geant4/examples/extended/field/field01/field01.cc

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/// \file field01.cc
/// \brief Main program of the field/field01 example

#include "F01ActionInitialization.hh"
#include "F01DetectorConstruction.hh"
#include "F01RunAction.hh"
#include "F01SteppingVerbose.hh"

#include "G4RunManagerFactory.hh"
#include "G4Types.hh"
#include "G4UImanager.hh"

#include "FTFP_BERT.hh"

#include "G4EmParameters.hh"
#include "G4HadronicParameters.hh"
#include "G4PhysicsListHelper.hh"
#include "G4StepLimiterPhysics.hh"
#include "G4UIExecutive.hh"
#include "G4VisExecutive.hh"
#include "Randomize.hh"

// For Printing statistic from Transporation process(es)
#include "G4CoupledTransportation.hh"
#include "G4Electron.hh"
#include "G4Transportation.hh"
#include "G4TransportationParameters.hh"

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int main(int argc, char** argv)
{
  // Instantiate G4UIExecutive if there are no arguments (interactive mode)
  //
  G4UIExecutive* ui = nullptr;
  if (argc == 1) {
    ui = new G4UIExecutive(argc, argv);
  }

  // Setting the application-specific SteppingVerbose
  //
  auto verbosity = new F01SteppingVerbose;

  // Construct the default run manager
  auto runManager = G4RunManagerFactory::CreateRunManager();

  // G4TransportationWithMscType: fDisabled, fEnabled, fMultipleSteps
  // G4EmParameters::Instance()->SetTransportationWithMsc(G4TransportationWithMscType::fEnabled);

  // Set mandatory initialization classes
  //
  // Detector construction
  auto detector = new F01DetectorConstruction();
  // detector->SetUseFSALstepper();  // Uncomment to use FSAL steppers

  runManager->SetUserInitialization(detector);

  // Configure the use of low thresholds for looping particles
  //  ( appropriate for typical applications using low-energy physics. )
  // auto plHelper = G4PhysicsListHelper::GetPhysicsListHelper();
  // plHelper->UseLowLooperThresholds();
  // plHelper->UseHighLooperThresholds();
  // Request a set of pre-selected values of the parameters for looping
  //    particles:
  //       - High for collider HEP applications,
  //       - Low  for 'low-E' applications, medical, ..
  // Note: If helper is used select low or high thresholds , it will overwrite
  //       values from TransportationParameters!

  // They are currently applied in the following order:
  // 1. Transportation Parameters - fine grained control in Transportation construction
  // 2. Physics List Helper       - impose a fixed set of new values in Transport classes
  // 3. Run Action (F01RunAction) - revise values at Start of Run
  // 4. Tracking Action           - could revise value at start of each track (not shown)
  //     Note that this also could customise by particle type, e.g. giving different values
  //     to mu-/mu+ , e-/e+ vs others)
  // If multiple are present, later methods overwrite previous ones in this list.

  // Physics list
  G4VModularPhysicsList* physicsList = new FTFP_BERT;
  physicsList->RegisterPhysics(new G4StepLimiterPhysics());
  runManager->SetUserInitialization(physicsList);

  // User action initialization
  runManager->SetUserInitialization(new F01ActionInitialization(detector));

  G4double warningE = 10.0 * CLHEP::keV;
  G4double importantE = 0.1 * CLHEP::MeV;
  G4int numTrials = 30;

  G4bool useTransportParams = true;  // Use the new way - Nov 2022

  if (useTransportParams) {
    auto transportParams = G4TransportationParameters::Instance();
    transportParams->SetWarningEnergy(warningE);
    transportParams->SetImportantEnergy(importantE);
    transportParams->SetNumberOfTrials(numTrials);
    G4cout << "field01: Using G4TransportationParameters to set looper parameters." << G4endl;
  }
  else {
    // Fine grained control of thresholds for looping particles
    auto runAction = new F01RunAction();
    runAction->SetWarningEnergy(warningE);
    // Looping particles with E < 10 keV will be killed after 1 step
    //   with warning.
    // Looping particles with E > 10 keV will generate a warning.
    runAction->SetImportantEnergy(importantE);
    runAction->SetNumberOfTrials(numTrials);
    // Looping particles with E > 0.1 MeV will survive for up to
    //  30 'tracking' steps, and only be killed if they still loop.

    G4cout << "field01: Using F01RunAction to set looper parameters." << G4endl;
    runManager->SetUserAction(runAction);
  }

  // Note: this mechanism overwrites the thresholds established by
  //       the call to UseLowLooperThresholds() above.

  // Suppress large verbosity from EM & hadronic processes
  G4EmParameters::Instance()->SetVerbose(0);
  G4HadronicParameters::Instance()->SetVerboseLevel(0);

  // Initialize G4 kernel
  //
  runManager->Initialize();

  // Initialize visualization
  //
  // G4VisExecutive can take a verbosity argument - see /vis/verbose
  G4VisManager* visManager = new G4VisExecutive("Quiet");
  visManager->Initialize();

  // Get the pointer to the User Interface manager
  //
  G4UImanager* UImanager = G4UImanager::GetUIpointer();

  if (!ui)  // batch mode
  {
    G4String command = "/control/execute ";
    G4String fileName = argv[1];
    UImanager->ApplyCommand(command + fileName);
  }
  else {  // interactive mode : define UI session
    UImanager->ApplyCommand("/control/execute init_vis.mac");
    if (ui->IsGUI()) UImanager->ApplyCommand("/control/execute gui.mac");
    ui->SessionStart();
    delete ui;
  }

  // Statistics of tracks killed by G4Transportation are currently
  //  printed in the RunAction's EndOfEvent action.
  // ( Eventually a summary could be provided here instead or as well. )

  delete verbosity;
  delete visManager;
  delete runManager;

  return 0;
}

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