source: trunk/examples/advanced/gammaray_telescope/src/GammaRayTelPrimaryGeneratorAction.cc@ 1279

Last change on this file since 1279 was 1230, checked in by garnier, 16 years ago

update to geant4.9.3
File size: 7.4 KB
Line 
1//
2// ********************************************************************
3// * License and Disclaimer *
4// * *
5// * The Geant4 software is copyright of the Copyright Holders of *
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14// * regarding this software system or assume any liability for its *
15// * use. Please see the license in the file LICENSE and URL above *
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17// * *
18// * This code implementation is the result of the scientific and *
19// * technical work of the GEANT4 collaboration. *
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25//
26//
27// $Id: GammaRayTelPrimaryGeneratorAction.cc,v 1.11 2007/11/09 16:33:34 flongo Exp $
28// GEANT4 tag $Name: geant4-09-03-cand-01 $
29// ------------------------------------------------------------
30// GEANT 4 class implementation file
31// CERN Geneva Switzerland
32//
33//
34// ------------ GammaRayTelPrimaryGeneratorAction ------
35// by G.Santin, F.Longo & R.Giannitrapani (13 nov 2000)
36//
37// ************************************************************
38
39//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
40//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
41
42#include "G4RunManager.hh"
43#include "GammaRayTelPrimaryGeneratorAction.hh"
44
45#include "GammaRayTelDetectorConstruction.hh"
46#include "GammaRayTelPrimaryGeneratorMessenger.hh"
47
48#include "G4Event.hh"
49#include "G4ParticleGun.hh"
50#include "G4GeneralParticleSource.hh"
51#include "G4ParticleTable.hh"
52#include "G4ParticleDefinition.hh"
53#include "Randomize.hh"
54
55//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
56
57GammaRayTelPrimaryGeneratorAction::GammaRayTelPrimaryGeneratorAction()
58 :rndmFlag("off"),nSourceType(0),nSpectrumType(0)
59{
60 G4RunManager* runManager = G4RunManager::GetRunManager();
61 GammaRayTelDetector =
62 (GammaRayTelDetectorConstruction*)(runManager->GetUserDetectorConstruction());
63
64
65 //create a messenger for this class
66
67 gunMessenger = new GammaRayTelPrimaryGeneratorMessenger(this);
68
69 G4int n_particle = 1;
70
71 particleGun = new G4ParticleGun(n_particle);
72 // default particle kinematic
73
74 G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
75 G4String particleName;
76 G4ParticleDefinition* particle
77 = particleTable->FindParticle(particleName="e-");
78 particleGun->SetParticleDefinition(particle);
79 particleGun->SetParticleMomentumDirection(G4ThreeVector(0.,0.,-1.));
80 particleGun->SetParticleEnergy(30.*MeV);
81 G4double position = 0.5*(GammaRayTelDetector->GetWorldSizeZ());
82 particleGun->SetParticlePosition(G4ThreeVector(0.*cm,0.*cm,position));
83 particleSource = new G4GeneralParticleSource();
84
85}
86
87//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
88
89GammaRayTelPrimaryGeneratorAction::~GammaRayTelPrimaryGeneratorAction()
90{
91 if (sourceGun)
92 delete particleGun;
93 else
94 delete particleSource;
95
96 delete gunMessenger;
97}
98
99//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
100
101void GammaRayTelPrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
102{
103 if (sourceGun)
104 {
105
106 //this function is called at the begining of event
107 //
108 G4double z0 = 0.5*(GammaRayTelDetector->GetWorldSizeZ());
109 G4double x0 = 0.*cm, y0 = 0.*cm;
110
111 G4ThreeVector pos0;
112 G4ThreeVector dir0;
113 G4ThreeVector vertex0 = G4ThreeVector(x0,y0,z0);
114
115 dir0 = G4ThreeVector(0.,0.,-1.);
116
117 G4double theta, phi, y, f;
118 G4double theta0=0.;
119 G4double phi0=0.;
120
121 switch(nSourceType) {
122 case 0:
123 particleGun->SetParticlePosition(vertex0);
124 particleGun->SetParticleMomentumDirection(dir0);
125 break;
126 case 1:
127 // GS: Generate random position on the 4PIsphere to create a unif. distrib.
128 // GS: on the sphere
129 phi = G4UniformRand() * twopi;
130 do {
131 y = G4UniformRand()*1.0;
132 theta = G4UniformRand() * pi;
133 f = std::sin(theta);
134 } while (y > f);
135 vertex0 = G4ThreeVector(1.,0.,0.);
136 vertex0.setMag(dVertexRadius);
137 vertex0.setTheta(theta);
138 vertex0.setPhi(phi);
139 particleGun->SetParticlePosition(vertex0);
140
141 dir0 = G4ThreeVector(1.,0.,0.);
142 do {
143 phi = G4UniformRand() * twopi;
144 do {
145 y = G4UniformRand()*1.0;
146 theta = G4UniformRand() * pi;
147 f = std::sin(theta);
148 } while (y > f);
149 dir0.setPhi(phi);
150 dir0.setTheta(theta);
151 } while (vertex0.dot(dir0) >= -0.7 * vertex0.mag());
152 particleGun->SetParticleMomentumDirection((G4ParticleMomentum)dir0);
153
154 break;
155 case 2:
156 // GS: Generate random position on the upper semi-sphere z>0 to create a unif. distrib.
157 // GS: on a plane
158 phi = G4UniformRand() * twopi;
159 do {
160 y = G4UniformRand()*1.0;
161 theta = G4UniformRand() * halfpi;
162 f = std::sin(theta) * std::cos(theta);
163 } while (y > f);
164 vertex0 = G4ThreeVector(1.,0.,0.);
165
166 G4double xy = GammaRayTelDetector->GetWorldSizeXY();
167 G4double z = GammaRayTelDetector->GetWorldSizeZ();
168
169 if (dVertexRadius > xy*0.5)
170 {
171 G4cout << "vertexRadius too big " << G4endl;
172 G4cout << "vertexRadius setted to " << xy*0.45 << G4endl;
173 dVertexRadius = xy*0.45;
174 }
175
176 if (dVertexRadius > z*0.5)
177 {
178 G4cout << "vertexRadius too high " << G4endl;
179 G4cout << "vertexRadius setted to " << z*0.45 << G4endl;
180 dVertexRadius = z*0.45;
181 }
182
183
184 vertex0.setMag(dVertexRadius);
185 vertex0.setTheta(theta);
186 vertex0.setPhi(phi);
187
188 // GS: Get the user defined direction for the primaries and
189 // GS: Rotate the random position according to the user defined direction for the particle
190
191 dir0 = particleGun->GetParticleMomentumDirection();
192 if (dir0.mag() > 0.001)
193 {
194 theta0 = dir0.theta();
195 phi0 = dir0.phi();
196 }
197
198 if (theta0!=0.)
199 {
200 G4ThreeVector rotationAxis(1.,0.,0.);
201 rotationAxis.setPhi(phi0+halfpi);
202 vertex0.rotate(theta0+pi,rotationAxis);
203 }
204 particleGun->SetParticlePosition(vertex0);
205 break;
206 }
207
208
209 G4double pEnergy;
210
211 switch(nSpectrumType) {
212 case 0:
213 break;
214 case 1:
215 break;
216 case 2:
217 do {
218 y = G4UniformRand()*100000.0;
219 pEnergy = G4UniformRand() * 10. * GeV;
220 f = std::pow(pEnergy * (1/GeV), -4.);
221 } while (y > f);
222
223 particleGun->SetParticleEnergy(pEnergy);
224
225 break;
226 case 3:
227 break;
228 }
229
230 particleGun->GeneratePrimaryVertex(anEvent);
231 }
232 else
233 {
234 particleSource->GeneratePrimaryVertex(anEvent);
235 }
236
237}
238
239//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
240
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