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1 // 1 //
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24 // ******************************************* 24 // ********************************************************************
25 // 25 //
>> 26 //
>> 27 //
>> 28 // ---------------------------------------------------------------
>> 29 //
26 // G4ILawForceFreeFlight 30 // G4ILawForceFreeFlight
27 // 31 //
28 // Class Description: 32 // Class Description:
>> 33 // A G4VBiasingInteractionLaw representing the "interaction" law
>> 34 // for a force free flight, ie, a particle which does not interact.
>> 35 // It is a limit case for which the non-interaction probability over
>> 36 // a segment is always 1, and the effective cross-section always
>> 37 // zero.
>> 38 // This singular behavior is signaled by the IsSingular()
>> 39 // method returning always true.
29 // 40 //
30 // A G4VBiasingInteractionLaw representing the << 41 // ---------------------------------------------------------------
31 // for a force free flight, ie, a particle whi << 42 // Initial version Nov. 2013 M. Verderi
32 // It is a limit case for which the non-intera <<
33 // a segment is always 1, and the effective cr <<
34 // zero. This singular behavior is signaled by <<
35 // method returning always true. <<
36 // <<
37 // Author: Marc Verderi, November 2013. <<
38 // ------------------------------------------- <<
39 #ifndef G4ILawForceFreeFlight_hh 43 #ifndef G4ILawForceFreeFlight_hh
40 #define G4ILawForceFreeFlight_hh 1 44 #define G4ILawForceFreeFlight_hh 1
41 45
42 #include "G4VBiasingInteractionLaw.hh" 46 #include "G4VBiasingInteractionLaw.hh"
43 47
44 class G4ILawForceFreeFlight : public G4VBiasin 48 class G4ILawForceFreeFlight : public G4VBiasingInteractionLaw
45 { 49 {
46 public: << 50 public:
47 << 51 G4ILawForceFreeFlight(G4String name = "forceFreeFlightLaw");
48 G4ILawForceFreeFlight(const G4String& name << 52 virtual ~G4ILawForceFreeFlight();
49 virtual ~G4ILawForceFreeFlight(); <<
50 53
51 virtual G4double ComputeEffectiveCrossSect << 54 public:
52 virtual G4double ComputeNonInteractionProb << 55 virtual G4double ComputeEffectiveCrossSectionAt(G4double length) const;
53 << 56 virtual G4double ComputeNonInteractionProbabilityAt(G4double length) const;
54 // -- sample the distribution << 57 // -- sample the distribution
55 virtual G4double SampleInteractionLength( << 58 virtual G4double SampleInteractionLength();
56 // -- move by true path length, this posit << 59 // -- move by true path length, this position becomes the new initial point
57 virtual G4double UpdateInteractionLengthFo << 60 virtual G4double UpdateInteractionLengthForStep(G4double truePathLength);
58 virtual G4bool IsSingular() const { return << 61 virtual G4bool IsSingular() const {return true;}
59 }; 62 };
60 63
61 #endif 64 #endif
62 65