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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 // | G4LowEPPolarizedComptonModel-- Geant4 Monash University | 0029 // | polarised low energy Compton scattering model. | 0030 // | J. M. C. Brown, Monash University, Australia | 0031 // | | 0032 // | | 0033 // ********************************************************************* 0034 // | | 0035 // | The following is a Geant4 class to simulate the process of | 0036 // | bound electron Compton scattering. General code structure is | 0037 // | based on G4LowEnergyCompton.cc and | 0038 // | G4LivermorePolarizedComptonModel.cc. | 0039 // | Algorithms for photon energy, and ejected Compton electron | 0040 // | direction taken from: | 0041 // | | 0042 // | J. M. C. Brown, M. R. Dimmock, J. E. Gillam and D. M. Paganin, | 0043 // | "A low energy bound atomic electron Compton scattering model | 0044 // | for Geant4", NIMB, Vol. 338, 77-88, 2014. | 0045 // | | 0046 // | The author acknowledges the work of the Geant4 collaboration | 0047 // | in developing the following algorithms that have been employed | 0048 // | or adapeted for the present software: | 0049 // | | 0050 // | # sampling of photon scattering angle, | 0051 // | # target element selection in composite materials, | 0052 // | # target shell selection in element, | 0053 // | # and sampling of bound electron momentum from Compton profiles. | 0054 // | | 0055 // ********************************************************************* 0056 // | | 0057 // | History: | 0058 // | -------- | 0059 // | | 0060 // | Jan. 2015 JMCB - 1st Version based on G4LowEPComptonModel | 0061 // | Feb. 2016 JMCB - Geant4 10.2 FPE fix for bug 1676 | 0062 // | Nov. 2016 JMCB - Polarisation tracking fix in collaboration | 0063 // | of Dr. Merlin Reynaard Kole, | 0064 // | University of Geneva | 0065 // | | 0066 // ********************************************************************* 0067 0068 #ifndef G4LowEPPolarizedComptonModel_h 0069 #define G4LowEPPolarizedComptonModel_h 1 0070 0071 #include "G4VEmModel.hh" 0072 #include "G4PhysicsFreeVector.hh" 0073 #include <limits> 0074 #include "G4Electron.hh" 0075 #include "G4ParticleChangeForGamma.hh" 0076 #include "G4LossTableManager.hh" 0077 #include "G4VAtomDeexcitation.hh" 0078 #include "G4AtomicShell.hh" 0079 #include "G4Gamma.hh" 0080 #include "G4ShellData.hh" 0081 #include "G4DopplerProfile.hh" 0082 #include "G4Log.hh" 0083 #include "G4Exp.hh" 0084 #include "G4ForceCondition.hh" 0085 0086 class G4ParticleChangeForGamma; 0087 class G4VAtomDeexcitation; 0088 class G4ShellData; 0089 class G4DopplerProfile; 0090 0091 class G4LowEPPolarizedComptonModel : public G4VEmModel 0092 { 0093 public: 0094 explicit G4LowEPPolarizedComptonModel(const G4ParticleDefinition* p = nullptr, 0095 const G4String& nam = "LowEPComptonModel"); 0096 virtual ~G4LowEPPolarizedComptonModel(); 0097 0098 void Initialise(const G4ParticleDefinition*, const G4DataVector&) override; 0099 0100 void InitialiseLocal(const G4ParticleDefinition*, 0101 G4VEmModel* masterModel) override; 0102 0103 void InitialiseForElement(const G4ParticleDefinition*, G4int Z) override; 0104 0105 G4double ComputeCrossSectionPerAtom( const G4ParticleDefinition*, 0106 G4double kinEnergy, 0107 G4double Z, 0108 G4double A=0, 0109 G4double cut=0, 0110 G4double emax=DBL_MAX ) override; 0111 0112 void SampleSecondaries(std::vector<G4DynamicParticle*>*, 0113 const G4MaterialCutsCouple*, 0114 const G4DynamicParticle*, 0115 G4double tmin, 0116 G4double maxEnergy) override; 0117 0118 G4LowEPPolarizedComptonModel & operator=(const G4LowEPPolarizedComptonModel &right) = delete; 0119 G4LowEPPolarizedComptonModel(const G4LowEPPolarizedComptonModel&) = delete; 0120 0121 private: 0122 void ReadData(size_t Z, const char* path = 0); 0123 0124 G4double ComputeScatteringFunction(G4double x, G4int Z); 0125 G4ThreeVector GetRandomPolarization(G4ThreeVector& direction0); // Random Polarization 0126 G4ThreeVector GetPerpendicularPolarization(const G4ThreeVector& direction0, const G4ThreeVector& polarization0) const; 0127 G4ThreeVector SetNewPolarization(G4double LowEPPCepsilon, G4double sinT2, 0128 G4double phi, G4double cosTheta); 0129 G4double SetPhi(G4double, G4double); 0130 0131 void SystemOfRefChange(G4ThreeVector& direction0, G4ThreeVector& direction1, 0132 G4ThreeVector& polarization0, G4ThreeVector& polarization1); 0133 0134 void SystemOfRefChangeElect(G4ThreeVector& pdirection, G4ThreeVector& edirection, 0135 G4ThreeVector& ppolarization); 0136 0137 G4ThreeVector SetPerpendicularVector(G4ThreeVector& a); 0138 0139 G4ParticleChangeForGamma* fParticleChange; 0140 G4VAtomDeexcitation* fAtomDeexcitation; 0141 0142 static G4ShellData* shellData; 0143 static G4DopplerProfile* profileData; 0144 0145 static const G4int maxZ = 99; 0146 static G4PhysicsFreeVector* data[100]; 0147 static const G4double ScatFuncFitParam[101][9]; 0148 0149 G4int verboseLevel; 0150 G4bool isInitialised; 0151 }; 0152 0153 //**************************************************************************** 0154 0155 #endif
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