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This commit is contained in:
Gabriele Cosmo
2016-06-10 14:11:04 +02:00
parent c9b32a6c0a
commit d4af681f38
4886 changed files with 420149 additions and 1023309 deletions
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source/processes/optical/src/G4OpRayleigh.cc
+15 -11
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@@ -24,7 +24,7 @@
// ********************************************************************
//
//
// $Id: G4OpRayleigh.cc 84717 2014-10-20 07:39:47Z gcosmo $
// $Id: G4OpRayleigh.cc 92045 2015-08-14 07:21:23Z gcosmo $
//
//
////////////////////////////////////////////////////////////////////////
@@ -139,24 +139,27 @@ G4OpRayleigh::PostStepDoIt(const G4Track& aTrack, const G4Step& aStep)
G4ThreeVector OldMomentumDirection, NewMomentumDirection;
G4ThreeVector OldPolarization, NewPolarization;
G4double rand, constant;
G4double CosTheta, SinTheta, SinPhi, CosPhi, unit_x, unit_y, unit_z;
do {
// Try to simulate the scattered photon momentum direction
// w.r.t. the initial photon momentum direction
G4double CosTheta = G4UniformRand();
G4double SinTheta = std::sqrt(1.-CosTheta*CosTheta);
CosTheta = G4UniformRand();
SinTheta = std::sqrt(1.-CosTheta*CosTheta);
// consider for the angle 90-180 degrees
if (G4UniformRand() < 0.5) CosTheta = -CosTheta;
// simulate the phi angle
G4double rand = twopi*G4UniformRand();
G4double SinPhi = std::sin(rand);
G4double CosPhi = std::cos(rand);
rand = twopi*G4UniformRand();
SinPhi = std::sin(rand);
CosPhi = std::cos(rand);
// start constructing the new momentum direction
G4double unit_x = SinTheta * CosPhi;
G4double unit_y = SinTheta * SinPhi;
G4double unit_z = CosTheta;
unit_x = SinTheta * CosPhi;
unit_y = SinTheta * SinPhi;
unit_z = CosTheta;
NewMomentumDirection.set (unit_x,unit_y,unit_z);
// Rotate the new momentum direction into global reference system
@@ -169,9 +172,9 @@ G4OpRayleigh::PostStepDoIt(const G4Track& aTrack, const G4Step& aStep)
// The new polarization needs to be in the same plane as the new
// momentum direction and the old polarization direction
OldPolarization = aParticle->GetPolarization();
G4double constant = -1./NewMomentumDirection.dot(OldPolarization);
constant = -NewMomentumDirection.dot(OldPolarization);
NewPolarization = NewMomentumDirection + constant*OldPolarization;
NewPolarization = OldPolarization + constant*NewMomentumDirection;
NewPolarization = NewPolarization.unit();
// There is a corner case, where the Newmomentum direction
@@ -189,6 +192,7 @@ G4OpRayleigh::PostStepDoIt(const G4Track& aTrack, const G4Step& aStep)
// simulate according to the distribution cos^2(theta)
cosTheta = NewPolarization.dot(OldPolarization);
// Loop checking, 13-Aug-2015, Peter Gumplinger
} while (std::pow(cosTheta,2) < G4UniformRand());
aParticleChange.ProposePolarization(NewPolarization);