FMT_HitProcess Class Reference

#include <FMT_hitprocess.h>

Inheritance diagram for FMT_HitProcess:

Collaboration diagram for FMT_HitProcess:

Public Member Functions
	~FMT_HitProcess ()
map< string, double >	integrateDgt (MHit *, int)
map< string, vector< int > >	multiDgt (MHit *, int)
vector< identifier >	processID (vector< identifier >, G4Step *, detector)
Public Member Functions inherited from HitProcess
virtual	~HitProcess ()
void	init (string name, goptions go, map< string, double > gp)
virtual void	init_subclass ()
map< string, double >	integrateRaw (MHit *, int, bool)
map< string, vector< double > >	allRaws (MHit *, int)
virtual map< double, double >	signalVT (MHit *, int)

Static Public Member Functions
static HitProcess *	createHitClass ()

Additional Inherited Members
Protected Member Functions inherited from HitProcess
double	DGauss (double x, double *par, double Edep, double stepTime)
Protected Attributes inherited from HitProcess
string	HCname
goptions	gemcOpt
map< string, double >	gpars
double	verbosity
string	log_msg
double	par [4]

Detailed Description

FMT_HitProcess

The forward 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. Because of the focusing magnetic field, the amplitude of the transverse diffusion is considerably reduced compared to the BMT.
• 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 32 of file FMT_hitprocess.h.

Constructor & Destructor Documentation

FMT_HitProcess::~FMT_HitProcess ( )

inline

Definition at line 36 of file FMT_hitprocess.h.

Member Function Documentation

static HitProcess* FMT_HitProcess::createHitClass ( )

inlinestatic

Definition at line 49 of file FMT_hitprocess.h.

map< string, double > FMT_HitProcess::integrateDgt ( MHit *  aHit, int  hitn  )

virtual

Implements HitProcess.

Definition at line 9 of file FMT_hitprocess.cc.

map< string, vector< int > > FMT_HitProcess::multiDgt ( MHit *  aHit, int  hitn  )

virtual

Implements HitProcess.

Definition at line 103 of file FMT_hitprocess.cc.

vector< identifier > FMT_HitProcess::processID ( vector< identifier >  id, G4Step *  aStep, detector  Detector  )

virtual

Implements HitProcess.

Definition at line 38 of file FMT_hitprocess.cc.