include/Geant4/G4IonFluctuations.hh

0001 //
0002 // ********************************************************************
0003 // * License and Disclaimer                                           *
0004 // *                                                                  *
0005 // * The  Geant4 software  is  copyright of the Copyright Holders  of *
0006 // * the Geant4 Collaboration.  It is provided  under  the terms  and *
0007 // * conditions of the Geant4 Software License,  included in the file *
0008 // * LICENSE and available at  http://cern.ch/geant4/license .  These *
0009 // * include a list of copyright holders.                             *
0010 // *                                                                  *
0011 // * Neither the authors of this software system, nor their employing *
0012 // * institutes,nor the agencies providing financial support for this *
0013 // * work  make  any representation or  warranty, express or implied, *
0014 // * regarding  this  software system or assume any liability for its *
0015 // * use.  Please see the license in the file  LICENSE  and URL above *
0016 // * for the full disclaimer and the limitation of liability.         *
0017 // *                                                                  *
0018 // * This  code  implementation is the result of  the  scientific and *
0019 // * technical work of the GEANT4 collaboration.                      *
0020 // * By using,  copying,  modifying or  distributing the software (or *
0021 // * any work based  on the software)  you  agree  to acknowledge its *
0022 // * use  in  resulting  scientific  publications,  and indicate your *
0023 // * acceptance of all terms of the Geant4 Software license.          *
0024 // ********************************************************************
0025 //
0026 //
0027 // -------------------------------------------------------------------
0028 //
0029 // GEANT4 Class header file
0030 //
0031 //
0032 // File name:     G4IonFluctuations
0033 //
0034 // Author:        Vladimir Ivanchenko
0035 //
0036 // Creation date: 02.04.2003
0037 //
0038 // Modifications:
0039 //
0040 // 16-10-03 Changed interface to Initialisation (V.Ivanchenko)
0041 // 01-06-08 Added initialisation of effective charge prestep (V.Ivanchenko)
0042 //
0043 // Class Description:
0044 //
0045 // Implementation of ion energy loss fluctuations
0046
0047 // -------------------------------------------------------------------
0048 //
0049
0050 #ifndef G4IonFluctuations_h
0051 #define G4IonFluctuations_h 1
0052
0053 #include "G4VEmFluctuationModel.hh"
0054 #include "G4ParticleDefinition.hh"
0055
0056 class G4Pow;
0057 class G4UniversalFluctuation;
0058
0059 class G4IonFluctuations : public G4VEmFluctuationModel
0060 {
0061
0062 public:
0063
0064   explicit G4IonFluctuations(const G4String& nam = "IonFluc");
0065
0066   ~G4IonFluctuations() override;
0067
0068   // Sample fluctuations
0069   G4double SampleFluctuations(const G4MaterialCutsCouple*,
0070                   const G4DynamicParticle*,
0071                   const G4double tcut,
0072                   const G4double tmax,
0073                   const G4double length,
0074                   const G4double meanLoss) override;
0075
0076   // Compute dispertion
0077   G4double Dispersion(const G4Material*,
0078               const G4DynamicParticle*,
0079                       const G4double tcut,
0080               const G4double tmax,
0081               const G4double length) override;
0082
0083   // Initialisation prerun
0084   void InitialiseMe(const G4ParticleDefinition*) override;
0085
0086   // Initialisation prestep
0087   void SetParticleAndCharge(const G4ParticleDefinition*,
0088                 G4double q2) override;
0089
0090   // hide assignment operator
0091   G4IonFluctuations & operator=(const  G4IonFluctuations &right) = delete;
0092   G4IonFluctuations(const  G4IonFluctuations&) = delete;
0093
0094 private:
0095
0096   G4double Factor(const G4Material*, G4double Zeff);
0097   G4double RelativisticFactor(const G4Material*, G4double Zeff);
0098
0099   const G4ParticleDefinition* particle = nullptr;
0100   G4UniversalFluctuation* uniFluct;
0101   G4Pow* g4calc;
0102
0103   G4double particleMass;
0104   G4double charge = 1.0;
0105   G4double chargeSquare = 1.0;
0106   G4double effChargeSquare = 1.0;
0107
0108   // data members to speed up the fluctuation calculation
0109   G4double parameter;
0110   G4double theBohrBeta2;
0111   G4double minFraction = 0.2;
0112   G4double xmin = 0.2;
0113   G4double minLoss;
0114   // cash
0115   G4double kineticEnergy = 0.0;
0116   G4double beta2 = 0.0;
0117 };
0118
0119 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
0120
0121 #endif
0122