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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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9 | // * include a list of copyright holders. * |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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18 | // * This code implementation is the result of the scientific and * |
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24 | // ******************************************************************** |
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25 | // |
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26 | // |
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27 | // $Id: G4MagHelicalStepper.icc,v 1.13 2007/05/18 15:45:15 tnikitin Exp $ |
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28 | // GEANT4 tag $Name: HEAD $ |
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29 | // |
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30 | // Linear Step in regions of no field |
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31 | // |
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32 | // -------------------------------------------------------------------- |
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33 | |
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34 | inline void |
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35 | G4MagHelicalStepper::LinearStep( const G4double yIn[], |
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36 | G4double h, |
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37 | G4double yLinear[]) const |
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38 | { |
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39 | G4double momentum_val = std::sqrt(yIn[3]*yIn[3] + yIn[4]*yIn[4] + yIn[5]*yIn[5]) ; |
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40 | G4double inv_momentum = 1.0 / momentum_val ; |
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41 | G4double yDir[3]; |
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42 | // G4double h_div_momentum = 1.0 / momentum_val ; |
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43 | |
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44 | for( G4int i = 0; i < 3; i++ ) { |
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45 | yDir[i] = inv_momentum * yIn[i+3]; |
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46 | yLinear[i] = yIn[i] + h * yDir[i]; |
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47 | // yLinear[i] = yIn[i] + h_div_momentum * yIn[i+3]; |
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48 | yLinear[i+3] = yIn[i+3]; |
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49 | } |
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50 | } |
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51 | |
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52 | inline void |
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53 | G4MagHelicalStepper::MagFieldEvaluate(const G4double y[], |
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54 | G4ThreeVector& Bfield ) |
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55 | { |
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56 | G4double B[3]; |
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57 | GetEquationOfMotion()-> GetFieldValue(y, B); |
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58 | Bfield= G4ThreeVector( B[0], B[1], B[2] ); |
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59 | } |
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60 | |
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61 | inline G4double |
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62 | G4MagHelicalStepper::GetInverseCurve(const G4double Momentum, |
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63 | const G4double Bmag) |
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64 | { |
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65 | |
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66 | G4double inv_momentum = 1.0 / Momentum ; |
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67 | G4double particleCharge = fPtrMagEqOfMot->FCof() / (eplus*c_light); |
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68 | G4double fCoefficient = -fUnitConstant * particleCharge*inv_momentum; |
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69 | |
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70 | return fCoefficient*Bmag; |
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71 | } |
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72 | inline void G4MagHelicalStepper:: SetAngCurve(const G4double Ang) |
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73 | { |
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74 | fAngCurve=Ang; |
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75 | |
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76 | } |
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77 | |
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78 | inline G4double G4MagHelicalStepper:: GetAngCurve() const |
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79 | { |
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80 | return fAngCurve; |
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81 | |
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82 | } |
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83 | |
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84 | inline void G4MagHelicalStepper:: SetCurve(const G4double Curve) |
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85 | { |
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86 | frCurve=Curve; |
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87 | } |
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88 | |
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89 | inline G4double G4MagHelicalStepper:: GetCurve() const |
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90 | { |
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91 | return frCurve; |
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92 | |
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93 | } |
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94 | |
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95 | inline void G4MagHelicalStepper:: SetRadHelix(const G4double Rad) |
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96 | { |
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97 | frHelix=Rad; |
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98 | } |
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99 | |
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100 | inline G4double G4MagHelicalStepper:: GetRadHelix() const |
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101 | { |
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102 | return frHelix; |
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103 | |
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104 | } |
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105 | |
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106 | |
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107 | |
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108 | |
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