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676fb573 | 1 | // $Id$ |
2 | // Category: run | |
3 | // | |
4 | // See the class description in the header file. | |
5 | ||
6 | #include "AliPrimaryGeneratorAction.h" | |
7 | #include "AliPrimaryGeneratorMessenger.h" | |
8 | #include "AliTrackingAction.h" | |
9 | #include "AliParticleGun.h" | |
10 | #include "AliGunParticle.h" | |
11 | #include "AliGlobals.h" | |
12 | #include "AliRun.h" | |
13 | #include "AliGenerator.h" | |
14 | ||
15 | #include "TG3Units.h" | |
16 | ||
17 | #include <G4Event.hh> | |
18 | #include <G4ParticleTable.hh> | |
19 | #include <G4ParticleDefinition.hh> | |
20 | ||
21 | #include <Randomize.hh> | |
22 | ||
23 | #include <TParticle.h> | |
24 | ||
25 | AliPrimaryGeneratorAction::AliPrimaryGeneratorAction() | |
26 | : fGenerator(kAliGenerator), | |
27 | fNofGunParticles(1), | |
28 | fVerboseLevel(0), | |
29 | fParticleArray(0) | |
30 | { | |
31 | // | |
32 | fParticleGun = new AliParticleGun(); | |
33 | fMessenger = new AliPrimaryGeneratorMessenger(this); | |
34 | } | |
35 | ||
36 | AliPrimaryGeneratorAction::AliPrimaryGeneratorAction( | |
37 | const AliPrimaryGeneratorAction& right) { | |
38 | // | |
39 | AliGlobals::Exception( | |
40 | "AliPrimaryGeneratorAction is protected from copying."); | |
41 | } | |
42 | ||
43 | AliPrimaryGeneratorAction::~AliPrimaryGeneratorAction() { | |
44 | // | |
45 | delete fMessenger; | |
46 | delete fParticleGun; | |
47 | } | |
48 | ||
49 | // operators | |
50 | ||
51 | AliPrimaryGeneratorAction& | |
52 | AliPrimaryGeneratorAction::operator=(const AliPrimaryGeneratorAction &right) | |
53 | { | |
54 | // check assignement to self | |
55 | if (this == &right) return *this; | |
56 | ||
57 | AliGlobals::Exception( | |
58 | "AliPrimaryGeneratorAction is protected from assigning."); | |
59 | ||
60 | return *this; | |
61 | } | |
62 | ||
63 | // private methods | |
64 | ||
65 | void AliPrimaryGeneratorAction::ConstructGenerator() | |
66 | { | |
67 | // Constructs selected generator. | |
68 | // --- | |
69 | ||
70 | fParticleArray = 0; | |
71 | switch (fGenerator) { | |
72 | case kGun: | |
73 | // gun is constructed interactively | |
74 | return; | |
75 | case kGeantino: | |
76 | ConstructGeantinoGenerator(false); | |
77 | return; | |
78 | case kChargedGeantino: | |
79 | ConstructGeantinoGenerator(true); | |
80 | return; | |
81 | case kAliGenerator: | |
82 | ConstructAliGenerator(); | |
83 | return; | |
84 | } | |
85 | } | |
86 | ||
87 | void AliPrimaryGeneratorAction::ConstructGeantinoGenerator(G4bool isCharged) | |
88 | { | |
89 | // Geantino with random momentum direction | |
90 | // (the default generator). | |
91 | // --- | |
92 | ||
93 | // reset gun | |
94 | fParticleGun->Reset(); | |
95 | ||
96 | G4ParticleTable* particleTable | |
97 | = G4ParticleTable::GetParticleTable(); | |
98 | ||
99 | for (G4int i=0; i< fNofGunParticles; i++) | |
100 | { | |
101 | G4ParticleDefinition* particleDef = 0; | |
102 | if (!isCharged) | |
103 | particleDef = particleTable->FindParticle("geantino"); | |
104 | else | |
105 | particleDef = particleTable->FindParticle("chargedgeantino"); | |
106 | ||
107 | if (!particleDef) { | |
108 | G4String text = "AliPrimaryGeneratorAction::GenerateGeantino:\n"; | |
109 | text = text + " G4ParticleTable::FindParticle() failed."; | |
110 | AliGlobals::Exception(text); | |
111 | } | |
112 | ||
113 | G4double rn[3]; | |
114 | RandFlat::shootArray(3,rn); | |
115 | G4double px=rn[0]; | |
116 | G4double py=rn[1]; | |
117 | G4double pz=rn[2]; | |
118 | G4ThreeVector momentumDir(px, py, pz); | |
119 | ||
120 | G4double energy = 1.*GeV; | |
121 | G4ThreeVector position(0.,0.,0.); | |
122 | G4double time = 0.; | |
123 | G4ThreeVector polarization(0.,0.,0.); | |
124 | ||
125 | AliGunParticle * gunParticle | |
126 | = new AliGunParticle(particleDef, momentumDir, energy, position, time, | |
127 | polarization); | |
128 | ||
129 | fParticleGun->AddParticle(gunParticle); | |
130 | } | |
131 | if (fVerboseLevel>1) { | |
132 | G4cout << "Geantino generator has been built." << endl; | |
133 | } | |
134 | } | |
135 | ||
136 | void AliPrimaryGeneratorAction::ConstructAliGenerator() | |
137 | { | |
138 | // Generator from AliRoot | |
139 | // AliGenerator::Generate() fills the AliRun::fParticles array. | |
140 | // --- | |
141 | ||
142 | // check if AliGenerator is set | |
143 | AliGenerator* generator = gAlice->Generator(); | |
144 | if (!generator) { | |
145 | G4String text = "AliPrimaryGeneratorAction::ConstructGenerator:\n"; | |
146 | text = text + " No AliGenerator is defined in gAlice."; | |
147 | AliGlobals::Exception(text); | |
148 | } | |
149 | // fill AliRun::fParticles array | |
150 | generator->Generate(); | |
151 | fParticleArray = gAlice->Particles(); | |
152 | } | |
153 | ||
154 | void AliPrimaryGeneratorAction::GenerateAliGeneratorPrimaries(G4Event* event) | |
155 | { | |
156 | // Creates a new G4PrimaryVertex objects for each TParticle | |
157 | // in fParticles array. | |
158 | // --- | |
159 | ||
160 | G4PrimaryVertex* previousVertex = 0; | |
161 | G4ThreeVector previousPosition = G4ThreeVector(); | |
162 | G4double previousTime = 0.; | |
163 | ||
164 | G4int nofParticles = gAlice->GetNtrack(); | |
165 | // add verbose | |
166 | //G4cout << " nofParticles: " << nofParticles << endl; | |
167 | for( G4int i=0; i<nofParticles; i++ ) { | |
168 | ||
169 | // get particle from TClonesArray | |
170 | TObject* particleTObject | |
171 | = fParticleArray->UncheckedAt(i); | |
172 | TParticle* particle | |
173 | = dynamic_cast<TParticle*>(particleTObject); | |
174 | ||
175 | // check particle type | |
176 | if (!particle) { | |
177 | G4String text = | |
178 | "AliPrimaryGeneratorAction::GenerateAliGeneratorPrimaries\n"; | |
179 | text = text + "Unknown particle type"; | |
180 | AliGlobals::Exception(text); | |
181 | } | |
182 | ||
183 | // get particle definition from G4ParticleTable | |
184 | G4int pdgEncoding = particle->GetPdgCode(); | |
185 | G4ParticleTable* particleTable | |
186 | = G4ParticleTable::GetParticleTable(); | |
187 | G4ParticleDefinition* particleDefinition = 0; | |
188 | if (pdgEncoding != 0) | |
189 | particleDefinition = particleTable->FindParticle(pdgEncoding); | |
190 | else { | |
191 | G4String name = particle->GetName(); | |
192 | if (name == "Rootino") | |
193 | particleDefinition = particleTable->FindParticle("geantino"); | |
194 | } | |
195 | ||
196 | if (particleDefinition==0) { | |
197 | G4cout << "pdgEncoding: " << pdgEncoding << endl; | |
198 | G4String text = | |
199 | "AliPrimaryGeneratorAction::GenerateAliGeneratorPrimaries:\n"; | |
200 | text = text + " G4ParticleTable::FindParticle() failed."; | |
201 | AliGlobals::Exception(text); | |
202 | } | |
203 | ||
204 | // get/create vertex | |
205 | G4ThreeVector position | |
206 | = G4ThreeVector(particle->Vx()*TG3Units::Length(), | |
207 | particle->Vy()*TG3Units::Length(), | |
208 | particle->Vz()*TG3Units::Length()); | |
209 | G4double time = particle->T()*TG3Units::Time(); | |
210 | G4PrimaryVertex* vertex; | |
211 | if ( i==0 || position != previousPosition || time != previousTime ) { | |
212 | // create a new vertex | |
213 | // in case position and time of gun particle are different from | |
214 | // previous values | |
215 | // (vertex objects are destroyed in G4EventManager::ProcessOneEvent() | |
216 | // when event is deleted) | |
217 | vertex = new G4PrimaryVertex(position, time); | |
218 | event->AddPrimaryVertex(vertex); | |
219 | ||
220 | previousVertex = vertex; | |
221 | previousPosition = position; | |
222 | previousTime = time; | |
223 | } | |
224 | else | |
225 | vertex = previousVertex; | |
226 | ||
227 | // create a primary particle and add it to the vertex | |
228 | // (primaryParticle objects are destroyed in G4EventManager::ProcessOneEvent() | |
229 | // when event and then vertex is deleted) | |
230 | G4double px = particle->Px()*TG3Units::Energy(); | |
231 | G4double py = particle->Py()*TG3Units::Energy(); | |
232 | G4double pz = particle->Pz()*TG3Units::Energy(); | |
233 | G4PrimaryParticle* primaryParticle | |
234 | = new G4PrimaryParticle(particleDefinition, px, py, pz); | |
235 | ||
236 | // set polarization | |
237 | TVector3 polarization; | |
238 | particle->GetPolarisation(polarization); | |
239 | primaryParticle | |
240 | ->SetPolarization(polarization.X(), polarization.Y(), polarization.Z()); | |
241 | ||
242 | // add primary particle to the vertex | |
243 | vertex->SetPrimary(primaryParticle); | |
244 | } | |
245 | } | |
246 | ||
247 | // public methods | |
248 | ||
249 | void AliPrimaryGeneratorAction::GeneratePrimaries(G4Event* event) | |
250 | { | |
251 | // Generates primary particles by the selected generator. | |
252 | // --- | |
253 | ||
254 | // reset AliRun | |
255 | gAlice->BeginEvent(); | |
256 | ||
257 | // fill particle gun/particle array | |
258 | ConstructGenerator(); | |
259 | ||
260 | // generate primary vertices | |
261 | if (fParticleArray) { | |
262 | // use AliGenerator if set | |
263 | GenerateAliGeneratorPrimaries(event); | |
264 | ||
265 | // do not save primary particles | |
266 | // (they would be stored twice) | |
267 | AliTrackingAction* trackingAction | |
268 | = AliTrackingAction::Instance(); | |
269 | trackingAction->SetSavePrimaries(false); | |
270 | } | |
271 | else { | |
272 | // use particle gun otherwise | |
273 | fParticleGun->GeneratePrimaryVertex(event); | |
274 | ||
275 | // primary particles have to be saved | |
276 | AliTrackingAction* trackingAction | |
277 | = AliTrackingAction::Instance(); | |
278 | trackingAction->SetSavePrimaries(true); | |
279 | } | |
280 | } | |
281 | ||
282 | void AliPrimaryGeneratorAction::SetGenerator(AliPrimaryGenerator generator) | |
283 | { | |
284 | // Sets generator. | |
285 | // --- | |
286 | ||
287 | fGenerator = generator; | |
288 | } | |
289 | ||
290 | void AliPrimaryGeneratorAction::SetNofGunParticles(G4int nofParticles) | |
291 | { | |
292 | // Sets number of primary particles. | |
293 | // This method is applied only to "gun" type generators | |
294 | // (and not to AliGenerator from AliRoot). | |
295 | // --- | |
296 | ||
297 | fNofGunParticles = nofParticles; | |
298 | } | |
299 | ||
300 | ||
301 | ||
302 | ||
303 | ||
304 |