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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/* History of cvs commits:
19 *
20 * $Log$
21 * Revision 1.30 2006/09/13 07:31:01 kharlov
22 * Effective C++ corrections (T.Pocheptsov)
23 *
24 * Revision 1.29 2005/05/28 14:19:05 schutz
25 * Compilation warnings fixed by T.P.
26 *
27 */
28
29//_________________________________________________________________________
30// Implementation of the PHOS manager class for fast simulations
31// Tracks particles until the reach a grossly designed PHOS module
32// Modify the particles property (momentum, energy, type) according to
33// the PHOS response function. The result is called a virtual reconstructed
34// particle.
35//
36//*-- Author: Yves Schutz (SUBATECH)
37
38// --- ROOT system ---
39
40#include <TBRIK.h>
41#include <TGeometry.h>
42#include <TNode.h>
43#include <TParticle.h>
44#include "TClonesArray.h"
45#include <TVirtualMC.h>
46
47// --- Standard library ---
48
49// --- AliRoot header files ---
50#include "AliPHOSFastRecParticle.h"
51#include "AliPHOSGeometry.h"
52#include "AliPHOSLoader.h"
53#include "AliPHOSvFast.h"
54#include "AliRun.h"
55
56ClassImp(AliPHOSvFast)
57
58AliPHOSvFast::AliPHOSvFast() :
59 fBigBoxX(0.),
60 fBigBoxY(0.),
61 fBigBoxZ(0.),
62 fFastRecParticles(0),
63 fNRecParticles(0),
64 fRan(0),
65 fResPara1(0.),
66 fResPara2(0.),
67 fResPara3(0.),
68 fPosParaA0(0.),
69 fPosParaA1(0.),
70 fPosParaB0(0.),
71 fPosParaB1(0.),
72 fPosParaB2(0.)
73{
74 // default ctor : initialize data member
75}
76
77//____________________________________________________________________________
78AliPHOSvFast::AliPHOSvFast(const char *name, const char *title):
79 AliPHOS(name,title),
80 fBigBoxX(0.),
81 fBigBoxY(0.),
82 fBigBoxZ(0.),
83 fFastRecParticles(new AliPHOSFastRecParticle::FastRecParticlesList("AliPHOSFastRecParticle", 100)),
84 fNRecParticles(0),
85 fRan(0),
86 fResPara1(0.030), // GeV
87 fResPara2(0.00003),
88 fResPara3(0.00001),
89 fPosParaA0(2.87), // mm
90 fPosParaA1(-0.0975),
91 fPosParaB0(0.257),
92 fPosParaB1(0.137),
93 fPosParaB2(0.00619)
94{
95 // ctor
96 // create the Loader
97 SetBigBox(0, GetGeometry()->GetOuterBoxSize(0) ) ;
98 SetBigBox(1, GetGeometry()->GetOuterBoxSize(3) + GetGeometry()->GetCPVBoxSize(1) ) ;
99 SetBigBox(2, GetGeometry()->GetOuterBoxSize(2) );
100}
101
102//____________________________________________________________________________
103AliPHOSvFast::~AliPHOSvFast()
104{
105 // dtor
106
107 fFastRecParticles->Delete() ;
108 delete fFastRecParticles ;
109 fFastRecParticles = 0 ;
110
111}
112
113//____________________________________________________________________________
114void AliPHOSvFast::AddRecParticle(const AliPHOSFastRecParticle & rp)
115{
116 // Add a virtually reconstructed particle to the list
117
118 new( (*fFastRecParticles)[fNRecParticles] ) AliPHOSFastRecParticle(rp) ;
119 fNRecParticles++ ;
120}
121
122//____________________________________________________________________________
123void AliPHOSvFast::BuildGeometry()
124{
125 // Build the PHOS geometry for the ROOT display
126 //BEGIN_HTML
127 /*
128 <H2>
129 PHOS FAST in ALICE displayed by root
130 </H2>
131 <H4> All Views </H4>
132 <P>
133 <CENTER>
134 <IMG Align=BOTTOM ALT="Fast All Views" SRC="../images/AliPHOSvFastAllViews.gif">
135 </CENTER></P>
136 <H4> Front View </H4>
137 <P>
138 <CENTER>
139 <IMG Align=BOTTOM ALT="Fast Front View" SRC="../images/AliPHOSvFastFrontView.gif">
140 </CENTER></P>
141 */
142 //END_HTML
143
144 const Int_t kColorPHOS = kRed ;
145
146 Double_t const kRADDEG = 180.0 / TMath::Pi() ;
147
148 new TBRIK( "BigBox", "PHOS box", "void", GetBigBox(0)/2,
149 GetBigBox(1)/2,
150 GetBigBox(2)/2 );
151
152 // position PHOS into ALICE
153
154 Float_t r = GetGeometry()->GetIPtoCrystalSurface() + GetBigBox(1) / 2.0 ;
155 Int_t number = 988 ;
156 Float_t pphi = TMath::ATan( GetBigBox(0) / ( 2.0 * GetGeometry()->GetIPtoCrystalSurface() ) ) ;
157 pphi *= kRADDEG ;
158 TNode * top = gAlice->GetGeometry()->GetNode("alice") ;
159
160 char * nodename = new char[20] ;
161 char * rotname = new char[20] ;
162
163 for( Int_t i = 1; i <= GetGeometry()->GetNModules(); i++ ) {
164 Float_t angle = pphi * 2 * ( i - GetGeometry()->GetNModules() / 2.0 - 0.5 ) ;
165 sprintf(rotname, "%s%d", "rot", number++) ;
166 new TRotMatrix(rotname, rotname, 90, angle, 90, 90 + angle, 0, 0);
167 top->cd();
168 sprintf(nodename,"%s%d", "Module", i) ;
169 Float_t x = r * TMath::Sin( angle / kRADDEG ) ;
170 Float_t y = -r * TMath::Cos( angle / kRADDEG ) ;
171 TNode * bigboxnode = new TNode(nodename, nodename, "BigBox", x, y, 0, rotname ) ;
172 bigboxnode->SetLineColor(kColorPHOS) ;
173 fNodes->Add(bigboxnode) ;
174 }
175 delete[] nodename ;
176 delete[] rotname ;
177}
178
179//____________________________________________________________________________
180void AliPHOSvFast::CreateGeometry()
181{
182 // Create the geometry for GEANT
183
184 AliPHOSvFast *phostmp = (AliPHOSvFast*)gAlice->GetModule("PHOS") ;
185
186 if ( phostmp == NULL ) {
187
188 fprintf(stderr, "PHOS detector not found!\n") ;
189 return ;
190
191 }
192
193 // Get pointer to the array containing media indeces
194 Int_t *idtmed = fIdtmed->GetArray() - 699 ;
195
196 Float_t bigbox[3] ;
197 bigbox[0] = GetBigBox(0) / 2.0 ;
198 bigbox[1] = GetBigBox(1) / 2.0 ;
199 bigbox[2] = GetBigBox(2) / 2.0 ;
200
201 gMC->Gsvolu("PHOS", "BOX ", idtmed[798], bigbox, 3) ;
202
203 // --- Position PHOS mdules in ALICE setup ---
204
205 Int_t idrotm[99] ;
206 Double_t const kRADDEG = 180.0 / TMath::Pi() ;
207
208 for( Int_t i = 1; i <= GetGeometry()->GetNModules(); i++ ) {
209
210 Float_t angle = GetGeometry()->GetPHOSAngle(i) ;
211 AliMatrix(idrotm[i-1], 90.0, angle, 90.0, 90.0+angle, 0.0, 0.0) ;
212
213 Float_t r = GetGeometry()->GetIPtoCrystalSurface() + GetBigBox(1) / 2.0 ;
214
215 Float_t xP1 = r * TMath::Sin( angle / kRADDEG ) ;
216 Float_t yP1 = -r * TMath::Cos( angle / kRADDEG ) ;
217 gMC->Gspos("PHOS", i, "ALIC", xP1, yP1, 0.0, idrotm[i-1], "ONLY") ;
218
219 } // for GetNModules
220
221}
222
223
224//____________________________________________________________________________
225void AliPHOSvFast::Init(void)
226{
227 // Prints out an information message
228
229 Int_t i;
230
231 printf("\n");
232 for(i=0;i<35;i++) printf("*");
233 printf(" FAST PHOS_INIT ");
234 for(i=0;i<35;i++) printf("*");
235 printf("\n");
236
237 // Here the PHOS initialisation code (if any!)
238
239 for(i=0;i<80;i++) printf("*");
240 printf("\n");
241
242}
243
244//___________________________________________________________________________
245Float_t AliPHOSvFast::GetBigBox(Int_t index) const
246{
247 // Get the X, Y or Z dimension of the box describing a PHOS module
248
249 Float_t rv = 0 ;
250
251 switch (index) {
252 case 0:
253 rv = fBigBoxX ;
254 break ;
255 case 1:
256 rv = fBigBoxY ;
257 break ;
258 case 2:
259 rv = fBigBoxZ ;
260 break ;
261 }
262 return rv ;
263}
264//___________________________________________________________________________
265
266void AliPHOSvFast::MakeBranch(Option_t* opt)
267{
268 // Create new branch in the current reconstructed Root Tree
269 AliDetector::MakeBranch(opt);
270 const char *cd = strstr(opt,"R");
271
272 if (fFastRecParticles && fLoader->TreeR() && cd) {
273 MakeBranchInTree(fLoader->TreeR(), GetName(), &fFastRecParticles, fBufferSize, 0);
274 }
275}
276//____________________________________________________________________________
277
278Double_t AliPHOSvFast::MakeEnergy(Double_t energy)
279{
280 // Smears the energy according to the energy dependent energy resolution.
281 // A gaussian distribution is assumed
282
283 Double_t sigma = SigmaE(energy) ;
284 return fRan.Gaus(energy, sigma) ;
285}
286//____________________________________________________________________________
287
288TVector3 AliPHOSvFast::MakePosition(Double_t energy, TVector3 pos, Double_t theta, Double_t phi)
289{
290 // Smears the impact position according to the energy dependent position resolution
291 // A gaussian position distribution is assumed
292
293 TVector3 newpos ;
294 Double_t sigma = SigmaP( energy, theta*180./TMath::Pi() ) ;
295 Double_t x = fRan.Gaus( pos.X(), sigma ) ;
296 sigma = SigmaP( energy, phi*180./TMath::Pi() ) ;
297 Double_t z = fRan.Gaus( pos.Z(), sigma ) ;
298 Double_t y = pos.Y() ;
299
300 newpos.SetX(x) ;
301 newpos.SetY(y) ;
302 newpos.SetZ(z) ;
303
304 return newpos ;
305}
306
307//____________________________________________________________________________
308void AliPHOSvFast::MakeRecParticle(Int_t modid, TVector3 pos, AliPHOSFastRecParticle & rp)
309{
310 // Modify the primary particle properties according
311 // 1. the response function of PHOS
312 // 2. the performance of the EMC+PPSD setup
313
314 Int_t type = MakeType( rp ) ;
315 rp.SetType(type) ;
316
317
318 // get the detected energy
319
320 TLorentzVector momentum ;
321 rp.Momentum(momentum) ;
322 Double_t kineticenergy = TMath::Sqrt( TMath::Power(momentum.E(), 2) - TMath::Power(rp.GetMass(), 2) ) ;
323 Double_t modifiedkineticenergy = MakeEnergy(kineticenergy ) ;
324 Double_t modifiedenergy = TMath::Sqrt( TMath::Power(modifiedkineticenergy, 2)
325 + TMath::Power( rp.GetMass(), 2) ) ;
326
327 // get the angle of incidence
328
329 Double_t incidencetheta = 90. * TMath::Pi() /180 - rp.Theta() ;
330 Double_t incidencephi = ( 270 + GetGeometry()->GetPHOSAngle(modid) ) * TMath::Pi() / 180. - rp.Phi() ;
331
332 // get the detected direction
333
334 TVector3 modifiedposition = MakePosition(kineticenergy, pos, incidencetheta, incidencephi) ;
335 modifiedposition *= modifiedkineticenergy / modifiedposition.Mag() ;
336
337 // Set the modified 4-momentum of the reconstructed particle
338
339 rp.SetMomentum(modifiedposition.X(), modifiedposition.Y(), modifiedposition.Z(), modifiedenergy) ;
340
341 }
342
343//____________________________________________________________________________
344Int_t AliPHOSvFast::MakeType(AliPHOSFastRecParticle & rp )
345{
346 // Generate a particle type using the performance of the EMC+PPSD setup
347
348 Int_t rv = AliPHOSFastRecParticle::kUNDEFINED ;
349 Int_t charge = (Int_t)rp.GetPDG()->Charge() ;
350 Int_t test ;
351 Float_t ran ;
352 if ( charge != 0 && ( TMath::Abs(rp.GetPdgCode()) != 11 ) )
353 test = - 1 ;
354 else
355 test = rp.GetPdgCode() ;
356
357 Fatal("MakeType", "SHOULD NOT BE USED until values of probabilities are properly set ") ;
358 // NB: ALL VALUES SHOULD BE CHECKED !!!!
359 switch (test) {
360
361 case 22: // it's a photon // NB: ALL VALUES SHOLD BE CHECKED !!!!
362 ran = fRan.Rndm() ;
363 if( ran <= 0.9498 )
364 rv = AliPHOSFastRecParticle::kNEUTRALHAFAST ;
365 else
366 rv = AliPHOSFastRecParticle::kNEUTRALEMFAST ;
367 break ;
368
369 case 2112: // it's a neutron
370 ran = fRan.Rndm() ;
371 if ( ran <= 0.9998 )
372 rv = AliPHOSFastRecParticle::kNEUTRALHASLOW ;
373 else
374 rv = AliPHOSFastRecParticle::kNEUTRALEMSLOW ;
375 break ;
376
377 case -2112: // it's a anti-neutron
378 ran = fRan.Rndm() ;
379 if ( ran <= 0.9984 )
380 rv = AliPHOSFastRecParticle::kNEUTRALHASLOW ;
381 else
382 rv = AliPHOSFastRecParticle::kNEUTRALEMSLOW ;
383 break ;
384
385 case 11: // it's a electron
386 ran = fRan.Rndm() ;
387 if ( ran <= 0.9996 )
388 rv = AliPHOSFastRecParticle::kCHARGEDEMFAST ;
389 else
390 rv = AliPHOSFastRecParticle::kCHARGEDHAFAST ;
391 break;
392
393 case -11: // it's a positon
394 ran = fRan.Rndm() ;
395 if ( ran <= 0.9996 )
396 rv = AliPHOSFastRecParticle::kCHARGEDEMFAST ;
397 else
398 rv = AliPHOSFastRecParticle::kCHARGEDHAFAST ;
399 break;
400
401 case -1: // it's a charged
402 ran = fRan.Rndm() ;
403 if ( ran <= 0.9996 )
404 rv = AliPHOSFastRecParticle::kCHARGEDHAFAST ;
405 else
406 rv = AliPHOSFastRecParticle::kNEUTRALHAFAST ;
407
408 break ;
409 }
410
411
412 return rv ;
413}
414
415//___________________________________________________________________________
416void AliPHOSvFast::ResetPoints()
417{
418 // This overloads the method in AliDetector
419
420 ResetFastRecParticles() ;
421}
422
423//___________________________________________________________________________
424void AliPHOSvFast::ResetFastRecParticles()
425{
426 // Resets the list of virtual reconstructed particles
427
428 if (fFastRecParticles)
429 fFastRecParticles->Clear() ;
430 fNRecParticles = 0 ;
431}
432
433//___________________________________________________________________________
434void AliPHOSvFast::SetBigBox(Int_t index, Float_t value)
435{
436 // Set the size of the Box describing a PHOS module
437
438 switch (index) {
439 case 0:
440 fBigBoxX = value ;
441 break ;
442 case 1:
443 fBigBoxY = value ;
444 break ;
445 case 2:
446 fBigBoxZ = value ;
447 break ;
448 }
449
450}
451
452//____________________________________________________________________________
453Double_t AliPHOSvFast::SigmaE(Double_t energy)
454{
455 // Calculates the energy dependent energy resolution
456
457 Double_t rv = -1 ;
458
459 rv = TMath::Sqrt( TMath::Power(fResPara1/energy, 2)
460 + TMath::Power(fResPara2/TMath::Sqrt(energy), 2)
461 + TMath::Power(fResPara3, 2) ) ;
462
463 return rv * energy ;
464}
465
466//____________________________________________________________________________
467Double_t AliPHOSvFast::SigmaP(Double_t energy, Double_t incidence)
468{
469 // Calculates the energy dependent position resolution
470
471 Double_t paraA = fPosParaA0 + fPosParaA1 * incidence ;
472 Double_t paraB = fPosParaB0 + fPosParaB1 * incidence + fPosParaB2 * incidence * incidence ;
473
474 return ( paraA / TMath::Sqrt(energy) + paraB ) * 0.1 ; // in cm
475}
476
477//____________________________________________________________________________
478void AliPHOSvFast::StepManager(void)
479{
480 // Only verifies if the particle reaches PHOS and stops the tracking
481
482 TLorentzVector lv ;
483 gMC->TrackPosition(lv) ;
484 TVector3 pos = lv.Vect() ;
485 Int_t modid ;
486 gMC->CurrentVolID(modid);
487
488 Float_t energy = gMC->Etot() ; //Total energy of current track
489
490 //Calculating mass of current particle
491 TDatabasePDG * pdg = TDatabasePDG::Instance() ;
492 TParticlePDG * partPDG = pdg->GetParticle(gMC->TrackPid()) ;
493 Float_t mass = partPDG->Mass() ;
494
495 if(energy > mass){
496 pos.SetMag(TMath::Sqrt(energy*energy-mass*mass)) ;
497 TLorentzVector pTrack(pos, energy) ;
498
499 TParticle * part = new TParticle(gMC->TrackPid(), 0,-1,-1,-1,-1, pTrack, lv) ;
500
501 AliPHOSFastRecParticle rp(*part) ;
502
503 // Adds the response of PHOS to the particle
504 MakeRecParticle(modid, pos, rp) ;
505
506 // add the `track' particle to the FastRecParticles list
507
508 AddRecParticle(rp) ;
509
510 part->Delete() ;
511 }
512 // stop the track as soon PHOS is reached
513
514 gMC->StopTrack() ;
515
516}
517