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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 | ||
16 | /* | |
5443e65e | 17 | $Log$ |
059f00b8 | 18 | Revision 1.4 2002/11/21 22:38:47 alibrary |
19 | Removing AliMC and AliMCProcess | |
20 | ||
4c475d27 | 21 | Revision 1.3 2002/10/14 14:57:44 hristov |
22 | Merging the VirtualMC branch to the main development branch (HEAD) | |
23 | ||
b9d0a01d | 24 | Revision 1.1.8.1 2002/07/24 10:09:31 alibrary |
25 | Updating VirtualMC | |
26 | ||
27 | Revision 1.2 2002/06/12 09:54:35 cblume | |
28 | Update of tracking code provided by Sergei | |
29 | ||
5443e65e | 30 | Revision 1.1 2001/11/06 17:19:41 cblume |
31 | Add detailed geometry and simple simulator | |
32 | ||
16bf9884 | 33 | */ |
34 | ||
35 | /////////////////////////////////////////////////////////////////////////////// | |
36 | // // | |
37 | // Simple TRD Monte Carlo class // | |
38 | // // | |
39 | /////////////////////////////////////////////////////////////////////////////// | |
40 | ||
41 | #include <stdlib.h> | |
42 | ||
43 | #include <TLorentzVector.h> | |
44 | ||
45 | #include "AliRun.h" | |
46 | ||
47 | #include "AliTRDsimpleMC.h" | |
48 | #include "AliTRDgeometry.h" | |
49 | #include "AliTRDv1.h" | |
5443e65e | 50 | #include "AliTRDparameter.h" |
16bf9884 | 51 | |
52 | ClassImp(AliTRDsimpleMC) | |
53 | ||
54 | //_____________________________________________________________________________ | |
4c475d27 | 55 | AliTRDsimpleMC::AliTRDsimpleMC() |
16bf9884 | 56 | { |
57 | // | |
58 | // AliTRDsimpleMC default constructor | |
59 | // | |
60 | ||
61 | fMaxStep = 0.0; | |
62 | fNStep = 0; | |
63 | fTrack = 0; | |
64 | fTrackPx = 0.0; | |
65 | fTrackPy = 0.0; | |
66 | fTrackPz = 0.0; | |
67 | fTrackPtot = 0.0; | |
68 | fTrackEtot = 0.0; | |
69 | fTrackX = 0.0; | |
70 | fTrackY = 0.0; | |
71 | fTrackZ = 0.0; | |
72 | fTrackStep = 0.0; | |
73 | fTrackPid = 0; | |
74 | fTrackCharge = 0.0; | |
75 | fTrackMass = 0.0; | |
76 | fTrackEntering = kFALSE; | |
77 | ||
78 | fTRD = NULL; | |
5443e65e | 79 | fPar = NULL; |
16bf9884 | 80 | |
81 | } | |
82 | ||
83 | //_____________________________________________________________________________ | |
84 | AliTRDsimpleMC::AliTRDsimpleMC(const char *name, const char *title) | |
4c475d27 | 85 | :TVirtualMC(name,title) |
16bf9884 | 86 | { |
87 | // | |
88 | // AliTRDsimpleMC default constructor | |
89 | // | |
90 | ||
91 | fMaxStep = 0.0; | |
92 | fNStep = 0; | |
93 | fTrack = 0; | |
94 | fTrackPx = 0.0; | |
95 | fTrackPy = 0.0; | |
96 | fTrackPz = 0.0; | |
97 | fTrackPtot = 0.0; | |
98 | fTrackEtot = 0.0; | |
99 | fTrackX = 0.0; | |
100 | fTrackY = 0.0; | |
101 | fTrackZ = 0.0; | |
102 | fTrackStep = 0.0; | |
103 | fTrackPid = 0; | |
104 | fTrackCharge = 0.0; | |
105 | fTrackMass = 0.0; | |
106 | fTrackEntering = kFALSE; | |
107 | ||
108 | fTRD = NULL; | |
5443e65e | 109 | fPar = NULL; |
16bf9884 | 110 | |
111 | } | |
112 | ||
113 | //_____________________________________________________________________________ | |
114 | AliTRDsimpleMC::AliTRDsimpleMC(const AliTRDsimpleMC &m) | |
115 | { | |
116 | // | |
117 | // AliTRDsimpleMC copy constructor | |
118 | // | |
119 | ||
120 | ((AliTRDsimpleMC &) m).Copy(*this); | |
121 | ||
122 | } | |
123 | ||
124 | //_____________________________________________________________________________ | |
125 | AliTRDsimpleMC::~AliTRDsimpleMC() | |
126 | { | |
127 | // | |
128 | // AliTRDsimpleMC destructor | |
129 | // | |
130 | ||
131 | } | |
132 | ||
133 | //_____________________________________________________________________________ | |
134 | AliTRDsimpleMC &AliTRDsimpleMC::operator=(const AliTRDsimpleMC &m) | |
135 | { | |
136 | // | |
137 | // Assignment operator | |
138 | // | |
139 | ||
140 | if (this != &m) ((AliTRDsimpleMC &) m).Copy(*this); | |
141 | return *this; | |
142 | ||
143 | } | |
144 | ||
145 | //_____________________________________________________________________________ | |
146 | void AliTRDsimpleMC::Copy(TObject &m) | |
147 | { | |
148 | // | |
149 | // Copy function | |
150 | // | |
151 | ||
152 | ((AliTRDsimpleMC &) m).fMaxStep = fMaxStep; | |
153 | ((AliTRDsimpleMC &) m).fNStep = fNStep; | |
154 | ((AliTRDsimpleMC &) m).fTrack = fTrack; | |
155 | ((AliTRDsimpleMC &) m).fTrackPx = fTrackPx; | |
156 | ((AliTRDsimpleMC &) m).fTrackPy = fTrackPy; | |
157 | ((AliTRDsimpleMC &) m).fTrackPz = fTrackPz; | |
158 | ((AliTRDsimpleMC &) m).fTrackPtot = fTrackPtot; | |
159 | ((AliTRDsimpleMC &) m).fTrackEtot = fTrackEtot; | |
160 | ((AliTRDsimpleMC &) m).fTrackX = fTrackX; | |
161 | ((AliTRDsimpleMC &) m).fTrackY = fTrackY; | |
162 | ((AliTRDsimpleMC &) m).fTrackZ = fTrackZ; | |
163 | ((AliTRDsimpleMC &) m).fTrackStep = fTrackStep; | |
164 | ((AliTRDsimpleMC &) m).fTrackPid = fTrackPid; | |
165 | ((AliTRDsimpleMC &) m).fTrackCharge = fTrackCharge; | |
166 | ((AliTRDsimpleMC &) m).fTrackMass = fTrackMass; | |
167 | ((AliTRDsimpleMC &) m).fTrackEntering = fTrackEntering; | |
168 | ||
169 | } | |
170 | ||
171 | //_____________________________________________________________________________ | |
172 | void AliTRDsimpleMC::NewTrack(Int_t iTrack, Int_t pdg | |
173 | , Double_t px, Double_t py, Double_t pz) | |
174 | { | |
175 | // | |
176 | // Starts a new track. | |
177 | // | |
178 | ||
5443e65e | 179 | if (!fPar) { |
180 | fPar = new AliTRDparameter("TRDparameter","Standard TRD parameter"); | |
181 | } | |
182 | ||
16bf9884 | 183 | if (!fTRD) { |
184 | fTRD = (AliTRDv1 *) gAlice->GetDetector("TRD"); | |
5443e65e | 185 | fX0 = fPar->GetTime0(0) - AliTRDgeometry::DrThick(); |
16bf9884 | 186 | } |
187 | ||
188 | fTRD->ResetHits(); | |
189 | ||
190 | fTrack = iTrack; | |
191 | fMaxStep = 0.0; | |
192 | fNStep = 0; | |
193 | fTrackStep = 0.0; | |
194 | fTrackPid = pdg; | |
195 | fTrackEntering = kTRUE; | |
196 | ||
197 | switch (pdg) { | |
198 | case kPdgElectron: | |
199 | fTrackMass = 5.11e-4; | |
200 | fTrackCharge = -1.0; | |
201 | break; | |
202 | case kPdgPion: | |
203 | fTrackMass = 0.13957; | |
204 | fTrackCharge = 1.0; | |
205 | break; | |
206 | default: | |
207 | printf("<AliTRDsimpleMC::NewTrack> PDG code %d not implemented\n",pdg); | |
208 | break; | |
209 | }; | |
210 | ||
211 | Double_t pTot2 = px*px + py*py + pz*pz; | |
212 | fTrackPtot = TMath::Sqrt(pTot2); | |
213 | fTrackEtot = TMath::Sqrt(pTot2 + fTrackMass*fTrackMass); | |
214 | fTrackPx = px; | |
215 | fTrackPy = py; | |
216 | fTrackPz = pz; | |
217 | ||
218 | fTrackX = fX0; | |
219 | fTrackY = 0.0; | |
220 | fTrackZ = 0.0; | |
221 | ||
222 | gAlice->SetCurrentTrack(-1); | |
223 | ||
224 | } | |
225 | ||
226 | //_____________________________________________________________________________ | |
227 | void AliTRDsimpleMC::ProcessEvent() | |
228 | { | |
229 | // | |
230 | // Process one single track: | |
231 | // - Determines the step size. | |
232 | // - Calculates the track position | |
233 | // - Calls TRD step manager. | |
234 | // | |
235 | ||
236 | // The stepsize from an exponential distribution | |
237 | fTrackStep = gRandom->Exp(fMaxStep); | |
238 | ||
239 | if ((fTrackEntering) && (fNStep > 0)) { | |
240 | fTrackEntering = kFALSE; | |
241 | } | |
242 | fNStep++; | |
243 | ||
244 | // New track position | |
245 | Double_t d = fTrackStep / fTrackPtot; | |
246 | fTrackX += fTrackPx * d; | |
247 | fTrackY += fTrackPy * d; | |
248 | fTrackZ += fTrackPz * d; | |
249 | ||
250 | // Call the TRD step manager | |
251 | fTRD->StepManager(); | |
252 | ||
253 | } | |
254 | ||
255 | //_____________________________________________________________________________ | |
256 | void AliTRDsimpleMC::TrackPosition(TLorentzVector& position) const | |
257 | { | |
258 | // | |
259 | // Track Position | |
260 | // | |
261 | ||
262 | position[0] = fTrackX; | |
263 | position[1] = fTrackY; | |
264 | position[2] = fTrackZ; | |
265 | ||
266 | } | |
267 | ||
059f00b8 | 268 | //_____________________________________________________________________________ |
269 | void AliTRDsimpleMC::TrackPosition(Double_t &x, Double_t &y, Double_t &z) const | |
270 | { | |
271 | // | |
272 | // Track Position | |
273 | // | |
274 | ||
275 | x = fTrackX; | |
276 | y = fTrackY; | |
277 | z = fTrackZ; | |
278 | ||
279 | } | |
280 | ||
16bf9884 | 281 | //_____________________________________________________________________________ |
282 | void AliTRDsimpleMC::TrackMomentum(TLorentzVector& momentum) const | |
283 | { | |
284 | // | |
285 | // Track Momentum | |
286 | // | |
287 | ||
288 | momentum[0] = fTrackPx; | |
289 | momentum[1] = fTrackPy; | |
290 | momentum[2] = fTrackPz; | |
291 | momentum[3] = fTrackEtot; | |
292 | ||
293 | } | |
294 | ||
059f00b8 | 295 | //_____________________________________________________________________________ |
296 | void AliTRDsimpleMC::TrackMomentum(Double_t &px, Double_t &py, Double_t &pz, Double_t &etot) const | |
297 | { | |
298 | // | |
299 | // Track Momentum | |
300 | // | |
301 | ||
302 | px = fTrackPx; | |
303 | py = fTrackPy; | |
304 | pz = fTrackPz; | |
305 | etot = fTrackEtot; | |
306 | ||
307 | } | |
308 | ||
16bf9884 | 309 | //_____________________________________________________________________________ |
310 | Int_t AliTRDsimpleMC::VolId(const Text_t* volName) const | |
311 | { | |
312 | // | |
313 | // Returns the volume IDs: | |
314 | // 1 = drift region | |
315 | // 2 = amplification region | |
316 | // 3 = drift chambers | |
317 | // | |
318 | ||
319 | Int_t volId = -1; | |
320 | ||
321 | if (strcmp(volName,"UL05") == 0) { | |
322 | volId = kVolDrRg; | |
323 | } | |
324 | else if (strcmp(volName,"UL06") == 0) { | |
325 | volId = kVolAmRg; | |
326 | } | |
327 | else if (strcmp(volName,"UCII") == 0) { | |
328 | volId = kVolDrCh; | |
329 | } | |
330 | ||
331 | return volId; | |
332 | ||
333 | } | |
334 | ||
335 | //_____________________________________________________________________________ | |
336 | Int_t AliTRDsimpleMC::CurrentVolID(Int_t& copyNo) const | |
337 | { | |
338 | // | |
339 | // Check for the current volume | |
340 | // | |
341 | ||
342 | Int_t volId = -1; | |
343 | ||
344 | copyNo = 0; | |
345 | ||
346 | // Drift region | |
347 | if ((fTrackX-fX0) < AliTRDgeometry::DrThick()) { | |
348 | volId = kVolDrRg; | |
349 | } | |
350 | else if ((fTrackX-fX0) < (AliTRDgeometry::DrThick() + | |
351 | AliTRDgeometry::AmThick())) { | |
352 | volId = kVolAmRg; | |
353 | } | |
354 | ||
355 | return volId; | |
356 | ||
357 | } | |
358 | ||
359 | //_____________________________________________________________________________ | |
360 | Int_t AliTRDsimpleMC::CurrentVolOffID(Int_t off, Int_t ©No) const | |
361 | { | |
362 | // | |
363 | // Check for the current volume | |
364 | // | |
365 | ||
366 | copyNo = 1; | |
367 | return kVolDrCh; | |
368 | ||
369 | } |