Import Geant4 9.4.0 source tree
This commit is contained in:
Gabriele Cosmo
@@ -24,8 +24,8 @@
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// ********************************************************************
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//
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//
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// $Id: G4OpRayleigh.cc,v 1.17 2008/10/24 19:51:12 gum Exp $
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// GEANT4 tag $Name: geant4-09-02 $
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// $Id: G4OpRayleigh.cc,v 1.19 2010/10/29 23:18:35 gum Exp $
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// GEANT4 tag $Name: geant4-09-04 $
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//
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//
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////////////////////////////////////////////////////////////////////////
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@@ -38,7 +38,9 @@
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// Version: 1.0
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// Created: 1996-05-31
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// Author: Juliet Armstrong
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// Updated: 2005-07-28 - add G4ProcessType to constructor
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// Updated: 2010-06-11 - Fix Bug 207; Thanks to Xin Qian
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// (Kellogg Radiation Lab of Caltech)
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// 2005-07-28 - add G4ProcessType to constructor
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// 2001-10-18 by Peter Gumplinger
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// eliminate unused variable warning on Linux (gcc-2.95.2)
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// 2001-09-18 by mma
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@@ -115,7 +117,7 @@ G4OpRayleigh::~G4OpRayleigh()
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// PostStepDoIt
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// -------------
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//
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G4VParticleChange*
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G4VParticleChange*
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G4OpRayleigh::PostStepDoIt(const G4Track& aTrack, const G4Step& aStep)
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{
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aParticleChange.Initialize(aTrack);
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@@ -123,68 +125,82 @@ G4OpRayleigh::PostStepDoIt(const G4Track& aTrack, const G4Step& aStep)
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const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle();
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if (verboseLevel>0) {
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G4cout << "Scattering Photon!" << G4endl;
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G4cout << "Old Momentum Direction: "
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<< aParticle->GetMomentumDirection() << G4endl;
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G4cout << "Old Polarization: "
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<< aParticle->GetPolarization() << G4endl;
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}
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G4cout << "Scattering Photon!" << G4endl;
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G4cout << "Old Momentum Direction: "
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<< aParticle->GetMomentumDirection() << G4endl;
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G4cout << "Old Polarization: "
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<< aParticle->GetPolarization() << G4endl;
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}
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// find polar angle w.r.t. old polarization vector
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G4double cosTheta;
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G4ThreeVector OldMomentumDirection, NewMomentumDirection;
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G4ThreeVector OldPolarization, NewPolarization;
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G4double rand = G4UniformRand();
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do {
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// Try to simulate the scattered photon momentum direction
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// w.r.t. the initial photon momentum direction
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G4double CosTheta = std::pow(rand, 1./3.);
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G4double SinTheta = std::sqrt(1.-CosTheta*CosTheta);
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G4double CosTheta = G4UniformRand();
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G4double SinTheta = std::sqrt(1.-CosTheta*CosTheta);
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// consider for the angle 90-180 degrees
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if (G4UniformRand() < 0.5) CosTheta = -CosTheta;
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if(G4UniformRand() < 0.5)CosTheta = -CosTheta;
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// simulate the phi angle
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G4double rand = twopi*G4UniformRand();
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G4double SinPhi = std::sin(rand);
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G4double CosPhi = std::cos(rand);
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// find azimuthal angle w.r.t old polarization vector
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// start constructing the new momentum direction
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G4double unit_x = SinTheta * CosPhi;
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G4double unit_y = SinTheta * SinPhi;
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G4double unit_z = CosTheta;
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NewMomentumDirection.set (unit_x,unit_y,unit_z);
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rand = G4UniformRand();
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// Rotate the new momentum direction into global reference system
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OldMomentumDirection = aParticle->GetMomentumDirection();
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OldMomentumDirection = OldMomentumDirection.unit();
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NewMomentumDirection.rotateUz(OldMomentumDirection);
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NewMomentumDirection = NewMomentumDirection.unit();
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G4double Phi = twopi*rand;
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G4double SinPhi = std::sin(Phi);
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G4double CosPhi = std::cos(Phi);
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G4double unit_x = SinTheta * CosPhi;
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G4double unit_y = SinTheta * SinPhi;
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G4double unit_z = CosTheta;
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G4ThreeVector NewPolarization (unit_x,unit_y,unit_z);
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// calculate the new polarization direction
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// The new polarization needs to be in the same plane as the new
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// momentum direction and the old polarization direction
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OldPolarization = aParticle->GetPolarization();
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G4double constant = -1./NewMomentumDirection.dot(OldPolarization);
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// Rotate new polarization direction into global reference system
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NewPolarization = NewMomentumDirection + constant*OldPolarization;
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NewPolarization = NewPolarization.unit();
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G4ThreeVector OldPolarization = aParticle->GetPolarization();
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OldPolarization = OldPolarization.unit();
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// There is a corner case, where the Newmomentum direction
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// is the same as oldpolariztion direction:
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// random generate the azimuthal angle w.r.t. Newmomentum direction
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if (NewPolarization.mag() == 0.) {
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rand = G4UniformRand()*twopi;
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NewPolarization.set(std::cos(rand),std::sin(rand),0.);
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NewPolarization.rotateUz(NewMomentumDirection);
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} else {
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// There are two directions which are perpendicular
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// to the new momentum direction
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if (G4UniformRand() < 0.5) NewPolarization = -NewPolarization;
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}
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// simulate according to the distribution cos^2(theta)
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cosTheta = NewPolarization.dot(OldPolarization);
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} while (std::pow(cosTheta,2) < G4UniformRand());
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NewPolarization.rotateUz(OldPolarization);
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NewPolarization = NewPolarization.unit();
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// -- new momentum direction is normal to the new
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// polarization vector and in the same plane as the
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// old and new polarization vectors --
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G4ThreeVector NewMomentumDirection =
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OldPolarization - NewPolarization * CosTheta;
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if(G4UniformRand() < 0.5)NewMomentumDirection = -NewMomentumDirection;
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NewMomentumDirection = NewMomentumDirection.unit();
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aParticleChange.ProposePolarization(NewPolarization);
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aParticleChange.ProposeMomentumDirection(NewMomentumDirection);
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aParticleChange.ProposePolarization(NewPolarization);
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aParticleChange.ProposeMomentumDirection(NewMomentumDirection);
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if (verboseLevel>0) {
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G4cout << "New Polarization: "
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<< NewPolarization << G4endl;
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G4cout << "Polarization Change: "
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<< *(aParticleChange.GetPolarization()) << G4endl;
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G4cout << "New Momentum Direction: "
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<< NewMomentumDirection << G4endl;
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G4cout << "Momentum Change: "
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<< *(aParticleChange.GetMomentumDirection()) << G4endl;
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}
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G4cout << "New Polarization: "
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<< NewPolarization << G4endl;
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G4cout << "Polarization Change: "
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<< *(aParticleChange.GetPolarization()) << G4endl;
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G4cout << "New Momentum Direction: "
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<< NewMomentumDirection << G4endl;
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G4cout << "Momentum Change: "
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<< *(aParticleChange.GetMomentumDirection()) << G4endl;
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}
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return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep);
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}
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@@ -210,8 +226,7 @@ void G4OpRayleigh::BuildThePhysicsTable()
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for (G4int i=0 ; i < numOfMaterials; i++)
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{
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G4PhysicsOrderedFreeVector* ScatteringLengths =
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new G4PhysicsOrderedFreeVector();
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G4PhysicsOrderedFreeVector* ScatteringLengths = NULL;
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G4MaterialPropertiesTable *aMaterialPropertiesTable =
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(*theMaterialTable)[i]->GetMaterialPropertiesTable();
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@@ -230,7 +245,7 @@ void G4OpRayleigh::BuildThePhysicsTable()
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DefaultWater = true;
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ScatteringLengths =
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ScatteringLengths =
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RayleighAttenuationLengthGenerator(aMaterialPropertiesTable);
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}
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}
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