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G4PolarizedCompton.hh
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26 // -------------------------------------------------------------------
27 //
28 // GEANT4 Class header file
29 //
30 //
31 // File name: G4PolarizedCompton
32 //
33 // Author: Andreas Schaelicke
34 // based on code by Michel Maire / Vladimir IVANTCHENKO
35 // Class description
36 //
37 // modified version respecting media and beam polarization
38 // using the stokes formalism
39 //
40 // Creation date: 01.05.2005
41 //
42 // Modifications:
43 //
44 // 01-01-05, include polarization description (A.Stahl)
45 // 01-01-05, create asymmetry table and determine interactionlength (A.Stahl)
46 // 01-05-05, update handling of media polarization (A.Schalicke)
47 // 01-05-05, update polarized differential cross section (A.Schalicke)
48 // 26-07-06, cross section recalculated (P.Starovoitov)
49 // 09-08-06, make it work under current geant4 release (A.Schalicke)
50 // 11-06-07, add PostStepGetPhysicalInteractionLength (A.Schalicke)
51 //
52 // -----------------------------------------------------------------------------
53 
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56 
57 #ifndef PolarizedComptonScattering_h
58 #define PolarizedComptonScattering_h 1
59 
60 #include "globals.hh"
61 #include "G4VEmProcess.hh"
62 #include "G4Gamma.hh"
63 
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65 
67 class G4VEmModel;
69 class G4DynamicParticle;
70 
72 
74 
75 {
76 public: // with description
77 
78  G4PolarizedCompton(const G4String& processName ="pol-compt",
80 
81  virtual ~G4PolarizedCompton();
82 
83  // true for Gamma only.
85 
86  // Print few lines of informations about the process: validity range,
87  virtual void PrintInfo();
88 
89  void SetModel(const G4String& name);
90 
91 protected:
92 
93  virtual void InitialiseProcess(const G4ParticleDefinition*);
94 
95  // added for polarization treatment of polarized media:
96  virtual void BuildPhysicsTable(const G4ParticleDefinition&);
97  virtual void PreparePhysicsTable(const G4ParticleDefinition&);
100  const G4MaterialCutsCouple* couple,
101  const G4ParticleDefinition& particle,
102  G4double cut,
103  G4double & tAsymmetry);
104 
105  virtual G4double GetMeanFreePath(const G4Track& aTrack,
106  G4double previousStepSize,
109  const G4Track& track,
110  G4double previousStepSize,
111  G4ForceCondition* condition
112  );
113 
114  // can be removed as soon as G4PolarizationChangeForGamma is fixed!
115  // virtual G4VParticleChange* PostStepDoIt(const G4Track&, const G4Step&);
116 
117 private:
118 
119  G4PolarizedCompton& operator=(const G4PolarizedCompton &right);
121 
122  G4bool buildAsymmetryTable;
123  G4bool useAsymmetryTable;
124 
125  G4bool isInitialised;
126  G4VEmModel* selectedModel;
127  G4int mType;
128 
129  // added for polarization treatment:
130  G4PolarizedComptonModel* emModel;
131  G4PhysicsTable* theAsymmetryTable; // table for crosssection assymmetry
132  G4ThreeVector targetPolarization;
133 };
134 
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137 
139 {
140  return (&p == G4Gamma::Gamma());
141 }
142 
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144 
145 #endif
146