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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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24 | // ******************************************************************** |
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25 | // |
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26 | // $Id: G4NeutronKiller.hh,v 1.2 2007/06/01 07:53:26 ahoward Exp $ |
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27 | // GEANT4 tag $Name: geant4-09-02 $ |
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28 | // |
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29 | //--------------------------------------------------------------------------- |
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30 | // |
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31 | // ClassName: G4NeutronKiller |
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32 | // |
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33 | // Description: The process to kill neutrons to save CPU |
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34 | // |
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35 | // Author: V.Ivanchenko 26/09/00 for HARP software |
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36 | // |
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37 | //---------------------------------------------------------------------------- |
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38 | // |
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39 | // Class description: |
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40 | // |
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41 | // G4NeutronKiller allows to remove unwanted neutrons from simulation in |
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42 | // order to improve CPU performance. There are two parameters: |
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43 | // |
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44 | // 1) low energy threshold for neutron kinetic energy (default 0) |
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45 | // 2) time limit for neutron track (default DBL_MAX) |
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46 | // |
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47 | // These parameters can be changed via Set methods or by UI commands: |
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48 | // /physics_engine/neutron/energyCut |
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49 | // /physics_engine/neutron/timeLimit |
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50 | // |
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51 | // If a neutron track is killed no energy deposition is added to the step |
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52 | // |
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53 | |
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54 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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55 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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56 | |
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57 | #ifndef NeutronKiller_h |
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58 | #define NeutronKiller_h 1 |
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59 | |
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60 | #include "globals.hh" |
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61 | #include "G4VDiscreteProcess.hh" |
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62 | #include "G4ParticleDefinition.hh" |
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63 | #include "G4Step.hh" |
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64 | #include "G4Track.hh" |
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65 | |
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66 | class G4NeutronKillerMessenger; |
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67 | |
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68 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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69 | |
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70 | class G4NeutronKiller : public G4VDiscreteProcess |
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71 | { |
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72 | public: |
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73 | |
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74 | G4NeutronKiller(const G4String& processName = "nKiller", |
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75 | G4ProcessType aType = fNotDefined); |
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76 | |
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77 | virtual ~G4NeutronKiller(); |
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78 | |
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79 | G4bool IsApplicable(const G4ParticleDefinition&); |
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80 | |
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81 | void SetTimeLimit(G4double); |
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82 | |
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83 | void SetKinEnergyLimit(G4double); |
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84 | |
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85 | G4double PostStepGetPhysicalInteractionLength( const G4Track& track, |
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86 | G4double previousStepSize, |
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87 | G4ForceCondition* condition); |
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88 | |
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89 | G4VParticleChange* PostStepDoIt(const G4Track&, const G4Step&); |
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90 | |
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91 | G4double GetMeanFreePath(const G4Track&, G4double,G4ForceCondition*); |
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92 | |
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93 | private: |
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94 | |
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95 | // hide assignment operator as private |
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96 | G4NeutronKiller(const G4NeutronKiller&); |
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97 | G4NeutronKiller& operator = (const G4NeutronKiller &right); |
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98 | |
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99 | G4double kinEnergyThreshold; |
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100 | G4double timeThreshold; |
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101 | |
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102 | G4NeutronKillerMessenger* pMess; |
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103 | }; |
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104 | |
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105 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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106 | |
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107 | inline G4double G4NeutronKiller::PostStepGetPhysicalInteractionLength( |
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108 | const G4Track& aTrack, |
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109 | G4double, G4ForceCondition* condition) |
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110 | { |
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111 | // condition is set to "Not Forced" |
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112 | *condition = NotForced; |
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113 | |
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114 | G4double limit = DBL_MAX; |
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115 | if(aTrack.GetGlobalTime() > timeThreshold || |
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116 | aTrack.GetKineticEnergy() < kinEnergyThreshold) limit = 0.0; |
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117 | return limit; |
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118 | } |
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119 | |
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120 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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121 | |
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122 | inline G4double G4NeutronKiller::GetMeanFreePath(const G4Track&,G4double, |
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123 | G4ForceCondition*) |
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124 | { |
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125 | return DBL_MAX; |
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126 | } |
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127 | |
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128 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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129 | |
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130 | inline G4VParticleChange* G4NeutronKiller::PostStepDoIt(const G4Track& aTrack, |
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131 | const G4Step&) |
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132 | { |
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133 | pParticleChange->Initialize(aTrack); |
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134 | pParticleChange->ProposeTrackStatus(fStopAndKill); |
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135 | return pParticleChange; |
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136 | } |
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137 | |
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138 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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139 | |
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140 | #endif |
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141 | |
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