source: trunk/source/processes/electromagnetic/polarisation/src/G4PolarizedPEEffectCrossSection.cc @ 1055

Last change on this file since 1055 was 1007, checked in by garnier, 15 years ago

update to geant4.9.2
File size: 6.4 KB
Line 
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25//
26// $Id: G4PolarizedPEEffectCrossSection.cc,v 1.1 2007/11/01 17:29:09 schaelic Exp $
27// GEANT4 tag $Name: geant4-09-02 $
28//
29// GEANT4 Class file
30//
31//
32// File name:     G4PolarizedPEEffectCrossSection
33//
34// Author:        Karim Laihem
35//
36// Creation date: 15.03.2007
37//
38// Modifications:
39//   19-03-07 Modified to fit in g4.8.2 framework (A.Schaelicke)
40//
41// Class Description:
42//
43#include "G4PolarizedPEEffectCrossSection.hh"
44//#include "Randomize.hh"
45
46using namespace std;
47
48//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
49G4PolarizedPEEffectCrossSection::G4PolarizedPEEffectCrossSection()
50  {
51   cout<<"G4PolarizedPEEffectCrossSection() init\n";
52
53}
54
55//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
56G4PolarizedPEEffectCrossSection::~G4PolarizedPEEffectCrossSection()
57{}
58
59//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
60void G4PolarizedPEEffectCrossSection::Initialize(G4double aGammaE, 
61                                                 G4double aLept0E, 
62                                                 G4double sinTheta,
63                                                 const G4StokesVector & beamPol,
64                                                 const G4StokesVector & /*p1*/,
65                                                 G4int /*flag*/)
66{
67  //   cout<<"G4PolarizedPEEffectCrossSection::Initialize()\n";
68
69// G4StokesVector PolarizedPhotoElectricEffect::Transfer_G4StokesVector(
70//     G4double aGammaE,                 // Incoming Primary Gamma Energy.
71//     G4ThreeVector aGammaDir,          // Incoming Primary Gamma Direction.
72//     G4StokesVector beamPol,          // Incoming Primary Gamma  polarization.
73//     G4double aLept0E,                 // The Lepton  e- of interest Total energy.
74//     G4ThreeVector aParticl_01_Dir,    // The Lepton  e- of interest direction.
75//     G4double cos_aTetha_Angle            // The lepton of interest Scattering angle.
76//     )
77
78// ***********************************************************
79// ************  added by Karim   Polarization transfer to e- in PhotoelectricEffect.
80// ************
81// ***********************************************************
82    G4double Gfactor   = aLept0E/electron_mass_c2+1;
83    G4double Gfactor_2 = Gfactor * Gfactor;
84
85    G4double BETA    = sqrt(1. - 1./(Gfactor_2));
86
87    G4double Stokes_P3  = beamPol.z()   ;                       
88   
89    G4double m0_c2  = electron_mass_c2; 
90    G4double Lept0E = aLept0E/m0_c2+1,   Lept0E2 = Lept0E * Lept0E ;
91    G4double GammaE = aGammaE/m0_c2;
92
93
94//     G4double cosTheta = cos_aTetha_Angle;
95//     G4double sinTheta = sqrt(1- cos_aTetha_Angle * cos_aTetha_Angle);
96    G4double cosTheta = std::sqrt(1. - sinTheta*sinTheta);
97
98    G4double D_Lepton0 = (1./GammaE) * ((2./(GammaE*Lept0E*(1-BETA*cosTheta)))-1.);   
99
100    G4double I_Lepton0 = 1.0+D_Lepton0;
101
102    G4double A_Lepton0 = (Lept0E/(Lept0E+1))*(2.0/(GammaE*Lept0E) 
103                                              + BETA*cosTheta
104                                              +(2.0/((GammaE*Lept0E2)*(1.0-BETA*cosTheta)))) / I_Lepton0 ;
105   
106    G4double B_Lepton0 = (Lept0E/(Lept0E+1.0)) * BETA * sinTheta * (2.0/(GammaE*Lept0E*(1-BETA*cosTheta))-1.0)/I_Lepton0;   
107
108    G4double Stokes_S1 = (Stokes_P3 * B_Lepton0) ;
109    G4double Stokes_S2 = 0.;
110    G4double Stokes_S3 = (Stokes_P3 * A_Lepton0) ; 
111
112   
113    theFinalElectronPolarization.setX(Stokes_S1);
114    theFinalElectronPolarization.setY(Stokes_S2);
115    theFinalElectronPolarization.setZ(Stokes_S3);
116
117    if((theFinalElectronPolarization.x()*theFinalElectronPolarization.x()
118        + theFinalElectronPolarization.y()* theFinalElectronPolarization.y()
119        + theFinalElectronPolarization.z()* theFinalElectronPolarization.z())>1)
120       
121    {
122        cout<<"Warning: PhotoelectricEffect Problem in pol-transfer photon to lepton:Px2 + Py2 + Pz2 > 1"<<endl;
123        cout<<"Polarization transfer forced to be total and similar as incoming Photo"<<endl;
124        // *KL* Surprising if it arrives (never seen it up to now)
125        theFinalElectronPolarization = beamPol; // suplement de securite
126//      cout<<"PhotoEffect okay :"
127//            <<"\t"<<(aLept0E-m0_c2)/aGammaE
128//            <<"\t"<<aGammaE
129//            <<"\t"<<aLept0E
130//            <<"\t"<<cos_aTetha_Angle
131//            <<"\t"<<beamPol
132//            <<"\t"<<theFinalElectronPolarization
133//            <<"\t"<<A_Lepton0
134//            <<endl;
135    }
136}
137
138
139
140//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
141
142G4double G4PolarizedPEEffectCrossSection::XSection(const G4StokesVector & /*pol2*/,
143                                                   const G4StokesVector & /*pol3*/)
144{
145  cout<<"ERROR dummy routine G4PolarizedPEEffectCrossSection::XSection() called\n";
146  return 0;
147} 
148
149//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
150
151G4StokesVector G4PolarizedPEEffectCrossSection::GetPol2()
152{
153  return theFinalElectronPolarization;
154}
155
156//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
157
158G4StokesVector G4PolarizedPEEffectCrossSection::GetPol3()
159{
160  return G4StokesVector();
161}
162
163
164
165//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
166
167
168//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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