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2 | // ******************************************************************** |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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19 | // * technical work of the GEANT4 collaboration. * |
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24 | // ******************************************************************** |
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25 | // |
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26 | // $Id: G4BetheBlochModel.hh,v 1.20 2009/04/23 17:44:43 vnivanch Exp $ |
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27 | // GEANT4 tag $Name: geant4-09-03 $ |
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28 | // |
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29 | // ------------------------------------------------------------------- |
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30 | // |
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31 | // GEANT4 Class header file |
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32 | // |
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33 | // |
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34 | // File name: G4BetheBlochModel |
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35 | // |
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36 | // Author: Vladimir Ivanchenko on base of Laszlo Urban code |
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37 | // |
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38 | // Creation date: 03.01.2002 |
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39 | // |
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40 | // Modifications: |
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41 | // |
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42 | // 23-12-02 V.Ivanchenko change interface in order to moveto cut per region |
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43 | // 24-01-03 Make models region aware (V.Ivanchenko) |
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44 | // 13-02-03 Add name (V.Ivanchenko) |
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45 | // 12-11-03 Fix for GenericIons (V.Ivanchenko) |
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46 | // 24-03-05 Add G4EmCorrections (V.Ivanchenko) |
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47 | // 11-04-05 Major optimisation of internal interfaces (V.Ivanchenko) |
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48 | // 11-04-04 Move MaxSecondaryEnergy to models (V.Ivanchenko) |
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49 | // 11-02-06 ComputeCrossSectionPerElectron, ComputeCrossSectionPerAtom (mma) |
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50 | // 12-08-08 Added methods GetParticleCharge, GetChargeSquareRatio, |
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51 | // CorrectionsAlongStep needed for ions(V.Ivanchenko) |
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52 | |
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53 | // |
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54 | // Class Description: |
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55 | // |
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56 | // Implementation of Bethe-Bloch model of energy loss and |
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57 | // delta-electron production by heavy charged particles |
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58 | |
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59 | // ------------------------------------------------------------------- |
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60 | // |
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61 | |
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62 | #ifndef G4BetheBlochModel_h |
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63 | #define G4BetheBlochModel_h 1 |
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64 | |
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65 | #include "G4VEmModel.hh" |
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66 | #include "G4NistManager.hh" |
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67 | |
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68 | class G4EmCorrections; |
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69 | class G4ParticleChangeForLoss; |
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70 | |
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71 | class G4BetheBlochModel : public G4VEmModel |
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72 | { |
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73 | |
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74 | public: |
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75 | |
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76 | G4BetheBlochModel(const G4ParticleDefinition* p = 0, |
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77 | const G4String& nam = "BetheBloch"); |
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78 | |
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79 | virtual ~G4BetheBlochModel(); |
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80 | |
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81 | virtual void Initialise(const G4ParticleDefinition*, const G4DataVector&); |
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82 | |
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83 | virtual G4double MinEnergyCut(const G4ParticleDefinition*, |
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84 | const G4MaterialCutsCouple*); |
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85 | |
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86 | virtual G4double ComputeCrossSectionPerElectron( |
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87 | const G4ParticleDefinition*, |
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88 | G4double kineticEnergy, |
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89 | G4double cutEnergy, |
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90 | G4double maxEnergy); |
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91 | |
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92 | virtual G4double ComputeCrossSectionPerAtom( |
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93 | const G4ParticleDefinition*, |
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94 | G4double kineticEnergy, |
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95 | G4double Z, G4double A, |
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96 | G4double cutEnergy, |
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97 | G4double maxEnergy); |
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98 | |
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99 | virtual G4double CrossSectionPerVolume(const G4Material*, |
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100 | const G4ParticleDefinition*, |
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101 | G4double kineticEnergy, |
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102 | G4double cutEnergy, |
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103 | G4double maxEnergy); |
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104 | |
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105 | virtual G4double ComputeDEDXPerVolume(const G4Material*, |
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106 | const G4ParticleDefinition*, |
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107 | G4double kineticEnergy, |
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108 | G4double cutEnergy); |
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109 | |
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110 | virtual G4double GetChargeSquareRatio(const G4ParticleDefinition* p, |
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111 | const G4Material* mat, |
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112 | G4double kineticEnergy); |
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113 | |
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114 | virtual G4double GetParticleCharge(const G4ParticleDefinition* p, |
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115 | const G4Material* mat, |
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116 | G4double kineticEnergy); |
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117 | |
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118 | virtual void CorrectionsAlongStep(const G4MaterialCutsCouple*, |
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119 | const G4DynamicParticle*, |
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120 | G4double& eloss, |
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121 | G4double& niel, |
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122 | G4double length); |
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123 | |
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124 | virtual void SampleSecondaries(std::vector<G4DynamicParticle*>*, |
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125 | const G4MaterialCutsCouple*, |
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126 | const G4DynamicParticle*, |
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127 | G4double tmin, |
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128 | G4double maxEnergy); |
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129 | |
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130 | protected: |
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131 | |
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132 | virtual G4double MaxSecondaryEnergy(const G4ParticleDefinition*, |
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133 | G4double kinEnergy); |
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134 | |
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135 | private: |
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136 | |
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137 | inline void SetupParameters(); |
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138 | |
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139 | inline void SetParticle(const G4ParticleDefinition* p); |
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140 | |
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141 | inline void SetGenericIon(const G4ParticleDefinition* p); |
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142 | |
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143 | // hide assignment operator |
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144 | G4BetheBlochModel & operator=(const G4BetheBlochModel &right); |
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145 | G4BetheBlochModel(const G4BetheBlochModel&); |
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146 | |
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147 | const G4ParticleDefinition* particle; |
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148 | const G4Material* currentMaterial; |
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149 | G4ParticleDefinition* theElectron; |
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150 | G4EmCorrections* corr; |
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151 | G4ParticleChangeForLoss* fParticleChange; |
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152 | G4NistManager* nist; |
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153 | |
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154 | G4double mass; |
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155 | G4double tlimit; |
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156 | G4double spin; |
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157 | G4double magMoment2; |
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158 | G4double chargeSquare; |
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159 | G4double ratio; |
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160 | G4double formfact; |
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161 | G4double twoln10; |
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162 | G4double bg2lim; |
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163 | G4double taulim; |
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164 | G4double corrFactor; |
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165 | G4bool isIon; |
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166 | G4bool isInitialised; |
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167 | }; |
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168 | |
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169 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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170 | |
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171 | inline void G4BetheBlochModel::SetupParameters() |
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172 | { |
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173 | mass = particle->GetPDGMass(); |
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174 | spin = particle->GetPDGSpin(); |
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175 | G4double q = particle->GetPDGCharge()/eplus; |
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176 | chargeSquare = q*q; |
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177 | ratio = electron_mass_c2/mass; |
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178 | G4double magmom = particle->GetPDGMagneticMoment()*mass/(0.5*eplus*hbar_Planck*c_squared); |
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179 | magMoment2 = magmom*magmom - 1.0; |
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180 | formfact = 0.0; |
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181 | if(particle->GetLeptonNumber() == 0) { |
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182 | G4double x = 0.8426*GeV; |
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183 | if(spin == 0.0 && mass < GeV) {x = 0.736*GeV;} |
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184 | else if(mass > GeV) { |
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185 | x /= nist->GetZ13(mass/proton_mass_c2); |
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186 | // tlimit = 51.2*GeV*A13[iz]*A13[iz]; |
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187 | } |
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188 | formfact = 2.0*electron_mass_c2/(x*x); |
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189 | tlimit = 2.0/formfact; |
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190 | } |
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191 | } |
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192 | |
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193 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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194 | |
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195 | inline void G4BetheBlochModel::SetParticle(const G4ParticleDefinition* p) |
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196 | { |
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197 | if(particle != p) { |
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198 | particle = p; |
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199 | if (p->GetPDGCharge()/eplus > 1.5 && p->GetBaryonNumber() > 2) isIon = true; |
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200 | SetupParameters(); |
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201 | } |
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202 | } |
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203 | |
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204 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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205 | |
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206 | inline void G4BetheBlochModel::SetGenericIon(const G4ParticleDefinition* p) |
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207 | { |
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208 | if(p && particle != p) { |
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209 | if(p->GetParticleName() == "GenericIon") isIon = true; |
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210 | } |
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211 | } |
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212 | |
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213 | #endif |
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