include/Geant4/G4BOptnChangeCrossSection.hh

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0025 //
0026 //
0027 //
0028 //---------------------------------------------------------------
0029 //
0030 // G4BOptnChangeCrossSection
0031 //
0032 // Class Description:
0033 //    A G4VBiasingOperation to change a process cross-section.
0034 //
0035 //
0036 //---------------------------------------------------------------
0037 //   Initial version                         Nov. 2013 M. Verderi
0038
0039
0040 #ifndef G4BOptnChangeCrossSection_hh
0041 #define G4BOptnChangeCrossSection_hh 1
0042
0043 #include "G4VBiasingOperation.hh"
0044 class G4InteractionLawPhysical;
0045
0046 class G4BOptnChangeCrossSection : public G4VBiasingOperation {
0047 public:
0048   // -- Constructor :
0049   G4BOptnChangeCrossSection(G4String name);
0050   // -- destructor:
0051   virtual ~G4BOptnChangeCrossSection();
0052
0053 public:
0054   // -- Methods from G4VBiasingOperation interface:
0055   // ----------------------------------------------
0056   // -- Used:
0057   virtual const G4VBiasingInteractionLaw* ProvideOccurenceBiasingInteractionLaw( const G4BiasingProcessInterface*,
0058                                          G4ForceCondition& proposeForceCondition );
0059
0060   // -- Unused:
0061   virtual G4VParticleChange*   ApplyFinalStateBiasing( const G4BiasingProcessInterface*,
0062                                const G4Track*,
0063                                const G4Step*,
0064                                G4bool&          )  {return 0;}
0065   virtual G4double           DistanceToApplyOperation( const G4Track*,
0066                                G4double,
0067                                G4ForceCondition*)  {return DBL_MAX;}
0068   virtual G4VParticleChange* GenerateBiasingFinalState( const G4Track*,
0069                                 const G4Step*   )  {return 0;}
0070
0071 public:
0072   // -- Additional methods, specific to this class:
0073   // ----------------------------------------------
0074   // -- return concrete type of interaction law:
0075   G4InteractionLawPhysical* GetBiasedExponentialLaw() {return fBiasedExponentialLaw;}
0076   // -- set biased cross-section:
0077   void     SetBiasedCrossSection(G4double xst, bool updateInteractionLength = false);
0078   G4double GetBiasedCrossSection() const;
0079   // -- Sample underneath distribution:
0080   void Sample();
0081   // -- Update for a made step, without resampling:
0082   void UpdateForStep( G4double stepLength );
0083   // -- set/get if interaction occured.
0084   // -- Interaction flag turned off in "Sample()" method.
0085   G4bool GetInteractionOccured() const { return fInteractionOccured; }
0086   void   SetInteractionOccured() { fInteractionOccured = true; }
0087
0088
0089
0090 private:
0091   G4InteractionLawPhysical* fBiasedExponentialLaw;
0092   G4bool                      fInteractionOccured;
0093 };
0094
0095 #endif