Import Geant4 11.3.0 source tree

2024-12-06 11:11:40 +01:00
parent e58e650b32
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+//
+// ********************************************************************
+// * License and Disclaimer                                           *
+// *                                                                  *
+// * The  Geant4 software  is  copyright of the Copyright Holders  of *
+// * the Geant4 Collaboration.  It is provided  under  the terms  and *
+// * conditions of the Geant4 Software License,  included in the file *
+// * LICENSE and available at  http://cern.ch/geant4/license .  These *
+// * include a list of copyright holders.                             *
+// *                                                                  *
+// * Neither the authors of this software system, nor their employing *
+// * institutes,nor the agencies providing financial support for this *
+// * work  make  any representation or  warranty, express or implied, *
+// * regarding  this  software system or assume any liability for its *
+// * use.  Please see the license in the file  LICENSE  and URL above *
+// * for the full disclaimer and the limitation of liability.         *
+// *                                                                  *
+// * This  code  implementation is the result of  the  scientific and *
+// * technical work of the GEANT4 collaboration.                      *
+// * By using,  copying,  modifying or  distributing the software (or *
+// * any work based  on the software)  you  agree  to acknowledge its *
+// * use  in  resulting  scientific  publications,  and indicate your *
+// * acceptance of all terms of the Geant4 Software license.          *
+// ********************************************************************
+//
+//
+// -------------------------------------------------------------------
+//
+// GEANT4 Class file
+//
+//
+// File name:     G4DynamicParticleMSC
+//
+// Author:        Vladimir Ivanchenko
+//
+// Creation date: 17.08.2024
+//
+// -------------------------------------------------------------------
+//
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+#include "G4DynamicParticleMSC.hh"
+#include "G4PhysicalConstants.hh"
+#include "G4SystemOfUnits.hh"
+#include "G4EmProcessSubType.hh"
+#include "G4LossTableManager.hh"
+#include "G4Step.hh"
+#include "G4Track.hh"
+#include "G4Log.hh"
+#include "G4Exp.hh"
+
+namespace
+{
+  constexpr G4double c_highland = 13.6*CLHEP::MeV;
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+G4DynamicParticleMSC::G4DynamicParticleMSC()
+  : G4VContinuousDiscreteProcess("dynPartMSC")
+{
+  SetVerboseLevel(1);
+  SetProcessSubType(fDynamicMultipleScattering);
+  lManager = G4LossTableManager::Instance();  
+  lManager->Register(this);
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+G4DynamicParticleMSC::~G4DynamicParticleMSC()
+{
+  lManager->DeRegister(this);
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+void G4DynamicParticleMSC::PreStepInitialisation(const G4Track& track)
+{
+  fMaterial = track.GetMaterial();
+  fZeff = fMaterial->GetIonisation()->GetZeffective();
+  auto dpart = track.GetDynamicParticle();
+  fEkinPreStep = dpart->GetKineticEnergy();
+  fBeta = dpart->GetBeta();
+  fCharge = dpart->GetCharge()/CLHEP::eplus;
+  fMass = std::max(dpart->GetMass(), CLHEP::electron_mass_c2);
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+G4double G4DynamicParticleMSC::AlongStepGetPhysicalInteractionLength(
+                                  const G4Track& track, G4double, G4double, G4double&,
+                                  G4GPILSelection* selection)
+{
+  *selection = CandidateForSelection;
+  PreStepInitialisation(track);
+
+  // no step limit for the time being
+  return DBL_MAX;
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+G4double G4DynamicParticleMSC::PostStepGetPhysicalInteractionLength(
+                                  const G4Track&, G4double,
+                                  G4ForceCondition* condition)
+{
+  *condition = NotForced;
+  return DBL_MAX;
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+G4VParticleChange* G4DynamicParticleMSC::AlongStepDoIt(const G4Track& track,
+						              const G4Step& step)
+{
+  fParticleChange.InitialiseMSC(track, step);
+
+  // no energy loss
+  if (fCharge == 0.0) { return &fParticleChange; }
+
+  G4double geomLength = step.GetStepLength();
+  G4double y = geomLength/fMaterial->GetRadlen();
+  G4double theta0 = c_highland*std::abs(fCharge)*std::sqrt(y)*
+    (1.0 + 0.038*G4Log(y*fCharge*fCharge/(fBeta*fBeta)))/fBeta;
+
+  if (theta0 < 0.001) { return &fParticleChange; }
+  G4double cost = 1.0;
+  G4double r = G4UniformRand();
+  if (theta0 < 1.0) {
+    G4double theta2 = theta0*theta0;
+    cost -= theta2*G4Log(1.0 + r*(G4Exp(2.0/theta2) - 1.0));
+  } else {
+    cost -= 2.0*r;
+  }
+  G4double phi = CLHEP::twopi*G4UniformRand();
+  G4double sint = std::sqrt((1.0 - cost)*(1.0 + cost));
+  fNewDir.set(sint*std::cos(phi), sint*std::sin(phi), cost);
+  fNewDir.rotateUz(step.GetPostStepPoint()->GetMomentumDirection());
+  
+  fParticleChange.ProposeMomentumDirection(fNewDir);
+  fParticleChange.ProposeTrueStepLength(geomLength);
+  return &fParticleChange;
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+G4double G4DynamicParticleMSC::GetMeanFreePath(const G4Track&, G4double,
+					       G4ForceCondition* condition)
+{
+  *condition = Forced;
+  return DBL_MAX;
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+G4double G4DynamicParticleMSC::GetContinuousStepLimit(const G4Track& track,
+						      G4double previousStepSize,
+                                                      G4double currentMinimalStep,
+						      G4double& currentSafety)
+{
+  G4GPILSelection selection = NotCandidateForSelection;
+  G4double x = AlongStepGetPhysicalInteractionLength(track, previousStepSize,
+						     currentMinimalStep,
+					             currentSafety, &selection);
+  return x;
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+void G4DynamicParticleMSC::ProcessDescription(std::ostream& out) const
+{
+  out << "G4DynamicParticleMSC: no delta rays" << G4endl;
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....