Generation of a Primary event

Giada Petringa (LNS-INFN)

The 2nd Geant4 School in China Shandong University

Qingdao

1

User Classes 2

At initialization At execution

G4VUserDetectorConstruction

G4VUserActionInitialization

G4UserSteppingAction

G4VUserPhysicsList G4UserRunAction

G4UserTrackingAction

G4UserStackingAction

G4UserEventAction

G4VUserPrimaryGeneratorAction

Global: only one instance exists in memory, shared by all threads.

Thread-local: an instance of each action class exists for each thread.

2

The Primary is a mandatory action class 3

G4VUserPrimaryGeneratorAction 4

…its concrete implementation 5

…its concrete implementation 6

G4VPrimaryGenerator 7

G4HEPEvInterface 8

G4ParticleGun() 9

G4ParticleGun() 10

G4GeneralParticleSource() 11

G4GeneralParticleSource() 12

G4GeneralParticleSource() 13

ParticleGun Vs GPS 14

Examples 15

example/extended/…..

GPS /eventgenerator/exgps

HEPEvInterface/runAndEvent/RE02/srcRE01PrimaryGeneratorAction.cc

Next task 16

Exercise 2b.1: Instantiate the GeneralParticleSource

Exercise 2b.2: Changing GPS parameter from macro commands

Exercise 2b.3: Creating a complicated GPS source with macro commands

Next task 17

Exercise 2a.2: Change parameters of the particle gun

Exercise 2a.1: Instantiate and customize the Particle Gun

18

…It’s all!