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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 "AliTRDsimpleMC.h" |
16bf9884 | 31 | #include "AliTRDv1.h" |
5d12ce38 | 32 | #include "AliMC.h" |
7754cd1f | 33 | |
16bf9884 | 34 | ClassImp(AliTRDsimpleMC) |
35 | ||
36 | //_____________________________________________________________________________ | |
4c475d27 | 37 | AliTRDsimpleMC::AliTRDsimpleMC() |
16bf9884 | 38 | { |
39 | // | |
40 | // AliTRDsimpleMC default constructor | |
41 | // | |
42 | ||
43 | fMaxStep = 0.0; | |
44 | fNStep = 0; | |
45 | fTrack = 0; | |
46 | fTrackPx = 0.0; | |
47 | fTrackPy = 0.0; | |
48 | fTrackPz = 0.0; | |
49 | fTrackPtot = 0.0; | |
50 | fTrackEtot = 0.0; | |
51 | fTrackX = 0.0; | |
52 | fTrackY = 0.0; | |
53 | fTrackZ = 0.0; | |
54 | fTrackStep = 0.0; | |
55 | fTrackPid = 0; | |
56 | fTrackCharge = 0.0; | |
57 | fTrackMass = 0.0; | |
58 | fTrackEntering = kFALSE; | |
59 | ||
60 | fTRD = NULL; | |
7754cd1f | 61 | |
62 | } | |
16bf9884 | 63 | |
64 | //_____________________________________________________________________________ | |
65 | AliTRDsimpleMC::AliTRDsimpleMC(const char *name, const char *title) | |
642f15cf | 66 | :TVirtualMC(name,title,kFALSE) |
16bf9884 | 67 | { |
68 | // | |
69 | // AliTRDsimpleMC default constructor | |
70 | // | |
71 | ||
72 | fMaxStep = 0.0; | |
73 | fNStep = 0; | |
74 | fTrack = 0; | |
75 | fTrackPx = 0.0; | |
76 | fTrackPy = 0.0; | |
77 | fTrackPz = 0.0; | |
78 | fTrackPtot = 0.0; | |
79 | fTrackEtot = 0.0; | |
80 | fTrackX = 0.0; | |
81 | fTrackY = 0.0; | |
82 | fTrackZ = 0.0; | |
83 | fTrackStep = 0.0; | |
84 | fTrackPid = 0; | |
85 | fTrackCharge = 0.0; | |
86 | fTrackMass = 0.0; | |
87 | fTrackEntering = kFALSE; | |
88 | ||
89 | fTRD = NULL; | |
7754cd1f | 90 | |
91 | } | |
16bf9884 | 92 | |
93 | //_____________________________________________________________________________ | |
73ae7b59 | 94 | AliTRDsimpleMC::AliTRDsimpleMC(const AliTRDsimpleMC &m):TVirtualMC(m) |
16bf9884 | 95 | { |
96 | // | |
97 | // AliTRDsimpleMC copy constructor | |
98 | // | |
99 | ||
100 | ((AliTRDsimpleMC &) m).Copy(*this); | |
101 | ||
102 | } | |
103 | ||
104 | //_____________________________________________________________________________ | |
105 | AliTRDsimpleMC::~AliTRDsimpleMC() | |
106 | { | |
107 | // | |
108 | // AliTRDsimpleMC destructor | |
109 | // | |
110 | ||
111 | } | |
112 | ||
113 | //_____________________________________________________________________________ | |
114 | AliTRDsimpleMC &AliTRDsimpleMC::operator=(const AliTRDsimpleMC &m) | |
115 | { | |
116 | // | |
117 | // Assignment operator | |
118 | // | |
119 | ||
120 | if (this != &m) ((AliTRDsimpleMC &) m).Copy(*this); | |
121 | return *this; | |
122 | ||
123 | } | |
124 | ||
125 | //_____________________________________________________________________________ | |
e0d47c25 | 126 | void AliTRDsimpleMC::Copy(TObject &m) const |
16bf9884 | 127 | { |
128 | // | |
129 | // Copy function | |
130 | // | |
131 | ||
132 | ((AliTRDsimpleMC &) m).fMaxStep = fMaxStep; | |
133 | ((AliTRDsimpleMC &) m).fNStep = fNStep; | |
134 | ((AliTRDsimpleMC &) m).fTrack = fTrack; | |
135 | ((AliTRDsimpleMC &) m).fTrackPx = fTrackPx; | |
136 | ((AliTRDsimpleMC &) m).fTrackPy = fTrackPy; | |
137 | ((AliTRDsimpleMC &) m).fTrackPz = fTrackPz; | |
138 | ((AliTRDsimpleMC &) m).fTrackPtot = fTrackPtot; | |
139 | ((AliTRDsimpleMC &) m).fTrackEtot = fTrackEtot; | |
140 | ((AliTRDsimpleMC &) m).fTrackX = fTrackX; | |
141 | ((AliTRDsimpleMC &) m).fTrackY = fTrackY; | |
142 | ((AliTRDsimpleMC &) m).fTrackZ = fTrackZ; | |
143 | ((AliTRDsimpleMC &) m).fTrackStep = fTrackStep; | |
144 | ((AliTRDsimpleMC &) m).fTrackPid = fTrackPid; | |
145 | ((AliTRDsimpleMC &) m).fTrackCharge = fTrackCharge; | |
146 | ((AliTRDsimpleMC &) m).fTrackMass = fTrackMass; | |
147 | ((AliTRDsimpleMC &) m).fTrackEntering = fTrackEntering; | |
148 | ||
149 | } | |
150 | ||
151 | //_____________________________________________________________________________ | |
152 | void AliTRDsimpleMC::NewTrack(Int_t iTrack, Int_t pdg | |
153 | , Double_t px, Double_t py, Double_t pz) | |
154 | { | |
155 | // | |
156 | // Starts a new track. | |
157 | // | |
158 | ||
159 | if (!fTRD) { | |
160 | fTRD = (AliTRDv1 *) gAlice->GetDetector("TRD"); | |
7754cd1f | 161 | fX0 = AliTRDgeometry::GetTime0(0) - AliTRDgeometry::DrThick(); |
16bf9884 | 162 | } |
163 | ||
164 | fTRD->ResetHits(); | |
165 | ||
166 | fTrack = iTrack; | |
167 | fMaxStep = 0.0; | |
168 | fNStep = 0; | |
169 | fTrackStep = 0.0; | |
170 | fTrackPid = pdg; | |
171 | fTrackEntering = kTRUE; | |
172 | ||
173 | switch (pdg) { | |
174 | case kPdgElectron: | |
175 | fTrackMass = 5.11e-4; | |
176 | fTrackCharge = -1.0; | |
177 | break; | |
178 | case kPdgPion: | |
179 | fTrackMass = 0.13957; | |
180 | fTrackCharge = 1.0; | |
181 | break; | |
182 | default: | |
183 | printf("<AliTRDsimpleMC::NewTrack> PDG code %d not implemented\n",pdg); | |
184 | break; | |
185 | }; | |
186 | ||
187 | Double_t pTot2 = px*px + py*py + pz*pz; | |
188 | fTrackPtot = TMath::Sqrt(pTot2); | |
189 | fTrackEtot = TMath::Sqrt(pTot2 + fTrackMass*fTrackMass); | |
190 | fTrackPx = px; | |
191 | fTrackPy = py; | |
192 | fTrackPz = pz; | |
193 | ||
194 | fTrackX = fX0; | |
195 | fTrackY = 0.0; | |
196 | fTrackZ = 0.0; | |
197 | ||
5d12ce38 | 198 | gAlice->GetMCApp()->SetCurrentTrack(0); |
16bf9884 | 199 | |
200 | } | |
201 | ||
202 | //_____________________________________________________________________________ | |
203 | void AliTRDsimpleMC::ProcessEvent() | |
204 | { | |
205 | // | |
206 | // Process one single track: | |
207 | // - Determines the step size. | |
208 | // - Calculates the track position | |
209 | // - Calls TRD step manager. | |
210 | // | |
211 | ||
212 | // The stepsize from an exponential distribution | |
213 | fTrackStep = gRandom->Exp(fMaxStep); | |
214 | ||
215 | if ((fTrackEntering) && (fNStep > 0)) { | |
216 | fTrackEntering = kFALSE; | |
217 | } | |
218 | fNStep++; | |
219 | ||
220 | // New track position | |
221 | Double_t d = fTrackStep / fTrackPtot; | |
222 | fTrackX += fTrackPx * d; | |
223 | fTrackY += fTrackPy * d; | |
224 | fTrackZ += fTrackPz * d; | |
225 | ||
226 | // Call the TRD step manager | |
227 | fTRD->StepManager(); | |
228 | ||
229 | } | |
230 | ||
231 | //_____________________________________________________________________________ | |
232 | void AliTRDsimpleMC::TrackPosition(TLorentzVector& position) const | |
233 | { | |
234 | // | |
235 | // Track Position | |
236 | // | |
237 | ||
238 | position[0] = fTrackX; | |
239 | position[1] = fTrackY; | |
240 | position[2] = fTrackZ; | |
241 | ||
242 | } | |
243 | ||
059f00b8 | 244 | //_____________________________________________________________________________ |
245 | void AliTRDsimpleMC::TrackPosition(Double_t &x, Double_t &y, Double_t &z) const | |
246 | { | |
247 | // | |
248 | // Track Position | |
249 | // | |
250 | ||
251 | x = fTrackX; | |
252 | y = fTrackY; | |
253 | z = fTrackZ; | |
254 | ||
255 | } | |
256 | ||
16bf9884 | 257 | //_____________________________________________________________________________ |
258 | void AliTRDsimpleMC::TrackMomentum(TLorentzVector& momentum) const | |
259 | { | |
260 | // | |
261 | // Track Momentum | |
262 | // | |
263 | ||
264 | momentum[0] = fTrackPx; | |
265 | momentum[1] = fTrackPy; | |
266 | momentum[2] = fTrackPz; | |
267 | momentum[3] = fTrackEtot; | |
268 | ||
269 | } | |
270 | ||
059f00b8 | 271 | //_____________________________________________________________________________ |
88cb7938 | 272 | void AliTRDsimpleMC::TrackMomentum(Double_t &px, Double_t &py, |
273 | Double_t &pz, Double_t &et) const | |
059f00b8 | 274 | { |
275 | // | |
276 | // Track Momentum | |
277 | // | |
278 | ||
88cb7938 | 279 | px = fTrackPx; |
280 | py = fTrackPy; | |
281 | pz = fTrackPz; | |
282 | et = fTrackEtot; | |
059f00b8 | 283 | |
284 | } | |
285 | ||
16bf9884 | 286 | //_____________________________________________________________________________ |
287 | Int_t AliTRDsimpleMC::VolId(const Text_t* volName) const | |
288 | { | |
289 | // | |
290 | // Returns the volume IDs: | |
291 | // 1 = drift region | |
292 | // 2 = amplification region | |
293 | // 3 = drift chambers | |
294 | // | |
295 | ||
296 | Int_t volId = -1; | |
297 | ||
ee7e3ede | 298 | if (strcmp(volName,"UJ00") == 0) { |
16bf9884 | 299 | volId = kVolDrRg; |
300 | } | |
ee7e3ede | 301 | else if (strcmp(volName,"UK00") == 0) { |
16bf9884 | 302 | volId = kVolAmRg; |
303 | } | |
ee7e3ede | 304 | else if (strcmp(volName,"UC00") == 0) { |
16bf9884 | 305 | volId = kVolDrCh; |
306 | } | |
307 | ||
308 | return volId; | |
309 | ||
310 | } | |
311 | ||
312 | //_____________________________________________________________________________ | |
313 | Int_t AliTRDsimpleMC::CurrentVolID(Int_t& copyNo) const | |
314 | { | |
315 | // | |
316 | // Check for the current volume | |
317 | // | |
318 | ||
319 | Int_t volId = -1; | |
320 | ||
321 | copyNo = 0; | |
322 | ||
323 | // Drift region | |
324 | if ((fTrackX-fX0) < AliTRDgeometry::DrThick()) { | |
325 | volId = kVolDrRg; | |
326 | } | |
327 | else if ((fTrackX-fX0) < (AliTRDgeometry::DrThick() + | |
328 | AliTRDgeometry::AmThick())) { | |
329 | volId = kVolAmRg; | |
330 | } | |
331 | ||
332 | return volId; | |
333 | ||
334 | } | |
335 | ||
ee7e3ede | 336 | //_____________________________________________________________________________ |
337 | const char *AliTRDsimpleMC::CurrentVolName() const | |
338 | { | |
339 | // | |
340 | // Check for the current volume | |
341 | // | |
342 | ||
8e8eae84 | 343 | const char *volName = "UA00"; |
ee7e3ede | 344 | |
345 | // Drift region | |
346 | if ((fTrackX-fX0) < AliTRDgeometry::DrThick()) { | |
347 | volName = "UJ00"; | |
348 | } | |
349 | else if ((fTrackX-fX0) < (AliTRDgeometry::DrThick() + | |
350 | AliTRDgeometry::AmThick())) { | |
351 | volName = "UK00"; | |
352 | } | |
353 | ||
354 | return volName; | |
355 | ||
356 | } | |
357 | ||
16bf9884 | 358 | //_____________________________________________________________________________ |
73ae7b59 | 359 | Int_t AliTRDsimpleMC::CurrentVolOffID(Int_t , Int_t ©No) const |
16bf9884 | 360 | { |
361 | // | |
362 | // Check for the current volume | |
363 | // | |
364 | ||
365 | copyNo = 1; | |
366 | return kVolDrCh; | |
367 | ||
368 | } |