| 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 | // $Id: G4LowEnergyPolarizedRayleigh.hh,v 1.5 2006/06/29 19:36:07 gunter Exp $
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| 27 | // GEANT4 tag $Name: geant4-09-02 $
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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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