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This commit is contained in:
Gabriele Cosmo
2016-06-09 14:36:02 +02:00
parent d93e1e39a9
commit 8a51e0bc40
5471 changed files with 99628 additions and 55248 deletions
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source/processes/electromagnetic/muons/src/G4MuPairProductionModel.cc
+58 -30
View File
@@ -20,8 +20,8 @@
// * statement, and all its terms. *
// ********************************************************************
//
// $Id: G4MuPairProductionModel.cc,v 1.25 2005/04/12 18:12:33 vnivanch Exp $
// GEANT4 tag $Name: geant4-07-01 $
// $Id: G4MuPairProductionModel.cc,v 1.28 2005/10/23 16:47:23 vnivanch Exp $
// GEANT4 tag $Name: geant4-08-00 $
//
// -------------------------------------------------------------------
//
@@ -50,6 +50,8 @@
// material (V.Ivanchenko)
// 01-11-04 Fix bug in expression inside ComputeDMicroscopicCrossSection (R.Kokoulin)
// 08-04-05 Major optimisation of internal interfaces (V.Ivantchenko)
// 03-08-05 Add SetParticle method (V.Ivantchenko)
// 23-10-05 Add protection in sampling of e+e- pair energy needed for low cuts (V.Ivantchenko)
//
// Class Description:
@@ -86,7 +88,7 @@ G4double G4MuPairProductionModel::wgi[]={ 0.0506,0.1112,0.1569,0.1813,0.1813,0.1
using namespace std;
G4MuPairProductionModel::G4MuPairProductionModel(const G4ParticleDefinition*,
G4MuPairProductionModel::G4MuPairProductionModel(const G4ParticleDefinition* p,
const G4String& nam)
: G4VEmModel(nam),
minPairEnergy(4.*electron_mass_c2),
@@ -94,9 +96,8 @@ G4MuPairProductionModel::G4MuPairProductionModel(const G4ParticleDefinition*,
factorForCross(4.*fine_structure_const*fine_structure_const
*classic_electr_radius*classic_electr_radius/(3.*pi)),
sqrte(sqrt(exp(1.))),
particleMass(G4MuonPlus::MuonPlus()->GetPDGMass()),
currentZ(0),
particle(G4MuonPlus::MuonPlus()),
particle(0),
nzdat(5),
ntdat(8),
nbiny(1000),
@@ -107,6 +108,11 @@ G4MuPairProductionModel::G4MuPairProductionModel(const G4ParticleDefinition*,
samplingTablesAreFilled(false)
{
SetLowEnergyLimit(minPairEnergy);
theElectron = G4Electron::Electron();
thePositron = G4Positron::Positron();
if(p) SetParticle(p);
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
@@ -122,16 +128,24 @@ G4double G4MuPairProductionModel::MinEnergyCut(const G4ParticleDefinition*,
return minPairEnergy;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
void G4MuPairProductionModel::SetParticle(const G4ParticleDefinition* p)
{
if(!particle) {
particle = p;
particleMass = particle->GetPDGMass();
}
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
void G4MuPairProductionModel::Initialise(const G4ParticleDefinition*,
void G4MuPairProductionModel::Initialise(const G4ParticleDefinition* p,
const G4DataVector&)
{
if(p) SetParticle(p);
if (!samplingTablesAreFilled) MakeSamplingTables();
theElectron = G4Electron::Electron();
thePositron = G4Positron::Positron();
if(pParticleChange)
fParticleChange = reinterpret_cast<G4ParticleChangeForLoss*>(pParticleChange);
else
@@ -435,7 +449,7 @@ void G4MuPairProductionModel::MakeSamplingTables()
vector<G4DynamicParticle*>* G4MuPairProductionModel::SampleSecondaries(
const G4MaterialCutsCouple* couple,
const G4DynamicParticle* aDynamicParticle,
G4double cut,
G4double tmin,
G4double tmax)
{
G4double kineticEnergy = aDynamicParticle->GetKineticEnergy();
@@ -448,23 +462,28 @@ vector<G4DynamicParticle*>* G4MuPairProductionModel::SampleSecondaries(
G4double dt = log(kineticEnergy/tdat[it-1])/log(tdat[it]/tdat[it-1]);
// select randomly one element constituing the material
G4int iymin = 0;
G4int iymax = nbiny-1;
const G4Element* anElement = SelectRandomAtom(kineticEnergy, dt, it, couple);
SetCurrentElement(anElement->GetZ());
G4double maxPairEnergy = MaxSecondaryEnergy(particle,kineticEnergy);
G4double maxEnergy = min(tmax, maxPairEnergy);
G4double minEnergy = min(maxEnergy, cut);
G4double maxEnergy = std::min(tmax, maxPairEnergy);
G4double minEnergy = std::max(tmin, minPairEnergy);
if(minEnergy >= maxEnergy) return 0;
//G4cout << "emin= " << minEnergy << " emax= " << maxEnergy
// << " minPair= " << minPairEnergy << " maxpair= " << maxPairEnergy
// << " ymin= " << ymin << " dy= " << dy << G4endl;
G4int iymin = 0;
G4int iymax = nbiny-1;
if( minEnergy > minPairEnergy)
{
G4double xc = log(minEnergy/minPairEnergy)/log(maxPairEnergy/minPairEnergy);
iymin = (G4int)((log(xc) - ymin)/dy);
if(iymin >= nbiny) iymin = nbiny-1;
else if(iymin < 0) iymin = 0;
xc = log(maxEnergy/minPairEnergy)/log(maxPairEnergy/minPairEnergy);
iymax = (G4int)((log(xc) - ymin)/dy) + 1;
if(iymax >= nbiny) iymax = nbiny-1;
else if(iymax < 0) iymax = 0;
}
// sample e-e+ energy, pair energy first
@@ -488,6 +507,7 @@ vector<G4DynamicParticle*>* G4MuPairProductionModel::SampleSecondaries(
p2 = InterpolatedIntegralCrossSection(dt, dz, iz, it, iy, currentZ);
if(p <= p2) break;
}
// G4cout << "iy= " << iy << " iymin= " << iymin << " iymax= " << iymax << " Z= " << currentZ << G4endl;
G4double y = ya[iy-1] + dy*(p - p1)/(p2 - p1);
G4double PairEnergy = minPairEnergy*exp(exp(y)*log(maxPairEnergy/minPairEnergy));
@@ -495,7 +515,7 @@ vector<G4DynamicParticle*>* G4MuPairProductionModel::SampleSecondaries(
if(PairEnergy > maxEnergy) PairEnergy = maxEnergy;
// sample r=(E+-E-)/PairEnergy ( uniformly .....)
G4double rmax =
G4double rmax =
(1.-6.*particleMass*particleMass/(totalEnergy*(totalEnergy-PairEnergy)))
*sqrt(1.-minPairEnergy/PairEnergy);
G4double r = rmax * (-1.+2.*G4UniformRand()) ;
@@ -506,36 +526,44 @@ vector<G4DynamicParticle*>* G4MuPairProductionModel::SampleSecondaries(
// angles of the emitted particles ( Z - axis along the parent particle)
// (mean theta for the moment)
G4double Teta = electron_mass_c2/totalEnergy ;
G4double Phi = twopi * G4UniformRand() ;
G4double dirx = sin(Teta)*cos(Phi);
G4double diry = sin(Teta)*sin(Phi);
G4double dirz = cos(Teta) ;
//
// scattered electron (positron) angles. ( Z - axis along the parent photon)
//
// universal distribution suggested by L. Urban
// (Geant3 manual (1993) Phys211),
// derived from Tsai distribution (Rev Mod Phys 49,421(1977))
// G4cout << "Ee= " << ElectronEnergy << " Ep= " << PositronEnergy << G4endl;
G4double u;
const G4double a1 = 0.625 , a2 = 3.*a1 , d = 27. ;
//G4double finalPx,finalPy,finalPz ;
G4double ElectKineEnergy = ElectronEnergy - electron_mass_c2 ;
if (9./(9.+d) >G4UniformRand()) u= - log(G4UniformRand()*G4UniformRand())/a1;
else u= - log(G4UniformRand()*G4UniformRand())/a2;
G4ThreeVector ElectDirection ( dirx, diry, dirz );
G4double TetEl = u*electron_mass_c2/ElectronEnergy;
G4double TetPo = u*electron_mass_c2/PositronEnergy;
G4double Phi = twopi * G4UniformRand();
G4double dxEl= sin(TetEl)*cos(Phi),dyEl= sin(TetEl)*sin(Phi),dzEl=cos(TetEl);
G4double dxPo=-sin(TetPo)*cos(Phi),dyPo=-sin(TetPo)*sin(Phi),dzPo=cos(TetPo);
G4ThreeVector ElectDirection (dxEl, dyEl, dzEl);
ElectDirection.rotateUz(ParticleDirection);
// create G4DynamicParticle object for the particle1
G4DynamicParticle* aParticle1= new G4DynamicParticle(theElectron,
ElectDirection,
ElectKineEnergy);
ElectronEnergy - electron_mass_c2);
G4double PositKineEnergy = PositronEnergy - electron_mass_c2 ;
G4ThreeVector PositDirection ( -dirx, -diry, dirz );
G4ThreeVector PositDirection (dxPo, dyPo, dzPo);
PositDirection.rotateUz(ParticleDirection);
// create G4DynamicParticle object for the particle2
G4DynamicParticle* aParticle2= new G4DynamicParticle(thePositron,
PositDirection,
PositKineEnergy);
PositronEnergy - electron_mass_c2);
// primary change
kineticEnergy -= (ElectKineEnergy + PositKineEnergy + 2.0*electron_mass_c2);
kineticEnergy -= (ElectronEnergy + PositronEnergy);
fParticleChange->SetProposedKineticEnergy(kineticEnergy);
vector<G4DynamicParticle*>* vdp = new vector<G4DynamicParticle*>;