G4ionEffectiveCharge.hh

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00025 //
00026 // $Id$
00027 //
00028 // -------------------------------------------------------------------
00029 //
00030 // GEANT4 Class header file
00031 //
00032 //
00033 // File name:     G4ionEffectiveCharge
00034 //
00035 // Author:        Vladimir Ivanchenko
00036 //
00037 // Creation date: 03.07.2004
00038 //
00039 // Modifications:
00040 //
00041 //
00042 // Class Description:
00043 //
00044 // This class manages the simulation of effective charge of ions 
00045 // in the assumption of equilibrium between ion shelss and media.
00046 // J.F.Ziegler and J.M.Manoyan, The stopping of ions in compaunds,
00047 // Nucl. Inst. & Meth. in Phys. Res. B35 (1988) 215-228.
00048 //
00049 
00050 // -------------------------------------------------------------------
00051 //
00052 
00053 #ifndef G4ionEffectiveCharge_h
00054 #define G4ionEffectiveCharge_h 1
00055 
00056 #include "globals.hh"
00057 #include "G4ParticleDefinition.hh"
00058 
00059 class G4Material;
00060 class G4NistManager;
00061 
00062 class G4ionEffectiveCharge 
00063 {
00064 
00065 public:
00066 
00067   G4ionEffectiveCharge();
00068 
00069   virtual ~G4ionEffectiveCharge();
00070 
00071   G4double EffectiveChargeSquareRatio(
00072                            const G4ParticleDefinition* p,
00073                            const G4Material* material,
00074                                  G4double kineticEnergy);
00075 
00076   G4double EffectiveCharge(const G4ParticleDefinition* p,
00077                            const G4Material* material,
00078                                  G4double kineticEnergy);
00079 
00080 private:
00081 
00082   // hide assignment operator
00083   G4ionEffectiveCharge & operator=(const G4ionEffectiveCharge &right);
00084   G4ionEffectiveCharge(const G4ionEffectiveCharge&);
00085 
00086   G4NistManager*              nist;
00087 
00088   const G4ParticleDefinition* lastPart;
00089   const G4Material*           lastMat;
00090   G4double                    lastKinEnergy;
00091 
00092   G4double                    chargeCorrection;
00093   G4double                    effCharge;
00094 
00095   G4double                    energyHighLimit;
00096   G4double                    energyLowLimit;
00097   G4double                    energyBohr;
00098   G4double                    massFactor;
00099   G4double                    minCharge;
00100 };
00101 
00102 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
00103 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
00104 
00105 inline G4double G4ionEffectiveCharge::EffectiveChargeSquareRatio(
00106                            const G4ParticleDefinition* p,
00107                            const G4Material* material,
00108                                  G4double kineticEnergy)
00109 {
00110   G4double charge = effCharge;
00111   if( kineticEnergy != lastKinEnergy || material != lastMat || p != lastPart) {
00112     charge = EffectiveCharge(p,material,kineticEnergy);
00113   }
00114   charge *= chargeCorrection/CLHEP::eplus;
00115 
00116   return charge*charge;
00117 }
00118 
00119 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
00120 
00121 #endif

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