#include <CSCCrossGap.h>

Public Member Functions
void	addCluster (LocalPoint here)
void	addElectrons (int nelec=1)
void	addElectronToBack ()
void	addEloss (float eloss)
void	addStep (double step)
double	beta2 () const
	CSCCrossGap (double mass, float mom, LocalVector gap)
std::vector< int >	electrons () const
std::vector< float >	eLossPerStep () const
double	gamma () const
LocalVector	gapVector () const
std::vector< LocalPoint >	ionClusters () const
float	length () const
double	logGamma (double mass, float momentum)
double	logGamma ()
int	noOfClusters () const
int	noOfElectrons () const
int	noOfElosses () const
int	noOfSteps () const
std::vector< double >	stepLengths () const
LocalVector	unitVector () const
	~CSCCrossGap ()
Private Attributes
std::vector< LocalPoint >	clusters
std::vector< int >	electronsInClusters
std::vector< float >	elosses
double	loggam
std::vector< double >	steps
double	theBeta2
double	theGamma
LocalVector	theGap

Detailed Description

Class used to represent one CSC gas gap crossing by a charged track.

Author:: Tim Cox

This is used by CSCCSCGasCollisions in the digitization of the CSCs. Actually this may NOT model the whole gas gap, but just the path length corresponding to a PSimHit in the gap (i.e. from the PSimHit 'entry point' to its 'exit point'). PSimHit's can have a pretty evanescent existence and I can't pretend to have a full understanding of their full range of characteristics. Yet another thing 'to be studied'.

Definition at line 22 of file CSCCrossGap.h.

Constructor & Destructor Documentation

CSCCrossGap::CSCCrossGap	(	double	mass,
		float	mom,
		LocalVector	gap
	)

iam = particle type in PDG code. mom = momentum of particle gap = space std::vector representing the hit entry and exit

Definition at line 6 of file CSCCrossGap.cc.

References length(), logGamma(), and LogTrace.

: theBeta2(0.),
  theGamma(1.),
  loggam(0.),
  theGap(gap),
  clusters(),
  electronsInClusters(),
  steps(),
  elosses()
{
  logGamma( mass, mom);
  LogTrace("CSCCrossGap")
     << "CSCCrossGap: simhit \n"
     << "mass = " << mass << "GeV/c2, momentum = " << mom << 
       " GeV/c, gap length = " << length() << " cm \n";
}

CSCCrossGap::~CSCCrossGap ( ) [inline]

Definition at line 31 of file CSCCrossGap.h.

{};

Member Function Documentation

void CSCCrossGap::addCluster ( LocalPoint here ) [inline]

Definition at line 42 of file CSCCrossGap.h.

References clusters.

Referenced by CSCGasCollisions::ionize().

{ clusters.push_back( here ); }

void CSCCrossGap::addElectrons ( int nelec = 1 ) [inline]

Definition at line 43 of file CSCCrossGap.h.

References electronsInClusters.

Referenced by CSCGasCollisions::ionize().

{ electronsInClusters.push_back( nelec ); }

void CSCCrossGap::addElectronToBack ( ) [inline]

Definition at line 44 of file CSCCrossGap.h.

References electronsInClusters.

Referenced by CSCGasCollisions::ionize().

{ ++electronsInClusters.back(); }

void CSCCrossGap::addEloss ( float eloss ) [inline]

Definition at line 47 of file CSCCrossGap.h.

References elosses.

{ elosses.push_back( eloss ); }

void CSCCrossGap::addStep ( double step ) [inline]

Definition at line 46 of file CSCCrossGap.h.

References steps.

{ steps.push_back( step ); }

double CSCCrossGap::beta2 ( ) const [inline]

Definition at line 51 of file CSCCrossGap.h.

References theBeta2.

Referenced by CSCGasCollisions::generateEnergyLoss().

{ return theBeta2; }

std::vector<int> CSCCrossGap::electrons ( ) const [inline]

Definition at line 35 of file CSCCrossGap.h.

References electronsInClusters.

Referenced by CSCGasCollisions::simulate(), and CSCGasCollisions::writeSummary().

{ return electronsInClusters; }

std::vector<float> CSCCrossGap::eLossPerStep ( ) const [inline]

Definition at line 39 of file CSCCrossGap.h.

References elosses.

Referenced by CSCGasCollisions::writeSummary().

{ return elosses; }

double CSCCrossGap::gamma ( ) const [inline]

Definition at line 52 of file CSCCrossGap.h.

References theGamma.

Referenced by CSCGasCollisions::generateEnergyLoss().

{ return theGamma; }

LocalVector CSCCrossGap::gapVector ( ) const [inline]

Definition at line 53 of file CSCCrossGap.h.

References theGap.

{ return theGap; }

std::vector<LocalPoint> CSCCrossGap::ionClusters ( ) const [inline]

Definition at line 33 of file CSCCrossGap.h.

References clusters.

Referenced by CSCGasCollisions::simulate(), and CSCGasCollisions::writeSummary().

{ return clusters; }

float CSCCrossGap::length ( void ) const [inline]

Definition at line 55 of file CSCCrossGap.h.

References PV3DBase< T, PVType, FrameType >::mag(), and theGap.

Referenced by CSCCrossGap(), and CSCGasCollisions::simulate().

{ return theGap.mag(); }

double CSCCrossGap::logGamma ( ) [inline]

Definition at line 50 of file CSCCrossGap.h.

References loggam.

Referenced by CSCCrossGap().

{ return loggam; }

double CSCCrossGap::logGamma	(	double	mass,
		float	momentum
	)

Definition at line 23 of file CSCCrossGap.cc.

References funct::log(), loggam, LogTrace, max(), mathSSE::sqrt(), theBeta2, and theGamma.

Referenced by CSCGasCollisions::simulate().

{
  theGamma = sqrt((mom/mass)*(mom/mass) + 1. );
  theBeta2 = 1. - 1./(theGamma*theGamma);
  double betgam = sqrt(theGamma*theGamma -1.);
  LogTrace("CSCCrossGap") << "gamma = " << theGamma << ", beta2 = " << theBeta2 <<
    ", beta*gamma = " << betgam;

  // The lowest value in table (=theGammaBins[0]) is ln(1.1)=0.0953102
  // (Compensate later if lower)
  loggam = log( std::max(1.1, theGamma ) ); // F-P literal IS double by default!
  LogTrace("CSCCrossGap") << "logGamma = " << loggam;

  return loggam;
}