Header Inclusions

#include "B2RunAction.hh" #include "G4Run.hh" #include "G4RunManager.hh"

These lines include necessary Geant4 headers and the header for this class.

Constructor

B2RunAction::B2RunAction() : G4UserRunAction() { // set printing event number per each 100 events G4RunManager::GetRunManager()->SetPrintProgress(1000);
}

• The constructor initializes the class, inheriting from G4UserRunAction.
• It sets the run manager to print progress every 1000 events using SetPrintProgress(1000).

Destructor

B2RunAction::~B2RunAction() {}

The destructor is empty, indicating no special cleanup is needed.

Begin of Run Action

void B2RunAction::BeginOfRunAction(const G4Run*) { //inform the runManager to save random number seed G4RunManager::GetRunManager()->SetRandomNumberStore(false); }

This method is called at the beginning of each run:

• It sets the run manager to not store random number seeds using SetRandomNumberStore(false).
• This can be useful for reproducibility or debugging, but here it's turned off.

End of Run Action

void B2RunAction::EndOfRunAction(const G4Run* ) {}

This method is called at the end of each run, but it's currently empty. You could add code here to perform actions or analysis at the end of a run.

Key points about this class:

• It manages run-level actions in the Geant4 simulation.