Gabriele Cosmo
115 lines
4.3 KiB
C++
115 lines
4.3 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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// G4RToEConvForElectron class implementation
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//
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// Author: H.Kurashige, 05 October 2002 - First implementation
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// --------------------------------------------------------------------
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#include "G4RToEConvForElectron.hh"
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#include "G4ParticleDefinition.hh"
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#include "G4ParticleTable.hh"
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#include "G4PhysicalConstants.hh"
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#include "G4SystemOfUnits.hh"
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#include "G4Pow.hh"
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#include "G4Log.hh"
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#include "G4Exp.hh"
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// --------------------------------------------------------------------
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G4RToEConvForElectron::G4RToEConvForElectron()
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: G4VRangeToEnergyConverter()
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{
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theParticle = G4ParticleTable::GetParticleTable()->FindParticle("e-");
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if (theParticle == nullptr )
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{
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#ifdef G4VERBOSE
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if (GetVerboseLevel()>0)
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{
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G4cout << "G4RToEConvForElectron::G4RToEConvForElectron() - ";
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G4cout << "Electron is not defined !!" << G4endl;
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}
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#endif
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}
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else
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{
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fPDG = theParticle->GetPDGEncoding();
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}
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}
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// --------------------------------------------------------------------
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G4RToEConvForElectron::~G4RToEConvForElectron()
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{}
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// --------------------------------------------------------------------
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G4double G4RToEConvForElectron::ComputeValue(const G4int Z,
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const G4double kinEnergy)
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{
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const G4double cbr1=0.02, cbr2=-5.7e-5, cbr3=1., cbr4=0.072;
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const G4double Tlow=10.*CLHEP::keV, Thigh=1.*CLHEP::GeV;
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const G4double taul = Tlow/CLHEP::electron_mass_c2;
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const G4double log05 = G4Log(0.5);
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const G4double taul12 = std::sqrt(taul);
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const G4double bremfactor = 0.1;
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const G4double Zlog = G4Pow::GetInstance()->logZ(Z);
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const G4double ionpot =
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1.6e-5*CLHEP::MeV*G4Exp(0.9*Zlog)/CLHEP::electron_mass_c2;
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const G4double ionpotlog = G4Log(ionpot);
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const G4double tau = kinEnergy/CLHEP::electron_mass_c2;
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G4double dEdx = 0.0;
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if(tau<taul)
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{
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G4double t1 = taul+1.;
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G4double t2 = taul+2.;
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G4double tsq = taul*taul;
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G4double beta2 = taul*t2/(t1*t1);
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G4double f = 1.-beta2+G4Log(tsq/2.)
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+(0.5+0.25*tsq+(1.+2.*taul)*log05)/(t1*t1);
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dEdx = Z*(G4Log(2.*taul+4.)-2.*ionpotlog+f)/beta2;
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dEdx *= taul12/std::sqrt(tau);
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}
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else
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{
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G4double t1 = tau+1.;
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G4double t2 = tau+2.;
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G4double tsq = tau*tau;
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G4double beta2 = tau*t2/(t1*t1);
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G4double f = 1.-beta2+G4Log(tsq/2.)
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+(0.5+0.25*tsq+(1.+2.*tau)*log05)/(t1*t1);
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dEdx = Z*(G4Log(2.*tau+4.)-2.*ionpotlog+f)/beta2;
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// loss from bremsstrahlung follows
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G4double cbrem = (cbr1+cbr2*Z)*(cbr3+cbr4*G4Log(kinEnergy/Thigh));
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dEdx += Z*(Z+1)*cbrem*bremfactor*tau/beta2;
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}
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return dEdx*CLHEP::twopi_mc2_rcl2;
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}
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// --------------------------------------------------------------------
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