1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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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 | // $Id: G4LowEnergyPolarizedRayleigh.hh,v 1.5 2006/06/29 19:36:07 gunter Exp $ |
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27 | // GEANT4 tag $Name: geant4-09-03 $ |
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28 | // |
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29 | // -------------------------------------------------------------- |
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30 | // |
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31 | // File name: G4LowEnergyPolarizedRayleigh.hh |
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32 | // |
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33 | // Author: Capra Riccardo |
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34 | // |
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35 | // Creation date: May 2005 |
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36 | // |
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37 | // History: |
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38 | // ----------- |
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39 | // 02 May 2005 R. Capra 1st implementation |
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40 | // |
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41 | //---------------------------------------------------------------- |
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42 | |
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43 | |
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44 | #ifndef G4LowEnergyPolarizedRayleigh_hh |
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45 | #define G4LowEnergyPolarizedRayleigh_hh |
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46 | |
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47 | #include "G4VLowEnergyDiscretePhotonProcess.hh" |
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48 | |
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49 | // G4LowEnergyPolarizedRayleigh |
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50 | // The class implements the polarized Rayleigh process |
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51 | // |
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52 | // Specialization of G4VLowEnergyDiscretePhotonProcess class. |
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53 | // This is a preliminary implementation of the Rayleigh polarized process. |
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54 | // Reference articles are: |
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55 | // |
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56 | // Rayleigh process: The Quantum Theory of Radiation |
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57 | // W. Heitler, Oxford at the Clarendon Press, Oxford (1954) |
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58 | // Scattering function: A simple model of photon transport |
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59 | // D.E. Cullen, Nucl. Instr. Meth. in Phys. Res. B 101 (1995) 499-510 |
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60 | // Polarization of the outcoming photon: Beam test of a prototype detector array for the PoGO astronomical hard X-ray/soft gamma-ray polarimeter |
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61 | // T. Mizuno et al., Nucl. Instr. Meth. in Phys. Res. A 540 (2005) 158-168 |
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62 | // |
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63 | class G4LowEnergyPolarizedRayleigh : public G4VLowEnergyDiscretePhotonProcess |
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64 | { |
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65 | public: |
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66 | // Class constructor |
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67 | // processName The name of the process |
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68 | G4LowEnergyPolarizedRayleigh(const G4String &processName = "polarLowEnRayleigh"); |
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69 | |
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70 | // Class destructor |
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71 | inline virtual ~G4LowEnergyPolarizedRayleigh(void) {} |
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72 | |
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73 | // Calculates the new photon direction and polarization |
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74 | // |
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75 | // In the code the following definitions are used |
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76 | // aTrack The track |
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77 | // aStep The step |
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78 | // The proposed changes for the photon |
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79 | virtual G4VParticleChange* PostStepDoIt(const G4Track& aTrack, const G4Step& aStep); |
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80 | |
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81 | private: |
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82 | |
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83 | // Hides copy constructor |
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84 | G4LowEnergyPolarizedRayleigh(const G4LowEnergyPolarizedRayleigh&); |
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85 | |
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86 | // Hides assignment operator |
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87 | G4LowEnergyPolarizedRayleigh & operator=(const G4LowEnergyPolarizedRayleigh&); |
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88 | |
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89 | // Generates \f$cos \left ( \theta\right )\f$ of the scattered photon |
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90 | // incomingPhotonEnergy The energy of the incoming photon |
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91 | // zAtom Atomic number |
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92 | // \f$cos \left ( \theta\right )\f$ |
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93 | G4double GenerateCosTheta(G4double incomingPhotonEnergy, G4int zAtom) const; |
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94 | |
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95 | // Generates \f$\phi\f$ of the scattered photon |
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96 | // cosTheta \f$cos \left ( \theta\right )\f$ of the scattered photon |
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97 | // \f$\phi\f$ |
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98 | G4double GeneratePhi(G4double cosTheta) const; |
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99 | |
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100 | // Generates the polarization direction \f$\beta\f$ in the plane x, y relative to the x direction |
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101 | // \f$\beta\f$ |
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102 | G4double GeneratePolarizationAngle(void) const; |
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103 | |
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104 | // Lower energy limit due to the available data in the physics tables |
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105 | G4double intrinsicLowEnergyLimit; |
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106 | |
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107 | // Higher energy limit due to the available data in the physics tables |
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108 | G4double intrinsicHighEnergyLimit; |
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109 | }; |
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110 | |
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111 | #endif /* G4LowEnergyPolarizedRayleigh_hh */ |
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