| [819] | 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 | // $Id: G4NeutronKiller.hh,v 1.2 2007/06/01 07:53:26 ahoward Exp $
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| [1196] | 27 | // GEANT4 tag $Name: geant4-09-03-cand-01 $
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| [819] | 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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