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Please see the license in the file LICENSE and URL above * // * for the full disclaimer and the limitation of liability. * // * * // * This code implementation is the result of the scientific and * // * technical work of the GEANT4 collaboration. * // * By using, copying, modifying or distributing the software (or * // * any work based on the software) you agree to acknowledge its * // * use in resulting scientific publications, and indicate your * // * acceptance of all terms of the Geant4 Software license. * // ******************************************************************** // // $Id: G4PolarizedBremsstrahlungCrossSection.cc,v 1.4 2007/11/01 17:32:34 schaelic Exp $ // GEANT4 tag $Name: geant4-09-04-beta-01 $ // // ------------------------------------------------------------------- // // GEANT4 Class file // // // File name: G4PolarizedBremsstrahlungCrossSection // // Author: Andreas Schaelicke on the base of Karim Laihems code // // Creation date: 16.08.2006 // #include "G4PolarizedBremsstrahlungCrossSection.hh" //#include "G4ePolarizedBremsstrahlungModel.hh" //#include "G4Element.hh" G4bool G4PolarizedBremsstrahlungCrossSection::scrnInitialized=false; G4double G4PolarizedBremsstrahlungCrossSection::SCRN [3][20]; // screening function lookup table; void G4PolarizedBremsstrahlungCrossSection::InitializeMe() { if (!scrnInitialized) { SCRN [1][1]= 0.5 ; SCRN [2][1] = 0.0145; SCRN [1][2]= 1.0 ; SCRN [2][2] = 0.0490; SCRN [1][3]= 2.0 ; SCRN [2][3] = 0.1400; SCRN [1][4]= 4.0 ; SCRN [2][4] = 0.3312; SCRN [1][5]= 8.0 ; SCRN [2][5] = 0.6758; SCRN [1][6]= 15.0 ; SCRN [2][6] = 1.126; SCRN [1][7]= 20.0 ; SCRN [2][7] = 1.367; SCRN [1][8]= 25.0 ; SCRN [2][8] = 1.564; SCRN [1][9]= 30.0 ; SCRN [2][9] = 1.731; SCRN [1][10]= 35.0 ; SCRN [2][10]= 1.875; SCRN [1][11]= 40.0 ; SCRN [2][11]= 2.001; SCRN [1][12]= 45.0 ; SCRN [2][12]= 2.114; SCRN [1][13]= 50.0 ; SCRN [2][13]= 2.216; SCRN [1][14]= 60.0 ; SCRN [2][14]= 2.393; SCRN [1][15]= 70.0 ; SCRN [2][15]= 2.545; SCRN [1][16]= 80.0 ; SCRN [2][16]= 2.676; SCRN [1][17]= 90.0 ; SCRN [2][17]= 2.793; SCRN [1][18]= 100.0 ; SCRN [2][18]= 2.897; SCRN [1][19]= 120.0 ; SCRN [2][19]= 3.078; scrnInitialized=true; } } G4PolarizedBremsstrahlungCrossSection::G4PolarizedBremsstrahlungCrossSection() { InitializeMe(); } void G4PolarizedBremsstrahlungCrossSection::Initialize( G4double aLept0E, G4double aGammaE, G4double sintheta, const G4StokesVector & beamPol, const G4StokesVector & /*p1*/, G4int /*flag*/) { // G4cout<<"G4PolarizedBremsstrahlungCrossSection::Initialize \n" // <<"lepE = "<SelectedAtom(); // ******* Gamma Transvers Momentum G4double TMom = std::sqrt(Lept0E2 -1.)* sintheta; G4double u = TMom , u2 =u * u ; G4double Xsi = 1./(1.+u2) , Xsi2 = Xsi * Xsi ; // G4double theZ = theSelectedElement->GetZ(); // G4double fCoul = theSelectedElement->GetfCoulomb(); G4double delta = 12. * std::pow(theZ, 1./3.) * Lept0E * Lept1E * Xsi / (121. * GammaE); G4double GG=0.; if(delta < 0.5) { GG = std::log(2.* Lept0E * Lept1E / GammaE) - 2. - fCoul; } else if ( delta < 120) { for (G4int j=2; j<=19; j++) { if(SCRN[1][j] >= delta) { GG =std::log(2 * Lept0E * Lept1E / GammaE) - 2 - fCoul -(SCRN[2][j-1]+(delta-SCRN[1][j-1])*(SCRN[2][j]-SCRN[2][j-1]) /(SCRN[1][j]-SCRN[1][j-1])); break; } } } else { G4double alpha_sc = (111 * std::pow(theZ, -1./3.)) / Xsi; GG = std::log(alpha_sc)- 2 - fCoul; } if(GG<-1) GG=-1; // *KL* do we need this ?! G4double I_Lept = (Lept0E2 + Lept1E2) * (3.+2.*GG) - 2 * Lept0E * Lept1E * (1. + 4. * u2 * Xsi2 * GG); G4double F_Lept = Lept1E * 4. * GammaE * u * Xsi * (1. - 2 * Xsi) * GG / I_Lept; G4double E_Lept = Lept0E * 4. * GammaE * u * Xsi * (2. * Xsi - 1.) * GG / I_Lept; G4double M_Lept = 4. * Lept0E * Lept1E * (1. + GG - 2. * Xsi2 * u2 * GG) / I_Lept ; G4double P_Lept = GammaE2 * (1. + 8. * GG * (Xsi - 0.5)*(Xsi - 0.5)) / I_Lept ; G4double Stokes_SS1 = M_Lept * Stokes_S1 + E_Lept * Stokes_S3; G4double Stokes_SS2 = M_Lept * Stokes_S2 ; G4double Stokes_SS3 = (M_Lept + P_Lept) * Stokes_S3 + F_Lept * Stokes_S1; theFinalLeptonPolarization.setX(Stokes_SS1); theFinalLeptonPolarization.setY(Stokes_SS2); theFinalLeptonPolarization.setZ(Stokes_SS3); if(theFinalLeptonPolarization.mag2()>1) { G4cout<<" WARNING in pol-brem theFinalLeptonPolarization \n"; G4cout <<"\t"<1) theFinalLeptonPolarization.setZ(1); } G4double I_Gamma = (Lept0E2 + Lept1E2)*(3+2*GG) - 2 * Lept0E * Lept1E * (1 + 4 * u2 * Xsi2 * GG); G4double D_Gamma = 8 * Lept0E * Lept1E * u2 * Xsi2 * GG / I_Gamma; G4double L_Gamma = GammaE * ((Lept0E + Lept1E) * (3 + 2 * GG) - 2 * Lept1E * (1 + 4 * u2 * Xsi2 * GG))/I_Gamma; G4double T_Gamma = 4 * GammaE * Lept1E * Xsi * u * (2 * Xsi - 1) * GG / I_Gamma ; G4double Stokes_P1 = D_Gamma ; G4double Stokes_P2 = 0 ; G4double Stokes_P3 = (Stokes_S3*L_Gamma + Stokes_S1*T_Gamma) ; theFinalGammaPolarization.SetPhoton(); theFinalGammaPolarization.setX(Stokes_P1); theFinalGammaPolarization.setY(Stokes_P2); theFinalGammaPolarization.setZ(Stokes_P3); if(theFinalGammaPolarization.mag2()>1) { G4cout<<" WARNING in pol-brem theFinalGammaPolarization \n"; G4cout <<"\t"<