Import Geant4 10.6.0 source tree

source/processes/biasing/generic/include/G4BOptnChangeCrossSection.hh

@@ -74,7 +74,7 @@ public:
   // -- return concrete type of interaction law:
   G4InteractionLawPhysical* GetBiasedExponentialLaw() {return fBiasedExponentialLaw;}
   // -- set biased cross-section:
-  void     SetBiasedCrossSection(G4double xst);
+  void     SetBiasedCrossSection(G4double xst, bool updateInteractionLength = false);
   G4double GetBiasedCrossSection() const;
   // -- Sample underneath distribution:
   void Sample();

source/processes/biasing/generic/include/G4BOptnLeadingParticle.hh

@@ -0,0 +1,96 @@
+//
+// ********************************************************************
+// * 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.          *
+// ********************************************************************
+//
+//
+//
+//---------------------------------------------------------------------
+//
+// G4BOptnLeadingParticle
+//
+// Class Description:
+//       A G4VBiasingOperation that implements the so-called "Leading
+//   particle biasing scheme". It is of interest in the shield problem
+//   to estimate the flux leaking from the shield.
+//       It works as follows:
+//       - it is intented for hadronic inelastic interaction
+//       - at each interaction, are kept:
+//           - the most energetic particle (the leading particle)
+//               - with unmodified weight
+//           - randomly one particle of each species
+//               - with this particle weight = n * primary_weight where
+//                 n is the number of particles of this species
+//---------------------------------------------------------------------
+// Initial version                                 Nov. 2019 M. Verderi
+
+
+#ifndef G4BOptnLeadingParticle_hh
+#define G4BOptnLeadingParticle_hh 1
+
+#include "G4VBiasingOperation.hh"
+#include "G4ParticleChange.hh"
+
+class G4BOptnLeadingParticle : public G4VBiasingOperation {
+public:
+  // -- Constructor :
+  G4BOptnLeadingParticle(G4String name);
+  // -- destructor:
+  virtual ~G4BOptnLeadingParticle();
+  
+public:
+  // -- Methods from G4VBiasingOperation interface:
+  // ----------------------------------------------
+  // -- Unused:
+  virtual const G4VBiasingInteractionLaw* ProvideOccurenceBiasingInteractionLaw( const G4BiasingProcessInterface*, G4ForceCondition& ) {return nullptr;}
+  // -- Used:
+  virtual G4VParticleChange*                             ApplyFinalStateBiasing( const G4BiasingProcessInterface*, // -- Method used for this biasing. The related biasing operator
+										 const G4Track*,                   // -- returns this biasing operation at the post step do it level
+										 const G4Step*,                    // -- when the wrapped process has won the interaction length race.
+										 G4bool& );                        // -- The wrapped process final state is then trimmed.
+  // -- Unused:
+  virtual G4double                                     DistanceToApplyOperation( const G4Track*,
+										 G4double,
+										 G4ForceCondition*)                                    {return 0;}
+  virtual G4VParticleChange*                         GenerateBiasingFinalState( const G4Track*,
+										const G4Step*  )                                       {return nullptr;}
+
+public:
+  // -- The possibility is given to further apply a Russian roulette on tracks that are accompagnying the leading particle
+  // -- after the classical leading particle biasing algorithm has been applied.
+  // -- This is of interest when applying the technique to e+ -> gamma gamma for example. Given one gamma is leading,
+  // -- the second one is alone in its category, hence selected. With the Russian roulette it is then possible to keep
+  // -- this one randomly. This is also of interest for pi0 decays, or for brem. e- -> e- gamma where the e- or gamma
+  // -- are alone in their category.
+  void     SetFurtherKillingProbability( G4double p )       { fRussianRouletteKillingProbability = p;    }   // -- if p <= 0.0 the killing is ignored.
+  G4double GetFurtherKillingProbability()             const { return fRussianRouletteKillingProbability; }
+  
+private:
+  // -- Particle change used to return the trimmed final state:
+  G4ParticleChange fParticleChange;
+  G4double         fRussianRouletteKillingProbability;
+
+  
+};
+
+#endif