G4AdjointSimManager.hh

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// $Id$
//
//      Class Name: G4AdjointSimManager.hh
//  Author:         L. Desorgher
//  Organisation:   SpaceIT GmbH
//  Contract:   ESA contract 21435/08/NL/AT
//  Customer:       ESA/ESTEC
//
// CHANGE HISTORY
// --------------
//      ChangeHistory: 
//      -15-01-2007 creation by L. Desorgher
//      -March 2008 Redesigned as a non RunManager.  L. Desorgher
//      -01-11-2009 Add the possibility to use user defined run, event, tracking, stepping, 
//              and stacking actions during the adjoint tracking phase. L. Desorgher
//      
//              
//
//-------------------------------------------------------------
//  Documentation:
//      This class represents the Manager of an adjoint/reverse MC simulation. 
//      An adjoint run is divided in a serie of alternative adjoint and forward tracking 
//      of adjoint and normal particles.
//
//      Reverse tracking phase:
//      -----------------------
//      An adjoint particle of a given type  (adjoint_e-, adjoint_gamma,...) is first generated on the so called adjoint source
//      with a random energy (1/E distribution) and direction. The adjoint source is the 
//      external surface of a user defined volume or of a user defined sphere. The adjoint
//      source should contain one or several sensitive volumes and should be small 
//      compared to the entire geometry.
//      The user can set the min and max energy of the adjoint source. After its
//      generation the adjoint primary  particle is tracked 
//      bacward in the geometry till a user  defined external surface (spherical or boundary of a volume)
//      or is killed before if it reaches a user defined  upper energy limit that represents
//      the maximum energy of the external source. During the reverse tracking, reverse
//      processes take place where  the adjoint particle being tracked can be either scattered
//      or transformed in another type of adjoint paticle. During the reverse tracking the
//      G4SimulationManager replaces the user defined Primary, Run, ... actions, by its own actions.
//      
//      Forward tracking phase
//      -----------------------
//      When an adjoint particle reaches the external surface its weight,type,  position, 
//      and directions are registered and a  normal primary particle with a type equivalent to the last generated primary adjoint is
//      generated with the same energy, position but opposite direction  and is  tracked normally in the sensitive region as in a fwd MC simulation. 
//      During this forward tracking phase the  
//      event, stacking, stepping, tracking actions defined by the user for its general fwd application are used. By this clear separation between
//      adjoint and fwd tracking phases , the code of the user developed for a fwd simulation should be only slightly modified to adapt it for an adjoint 
//      simulation. Indeed  the computation of the signal is done by the same actions or classes that the one used in the fwd simulation mode.  
// 
//      Modification to brought in a existing G4 application to use the ReverseMC method
//      -------------------------------
//      In order to be able to use the ReverseMC method in his simulation, the user should modify its code as such:
//          1) Adapt its physics list to use ReverseProcesses for adjoint particles. An example of such physics list is provided in an extended 
//            example. 
//          2) Create an instance of    G4AdjointSimManager somewhere in the main code.
//          3) Modify the analysis part of the code to normalise the signal computed during the fwd phase to the weight of the last adjoint particle
//           that reaches the external surface. This is done by using the following method of G4AdjointSimManager.
//                   
//                   G4int GetIDOfLastAdjParticleReachingExtSource()                     
//                       G4ThreeVector GetPositionAtEndOfLastAdjointTrack(){ return last_pos;}
//                   G4ThreeVector GetDirectionAtEndOfLastAdjointTrack(){ return last_direction;}
//                   G4double GetEkinAtEndOfLastAdjointTrack(){ return last_ekin;} 
//                   G4double GetEkinNucAtEndOfLastAdjointTrack(){ return last_ekin_nuc;}
//                   G4double GetWeightAtEndOfLastAdjointTrack(){return last_weight;}
//                       G4double GetCosthAtEndOfLastAdjointTrack(){return last_cos_th;}
//                       G4String GetFwdParticleNameAtEndOfLastAdjointTrack(){return last_fwd_part_name;}
//                       G4int GetFwdParticlePDGEncodingAtEndOfLastAdjointTrack(){return last_fwd_part_PDGEncoding;}
//                       G4int GetFwdParticleIndexAtEndOfLastAdjointTrack().
//
//            In orther to have a code working for both forward and adjoint simulation mode, the extra code needed in user actions for the adjoint
//            simulation mode can be seperated to the code needed only for the normal forward  simulation by using the following method
//                       
//                  G4bool GetAdjointSimMode() that return true if   an adjoint simulation is running and false if not!
//                
//                Example of modification in the analysis part of the code:
//           -------------------------------------------------------------
//              Let say that in the forward simulation a G4 application computes the energy deposited in a volume.
//              The user wants to normalise its results for an external isotropic source of e- with differential spectrum given by f(E).
//              A possible modification of the code where the deposited energy Edep during an event  is registered would be the following  
//                  
//                  G4AdjointSimManager* theAdjSimManager =    G4AdjointSimManager::GetInstance();  
//              if (theAdjSimManager->GetAdjointSimMode()) {
//                  //code of the user that should be consider only for forwrad simulation
//                  G4double normalised_edep = 0.;
//                  if (theAdjSimManager->GetFwdParticleNameAtEndOfLastAdjointTrack() == "e-"){
//                      G4double ekin_prim = theAdjSimManager->GetEkinAtEndOfLastAdjointTrack();
//                      G4double weight_prim = theAdjSimManager->GetWeightAtEndOfLastAdjointTrack();
//                      normalised_edep = weight_prim*f(ekin_prim);
//                  } 
//                  //then follow the code where normalised_edep is printed, or registered or whatever ....
//              }   
//              
//              else { //code of the user that should be consider only for forward simulation
//              }
//              Note that in this example a normalisation to only primary e- with only one spectrum f(E) is considered. The example code could be easily
//              adapted for a normalisatin to several spectra and several type of primary particles  in the same simulation. 
//

#ifndef G4AdjointSimManager_h
#define G4AdjointSimManager_h 1
#include "globals.hh"
#include "G4ThreeVector.hh"
#include <vector>


class G4UserEventAction;
class G4VUserPrimaryGeneratorAction;
class G4UserTrackingAction;
class G4UserSteppingAction;
class G4UserStackingAction;
class G4UserRunAction;
class G4AdjointRunAction;
class G4AdjointPrimaryGeneratorAction;
class G4AdjointSteppingAction;
class G4AdjointEventAction;
class G4AdjointStackingAction;
class G4ParticleDefinition;
class G4AdjointSimMessenger;
class G4PhysicsLogVector;

class G4AdjointSimManager  
{
  public:
    
    static G4AdjointSimManager* GetInstance();

  public: //publich methods
    
    void RunAdjointSimulation(G4int nb_evt);
    
    inline G4int GetNbEvtOfLastRun(){return nb_evt_of_last_run;}
    
    void SetAdjointTrackingMode(G4bool aBool);
    inline G4bool GetAdjointTrackingMode(){return  adjoint_tracking_mode;} //true if an adjoint track is being processed
    inline G4bool GetAdjointSimMode(){return  adjoint_sim_mode;} //true if an adjoint simulation is running

    G4bool GetDidAdjParticleReachTheExtSource();
    void RegisterAtEndOfAdjointTrack();
    void RegisterAdjointPrimaryWeight(G4double aWeight);

    inline G4int GetIDOfLastAdjParticleReachingExtSource(){return ID_of_last_particle_that_reach_the_ext_source;};                   
    inline G4ThreeVector GetPositionAtEndOfLastAdjointTrack(){ return last_pos;}
    inline G4ThreeVector GetDirectionAtEndOfLastAdjointTrack(){ return last_direction;}
    inline G4double GetEkinAtEndOfLastAdjointTrack(){ return last_ekin;} 
    inline G4double GetEkinNucAtEndOfLastAdjointTrack(){ return last_ekin_nuc;}
    inline G4double GetWeightAtEndOfLastAdjointTrack(){return last_weight;}
    inline G4double GetCosthAtEndOfLastAdjointTrack(){return last_cos_th;}
    inline const G4String& GetFwdParticleNameAtEndOfLastAdjointTrack(){return last_fwd_part_name;}
    inline G4int GetFwdParticlePDGEncodingAtEndOfLastAdjointTrack(){return last_fwd_part_PDGEncoding;}
    inline G4int GetFwdParticleIndexAtEndOfLastAdjointTrack(){return last_fwd_part_index;}
    
    std::vector<G4ParticleDefinition*> GetListOfPrimaryFwdParticles();
     
    G4bool DefineSphericalExtSource(G4double radius, G4ThreeVector pos);
    G4bool DefineSphericalExtSourceWithCentreAtTheCentreOfAVolume(G4double radius, const G4String& volume_name);
    G4bool DefineExtSourceOnTheExtSurfaceOfAVolume(const G4String& volume_name);
    void SetExtSourceEmax(G4double Emax);
    
    //Definition of adjoint source
    //---------------------------- 
     
    G4bool DefineSphericalAdjointSource(G4double radius, G4ThreeVector pos);
    G4bool DefineSphericalAdjointSourceWithCentreAtTheCentreOfAVolume(G4double radius, const G4String& volume_name);
    G4bool DefineAdjointSourceOnTheExtSurfaceOfAVolume(const G4String& volume_name);
    void SetAdjointSourceEmin(G4double Emin);
    void SetAdjointSourceEmax(G4double Emax);
    inline G4double GetAdjointSourceArea(){return area_of_the_adjoint_source;} 
    void ConsiderParticleAsPrimary(const G4String& particle_name);
    void NeglectParticleAsPrimary(const G4String& particle_name);
    void SetPrimaryIon(G4ParticleDefinition* adjointIon, G4ParticleDefinition* fwdIon);
    const G4String& GetPrimaryIonName();
    
    inline void SetNormalisationMode(G4int n){normalisation_mode=n;};
    G4int GetNormalisationMode(){return normalisation_mode;};
    G4double GetNumberNucleonsInIon(){return nb_nuc;};

    //Definition of user actions for the adjoint tracking phase
    //---------------------------- 
    void SetAdjointEventAction(G4UserEventAction* anAction);
    void SetAdjointSteppingAction(G4UserSteppingAction* anAction);
    void SetAdjointStackingAction(G4UserStackingAction* anAction);
    void SetAdjointTrackingAction(G4UserTrackingAction* anAction);
    void SetAdjointRunAction(G4UserRunAction* anAction); 
    
    //Set methods for user run actions
    //--------------------------------
    inline void UseUserStackingActionInFwdTrackingPhase(G4bool aBool){use_user_StackingAction=aBool;}

    //Convergence test
    //-----------------------
   /*
    void RegisterSignalForConvergenceTest(G4double aSignal);
    void DefineExponentialPrimarySpectrumForConvergenceTest(G4ParticleDefinition* aPartDef, G4double E0);
    void DefinePowerLawPrimarySpectrumForConvergenceTest(G4ParticleDefinition* aPartDef, G4double alpha);
     
   */ 

  private: 
  
    static G4AdjointSimManager* instance;
  
  private: // methods
    
    void SetRestOfAdjointActions(); 
    void SetAdjointPrimaryRunAndStackingActions();
    void ResetRestOfUserActions(); 
    void ResetUserPrimaryRunAndStackingActions(); 
    void DefineUserActions();

  private: //constructor and destructor
  
    G4AdjointSimManager();
   ~G4AdjointSimManager();

  private ://attributes
  
  //Messenger
  //----------
    G4AdjointSimMessenger* theMessenger;
  
  //user defined actions for the normal fwd simulation. Taken from the G4RunManager
  //-------------------------------------------------
    bool user_action_already_defined;
    G4UserRunAction*        fUserRunAction;
    G4UserEventAction*      fUserEventAction;
    G4VUserPrimaryGeneratorAction*  fUserPrimaryGeneratorAction;
    G4UserTrackingAction*   fUserTrackingAction;
    G4UserSteppingAction*   fUserSteppingAction;
    G4UserStackingAction*   fUserStackingAction;
    bool use_user_StackingAction; //only for fwd part of the adjoint simulation
    
  //action for adjoint simulation
  //-----------------------------
    G4UserRunAction*        theAdjointRunAction;
    G4UserEventAction*      theAdjointEventAction;
    G4AdjointPrimaryGeneratorAction* theAdjointPrimaryGeneratorAction;
    G4UserTrackingAction*   theAdjointTrackingAction;
    G4AdjointSteppingAction*    theAdjointSteppingAction;
    G4AdjointStackingAction*    theAdjointStackingAction;
      
  //adjoint mode
  //-------------
    G4bool adjoint_tracking_mode;
    G4bool adjoint_sim_mode;   

  //adjoint particle information on the external surface
  //----------------------------- 
    G4ThreeVector last_pos;
    G4ThreeVector last_direction;
    G4double last_ekin,last_ekin_nuc; //last_ekin_nuc=last_ekin/nuc, nuc is 1 if not a nucleus
    G4double last_cos_th;
    G4String last_fwd_part_name;
    G4int  last_fwd_part_PDGEncoding;
    G4int  last_fwd_part_index;
    G4double last_weight;
    G4int ID_of_last_particle_that_reach_the_ext_source;
      
    G4int nb_evt_of_last_run;
    G4int normalisation_mode;
     
  //Adjoint source
  //--------------
    G4double area_of_the_adjoint_source; 
    G4double nb_nuc;
    G4double theAdjointPrimaryWeight;

    //Weight Analysis
    //----------
    G4PhysicsLogVector* electron_last_weight_vector;
    G4PhysicsLogVector* proton_last_weight_vector;
    G4PhysicsLogVector* gamma_last_weight_vector;
    
    G4bool welcome_message;
    
/* For the future    
    //Convergence test
    //----------------
      
     G4double normalised_signal;
     G4double error_signal;
     G4bool convergence_test_is_used;
     G4bool power_law_spectrum_for_convergence_test; // true  PowerLaw, ;
     G4ParticleDefinition* the_par_def_for_convergence_test;
*/     
 
};

#endif