| 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: geant4-09-04-beta-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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