Added Landau energy loss distribution at carbon foil of LEM apparatus

include/musrDetectorConstruction.hh

@@ -41,6 +41,7 @@ class G4VPhysicalVolume;
 class G4Material;
 class musrDetectorMessenger;
 class musrScintSD;
+class musrMuEnergyLossLandau;
 
 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 

include/musrMuEnergyLossLandau.hh

@@ -0,0 +1,95 @@
+/***************************************************************************
+ *  musrSim - the program for the simulation of (mainly) muSR instruments. *
+ *          More info on http://lmu.web.psi.ch/simulation/index.html .     *
+ *          musrSim is based od Geant4 (http://geant4.web.cern.ch/geant4/) *
+ *                                                                         *
+ *  Copyright (C) 2009 by Paul Scherrer Institut, 5232 Villigen PSI,       *
+ *                                                       Switzerland       *
+ *                                                                         *
+ *  This program is free software; you can redistribute it and/or modify   *
+ *  it under the terms of the GNU General Public License as published by   *
+ *  the Free Software Foundation; either version 2 of the License, or      *
+ *  (at your option) any later version.                                    *
+ *                                                                         *
+ *  This program is distributed in the hope that it will be useful,        *
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of         *
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
+ *  GNU General Public License for more details.                           *
+ *                                                                         *
+ *  You should have received a copy of the GNU General Public License      *
+ *  along with this program; if not, write to the Free Software            *
+ *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.              *
+ ***************************************************************************/
+
+//$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
+//  Muonium Formation according to yield.cc function (through GetYields method).
+//  Id    : musrMuFormation.hh, v 1.4
+//  Author: Taofiq PARAISO, T. Shiroka
+//  Date  : 2007-12
+//$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
+                              
+#ifndef   musrMuEnergyLossLandau_h
+#define   musrMuEnergyLossLandau_h 1
+
+#include "G4VDiscreteProcess.hh"
+#include "G4ParticleTable.hh"
+
+#include <TMath.h>
+#include <TRandom.h>
+
+
+/*! musrMuEnergyLossLandau class defines the energy loss given by the Landau distribution,
+   in, for example, the thin Carbon foil of the LEM beam line 
+  */
+
+class musrMuEnergyLossLandau : public G4VDiscreteProcess
+{
+ public:
+   
+   musrMuEnergyLossLandau(const G4String& name = "MuEnergyLossLandau", // process description
+		   G4ProcessType aType = fElectromagnetic);
+
+  ~musrMuEnergyLossLandau();
+  
+  //! - Main method. muon energy loss 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 GetFinalEnergy( const G4Step* aStep);
+  TRandom *random;
+  static double landauMPV;
+  static double landauSigma;
+
+  // model parameters
+  G4ParticleTable* particleTable; 
+  G4ParticleDefinition* particle;
+  G4double rnd;
+  G4DynamicParticle *DP;
+  
+  //! The particle change object.
+  G4VParticleChange fParticleChange; 
+ 
+  void  PrepareSecondary(const G4Track&);
+  G4Track* aSecondary;
+
+  void InitializeSecondaries(const G4Track&);
+};
+
+#endif