source: trunk/source/processes/electromagnetic/standard/include/G4BraggModel.hh@ 1036

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// $Id: G4BraggModel.hh,v 1.12 2008/09/14 17:11:48 vnivanch Exp $
// GEANT4 tag $Name: geant4-09-02 $
//
// -------------------------------------------------------------------
//
// GEANT4 Class header file
//
//
// File name:     G4BraggModel
//
// Author:        Vladimir Ivanchenko
//
// Creation date: 03.01.2002
//
// Modifications:
// 23-12-02 V.Ivanchenko change interface in order to moveto cut per region
// 24-01-03 Make models region aware (V.Ivanchenko)
// 13-02-03 Add name (V.Ivanchenko)
// 12-11-03 Fix for GenericIons (V.Ivanchenko)
// 11-04-05 Major optimisation of internal interfaces (V.Ivantchenko)
// 15-02-06 ComputeCrossSectionPerElectron, ComputeCrossSectionPerAtom (mma)
// 25-04-06 Added stopping data from PSTAR (V.Ivanchenko)
// 12-08-08 Added methods GetParticleCharge, GetChargeSquareRatio, 
//          CorrectionsAlongStep needed for ions(V.Ivanchenko)

//
// Class Description:
//
// Implementation of energy loss and delta-electron production
// by heavy slow charged particles using ICRU'49 and NIST evaluated data 
// for protons

// -------------------------------------------------------------------
//

#ifndef G4BraggModel_h
#define G4BraggModel_h 1

#include "G4VEmModel.hh"
#include "G4PSTARStopping.hh"

class G4ParticleChangeForLoss;
class G4EmCorrections;

class G4BraggModel : public G4VEmModel
{

public:

  G4BraggModel(const G4ParticleDefinition* p = 0,
               const G4String& nam = "Bragg");

  virtual ~G4BraggModel();

  virtual void Initialise(const G4ParticleDefinition*, const G4DataVector&);

  G4double MinEnergyCut(const G4ParticleDefinition*,
                        const G4MaterialCutsCouple*);
                        
  virtual G4double ComputeCrossSectionPerElectron(
                                 const G4ParticleDefinition*,
                                 G4double kineticEnergy,
                                 G4double cutEnergy,
                                 G4double maxEnergy);
                                 
  virtual G4double ComputeCrossSectionPerAtom(
                                 const G4ParticleDefinition*,
                                 G4double kineticEnergy,
                                 G4double Z, G4double A,
                                 G4double cutEnergy,
                                 G4double maxEnergy);
                                                                 
  virtual G4double CrossSectionPerVolume(const G4Material*,
                                 const G4ParticleDefinition*,
                                 G4double kineticEnergy,
                                 G4double cutEnergy,
                                 G4double maxEnergy);
                                 
  virtual G4double ComputeDEDXPerVolume(const G4Material*,
                                const G4ParticleDefinition*,
                                G4double kineticEnergy,
                                G4double cutEnergy);

  virtual void SampleSecondaries(std::vector<G4DynamicParticle*>*,
                                 const G4MaterialCutsCouple*,
                                 const G4DynamicParticle*,
                                 G4double tmin,
                                 G4double maxEnergy);

  // Compute ion charge 
  virtual G4double GetChargeSquareRatio(const G4ParticleDefinition*,
                                        const G4Material*,
                                        G4double kineticEnergy);

  virtual G4double GetParticleCharge(const G4ParticleDefinition* p,
                                     const G4Material* mat,
                                     G4double kineticEnergy);

  // add correction to energy loss and compute non-ionizing energy loss
  virtual void CorrectionsAlongStep(const G4MaterialCutsCouple*,
                                    const G4DynamicParticle*,
                                    G4double& eloss,
                                    G4double& niel,
                                    G4double length);

protected:

  G4double MaxSecondaryEnergy(const G4ParticleDefinition*,
                              G4double kinEnergy);

private:

  void SetParticle(const G4ParticleDefinition* p);

  G4bool HasMaterial(const G4Material* material);

  G4double StoppingPower(const G4Material* material,
                               G4double kineticEnergy);

  G4double ElectronicStoppingPower(G4double z,
                                   G4double kineticEnergy) const;
 
  void SetMoleculaNumber(G4int number) {iMolecula = number;};

  G4double DEDX(const G4Material* material, G4double kineticEnergy);

  G4bool MolecIsInZiegler1988(const G4Material* material);

  G4double ChemicalFactor(G4double kineticEnergy, G4double eloss125) const;

  void SetExpStopPower125(G4double value) {expStopPower125 = value;};

  // hide assignment operator
  G4BraggModel & operator=(const  G4BraggModel &right);
  G4BraggModel(const  G4BraggModel&);


  G4EmCorrections*            corr;

  const G4ParticleDefinition* particle;
  G4ParticleDefinition*       theElectron;
  G4ParticleChangeForLoss*    fParticleChange;
  G4PSTARStopping             pstar;

  G4double mass;
  G4double spin;
  G4double chargeSquare;
  G4double massRate;
  G4double ratio;
  G4double lowestKinEnergy;
  G4double protonMassAMU;
  G4double theZieglerFactor;
  G4double expStopPower125;        // Experimental Stopping power at 125keV

  G4int    iMolecula;          // index in the molecula's table
  G4bool   isIon;
  G4bool   isInitialised;
};

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

inline G4double G4BraggModel::MaxSecondaryEnergy(
                                            const G4ParticleDefinition* pd,
                                                  G4double kinEnergy)
{
  if(pd != particle) SetParticle(pd);
  G4double tau  = kinEnergy/mass;
  G4double tmax = 2.0*electron_mass_c2*tau*(tau + 2.) /
                  (1. + 2.0*(tau + 1.)*ratio + ratio*ratio);
  return tmax;
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

inline void G4BraggModel::SetParticle(const G4ParticleDefinition* p)
{
  particle = p;
  mass = particle->GetPDGMass();
  spin = particle->GetPDGSpin();
  G4double q = particle->GetPDGCharge()/eplus;
  chargeSquare = q*q;
  massRate     = mass/proton_mass_c2;
  ratio = electron_mass_c2/mass;
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

#endif