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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 of the PHOS manager class for fast simulations | |
20 | // Tracks particles until the reach a grossly designed PHOS module | |
21 | // Modify the particles property (momentum, energy, type) according to | |
22 | // the PHOS response function. The result is called a virtual reconstructed | |
23 | // particle. | |
24 | // | |
25 | //*-- Author: Yves Schutz (SUBATECH) | |
26 | ||
27 | // --- ROOT system --- | |
28 | ||
29 | #include "TBRIK.h" | |
30 | #include "TNode.h" | |
31 | #include "TParticle.h" | |
94de3818 | 32 | #include "TTree.h" |
33 | #include "TGeometry.h" | |
2ab0c725 | 34 | #include "TFile.h" |
5f20d3fb | 35 | |
36 | // --- Standard library --- | |
37 | ||
5f20d3fb | 38 | // --- AliRoot header files --- |
cede8016 | 39 | #include "AliPHOSFastRecParticle.h" |
40 | #include "AliPHOSGeometry.h" | |
5f20d3fb | 41 | #include "AliPHOSv4.h" |
7b7c1533 | 42 | #include "AliPHOSGetter.h" |
5f20d3fb | 43 | #include "AliRun.h" |
44 | #include "AliConst.h" | |
45 | ||
46 | ClassImp(AliPHOSv4) | |
47 | ||
735e58f1 | 48 | //____________________________________________________________________________ |
33faac69 | 49 | AliPHOSv4::AliPHOSv4() : AliPHOS() |
735e58f1 | 50 | { |
51 | // default ctor : initialize data member | |
52 | fBigBoxX = 0. ; | |
53 | fBigBoxY = 0. ; | |
54 | fBigBoxZ = 0. ; | |
55 | fFastRecParticles = 0 ; | |
56 | fNRecParticles = 0 ; | |
57 | fRan = 0 ; | |
58 | fResPara1 = 0. ; | |
59 | fResPara2 = 0. ; | |
60 | fResPara3 = 0. ; | |
61 | fPosParaA0 = 0. ; | |
62 | fPosParaA1 = 0. ; | |
63 | fPosParaB0 = 0. ; | |
64 | fPosParaB1 = 0. ; | |
65 | fPosParaB2 = 0. ; | |
66 | ||
67 | } | |
68 | ||
5f20d3fb | 69 | //____________________________________________________________________________ |
70 | AliPHOSv4::AliPHOSv4(const char *name, const char *title): | |
71 | AliPHOS(name,title) | |
72 | { | |
73 | // ctor | |
74 | ||
7b7c1533 | 75 | |
76 | // create the geometry parameters object | |
77 | // and post it to a folder (Post retrieves the correct geometry) | |
c4864d2c | 78 | AliPHOSGetter::GetInstance(gDirectory->GetName(), 0)->PostGeometry() ; |
aafe457d | 79 | |
fa7cce36 | 80 | SetBigBox(0, GetGeometry()->GetOuterBoxSize(0) ) ; |
81 | SetBigBox(1, GetGeometry()->GetOuterBoxSize(1) + GetGeometry()->GetCPVBoxSize(1) ) ; | |
82 | SetBigBox(2, GetGeometry()->GetOuterBoxSize(0) ); | |
aafe457d | 83 | |
84 | fNRecParticles = 0 ; | |
85 | fFastRecParticles = new AliPHOSFastRecParticle::FastRecParticlesList("AliPHOSFastRecParticle", 100) ; | |
5cbba5aa | 86 | |
aafe457d | 87 | fResPara1 = 0.030 ; // GeV |
88 | fResPara2 = 0.00003 ; | |
89 | fResPara3 = 0.00001 ; | |
90 | ||
91 | fPosParaA0 = 2.87 ; // mm | |
92 | fPosParaA1 = -0.0975 ; | |
93 | fPosParaB0 = 0.257 ; | |
94 | fPosParaB1 = 0.137 ; | |
95 | fPosParaB2 = 0.00619 ; | |
5f20d3fb | 96 | } |
97 | ||
98 | //____________________________________________________________________________ | |
99 | AliPHOSv4::~AliPHOSv4() | |
100 | { | |
101 | // dtor | |
102 | ||
103 | fFastRecParticles->Delete() ; | |
104 | delete fFastRecParticles ; | |
105 | fFastRecParticles = 0 ; | |
106 | ||
107 | } | |
108 | ||
109 | //____________________________________________________________________________ | |
110 | void AliPHOSv4::AddRecParticle(const AliPHOSFastRecParticle & rp) | |
111 | { | |
112 | // Add a virtually reconstructed particle to the list | |
113 | ||
114 | new( (*fFastRecParticles)[fNRecParticles] ) AliPHOSFastRecParticle(rp) ; | |
115 | fNRecParticles++ ; | |
116 | } | |
117 | ||
118 | //____________________________________________________________________________ | |
119 | void AliPHOSv4::BuildGeometry() | |
120 | { | |
121 | // Build the PHOS geometry for the ROOT display | |
122 | //BEGIN_HTML | |
123 | /* | |
124 | <H2> | |
125 | PHOS FAST in ALICE displayed by root | |
126 | </H2> | |
127 | <H4> All Views </H4> | |
128 | <P> | |
129 | <CENTER> | |
130 | <IMG Align=BOTTOM ALT="Fast All Views" SRC="../images/AliPHOSv4AllViews.gif"> | |
131 | </CENTER></P> | |
132 | <H4> Front View </H4> | |
133 | <P> | |
134 | <CENTER> | |
135 | <IMG Align=BOTTOM ALT="Fast Front View" SRC="../images/AliPHOSv4FrontView.gif"> | |
136 | </CENTER></P> | |
137 | */ | |
138 | //END_HTML | |
139 | ||
140 | const Int_t kColorPHOS = kRed ; | |
141 | ||
142 | Double_t const kRADDEG = 180.0 / kPI ; | |
143 | ||
144 | new TBRIK( "BigBox", "PHOS box", "void", GetBigBox(0)/2, | |
145 | GetBigBox(1)/2, | |
146 | GetBigBox(2)/2 ); | |
147 | ||
148 | // position PHOS into ALICE | |
149 | ||
fa7cce36 | 150 | Float_t r = GetGeometry()->GetIPtoCrystalSurface() + GetBigBox(1) / 2.0 ; |
5f20d3fb | 151 | Int_t number = 988 ; |
fa7cce36 | 152 | Float_t pphi = TMath::ATan( GetBigBox(0) / ( 2.0 * GetGeometry()->GetIPtoCrystalSurface() ) ) ; |
5f20d3fb | 153 | pphi *= kRADDEG ; |
154 | TNode * top = gAlice->GetGeometry()->GetNode("alice") ; | |
155 | ||
156 | char * nodename = new char[20] ; | |
157 | char * rotname = new char[20] ; | |
158 | ||
fa7cce36 | 159 | for( Int_t i = 1; i <= GetGeometry()->GetNModules(); i++ ) { |
160 | Float_t angle = pphi * 2 * ( i - GetGeometry()->GetNModules() / 2.0 - 0.5 ) ; | |
5f20d3fb | 161 | sprintf(rotname, "%s%d", "rot", number++) ; |
162 | new TRotMatrix(rotname, rotname, 90, angle, 90, 90 + angle, 0, 0); | |
163 | top->cd(); | |
164 | sprintf(nodename,"%s%d", "Module", i) ; | |
165 | Float_t x = r * TMath::Sin( angle / kRADDEG ) ; | |
166 | Float_t y = -r * TMath::Cos( angle / kRADDEG ) ; | |
167 | TNode * bigboxnode = new TNode(nodename, nodename, "BigBox", x, y, 0, rotname ) ; | |
168 | bigboxnode->SetLineColor(kColorPHOS) ; | |
169 | fNodes->Add(bigboxnode) ; | |
170 | } | |
171 | delete[] nodename ; | |
172 | delete[] rotname ; | |
173 | } | |
174 | ||
175 | //____________________________________________________________________________ | |
176 | void AliPHOSv4::CreateGeometry() | |
177 | { | |
178 | // Create the geometry for GEANT | |
179 | ||
29b077b5 | 180 | AliPHOSv4 *phostmp = dynamic_cast<AliPHOSv4*>(gAlice->GetModule("PHOS")) ; |
5f20d3fb | 181 | |
182 | if ( phostmp == NULL ) { | |
183 | ||
184 | fprintf(stderr, "PHOS detector not found!\n") ; | |
185 | return ; | |
186 | ||
187 | } | |
188 | ||
189 | // Get pointer to the array containing media indeces | |
190 | Int_t *idtmed = fIdtmed->GetArray() - 699 ; | |
191 | ||
192 | Float_t bigbox[3] ; | |
193 | bigbox[0] = GetBigBox(0) / 2.0 ; | |
194 | bigbox[1] = GetBigBox(1) / 2.0 ; | |
195 | bigbox[2] = GetBigBox(2) / 2.0 ; | |
196 | ||
197 | gMC->Gsvolu("PHOS", "BOX ", idtmed[798], bigbox, 3) ; | |
198 | ||
199 | // --- Position PHOS mdules in ALICE setup --- | |
200 | ||
201 | Int_t idrotm[99] ; | |
202 | Double_t const kRADDEG = 180.0 / kPI ; | |
203 | ||
fa7cce36 | 204 | for( Int_t i = 1; i <= GetGeometry()->GetNModules(); i++ ) { |
5f20d3fb | 205 | |
fa7cce36 | 206 | Float_t angle = GetGeometry()->GetPHOSAngle(i) ; |
5f20d3fb | 207 | AliMatrix(idrotm[i-1], 90.0, angle, 90.0, 90.0+angle, 0.0, 0.0) ; |
208 | ||
fa7cce36 | 209 | Float_t r = GetGeometry()->GetIPtoCrystalSurface() + GetBigBox(1) / 2.0 ; |
5f20d3fb | 210 | |
211 | Float_t xP1 = r * TMath::Sin( angle / kRADDEG ) ; | |
212 | Float_t yP1 = -r * TMath::Cos( angle / kRADDEG ) ; | |
213 | gMC->Gspos("PHOS", i, "ALIC", xP1, yP1, 0.0, idrotm[i-1], "ONLY") ; | |
214 | ||
215 | } // for GetNModules | |
216 | ||
217 | } | |
218 | ||
219 | ||
220 | //____________________________________________________________________________ | |
221 | void AliPHOSv4::Init(void) | |
222 | { | |
223 | // Prints out an information message | |
224 | ||
225 | Int_t i; | |
226 | ||
227 | printf("\n"); | |
228 | for(i=0;i<35;i++) printf("*"); | |
229 | printf(" FAST PHOS_INIT "); | |
230 | for(i=0;i<35;i++) printf("*"); | |
231 | printf("\n"); | |
232 | ||
233 | // Here the PHOS initialisation code (if any!) | |
234 | ||
235 | for(i=0;i<80;i++) printf("*"); | |
236 | printf("\n"); | |
237 | ||
238 | } | |
239 | ||
240 | //___________________________________________________________________________ | |
baef0810 | 241 | Float_t AliPHOSv4::GetBigBox(Int_t index) const |
5f20d3fb | 242 | { |
243 | // Get the X, Y or Z dimension of the box describing a PHOS module | |
244 | ||
245 | Float_t rv = 0 ; | |
246 | ||
247 | switch (index) { | |
248 | case 0: | |
249 | rv = fBigBoxX ; | |
250 | break ; | |
251 | case 1: | |
252 | rv = fBigBoxY ; | |
253 | break ; | |
254 | case 2: | |
255 | rv = fBigBoxZ ; | |
256 | break ; | |
257 | } | |
258 | return rv ; | |
259 | } | |
260 | ||
261 | //___________________________________________________________________________ | |
9e1a0ddb | 262 | void AliPHOSv4::MakeBranch(Option_t* opt, const char *file) |
5f20d3fb | 263 | { |
264 | // Create new branch in the current reconstructed Root Tree | |
265 | ||
2ab0c725 | 266 | AliDetector::MakeBranch(opt,file) ; |
5f20d3fb | 267 | |
268 | char branchname[10]; | |
269 | sprintf(branchname,"%s",GetName()); | |
5cf7bbad | 270 | const char *cd = strstr(opt,"R"); |
5f20d3fb | 271 | |
272 | if (fFastRecParticles && gAlice->TreeR() && cd) { | |
9e1a0ddb | 273 | MakeBranchInTree(gAlice->TreeR(), |
274 | branchname, &fFastRecParticles, fBufferSize, file); | |
5f20d3fb | 275 | } |
276 | } | |
277 | ||
278 | //____________________________________________________________________________ | |
279 | Double_t AliPHOSv4::MakeEnergy(const Double_t energy) | |
280 | { | |
281 | // Smears the energy according to the energy dependent energy resolution. | |
282 | // A gaussian distribution is assumed | |
283 | ||
284 | Double_t sigma = SigmaE(energy) ; | |
285 | return fRan.Gaus(energy, sigma) ; | |
286 | } | |
287 | ||
288 | //____________________________________________________________________________ | |
289 | TVector3 AliPHOSv4::MakePosition(const Double_t energy, const TVector3 pos, const Double_t theta, const Double_t phi) | |
290 | { | |
291 | // Smears the impact position according to the energy dependent position resolution | |
292 | // A gaussian position distribution is assumed | |
293 | ||
294 | TVector3 newpos ; | |
295 | Double_t sigma = SigmaP( energy, theta*180./TMath::Pi() ) ; | |
296 | Double_t x = fRan.Gaus( pos.X(), sigma ) ; | |
297 | sigma = SigmaP( energy, phi*180./TMath::Pi() ) ; | |
298 | Double_t z = fRan.Gaus( pos.Z(), sigma ) ; | |
299 | Double_t y = pos.Y() ; | |
300 | ||
301 | newpos.SetX(x) ; | |
302 | newpos.SetY(y) ; | |
303 | newpos.SetZ(z) ; | |
304 | ||
305 | return newpos ; | |
306 | } | |
307 | ||
308 | //____________________________________________________________________________ | |
309 | void AliPHOSv4::MakeRecParticle(const Int_t modid, const TVector3 pos, AliPHOSFastRecParticle & rp) | |
310 | { | |
311 | // Modify the primary particle properties according | |
312 | // 1. the response function of PHOS | |
313 | // 2. the performance of the EMC+PPSD setup | |
314 | ||
315 | Int_t type = MakeType( rp ) ; | |
316 | rp.SetType(type) ; | |
317 | ||
318 | ||
319 | // get the detected energy | |
320 | ||
321 | TLorentzVector momentum ; | |
322 | rp.Momentum(momentum) ; | |
323 | Double_t kineticenergy = TMath::Sqrt( TMath::Power(momentum.E(), 2) - TMath::Power(rp.GetMass(), 2) ) ; | |
324 | Double_t modifiedkineticenergy = MakeEnergy(kineticenergy ) ; | |
325 | Double_t modifiedenergy = TMath::Sqrt( TMath::Power(modifiedkineticenergy, 2) | |
326 | + TMath::Power( rp.GetMass(), 2) ) ; | |
327 | ||
328 | // get the angle of incidence | |
329 | ||
330 | Double_t incidencetheta = 90. * TMath::Pi() /180 - rp.Theta() ; | |
fa7cce36 | 331 | Double_t incidencephi = ( 270 + GetGeometry()->GetPHOSAngle(modid) ) * TMath::Pi() / 180. - rp.Phi() ; |
5f20d3fb | 332 | |
333 | // get the detected direction | |
334 | ||
335 | TVector3 modifiedposition = MakePosition(kineticenergy, pos, incidencetheta, incidencephi) ; | |
336 | modifiedposition *= modifiedkineticenergy / modifiedposition.Mag() ; | |
337 | ||
338 | // Set the modified 4-momentum of the reconstructed particle | |
339 | ||
340 | rp.SetMomentum(modifiedposition.X(), modifiedposition.Y(), modifiedposition.Z(), modifiedenergy) ; | |
341 | ||
342 | } | |
343 | ||
344 | //____________________________________________________________________________ | |
345 | Int_t AliPHOSv4::MakeType(AliPHOSFastRecParticle & rp ) | |
346 | { | |
347 | // Generate a particle type using the performance of the EMC+PPSD setup | |
348 | ||
349 | Int_t rv = AliPHOSFastRecParticle::kUNDEFINED ; | |
350 | Int_t charge = (Int_t)rp.GetPDG()->Charge() ; | |
351 | Int_t test ; | |
352 | Float_t ran ; | |
353 | if ( charge != 0 && ( TMath::Abs(rp.GetPdgCode()) != 11 ) ) | |
354 | test = - 1 ; | |
355 | else | |
356 | test = rp.GetPdgCode() ; | |
357 | ||
358 | switch (test) { | |
359 | ||
360 | case 22: // it's a photon | |
361 | ran = fRan.Rndm() ; | |
362 | if ( ran <= 0.5 ) // 50 % | |
363 | rv = AliPHOSFastRecParticle::kGAMMA ; | |
364 | else { | |
365 | ran = fRan.Rndm() ; | |
366 | if( ran <= 0.9498 ) | |
367 | rv = AliPHOSFastRecParticle::kNEUTRALEM ; | |
368 | else | |
369 | rv = AliPHOSFastRecParticle::kNEUTRALHA ; | |
370 | } | |
371 | break ; | |
372 | ||
373 | case 2112: // it's a neutron | |
374 | ran = fRan.Rndm() ; | |
375 | if ( ran <= 0.9998 ) | |
376 | rv = AliPHOSFastRecParticle::kNEUTRALHA ; | |
377 | else | |
378 | rv = AliPHOSFastRecParticle::kNEUTRALEM ; | |
379 | break ; | |
380 | ||
381 | case -2112: // it's a anti-neutron | |
382 | ran = fRan.Rndm() ; | |
383 | if ( ran <= 0.9984 ) | |
384 | rv = AliPHOSFastRecParticle::kNEUTRALHA ; | |
385 | else | |
386 | rv = AliPHOSFastRecParticle::kNEUTRALEM ; | |
387 | break ; | |
388 | ||
389 | case 11: // it's a electron | |
390 | ran = fRan.Rndm() ; | |
391 | if ( ran <= 0.9996 ) | |
392 | rv = AliPHOSFastRecParticle::kELECTRON ; | |
393 | else | |
394 | rv = AliPHOSFastRecParticle::kCHARGEDHA ; | |
395 | break; | |
396 | ||
397 | case -11: // it's a positon | |
398 | ran = fRan.Rndm() ; | |
399 | if ( ran <= 0.9996 ) | |
400 | rv = AliPHOSFastRecParticle::kELECTRON ; | |
401 | else | |
402 | rv = AliPHOSFastRecParticle::kCHARGEDHA ; | |
403 | break; | |
404 | ||
405 | case -1: // it's a charged | |
406 | ran = fRan.Rndm() ; | |
407 | if ( ran <= 0.9996 ) | |
408 | rv = AliPHOSFastRecParticle::kCHARGEDHA ; | |
409 | else | |
410 | rv = AliPHOSFastRecParticle::kGAMMA ; | |
411 | ||
412 | break ; | |
413 | } | |
414 | ||
415 | ||
416 | return rv ; | |
417 | } | |
418 | ||
419 | //___________________________________________________________________________ | |
420 | void AliPHOSv4::ResetPoints() | |
421 | { | |
422 | // This overloads the method in AliDetector | |
423 | ||
424 | ResetFastRecParticles() ; | |
425 | } | |
426 | ||
427 | //___________________________________________________________________________ | |
428 | void AliPHOSv4::ResetFastRecParticles() | |
429 | { | |
430 | // Resets the list of virtual reconstructed particles | |
431 | ||
432 | if (fFastRecParticles) | |
433 | fFastRecParticles->Clear() ; | |
434 | fNRecParticles = 0 ; | |
435 | } | |
436 | ||
437 | //___________________________________________________________________________ | |
438 | void AliPHOSv4::SetBigBox(Int_t index, Float_t value) | |
439 | { | |
440 | // Set the size of the Box describing a PHOS module | |
441 | ||
442 | switch (index) { | |
443 | case 0: | |
444 | fBigBoxX = value ; | |
445 | break ; | |
446 | case 1: | |
447 | fBigBoxY = value ; | |
448 | break ; | |
449 | case 2: | |
450 | fBigBoxZ = value ; | |
451 | break ; | |
452 | } | |
453 | ||
454 | } | |
455 | ||
456 | //____________________________________________________________________________ | |
457 | Double_t AliPHOSv4::SigmaE(Double_t energy) | |
458 | { | |
459 | // Calculates the energy dependent energy resolution | |
460 | ||
461 | Double_t rv = -1 ; | |
462 | ||
463 | rv = TMath::Sqrt( TMath::Power(fResPara1/energy, 2) | |
464 | + TMath::Power(fResPara2/TMath::Sqrt(energy), 2) | |
465 | + TMath::Power(fResPara3, 2) ) ; | |
466 | ||
467 | return rv * energy ; | |
468 | } | |
469 | ||
470 | //____________________________________________________________________________ | |
9d496c8c | 471 | Double_t AliPHOSv4::SigmaP(Double_t energy, Double_t incidence) |
5f20d3fb | 472 | { |
473 | // Calculates the energy dependent position resolution | |
474 | ||
475 | Double_t paraA = fPosParaA0 + fPosParaA1 * incidence ; | |
476 | Double_t paraB = fPosParaB0 + fPosParaB1 * incidence + fPosParaB2 * incidence * incidence ; | |
477 | ||
478 | return ( paraA / TMath::Sqrt(energy) + paraB ) * 0.1 ; // in cm | |
479 | } | |
480 | ||
481 | //____________________________________________________________________________ | |
482 | void AliPHOSv4::StepManager(void) | |
483 | { | |
484 | // Only verifies if the particle reaches PHOS and stops the tracking | |
5cbba5aa | 485 | |
5f20d3fb | 486 | Int_t primary = gAlice->GetPrimary( gAlice->CurrentTrack() ); |
5cbba5aa | 487 | |
5f20d3fb | 488 | TLorentzVector lv ; |
489 | gMC->TrackPosition(lv) ; | |
490 | TVector3 pos = lv.Vect() ; | |
491 | Int_t modid ; | |
492 | gMC->CurrentVolID(modid); | |
493 | ||
2f04ed65 | 494 | Float_t energy = gMC->Etot() ; //Total energy of current track |
5cbba5aa | 495 | |
496 | //Calculating mass of current particle | |
2f04ed65 | 497 | TDatabasePDG * pdg = TDatabasePDG::Instance() ; |
498 | TParticlePDG * partPDG = pdg->GetParticle(gMC->TrackPid()) ; | |
5cbba5aa | 499 | Float_t mass = partPDG->Mass() ; |
5f20d3fb | 500 | |
2f04ed65 | 501 | if(energy > mass){ |
502 | pos.SetMag(TMath::Sqrt(energy*energy-mass*mass)) ; | |
503 | TLorentzVector pTrack(pos, energy) ; | |
5cbba5aa | 504 | |
505 | TParticle * part = new TParticle(gMC->TrackPid(), 0,-1,-1,-1,-1, pTrack, lv) ; | |
506 | ||
507 | AliPHOSFastRecParticle rp(*part) ; | |
508 | rp.SetPrimary(primary) ; | |
509 | ||
510 | // Adds the response of PHOS to the particle | |
511 | MakeRecParticle(modid, pos, rp) ; | |
512 | ||
513 | // add the `track' particle to the FastRecParticles list | |
5f20d3fb | 514 | |
5cbba5aa | 515 | AddRecParticle(rp) ; |
5f20d3fb | 516 | |
5cbba5aa | 517 | part->Delete() ; |
518 | } | |
5f20d3fb | 519 | // stop the track as soon PHOS is reached |
520 | ||
521 | gMC->StopTrack() ; | |
522 | ||
523 | } | |
524 |