ||
265 | // 1. find pad response and | |
266 | gMC->CurrentVolOffID(3,moduleNumber); | |
267 | moduleNumber--; | |
268 | ||
269 | TClonesArray *cpvDigits = new TClonesArray("AliPHOSCPVDigit",0); // array of digits for current hit | |
90cceaf6 | 270 | CPVDigitize(pmom,xyd,cpvDigits); |
fa412d9b | 271 | |
9688c1dd | 272 | Float_t xmean = 0; |
273 | Float_t zmean = 0; | |
274 | Float_t qsum = 0; | |
275 | Int_t idigit,ndigits; | |
276 | ||
277 | // 2. go through the current digit list and sum digits in pads | |
278 | ||
279 | ndigits = cpvDigits->GetEntriesFast(); | |
280 | for (idigit=0; idigit<ndigits-1; idigit++) { | |
29b077b5 | 281 | AliPHOSCPVDigit *cpvDigit1 = dynamic_cast<AliPHOSCPVDigit*>(cpvDigits->UncheckedAt(idigit)); |
9688c1dd | 282 | Float_t x1 = cpvDigit1->GetXpad() ; |
283 | Float_t z1 = cpvDigit1->GetYpad() ; | |
284 | for (Int_t jdigit=idigit+1; jdigit<ndigits; jdigit++) { | |
29b077b5 | 285 | AliPHOSCPVDigit *cpvDigit2 = dynamic_cast<AliPHOSCPVDigit*>(cpvDigits->UncheckedAt(jdigit)); |
9688c1dd | 286 | Float_t x2 = cpvDigit2->GetXpad() ; |
287 | Float_t z2 = cpvDigit2->GetYpad() ; | |
288 | if (x1==x2 && z1==z2) { | |
289 | Float_t qsum = cpvDigit1->GetQpad() + cpvDigit2->GetQpad() ; | |
290 | cpvDigit2->SetQpad(qsum) ; | |
291 | cpvDigits->RemoveAt(idigit) ; | |
fa412d9b | 292 | } |
293 | } | |
9688c1dd | 294 | } |
295 | cpvDigits->Compress() ; | |
296 | ||
297 | // 3. add digits to temporary hit list fTmpHits | |
298 | ||
299 | ndigits = cpvDigits->GetEntriesFast(); | |
300 | for (idigit=0; idigit<ndigits; idigit++) { | |
29b077b5 | 301 | AliPHOSCPVDigit *cpvDigit = dynamic_cast<AliPHOSCPVDigit*>(cpvDigits->UncheckedAt(idigit)); |
9688c1dd | 302 | relid[0] = moduleNumber + 1 ; // CPV (or PHOS) module number |
303 | relid[1] =-1 ; // means CPV | |
304 | relid[2] = cpvDigit->GetXpad() ; // column number of a pad | |
305 | relid[3] = cpvDigit->GetYpad() ; // row number of a pad | |
306 | ||
307 | // get the absolute Id number | |
308 | GetGeometry()->RelToAbsNumbering(relid, absid) ; | |
309 | ||
310 | // add current digit to the temporary hit list | |
311 | ||
471193a8 | 312 | xyzte[3] = gMC->TrackTime() ; |
313 | xyzte[4] = cpvDigit->GetQpad() ; // amplitude in a pad | |
2af5445a | 314 | |
315 | Int_t primary = gAlice->GetMCApp()->GetPrimary( gAlice->GetMCApp()->GetCurrentTrackNumber() ); | |
316 | AddHit(fIshunt, primary, absid, xyzte); | |
9688c1dd | 317 | |
318 | if (cpvDigit->GetQpad() > 0.02) { | |
319 | xmean += cpvDigit->GetQpad() * (cpvDigit->GetXpad() + 0.5); | |
320 | zmean += cpvDigit->GetQpad() * (cpvDigit->GetYpad() + 0.5); | |
321 | qsum += cpvDigit->GetQpad(); | |
fa412d9b | 322 | } |
fa412d9b | 323 | } |
e534a69d | 324 | if (cpvDigits) { |
325 | cpvDigits->Delete(); | |
326 | delete cpvDigits; | |
327 | cpvDigits=0; | |
328 | } | |
9688c1dd | 329 | } |
037cc66d | 330 | |
9688c1dd | 331 | |
d6fb41ac | 332 | static Int_t idPXTL = gMC->VolId("PXTL"); |
333 | if(gMC->CurrentVolID(copy) == idPXTL ) { // We are inside a PBWO crystal | |
9688c1dd | 334 | |
fa412d9b | 335 | gMC->TrackPosition(pos) ; |
471193a8 | 336 | xyzte[0] = pos[0] ; |
337 | xyzte[1] = pos[1] ; | |
338 | xyzte[2] = pos[2] ; | |
597e6309 | 339 | |
9688c1dd | 340 | Float_t global[3], local[3] ; |
341 | global[0] = pos[0] ; | |
342 | global[1] = pos[1] ; | |
343 | global[2] = pos[2] ; | |
344 | Float_t lostenergy = gMC->Edep(); | |
f6d1e5e1 | 345 | |
346 | //Put in the TreeK particle entering PHOS and all its parents | |
347 | if ( gMC->IsTrackEntering() ){ | |
348 | Float_t xyzd[3] ; | |
471193a8 | 349 | gMC -> Gmtod (xyzte, xyzd, 1); // transform coordinate from master to daughter system |
97c3e101 | 350 | if (xyzd[1] < -GetGeometry()->GetCrystalSize(1)/2.+0.1){ //Entered close to forward surface |
5d12ce38 | 351 | Int_t parent = gAlice->GetMCApp()->GetCurrentTrackNumber() ; |
81d4c3d5 | 352 | TParticle * part = gAlice->GetMCApp()->Particle(parent) ; |
353 | Float_t vert[3],vertd[3] ; | |
354 | vert[0]=part->Vx() ; | |
355 | vert[1]=part->Vy() ; | |
356 | vert[2]=part->Vz() ; | |
357 | gMC -> Gmtod (vert, vertd, 1); // transform coordinate from master to daughter system | |
2af5445a | 358 | if(vertd[1]<-GetGeometry()->GetCrystalSize(1)/2.-0.1){ //Particle is created in foront of PHOS |
359 | //0.1 to get rid of numerical errors | |
360 | part->SetBit(kKeepBit); | |
81d4c3d5 | 361 | while ( parent != -1 ) { |
362 | part = gAlice->GetMCApp()->Particle(parent) ; | |
81d4c3d5 | 363 | part->SetBit(kKeepBit); |
364 | parent = part->GetFirstMother() ; | |
365 | } | |
f6d1e5e1 | 366 | } |
367 | } | |
368 | } | |
9688c1dd | 369 | if ( lostenergy != 0 ) { // Track is inside the crystal and deposits some energy |
471193a8 | 370 | xyzte[3] = gMC->TrackTime() ; |
f6d1e5e1 | 371 | |
9688c1dd | 372 | gMC->CurrentVolOffID(10, moduleNumber) ; // get the PHOS module number ; |
7b326aac | 373 | |
9688c1dd | 374 | Int_t strip ; |
375 | gMC->CurrentVolOffID(3, strip); | |
376 | Int_t cell ; | |
377 | gMC->CurrentVolOffID(2, cell); | |
f6d1e5e1 | 378 | |
9688c1dd | 379 | Int_t row = 1 + GetGeometry()->GetNZ() - strip % GetGeometry()->GetNZ() ; |
380 | Int_t col = (Int_t) TMath::Ceil((Double_t) strip/GetGeometry()->GetNZ()) -1 ; | |
f6d1e5e1 | 381 | |
9688c1dd | 382 | absid = (moduleNumber-1)*GetGeometry()->GetNCristalsInModule() + |
383 | row + (col*GetGeometry()->GetEMCAGeometry()->GetNCellsInStrip() + cell-1)*GetGeometry()->GetNZ() ; | |
f6d1e5e1 | 384 | |
9688c1dd | 385 | gMC->Gmtod(global, local, 1) ; |
386 | ||
471193a8 | 387 | //Calculates the light yield, the number of photons produced in the |
9688c1dd | 388 | //crystal |
27f33ee5 | 389 | Float_t lightYield = gRandom->Poisson(fLightFactor * lostenergy * |
9688c1dd | 390 | exp(-fLightYieldAttenuation * |
391 | (local[1]+GetGeometry()->GetCrystalSize(1)/2.0 )) | |
392 | ) ; | |
471193a8 | 393 | |
9688c1dd | 394 | //Calculates de energy deposited in the crystal |
471193a8 | 395 | xyzte[4] = fAPDFactor * lightYield ; |
9688c1dd | 396 | |
2af5445a | 397 | Int_t primary ; |
398 | if(fIshunt == 2){ | |
399 | primary = gAlice->GetMCApp()->GetCurrentTrackNumber() ; | |
400 | TParticle * part = gAlice->GetMCApp()->Particle(primary) ; | |
401 | while ( !part->TestBit(kKeepBit) ) { | |
402 | primary = part->GetFirstMother() ; | |
403 | if(primary == -1){ | |
404 | primary = gAlice->GetMCApp()->GetPrimary( gAlice->GetMCApp()->GetCurrentTrackNumber() ); | |
405 | break ; //there is a possibility that particle passed e.g. thermal isulator and hits a side | |
406 | //surface of the crystal. In this case it may have no primary at all. | |
407 | //We can not easily separate this case from the case when this is part of the shower, | |
408 | //developed in the neighboring crystal. | |
409 | } | |
410 | part = gAlice->GetMCApp()->Particle(primary) ; | |
411 | } | |
5a49626b | 412 | } |
2af5445a | 413 | else |
414 | primary = gAlice->GetMCApp()->GetPrimary( gAlice->GetMCApp()->GetCurrentTrackNumber() ); | |
5a49626b | 415 | |
2af5445a | 416 | |
417 | ||
9688c1dd | 418 | // add current hit to the hit list |
21cd0c07 | 419 | // Info("StepManager","%d %d", primary, tracknumber) ; |
2af5445a | 420 | AddHit(fIshunt, primary, absid, xyzte); |
184569b0 | 421 | |
fa412d9b | 422 | } // there is deposited energy |
423 | } // we are inside a PHOS Xtal | |
f6d1e5e1 | 424 | |
fa412d9b | 425 | } |
426 | ||
427 | //____________________________________________________________________________ | |
90cceaf6 | 428 | void AliPHOSv1::CPVDigitize (TLorentzVector p, Float_t *zxhit, TClonesArray *cpvDigits) |
fa412d9b | 429 | { |
430 | // ------------------------------------------------------------------------ | |
431 | // Digitize one CPV hit: | |
432 | // On input take exact 4-momentum p and position zxhit of the hit, | |
433 | // find the pad response around this hit and | |
434 | // put the amplitudes in the pads into array digits | |
435 | // | |
436 | // Author: Yuri Kharlov (after Serguei Sadovsky) | |
437 | // 2 October 2000 | |
438 | // ------------------------------------------------------------------------ | |
439 | ||
fa7cce36 | 440 | const Float_t kCelWr = GetGeometry()->GetPadSizePhi()/2; // Distance between wires (2 wires above 1 pad) |
a3dfe79c | 441 | const Float_t kDetR = 0.1; // Relative energy fluctuation in track for 100 e- |
442 | const Float_t kdEdx = 4.0; // Average energy loss in CPV; | |
443 | const Int_t kNgamz = 5; // Ionization size in Z | |
444 | const Int_t kNgamx = 9; // Ionization size in Phi | |
445 | const Float_t kNoise = 0.03; // charge noise in one pad | |
fa412d9b | 446 | |
447 | Float_t rnor1,rnor2; | |
448 | ||
449 | // Just a reminder on axes notation in the CPV module: | |
450 | // axis Z goes along the beam | |
451 | // axis X goes across the beam in the module plane | |
452 | // axis Y is a normal to the module plane showing from the IP | |
453 | ||
454 | Float_t hitX = zxhit[0]; | |
455 | Float_t hitZ =-zxhit[1]; | |
456 | Float_t pX = p.Px(); | |
457 | Float_t pZ =-p.Pz(); | |
458 | Float_t pNorm = p.Py(); | |
a3dfe79c | 459 | Float_t eloss = kdEdx; |
3d402178 | 460 | |
21cd0c07 | 461 | //Info("CPVDigitize", "YVK : %f %f | %f %f %d", hitX, hitZ, pX, pZ, pNorm) ; |
7b326aac | 462 | |
fa7cce36 | 463 | Float_t dZY = pZ/pNorm * GetGeometry()->GetCPVGasThickness(); |
464 | Float_t dXY = pX/pNorm * GetGeometry()->GetCPVGasThickness(); | |
fa412d9b | 465 | gRandom->Rannor(rnor1,rnor2); |
a3dfe79c | 466 | eloss *= (1 + kDetR*rnor1) * |
fa7cce36 | 467 | TMath::Sqrt((1 + ( pow(dZY,2) + pow(dXY,2) ) / pow(GetGeometry()->GetCPVGasThickness(),2))); |
468 | Float_t zhit1 = hitZ + GetGeometry()->GetCPVActiveSize(1)/2 - dZY/2; | |
469 | Float_t xhit1 = hitX + GetGeometry()->GetCPVActiveSize(0)/2 - dXY/2; | |
fa412d9b | 470 | Float_t zhit2 = zhit1 + dZY; |
471 | Float_t xhit2 = xhit1 + dXY; | |
472 | ||
a3dfe79c | 473 | Int_t iwht1 = (Int_t) (xhit1 / kCelWr); // wire (x) coordinate "in" |
474 | Int_t iwht2 = (Int_t) (xhit2 / kCelWr); // wire (x) coordinate "out" | |
fa412d9b | 475 | |
476 | Int_t nIter; | |
477 | Float_t zxe[3][5]; | |
478 | if (iwht1==iwht2) { // incline 1-wire hit | |
479 | nIter = 2; | |
480 | zxe[0][0] = (zhit1 + zhit2 - dZY*0.57735) / 2; | |
a3dfe79c | 481 | zxe[1][0] = (iwht1 + 0.5) * kCelWr; |
482 | zxe[2][0] = eloss/2; | |
fa412d9b | 483 | zxe[0][1] = (zhit1 + zhit2 + dZY*0.57735) / 2; |
a3dfe79c | 484 | zxe[1][1] = (iwht1 + 0.5) * kCelWr; |
485 | zxe[2][1] = eloss/2; | |
fa412d9b | 486 | } |
487 | else if (TMath::Abs(iwht1-iwht2) != 1) { // incline 3-wire hit | |
488 | nIter = 3; | |
489 | Int_t iwht3 = (iwht1 + iwht2) / 2; | |
a3dfe79c | 490 | Float_t xwht1 = (iwht1 + 0.5) * kCelWr; // wire 1 |
491 | Float_t xwht2 = (iwht2 + 0.5) * kCelWr; // wire 2 | |
492 | Float_t xwht3 = (iwht3 + 0.5) * kCelWr; // wire 3 | |
fa412d9b | 493 | Float_t xwr13 = (xwht1 + xwht3) / 2; // center 13 |
494 | Float_t xwr23 = (xwht2 + xwht3) / 2; // center 23 | |
495 | Float_t dxw1 = xhit1 - xwr13; | |
496 | Float_t dxw2 = xhit2 - xwr23; | |
a3dfe79c | 497 | Float_t egm1 = TMath::Abs(dxw1) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) + kCelWr ); |
498 | Float_t egm2 = TMath::Abs(dxw2) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) + kCelWr ); | |
499 | Float_t egm3 = kCelWr / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) + kCelWr ); | |
fa412d9b | 500 | zxe[0][0] = (dXY*(xwr13-xwht1)/dXY + zhit1 + zhit1) / 2; |
501 | zxe[1][0] = xwht1; | |
a3dfe79c | 502 | zxe[2][0] = eloss * egm1; |
fa412d9b | 503 | zxe[0][1] = (dXY*(xwr23-xwht1)/dXY + zhit1 + zhit2) / 2; |
504 | zxe[1][1] = xwht2; | |
a3dfe79c | 505 | zxe[2][1] = eloss * egm2; |
fa412d9b | 506 | zxe[0][2] = dXY*(xwht3-xwht1)/dXY + zhit1; |
507 | zxe[1][2] = xwht3; | |
a3dfe79c | 508 | zxe[2][2] = eloss * egm3; |
fa412d9b | 509 | } |
510 | else { // incline 2-wire hit | |
511 | nIter = 2; | |
a3dfe79c | 512 | Float_t xwht1 = (iwht1 + 0.5) * kCelWr; |
513 | Float_t xwht2 = (iwht2 + 0.5) * kCelWr; | |
fa412d9b | 514 | Float_t xwr12 = (xwht1 + xwht2) / 2; |
515 | Float_t dxw1 = xhit1 - xwr12; | |
516 | Float_t dxw2 = xhit2 - xwr12; | |
517 | Float_t egm1 = TMath::Abs(dxw1) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) ); | |
518 | Float_t egm2 = TMath::Abs(dxw2) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) ); | |
519 | zxe[0][0] = (zhit1 + zhit2 - dZY*egm1) / 2; | |
520 | zxe[1][0] = xwht1; | |
a3dfe79c | 521 | zxe[2][0] = eloss * egm1; |
fa412d9b | 522 | zxe[0][1] = (zhit1 + zhit2 + dZY*egm2) / 2; |
523 | zxe[1][1] = xwht2; | |
a3dfe79c | 524 | zxe[2][1] = eloss * egm2; |
fa412d9b | 525 | } |
bea63bea | 526 | |
fa412d9b | 527 | // Finite size of ionization region |
528 | ||
fa7cce36 | 529 | Int_t nCellZ = GetGeometry()->GetNumberOfCPVPadsZ(); |
530 | Int_t nCellX = GetGeometry()->GetNumberOfCPVPadsPhi(); | |
a3dfe79c | 531 | Int_t nz3 = (kNgamz+1)/2; |
532 | Int_t nx3 = (kNgamx+1)/2; | |
533 | cpvDigits->Expand(nIter*kNgamx*kNgamz); | |
29b077b5 | 534 | TClonesArray &ldigits = *(static_cast<TClonesArray *>(cpvDigits)); |
fa412d9b | 535 | |
536 | for (Int_t iter=0; iter<nIter; iter++) { | |
537 | ||
538 | Float_t zhit = zxe[0][iter]; | |
539 | Float_t xhit = zxe[1][iter]; | |
540 | Float_t qhit = zxe[2][iter]; | |
fa7cce36 | 541 | Float_t zcell = zhit / GetGeometry()->GetPadSizeZ(); |
542 | Float_t xcell = xhit / GetGeometry()->GetPadSizePhi(); | |
fa412d9b | 543 | if ( zcell<=0 || xcell<=0 || |
544 | zcell>=nCellZ || xcell>=nCellX) return; | |
545 | Int_t izcell = (Int_t) zcell; | |
546 | Int_t ixcell = (Int_t) xcell; | |
547 | Float_t zc = zcell - izcell - 0.5; | |
548 | Float_t xc = xcell - ixcell - 0.5; | |
a3dfe79c | 549 | for (Int_t iz=1; iz<=kNgamz; iz++) { |
fa412d9b | 550 | Int_t kzg = izcell + iz - nz3; |
551 | if (kzg<=0 || kzg>nCellZ) continue; | |
552 | Float_t zg = (Float_t)(iz-nz3) - zc; | |
a3dfe79c | 553 | for (Int_t ix=1; ix<=kNgamx; ix++) { |
fa412d9b | 554 | Int_t kxg = ixcell + ix - nx3; |
555 | if (kxg<=0 || kxg>nCellX) continue; | |
556 | Float_t xg = (Float_t)(ix-nx3) - xc; | |
557 | ||
558 | // Now calculate pad response | |
559 | Float_t qpad = CPVPadResponseFunction(qhit,zg,xg); | |
a3dfe79c | 560 | qpad += kNoise*rnor2; |
fa412d9b | 561 | if (qpad<0) continue; |
562 | ||
563 | // Fill the array with pad response ID and amplitude | |
3d402178 | 564 | new(ldigits[cpvDigits->GetEntriesFast()]) AliPHOSCPVDigit(kxg,kzg,qpad); |
fa412d9b | 565 | } |
fa412d9b | 566 | } |
fa412d9b | 567 | } |
568 | } | |
569 | ||
570 | //____________________________________________________________________________ | |
571 | Float_t AliPHOSv1::CPVPadResponseFunction(Float_t qhit, Float_t zhit, Float_t xhit) { | |
572 | // ------------------------------------------------------------------------ | |
573 | // Calculate the amplitude in one CPV pad using the | |
574 | // cumulative pad response function | |
575 | // Author: Yuri Kharlov (after Serguei Sadovski) | |
576 | // 3 October 2000 | |
577 | // ------------------------------------------------------------------------ | |
578 | ||
fa7cce36 | 579 | Double_t dz = GetGeometry()->GetPadSizeZ() / 2; |
580 | Double_t dx = GetGeometry()->GetPadSizePhi() / 2; | |
581 | Double_t z = zhit * GetGeometry()->GetPadSizeZ(); | |
582 | Double_t x = xhit * GetGeometry()->GetPadSizePhi(); | |
fa412d9b | 583 | Double_t amplitude = qhit * |
584 | (CPVCumulPadResponse(z+dz,x+dx) - CPVCumulPadResponse(z+dz,x-dx) - | |
585 | CPVCumulPadResponse(z-dz,x+dx) + CPVCumulPadResponse(z-dz,x-dx)); | |
586 | return (Float_t)amplitude; | |
7587f5a5 | 587 | } |
588 | ||
fa412d9b | 589 | //____________________________________________________________________________ |
590 | Double_t AliPHOSv1::CPVCumulPadResponse(Double_t x, Double_t y) { | |
591 | // ------------------------------------------------------------------------ | |
592 | // Cumulative pad response function | |
593 | // It includes several terms from the CF decomposition in electrostatics | |
594 | // Note: this cumulative function is wrong since omits some terms | |
595 | // but the cell amplitude obtained with it is correct because | |
596 | // these omitting terms cancel | |
597 | // Author: Yuri Kharlov (after Serguei Sadovski) | |
598 | // 3 October 2000 | |
599 | // ------------------------------------------------------------------------ | |
600 | ||
a3dfe79c | 601 | const Double_t kA=1.0; |
602 | const Double_t kB=0.7; | |
fa412d9b | 603 | |
604 | Double_t r2 = x*x + y*y; | |
605 | Double_t xy = x*y; | |
606 | Double_t cumulPRF = 0; | |
607 | for (Int_t i=0; i<=4; i++) { | |
a3dfe79c | 608 | Double_t b1 = (2*i + 1) * kB; |
fa412d9b | 609 | cumulPRF += TMath::Power(-1,i) * TMath::ATan( xy / (b1*TMath::Sqrt(b1*b1 + r2)) ); |
610 | } | |
a3dfe79c | 611 | cumulPRF *= kA/(2*TMath::Pi()); |
fa412d9b | 612 | return cumulPRF; |
613 | } | |
7eb9d12d | 614 |