| Geant4 Cross Reference |
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25 //
26 //
27
28 #ifndef G4Channeling_h
29 #define G4Channeling_h 1
30
31 #include "G4ios.hh"
32 #include "globals.hh"
33 #include "G4VDiscreteProcess.hh"
34 #include "G4ChannelingMaterialData.hh"
35 #include "G4ExtendedMaterial.hh"
36 #include "G4LogicalCrystalVolume.hh"
37
38 class G4ChannelingTrackData;
39
40 class G4Channeling : public G4VDiscreteProcess
41 {
42 public:
43
44 G4Channeling();
45 virtual ~G4Channeling();
46 virtual G4VParticleChange* PostStepDoIt(const G4Track&,
47 const G4Step&);
48 virtual G4bool IsApplicable(const G4ParticleDefinition& aPD){
49 return(aPD.GetPDGCharge() != 0.);
50 };
51 virtual void BuildPhysicsTable(const G4ParticleDefinition&){;};
52
53 protected:
54 virtual G4double GetMeanFreePath(const G4Track&,
55 G4double,
56 G4ForceCondition*);
57
58 private:
59 G4ParticleDefinition* GetParticleDefinition(const G4Track& aTrack){
60 return const_cast<G4ParticleDefinition*>(aTrack.GetParticleDefinition());
61 }
62 private:
63 G4StepPoint* GetPre(const G4Track& aTrack){return aTrack.GetStep()->GetPreStepPoint();}
64 G4StepPoint* GetPost(const G4Track& aTrack){return aTrack.GetStep()->GetPostStepPoint();}
65
66
67 private:
68 G4ChannelingMaterialData* GetMatData(const G4Track& aTrack){
69 G4LogicalVolume* aLV = aTrack.GetVolume()->GetLogicalVolume();
70 if(aLV->IsExtended() == true){
71 G4ExtendedMaterial* aEM = (G4ExtendedMaterial*) aTrack.GetVolume()->GetLogicalVolume()->GetMaterial();
72 return (G4ChannelingMaterialData*) aEM->RetrieveExtension("channeling");
73 }
74 else{
75 return nullptr;
76 }
77 }
78
79 //----------------------------------------
80 // Functions for the calculations of
81 // parameters related to channeling
82 //----------------------------------------
83 public:
84 G4double GetCriticalAngle(const G4Track& aTrack){
85 return std::sqrt(2.0*GetMatData(aTrack)->GetPot()->GetMaxMin()
86 /GetPre(aTrack)->GetTotalEnergy());}
87 G4double GetOscillationPeriod(const G4Track& aTrack){
88 return (CLHEP::pi * GetMatData(aTrack)->GetPot()->GetIntSp(0)
89 / GetCriticalAngle(aTrack));
90 }
91 //----------------------------------------
92 // Channeling Auxiliary Track Information
93 //----------------------------------------
94 private:
95 G4int fChannelingID;
96 G4ChannelingTrackData* GetTrackData(const G4Track&);
97
98 //----------------------------------------
99 // Variables for the integration
100 // of the particle trajectory
101 //----------------------------------------
102 private:
103 G4bool UpdateIntegrationStep(const G4Track&,
104 G4ThreeVector&,
105 G4double&);
106 G4bool UpdateParameters(const G4Track&);
107
108 void GetEF(const G4Track&,G4ThreeVector&,G4ThreeVector&);
109
110 public:
111 void PosToLattice(G4StepPoint* step,G4ThreeVector&);
112
113 public:
114 G4double GetTransverseVariationMax() {return fTransverseVariationMax;};
115 void SetTransverseVariationMax(G4double aDouble) {fTransverseVariationMax = aDouble;};
116
117 G4double GetTimeStepMin() {return fTimeStepMin;};
118 void SetTimeStepMin(G4double aDouble) {fTimeStepMin = aDouble;};
119
120 private:
121 G4double fTimeStepMin;
122 G4double fTimeStepMax;
123
124 G4double fTransverseVariationMax;
125
126 const G4ThreeVector k010;
127 G4ThreeVector fSpin;
128 };
129
130 #endif
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