source: trunk/source/processes/electromagnetic/polarisation/src/G4PolarizedPEEffectModel.cc@ 1134

Last change on this file since 1134 was 1007, checked in by garnier, 17 years ago

update to geant4.9.2
File size: 6.3 KB
Line 
1//
2// ********************************************************************
3// * License and Disclaimer *
4// * *
5// * The Geant4 software is copyright of the Copyright Holders of *
6// * the Geant4 Collaboration. It is provided under the terms and *
7// * conditions of the Geant4 Software License, included in the file *
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14// * regarding this software system or assume any liability for its *
15// * use. Please see the license in the file LICENSE and URL above *
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17// * *
18// * This code implementation is the result of the scientific and *
19// * technical work of the GEANT4 collaboration. *
20// * By using, copying, modifying or distributing the software (or *
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24// ********************************************************************
25//
26// $Id: G4PolarizedPEEffectModel.cc,v 1.1 2007/11/01 17:29:09 schaelic Exp $
27// GEANT4 tag $Name: geant4-09-02 $
28//
29// -------------------------------------------------------------------
30//
31// GEANT4 Class file
32//
33//
34// File name: G4PolarizedPEEffectModel
35//
36// Author: Andreas Schaelicke & Karim Laihem
37//
38// Creation date: 22.02.2007
39//
40// Modifications:
41//
42// Class Description:
43//
44// Implementation of Photo electric effect
45// including polarization transfer from circularly polarised gammas
46
47// -------------------------------------------------------------------
48//
49
50//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
51//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
52
53#ifndef NOIONIZATIONAS
54
55#include "G4PolarizedPEEffectModel.hh"
56#include "G4Electron.hh"
57#include "G4Positron.hh"
58#include "G4Gamma.hh"
59#include "Randomize.hh"
60#include "G4DataVector.hh"
61#include "G4PhysicsLogVector.hh"
62#include "G4ParticleChangeForGamma.hh"
63#include "G4PolarizedPEEffectCrossSection.hh"
64#include "G4PolarizationHelper.hh"
65
66//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
67
68
69G4PolarizedPEEffectModel::G4PolarizedPEEffectModel(const G4ParticleDefinition* pd,
70 const G4String& nam)
71 : G4PEEffectModel(pd,nam),crossSectionCalculator(0)
72{
73}
74
75//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
76
77G4PolarizedPEEffectModel::~G4PolarizedPEEffectModel()
78{
79 if (crossSectionCalculator) delete crossSectionCalculator;
80}
81
82//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
83
84void G4PolarizedPEEffectModel::Initialise(const G4ParticleDefinition* pd,
85 const G4DataVector& dv)
86{
87 G4PEEffectModel::Initialise(pd,dv);
88 if (!crossSectionCalculator)
89 crossSectionCalculator = new G4PolarizedPEEffectCrossSection();
90}
91
92//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
93
94void G4PolarizedPEEffectModel::SampleSecondaries(std::vector<G4DynamicParticle*>* vdp,
95 const G4MaterialCutsCouple* couple,
96 const G4DynamicParticle* dp,
97 G4double tmin,
98 G4double maxEnergy)
99{
100 // std::vector<G4DynamicParticle*>* vdp =
101 G4PEEffectModel::SampleSecondaries(vdp,couple, dp, tmin, maxEnergy);
102
103 if(vdp && vdp->size()>0) {
104 G4double gamEnergy0 = dp->GetKineticEnergy();
105 G4double lepEnergy1 = (*vdp)[0]->GetKineticEnergy();
106 G4double sintheta = dp->GetMomentumDirection().cross((*vdp)[0]->GetMomentumDirection()).mag();
107 if (sintheta>1.) sintheta=1.;
108
109 G4StokesVector beamPol = dp->GetPolarization();
110 beamPol.SetPhoton();
111 // G4cout<<" beamPol "<<beamPol<<G4endl;
112
113 // determine interaction plane
114 G4ThreeVector nInteractionFrame =
115 G4PolarizationHelper::GetFrame(dp->GetMomentumDirection(),
116 (*vdp)[0]->GetMomentumDirection());
117 // G4cout<<" nInteractionFrame = "<<nInteractionFrame<<G4endl;
118 if (dp->GetMomentumDirection().cross((*vdp)[0]->GetMomentumDirection()).mag()<1.e-10) {
119 // G4cout<<" nInteractionFrame not well defined "<<G4endl;
120 // G4cout<<" choosing random interaction frame "<<G4endl;
121
122 nInteractionFrame = G4PolarizationHelper::GetRandomFrame(dp->GetMomentumDirection());
123 // G4cout<<"new nInteractionFrame = "<<nInteractionFrame<<G4endl;
124 }
125 /*
126 else {
127 G4ThreeVector mom1=dp->GetMomentumDirection();
128 G4ThreeVector mom2=(*vdp)[0]->GetMomentumDirection();
129 G4cout<<" mom1 = "<<mom1<<G4endl;
130 G4cout<<" mom2 = "<<mom2<<G4endl;
131 G4ThreeVector x=mom1.cross(mom2);
132 G4cout<<" mom1 x mom2 = "<<x<<" "<<x.mag()<<G4endl;
133 G4cout<<" norm = "<<(1./x.mag()*x)<<" "<<G4endl;
134 }
135 */
136
137 // transform polarization into interaction frame
138 beamPol.InvRotateAz(nInteractionFrame,dp->GetMomentumDirection());
139
140 // calulcate polarization transfer
141 crossSectionCalculator->SetMaterial(GetCurrentElement()->GetN(), // number of nucleons
142 GetCurrentElement()->GetZ(),
143 GetCurrentElement()->GetfCoulomb());
144 crossSectionCalculator->Initialize(gamEnergy0, lepEnergy1, sintheta,
145 beamPol, G4StokesVector::ZERO);
146
147 // deterimine final state polarization
148 G4StokesVector lep1Pol = crossSectionCalculator->GetPol2();
149 // G4cout<<" lepPol "<<lep1Pol<<G4endl;
150 lep1Pol.RotateAz(nInteractionFrame,(*vdp)[0]->GetMomentumDirection());
151 (*vdp)[0]->SetPolarization(lep1Pol.p1(),
152 lep1Pol.p2(),
153 lep1Pol.p3());
154
155 // G4cout<<" lepPol "<<lep1Pol<<G4endl;
156 size_t num = vdp->size();
157 if (num!=1) G4cout<<" WARNING "<<num<<" secondaries in polarized photo electric effect not supported!\n";
158 }
159}
160
161//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
162#endif //NOIONIZATIONAS
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