Gabriele Cosmo
125 lines
4.5 KiB
C++
125 lines
4.5 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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//
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//
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//
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// --------------------------------------------------------------
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// GEANT 4 class implementation file/ History:
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// 5 Oct. 2002, H.Kuirashige : Structure created based on object model
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// --------------------------------------------------------------
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#include "G4RToEConvForProton.hh"
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#include "G4ParticleTable.hh"
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#include "G4Material.hh"
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#include "G4PhysicsLogVector.hh"
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#include "G4ios.hh"
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#include "G4PhysicalConstants.hh"
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#include "G4SystemOfUnits.hh"
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G4RToEConvForProton::G4RToEConvForProton()
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: G4VRangeToEnergyConverter(),
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Mass(0.0),
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Z(-1.),
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tau0(0.0), taul(0.0), taum(0.0),
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ionpot(0.0),
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ca(0.0), cba(0.0), cc(0.0)
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{
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theParticle = G4ParticleTable::GetParticleTable()->FindParticle("proton");
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if (theParticle ==0) {
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#ifdef G4VERBOSE
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if (GetVerboseLevel()>0) {
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G4cout << " G4RToEConvForProton::G4RToEConvForProton() ";
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G4cout << " proton is not defined !!" << G4endl;
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}
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#endif
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} else {
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Mass = theParticle->GetPDGMass();
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}
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}
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G4RToEConvForProton::~G4RToEConvForProton()
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{
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}
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G4double G4RToEConvForProton::Convert(G4double rangeCut, const G4Material* )
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{
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// Simple formula
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// range = Ekin/(100*keV)*(1*mm);
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return (rangeCut/(1.0*mm)) * (100.0*keV);
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}
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// **********************************************************************
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// ************************* ComputeLoss ********************************
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// **********************************************************************
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G4double G4RToEConvForProton::ComputeLoss(G4double AtomicNumber,
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G4double KineticEnergy)
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{
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// calculate dE/dx
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const G4double z2Particle = 1.0;
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if( std::fabs(AtomicNumber-Z)>0.1 ){
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// recalculate constants
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Z = AtomicNumber;
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G4double Z13 = std::exp(std::log(Z)/3.);
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tau0 = 0.1*Z13*MeV/proton_mass_c2;
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taum = 0.035*Z13*MeV/proton_mass_c2;
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taul = 2.*MeV/proton_mass_c2;
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ionpot = 1.6e-5*MeV*std::exp(0.9*std::log(Z));
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cc = (taul+1.)*(taul+1.)*std::log(2.*electron_mass_c2*taul*(taul+2.)/ionpot)/(taul*(taul+2.))-1.;
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cc = 2.*twopi_mc2_rcl2*Z*cc*std::sqrt(taul);
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ca = cc/((1.-0.5*std::sqrt(tau0/taum))*tau0);
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cba = -0.5/std::sqrt(taum);
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}
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G4double tau = KineticEnergy/Mass;
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G4double dEdx;
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if ( tau <= tau0 ) {
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dEdx = ca*(std::sqrt(tau)+cba*tau);
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} else {
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if( tau <= taul ) {
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dEdx = cc/std::sqrt(tau);
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} else {
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dEdx = (tau+1.)*(tau+1.)*
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std::log(2.*electron_mass_c2*tau*(tau+2.)/ionpot)/(tau*(tau+2.))-1.;
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dEdx = 2.*twopi_mc2_rcl2*Z*dEdx;
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}
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}
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return dEdx*z2Particle ;
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}
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// **********************************************************************
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// ************************* Reset ********************************
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// **********************************************************************
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void G4RToEConvForProton::Reset()
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{
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// do nothing because loss tables and range vectors are not used
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return;
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}
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