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Gabriele Cosmo
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//
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// ********************************************************************
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// * DISCLAIMER *
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// * *
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// * The following disclaimer summarizes all the specific disclaimers *
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// * of contributors to this software. The specific disclaimers,which *
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// * govern, are listed with their locations in: *
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// * http://cern.ch/geant4/license *
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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. *
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// * *
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// * This code implementation is the intellectual property of the *
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// * GEANT4 collaboration. *
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// * By copying, distributing or modifying the Program (or any work *
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// * based on the Program) you indicate your acceptance of this *
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// * statement, and all its terms. *
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// ********************************************************************
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//
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// $Id: G4BetheBlochModel.cc,v 1.2 2004/12/01 19:37:14 vnivanch Exp $
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// GEANT4 tag $Name: geant4-07-00-cand-03 $
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//
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// -------------------------------------------------------------------
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//
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// GEANT4 Class header file
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//
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//
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// File name: G4BetheBlochModel
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//
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// Author: Vladimir Ivanchenko on base of Laszlo Urban code
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//
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// Creation date: 03.01.2002
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//
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// Modifications:
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//
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// 04-12-02 Fix problem of G4DynamicParticle constructor (V.Ivanchenko)
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// 23-12-02 Change interface in order to move to cut per region (V.Ivanchenko)
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// 27-01-03 Make models region aware (V.Ivanchenko)
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// 13-02-03 Add name (V.Ivanchenko)
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//
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// -------------------------------------------------------------------
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//
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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#include "G4BetheBlochModel.hh"
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#include "Randomize.hh"
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#include "G4Electron.hh"
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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using namespace std;
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G4BetheBlochModel::G4BetheBlochModel(const G4ParticleDefinition* p, const G4String& nam)
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: G4VEmModel(nam),
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particle(0),
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highKinEnergy(100.*TeV),
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lowKinEnergy(2.0*MeV),
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twoln10(2.0*log(10.0)),
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bg2lim(0.0169),
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taulim(8.4146e-3),
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isIon(false)
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{
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if(p) SetParticle(p);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4BetheBlochModel::~G4BetheBlochModel()
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{}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4BetheBlochModel::SetParticle(const G4ParticleDefinition* p)
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{
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if(particle != p) {
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particle = p;
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mass = particle->GetPDGMass();
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spin = particle->GetPDGSpin();
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G4double q = particle->GetPDGCharge()/eplus;
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chargeSquare = q*q;
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ratio = electron_mass_c2/mass;
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if(particle->GetParticleName() == "GenericIon") isIon = true;
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4BetheBlochModel::HighEnergyLimit(const G4ParticleDefinition* p)
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{
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if(!particle) SetParticle(p);
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return highKinEnergy;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4BetheBlochModel::LowEnergyLimit(const G4ParticleDefinition* p)
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{
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if(!particle) SetParticle(p);
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return lowKinEnergy;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4BetheBlochModel::MinEnergyCut(const G4ParticleDefinition*,
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const G4MaterialCutsCouple* couple)
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{
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return couple->GetMaterial()->GetIonisation()->GetMeanExcitationEnergy();
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4bool G4BetheBlochModel::IsInCharge(const G4ParticleDefinition* p)
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{
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if(!particle) SetParticle(p);
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return (p->GetPDGCharge() != 0.0 && p->GetPDGMass() > 10.*MeV);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4BetheBlochModel::Initialise(const G4ParticleDefinition* p,
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const G4DataVector&)
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{
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if(!particle) SetParticle(p);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4BetheBlochModel::ComputeDEDX(const G4MaterialCutsCouple* couple,
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const G4ParticleDefinition* p,
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G4double kineticEnergy,
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G4double cut)
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{
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G4double tmax = MaxSecondaryEnergy(p, kineticEnergy);
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G4double cutEnergy = min(cut,tmax);
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G4double tau = kineticEnergy/mass;
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G4double gam = tau + 1.0;
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G4double bg2 = tau * (tau+2.0);
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G4double beta2 = bg2/(gam*gam);
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const G4Material* material = couple->GetMaterial();
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G4double eexc = material->GetIonisation()->GetMeanExcitationEnergy();
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G4double eexc2 = eexc*eexc;
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G4double taul = material->GetIonisation()->GetTaul();
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G4double cden = material->GetIonisation()->GetCdensity();
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G4double mden = material->GetIonisation()->GetMdensity();
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G4double aden = material->GetIonisation()->GetAdensity();
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G4double x0den = material->GetIonisation()->GetX0density();
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G4double x1den = material->GetIonisation()->GetX1density();
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G4double* shellCorrectionVector =
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material->GetIonisation()->GetShellCorrectionVector();
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G4double eDensity = material->GetElectronDensity();
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G4double dedx = log(2.0*electron_mass_c2*bg2*cutEnergy/eexc2)-(1.0 + cutEnergy/tmax)*beta2;
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if(0.5 == spin) {
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G4double del = 0.5*cutEnergy/(kineticEnergy + mass);
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dedx += del*del;
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}
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// density correction
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G4double x = log(bg2)/twoln10;
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if ( x >= x0den ) {
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dedx -= twoln10*x - cden ;
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if ( x < x1den ) dedx -= aden*pow((x1den-x),mden) ;
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}
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// shell correction
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G4double sh = 0.0;
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x = 1.0;
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if ( bg2 > bg2lim ) {
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for (G4int k=0; k<3; k++) {
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x *= bg2 ;
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sh += shellCorrectionVector[k]/x;
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}
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} else {
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for (G4int k=0; k<3; k++) {
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x *= bg2lim ;
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sh += shellCorrectionVector[k]/x;
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}
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sh *= log(tau/taul)/log(taulim/taul);
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}
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dedx -= sh;
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// now compute the total ionization loss
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if (dedx < 0.0) dedx = 0.0 ;
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dedx *= twopi_mc2_rcl2*chargeSquare*eDensity/beta2;
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return dedx;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4BetheBlochModel::CrossSection(const G4MaterialCutsCouple* couple,
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const G4ParticleDefinition* p,
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G4double kineticEnergy,
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G4double cutEnergy,
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G4double maxKinEnergy)
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{
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G4double cross = 0.0;
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G4double tmax = MaxSecondaryEnergy(p, kineticEnergy);
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G4double maxEnergy = min(tmax,maxKinEnergy);
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if(cutEnergy < maxEnergy) {
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G4double totEnergy = kineticEnergy + mass;
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G4double energy2 = totEnergy*totEnergy;
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G4double beta2 = kineticEnergy*(kineticEnergy + 2.0*mass)/energy2;
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cross = 1.0/cutEnergy - 1.0/maxEnergy - beta2*log(maxEnergy/cutEnergy)/tmax;
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// +term for spin=1/2 particle
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if( 0.5 == spin ) cross += 0.5*(maxEnergy - cutEnergy)/energy2;
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cross *= twopi_mc2_rcl2*chargeSquare*
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(couple->GetMaterial()->GetElectronDensity())/beta2;
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}
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// G4cout << "BB: e= " << kineticEnergy << " tmin= " << cutEnergy << " tmax= " << tmax
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// << " cross= " << cross << G4endl;
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return cross;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4DynamicParticle* G4BetheBlochModel::SampleSecondary(
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const G4MaterialCutsCouple*,
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const G4DynamicParticle* dp,
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G4double minEnergy,
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G4double maxEnergy)
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{
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G4double tmax = MaxSecondaryEnergy(dp);
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G4double maxKinEnergy = min(maxEnergy,tmax);
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G4double minKinEnergy = min(minEnergy,maxKinEnergy);
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G4double kineticEnergy = dp->GetKineticEnergy();
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G4double totEnergy = kineticEnergy + mass;
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G4double etot2 = totEnergy*totEnergy;
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G4double beta2 = kineticEnergy*(kineticEnergy + 2.0*mass)/etot2;
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G4double deltaKinEnergy, f;
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// sampling follows ...
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do {
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G4double q = G4UniformRand();
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deltaKinEnergy = minKinEnergy*maxKinEnergy/(minKinEnergy*(1.0 - q) + maxKinEnergy*q);
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f = 1.0 - beta2*deltaKinEnergy/tmax;
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if( 0.5 == spin ) f += 0.5*deltaKinEnergy*deltaKinEnergy/etot2;
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if(f > 1.0) {
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G4cout << "G4BetheBlochModel::SampleSecondary Warning! "
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<< "Majorant 1.0 < "
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<< f << " for Edelta= " << deltaKinEnergy
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<< G4endl;
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}
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} while( G4UniformRand() > f );
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G4double totMomentum = totEnergy*sqrt(beta2);
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G4double deltaMomentum =
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sqrt(deltaKinEnergy * (deltaKinEnergy + 2.0*electron_mass_c2));
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G4double cost = deltaKinEnergy * (totEnergy + electron_mass_c2) /
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(deltaMomentum * totMomentum);
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G4double sint = sqrt(1.0 - cost*cost);
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G4double phi = twopi * G4UniformRand() ;
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G4ThreeVector deltaDirection(sint*cos(phi),sint*sin(phi), cost) ;
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G4ThreeVector direction = dp->GetMomentumDirection();
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deltaDirection.rotateUz(direction);
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// create G4DynamicParticle object for delta ray
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G4DynamicParticle* delta = new G4DynamicParticle(G4Electron::Electron(),
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deltaDirection,deltaKinEnergy);
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return delta;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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vector<G4DynamicParticle*>* G4BetheBlochModel::SampleSecondaries(
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const G4MaterialCutsCouple* couple,
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const G4DynamicParticle* dp,
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G4double tmin,
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G4double maxEnergy)
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{
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vector<G4DynamicParticle*>* vdp = new vector<G4DynamicParticle*>;
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G4DynamicParticle* delta = SampleSecondary(couple, dp, tmin, maxEnergy);
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vdp->push_back(delta);
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return vdp;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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