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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 | #include <TClonesArray.h> | |
25 | ||
26 | AliPrimaryGeneratorAction::AliPrimaryGeneratorAction() | |
27 | : fGenerator(kAliGenerator), | |
28 | fNofGunParticles(1), | |
29 | fVerboseLevel(0), | |
30 | fParticleArray(0) | |
31 | { | |
32 | // | |
33 | fParticleGun = new AliParticleGun(); | |
34 | fMessenger = new AliPrimaryGeneratorMessenger(this); | |
35 | } | |
36 | ||
37 | AliPrimaryGeneratorAction::AliPrimaryGeneratorAction( | |
38 | const AliPrimaryGeneratorAction& right) { | |
39 | // | |
40 | AliGlobals::Exception( | |
41 | "AliPrimaryGeneratorAction is protected from copying."); | |
42 | } | |
43 | ||
44 | AliPrimaryGeneratorAction::~AliPrimaryGeneratorAction() { | |
45 | // | |
46 | delete fMessenger; | |
47 | delete fParticleGun; | |
48 | } | |
49 | ||
50 | // operators | |
51 | ||
52 | AliPrimaryGeneratorAction& | |
53 | AliPrimaryGeneratorAction::operator=(const AliPrimaryGeneratorAction &right) | |
54 | { | |
55 | // check assignement to self | |
56 | if (this == &right) return *this; | |
57 | ||
58 | AliGlobals::Exception( | |
59 | "AliPrimaryGeneratorAction is protected from assigning."); | |
60 | ||
61 | return *this; | |
62 | } | |
63 | ||
64 | // private methods | |
65 | ||
66 | void AliPrimaryGeneratorAction::ConstructGenerator() | |
67 | { | |
68 | // Constructs selected generator. | |
69 | // --- | |
70 | ||
71 | fParticleArray = 0; | |
72 | switch (fGenerator) { | |
73 | case kGun: | |
74 | // gun is constructed interactively | |
75 | return; | |
76 | case kGeantino: | |
77 | ConstructGeantinoGenerator(false); | |
78 | return; | |
79 | case kChargedGeantino: | |
80 | ConstructGeantinoGenerator(true); | |
81 | return; | |
82 | case kAliGenerator: | |
83 | ConstructAliGenerator(); | |
84 | return; | |
85 | } | |
86 | } | |
87 | ||
88 | void AliPrimaryGeneratorAction::ConstructGeantinoGenerator(G4bool isCharged) | |
89 | { | |
90 | // Geantino with random momentum direction | |
91 | // (the default generator). | |
92 | // --- | |
93 | ||
94 | // reset gun | |
95 | fParticleGun->Reset(); | |
96 | ||
97 | G4ParticleTable* particleTable | |
98 | = G4ParticleTable::GetParticleTable(); | |
99 | ||
100 | for (G4int i=0; i< fNofGunParticles; i++) | |
101 | { | |
102 | G4ParticleDefinition* particleDef = 0; | |
103 | if (!isCharged) | |
104 | particleDef = particleTable->FindParticle("geantino"); | |
105 | else | |
106 | particleDef = particleTable->FindParticle("chargedgeantino"); | |
107 | ||
108 | if (!particleDef) { | |
109 | G4String text = "AliPrimaryGeneratorAction::GenerateGeantino:\n"; | |
110 | text = text + " G4ParticleTable::FindParticle() failed."; | |
111 | AliGlobals::Exception(text); | |
112 | } | |
113 | ||
114 | G4double rn[3]; | |
115 | RandFlat::shootArray(3,rn); | |
116 | G4double px=rn[0]; | |
117 | G4double py=rn[1]; | |
118 | G4double pz=rn[2]; | |
119 | G4ThreeVector momentumDir(px, py, pz); | |
120 | ||
121 | G4double energy = 1.*GeV; | |
122 | G4ThreeVector position(0.,0.,0.); | |
123 | G4double time = 0.; | |
124 | G4ThreeVector polarization(0.,0.,0.); | |
125 | ||
126 | AliGunParticle * gunParticle | |
127 | = new AliGunParticle(particleDef, momentumDir, energy, position, time, | |
128 | polarization); | |
129 | ||
130 | fParticleGun->AddParticle(gunParticle); | |
131 | } | |
132 | if (fVerboseLevel>1) { | |
133 | G4cout << "Geantino generator has been built." << G4endl; | |
134 | } | |
135 | } | |
136 | ||
137 | void AliPrimaryGeneratorAction::ConstructAliGenerator() | |
138 | { | |
139 | // Generator from AliRoot | |
140 | // AliGenerator::Generate() fills the AliRun::fParticles array. | |
141 | // --- | |
142 | ||
143 | // check if AliGenerator is set | |
144 | AliGenerator* generator = gAlice->Generator(); | |
145 | if (!generator) { | |
146 | G4String text = "AliPrimaryGeneratorAction::ConstructGenerator:\n"; | |
147 | text = text + " No AliGenerator is defined in gAlice."; | |
148 | AliGlobals::Exception(text); | |
149 | } | |
150 | // fill AliRun::fParticles array | |
151 | generator->Generate(); | |
152 | fParticleArray = gAlice->Particles(); | |
153 | } | |
154 | ||
155 | void AliPrimaryGeneratorAction::GenerateAliGeneratorPrimaries(G4Event* event) | |
156 | { | |
157 | // Creates a new G4PrimaryVertex objects for each TParticle | |
158 | // in fParticles array. | |
159 | // --- | |
160 | ||
161 | G4PrimaryVertex* previousVertex = 0; | |
162 | G4ThreeVector previousPosition = G4ThreeVector(); | |
163 | G4double previousTime = 0.; | |
164 | ||
165 | G4int nofParticles = gAlice->GetNtrack(); | |
166 | // add verbose | |
167 | //G4cout << " nofParticles: " << nofParticles << G4endl; | |
168 | for( G4int i=0; i<nofParticles; i++ ) { | |
169 | ||
170 | // get particle from TClonesArray | |
171 | TObject* particleTObject | |
172 | = fParticleArray->UncheckedAt(i); | |
173 | TParticle* particle | |
174 | = dynamic_cast<TParticle*>(particleTObject); | |
175 | ||
176 | // check particle type | |
177 | if (!particle) { | |
178 | G4String text = | |
179 | "AliPrimaryGeneratorAction::GenerateAliGeneratorPrimaries\n"; | |
180 | text = text + "Unknown particle type"; | |
181 | AliGlobals::Exception(text); | |
182 | } | |
183 | ||
184 | // get particle definition from G4ParticleTable | |
185 | G4int pdgEncoding = particle->GetPdgCode(); | |
186 | G4ParticleTable* particleTable | |
187 | = G4ParticleTable::GetParticleTable(); | |
188 | G4ParticleDefinition* particleDefinition = 0; | |
189 | if (pdgEncoding != 0) | |
190 | particleDefinition = particleTable->FindParticle(pdgEncoding); | |
191 | else { | |
192 | G4String name = particle->GetName(); | |
193 | if (name == "Rootino") | |
194 | particleDefinition = particleTable->FindParticle("geantino"); | |
195 | } | |
196 | ||
197 | if (particleDefinition==0) { | |
198 | G4cout << "pdgEncoding: " << pdgEncoding << G4endl; | |
199 | G4String text = | |
200 | "AliPrimaryGeneratorAction::GenerateAliGeneratorPrimaries:\n"; | |
201 | text = text + " G4ParticleTable::FindParticle() failed."; | |
202 | AliGlobals::Exception(text); | |
203 | } | |
204 | ||
205 | // get/create vertex | |
206 | G4ThreeVector position | |
207 | = G4ThreeVector(particle->Vx()*TG3Units::Length(), | |
208 | particle->Vy()*TG3Units::Length(), | |
209 | particle->Vz()*TG3Units::Length()); | |
210 | G4double time = particle->T()*TG3Units::Time(); | |
211 | G4PrimaryVertex* vertex; | |
212 | if ( i==0 || position != previousPosition || time != previousTime ) { | |
213 | // create a new vertex | |
214 | // in case position and time of gun particle are different from | |
215 | // previous values | |
216 | // (vertex objects are destroyed in G4EventManager::ProcessOneEvent() | |
217 | // when event is deleted) | |
218 | vertex = new G4PrimaryVertex(position, time); | |
219 | event->AddPrimaryVertex(vertex); | |
220 | ||
221 | previousVertex = vertex; | |
222 | previousPosition = position; | |
223 | previousTime = time; | |
224 | } | |
225 | else | |
226 | vertex = previousVertex; | |
227 | ||
228 | // create a primary particle and add it to the vertex | |
229 | // (primaryParticle objects are destroyed in G4EventManager::ProcessOneEvent() | |
230 | // when event and then vertex is deleted) | |
231 | G4double px = particle->Px()*TG3Units::Energy(); | |
232 | G4double py = particle->Py()*TG3Units::Energy(); | |
233 | G4double pz = particle->Pz()*TG3Units::Energy(); | |
234 | G4PrimaryParticle* primaryParticle | |
235 | = new G4PrimaryParticle(particleDefinition, px, py, pz); | |
236 | ||
237 | // set polarization | |
238 | TVector3 polarization; | |
239 | particle->GetPolarisation(polarization); | |
240 | primaryParticle | |
241 | ->SetPolarization(polarization.X(), polarization.Y(), polarization.Z()); | |
242 | ||
243 | // add primary particle to the vertex | |
244 | vertex->SetPrimary(primaryParticle); | |
245 | } | |
246 | } | |
247 | ||
248 | // public methods | |
249 | ||
250 | void AliPrimaryGeneratorAction::GeneratePrimaries(G4Event* event) | |
251 | { | |
252 | // Generates primary particles by the selected generator. | |
253 | // --- | |
254 | ||
255 | // reset AliRun | |
256 | gAlice->BeginEvent(); | |
257 | ||
258 | // fill particle gun/particle array | |
259 | ConstructGenerator(); | |
260 | ||
261 | // generate primary vertices | |
262 | if (fParticleArray) { | |
263 | // use AliGenerator if set | |
264 | GenerateAliGeneratorPrimaries(event); | |
265 | ||
266 | // do not save primary particles | |
267 | // (they would be stored twice) | |
268 | AliTrackingAction* trackingAction | |
269 | = AliTrackingAction::Instance(); | |
270 | trackingAction->SetSavePrimaries(false); | |
271 | } | |
272 | else { | |
273 | // use particle gun otherwise | |
274 | fParticleGun->GeneratePrimaryVertex(event); | |
275 | ||
276 | // primary particles have to be saved | |
277 | AliTrackingAction* trackingAction | |
278 | = AliTrackingAction::Instance(); | |
279 | trackingAction->SetSavePrimaries(true); | |
280 | } | |
281 | } | |
282 | ||
283 | void AliPrimaryGeneratorAction::SetGenerator(AliPrimaryGenerator generator) | |
284 | { | |
285 | // Sets generator. | |
286 | // --- | |
287 | ||
288 | fGenerator = generator; | |
289 | } | |
290 | ||
291 | void AliPrimaryGeneratorAction::SetNofGunParticles(G4int nofParticles) | |
292 | { | |
293 | // Sets number of primary particles. | |
294 | // This method is applied only to "gun" type generators | |
295 | // (and not to AliGenerator from AliRoot). | |
296 | // --- | |
297 | ||
298 | fNofGunParticles = nofParticles; | |
299 | } | |
300 | ||
301 | ||
302 | ||
303 | ||
304 | ||
305 |