[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 | // |
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[1196] | 27 | // $Id: G4RToEConvForProton.cc,v 1.6 2009/09/14 07:27:46 kurasige Exp $ |
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[1228] | 28 | // GEANT4 tag $Name: geant4-09-03 $ |
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[819] | 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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[1196] | 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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