Import Geant4 11.0.0 source tree

2021-12-10 14:46:44 +01:00
parent 6399a014b6
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+//
+// ********************************************************************
+// * License and Disclaimer                                           *
+// *                                                                  *
+// * The  Geant4 software  is  copyright of the Copyright Holders  of *
+// * the Geant4 Collaboration.  It is provided  under  the terms  and *
+// * conditions of the Geant4 Software License,  included in the file *
+// * LICENSE and available at  http://cern.ch/geant4/license .  These *
+// * include a list of copyright holders.                             *
+// *                                                                  *
+// * Neither the authors of this software system, nor their employing *
+// * institutes,nor the agencies providing financial support for this *
+// * work  make  any representation or  warranty, express or implied, *
+// * regarding  this  software system or assume any liability for its *
+// * use.  Please see the license in the file  LICENSE  and URL above *
+// * for the full disclaimer and the limitation of liability.         *
+// *                                                                  *
+// * This  code  implementation is the result of  the  scientific and *
+// * technical work of the GEANT4 collaboration.                      *
+// * By using,  copying,  modifying or  distributing the software (or *
+// * any work based  on the software)  you  agree  to acknowledge its *
+// * use  in  resulting  scientific  publications,  and indicate your *
+// * acceptance of all terms of the Geant4 Software license.          *
+// ********************************************************************
+//
+//
+/// \file PrimaryGeneratorAction.cc
+/// \brief Implementation of the B1::PrimaryGeneratorAction class
+
+#include "PrimaryGeneratorAction.hh"
+
+#include "G4LogicalVolumeStore.hh"
+#include "G4LogicalVolume.hh"
+#include "G4Box.hh"
+#include "G4RunManager.hh"
+#include "G4ParticleGun.hh"
+#include "G4ParticleTable.hh"
+#include "G4ParticleDefinition.hh"
+#include "G4SystemOfUnits.hh"
+#include "Randomize.hh"
+
+namespace B1
+{
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
+
+PrimaryGeneratorAction::PrimaryGeneratorAction()
+{
+  G4int n_particle = 1;
+  fParticleGun  = new G4ParticleGun(n_particle);
+
+  // default particle kinematic
+  G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
+  G4String particleName;
+  G4ParticleDefinition* particle
+    = particleTable->FindParticle(particleName="gamma");
+  fParticleGun->SetParticleDefinition(particle);
+  fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0.,0.,1.));
+  fParticleGun->SetParticleEnergy(6.*MeV);
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
+
+PrimaryGeneratorAction::~PrimaryGeneratorAction()
+{
+  delete fParticleGun;
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
+
+void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
+{
+  //this function is called at the begining of ecah event
+  //
+
+  // In order to avoid dependence of PrimaryGeneratorAction
+  // on DetectorConstruction class we get Envelope volume
+  // from G4LogicalVolumeStore.
+
+  G4double envSizeXY = 0;
+  G4double envSizeZ = 0;
+
+  if (!fEnvelopeBox)
+  {
+    G4LogicalVolume* envLV
+      = G4LogicalVolumeStore::GetInstance()->GetVolume("Envelope");
+    if ( envLV ) fEnvelopeBox = dynamic_cast<G4Box*>(envLV->GetSolid());
+  }
+
+  if ( fEnvelopeBox ) {
+    envSizeXY = fEnvelopeBox->GetXHalfLength()*2.;
+    envSizeZ = fEnvelopeBox->GetZHalfLength()*2.;
+  }
+  else  {
+    G4ExceptionDescription msg;
+    msg << "Envelope volume of box shape not found.\n";
+    msg << "Perhaps you have changed geometry.\n";
+    msg << "The gun will be place at the center.";
+    G4Exception("PrimaryGeneratorAction::GeneratePrimaries()",
+     "MyCode0002",JustWarning,msg);
+  }
+
+  G4double size = 0.8;
+  G4double x0 = size * envSizeXY * (G4UniformRand()-0.5);
+  G4double y0 = size * envSizeXY * (G4UniformRand()-0.5);
+  G4double z0 = -0.5 * envSizeZ;
+
+  fParticleGun->SetParticlePosition(G4ThreeVector(x0,y0,z0));
+
+  fParticleGun->GeneratePrimaryVertex(anEvent);
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
+
+}
+
+