ExExChPrimaryGeneratorAction.cc

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#include "ExExChPrimaryGeneratorAction.hh"

#include "G4RunManager.hh"
#include "G4Event.hh"
#include "G4ParticleTable.hh"
#include "G4ParticleDefinition.hh"
#include "Randomize.hh"

#include "G4GeneralParticleSource.hh"

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ExExChPrimaryGeneratorAction::ExExChPrimaryGeneratorAction()
{
    fParticleGun = new G4GeneralParticleSource();
    
    fParticleGun->SetParticleDefinition(G4ParticleTable::
                        GetParticleTable()->FindParticle("proton"));
    
    // Position distribution
    G4SPSPosDistribution *vPosDist =
        fParticleGun->GetCurrentSource()->GetPosDist();
    vPosDist->SetPosDisType("Beam");
    vPosDist->SetPosDisShape("Circle");
    vPosDist->SetCentreCoords(G4ThreeVector(0.,0.,(- 10.5) * CLHEP::meter));
    vPosDist->SetBeamSigmaInR(0.0 * CLHEP::mm);
    
    // Angular distribution
    G4SPSAngDistribution *vAngDist =
        fParticleGun->GetCurrentSource()->GetAngDist();
    vAngDist->DefineAngRefAxes("angref1",G4ThreeVector(1.,0.,0));
    vAngDist->DefineAngRefAxes("angref2",G4ThreeVector(0.,-1.,0));
    vAngDist->SetAngDistType("beam2d");
    vAngDist->SetBeamSigmaInAngX(13.36E-6 * CLHEP::rad);
    vAngDist->SetBeamSigmaInAngY(11.25E-6 * CLHEP::rad);

    // Energy distribution
    G4SPSEneDistribution *vEneDist =
        fParticleGun->GetCurrentSource()->GetEneDist();
    vEneDist->SetEnergyDisType("Mono");
    vEneDist->SetMonoEnergy(400. * CLHEP::GeV);
}

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ExExChPrimaryGeneratorAction::~ExExChPrimaryGeneratorAction(){
    delete fParticleGun;
}

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void ExExChPrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent){
    fParticleGun->GeneratePrimaryVertex(anEvent);
}

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