include/Geant4/G4SynchrotronRadiation.hh

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0024 // ********************************************************************
0025 //
0026 // ------------------------------------------------------------
0027 //      GEANT 4 class header file
0028 //
0029 //      History:
0030 //      21-5-98  1 version , V. Grichine
0031 //      28-05-01, V.Ivanchenko minor changes to provide ANSI -wall compilation
0032 //      23-05-06, H. Burkhardt: Energy spectrum from function rather than table
0033 //
0034 // ------------------------------------------------------------
0035
0036 #ifndef G4SynchrotronRadiation_h
0037 #define G4SynchrotronRadiation_h 1
0038
0039 #include "globals.hh"
0040 #include "G4Step.hh"
0041 #include "G4ThreeVector.hh"
0042 #include "G4Track.hh"
0043 #include "G4VDiscreteProcess.hh"
0044
0045 class G4LossTableManager;
0046 class G4ParticleDefinition;
0047 class G4PropagatorInField;
0048 class G4VEmAngularDistribution;
0049
0050 class G4SynchrotronRadiation : public G4VDiscreteProcess
0051 {
0052  public:
0053   explicit G4SynchrotronRadiation(const G4String& pName = "SynRad",
0054                                   G4ProcessType type    = fElectromagnetic);
0055
0056   virtual ~G4SynchrotronRadiation();
0057
0058   G4SynchrotronRadiation& operator=(const G4SynchrotronRadiation& right) =
0059     delete;
0060   G4SynchrotronRadiation(const G4SynchrotronRadiation&) = delete;
0061
0062   virtual G4double GetMeanFreePath(const G4Track& track,
0063                                    G4double previousStepSize,
0064                                    G4ForceCondition* condition) override;
0065
0066   virtual G4VParticleChange* PostStepDoIt(const G4Track& track,
0067                                           const G4Step& Step) override;
0068
0069   G4double GetPhotonEnergy(const G4Track& trackData, const G4Step& stepData);
0070
0071   G4double GetRandomEnergySR(G4double, G4double, G4double);
0072
0073   G4double InvSynFracInt(G4double x);
0074   G4double Chebyshev(G4double a, G4double b, const G4double c[], G4int n,
0075                      G4double x);
0076
0077   virtual G4bool IsApplicable(const G4ParticleDefinition&) override;
0078   virtual void BuildPhysicsTable(const G4ParticleDefinition&) override;
0079
0080   void ProcessDescription(std::ostream&) const override;
0081   void DumpInfo() const override { ProcessDescription(G4cout); };
0082
0083   void SetAngularGenerator(G4VEmAngularDistribution* p);
0084
0085  private:
0086   G4LossTableManager* theManager;
0087   G4VEmAngularDistribution* genAngle;
0088   G4ParticleDefinition* theGamma;
0089   G4PropagatorInField* fFieldPropagator;
0090
0091   G4bool FirstTime;
0092   G4bool FirstTime1;
0093
0094   G4int secID = -1;  // creator modelID
0095 };
0096
0097 //////////////////////////  INLINE METHODS  /////////////////////////////
0098
0099 inline G4double G4SynchrotronRadiation::Chebyshev(G4double a, G4double b,
0100                                                   const G4double c[], G4int n,
0101                                                   G4double x)
0102 {
0103   G4double y;
0104   G4double y2 = 2.0 * (y = (2.0 * x - a - b) / (b - a));  // Change of variable.
0105   G4double d = 0., dd = 0.;
0106   for(G4int j = n - 1; j >= 1; --j)  // Clenshaw's recurrence.
0107   {
0108     G4double sv = d;
0109     d           = y2 * d - dd + c[j];
0110     dd          = sv;
0111   }
0112   return y * d - dd + 0.5 * c[0];
0113 }
0114
0115 #endif  // end of G4SynchrotronRadiation.hh