UFRO Master Fisica Medica 5 3 Geant4

5. Técnicas de Simulación
3. Geant4
Dr. Willy H. Gerber
Instituto de Fisica
Universidad Austral
Valdivia, Chile

Objetivos: Comprender como se estructuran programas
que simulan procesos basados en Geant4.

1
www.gphysics.net – UFRO-2008-Master-Fisica-Medica-5-3-Geant4-05.09

Estructura de archivos

Demo
Include

ExDetectorConstruction.hh
ExPhysicsList.hh

ExPrimaryGeneratorAction.hh
src
ExDetectorConstruction.cc

ExPhysicsList.cc

ExPrimaryGeneratorAction.cc

MainDemo.cc

2

Programas Geant4

Includes
necesarios

int main(int argc,char** argv)
{
Setear
runManager

Definir
Output

Ejecutar
Proceso
delete visManager;
delete runManager;
return 0;
}
3

Estructuras a incluir

#include quot;G4RunManager.hhquot;
#include quot;G4UImanager.hhquot;
#include quot;G4UIterminal.hhquot;
#include quot;G4VisExecutive.hhquot;

#include quot;ExDetectorConstruction.hhquot;
#include quot;ExPhysicsList.hhquot;
#include quot;ExPrimaryGeneratorAction.hh“

#include “ExRunAction.hhquot;
#include “ExEventAction.hhquot;
#include “ExSteppingAction.hhquot;

#include “G4templates.hhquot;

4

Inicialización runManager - Clases

Construction del runManager
G4RunManager* runManager = new G4RunManager;

Clases obligatorias de inicialización
runManager->SetUserInitialization(new ExDetectorConstruction);
runManager->SetUserInitialization(new ExPhysicsList);

Clases obligatorias respecto de acciones
runManager->SetUserAction(new ExPrimaryGeneratorAction);
runManager->SetUserAction(new ExRunAction);
runManager->SetUserAction(new ExEventAction);
runManager->SetUserAction(new ExSteppingAction);

5

Inicializacion runManager

Inicializacion del Display

G4UImanager* UI = G4UImanager::GetUIpointer();

UI->ApplyCommand(quot;/run/verbose 1quot;);
UI->ApplyCommand(quot;/event/verbose 1quot;);
UI->ApplyCommand(quot;/tracking/verbose 1quot;);

Inicializacion …
G4VisManager* visManager = new G4VisExecutive;
visManager->Initialize();

Inicializacion el sistema
runManager->Initialize();

6

Ejecutar

Ejecución

int numberOfEvent = 3;
runManager->BeamOn(numberOfEvent);

if(argc==1)
// Define (G)UI terminal for interactive mode
{
G4UIsession * session = new G4UIterminal;
UI->ApplyCommand(quot;/control/execute prerun.g4macquot;);
session->sessionStart();
delete session;
} else
// Batch mode
{
G4String command = quot;/control/execute quot;;
G4String fileName = argv[1];
UI->ApplyCommand(command+fileName);
}

7

Includes y Subrutinas

Includes y Subrutinas


ExDetectorConstruction - demo

ExDetectorConstruction


ExDetectorConstruction

Lógica de la rutina con solo 2 elementos

Crear caja (volumen World)
Crear cilindro

Crear volumen lógico para caja
Crear volumen lógico para cilindro

Posicionar cilindro
Posicionar caja



Crear caja – clase G4Box (volumen World)
G4double expHall_x = 3.0*m;
G4double expHall_y = 1.0*m;
G4double expHall_z = 1.0*m;

G4Box* experimentalHall_box = new G4Box(quot;expHall_boxquot;,expHall_x,expHall_y,expHall_z);

Crear cilindro – clase G4Tubs
G4double innerRadiusOfTheTube = 0.*cm;
G4double outerRadiusOfTheTube = 60.*cm;
G4double hightOfTheTube = 25.*cm;
G4double startAngleOfTheTube = 0.*deg;
G4double spanningAngleOfTheTube = 360.*deg;

G4Tubs* tracker_tube = new G4Tubs(quot;tracker_tubequot;, innerRadiusOfTheTube,
outerRadiusOfTheTube, hightOfTheTube,
startAngleOfTheTube, spanningAngleOfTheTube);



Crear volumen lógico para caja – clase G4LogicalVolume

G4LogicalVolume* experimentalHall_log =
new G4LogicalVolume(experimentalHall_box,Ar,quot;expHall_logquot;);

Crear volumen lógico para cilindro – clase G4LogicalVolume

G4LogicalVolume* tracker_log =
new G4LogicalVolume(tracker_tube,Al,quot;tracker_logquot;);

Posicionar cilindroc
G4double trackerPos_x = -1.0*meter;
G4double trackerPos_y = 0.0*meter;
G4double trackerPos_z = 0.0*meter;

G4VPhysicalVolume* tracker_phys = new G4PVPlacement(0, // no rotation
G4ThreeVector(trackerPos_x,trackerPos_y,trackerPos_z), // translation position
tracker_log, // its logical volume
quot;trackerquot;, // its name experimentalHall_log, // its mother (logical)
volume false, // no boolean
operations 0); // its copy number


Posicionar caja – clase G4LogicalVolume

G4VPhysicalVolume* experimentalHall_phys = new G4PVPlacement(0, // no rotation
G4ThreeVector(0.,0.,0.), // translation position
experimentalHall_log, // its logical volume
quot;expHallquot;, // its name
0, // its mother volume
false, // no boolean
operations 0); // its copy number



Material (directo)

G4double density = 1.390*g/cm3;
G4double a = 39.95*g/mole;
G4Material* lAr = new G4Material(name=quot;liquidArgonquot;, z=18., a, density);

G4LogicalVolume* myLbox = new G4LogicalVolume(aBox,lAr,quot;Lboxquot;,0,0,0);

Elementos

a = 1.01*g/mole;
G4Element* elH = new G4Element(name=quot;Hydrogenquot;,symbol=quot;Hquot; , z= 1., a);
a = 16.00*g/mole;
G4Element* elO = new G4Element(name=quot;Oxygenquot; ,symbol=quot;Oquot; , z= 8., a);
density = 1.000*g/cm3;

Material (compuesto desde elementos, por numero de elementos)

G4Material* H2O = new G4Material(name=quot;Waterquot;,density,ncomponents=2);
H2O->AddElement(elH, natoms=2);
H2O->AddElement(elO, natoms=1);



Elementos

a = 14.01*g/mole;
G4Element* elN = new G4Element(name=quot;Nitrogenquot;,symbol=quot;Nquot; , z= 7., a);
a = 16.00*g/mole;
G4Element* elO = new G4Element(name=quot;Oxygenquot; ,symbol=quot;Oquot; , z= 8., a);

Material (compuesto desde elementos, por fracción de átomos)

density = 1.290*mg/cm3;
G4Material* Air = new G4Material(name=quot;Air quot;,density,ncomponents=2);
Air->AddElement(elN, fractionmass=70*perCent);
Air->AddElement(elO, fractionmass=30*perCent);


ExDetectorConstruction.hh – primer parte

class G4LogicalVolume;
class G4VPhysicalVolume;

#include quot;G4VUserDetectorConstruction.hhquot;

class ExDetectorConstruction : public
G4VUserDetectorConstruction
{
public:

ExDetectorConstruction();
~ExDetectorConstruction();

G4VPhysicalVolume* Construct();


ExDetectorConstruction.hh – segunda parte

private:

// Logical volumes
//
G4LogicalVolume* experimentalHall_log;
G4LogicalVolume* tracker_log;
G4LogicalVolume* calorimeterBlock_log;
G4LogicalVolume* calorimeterLayer_log;

// Physical volumes
//
G4VPhysicalVolume* experimentalHall_phys;
G4VPhysicalVolume* calorimeterLayer_phys;
G4VPhysicalVolume* calorimeterBlock_phys;
G4VPhysicalVolume* tracker_phys;
};


ExDetectorConstruction.cc – primera parte

#include quot;ExDetectorConstruction.hhquot;

#include quot;G4Material.hhquot;
#include quot;G4Box.hhquot;
#include quot;G4Tubs.hhquot;
#include quot;G4LogicalVolume.hhquot;
#include quot;G4ThreeVector.hhquot;
#include quot;G4PVPlacement.hhquot;
#include quot;globals.hhquot;

ExDetectorConstruction::ExDetectorConstruction()
: experimentalHall_log(0), tracker_log(0),
calorimeterBlock_log(0), calorimeterLayer_log(0),
experimentalHall_phys(0), calorimeterLayer_phys(0),
calorimeterBlock_phys(0), tracker_phys(0)
{;}

ExDetectorConstruction::~ExDetectorConstruction()
{
}


ExDetectorConstruction.cc – segunda parte

G4VPhysicalVolume* ExN01DetectorConstruction::Construct()
{

//------------------------------------------------------ materials

G4double a; // atomic mass
G4double z; // atomic number
G4double density;

G4Material* Ar = new G4Material(quot;ArgonGasquot;, z= 18., a= 39.95*g/mole, density= 1.782*mg/cm3);

G4Material* Al = new G4Material(quot;Aluminumquot;, z= 13., a= 26.98*g/mole, density= 2.7*g/cm3);

G4Material* Pb = new G4Material(quot;Leadquot;, z= 82., a= 207.19*g/mole, density= 11.35*g/cm3);


ExDetectorConstruction.cc – tercera parte

//------------------------------------------------------ volumes

//------------------------------ experimental hall (world volume)
//------------------------------ beam line along x axis

G4double expHall_x = 3.0*m;
G4double expHall_y = 1.0*m;
G4double expHall_z = 1.0*m;

G4Box* experimentalHall_box = new G4Box(quot;expHall_boxquot;,expHall_x,expHall_y,expHall_z);
experimentalHall_log = new G4LogicalVolume(experimentalHall_box, Ar,quot;expHall_logquot;,0,0,0);
experimentalHall_phys = new G4PVPlacement(0,G4ThreeVector(),
experimentalHall_log,quot;expHallquot;,0,false,0);


ExDetectorConstruction.cc – cuarta parte

//------------------------------ a tracker tube

G4double innerRadiusOfTheTube = 0.*cm;
G4double outerRadiusOfTheTube = 60.*cm;
G4double hightOfTheTube = 50.*cm;
G4double startAngleOfTheTube = 0.*deg;
G4double spanningAngleOfTheTube = 360.*deg;

G4Tubs* tracker_tube = new G4Tubs(quot;tracker_tubequot;,innerRadiusOfTheTube,
outerRadiusOfTheTube,hightOfTheTube,
startAngleOfTheTube,spanningAngleOfTheTube);
tracker_log = new G4LogicalVolume(tracker_tube,Al,quot;tracker_logquot;,0,0,0);

G4double trackerPos_x = -1.0*m;
G4double trackerPos_y = 0.*m;
G4double trackerPos_z = 0.*m;

tracker_phys = new G4PVPlacement(0,
G4ThreeVector(trackerPos_x,trackerPos_y,trackerPos_z),
tracker_log,quot;trackerquot;,experimentalHall_log,false,0);


ExDetectorConstruction.cc – quinta parte

//------------------------------ a calorimeter block

G4double block_x = 1.0*m;
G4double block_y = 50.0*cm;
G4double block_z = 50.0*cm;

G4Box* calorimeterBlock_box = new G4Box(quot;calBlock_boxquot;,block_x, block_y,block_z);
calorimeterBlock_log = new G4LogicalVolume(calorimeterBlock_box, Pb,quot;caloBlock_logquot;,0,0,0);

G4double blockPos_x = 1.0*m;
G4double blockPos_y = 0.0*m;
G4double blockPos_z = 0.0*m;

calorimeterBlock_phys = new G4PVPlacement(0,
G4ThreeVector(blockPos_x,blockPos_y,blockPos_z),
calorimeterBlock_log,quot;caloBlockquot;,
experimentalHall_log,false,0);


ExDetectorConstruction.cc – sesta parte

//------------------------------ calorimeter layers (20 elements)
G4double calo_x = 1.*cm;
G4double calo_y = 40.*cm;
G4double calo_z = 40.*cm;

G4Box* calorimeterLayer_box = new G4Box(quot;caloLayer_box“, calo_x,calo_y,calo_z);
calorimeterLayer_log = new G4LogicalVolume(calorimeterLayer_box, Al,quot;caloLayer_logquot;,0,0,0);

for(G4int i=0;i<19;i++) // loop for 19 layers
{
G4double caloPos_x = (i-9)*10.*cm;
G4double caloPos_y = 0.0*m;
G4double caloPos_z = 0.0*m;
calorimeterLayer_phys = new G4PVPlacement(0,
G4ThreeVector(caloPos_x,caloPos_y,caloPos_z),
calorimeterLayer_log,quot;caloLayerquot;,calorimeterBlock_log,false,i);
}

//------------------------------------------------------------------
return experimentalHall_phys;
}


ExPhysicsList

ExPhysicsList


Definición de partículas

G4String GetParticleName() particle name
G4double GetPDGMass() mass
G4double GetPDGWidth() decay width
G4double GetPDGCharge() electric charge
G4double GetPDGSpin() spin
G4double GetPDGMagneticMoment() magnetic moment (a)
G4int GetPDGiParity() parity (b)
G4int GetPDGiConjugation() charge conjugation (b)
G4double GetPDGIsospin() iso-spin
G4double GetPDGIsospin3() 3rd-component of iso-spin
G4int GetPDGiGParity() G-parity (0:not defined)
G4String GetParticleType() particle type
G4String GetParticleSubType() particle sub-type
G4int GetLeptonNumber() lepton number
G4int GetBaryonNumber() baryon number
G4int GetPDGEncoding() particle encoding number by PDG
G4int GetAntiPDGEncoding() encoding for anti-particle of this particle

a: 0: not defined or no mag. Moment
b: 0:not defined

Definición de partículas

G4bool GetPDGStable() stable flag
G4double GetPDGLifeTime() life time
G4DecayTable *GetDecayTable() decay table


Variables dinámicas

G4double theDynamicalMass dynamical mass
G4ThreeVector theMomentumDirection normalized momentum vector
G4ParticleDefinition *theParticleDefinition definition of particle
G4double theDynamicalSpin dynamical spin (1)
G4ThreeVector thePolarization polarization vector
G4double theMagneticMoment dynamical magnetic moment (2)
G4double theKineticEnergy kinetic energy
G4double theProperTime proper time
G4double theDynamicalCharge dynamical electric charge (3)
G4ElectronOccupancy *theElectronOccupancy electron orbits for ions

1. i.e. total angular momentum as a ion/atom
2. i.e. total magnetic moment as a ion/atom
3. i.e. total electric charge as a ion/atom


ExPhysicsList - demo

ExPhysicsList.hh
protected:

// Construct particle and physics
void ConstructParticle();
void ConstructProcess();
void SetCuts();

// these methods Construct particles
void ConstructBosons();
void ConstructLeptons();
void ConstructMesons();
void ConstructBaryons();

protected:

// these methods Construct physics processes and register them
void ConstructGeneral();
void ConstructEM();
void AddStepMax();



ExPhysicsList.cc
#include quot;G4ProcessManager.hhquot;
#include quot;G4ParticleTypes.hhquot;
void ExPhysicsList::ConstructParticle()
{
G4Proton::ProtonDefinition();

ConstructBosons();
ConstructLeptons();
ConstructMesons();
ConstructBaryons();

G4Geantino::GeantinoDefinition();
}
void ExPhysicsList::ConstructBosons()
{
G4Geantino::GeantinoDefinition(); // pseudo-particles
G4ChargedGeantino::ChargedGeantinoDefinition();

G4Gamma::GammaDefinition(); // gamma
}


void ExPhysicsList::ConstructLeptons()
{
G4Electron::ElectronDefinition(); // e-
G4Positron::PositronDefinition(); // e+ Construir todos de una vez:
G4MuonPlus::MuonPlusDefinition(); // mu+ G4LeptonConstructor pConstructor;
G4MuonMinus::MuonMinusDefinition(); // mu- pConstructor.ConstructParticle();
G4NeutrinoE::NeutrinoEDefinition(); // nu_e
G4AntiNeutrinoE::AntiNeutrinoEDefinition(); // nu_e
G4NeutrinoMu::NeutrinoMuDefinition(); // nu_mu
G4AntiNeutrinoMu::AntiNeutrinoMuDefinition(); // nu_mu
}
void ExPhysicsList::ConstructBaryons()
{
G4Proton::ProtonDefinition();
G4AntiProton::AntiProtonDefinition();
G4Neutron::NeutronDefinition();
G4AntiNeutron::AntiNeutronDefinition();
}



void ExPhysicsList::ConstructMesons()
{
G4PionPlus::PionPlusDefinition();
G4PionMinus::PionMinusDefinition();
G4PionZero::PionZeroDefinition();
G4Eta::EtaDefinition();
G4EtaPrime::EtaPrimeDefinition();
G4KaonPlus::KaonPlusDefinition();
G4KaonMinus::KaonMinusDefinition();
G4KaonZero::KaonZeroDefinition();
G4AntiKaonZero::AntiKaonZeroDefinition();
G4KaonZeroLong::KaonZeroLongDefinition();
G4KaonZeroShort::KaonZeroShortDefinition();
}

void ExPhysicsList::ConstructProcess()
{
AddTransportation();
ConstructEM();
ConstructGeneral();
AddStepMax();
}



#include quot;G4ComptonScattering.hhquot;
#include quot;G4GammaConversion.hhquot;
#include quot;G4PhotoElectricEffect.hhquot;

#include quot;G4eMultipleScattering.hhquot;
#include quot;G4hMultipleScattering.hhquot;

#include quot;G4eIonisation.hhquot;
#include quot;G4eBremsstrahlung.hhquot;
#include quot;G4eplusAnnihilation.hhquot;

#include quot;G4MuIonisation.hhquot;
#include quot;G4MuBremsstrahlung.hhquot;
#include quot;G4MuPairProduction.hhquot;

#include quot;G4hIonisation.hhquot;
#include quot;G4hBremsstrahlung.hhquot;
#include quot;G4hPairProduction.hhquot;

#include quot;G4ionIonisation.hhquot;


void ExN02PhysicsList::ConstructEM()
{
theParticleIterator->reset();
while( (*theParticleIterator)() ){
G4ParticleDefinition* particle = theParticleIterator->value();
G4ProcessManager* pmanager = particle->GetProcessManager();
G4String particleName = particle->GetParticleName();

if (particleName == quot;gammaquot;) { // gamma
pmanager->AddDiscreteProcess(new G4PhotoElectricEffect);
pmanager->AddDiscreteProcess(new G4ComptonScattering);
pmanager->AddDiscreteProcess(new G4GammaConversion);

} else if (particleName == quot;e-quot;) { //electron
pmanager->AddProcess(new G4eMultipleScattering, -1, 1, 1);
pmanager->AddProcess(new G4eIonisation, -1, 2, 2);
pmanager->AddProcess(new G4eBremsstrahlung, -1, 3, 3);

} else if (particleName == quot;e+quot;) { //positron
pmanager->AddProcess(new G4eMultipleScattering, -1, 1, 1);
pmanager->AddProcess(new G4eIonisation, -1, 2, 2);
pmanager->AddProcess(new G4eBremsstrahlung, -1, 3, 3);
pmanager->AddProcess(new G4eplusAnnihilation, 0,-1, 4);

} else if( particleName == quot;mu+quot; || particleName == quot;mu-quot; ) { //muon
pmanager->AddProcess(new G4hMultipleScattering, -1, 1, 1);
pmanager->AddProcess(new G4MuIonisation, -1, 2, 2);
pmanager->AddProcess(new G4MuBremsstrahlung, -1, 3, 3);
pmanager->AddProcess(new G4MuPairProduction, -1, 4, 4);

} else if( particleName == quot;protonquot; || particleName == quot;pi-quot; || particleName == quot;pi+quot; ) { //proton
pmanager->AddProcess(new G4hIonisation, -1, 2, 2);
pmanager->AddProcess(new G4hBremsstrahlung, -1, 3, 3);
pmanager->AddProcess(new G4hPairProduction, -1, 4, 4);

} else if( particleName == quot;alphaquot; || particleName == quot;He3quot; || particleName == quot;GenericIonquot; ) {//Ions
pmanager->AddProcess(new G4ionIonisation, -1, 2, 2);

} else if ((!particle->IsShortLived()) && (particle->GetPDGCharge() != 0.0) &&
(particle->GetParticleName() != quot;chargedgeantinoquot;)) { //all others charged particles except geantino
pmanager->AddProcess(new G4hIonisation, -1, 2, 2);
}
}
}


#include quot;G4Decay.hhquot;

void ExN02PhysicsList::ConstructGeneral()
{
// Add Decay Process
G4Decay* theDecayProcess = new G4Decay();
while( (*theParticleIterator)() ){
if (theDecayProcess->IsApplicable(*particle)) {
pmanager ->AddProcess(theDecayProcess);
// set ordering for PostStepDoIt and AtRestDoIt
pmanager ->SetProcessOrdering(theDecayProcess, idxPostStep);
pmanager ->SetProcessOrdering(theDecayProcess, idxAtRest);
}
}
}



#include quot;G4StepLimiter.hhquot;
#include quot;G4UserSpecialCuts.hhquot;

void ExPhysicsList::AddStepMax()
{
// Step limitation seen as a process
G4StepLimiter* stepLimiter = new G4StepLimiter();
////G4UserSpecialCuts* userCuts = new G4UserSpecialCuts();

while ((*theParticleIterator)())
{

if (particle->GetPDGCharge() != 0.0)
{
pmanager ->AddDiscreteProcess(stepLimiter);
////pmanager ->AddDiscreteProcess(userCuts);
}
}
}


ExPhysicsList::ExPhysicsList(): G4VUserPhysicsList()
{ // default cut
value (1.0mm) defaultCutValue = 1.0*mm;
}

void ExPhysicsList::SetCuts()
{
// the default cut value for all particle types
SetCutsWithDefault();

// specific cut values
SetCutValue(cutForGamma, quot;gammaquot;);
SetCutValue(cutForElectron, quot;e-quot;);
SetCutValue(cutForElectron, quot;e+quot;);

if (verboseLevel>0) DumpCutValuesTable();
}


ExPhysicsList.hh

#include quot;G4VUserPhysicsList.hhquot;

class ExPhysicsList: public G4VUserPhysicsList
{
public:
ExPhysicsList();
~ExPhysicsList();

protected:
// Construct particle and physics process
void ConstructParticle();
void ConstructProcess();
void SetCuts();
};


ExPhysicsList.cc – primera parte

#include quot;G4ParticleTypes.hhquot;

ExPhysicsList::ExPhysicsList()
{;}

ExPhysicsList::~ExPhysicsList()
{;}

void ExPhysicsList::ConstructParticle()
{
// In this method, static member functions should be called
// for all particles which you want to use.
// This ensures that objects of these particle types will be
// created in the program.

G4Geantino::GeantinoDefinition();
}


ExPhysicsList.cc – segunda parte

void ExPhysicsList::ConstructProcess()
{
// Define transportation process

AddTransportation();
}

void ExPhysicsList::SetCuts()
{
// uppress error messages even in case e/gamma/proton do not exist
G4int temp = GetVerboseLevel();
SetVerboseLevel(0);
// quot; G4VUserPhysicsList::SetCutsWithDefaultquot; method sets
// the default cut value for all particle types
SetCutsWithDefault();

// Retrieve verbose level
SetVerboseLevel(temp);
}


ExPrimaryGeneratorAction

ExPrimaryGeneratorAction


ExPrimaryGeneratorAction - demo

Definición de partícula disparadas
G4int n_particle = 1;
particleGun = new G4ParticleGun(n_particle);

particleGun->SetParticleDefinition(G4Geantino::GeantinoDefinition());
particleGun->SetParticleEnergy(1.0*GeV);
particleGun->SetParticlePosition(G4ThreeVector(-2.0*m,0.0*m,0.0*m));

Seteos posibles

void SetParticleDefinition(G4ParticleDefinition*)
void SetParticleMomentum(G4ParticleMomentum)
void SetParticleMomentumDirection(G4ThreeVector)
void SetParticleEnergy(G4double)
void SetParticleTime(G4double)
void SetParticlePosition(G4ThreeVector)
void SetParticlePolarization(G4ThreeVector)
void SetNumberOfParticles(G4int)


ExPrimaryGeneratorAction.hh

#include quot;G4VUserPrimaryGeneratorAction.hhquot;

class G4ParticleGun;
class G4Event;

class ExPrimaryGeneratorAction : public
G4VUserPrimaryGeneratorAction
{
public:
ExPrimaryGeneratorAction();
~ExPrimaryGeneratorAction();

public:
void GeneratePrimaries(G4Event* anEvent);

private:
G4ParticleGun* particleGun;
};


ExPrimaryGeneratorAction.cc – primera parte
#include quot;ExPrimaryGeneratorAction.hhquot;

#include quot;G4Event.hhquot;
#include quot;G4ParticleGun.hhquot;
#include quot;G4ParticleTable.hhquot;
#include quot;G4ParticleDefinition.hhquot;

ExPrimaryGeneratorAction::ExPrimaryGeneratorAction()
{
G4int n_particle = 1;
particleGun = new G4ParticleGun(n_particle);

G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
G4ParticleDefinition* particle = particleTable->FindParticle(quot;protonquot;);

G4String particleName;
// find in particle table
particleGun->SetParticleDefinition(particleTable->FindParticle(particleName=quot;geantinoquot;));
// use defined particle
particleGun->SetParticleDefinition(particle);
particleGun->SetParticleEnergy(1.0*GeV);
particleGun->SetParticlePosition(G4ThreeVector(-2.0*m, 0.0, 0.0));
} www.gphysics.net – UFRO-2008-Master-Fisica-Medica-5-3-Geant4-05.09

ExPrimaryGeneratorAction.cc – segunda parte
ExPrimaryGeneratorAction::~ExN01PrimaryGeneratorAction()
{
delete particleGun;
}

void ExPrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{
G4int i = anEvent->get_eventID() % 3;
switch(i)
{
case 0: particleGun->SetParticleMomentumDirection(G4ThreeVector(1.0,0.0,0.0));
break;
break;
break;
}
particleGun->generatePrimaryVertex(anEvent);
}


UFRO Master Fisica Medica 5 3 Geant4

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