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This commit is contained in:
Gabriele Cosmo
2016-06-09 10:15:15 +02:00
parent 37fff30d2e
commit fbd4999cf7
4396 changed files with 56662 additions and 52446 deletions
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source/processes/electromagnetic/muons/src/G4MuBetheBlochModel.cc
+73 -49
View File
@@ -29,10 +29,17 @@
// File name: G4MuBetheBlochModel
//
// Author: Vladimir Ivanchenko on base of Laszlo Urban code
//
//
// Creation date: 09.08.2002
//
// Modifications: 04.12.2002 VI Fix problem of G4DynamicParticle constructor
// Modifications:
//
// 04-12-02 Fix problem of G4DynamicParticle constructor (V.Ivanchenko)
// 23-12-02 Change interface in order to move to cut per region (V.Ivanchenko)
// 27-01-03 Make models region aware (V.Ivanchenko)
// 13-02-03 Add name (V.Ivanchenko)
//
//
// -------------------------------------------------------------------
//
@@ -47,13 +54,14 @@
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
G4MuBetheBlochModel::G4MuBetheBlochModel(const G4ParticleDefinition* p)
: G4VEmModel(),
G4MuBetheBlochModel::G4MuBetheBlochModel(const G4ParticleDefinition* p,
const G4String& nam)
: G4VEmModel(nam),
particle(0),
highKinEnergy(100.*TeV),
lowKinEnergy(2.0*MeV),
twoln10(2.0*log(10.0)),
bg2lim(0.0169),
bg2lim(0.0169),
taulim(8.4146e-3)
{
if(p) SetParticle(p);
@@ -61,12 +69,12 @@ G4MuBetheBlochModel::G4MuBetheBlochModel(const G4ParticleDefinition* p)
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
G4MuBetheBlochModel::~G4MuBetheBlochModel()
G4MuBetheBlochModel::~G4MuBetheBlochModel()
{}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
void G4MuBetheBlochModel::SetParticle(const G4ParticleDefinition* p)
void G4MuBetheBlochModel::SetParticle(const G4ParticleDefinition* p)
{
particle = p;
mass = particle->GetPDGMass();
@@ -79,17 +87,15 @@ void G4MuBetheBlochModel::SetParticle(const G4ParticleDefinition* p)
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
G4double G4MuBetheBlochModel::HighEnergyLimit(const G4ParticleDefinition* p,
const G4Material*)
G4double G4MuBetheBlochModel::HighEnergyLimit(const G4ParticleDefinition* p)
{
if(!particle) SetParticle(p);
return highKinEnergy;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
G4double G4MuBetheBlochModel::LowEnergyLimit(const G4ParticleDefinition* p,
const G4Material*)
G4double G4MuBetheBlochModel::LowEnergyLimit(const G4ParticleDefinition* p)
{
if(!particle) SetParticle(p);
return lowKinEnergy;
@@ -98,33 +104,40 @@ G4double G4MuBetheBlochModel::LowEnergyLimit(const G4ParticleDefinition* p,
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
G4double G4MuBetheBlochModel::MinEnergyCut(const G4ParticleDefinition* p,
const G4Material* material)
const G4MaterialCutsCouple* couple)
{
return material->GetIonisation()->GetMeanExcitationEnergy();
return couple->GetMaterial()->GetIonisation()->GetMeanExcitationEnergy();
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
G4bool G4MuBetheBlochModel::IsInCharge(const G4ParticleDefinition* p,
const G4Material*)
G4bool G4MuBetheBlochModel::IsInCharge(const G4ParticleDefinition* p)
{
return (p->GetPDGCharge() != 0.0 && p->GetPDGMass() > 10.*MeV
if(!particle) SetParticle(p);
return (p->GetPDGCharge() != 0.0 && p->GetPDGMass() > 10.*MeV
&& p->GetPDGSpin() == 0.5);
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
void G4MuBetheBlochModel::Initialise(const G4ParticleDefinition* p,
const G4DataVector&)
{
if(!particle) SetParticle(p);
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
G4double G4MuBetheBlochModel::ComputeDEDX(const G4Material* material,
const G4ParticleDefinition* p,
G4double kineticEnergy,
G4double cutEnergy)
G4double cutEnergy)
{
if(!particle) SetParticle(p);
G4double tmax = MaxSecondaryEnergy(p, kineticEnergy);
G4double tau = kineticEnergy/mass;
G4double x = 1.0;
if(cutEnergy < tmax) x = cutEnergy/tmax;
G4double gam = tau + 1.0;
G4double gam = tau + 1.0;
G4double beta2 = 1. - 1./(gam*gam);
G4double bg2 = tau * (tau+2.0);
@@ -139,14 +152,14 @@ G4double G4MuBetheBlochModel::ComputeDEDX(const G4Material* material,
G4double* shellCorrectionVector =
material->GetIonisation()->GetShellCorrectionVector();
G4double eDensity = material->GetElectronDensity();
G4double dedx = log(2.0*electron_mass_c2*bg2*tmax*x/eexc2)-(1.0 + x)*beta2;
G4double totEnergy = kineticEnergy + mass;
G4double del = 0.5*x*tmax/totEnergy;
dedx += del*del;
// density correction
// density correction
x = log(bg2)/twoln10;
if ( x >= x0den ) {
dedx -= twoln10*x - cden ;
@@ -194,20 +207,19 @@ G4double G4MuBetheBlochModel::CrossSection(const G4Material* material,
G4double cutEnergy,
G4double maxEnergy)
{
if(!particle) SetParticle(p);
G4double cross = 0.0;
G4double tmaxSecondary = MaxSecondaryEnergy(p, kineticEnergy);
G4double tmax = G4std::min(tmaxSecondary, maxEnergy);
if(cutEnergy < tmax) {
const G4ElementVector* theElementVector = material->GetElementVector();
const G4double* NbOfAtomsPerVolume = material->GetVecNbOfAtomsPerVolume();
G4int NumberOfElements = material->GetNumberOfElements();
for (G4int iel=0; iel<NumberOfElements; iel++ ) {
cross += NbOfAtomsPerVolume[iel]* CrossSectionPerAtom(
(*theElementVector)[iel]->GetZ(),
cross += NbOfAtomsPerVolume[iel]* CrossSectionPerAtom(
(*theElementVector)[iel]->GetZ(),
kineticEnergy, cutEnergy, tmax, tmaxSecondary);
}
@@ -227,7 +239,7 @@ G4double G4MuBetheBlochModel::CrossSectionPerAtom(
G4double tmax,
G4double tmaxSecondary)
{
G4double cross = 0.;
const G4double xgi[] = {0.06943,0.33001,0.66999,0.93057};
@@ -279,18 +291,18 @@ G4double G4MuBetheBlochModel::DifCrossSectionPerAtom(G4double kineticEnergy,
(beta2*knockonEnergy*knockonEnergy);
G4double a1 = log(1.+2.*knockonEnergy/electron_mass_c2);
G4double a3 = log(4.*totalEnergy*(totalEnergy-knockonEnergy)/(mass*mass));
cross *= (1.+alphaprime*a1*(a3-a1));
cross *= (1.+alphaprime*a1*(a3-a1));
return cross;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
G4std::vector<G4DynamicParticle*>* G4MuBetheBlochModel::SampleSecondary(
const G4Material* material,
G4DynamicParticle* G4MuBetheBlochModel::SampleSecondary(
const G4MaterialCutsCouple*,
const G4DynamicParticle* dp,
G4double tmin,
G4double maxEnergy)
G4double maxEnergy)
{
G4double tmax = MaxSecondaryEnergy(dp);
G4double xmin = tmin/tmax;
@@ -304,21 +316,21 @@ G4std::vector<G4DynamicParticle*>* G4MuBetheBlochModel::SampleSecondary(
G4double beta2 = 1. - mass*mass/(totEnergy*totEnergy);
G4double x = 0.5*tmax*tmax/(totEnergy*totEnergy);
const G4double alphaprime = fine_structure_const/twopi;
G4double a0=log(2.*totEnergy/mass);
const G4double alphaprime = fine_structure_const/twopi;
G4double a0=log(2.*totEnergy/mass);
G4double grej = (1.0 - beta2*xmin + xmax*xmax*x)*(1. + alphaprime*a0*a0);
G4double z, f, a1, twoep;
// sampling follows ...
// sampling follows ...
do {
G4double q = G4UniformRand();
z = xmin*xmax/(xmin*(1.0 - q) + xmax*q);
twoep = 2.0*z*tmax;
a1= log(1.0 + twoep/electron_mass_c2);
a1= log(1.0 + twoep/electron_mass_c2);
f = (1.0 - beta2 * z + z*z*x)
* (1. + alphaprime*a1*(a0 + log((2.0*totEnergy-twoep)/mass) - a1));
@@ -326,23 +338,23 @@ G4std::vector<G4DynamicParticle*>* G4MuBetheBlochModel::SampleSecondary(
G4cout << "G4MuBetheBlochModel::SampleSecondary Warning! "
<< "Majorant " << grej << " < "
<< f << " for x= " << z
<< G4endl;
<< G4endl;
}
} while( grej*G4UniformRand() >= f );
G4double deltaKinEnergy = z * tmax;
G4double deltaMomentum =
G4double deltaMomentum =
sqrt(deltaKinEnergy * (deltaKinEnergy + 2.0*electron_mass_c2));
G4double totMomentum = sqrt(totEnergy*totEnergy - mass*mass);
G4double cost = deltaKinEnergy * (totEnergy + electron_mass_c2) /
(deltaMomentum * totMomentum);
G4double sint = sqrt(1.0 - cost*cost);
G4double phi = twopi * G4UniformRand() ;
G4double phi = twopi * G4UniformRand() ;
G4ThreeVector deltaDirection(sint*cos(phi),sint*sin(phi), cost) ;
deltaDirection.rotateUz(momentum);
@@ -353,7 +365,19 @@ G4std::vector<G4DynamicParticle*>* G4MuBetheBlochModel::SampleSecondary(
delta->SetKineticEnergy(deltaKinEnergy);
delta->SetMomentumDirection(deltaDirection);
return delta;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
G4std::vector<G4DynamicParticle*>* G4MuBetheBlochModel::SampleSecondaries(
const G4MaterialCutsCouple* couple,
const G4DynamicParticle* dp,
G4double tmin,
G4double maxEnergy)
{
G4std::vector<G4DynamicParticle*>* vdp = new G4std::vector<G4DynamicParticle*>;
G4DynamicParticle* delta = SampleSecondary(couple,dp,tmin,maxEnergy);
vdp->push_back(delta);
return vdp;