00001 // 00002 // ******************************************************************** 00003 // * License and Disclaimer * 00004 // * * 00005 // * The Geant4 software is copyright of the Copyright Holders of * 00006 // * the Geant4 Collaboration. It is provided under the terms and * 00007 // * conditions of the Geant4 Software License, included in the file * 00008 // * LICENSE and available at http://cern.ch/geant4/license . These * 00009 // * include a list of copyright holders. * 00010 // * * 00011 // * Neither the authors of this software system, nor their employing * 00012 // * institutes,nor the agencies providing financial support for this * 00013 // * work make any representation or warranty, express or implied, * 00014 // * regarding this software system or assume any liability for its * 00015 // * use. Please see the license in the file LICENSE and URL above * 00016 // * for the full disclaimer and the limitation of liability. * 00017 // * * 00018 // * This code implementation is the result of the scientific and * 00019 // * technical work of the GEANT4 collaboration. * 00020 // * By using, copying, modifying or distributing the software (or * 00021 // * any work based on the software) you agree to acknowledge its * 00022 // * use in resulting scientific publications, and indicate your * 00023 // * acceptance of all terms of the Geant4 Software license. * 00024 // ******************************************************************** 00025 // 00026 // $Id$ 00027 // 00028 // ------------------------------------------------------------------- 00029 // 00030 // GEANT4 Class header file 00031 // 00032 // 00033 // File name: G4IonFluctuations 00034 // 00035 // Author: Vladimir Ivanchenko 00036 // 00037 // Creation date: 02.04.2003 00038 // 00039 // Modifications: 00040 // 00041 // 16-10-03 Changed interface to Initialisation (V.Ivanchenko) 00042 // 01-06-08 Added initialisation of effective charge prestep (V.Ivanchenko) 00043 // 00044 // Class Description: 00045 // 00046 // Implementation of ion energy loss fluctuations 00047 00048 // ------------------------------------------------------------------- 00049 // 00050 00051 #ifndef G4IonFluctuations_h 00052 #define G4IonFluctuations_h 1 00053 00054 00055 #include "G4VEmFluctuationModel.hh" 00056 #include "G4ParticleDefinition.hh" 00057 #include "G4UniversalFluctuation.hh" 00058 00059 class G4IonFluctuations : public G4VEmFluctuationModel 00060 { 00061 00062 public: 00063 00064 G4IonFluctuations(const G4String& nam = "IonFluc"); 00065 00066 virtual ~G4IonFluctuations(); 00067 00068 // Sample fluctuations 00069 G4double SampleFluctuations(const G4Material*, 00070 const G4DynamicParticle*, 00071 G4double& tmax, 00072 G4double& length, 00073 G4double& meanLoss); 00074 00075 // Compute dispertion 00076 G4double Dispersion(const G4Material*, 00077 const G4DynamicParticle*, 00078 G4double& tmax, 00079 G4double& length); 00080 00081 // Initialisation prerun 00082 void InitialiseMe(const G4ParticleDefinition*); 00083 00084 // Initialisation prestep 00085 void SetParticleAndCharge(const G4ParticleDefinition*, G4double q2); 00086 00087 private: 00088 00089 G4double Factor(const G4Material*, G4double Zeff); 00090 G4double RelativisticFactor(const G4Material*, G4double Zeff); 00091 00092 // hide assignment operator 00093 G4IonFluctuations & operator=(const G4IonFluctuations &right); 00094 G4IonFluctuations(const G4IonFluctuations&); 00095 00096 G4UniversalFluctuation uniFluct; 00097 const G4ParticleDefinition* particle; 00098 00099 G4double particleMass; 00100 G4double charge; 00101 G4double chargeSquare; 00102 G4double effChargeSquare; 00103 00104 // data members to speed up the fluctuation calculation 00105 G4double parameter; 00106 G4double minNumberInteractionsBohr; 00107 G4double theBohrBeta2; 00108 G4double minFraction; 00109 G4double xmin; 00110 G4double minLoss; 00111 // cash 00112 G4double kineticEnergy; 00113 G4double beta2; 00114 }; 00115 00116 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... 00117 00118 #endif 00119