Geant4  10.03.p02
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G4PolarizedPairProductionCrossSection Class Reference

#include <G4PolarizedPairProductionCrossSection.hh>

Inheritance diagram for G4PolarizedPairProductionCrossSection:
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Collaboration diagram for G4PolarizedPairProductionCrossSection:
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Public Member Functions

 G4PolarizedPairProductionCrossSection ()
 
virtual void Initialize (G4double eps, G4double X, G4double phi, const G4StokesVector &p0, const G4StokesVector &p1, G4int flag=0) override
 
virtual G4double XSection (const G4StokesVector &pol2, const G4StokesVector &pol3) override
 
G4StokesVector GetPol2 () override
 
G4StokesVector GetPol3 () override
 
- Public Member Functions inherited from G4VPolarizedCrossSection
 G4VPolarizedCrossSection ()
 
virtual ~G4VPolarizedCrossSection ()
 
virtual G4double TotalXSection (G4double xmin, G4double xmax, G4double y, const G4StokesVector &pol0, const G4StokesVector &pol1)
 
G4double GetYmin ()
 
virtual G4double GetXmin (G4double y)
 
virtual G4double GetXmax (G4double y)
 
void SetMaterial (G4double A, G4double Z, G4double coul)
 

Additional Inherited Members

- Protected Member Functions inherited from G4VPolarizedCrossSection
void SetXmin (G4double xmin)
 
void SetXmax (G4double xmax)
 
void SetYmin (G4double ymin)
 
- Protected Attributes inherited from G4VPolarizedCrossSection
G4double fXmin
 
G4double fXmax
 
G4double fYmin
 
G4double theA
 
G4double theZ
 
G4double fCoul
 

Detailed Description

Definition at line 53 of file G4PolarizedPairProductionCrossSection.hh.

Constructor & Destructor Documentation

G4PolarizedPairProductionCrossSection::G4PolarizedPairProductionCrossSection ( )

Definition at line 74 of file G4PolarizedPairProductionCrossSection.cc.

75 {
76  InitializeMe();
77 }

Member Function Documentation

G4StokesVector G4PolarizedPairProductionCrossSection::GetPol2 ( )
overridevirtual

Reimplemented from G4VPolarizedCrossSection.

Definition at line 195 of file G4PolarizedPairProductionCrossSection.cc.

196 {
197  // electron/positron
198  return theFinalElectronPolarization;
199 }
G4StokesVector G4PolarizedPairProductionCrossSection::GetPol3 ( )
overridevirtual

Reimplemented from G4VPolarizedCrossSection.

Definition at line 200 of file G4PolarizedPairProductionCrossSection.cc.

201 {
202  // photon
203  return theFinalPositronPolarization;;
204 }
void G4PolarizedPairProductionCrossSection::Initialize ( G4double  eps,
G4double  X,
G4double  phi,
const G4StokesVector &  p0,
const G4StokesVector &  p1,
G4int  flag = 0 
)
overridevirtual

Reimplemented from G4VPolarizedCrossSection.

Definition at line 80 of file G4PolarizedPairProductionCrossSection.cc.

86 {
87  G4double aLept1E = aGammaE - aLept0E;
88 
89  G4double Stokes_P3 = beamPol.z() ;
90  // **************************************************************************
91 
92  G4double m0_c2 = electron_mass_c2;
93  G4double Lept0E = aLept0E/m0_c2+1., Lept0E2 = Lept0E * Lept0E ;
94  G4double GammaE = aGammaE/m0_c2;
95  G4double Lept1E = aLept1E/m0_c2-1., Lept1E2 = Lept1E * Lept1E ;
96 
97 
98  // const G4Element* theSelectedElement = theModel->SelectedAtom();
99 
100  // ******* Gamma Transvers Momentum
101 
102  G4double TMom = std::sqrt(Lept0E2 -1.)* sintheta, u = TMom , u2 =u * u ;
103  G4double Xsi = 1./(1.+u2) , Xsi2 = Xsi * Xsi ;
104 
105  // G4double theZ = theSelectedElement->GetZ();
106 
107  // G4double fCoul = theSelectedElement->GetfCoulomb();
108  G4double delta = 12. * std::pow(theZ, 1./3.) * Lept0E * Lept1E * Xsi / (121. * GammaE);
109  G4double GG=0.;
110 
111  if(delta < 0.5) {
112  GG = std::log(2.* Lept0E * Lept1E / GammaE) - 2. - fCoul;
113  }
114  else if ( delta < 120.) {
115  for (G4int j=2; j<=19; j++) {
116  if(SCRN[1][j] >= delta) {
117  GG =std::log(2. * Lept0E * Lept1E / GammaE) - 2. - fCoul
118  -(SCRN[2][j-1]+(delta-SCRN[1][j-1])*(SCRN[2][j]-SCRN[2][j-1])/(SCRN[1][j]-SCRN[1][j-1]));
119  break;
120  }
121  }
122  }
123  else {
124  G4double alpha_sc = (111. * std::pow(theZ, -1./3.)) / Xsi;
125  GG = std::log(alpha_sc)- 2. - fCoul;
126  }
127 
128  if(GG<-1.) GG=-1.; // *KL* do we need this ?!
129 
130 
131  G4double I_Lepton = (Lept0E2 + Lept1E2)*(3+2*GG) + 2. * Lept0E * Lept1E * (1. + 4. * u2 * Xsi2 * GG);
132 
133  // G4double D_Lepton1 = -8 * Lept0E * Lept1E * u2 * Xsi2 * GG / I_Lepton;
134 
135  G4double L_Lepton1 = GammaE * ((Lept0E - Lept1E) * (3. + 2. * GG)+2 * Lept1E * (1. + 4. * u2 * Xsi2 * GG))/I_Lepton;
136 
137  G4double T_Lepton1 = 4. * GammaE * Lept1E * Xsi * u * (1. - 2. * Xsi) * GG / I_Lepton ;
138 
139 
140  G4double Stokes_S1 = (Stokes_P3 * T_Lepton1) ;
141  G4double Stokes_S2 = 0.;
142  G4double Stokes_S3 = (Stokes_P3 * L_Lepton1) ;
143 
144 
145  theFinalElectronPolarization.setX(Stokes_S1);
146  theFinalElectronPolarization.setY(Stokes_S2);
147  theFinalElectronPolarization.setZ(Stokes_S3);
148 
149  if(theFinalElectronPolarization.mag2()>1.) {
150  G4cout<<" WARNING in pol-conv theFinalElectronPolarization \n";
151  G4cout
152  <<"\t"<<theFinalElectronPolarization
153  <<"\t GG\t"<<GG
154  <<"\t delta\t"<<delta
155  <<G4endl;
156  theFinalElectronPolarization.setX(0.);
157  theFinalElectronPolarization.setY(0.);
158  theFinalElectronPolarization.setZ(Stokes_S3);
159  if(Stokes_S3>1.) theFinalElectronPolarization.setZ(1.);
160  }
161 
162 
163  G4double L_Lepton2 = GammaE * ((Lept1E - Lept0E) * (3. + 2. * GG)+2 * Lept0E * (1. + 4. * u2 * Xsi2 * GG))/I_Lepton;
164 
165  G4double T_Lepton2 = 4. * GammaE * Lept0E * Xsi * u * (1. - 2. * Xsi) * GG / I_Lepton ;
166 
167  G4double Stokes_SS1 = (Stokes_P3 * T_Lepton2) ;
168  G4double Stokes_SS2 = 0.;
169  G4double Stokes_SS3 = (Stokes_P3 * L_Lepton2) ;
170 
171  theFinalPositronPolarization.SetPhoton();
172 
173  theFinalPositronPolarization.setX(Stokes_SS1);
174  theFinalPositronPolarization.setY(Stokes_SS2);
175  theFinalPositronPolarization.setZ(Stokes_SS3);
176 
177  if(theFinalPositronPolarization.mag2()>1.) {
178  G4cout<<" WARNING in pol-conv theFinalPositronPolarization \n";
179  G4cout
180  <<"\t"<<theFinalPositronPolarization
181  <<"\t GG\t"<<GG
182  <<"\t delta\t"<<delta
183  <<G4endl;
184  }
185 }
G4int
int G4int
Definition: G4Types.hh:78
CLHEP::Hep3Vector::setY
void setY(double)
CLHEP::Hep3Vector::setZ
void setZ(double)
CLHEP::Hep3Vector::setX
void setX(double)
G4cout
G4GLOB_DLL std::ostream G4cout
python.hepunit.electron_mass_c2
float electron_mass_c2
Definition: hepunit.py:274
CLHEP::Hep3Vector::mag2
double mag2() const
G4endl
#define G4endl
Definition: G4ios.hh:61
G4double
double G4double
Definition: G4Types.hh:76

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G4double G4PolarizedPairProductionCrossSection::XSection ( const G4StokesVector &  pol2,
const G4StokesVector &  pol3 
)
overridevirtual

Implements G4VPolarizedCrossSection.

Definition at line 187 of file G4PolarizedPairProductionCrossSection.cc.

189 {
190  G4cout<<"ERROR dummy routine G4PolarizedPairProductionCrossSection::XSection called \n";
191  return 0.;
192 }
G4cout
G4GLOB_DLL std::ostream G4cout
The documentation for this class was generated from the following files: