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16bf9884 | 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 | ||
88cb7938 | 16 | /* $Id$ */ |
ee7e3ede | 17 | |
16bf9884 | 18 | /////////////////////////////////////////////////////////////////////////////// |
19 | // // | |
20 | // Simple TRD Monte Carlo class // | |
21 | // // | |
22 | /////////////////////////////////////////////////////////////////////////////// | |
23 | ||
24 | #include <stdlib.h> | |
25 | ||
26 | #include <TLorentzVector.h> | |
27 | ||
28 | #include "AliRun.h" | |
16bf9884 | 29 | #include "AliTRDgeometry.h" |
88cb7938 | 30 | #include "AliTRDparameter.h" |
31 | #include "AliTRDsimpleMC.h" | |
16bf9884 | 32 | #include "AliTRDv1.h" |
5443e65e | 33 | #include "AliTRDparameter.h" |
5d12ce38 | 34 | #include "AliMC.h" |
16bf9884 | 35 | |
36 | ClassImp(AliTRDsimpleMC) | |
37 | ||
38 | //_____________________________________________________________________________ | |
4c475d27 | 39 | AliTRDsimpleMC::AliTRDsimpleMC() |
16bf9884 | 40 | { |
41 | // | |
42 | // AliTRDsimpleMC default constructor | |
43 | // | |
44 | ||
45 | fMaxStep = 0.0; | |
46 | fNStep = 0; | |
47 | fTrack = 0; | |
48 | fTrackPx = 0.0; | |
49 | fTrackPy = 0.0; | |
50 | fTrackPz = 0.0; | |
51 | fTrackPtot = 0.0; | |
52 | fTrackEtot = 0.0; | |
53 | fTrackX = 0.0; | |
54 | fTrackY = 0.0; | |
55 | fTrackZ = 0.0; | |
56 | fTrackStep = 0.0; | |
57 | fTrackPid = 0; | |
58 | fTrackCharge = 0.0; | |
59 | fTrackMass = 0.0; | |
60 | fTrackEntering = kFALSE; | |
61 | ||
62 | fTRD = NULL; | |
5443e65e | 63 | fPar = NULL; |
16bf9884 | 64 | |
65 | } | |
66 | ||
67 | //_____________________________________________________________________________ | |
68 | AliTRDsimpleMC::AliTRDsimpleMC(const char *name, const char *title) | |
642f15cf | 69 | :TVirtualMC(name,title,kFALSE) |
16bf9884 | 70 | { |
71 | // | |
72 | // AliTRDsimpleMC default constructor | |
73 | // | |
74 | ||
75 | fMaxStep = 0.0; | |
76 | fNStep = 0; | |
77 | fTrack = 0; | |
78 | fTrackPx = 0.0; | |
79 | fTrackPy = 0.0; | |
80 | fTrackPz = 0.0; | |
81 | fTrackPtot = 0.0; | |
82 | fTrackEtot = 0.0; | |
83 | fTrackX = 0.0; | |
84 | fTrackY = 0.0; | |
85 | fTrackZ = 0.0; | |
86 | fTrackStep = 0.0; | |
87 | fTrackPid = 0; | |
88 | fTrackCharge = 0.0; | |
89 | fTrackMass = 0.0; | |
90 | fTrackEntering = kFALSE; | |
91 | ||
92 | fTRD = NULL; | |
5443e65e | 93 | fPar = NULL; |
16bf9884 | 94 | |
95 | } | |
96 | ||
97 | //_____________________________________________________________________________ | |
73ae7b59 | 98 | AliTRDsimpleMC::AliTRDsimpleMC(const AliTRDsimpleMC &m):TVirtualMC(m) |
16bf9884 | 99 | { |
100 | // | |
101 | // AliTRDsimpleMC copy constructor | |
102 | // | |
103 | ||
104 | ((AliTRDsimpleMC &) m).Copy(*this); | |
105 | ||
106 | } | |
107 | ||
108 | //_____________________________________________________________________________ | |
109 | AliTRDsimpleMC::~AliTRDsimpleMC() | |
110 | { | |
111 | // | |
112 | // AliTRDsimpleMC destructor | |
113 | // | |
114 | ||
115 | } | |
116 | ||
117 | //_____________________________________________________________________________ | |
118 | AliTRDsimpleMC &AliTRDsimpleMC::operator=(const AliTRDsimpleMC &m) | |
119 | { | |
120 | // | |
121 | // Assignment operator | |
122 | // | |
123 | ||
124 | if (this != &m) ((AliTRDsimpleMC &) m).Copy(*this); | |
125 | return *this; | |
126 | ||
127 | } | |
128 | ||
129 | //_____________________________________________________________________________ | |
130 | void AliTRDsimpleMC::Copy(TObject &m) | |
131 | { | |
132 | // | |
133 | // Copy function | |
134 | // | |
135 | ||
136 | ((AliTRDsimpleMC &) m).fMaxStep = fMaxStep; | |
137 | ((AliTRDsimpleMC &) m).fNStep = fNStep; | |
138 | ((AliTRDsimpleMC &) m).fTrack = fTrack; | |
139 | ((AliTRDsimpleMC &) m).fTrackPx = fTrackPx; | |
140 | ((AliTRDsimpleMC &) m).fTrackPy = fTrackPy; | |
141 | ((AliTRDsimpleMC &) m).fTrackPz = fTrackPz; | |
142 | ((AliTRDsimpleMC &) m).fTrackPtot = fTrackPtot; | |
143 | ((AliTRDsimpleMC &) m).fTrackEtot = fTrackEtot; | |
144 | ((AliTRDsimpleMC &) m).fTrackX = fTrackX; | |
145 | ((AliTRDsimpleMC &) m).fTrackY = fTrackY; | |
146 | ((AliTRDsimpleMC &) m).fTrackZ = fTrackZ; | |
147 | ((AliTRDsimpleMC &) m).fTrackStep = fTrackStep; | |
148 | ((AliTRDsimpleMC &) m).fTrackPid = fTrackPid; | |
149 | ((AliTRDsimpleMC &) m).fTrackCharge = fTrackCharge; | |
150 | ((AliTRDsimpleMC &) m).fTrackMass = fTrackMass; | |
151 | ((AliTRDsimpleMC &) m).fTrackEntering = fTrackEntering; | |
152 | ||
153 | } | |
154 | ||
155 | //_____________________________________________________________________________ | |
156 | void AliTRDsimpleMC::NewTrack(Int_t iTrack, Int_t pdg | |
157 | , Double_t px, Double_t py, Double_t pz) | |
158 | { | |
159 | // | |
160 | // Starts a new track. | |
161 | // | |
162 | ||
5443e65e | 163 | if (!fPar) { |
164 | fPar = new AliTRDparameter("TRDparameter","Standard TRD parameter"); | |
165 | } | |
166 | ||
16bf9884 | 167 | if (!fTRD) { |
168 | fTRD = (AliTRDv1 *) gAlice->GetDetector("TRD"); | |
5443e65e | 169 | fX0 = fPar->GetTime0(0) - AliTRDgeometry::DrThick(); |
16bf9884 | 170 | } |
171 | ||
172 | fTRD->ResetHits(); | |
173 | ||
174 | fTrack = iTrack; | |
175 | fMaxStep = 0.0; | |
176 | fNStep = 0; | |
177 | fTrackStep = 0.0; | |
178 | fTrackPid = pdg; | |
179 | fTrackEntering = kTRUE; | |
180 | ||
181 | switch (pdg) { | |
182 | case kPdgElectron: | |
183 | fTrackMass = 5.11e-4; | |
184 | fTrackCharge = -1.0; | |
185 | break; | |
186 | case kPdgPion: | |
187 | fTrackMass = 0.13957; | |
188 | fTrackCharge = 1.0; | |
189 | break; | |
190 | default: | |
191 | printf("<AliTRDsimpleMC::NewTrack> PDG code %d not implemented\n",pdg); | |
192 | break; | |
193 | }; | |
194 | ||
195 | Double_t pTot2 = px*px + py*py + pz*pz; | |
196 | fTrackPtot = TMath::Sqrt(pTot2); | |
197 | fTrackEtot = TMath::Sqrt(pTot2 + fTrackMass*fTrackMass); | |
198 | fTrackPx = px; | |
199 | fTrackPy = py; | |
200 | fTrackPz = pz; | |
201 | ||
202 | fTrackX = fX0; | |
203 | fTrackY = 0.0; | |
204 | fTrackZ = 0.0; | |
205 | ||
5d12ce38 | 206 | gAlice->GetMCApp()->SetCurrentTrack(0); |
16bf9884 | 207 | |
208 | } | |
209 | ||
210 | //_____________________________________________________________________________ | |
211 | void AliTRDsimpleMC::ProcessEvent() | |
212 | { | |
213 | // | |
214 | // Process one single track: | |
215 | // - Determines the step size. | |
216 | // - Calculates the track position | |
217 | // - Calls TRD step manager. | |
218 | // | |
219 | ||
220 | // The stepsize from an exponential distribution | |
221 | fTrackStep = gRandom->Exp(fMaxStep); | |
222 | ||
223 | if ((fTrackEntering) && (fNStep > 0)) { | |
224 | fTrackEntering = kFALSE; | |
225 | } | |
226 | fNStep++; | |
227 | ||
228 | // New track position | |
229 | Double_t d = fTrackStep / fTrackPtot; | |
230 | fTrackX += fTrackPx * d; | |
231 | fTrackY += fTrackPy * d; | |
232 | fTrackZ += fTrackPz * d; | |
233 | ||
234 | // Call the TRD step manager | |
235 | fTRD->StepManager(); | |
236 | ||
237 | } | |
238 | ||
239 | //_____________________________________________________________________________ | |
240 | void AliTRDsimpleMC::TrackPosition(TLorentzVector& position) const | |
241 | { | |
242 | // | |
243 | // Track Position | |
244 | // | |
245 | ||
246 | position[0] = fTrackX; | |
247 | position[1] = fTrackY; | |
248 | position[2] = fTrackZ; | |
249 | ||
250 | } | |
251 | ||
059f00b8 | 252 | //_____________________________________________________________________________ |
253 | void AliTRDsimpleMC::TrackPosition(Double_t &x, Double_t &y, Double_t &z) const | |
254 | { | |
255 | // | |
256 | // Track Position | |
257 | // | |
258 | ||
259 | x = fTrackX; | |
260 | y = fTrackY; | |
261 | z = fTrackZ; | |
262 | ||
263 | } | |
264 | ||
16bf9884 | 265 | //_____________________________________________________________________________ |
266 | void AliTRDsimpleMC::TrackMomentum(TLorentzVector& momentum) const | |
267 | { | |
268 | // | |
269 | // Track Momentum | |
270 | // | |
271 | ||
272 | momentum[0] = fTrackPx; | |
273 | momentum[1] = fTrackPy; | |
274 | momentum[2] = fTrackPz; | |
275 | momentum[3] = fTrackEtot; | |
276 | ||
277 | } | |
278 | ||
059f00b8 | 279 | //_____________________________________________________________________________ |
88cb7938 | 280 | void AliTRDsimpleMC::TrackMomentum(Double_t &px, Double_t &py, |
281 | Double_t &pz, Double_t &et) const | |
059f00b8 | 282 | { |
283 | // | |
284 | // Track Momentum | |
285 | // | |
286 | ||
88cb7938 | 287 | px = fTrackPx; |
288 | py = fTrackPy; | |
289 | pz = fTrackPz; | |
290 | et = fTrackEtot; | |
059f00b8 | 291 | |
292 | } | |
293 | ||
16bf9884 | 294 | //_____________________________________________________________________________ |
295 | Int_t AliTRDsimpleMC::VolId(const Text_t* volName) const | |
296 | { | |
297 | // | |
298 | // Returns the volume IDs: | |
299 | // 1 = drift region | |
300 | // 2 = amplification region | |
301 | // 3 = drift chambers | |
302 | // | |
303 | ||
304 | Int_t volId = -1; | |
305 | ||
ee7e3ede | 306 | if (strcmp(volName,"UJ00") == 0) { |
16bf9884 | 307 | volId = kVolDrRg; |
308 | } | |
ee7e3ede | 309 | else if (strcmp(volName,"UK00") == 0) { |
16bf9884 | 310 | volId = kVolAmRg; |
311 | } | |
ee7e3ede | 312 | else if (strcmp(volName,"UC00") == 0) { |
16bf9884 | 313 | volId = kVolDrCh; |
314 | } | |
315 | ||
316 | return volId; | |
317 | ||
318 | } | |
319 | ||
320 | //_____________________________________________________________________________ | |
321 | Int_t AliTRDsimpleMC::CurrentVolID(Int_t& copyNo) const | |
322 | { | |
323 | // | |
324 | // Check for the current volume | |
325 | // | |
326 | ||
327 | Int_t volId = -1; | |
328 | ||
329 | copyNo = 0; | |
330 | ||
331 | // Drift region | |
332 | if ((fTrackX-fX0) < AliTRDgeometry::DrThick()) { | |
333 | volId = kVolDrRg; | |
334 | } | |
335 | else if ((fTrackX-fX0) < (AliTRDgeometry::DrThick() + | |
336 | AliTRDgeometry::AmThick())) { | |
337 | volId = kVolAmRg; | |
338 | } | |
339 | ||
340 | return volId; | |
341 | ||
342 | } | |
343 | ||
ee7e3ede | 344 | //_____________________________________________________________________________ |
345 | const char *AliTRDsimpleMC::CurrentVolName() const | |
346 | { | |
347 | // | |
348 | // Check for the current volume | |
349 | // | |
350 | ||
8e8eae84 | 351 | const char *volName = "UA00"; |
ee7e3ede | 352 | |
353 | // Drift region | |
354 | if ((fTrackX-fX0) < AliTRDgeometry::DrThick()) { | |
355 | volName = "UJ00"; | |
356 | } | |
357 | else if ((fTrackX-fX0) < (AliTRDgeometry::DrThick() + | |
358 | AliTRDgeometry::AmThick())) { | |
359 | volName = "UK00"; | |
360 | } | |
361 | ||
362 | return volName; | |
363 | ||
364 | } | |
365 | ||
16bf9884 | 366 | //_____________________________________________________________________________ |
73ae7b59 | 367 | Int_t AliTRDsimpleMC::CurrentVolOffID(Int_t , Int_t ©No) const |
16bf9884 | 368 | { |
369 | // | |
370 | // Check for the current volume | |
371 | // | |
372 | ||
373 | copyNo = 1; | |
374 | return kVolDrCh; | |
375 | ||
376 | } |