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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 | |
7587f5a5 | 18 | //_________________________________________________________________________ |
5f20d3fb | 19 | // Implementation version v1 of PHOS Manager class |
a3dfe79c | 20 | //--- |
21 | // Layout EMC + PPSD has name GPS2: | |
ed4205d8 | 22 | // Produces cumulated hits |
a3dfe79c | 23 | //--- |
24 | // Layout EMC + CPV has name IHEP: | |
ed4205d8 | 25 | // Produces hits for CPV, cumulated hits |
26 | //--- | |
27 | // Layout EMC + CPV + PPSD has name GPS: | |
28 | // Produces hits for CPV, cumulated hits | |
29 | //--- | |
5f20d3fb | 30 | //*-- Author: Yves Schutz (SUBATECH) |
b2a60966 | 31 | |
7587f5a5 | 32 | |
33 | // --- ROOT system --- | |
bea63bea | 34 | |
35 | #include "TBRIK.h" | |
36 | #include "TNode.h" | |
7587f5a5 | 37 | #include "TRandom.h" |
94de3818 | 38 | #include "TTree.h" |
7587f5a5 | 39 | |
5f20d3fb | 40 | |
7587f5a5 | 41 | // --- Standard library --- |
42 | ||
de9ec31b | 43 | #include <stdio.h> |
44 | #include <string.h> | |
45 | #include <stdlib.h> | |
46 | #include <strstream.h> | |
7587f5a5 | 47 | |
48 | // --- AliRoot header files --- | |
49 | ||
50 | #include "AliPHOSv1.h" | |
51 | #include "AliPHOSHit.h" | |
97cee223 | 52 | #include "AliPHOSCPVDigit.h" |
7587f5a5 | 53 | #include "AliRun.h" |
54 | #include "AliConst.h" | |
94de3818 | 55 | #include "AliMC.h" |
97cee223 | 56 | #include "AliPHOSGeometry.h" |
7b326aac | 57 | #include "AliPHOSQAIntCheckable.h" |
58 | #include "AliPHOSQAFloatCheckable.h" | |
59 | #include "AliPHOSQAMeanChecker.h" | |
7587f5a5 | 60 | |
61 | ClassImp(AliPHOSv1) | |
62 | ||
bea63bea | 63 | //____________________________________________________________________________ |
02ab1add | 64 | AliPHOSv1::AliPHOSv1(): |
65 | AliPHOSv0() | |
bea63bea | 66 | { |
735e58f1 | 67 | // default ctor: initialze data memebers |
68 | fQAHitsMul = 0 ; | |
69 | fQAHitsMulB = 0 ; | |
70 | fQATotEner = 0 ; | |
71 | fQATotEnerB = 0 ; | |
9688c1dd | 72 | |
73 | fLightYieldMean = 0. ; | |
74 | fIntrinsicPINEfficiency = 0. ; | |
75 | fLightYieldAttenuation = 0. ; | |
76 | fRecalibrationFactor = 0. ; | |
77 | fElectronsPerGeV = 0. ; | |
78 | fAPDGain = 0. ; | |
79 | ||
bea63bea | 80 | } |
81 | ||
7587f5a5 | 82 | //____________________________________________________________________________ |
83 | AliPHOSv1::AliPHOSv1(const char *name, const char *title): | |
7b326aac | 84 | AliPHOSv0(name,title) |
7587f5a5 | 85 | { |
5f20d3fb | 86 | // |
ed4205d8 | 87 | // We store hits : |
5f20d3fb | 88 | // - fHits (the "normal" one), which retains the hits associated with |
89 | // the current primary particle being tracked | |
90 | // (this array is reset after each primary has been tracked). | |
91 | // | |
fa412d9b | 92 | |
037cc66d | 93 | |
5f20d3fb | 94 | |
95 | // We do not want to save in TreeH the raw hits | |
96 | // But save the cumulated hits instead (need to create the branch myself) | |
97 | // It is put in the Digit Tree because the TreeH is filled after each primary | |
7b326aac | 98 | // and the TreeD at the end of the event (branch is set in FinishEvent() ). |
5f20d3fb | 99 | |
ed4205d8 | 100 | fHits= new TClonesArray("AliPHOSHit",1000) ; |
5f20d3fb | 101 | |
ed4205d8 | 102 | fNhits = 0 ; |
5f20d3fb | 103 | |
5f20d3fb | 104 | fIshunt = 1 ; // All hits are associated with primary particles |
7b326aac | 105 | |
9688c1dd | 106 | //Photoelectron statistics: |
107 | // The light yield is a poissonian distribution of the number of | |
108 | // photons created in the PbWo4 crystal, calculated using following formula | |
109 | // NumberOfPhotons = EnergyLost * LightYieldMean* APDEfficiency * | |
110 | // exp (-LightYieldAttenuation * DistanceToPINdiodeFromTheHit); | |
111 | // LightYieldMean is parameter calculated to be over 47000 photons per GeV | |
112 | // APDEfficiency is 0.02655 | |
113 | // k_0 is 0.0045 from Valery Antonenko | |
114 | // The number of electrons created in the APD is | |
115 | // NumberOfElectrons = APDGain * LightYield | |
116 | // The APD Gain is 300 | |
117 | fLightYieldMean = 47000; | |
118 | fIntrinsicPINEfficiency = 0.02655 ; //APD= 0.1875/0.1271 * 0.018 (PIN) | |
119 | fLightYieldAttenuation = 0.0045 ; | |
120 | fRecalibrationFactor = 13.418/ fLightYieldMean ; | |
121 | fElectronsPerGeV = 2.77e+8 ; | |
122 | fAPDGain= 300. ; | |
123 | ||
fa7cce36 | 124 | Int_t nb = GetGeometry()->GetNModules() ; |
fa412d9b | 125 | |
7b326aac | 126 | // create checkables |
127 | fQAHitsMul = new AliPHOSQAIntCheckable("HitsM") ; | |
128 | fQATotEner = new AliPHOSQAFloatCheckable("TotEn") ; | |
129 | fQAHitsMulB = new TClonesArray("AliPHOSQAIntCheckable",nb) ; | |
130 | fQATotEnerB = new TClonesArray("AliPHOSQAFloatCheckable", nb); | |
131 | char tempo[20] ; | |
132 | Int_t i ; | |
133 | for ( i = 0 ; i < nb ; i++ ) { | |
134 | sprintf(tempo, "HitsMB%d", i+1) ; | |
135 | new( (*fQAHitsMulB)[i]) AliPHOSQAIntCheckable(tempo) ; | |
136 | sprintf(tempo, "TotEnB%d", i+1) ; | |
137 | new( (*fQATotEnerB)[i] ) AliPHOSQAFloatCheckable(tempo) ; | |
138 | } | |
139 | ||
7b326aac | 140 | AliPHOSQAMeanChecker * hmc = new AliPHOSQAMeanChecker("HitsMul", 100. ,25.) ; |
141 | AliPHOSQAMeanChecker * emc = new AliPHOSQAMeanChecker("TotEner", 10. ,5.) ; | |
142 | AliPHOSQAMeanChecker * bhmc = new AliPHOSQAMeanChecker("HitsMulB", 100. ,5.) ; | |
143 | AliPHOSQAMeanChecker * bemc = new AliPHOSQAMeanChecker("TotEnerB", 2. ,.5) ; | |
144 | ||
145 | // associate checkables and checkers | |
146 | fQAHitsMul->AddChecker(hmc) ; | |
147 | fQATotEner->AddChecker(emc) ; | |
148 | for ( i = 0 ; i < nb ; i++ ) { | |
29b077b5 | 149 | (static_cast<AliPHOSQAIntCheckable*>((*fQAHitsMulB)[i]))->AddChecker(bhmc) ; |
150 | (static_cast<AliPHOSQAFloatCheckable*>((*fQATotEnerB)[i]))->AddChecker(bemc) ; | |
7b326aac | 151 | } |
7b7c1533 | 152 | |
5f20d3fb | 153 | } |
154 | ||
7587f5a5 | 155 | //____________________________________________________________________________ |
bea63bea | 156 | AliPHOSv1::~AliPHOSv1() |
b2a60966 | 157 | { |
bea63bea | 158 | // dtor |
5f20d3fb | 159 | |
ed4205d8 | 160 | if ( fHits) { |
161 | fHits->Delete() ; | |
162 | delete fHits ; | |
163 | fHits = 0 ; | |
8dfa469d | 164 | } |
7b7c1533 | 165 | if (fTreeQA) |
166 | delete fTreeQA ; | |
7587f5a5 | 167 | } |
168 | ||
7587f5a5 | 169 | //____________________________________________________________________________ |
b37750a6 | 170 | void AliPHOSv1::AddHit(Int_t shunt, Int_t primary, Int_t tracknumber, Int_t Id, Float_t * hits) |
bea63bea | 171 | { |
172 | // Add a hit to the hit list. | |
9688c1dd | 173 | // A PHOS hit is the sum of all hits in a single crystal from one primary and within soem taime gate |
bea63bea | 174 | |
5f20d3fb | 175 | Int_t hitCounter ; |
bea63bea | 176 | AliPHOSHit *newHit ; |
5f20d3fb | 177 | AliPHOSHit *curHit ; |
178 | Bool_t deja = kFALSE ; | |
fa7cce36 | 179 | AliPHOSGeometry * geom = GetGeometry() ; |
bea63bea | 180 | |
b37750a6 | 181 | newHit = new AliPHOSHit(shunt, primary, tracknumber, Id, hits) ; |
bea63bea | 182 | |
7854a24a | 183 | for ( hitCounter = fNhits-1 ; hitCounter >= 0 && !deja ; hitCounter-- ) { |
29b077b5 | 184 | curHit = dynamic_cast<AliPHOSHit*>((*fHits)[hitCounter]) ; |
9688c1dd | 185 | if(curHit->GetPrimary() != primary) break ; |
186 | // We add hits with the same primary, while GEANT treats primaries succesively | |
ed4205d8 | 187 | if( *curHit == *newHit ) { |
f15a01eb | 188 | *curHit + *newHit ; |
ed4205d8 | 189 | deja = kTRUE ; |
5f20d3fb | 190 | } |
191 | } | |
192 | ||
193 | if ( !deja ) { | |
ed4205d8 | 194 | new((*fHits)[fNhits]) AliPHOSHit(*newHit) ; |
7b326aac | 195 | // get the block Id number |
9688c1dd | 196 | Int_t relid[4] ; |
fa7cce36 | 197 | geom->AbsToRelNumbering(Id, relid) ; |
7b326aac | 198 | // and fill the relevant QA checkable (only if in PbW04) |
199 | if ( relid[1] == 0 ) { | |
200 | fQAHitsMul->Update(1) ; | |
29b077b5 | 201 | (static_cast<AliPHOSQAIntCheckable*>((*fQAHitsMulB)[relid[0]-1]))->Update(1) ; |
7b326aac | 202 | } |
ed4205d8 | 203 | fNhits++ ; |
5f20d3fb | 204 | } |
205 | ||
bea63bea | 206 | delete newHit; |
bea63bea | 207 | } |
208 | ||
7b326aac | 209 | //____________________________________________________________________________ |
210 | void AliPHOSv1::FinishPrimary() | |
211 | { | |
212 | // called at the end of each track (primary) by AliRun | |
213 | // hits are reset for each new track | |
214 | // accumulate the total hit-multiplicity | |
215 | // if ( fQAHitsMul ) | |
216 | // fQAHitsMul->Update( fHits->GetEntriesFast() ) ; | |
217 | ||
218 | } | |
219 | ||
220 | //____________________________________________________________________________ | |
221 | void AliPHOSv1::FinishEvent() | |
222 | { | |
223 | // called at the end of each event by AliRun | |
224 | // accumulate the hit-multiplicity and total energy per block | |
225 | // if the values have been updated check it | |
226 | ||
227 | if ( fQATotEner ) { | |
228 | if ( fQATotEner->HasChanged() ) { | |
229 | fQATotEner->CheckMe() ; | |
230 | fQATotEner->Reset() ; | |
231 | } | |
232 | } | |
233 | ||
234 | Int_t i ; | |
235 | if ( fQAHitsMulB && fQATotEnerB ) { | |
fa7cce36 | 236 | for (i = 0 ; i < GetGeometry()->GetNModules() ; i++) { |
29b077b5 | 237 | AliPHOSQAIntCheckable * ci = static_cast<AliPHOSQAIntCheckable*>((*fQAHitsMulB)[i]) ; |
238 | AliPHOSQAFloatCheckable* cf = static_cast<AliPHOSQAFloatCheckable*>((*fQATotEnerB)[i]) ; | |
7b326aac | 239 | if ( ci->HasChanged() ) { |
240 | ci->CheckMe() ; | |
241 | ci->Reset() ; | |
242 | } | |
243 | if ( cf->HasChanged() ) { | |
244 | cf->CheckMe() ; | |
245 | cf->Reset() ; | |
246 | } | |
247 | } | |
248 | } | |
249 | ||
250 | // check the total multiplicity | |
251 | ||
252 | if ( fQAHitsMul ) { | |
253 | if ( fQAHitsMul->HasChanged() ) { | |
254 | fQAHitsMul->CheckMe() ; | |
255 | fQAHitsMul->Reset() ; | |
256 | } | |
257 | } | |
258 | } | |
5f20d3fb | 259 | //____________________________________________________________________________ |
7587f5a5 | 260 | void AliPHOSv1::StepManager(void) |
261 | { | |
9688c1dd | 262 | // Accumulates hits as long as the track stays in a single crystal or CPV gas Cell |
b2a60966 | 263 | |
4f5bbbd4 | 264 | Int_t relid[4] ; // (box, layer, row, column) indices |
265 | Int_t absid ; // absolute cell ID number | |
9688c1dd | 266 | Float_t xyze[5]={-1000,-1000,-1000,0,0} ; // position wrt MRS, time and energy deposited |
4f5bbbd4 | 267 | TLorentzVector pos ; // Lorentz vector of the track current position |
fa412d9b | 268 | Int_t copy ; |
7587f5a5 | 269 | |
bea63bea | 270 | Int_t tracknumber = gAlice->CurrentTrack() ; |
fa412d9b | 271 | Int_t primary = gAlice->GetPrimary( gAlice->CurrentTrack() ); |
fa7cce36 | 272 | TString name = GetGeometry()->GetName() ; |
037cc66d | 273 | |
9688c1dd | 274 | Int_t moduleNumber ; |
275 | ||
276 | if( gMC->CurrentVolID(copy) == gMC->VolId("PCPQ") && | |
277 | (gMC->IsTrackEntering() ) && | |
278 | gMC->TrackCharge() != 0) { | |
b37750a6 | 279 | |
9688c1dd | 280 | gMC -> TrackPosition(pos); |
281 | ||
282 | Float_t xyzm[3], xyzd[3] ; | |
283 | Int_t i; | |
284 | for (i=0; i<3; i++) xyzm[i] = pos[i]; | |
285 | gMC -> Gmtod (xyzm, xyzd, 1); // transform coordinate from master to daughter system | |
286 | ||
287 | Float_t xyd[3]={0,0,0} ; //local posiiton of the entering | |
288 | xyd[0] = xyzd[0]; | |
289 | xyd[1] =-xyzd[2]; | |
290 | xyd[2] =-xyzd[1]; | |
291 | ||
292 | // Current momentum of the hit's track in the local ref. system | |
293 | TLorentzVector pmom ; //momentum of the particle initiated hit | |
294 | gMC -> TrackMomentum(pmom); | |
295 | Float_t pm[3], pd[3]; | |
296 | for (i=0; i<3; i++) | |
297 | pm[i] = pmom[i]; | |
298 | ||
299 | gMC -> Gmtod (pm, pd, 2); // transform 3-momentum from master to daughter system | |
300 | pmom[0] = pd[0]; | |
301 | pmom[1] =-pd[2]; | |
302 | pmom[2] =-pd[1]; | |
fa412d9b | 303 | |
9688c1dd | 304 | // Digitize the current CPV hit: |
305 | ||
306 | // 1. find pad response and | |
307 | gMC->CurrentVolOffID(3,moduleNumber); | |
308 | moduleNumber--; | |
309 | ||
310 | TClonesArray *cpvDigits = new TClonesArray("AliPHOSCPVDigit",0); // array of digits for current hit | |
311 | CPVDigitize(pmom,xyd,moduleNumber,cpvDigits); | |
fa412d9b | 312 | |
9688c1dd | 313 | Float_t xmean = 0; |
314 | Float_t zmean = 0; | |
315 | Float_t qsum = 0; | |
316 | Int_t idigit,ndigits; | |
317 | ||
318 | // 2. go through the current digit list and sum digits in pads | |
319 | ||
320 | ndigits = cpvDigits->GetEntriesFast(); | |
321 | for (idigit=0; idigit<ndigits-1; idigit++) { | |
29b077b5 | 322 | AliPHOSCPVDigit *cpvDigit1 = dynamic_cast<AliPHOSCPVDigit*>(cpvDigits->UncheckedAt(idigit)); |
9688c1dd | 323 | Float_t x1 = cpvDigit1->GetXpad() ; |
324 | Float_t z1 = cpvDigit1->GetYpad() ; | |
325 | for (Int_t jdigit=idigit+1; jdigit<ndigits; jdigit++) { | |
29b077b5 | 326 | AliPHOSCPVDigit *cpvDigit2 = dynamic_cast<AliPHOSCPVDigit*>(cpvDigits->UncheckedAt(jdigit)); |
9688c1dd | 327 | Float_t x2 = cpvDigit2->GetXpad() ; |
328 | Float_t z2 = cpvDigit2->GetYpad() ; | |
329 | if (x1==x2 && z1==z2) { | |
330 | Float_t qsum = cpvDigit1->GetQpad() + cpvDigit2->GetQpad() ; | |
331 | cpvDigit2->SetQpad(qsum) ; | |
332 | cpvDigits->RemoveAt(idigit) ; | |
fa412d9b | 333 | } |
334 | } | |
9688c1dd | 335 | } |
336 | cpvDigits->Compress() ; | |
337 | ||
338 | // 3. add digits to temporary hit list fTmpHits | |
339 | ||
340 | ndigits = cpvDigits->GetEntriesFast(); | |
341 | for (idigit=0; idigit<ndigits; idigit++) { | |
29b077b5 | 342 | AliPHOSCPVDigit *cpvDigit = dynamic_cast<AliPHOSCPVDigit*>(cpvDigits->UncheckedAt(idigit)); |
9688c1dd | 343 | relid[0] = moduleNumber + 1 ; // CPV (or PHOS) module number |
344 | relid[1] =-1 ; // means CPV | |
345 | relid[2] = cpvDigit->GetXpad() ; // column number of a pad | |
346 | relid[3] = cpvDigit->GetYpad() ; // row number of a pad | |
347 | ||
348 | // get the absolute Id number | |
349 | GetGeometry()->RelToAbsNumbering(relid, absid) ; | |
350 | ||
351 | // add current digit to the temporary hit list | |
352 | ||
353 | xyze[3] = gMC->TrackTime() ; | |
354 | xyze[4] = cpvDigit->GetQpad() ; // amplitude in a pad | |
355 | primary = -1; // No need in primary for CPV | |
356 | AddHit(fIshunt, primary, tracknumber, absid, xyze); | |
357 | ||
358 | if (cpvDigit->GetQpad() > 0.02) { | |
359 | xmean += cpvDigit->GetQpad() * (cpvDigit->GetXpad() + 0.5); | |
360 | zmean += cpvDigit->GetQpad() * (cpvDigit->GetYpad() + 0.5); | |
361 | qsum += cpvDigit->GetQpad(); | |
fa412d9b | 362 | } |
fa412d9b | 363 | } |
9688c1dd | 364 | delete cpvDigits; |
365 | } | |
037cc66d | 366 | |
9688c1dd | 367 | |
368 | ||
fa412d9b | 369 | if(gMC->CurrentVolID(copy) == gMC->VolId("PXTL") ) { // We are inside a PBWO crystal |
9688c1dd | 370 | |
fa412d9b | 371 | gMC->TrackPosition(pos) ; |
372 | xyze[0] = pos[0] ; | |
373 | xyze[1] = pos[1] ; | |
374 | xyze[2] = pos[2] ; | |
9688c1dd | 375 | Float_t global[3], local[3] ; |
376 | global[0] = pos[0] ; | |
377 | global[1] = pos[1] ; | |
378 | global[2] = pos[2] ; | |
379 | Float_t lostenergy = gMC->Edep(); | |
037cc66d | 380 | |
9688c1dd | 381 | if ( lostenergy != 0 ) { // Track is inside the crystal and deposits some energy |
382 | ||
383 | xyze[3] = gMC->TrackTime() ; | |
ed4205d8 | 384 | |
9688c1dd | 385 | gMC->CurrentVolOffID(10, moduleNumber) ; // get the PHOS module number ; |
7b326aac | 386 | |
387 | // fill the relevant QA Checkables | |
9688c1dd | 388 | fQATotEner->Update( xyze[4] ) ; // total energy in PHOS |
29b077b5 | 389 | (static_cast<AliPHOSQAFloatCheckable*>((*fQATotEnerB)[moduleNumber-1]))->Update( xyze[4] ) ; // energy in this block |
fad3e5b9 | 390 | |
9688c1dd | 391 | Int_t strip ; |
392 | gMC->CurrentVolOffID(3, strip); | |
393 | Int_t cell ; | |
394 | gMC->CurrentVolOffID(2, cell); | |
ed4205d8 | 395 | |
9688c1dd | 396 | Int_t row = 1 + GetGeometry()->GetNZ() - strip % GetGeometry()->GetNZ() ; |
397 | Int_t col = (Int_t) TMath::Ceil((Double_t) strip/GetGeometry()->GetNZ()) -1 ; | |
037cc66d | 398 | |
9688c1dd | 399 | absid = (moduleNumber-1)*GetGeometry()->GetNCristalsInModule() + |
400 | row + (col*GetGeometry()->GetEMCAGeometry()->GetNCellsInStrip() + cell-1)*GetGeometry()->GetNZ() ; | |
ed4205d8 | 401 | |
9688c1dd | 402 | gMC->Gmtod(global, local, 1) ; |
403 | ||
404 | //Calculates the light yield, the number of photns produced in the | |
405 | //crystal | |
406 | Float_t lightYield = gRandom->Poisson(fLightYieldMean * lostenergy * | |
407 | fIntrinsicPINEfficiency * | |
408 | exp(-fLightYieldAttenuation * | |
409 | (local[1]+GetGeometry()->GetCrystalSize(1)/2.0 )) | |
410 | ) ; | |
411 | //Calculates de energy deposited in the crystal | |
412 | xyze[4] = (fRecalibrationFactor/100.) * fAPDGain * lightYield ; | |
413 | ||
414 | // add current hit to the hit list | |
415 | AddHit(fIshunt, primary,tracknumber, absid, xyze); | |
416 | ||
417 | ||
fa412d9b | 418 | } // there is deposited energy |
419 | } // we are inside a PHOS Xtal | |
9688c1dd | 420 | |
fa412d9b | 421 | } |
422 | ||
423 | //____________________________________________________________________________ | |
424 | void AliPHOSv1::CPVDigitize (TLorentzVector p, Float_t *zxhit, Int_t moduleNumber, TClonesArray *cpvDigits) | |
425 | { | |
426 | // ------------------------------------------------------------------------ | |
427 | // Digitize one CPV hit: | |
428 | // On input take exact 4-momentum p and position zxhit of the hit, | |
429 | // find the pad response around this hit and | |
430 | // put the amplitudes in the pads into array digits | |
431 | // | |
432 | // Author: Yuri Kharlov (after Serguei Sadovsky) | |
433 | // 2 October 2000 | |
434 | // ------------------------------------------------------------------------ | |
435 | ||
fa7cce36 | 436 | const Float_t kCelWr = GetGeometry()->GetPadSizePhi()/2; // Distance between wires (2 wires above 1 pad) |
a3dfe79c | 437 | const Float_t kDetR = 0.1; // Relative energy fluctuation in track for 100 e- |
438 | const Float_t kdEdx = 4.0; // Average energy loss in CPV; | |
439 | const Int_t kNgamz = 5; // Ionization size in Z | |
440 | const Int_t kNgamx = 9; // Ionization size in Phi | |
441 | const Float_t kNoise = 0.03; // charge noise in one pad | |
fa412d9b | 442 | |
443 | Float_t rnor1,rnor2; | |
444 | ||
445 | // Just a reminder on axes notation in the CPV module: | |
446 | // axis Z goes along the beam | |
447 | // axis X goes across the beam in the module plane | |
448 | // axis Y is a normal to the module plane showing from the IP | |
449 | ||
450 | Float_t hitX = zxhit[0]; | |
451 | Float_t hitZ =-zxhit[1]; | |
452 | Float_t pX = p.Px(); | |
453 | Float_t pZ =-p.Pz(); | |
454 | Float_t pNorm = p.Py(); | |
a3dfe79c | 455 | Float_t eloss = kdEdx; |
3d402178 | 456 | |
7b326aac | 457 | // cout << "CPVDigitize: YVK : "<<hitX<<" "<<hitZ<<" | "<<pX<<" "<<pZ<<" "<<pNorm<<endl; |
458 | ||
fa7cce36 | 459 | Float_t dZY = pZ/pNorm * GetGeometry()->GetCPVGasThickness(); |
460 | Float_t dXY = pX/pNorm * GetGeometry()->GetCPVGasThickness(); | |
fa412d9b | 461 | gRandom->Rannor(rnor1,rnor2); |
a3dfe79c | 462 | eloss *= (1 + kDetR*rnor1) * |
fa7cce36 | 463 | TMath::Sqrt((1 + ( pow(dZY,2) + pow(dXY,2) ) / pow(GetGeometry()->GetCPVGasThickness(),2))); |
464 | Float_t zhit1 = hitZ + GetGeometry()->GetCPVActiveSize(1)/2 - dZY/2; | |
465 | Float_t xhit1 = hitX + GetGeometry()->GetCPVActiveSize(0)/2 - dXY/2; | |
fa412d9b | 466 | Float_t zhit2 = zhit1 + dZY; |
467 | Float_t xhit2 = xhit1 + dXY; | |
468 | ||
a3dfe79c | 469 | Int_t iwht1 = (Int_t) (xhit1 / kCelWr); // wire (x) coordinate "in" |
470 | Int_t iwht2 = (Int_t) (xhit2 / kCelWr); // wire (x) coordinate "out" | |
fa412d9b | 471 | |
472 | Int_t nIter; | |
473 | Float_t zxe[3][5]; | |
474 | if (iwht1==iwht2) { // incline 1-wire hit | |
475 | nIter = 2; | |
476 | zxe[0][0] = (zhit1 + zhit2 - dZY*0.57735) / 2; | |
a3dfe79c | 477 | zxe[1][0] = (iwht1 + 0.5) * kCelWr; |
478 | zxe[2][0] = eloss/2; | |
fa412d9b | 479 | zxe[0][1] = (zhit1 + zhit2 + dZY*0.57735) / 2; |
a3dfe79c | 480 | zxe[1][1] = (iwht1 + 0.5) * kCelWr; |
481 | zxe[2][1] = eloss/2; | |
fa412d9b | 482 | } |
483 | else if (TMath::Abs(iwht1-iwht2) != 1) { // incline 3-wire hit | |
484 | nIter = 3; | |
485 | Int_t iwht3 = (iwht1 + iwht2) / 2; | |
a3dfe79c | 486 | Float_t xwht1 = (iwht1 + 0.5) * kCelWr; // wire 1 |
487 | Float_t xwht2 = (iwht2 + 0.5) * kCelWr; // wire 2 | |
488 | Float_t xwht3 = (iwht3 + 0.5) * kCelWr; // wire 3 | |
fa412d9b | 489 | Float_t xwr13 = (xwht1 + xwht3) / 2; // center 13 |
490 | Float_t xwr23 = (xwht2 + xwht3) / 2; // center 23 | |
491 | Float_t dxw1 = xhit1 - xwr13; | |
492 | Float_t dxw2 = xhit2 - xwr23; | |
a3dfe79c | 493 | Float_t egm1 = TMath::Abs(dxw1) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) + kCelWr ); |
494 | Float_t egm2 = TMath::Abs(dxw2) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) + kCelWr ); | |
495 | Float_t egm3 = kCelWr / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) + kCelWr ); | |
fa412d9b | 496 | zxe[0][0] = (dXY*(xwr13-xwht1)/dXY + zhit1 + zhit1) / 2; |
497 | zxe[1][0] = xwht1; | |
a3dfe79c | 498 | zxe[2][0] = eloss * egm1; |
fa412d9b | 499 | zxe[0][1] = (dXY*(xwr23-xwht1)/dXY + zhit1 + zhit2) / 2; |
500 | zxe[1][1] = xwht2; | |
a3dfe79c | 501 | zxe[2][1] = eloss * egm2; |
fa412d9b | 502 | zxe[0][2] = dXY*(xwht3-xwht1)/dXY + zhit1; |
503 | zxe[1][2] = xwht3; | |
a3dfe79c | 504 | zxe[2][2] = eloss * egm3; |
fa412d9b | 505 | } |
506 | else { // incline 2-wire hit | |
507 | nIter = 2; | |
a3dfe79c | 508 | Float_t xwht1 = (iwht1 + 0.5) * kCelWr; |
509 | Float_t xwht2 = (iwht2 + 0.5) * kCelWr; | |
fa412d9b | 510 | Float_t xwr12 = (xwht1 + xwht2) / 2; |
511 | Float_t dxw1 = xhit1 - xwr12; | |
512 | Float_t dxw2 = xhit2 - xwr12; | |
513 | Float_t egm1 = TMath::Abs(dxw1) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) ); | |
514 | Float_t egm2 = TMath::Abs(dxw2) / ( TMath::Abs(dxw1) + TMath::Abs(dxw2) ); | |
515 | zxe[0][0] = (zhit1 + zhit2 - dZY*egm1) / 2; | |
516 | zxe[1][0] = xwht1; | |
a3dfe79c | 517 | zxe[2][0] = eloss * egm1; |
fa412d9b | 518 | zxe[0][1] = (zhit1 + zhit2 + dZY*egm2) / 2; |
519 | zxe[1][1] = xwht2; | |
a3dfe79c | 520 | zxe[2][1] = eloss * egm2; |
fa412d9b | 521 | } |
bea63bea | 522 | |
fa412d9b | 523 | // Finite size of ionization region |
524 | ||
fa7cce36 | 525 | Int_t nCellZ = GetGeometry()->GetNumberOfCPVPadsZ(); |
526 | Int_t nCellX = GetGeometry()->GetNumberOfCPVPadsPhi(); | |
a3dfe79c | 527 | Int_t nz3 = (kNgamz+1)/2; |
528 | Int_t nx3 = (kNgamx+1)/2; | |
529 | cpvDigits->Expand(nIter*kNgamx*kNgamz); | |
29b077b5 | 530 | TClonesArray &ldigits = *(static_cast<TClonesArray *>(cpvDigits)); |
fa412d9b | 531 | |
532 | for (Int_t iter=0; iter<nIter; iter++) { | |
533 | ||
534 | Float_t zhit = zxe[0][iter]; | |
535 | Float_t xhit = zxe[1][iter]; | |
536 | Float_t qhit = zxe[2][iter]; | |
fa7cce36 | 537 | Float_t zcell = zhit / GetGeometry()->GetPadSizeZ(); |
538 | Float_t xcell = xhit / GetGeometry()->GetPadSizePhi(); | |
fa412d9b | 539 | if ( zcell<=0 || xcell<=0 || |
540 | zcell>=nCellZ || xcell>=nCellX) return; | |
541 | Int_t izcell = (Int_t) zcell; | |
542 | Int_t ixcell = (Int_t) xcell; | |
543 | Float_t zc = zcell - izcell - 0.5; | |
544 | Float_t xc = xcell - ixcell - 0.5; | |
a3dfe79c | 545 | for (Int_t iz=1; iz<=kNgamz; iz++) { |
fa412d9b | 546 | Int_t kzg = izcell + iz - nz3; |
547 | if (kzg<=0 || kzg>nCellZ) continue; | |
548 | Float_t zg = (Float_t)(iz-nz3) - zc; | |
a3dfe79c | 549 | for (Int_t ix=1; ix<=kNgamx; ix++) { |
fa412d9b | 550 | Int_t kxg = ixcell + ix - nx3; |
551 | if (kxg<=0 || kxg>nCellX) continue; | |
552 | Float_t xg = (Float_t)(ix-nx3) - xc; | |
553 | ||
554 | // Now calculate pad response | |
555 | Float_t qpad = CPVPadResponseFunction(qhit,zg,xg); | |
a3dfe79c | 556 | qpad += kNoise*rnor2; |
fa412d9b | 557 | if (qpad<0) continue; |
558 | ||
559 | // Fill the array with pad response ID and amplitude | |
3d402178 | 560 | new(ldigits[cpvDigits->GetEntriesFast()]) AliPHOSCPVDigit(kxg,kzg,qpad); |
fa412d9b | 561 | } |
fa412d9b | 562 | } |
fa412d9b | 563 | } |
564 | } | |
565 | ||
566 | //____________________________________________________________________________ | |
567 | Float_t AliPHOSv1::CPVPadResponseFunction(Float_t qhit, Float_t zhit, Float_t xhit) { | |
568 | // ------------------------------------------------------------------------ | |
569 | // Calculate the amplitude in one CPV pad using the | |
570 | // cumulative pad response function | |
571 | // Author: Yuri Kharlov (after Serguei Sadovski) | |
572 | // 3 October 2000 | |
573 | // ------------------------------------------------------------------------ | |
574 | ||
fa7cce36 | 575 | Double_t dz = GetGeometry()->GetPadSizeZ() / 2; |
576 | Double_t dx = GetGeometry()->GetPadSizePhi() / 2; | |
577 | Double_t z = zhit * GetGeometry()->GetPadSizeZ(); | |
578 | Double_t x = xhit * GetGeometry()->GetPadSizePhi(); | |
fa412d9b | 579 | Double_t amplitude = qhit * |
580 | (CPVCumulPadResponse(z+dz,x+dx) - CPVCumulPadResponse(z+dz,x-dx) - | |
581 | CPVCumulPadResponse(z-dz,x+dx) + CPVCumulPadResponse(z-dz,x-dx)); | |
582 | return (Float_t)amplitude; | |
7587f5a5 | 583 | } |
584 | ||
fa412d9b | 585 | //____________________________________________________________________________ |
586 | Double_t AliPHOSv1::CPVCumulPadResponse(Double_t x, Double_t y) { | |
587 | // ------------------------------------------------------------------------ | |
588 | // Cumulative pad response function | |
589 | // It includes several terms from the CF decomposition in electrostatics | |
590 | // Note: this cumulative function is wrong since omits some terms | |
591 | // but the cell amplitude obtained with it is correct because | |
592 | // these omitting terms cancel | |
593 | // Author: Yuri Kharlov (after Serguei Sadovski) | |
594 | // 3 October 2000 | |
595 | // ------------------------------------------------------------------------ | |
596 | ||
a3dfe79c | 597 | const Double_t kA=1.0; |
598 | const Double_t kB=0.7; | |
fa412d9b | 599 | |
600 | Double_t r2 = x*x + y*y; | |
601 | Double_t xy = x*y; | |
602 | Double_t cumulPRF = 0; | |
603 | for (Int_t i=0; i<=4; i++) { | |
a3dfe79c | 604 | Double_t b1 = (2*i + 1) * kB; |
fa412d9b | 605 | cumulPRF += TMath::Power(-1,i) * TMath::ATan( xy / (b1*TMath::Sqrt(b1*b1 + r2)) ); |
606 | } | |
a3dfe79c | 607 | cumulPRF *= kA/(2*TMath::Pi()); |
fa412d9b | 608 | return cumulPRF; |
609 | } | |
7eb9d12d | 610 |