Simulating different particle gun energies in a single run

Getting Started
7

some inspiration:

void myRunAction::BeginOfRunAction(const G4Run* aRun) {
    G4AnalysisManager* analysisManager = G4AnalysisManager::Instance();
    char fileName[65];
    sprintf(fileName, "Somethingsomething_run%04d",aRun->GetRunID());
    analysisManager->SetFileName(G4String(fileName));
    analysisManager->OpenFile();
}