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 file 00031 // 00032 // 00033 // File name: G4Generator2BS 00034 // 00035 // Author: Andreia Trindade (andreia@lip.pt) 00036 // Pedro Rodrigues (psilva@lip.pt) 00037 // Luis Peralta (luis@lip.pt) 00038 // 00039 // Creation date: 2 June 2003 00040 // 00041 // Modifications: 00042 // 02 Jun 2003 First implementation acording with new design 00043 // 12 Oct 2010 V.Ivanchenko moved RejectionFunction inline 00044 // 00045 // 00046 // Class Description: 00047 // 00048 // Concrete class for Bremsstrahlung Angular Distribution Generation 00049 // 2BS Distribution 00050 // 00051 00052 // ------------------------------------------------------------------- 00053 // 00054 00055 #ifndef G4Generator2BS_h 00056 #define G4Generator2BS_h 1 00057 00058 #include "G4ios.hh" 00059 #include "globals.hh" 00060 #include "G4VEmAngularDistribution.hh" 00061 00062 class G4Pow; 00063 00064 class G4Generator2BS : public G4VEmAngularDistribution 00065 { 00066 00067 public: 00068 00069 G4Generator2BS(const G4String& name=""); 00070 00071 virtual ~G4Generator2BS(); 00072 00073 virtual G4ThreeVector& SampleDirection(const G4DynamicParticle* dp, 00074 G4double out_energy, 00075 G4int Z, 00076 const G4Material* mat = 0); 00077 00078 void PrintGeneratorInformation() const; 00079 00080 protected: 00081 00082 inline G4double RejectionFunction(G4double value) const; 00083 00084 private: 00085 00086 // hide assignment operator 00087 G4Generator2BS & operator=(const G4Generator2BS &right); 00088 G4Generator2BS(const G4Generator2BS&); 00089 00090 G4double fz; 00091 G4double ratio; 00092 G4double ratio1; 00093 G4double ratio2; 00094 G4double delta; 00095 00096 G4Pow* g4pow; 00097 G4int nwarn; 00098 00099 }; 00100 00101 inline G4double G4Generator2BS::RejectionFunction(G4double y) const 00102 { 00103 G4double y2 = (1 + y)*(1 + y); 00104 G4double x = 4*y*ratio/y2; 00105 return 4*x - ratio1 - (ratio2 - x)*std::log(delta + fz/y2); 00106 } 00107 00108 #endif 00109