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BiasingOperation.cc
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30 
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33 
34 #include "BiasingOperation.hh"
35 #include "G4BiasingProcessInterface.hh"
36 #include "G4VParticleChange.hh"
37 #include "G4ProtonInelasticProcess.hh"
38 #include "G4NeutronInelasticProcess.hh"
39 #include "G4PionPlusInelasticProcess.hh"
40 #include "G4PionMinusInelasticProcess.hh"
41 #include "G4HadronicParameters.hh"
42 #include "G4FTFModel.hh"
43 #include "G4LundStringFragmentation.hh"
44 #include "G4ExcitedStringDecay.hh"
45 #include "G4GeneratorPrecompoundInterface.hh"
46 #include "G4TheoFSGenerator.hh"
47 #include "G4HadronicInteractionRegistry.hh"
48 #include "G4VPreCompoundModel.hh"
49 #include "G4INCLXXInterface.hh"
50 #include "G4HadronInelasticDataSet.hh"
51 
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53 
54 BiasingOperation::BiasingOperation( G4String name ) : G4VBiasingOperation( name ) {
55 
56  // Create the inelastic processes for p , n , pi+ , pi-
57  fProtonInelasticProcess = new G4ProtonInelasticProcess;
58  fNeutronInelasticProcess = new G4NeutronInelasticProcess;
59  fPionPlusInelasticProcess = new G4PionPlusInelasticProcess;
60  fPionMinusInelasticProcess = new G4PionMinusInelasticProcess;
61 
62  // Set the energy ranges
63  const G4double minPreco = 0.0;
64  const G4double maxPreco = 2.0 * CLHEP::MeV;
65  const G4double maxBERT = 12.0 * CLHEP::GeV;
66  const G4double minINCLXX = 1.0 * CLHEP::MeV;
67  const G4double minFTFP = 3.0 * CLHEP::GeV;
68  const G4double maxFTFP = G4HadronicParameters::Instance()->GetMaxEnergy();
69 
70  // Create the hadronic models (to replace FTFP_BERT with "FTFP_INCLXX",
71  // keeping the same energy ranges for the transition between models).
72  // Notice that it is better to create the models here from scratch,
73  // instead of reusing the existing ones, because we might pick up the
74  // existing ones associated to the wrong particles...
75  // --- FTFP model ---
76  G4FTFModel* theStringModel = new G4FTFModel;
77  G4LundStringFragmentation* theLund = new G4LundStringFragmentation;
78  G4ExcitedStringDecay* theStringDecay = new G4ExcitedStringDecay( theLund );
79  theStringModel->SetFragmentationModel( theStringDecay );
80  G4GeneratorPrecompoundInterface* thePrecoInterface = new G4GeneratorPrecompoundInterface;
81  G4TheoFSGenerator* theHighEnergyModel = new G4TheoFSGenerator( "FTFP" );
82  theHighEnergyModel->SetHighEnergyGenerator( theStringModel );
83  theHighEnergyModel->SetTransport( thePrecoInterface );
84  theHighEnergyModel->SetMinEnergy( minFTFP );
85  theHighEnergyModel->SetMaxEnergy( maxFTFP );
86  // Preco : create a new model to be used only for INCLXX for nucleons
87  G4VPreCompoundModel* thePreCompoundModel = new G4PreCompoundModel;
88  thePreCompoundModel->SetMinEnergy( minPreco );
89  thePreCompoundModel->SetMaxEnergy( maxPreco );
90  // --- Preco ---
91  // --- INCLXX model ---
92  // The instance for nucleons:
93  G4INCLXXInterface* theInclxxModel = new G4INCLXXInterface( thePreCompoundModel );
94  theInclxxModel->SetMinEnergy( minINCLXX );
95  theInclxxModel->SetMaxEnergy( maxBERT ); // Use the same as for Bertini
96  // The instance for pions:
97  G4INCLXXInterface* theInclxxModel_forPions = new G4INCLXXInterface;
98  theInclxxModel_forPions->SetMinEnergy( minPreco );
99  theInclxxModel_forPions->SetMaxEnergy( maxBERT ); // Use the same as for Bertini
100 
101  // Register the models
102  fProtonInelasticProcess->RegisterMe( theHighEnergyModel );
103  fProtonInelasticProcess->RegisterMe( theInclxxModel );
104  fProtonInelasticProcess->RegisterMe( thePreCompoundModel );
105  fNeutronInelasticProcess->RegisterMe( theHighEnergyModel );
106  fNeutronInelasticProcess->RegisterMe( theInclxxModel );
107  fNeutronInelasticProcess->RegisterMe( thePreCompoundModel );
108  fPionPlusInelasticProcess->RegisterMe( theHighEnergyModel );
109  fPionPlusInelasticProcess->RegisterMe( theInclxxModel_forPions );
110  fPionMinusInelasticProcess->RegisterMe( theHighEnergyModel );
111  fPionMinusInelasticProcess->RegisterMe( theInclxxModel_forPions );
112 
113  // Register the cross sections: this is mandatory starting from G4 10.6
114  // because the default Gheisha inelastic cross sections have been removed.
115  // It is convenient to use the Gheisha inelastic cross sections here
116  // because they do not require any special initialization.
117  fProtonInelasticProcess->AddDataSet( new G4HadronInelasticDataSet );
118  fNeutronInelasticProcess->AddDataSet( new G4HadronInelasticDataSet );
119  fPionPlusInelasticProcess->AddDataSet( new G4HadronInelasticDataSet );
120  fPionMinusInelasticProcess->AddDataSet( new G4HadronInelasticDataSet );
121 }
122 
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125 BiasingOperation::~BiasingOperation() {}
126 
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128 
129 G4VParticleChange* BiasingOperation::
130 ApplyFinalStateBiasing( const G4BiasingProcessInterface* ,
131  const G4Track* track, const G4Step* step, G4bool& ) {
132  if ( track->GetParticleDefinition() == G4Proton::Definition() ) {
133  return fProtonInelasticProcess->PostStepDoIt( *track, *step );
134  } else if ( track->GetParticleDefinition() == G4Neutron::Definition() ) {
135  return fNeutronInelasticProcess->PostStepDoIt( *track, *step );
136  } else if ( track->GetParticleDefinition() == G4PionPlus::Definition() ) {
137  return fPionPlusInelasticProcess->PostStepDoIt( *track, *step );
138  } else if ( track->GetParticleDefinition() == G4PionMinus::Definition() ) {
139  return fPionMinusInelasticProcess->PostStepDoIt( *track, *step );
140  } else {
141  G4cerr << "ERROR in BiasingOperation::ApplyFinalStateBiasing : unexpected particle = "
142  << track->GetParticleDefinition()->GetParticleName() << G4endl;
143  return 0;
144  }
145 }
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