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Please see the license in the file LICENSE and URL above * 16 // * for the full disclaimer and the limitatio 16 // * for the full disclaimer and the limitation of liability. * 17 // * 17 // * * 18 // * This code implementation is the result 18 // * This code implementation is the result of the scientific and * 19 // * technical work of the GEANT4 collaboratio 19 // * technical work of the GEANT4 collaboration. * 20 // * By using, copying, modifying or distri 20 // * By using, copying, modifying or distributing the software (or * 21 // * any work based on the software) you ag 21 // * any work based on the software) you agree to acknowledge its * 22 // * use in resulting scientific publicati 22 // * use in resulting scientific publications, and indicate your * 23 // * acceptance of all terms of the Geant4 Sof 23 // * acceptance of all terms of the Geant4 Software license. * 24 // ******************************************* 24 // ******************************************************************** 25 // 25 // 26 // G4EqMagElectricField implementation << 27 // 26 // 28 // This is the standard right-hand side for eq << 27 // $Id: G4EqMagElectricField.cc,v 1.13 2006/06/29 18:23:46 gunter Exp $ >> 28 // GEANT4 tag $Name: geant4-08-03-patch-02 $ 29 // 29 // 30 // The only case another is required is when u << 31 // frame ... or extending the class to include << 32 // e.g., an electric field << 33 // 30 // 34 // Created: V.Grichine, 10.11.1998 << 31 // This is the standard right-hand side for equation of motion. >> 32 // >> 33 // The only case another is required is when using a moving reference >> 34 // frame ... or extending the class to include additional Forces, >> 35 // eg an electric field >> 36 // >> 37 // 10.11.98 V.Grichine >> 38 // 35 // ------------------------------------------- 39 // ------------------------------------------------------------------- 36 40 37 #include "G4EqMagElectricField.hh" 41 #include "G4EqMagElectricField.hh" 38 #include "globals.hh" 42 #include "globals.hh" 39 #include "G4PhysicalConstants.hh" << 40 #include "G4SystemOfUnits.hh" << 41 << 42 G4EqMagElectricField::G4EqMagElectricField(G4E << 43 : G4EquationOfMotion( emField ) << 44 { << 45 } << 46 << 47 G4EqMagElectricField::~G4EqMagElectricField() << 48 43 49 void 44 void 50 G4EqMagElectricField::SetChargeMomentumMass(G4 << 45 G4EqMagElectricField::SetChargeMomentumMass(G4double particleCharge, // e+ units 51 G4 << 46 G4double, 52 G4 47 G4double particleMass) 53 { 48 { 54 G4double pcharge = particleCharge.GetCharge << 49 fElectroMagCof = eplus*particleCharge*c_light ; 55 fElectroMagCof = eplus*pcharge*c_light ; << 56 fMassCof = particleMass*particleMass ; 50 fMassCof = particleMass*particleMass ; 57 } 51 } 58 52 >> 53 >> 54 59 void 55 void 60 G4EqMagElectricField::EvaluateRhsGivenB(const 56 G4EqMagElectricField::EvaluateRhsGivenB(const G4double y[], 61 const << 57 const G4double Field[], 62 << 58 G4double dydx[] ) const 63 { 59 { >> 60 64 // Components of y: 61 // Components of y: 65 // 0-2 dr/ds, 62 // 0-2 dr/ds, 66 // 3-5 dp/ds - momentum derivatives 63 // 3-5 dp/ds - momentum derivatives 67 64 68 G4double pSquared = y[3]*y[3] + y[4]*y[4] + 65 G4double pSquared = y[3]*y[3] + y[4]*y[4] + y[5]*y[5] ; 69 66 70 G4double Energy = std::sqrt( pSquared + f 67 G4double Energy = std::sqrt( pSquared + fMassCof ); 71 G4double cof2 = Energy/c_light ; 68 G4double cof2 = Energy/c_light ; 72 69 73 G4double pModuleInverse = 1.0/std::sqrt(pS 70 G4double pModuleInverse = 1.0/std::sqrt(pSquared) ; 74 71 >> 72 // G4double inverse_velocity = Energy * c_light * pModuleInverse; 75 G4double inverse_velocity = Energy * pModul 73 G4double inverse_velocity = Energy * pModuleInverse / c_light; 76 74 77 G4double cof1 = fElectroMagCof*pModuleI 75 G4double cof1 = fElectroMagCof*pModuleInverse ; 78 76 >> 77 // G4double vDotE = y[3]*Field[3] + y[4]*Field[4] + y[5]*Field[5] ; >> 78 >> 79 79 dydx[0] = y[3]*pModuleInverse ; 80 dydx[0] = y[3]*pModuleInverse ; 80 dydx[1] = y[4]*pModuleInverse ; 81 dydx[1] = y[4]*pModuleInverse ; 81 dydx[2] = y[5]*pModuleInverse ; 82 dydx[2] = y[5]*pModuleInverse ; 82 83 83 dydx[3] = cof1*(cof2*Field[3] + (y[4]*Field 84 dydx[3] = cof1*(cof2*Field[3] + (y[4]*Field[2] - y[5]*Field[1])) ; 84 85 85 dydx[4] = cof1*(cof2*Field[4] + (y[5]*Field 86 dydx[4] = cof1*(cof2*Field[4] + (y[5]*Field[0] - y[3]*Field[2])) ; 86 87 87 dydx[5] = cof1*(cof2*Field[5] + (y[3]*Field 88 dydx[5] = cof1*(cof2*Field[5] + (y[3]*Field[1] - y[4]*Field[0])) ; 88 89 89 dydx[6] = 0.;//not used << 90 << 91 // Lab Time of flight 90 // Lab Time of flight 92 // << 93 dydx[7] = inverse_velocity; 91 dydx[7] = inverse_velocity; 94 << 92 return ; 95 return; << 96 } 93 } 97 94