[807] | 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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| 7 | // * conditions of the Geant4 Software License, included in the file * |
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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| 9 | // * include a list of copyright holders. * |
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| 10 | // * * |
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| 11 | // * Neither the authors of this software system, nor their employing * |
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| 12 | // * institutes,nor the agencies providing financial support for this * |
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| 13 | // * work make any representation or warranty, express or implied, * |
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| 14 | // * regarding this software system or assume any liability for its * |
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| 15 | // * use. Please see the license in the file LICENSE and URL above * |
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| 16 | // * for the full disclaimer and the limitation of liability. * |
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| 17 | // * * |
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| 18 | // * This code implementation is the result of the scientific and * |
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| 19 | // * technical work of the GEANT4 collaboration. * |
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| 20 | // * By using, copying, modifying or distributing the software (or * |
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| 21 | // * any work based on the software) you agree to acknowledge its * |
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| 22 | // * use in resulting scientific publications, and indicate your * |
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| 23 | // * acceptance of all terms of the Geant4 Software license. * |
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| 24 | // ******************************************************************** |
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| 25 | // |
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| 26 | // |
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[1230] | 27 | // G4ScreenedNuclearRecoil.hh,v 1.24 2008/05/01 19:58:59 marcus Exp |
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| 28 | // GEANT4 tag |
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[807] | 29 | // |
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| 30 | // |
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| 31 | // |
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| 32 | // Class Description |
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| 33 | // Process for screened electromagnetic nuclear elastic scattering; |
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| 34 | // Physics comes from: |
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| 35 | // Marcus H. Mendenhall and Robert A. Weller, |
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| 36 | // "Algorithms for the rapid computation of classical cross sections |
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| 37 | // for screened Coulomb collisions " |
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| 38 | // Nuclear Instruments and Methods in Physics Research B58 (1991) 11-17 |
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| 39 | // The only input required is a screening function phi(r/a) which is the ratio |
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| 40 | // of the actual interatomic potential for two atoms with atomic numbers Z1 and Z2, |
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| 41 | // to the unscreened potential Z1*Z2*e^2/r where e^2 is elm_coupling in Geant4 units |
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| 42 | // the actual screening tables are computed externally in a python module "screened_scattering.py" |
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| 43 | // to allow very specific screening functions to be added if desired, without messing |
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| 44 | // with the insides of this code. |
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| 45 | // |
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| 46 | // First version, April 2004, Marcus H. Mendenhall, Vanderbilt University |
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[1230] | 47 | // May 1, 2008 -- Added code to allow process to have zero cross section above max energy, to coordinate with G4MSC. -- mhm |
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[807] | 48 | // |
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| 49 | // Class Description - End |
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| 50 | |
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| 51 | |
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| 52 | #ifndef G4ScreenedNuclearRecoil_h |
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| 53 | #define G4ScreenedNuclearRecoil_h 1 |
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| 54 | |
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| 55 | #include "globals.hh" |
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| 56 | #include "G4VDiscreteProcess.hh" |
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[1230] | 57 | #include "G4ParticleChange.hh" |
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[807] | 58 | #include "c2_function.hh" |
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| 59 | |
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| 60 | #include <map> |
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| 61 | #include <vector> |
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| 62 | |
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[1230] | 63 | class G4VNIELPartition; |
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[807] | 64 | |
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[1230] | 65 | typedef c2_const_ptr<G4double> G4_c2_const_ptr; |
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| 66 | typedef c2_ptr<G4double> G4_c2_ptr; |
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| 67 | typedef c2_function<G4double> G4_c2_function; |
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| 68 | |
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[807] | 69 | typedef struct G4ScreeningTables { |
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| 70 | G4double z1, z2, m1, m2, au, emin; |
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[1230] | 71 | G4_c2_const_ptr EMphiData; |
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[807] | 72 | } G4ScreeningTables; |
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| 73 | |
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| 74 | // A class for loading ScreenedCoulombCrossSections |
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| 75 | class G4ScreenedCoulombCrossSectionInfo |
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| 76 | { |
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| 77 | public: |
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[1230] | 78 | G4ScreenedCoulombCrossSectionInfo() { } |
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| 79 | ~G4ScreenedCoulombCrossSectionInfo() { } |
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| 80 | |
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| 81 | static const char* CVSHeaderVers() { return |
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| 82 | "G4ScreenedNuclearRecoil.hh,v 1.24 2008/05/01 19:58:59 marcus Exp GEANT4 tag "; |
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| 83 | } |
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| 84 | static const char* CVSFileVers(); |
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[807] | 85 | }; |
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| 86 | |
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| 87 | // A class for loading ScreenedCoulombCrossSections |
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| 88 | class G4ScreenedCoulombCrossSection : public G4ScreenedCoulombCrossSectionInfo |
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| 89 | { |
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| 90 | public: |
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| 91 | |
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| 92 | G4ScreenedCoulombCrossSection() : verbosity(1) { } |
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| 93 | G4ScreenedCoulombCrossSection(const G4ScreenedCoulombCrossSection &src) : |
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| 94 | G4ScreenedCoulombCrossSectionInfo(),verbosity(src.verbosity) { } |
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| 95 | virtual ~G4ScreenedCoulombCrossSection(); |
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| 96 | |
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| 97 | typedef std::map<G4int, G4ScreeningTables> ScreeningMap; |
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| 98 | |
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| 99 | // a local, fast-access mapping of a particle's Z to its full definition |
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| 100 | typedef std::map<G4int, class G4ParticleDefinition *> ParticleCache; |
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| 101 | |
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| 102 | // LoadData is called by G4ScreenedNuclearRecoil::GetMeanFreePath |
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| 103 | // It loads the data tables, builds the elemental cross-section tables. |
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| 104 | virtual void LoadData(G4String screeningKey, G4int z1, G4double m1, G4double recoilCutoff) = 0; |
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| 105 | |
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| 106 | // BuildMFPTables is called by G4ScreenedNuclearRecoil::GetMeanFreePath to build the MFP tables for each material |
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| 107 | void BuildMFPTables(void); // scan the MaterialsTable and construct MFP tables |
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| 108 | |
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| 109 | virtual G4ScreenedCoulombCrossSection *create() = 0; // a 'virtual constructor' which clones the class |
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| 110 | const G4ScreeningTables *GetScreening(G4int Z) { return &(screeningData[Z]); } |
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| 111 | void SetVerbosity(G4int v) { verbosity=v; } |
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| 112 | |
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| 113 | // this process needs element selection weighted only by number density |
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| 114 | G4ParticleDefinition* SelectRandomUnweightedTarget(const G4MaterialCutsCouple* couple); |
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| 115 | |
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| 116 | enum { nMassMapElements=116 }; |
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| 117 | |
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| 118 | G4double standardmass(G4int z1) { return z1 <= nMassMapElements ? massmap[z1] : 2.5*z1; } |
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| 119 | |
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| 120 | // get the mean-free-path table for the indexed material |
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[1230] | 121 | const G4_c2_function * operator [] (G4int materialIndex) { |
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| 122 | return MFPTables.find(materialIndex)!=MFPTables.end() ? &(MFPTables[materialIndex].get()) : (G4_c2_function *)0; |
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[807] | 123 | } |
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| 124 | |
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| 125 | protected: |
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| 126 | ScreeningMap screeningData; // screening tables for each element |
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| 127 | ParticleCache targetMap; |
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| 128 | G4int verbosity; |
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[1230] | 129 | std::map<G4int, G4_c2_const_ptr > sigmaMap; // total cross section for each element |
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| 130 | std::map<G4int, G4_c2_const_ptr > MFPTables; // MFP for each material |
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[807] | 131 | |
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| 132 | private: |
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| 133 | static const G4double massmap[nMassMapElements+1]; |
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| 134 | |
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| 135 | }; |
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| 136 | |
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| 137 | typedef struct G4CoulombKinematicsInfo { |
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| 138 | G4double impactParameter; |
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| 139 | G4ScreenedCoulombCrossSection *crossSection; |
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| 140 | G4double a1, a2, sinTheta, cosTheta, sinZeta, cosZeta, eRecoil; |
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[1230] | 141 | G4ParticleDefinition *recoilIon; |
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| 142 | const G4Material *targetMaterial; |
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| 143 | } G4CoulombKinematicsInfo; |
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[807] | 144 | |
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| 145 | class G4ScreenedCollisionStage { |
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| 146 | public: |
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| 147 | virtual void DoCollisionStep(class G4ScreenedNuclearRecoil *master, |
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| 148 | const class G4Track& aTrack, const class G4Step& aStep)=0; |
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| 149 | virtual ~G4ScreenedCollisionStage() {} |
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| 150 | }; |
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| 151 | |
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| 152 | class G4ScreenedCoulombClassicalKinematics: public G4ScreenedCoulombCrossSectionInfo, public G4ScreenedCollisionStage { |
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| 153 | |
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| 154 | public: |
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[1230] | 155 | G4ScreenedCoulombClassicalKinematics(); |
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[807] | 156 | virtual void DoCollisionStep(class G4ScreenedNuclearRecoil *master, |
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| 157 | const class G4Track& aTrack, const class G4Step& aStep); |
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| 158 | |
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| 159 | G4bool DoScreeningComputation(class G4ScreenedNuclearRecoil *master, |
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| 160 | const G4ScreeningTables *screen, |
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| 161 | G4double eps, G4double beta); |
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[1230] | 162 | virtual ~G4ScreenedCoulombClassicalKinematics() { } |
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| 163 | protected: |
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| 164 | // the c2_functions we need to do the work. |
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| 165 | c2_const_plugin_function_p<G4double> &phifunc; |
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| 166 | c2_linear_p<G4double> &xovereps; |
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| 167 | G4_c2_ptr diff; |
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| 168 | |
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[807] | 169 | }; |
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| 170 | |
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| 171 | class G4SingleScatter: public G4ScreenedCoulombCrossSectionInfo, public G4ScreenedCollisionStage { |
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| 172 | |
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| 173 | public: |
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| 174 | G4SingleScatter() { } |
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| 175 | virtual void DoCollisionStep(class G4ScreenedNuclearRecoil *master, |
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| 176 | const class G4Track& aTrack, const class G4Step& aStep); |
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| 177 | virtual ~G4SingleScatter() {} |
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| 178 | }; |
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| 179 | |
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[1230] | 180 | /** |
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| 181 | \brief A process which handles screened Coulomb collisions between nuclei |
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| 182 | |
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| 183 | */ |
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| 184 | |
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[807] | 185 | class G4ScreenedNuclearRecoil : public G4ScreenedCoulombCrossSectionInfo, public G4VDiscreteProcess |
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| 186 | { |
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| 187 | public: |
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| 188 | |
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| 189 | friend class G4ScreenedCollisionStage; |
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| 190 | |
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[1230] | 191 | /// \brief Construct the process and set some physics parameters for it. |
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| 192 | /// \param processName the name to assign the process |
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| 193 | /// \param ScreeningKey the name of a screening function to use. |
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| 194 | /// The default functions are "zbl" (recommended for soft scattering), |
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| 195 | /// "lj" (recommended for backscattering) and "mol" (Moliere potential) |
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| 196 | /// \param GenerateRecoils if frue, ions struck by primary are converted into new moving particles. |
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| 197 | /// If false, energy is deposited, but no new moving ions are created. |
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| 198 | /// \param RecoilCutoff energy below which no new moving particles will be created, |
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| 199 | /// even if \a GenerateRecoils is true. |
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| 200 | /// Also, a moving primary particle will be stopped if its energy falls below this limit. |
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| 201 | /// \param PhysicsCutoff the energy transfer to which screening tables are calucalted. |
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| 202 | /// There is no really |
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| 203 | /// compelling reason to change it from the 10.0 eV default. However, see the paper on running this |
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| 204 | /// in thin targets for further discussion, and its interaction with SetMFPScaling() |
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[807] | 205 | G4ScreenedNuclearRecoil(const G4String& processName = "ScreenedElastic", |
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| 206 | const G4String &ScreeningKey="zbl", G4bool GenerateRecoils=1, |
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| 207 | G4double RecoilCutoff=100.0*eV, G4double PhysicsCutoff=10.0*eV); |
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[1230] | 208 | /// \brief destructor |
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[807] | 209 | virtual ~G4ScreenedNuclearRecoil(); |
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[1230] | 210 | /// \brief used internally by Geant4 machinery |
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[807] | 211 | virtual G4double GetMeanFreePath(const G4Track&, G4double, G4ForceCondition* ); |
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[1230] | 212 | /// \brief used internally by Geant4 machinery |
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[807] | 213 | virtual G4VParticleChange* PostStepDoIt(const G4Track& aTrack, const G4Step& aStep); |
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[1230] | 214 | /// \brief test if a prticle of type \a aParticleType can use this process |
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| 215 | /// \param aParticleType the particle to test |
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[807] | 216 | virtual G4bool IsApplicable(const G4ParticleDefinition& aParticleType); |
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[1230] | 217 | /// \brief Build physics tables in advance. Not Implemented. |
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| 218 | /// \param aParticleType the type of particle to build tables for |
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[807] | 219 | virtual void BuildPhysicsTable(const G4ParticleDefinition&) { } |
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[1230] | 220 | /// \brief Export physics tables for persistency. Not Implemented. |
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| 221 | /// \param aParticleType the type of particle to build tables for |
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[807] | 222 | virtual void DumpPhysicsTable(const G4ParticleDefinition& aParticleType); |
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[1230] | 223 | /// \brief deterine if the moving particle is within the strong force range of the selected nucleus |
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| 224 | /// \param A the nucleon number of the beam |
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| 225 | /// \param A1 the nucleon number of the target |
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| 226 | /// \param apsis the distance of closest approach |
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[807] | 227 | virtual G4bool CheckNuclearCollision(G4double A, G4double A1, G4double apsis); // return true if hard collision |
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| 228 | |
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| 229 | virtual G4ScreenedCoulombCrossSection *GetNewCrossSectionHandler(void); |
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| 230 | |
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[1230] | 231 | /// \brief Get non-ionizing energy loss for last step |
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| 232 | G4double GetNIEL() const { return NIEL; } |
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[807] | 233 | |
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[1230] | 234 | /// \brief clear precomputed screening tables |
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[807] | 235 | void ResetTables(); // clear all data tables to allow changing energy cutoff, materials, etc. |
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[1230] | 236 | |
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| 237 | /// \brief set the upper energy beyond which this process has no cross section |
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| 238 | /// |
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| 239 | /// This funciton is used to coordinate this process with G4MSC. Typically, G4MSC should |
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| 240 | /// not be allowed to operate in a range which overlaps that of this process. The criterion which is most reasonable |
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| 241 | /// is that the transition should be somewhere in the modestly relativistic regime (500 MeV/u for example). |
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| 242 | /// \param energy energy per nucleon for the cutoff |
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| 243 | void SetMaxEnergyForScattering(G4double energy) { processMaxEnergy=energy; } |
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| 244 | /// \brief find out what screening funciton we are using |
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[807] | 245 | std::string GetScreeningKey() const { return screeningKey; } |
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[1230] | 246 | /// \brief enable or disable all energy deposition by this process |
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| 247 | /// \param flag if true, enable deposition of energy (the default). If false, disable deposition. |
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[807] | 248 | void AllowEnergyDeposition(G4bool flag) { registerDepositedEnergy=flag; } |
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[1230] | 249 | /// \brief get flag indicating whether deposition is enabled |
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[807] | 250 | G4bool GetAllowEnergyDeposition() const { return registerDepositedEnergy; } |
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[1230] | 251 | /// \brief enable or disable the generation of recoils. |
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| 252 | /// If recoils are disabled, the energy they would have received is just deposited. |
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| 253 | /// \param flag if true, create recoil ions in cases in which the energy is above the recoilCutoff. |
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| 254 | /// If false, just deposit the energy. |
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[807] | 255 | void EnableRecoils(G4bool flag) { generateRecoils=flag; } |
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[1230] | 256 | /// \brief find out if generation of recoils is enabled. |
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[807] | 257 | G4bool GetEnableRecoils() const { return generateRecoils; } |
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[1230] | 258 | /// \brief set the mean free path scaling as specified |
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| 259 | /// \param scale the factor by which the default MFP will be scaled. |
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| 260 | /// Set to less than 1 for very thin films, typically, to sample multiple scattering, |
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| 261 | /// or to greater than 1 for quick simulaitons with a very long flight path. |
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[807] | 262 | void SetMFPScaling(G4double scale) { MFPScale=scale; } |
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[1230] | 263 | /// \brief get the MFPScaling parameter |
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[807] | 264 | G4double GetMFPScaling() const { return MFPScale; } |
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[1230] | 265 | /// \brief enable or disable whether this process will skip collisions |
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| 266 | /// which are close enough they need hadronic phsyics. Default is true (skip close collisions). |
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| 267 | /// Disabling this results in excess nuclear stopping power. |
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| 268 | /// \param flag true results in hard collisions being skipped. false allows hard collisions. |
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[807] | 269 | void AvoidNuclearReactions(G4bool flag) { avoidReactions=flag; } |
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[1230] | 270 | /// \brief get the flag indicating whether hadronic collisions are ignored. |
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[807] | 271 | G4bool GetAvoidNuclearReactions() const { return avoidReactions; } |
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[1230] | 272 | /// \brief set the minimum energy (per nucleon) at which recoils can be generated, |
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| 273 | /// and the energy (per nucleon) below which all ions are stopped. |
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| 274 | /// \param energy energy per nucleon |
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[807] | 275 | void SetRecoilCutoff(G4double energy) { recoilCutoff=energy; } |
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[1230] | 276 | /// \brief get the recoil cutoff |
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[807] | 277 | G4double GetRecoilCutoff() const { return recoilCutoff; } |
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[1230] | 278 | /// \brief set the energy to which screening tables are computed. Typically, this is 10 eV or so, and not often changed. |
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| 279 | /// \param energy the cutoff energy |
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[807] | 280 | void SetPhysicsCutoff(G4double energy) { physicsCutoff=energy; ResetTables(); } |
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[1230] | 281 | /// \brief get the physics cutoff energy. |
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[807] | 282 | G4double GetPhysicsCutoff() const { return physicsCutoff; } |
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[1230] | 283 | /// \brief set the pointer to a class for paritioning energy into NIEL |
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| 284 | /// \brief part the pointer to the class. |
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| 285 | void SetNIELPartitionFunction(const G4VNIELPartition *part); |
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| 286 | /// \brief set the cross section boost to provide faster computation of backscattering |
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| 287 | /// \param fraction the fraction of particles to have their cross section boosted. |
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| 288 | /// \param HardeningFactor the factor by which to boost the scattering cross section. |
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[807] | 289 | void SetCrossSectionHardening(G4double fraction, G4double HardeningFactor) { |
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| 290 | hardeningFraction=fraction; |
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| 291 | hardeningFactor=HardeningFactor; |
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| 292 | } |
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[1230] | 293 | /// \brief get the fraction of particles which will have boosted scattering |
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[807] | 294 | G4double GetHardeningFraction() const { return hardeningFraction; } |
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[1230] | 295 | /// \brief get the boost factor in use. |
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[807] | 296 | G4double GetHardeningFactor() const { return hardeningFactor; } |
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[1230] | 297 | /// \brief the the interaciton length used in the last scattering. |
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[807] | 298 | G4double GetCurrentInteractionLength() const { return currentInteractionLength; } |
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[1230] | 299 | /// \brief set a function to compute screening tables, if the user needs non-standard behavior. |
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| 300 | /// \param cs a class which constructs the screening tables. |
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[807] | 301 | void SetExternalCrossSectionHandler(G4ScreenedCoulombCrossSection *cs) { |
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| 302 | externalCrossSectionConstructor=cs; |
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| 303 | } |
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[1230] | 304 | /// \brief get the verbosity. |
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[807] | 305 | G4int GetVerboseLevel() const { return verboseLevel; } |
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[1230] | 306 | |
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[807] | 307 | std::map<G4int, G4ScreenedCoulombCrossSection*> &GetCrossSectionHandlers() |
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| 308 | { return crossSectionHandlers; } |
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| 309 | void ClearStages(void); |
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| 310 | void AddStage(G4ScreenedCollisionStage *stage) { collisionStages.push_back(stage); } |
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| 311 | G4CoulombKinematicsInfo &GetKinematics() { return kinematics; } |
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| 312 | void SetValidCollision(G4bool flag) { validCollision=flag; } |
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| 313 | G4bool GetValidCollision() const { return validCollision; } |
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[1230] | 314 | |
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| 315 | /// \brief get the pointer to our ParticleChange object. for internal use, primarily. |
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| 316 | class G4ParticleChange &GetParticleChange() { return static_cast<G4ParticleChange &>(*pParticleChange); } |
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| 317 | /// \brief take the given energy, and use the material information to partition it into NIEL and ionizing energy. |
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| 318 | void DepositEnergy(G4int z1, G4double a1, const G4Material *material, G4double energy); |
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[807] | 319 | |
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| 320 | protected: |
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[1230] | 321 | /// \brief the energy per nucleon above which the MFP is constant |
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| 322 | G4double highEnergyLimit; |
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| 323 | /// \brief the energy per nucleon below which the MFP is zero |
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| 324 | G4double lowEnergyLimit; |
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| 325 | /// \brief the energy per nucleon beyond which the cross section is zero, to cross over to G4MSC |
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| 326 | G4double processMaxEnergy; |
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[807] | 327 | G4String screeningKey; |
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| 328 | G4bool generateRecoils, avoidReactions; |
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| 329 | G4double recoilCutoff, physicsCutoff; |
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| 330 | G4bool registerDepositedEnergy; |
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[1230] | 331 | G4double IonizingLoss, NIEL; |
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[807] | 332 | G4double MFPScale; |
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| 333 | G4double hardeningFraction, hardeningFactor; |
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| 334 | |
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| 335 | G4ScreenedCoulombCrossSection *externalCrossSectionConstructor; |
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| 336 | std::vector<G4ScreenedCollisionStage *> collisionStages; |
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| 337 | |
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| 338 | std::map<G4int, G4ScreenedCoulombCrossSection*> crossSectionHandlers; |
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| 339 | |
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| 340 | G4bool validCollision; |
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| 341 | G4CoulombKinematicsInfo kinematics; |
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[1230] | 342 | const G4VNIELPartition *NIELPartitionFunction; |
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[807] | 343 | }; |
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| 344 | |
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| 345 | // A customized G4CrossSectionHandler which gets its data from an external program |
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| 346 | class G4NativeScreenedCoulombCrossSection: public G4ScreenedCoulombCrossSection |
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| 347 | { |
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| 348 | public: |
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| 349 | G4NativeScreenedCoulombCrossSection(); |
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| 350 | |
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| 351 | G4NativeScreenedCoulombCrossSection(const G4NativeScreenedCoulombCrossSection &src) |
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| 352 | : G4ScreenedCoulombCrossSection(src), phiMap(src.phiMap) { } |
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| 353 | |
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| 354 | G4NativeScreenedCoulombCrossSection(const G4ScreenedCoulombCrossSection &src) : G4ScreenedCoulombCrossSection(src) { } |
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| 355 | virtual ~G4NativeScreenedCoulombCrossSection(); |
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| 356 | |
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| 357 | virtual void LoadData(G4String screeningKey, G4int z1, G4double m1, G4double recoilCutoff); |
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| 358 | virtual G4ScreenedCoulombCrossSection *create() |
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| 359 | { return new G4NativeScreenedCoulombCrossSection(*this); } |
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| 360 | // get a list of available keys |
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| 361 | std::vector<G4String> GetScreeningKeys() const; |
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| 362 | |
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[1230] | 363 | typedef G4_c2_function &(*ScreeningFunc)(G4int z1, G4int z2, size_t nPoints, G4double rMax, G4double *au); |
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[807] | 364 | |
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| 365 | void AddScreeningFunction(G4String name, ScreeningFunc fn) { |
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| 366 | phiMap[name]=fn; |
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| 367 | } |
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| 368 | |
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| 369 | private: |
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| 370 | // this is a map used to look up screening function generators |
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| 371 | std::map<std::string, ScreeningFunc> phiMap; |
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| 372 | }; |
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| 373 | |
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[1230] | 374 | G4_c2_function &ZBLScreening(G4int z1, G4int z2, size_t npoints, G4double rMax, G4double *auval); |
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| 375 | G4_c2_function &MoliereScreening(G4int z1, G4int z2, size_t npoints, G4double rMax, G4double *auval); |
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| 376 | G4_c2_function &LJScreening(G4int z1, G4int z2, size_t npoints, G4double rMax, G4double *auval); |
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| 377 | G4_c2_function &LJZBLScreening(G4int z1, G4int z2, size_t npoints, G4double rMax, G4double *auval); |
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[807] | 378 | |
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| 379 | #endif |
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