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B2PrimaryGeneratorAction.cc
Go to the documentation of this file.
Or view
the newest version in sPHENIX GitHub for file B2PrimaryGeneratorAction.cc
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//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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//
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#include "B2PrimaryGeneratorAction.hh"
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#include "
G4LogicalVolumeStore.hh
"
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#include "
G4LogicalVolume.hh
"
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#include "
G4Box.hh
"
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#include "
G4Event.hh
"
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#include "
G4ParticleGun.hh
"
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#include "
G4ParticleTable.hh
"
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#include "
G4ParticleDefinition.hh
"
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#include "
G4SystemOfUnits.hh
"
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#include "
Randomize.hh
"
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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B2PrimaryGeneratorAction::B2PrimaryGeneratorAction
()
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:
G4VUserPrimaryGeneratorAction
()
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{
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G4int
nofParticles = 1;
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fParticleGun
=
new
G4ParticleGun
(nofParticles);
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// default particle kinematic
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G4ParticleDefinition
* particleDefinition
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=
G4ParticleTable::GetParticleTable
()->
FindParticle
(
"proton"
);
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fParticleGun
->
SetParticleDefinition
(particleDefinition);
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fParticleGun
->
SetParticleMomentumDirection
(
G4ThreeVector
(0.,0.,1.));
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fParticleGun
->
SetParticleEnergy
(3.0*
GeV
);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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B2PrimaryGeneratorAction::~B2PrimaryGeneratorAction
()
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{
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delete
fParticleGun
;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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void
B2PrimaryGeneratorAction::GeneratePrimaries
(
G4Event
* anEvent)
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{
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// This function is called at the begining of event
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// In order to avoid dependence of PrimaryGeneratorAction
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// on DetectorConstruction class we get world volume
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// from G4LogicalVolumeStore.
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G4double
worldZHalfLength = 0;
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G4LogicalVolume
* worldLV
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=
G4LogicalVolumeStore::GetInstance
()->
GetVolume
(
"World"
);
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G4Box
* worldBox = NULL;
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if
( worldLV ) worldBox =
dynamic_cast<
G4Box
*
>
(worldLV->
GetSolid
());
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if
( worldBox ) worldZHalfLength = worldBox->
GetZHalfLength
();
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else
{
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G4cerr
<<
"World volume of box not found."
<<
G4endl
;
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G4cerr
<<
"Perhaps you have changed geometry."
<<
G4endl
;
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G4cerr
<<
"The gun will be place in the center."
<<
G4endl
;
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}
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// Note that this particular case of starting a primary particle on the world boundary
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// requires shooting in a direction towards inside the world.
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fParticleGun
->
SetParticlePosition
(
G4ThreeVector
(0., 0., -worldZHalfLength));
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fParticleGun
->
GeneratePrimaryVertex
(anEvent);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
geant4
tree
geant4-10.6-release
examples
basic
B2
B2a
src
B2PrimaryGeneratorAction.cc
Built by
Jin Huang
. updated:
Wed Jun 29 2022 17:25:01
using
1.8.2 with
ECCE GitHub integration