geant4/examples/extended/biasing/B01/exampleB01.cc

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/// \file exampleB01.cc
/// \brief Main program of the biasing/B01 example

// --------------------------------------------------------------
//      GEANT 4 - exampleB01
//
// --------------------------------------------------------------
// Comments
//
// This example intends to show how to use importance sampling and scoring
// in the mass (tracking) geometry.
// A simple geometry consisting of a 180 cm high concrete cylinder
// divided into 18 slabs of 10cm each is created.
// Importance values are assigned to the 18 concrete slabs in the
// detector construction class for simplicity.
// Pairs of G4GeometryCell and importance values are stored in
// the importance store.
// Scoring is carried out by the multifunctional detector (MFD) and
// sensitive detectors
//
// Alex Howard (alexander.howard@cern.ch):
// 22/11/13: Migrated to the new MT compliant design which moves the
//           biasing process to the physicslist constructor - here
//           via the modular physicslists
//

// --------------------------------------------------------------
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#include "G4GeometryManager.hh"
#include "G4RunManagerFactory.hh"
#include "G4Types.hh"
#include "G4UImanager.hh"
#include "G4VPhysicalVolume.hh"

#include <iostream>
#include <stdlib.h>

// user classes
#include "B01ActionInitialization.hh"
#include "B01DetectorConstruction.hh"
#include "FTFP_BERT.hh"

#include "G4ImportanceBiasing.hh"
#include "G4WeightWindowBiasing.hh"
// #include "B01PrimaryGeneratorAction.hh"
// #include "B01RunAction.hh"

// Files specific for biasing and scoring
#include "G4GeometrySampler.hh"
#include "G4IStore.hh"
#include "G4VWeightWindowStore.hh"
#include "G4WeightWindowAlgorithm.hh"

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int main(int argc, char** argv)
{
  G4int mode = 0;
  if (argc > 1) mode = atoi(argv[1]);

  G4int numberOfEvents = 100;
  G4long myseed = 345354;

  auto* runManager = G4RunManagerFactory::CreateRunManager();
  runManager->SetNumberOfThreads(2);

  G4Random::setTheSeed(myseed);

  G4VWeightWindowAlgorithm* wwAlg = 0;  // pointer for WeightWindow (mode>0)

  // create the detector      ---------------------------
  B01DetectorConstruction* detector = new B01DetectorConstruction();
  runManager->SetUserInitialization(detector);
  G4GeometrySampler mgs(detector->GetWorldVolume(), "neutron");

  G4VModularPhysicsList* physicsList = new FTFP_BERT;
  if (mode == 0) {
    physicsList->RegisterPhysics(new G4ImportanceBiasing(&mgs));
  }
  else {
    wwAlg = new G4WeightWindowAlgorithm(1,  // upper limit factor
                                        1,  // survival factor
                                        100);  // max. number of splitting

    physicsList->RegisterPhysics(new G4WeightWindowBiasing(&mgs, wwAlg, onBoundary));
    // place of action
  }
  runManager->SetUserInitialization(physicsList);

  // Set user action classes through Worker Initialization
  //
  B01ActionInitialization* actions = new B01ActionInitialization;
  runManager->SetUserInitialization(actions);

  runManager->Initialize();

  if (mode == 0) {
    detector->CreateImportanceStore();
  }
  else {
    detector->CreateWeightWindowStore();
  }

  //  runManager->BeamOn(numberOfEvents);

  // temporary fix before runManager->BeamOn works...
  G4UImanager* UImanager = G4UImanager::GetUIpointer();
  G4String command1 = "/control/cout/setCoutFile threadOut";
  UImanager->ApplyCommand(command1);
  G4String command2 = "/run/beamOn " + G4UIcommand::ConvertToString(numberOfEvents);
  ;
  UImanager->ApplyCommand(command2);

  // open geometry for clean biasing stores clean-up
  //
  G4GeometryManager::GetInstance()->OpenGeometry();

  if (wwAlg) {
    delete wwAlg;
  }

  // mgs.ClearSampling();

  delete runManager;

  return 0;
}

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