Kamil Sedlak 2009-05-18

This is the first version of the muSR simulation code (musrSim)
based on the merged codes of Kamil Sedlak and Toni Shiroka.
It should be a running version of the simulation code, however 
it has not been very well tested, therefore it will probably
need some further development.

include/musrMuFormation.hh

@@ -0,0 +1,80 @@
+//  Geant4 simulation for MuSR
+//  AUTHOR: Toni SHIROKA, Paul Scherrer Institut, PSI
+//  DATE  : 2008-05
+//
+
+//$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
+//  Muonium Formation according to yield.cc function (through GetYields method).
+//  Id    : musrMuFormation.hh, v 1.4
+//  Author: Taofiq PARAISO, T. Shiroka
+//  Date  : 2007-12
+//$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
+                              
+#ifndef   musrMuFormation_h
+#define   musrMuFormation_h 1
+
+#include "G4VDiscreteProcess.hh"
+#include "G4ParticleTable.hh"
+
+#include "yields.hh"
+
+/*! musrMuFormation class defines the muonium formation process in the Carbon foil 
+ *  according to yields from Gonin's paper Sci. Rev. Instrum. 65(3), 648-652 (1994).
+ * \image html yields3.gif The muonium formation yields.
+ * The main parameters are the foil thickness and muon energy. For a given energy, 
+ * a corresponding proportion of the muons will be converted into Muonium.
+ * Concretely, the muon is eliminated and replaced by a Muonium with identical 
+ * properties, including time, energy, momentum, position etc.
+ *
+ * The process is executed at the END of a step, i.e. the muon is converted into 
+ * Muonium AFTER flying through the Carbon foil (see also yields.hh). */
+
+class musrMuFormation : public G4VDiscreteProcess
+{
+ public:
+   
+   musrMuFormation(const G4String& name = "MuFormation", // process description
+		   G4ProcessType aType = fElectromagnetic);
+
+  ~musrMuFormation();
+  
+  //! - Main method. Muonium formation process is executed at the END of a step. */
+  G4VParticleChange* PostStepDoIt(
+			     const G4Track&,
+			     const G4Step&);
+  
+  G4double GetMeanFreePath(const G4Track& aTrack,
+			   G4double previousStepSize,
+			   G4ForceCondition* condition);
+
+
+  //! Condition for process application (step Object).
+  G4bool CheckCondition(const G4Step& aStep);
+  
+  //! Condition for process application (step Pointer).
+  G4bool CheckCondition(const G4Step* aStep);
+  
+  
+  G4String  p_name;
+  G4bool condition;
+  
+  
+  void GetDatas( const G4Step* aStep);
+  // model parameters
+  G4ParticleTable* particleTable; 
+  G4ParticleDefinition* particle;
+  Yields   Gonin;
+  G4double yvector[3];
+  G4double rnd;
+  G4DynamicParticle *DP;
+  
+  //! The particle change object.
+  G4VParticleChange fParticleChange; 
+ 
+  void  PrepareSecondary(const G4Track&);
+  G4Track* aSecondary;
+
+  void InitializeSecondaries(const G4Track&);
+};
+
+#endif