1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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7 | // * conditions of the Geant4 Software License, included in the file * |
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8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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9 | // * include a list of copyright holders. * |
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10 | // * * |
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11 | // * Neither the authors of this software system, nor their employing * |
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12 | // * institutes,nor the agencies providing financial support for this * |
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13 | // * work make any representation or warranty, express or implied, * |
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14 | // * regarding this software system or assume any liability for its * |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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16 | // * for the full disclaimer and the limitation of liability. * |
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17 | // * * |
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18 | // * This code implementation is the result of the scientific and * |
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19 | // * technical work of the GEANT4 collaboration. * |
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20 | // * By using, copying, modifying or distributing the software (or * |
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21 | // * any work based on the software) you agree to acknowledge its * |
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22 | // * use in resulting scientific publications, and indicate your * |
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23 | // * acceptance of all terms of the Geant4 Software license. * |
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24 | // ******************************************************************** |
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25 | // |
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26 | // |
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27 | // $Id: G4RToEConvForProton.cc,v 1.6 2009/09/14 07:27:46 kurasige Exp $ |
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28 | // GEANT4 tag $Name: geant4-09-03-cand-01 $ |
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29 | // |
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30 | // |
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31 | // -------------------------------------------------------------- |
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32 | // GEANT 4 class implementation file/ History: |
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33 | // 5 Oct. 2002, H.Kuirashige : Structure created based on object model |
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34 | // -------------------------------------------------------------- |
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35 | |
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36 | #include "G4RToEConvForProton.hh" |
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37 | #include "G4ParticleTable.hh" |
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38 | #include "G4Material.hh" |
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39 | #include "G4PhysicsLogVector.hh" |
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40 | |
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41 | #include "G4ios.hh" |
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42 | |
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43 | G4RToEConvForProton::G4RToEConvForProton() : G4VRangeToEnergyConverter() |
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44 | { |
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45 | theParticle = G4ParticleTable::GetParticleTable()->FindParticle("proton"); |
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46 | if (theParticle ==0) { |
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47 | #ifdef G4VERBOSE |
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48 | if (GetVerboseLevel()>0) { |
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49 | G4cout << " G4RToEConvForProton::G4RToEConvForProton() "; |
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50 | G4cout << " proton is not defined !!" << G4endl; |
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51 | } |
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52 | #endif |
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53 | } |
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54 | } |
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55 | |
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56 | G4RToEConvForProton::~G4RToEConvForProton() |
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57 | { |
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58 | } |
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59 | |
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60 | |
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61 | G4double G4RToEConvForProton::Convert(G4double rangeCut, const G4Material* ) |
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62 | { |
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63 | // Simple formula |
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64 | // range = Ekin/(100*keV)*(1*mm); |
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65 | return (rangeCut/(1.0*mm)) * (100.0*keV); |
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66 | } |
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67 | |
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68 | |
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69 | // ********************************************************************** |
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70 | // ************************* ComputeLoss ******************************** |
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71 | // ********************************************************************** |
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72 | G4double G4RToEConvForProton::ComputeLoss(G4double AtomicNumber, |
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73 | G4double KineticEnergy) const |
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74 | { |
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75 | // calculate dE/dx |
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76 | |
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77 | static G4double Z; |
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78 | static G4double ionpot, tau0, taum, taul, ca, cba, cc; |
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79 | |
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80 | G4double z2Particle = theParticle->GetPDGCharge()/eplus; |
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81 | z2Particle *= z2Particle; |
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82 | if (z2Particle < 0.1) return 0.0; |
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83 | |
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84 | if( std::fabs(AtomicNumber-Z)>0.1 ){ |
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85 | // recalculate constants |
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86 | Z = AtomicNumber; |
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87 | G4double Z13 = std::exp(std::log(Z)/3.); |
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88 | tau0 = 0.1*Z13*MeV/proton_mass_c2; |
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89 | taum = 0.035*Z13*MeV/proton_mass_c2; |
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90 | taul = 2.*MeV/proton_mass_c2; |
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91 | ionpot = 1.6e-5*MeV*std::exp(0.9*std::log(Z)); |
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92 | cc = (taul+1.)*(taul+1.)*std::log(2.*electron_mass_c2*taul*(taul+2.)/ionpot)/(taul*(taul+2.))-1.; |
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93 | cc = 2.*twopi_mc2_rcl2*Z*cc*std::sqrt(taul); |
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94 | ca = cc/((1.-0.5*std::sqrt(tau0/taum))*tau0); |
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95 | cba = -0.5/std::sqrt(taum); |
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96 | } |
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97 | |
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98 | G4double tau = KineticEnergy/theParticle->GetPDGMass(); |
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99 | G4double dEdx; |
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100 | if ( tau <= tau0 ) { |
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101 | dEdx = ca*(std::sqrt(tau)+cba*tau); |
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102 | } else { |
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103 | if( tau <= taul ) { |
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104 | dEdx = cc/std::sqrt(tau); |
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105 | } else { |
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106 | dEdx = (tau+1.)*(tau+1.)* |
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107 | std::log(2.*electron_mass_c2*tau*(tau+2.)/ionpot)/(tau*(tau+2.))-1.; |
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108 | dEdx = 2.*twopi_mc2_rcl2*Z*dEdx; |
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109 | } |
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110 | } |
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111 | return dEdx*z2Particle ; |
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112 | } |
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113 | |
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114 | |
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115 | // ********************************************************************** |
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116 | // ************************* Reset ******************************** |
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117 | // ********************************************************************** |
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118 | void G4RToEConvForProton::Reset() |
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119 | { |
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120 | // do nothing because loss tables and range vectors are not used |
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121 | return; |
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122 | } |
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