exampleB01.cc

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// $Id$
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// 
// --------------------------------------------------------------
//      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.
// The G4Scorer is used for the scoring. This is a top level
// class using the frame work provided for scoring.
// 

// --------------------------------------------------------------

#include <iostream>

#include "G4VPhysicalVolume.hh"
#include "G4RunManager.hh"
#include "G4UImanager.hh"
#include "G4GeometryManager.hh"

// user classes
#include "B01DetectorConstruction.hh"
#include "B01PhysicsList.hh"
#include "B01PrimaryGeneratorAction.hh"
#include "B01RunAction.hh"
#include "B01ScoreTable.hh"

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


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

  G4int numberOfEvents = 100;
  G4long myseed = 345354;
  CLHEP::HepRandom::setTheSeed(myseed);

  G4RunManager *runManager = new G4RunManager;
  
  // create the detector      ---------------------------
  B01DetectorConstruction *detector = new B01DetectorConstruction();
  runManager->SetUserInitialization(detector);
  //  ---------------------------------------------------
  runManager->SetUserInitialization(new B01PhysicsList);
  runManager->SetUserAction(new B01PrimaryGeneratorAction);
  runManager->SetUserAction(new B01RunAction);
  runManager->Initialize();

  // pointers for importance store, weight-window store
  // and weight-window algorithm
  //
  G4VIStore *aIstore = 0;
  G4VWeightWindowStore *aWWstore = 0;
  G4VWeightWindowAlgorithm *wwAlg = 0;

  // create sampler for biasing and scoring in the mass geometry
  //
  G4GeometrySampler mgs(detector->GetWorldVolume(),"neutron");
  mgs.SetParallel(false);

  if (mode == 0)
  { 
    // prepare for importance sampling
    //
    aIstore = detector->CreateImportanceStore();
    mgs.PrepareImportanceSampling(aIstore, 0);
  }
  else
  {
    // prepare for weight window technique
    // in this case the algoritm is initialized such that
    // the weight window tehcnique does exactly the same as
    // the importance sampling technique, therefore
    // the place of action ( the locations where 
    // splitting and Russian roulette are to be applied)
    // is chosen to be on the boundary between cells.
    //
    aWWstore = detector->CreateWeightWindowStore();

    wwAlg = new G4WeightWindowAlgorithm(1,    // upper limit factor
                                        1,    // survival factor 
                                        100); // max. number of splitting
      
    mgs.PrepareWeightWindow(aWWstore, wwAlg, onBoundary);  // place of action
  }
  mgs.Configure();

  runManager->BeamOn(numberOfEvents);

  // print a table of the scores
  //
  B01ScoreTable sp(aIstore); //ASO

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

  if (aIstore) {
    delete aIstore;
  }
  if (aWWstore) {
    delete aWWstore;
  }
  if (wwAlg) {
    delete wwAlg;
  }

  mgs.ClearSampling();

  delete runManager;

  return 0;
}