FTM_HitProcess Class Reference

#include <FTM_hitprocess.h>

Inheritance diagram for FTM_HitProcess:

Collaboration diagram for FTM_HitProcess:

Public Member Functions
	~FTM_HitProcess ()
PH_output	ProcessHit (MHit *, gemc_opts)
	Method to process the hit. More...
vector< identifier >	ProcessID (vector< identifier >, G4Step *, detector, gemc_opts)
	Method to calculate new identifier. More...
Public Member Functions inherited from MPHBaseClass
virtual	~MPHBaseClass ()

Static Public Member Functions
static MPHBaseClass *	createHitClass ()

Additional Inherited Members
Data Fields inherited from MPHBaseClass
string	HCname
	Hit Collection name. More...
map< string, double >	gpars

Detailed Description

FTM_HitProcess

The forward tagger micromegas hit process routine includes:

• conversion of the deposited energy into a number of electrons: the deposited energy provided by Geant4 is used to estimate the average number of electrons created in the MM sensitive volume (knowing the mean ionization potential of the gas). If the deposited energy is smaller than the ionization potential (roughly 25 eV), then the hit is discarded
• generation of a transverse diffusion: for each electron created at the previous step, a transverse diffusion is generated on a Gaussian. The width of this Gaussian is obtained by the standard formula for diffusion, i.e. proportional to the square root of the distance between the interaction point and the micro-mesh.
• determination of the strip: the final transverse position of each electron (after transverse diffusion) is converted into a strip number (the closest one).
• determination of the energy collected on the closest strip: if N electrons have been created for the deposited energy Edep, the energy associated to the current strip is Edep/N. Note that this assumes no gain fluctuation. A more realistic treatment (not yet implemented) would be to generate a gain for each electron, using a Polya distribution.
• check of the acceptance: if the strip number is negative or larger than the total number of strips, it is discarded (associated value is -1).

  Author

  
  S. Procureur, G. Charles, M. Ungaro

  mail: sebas.nosp@m.tien.nosp@m..proc.nosp@m.ureu.nosp@m.r@cea.nosp@m..fr, gabri.nosp@m.el.c.nosp@m.harle.nosp@m.s@ce.nosp@m.a.fr, ungar.nosp@m.o@jl.nosp@m.ab.or.nosp@m.g
  
  
  

Definition at line 24 of file FTM_hitprocess.h.

Constructor & Destructor Documentation

FTM_HitProcess::~FTM_HitProcess ( )

inline

Definition at line 27 of file FTM_hitprocess.h.

Member Function Documentation

static MPHBaseClass* FTM_HitProcess::createHitClass ( )

inlinestatic

Definition at line 30 of file FTM_hitprocess.h.

PH_output FTM_HitProcess::ProcessHit ( MHit *  aHit, gemc_opts  Opt  )

virtual

Implements MPHBaseClass.

Definition at line 7 of file FTM_hitprocess.cc.

vector< identifier > FTM_HitProcess::ProcessID ( vector< identifier >  id, G4Step *  aStep, detector  Detector, gemc_opts  Opt  )

virtual

Implements MPHBaseClass.

Definition at line 104 of file FTM_hitprocess.cc.