SiHitDigitizer Class Reference

#include <SiHitDigitizer.h>

Public Member Functions
void	processHit (const PSimHit *, const StripGeomDetUnit &, GlobalVector, float, std::vector< double > &, size_t &, size_t &)
void	setChargeCollectionDrifter (SiChargeCollectionDrifter *cd)
void	setChargeDivider (SiChargeDivider *cd)
void	setInduceChargeOnStrips (SiInduceChargeOnStrips *cd)
void	setParticleDataTable (const ParticleDataTable *pdt)
	SiHitDigitizer (const edm::ParameterSet &conf, CLHEP::HepRandomEngine &)
	~SiHitDigitizer ()

Private Types
typedef GloballyPositioned < double >	Frame

Private Member Functions
LocalVector	DriftDirection (const StripGeomDetUnit *_detp, GlobalVector _bfield, float langle)

Private Attributes
double	appliedVoltage
double	chargeDistributionRMS
double	chargeMobility
edm::ParameterSet	conf_
double	depletionVoltage
double	gevperelectron
bool	noDiffusion
CLHEP::HepRandomEngine &	rndEngine
double	temperature
SiChargeCollectionDrifter *	theSiChargeCollectionDrifter
SiChargeDivider *	theSiChargeDivider
SiInduceChargeOnStrips *	theSiInduceChargeOnStrips

Detailed Description

Digitizes the response for a single SimHit.

Definition at line 27 of file SiHitDigitizer.h.

Member Typedef Documentation

typedef GloballyPositioned<double> SiHitDigitizer::Frame

private

Definition at line 69 of file SiHitDigitizer.h.

Constructor & Destructor Documentation

SiHitDigitizer::SiHitDigitizer	(	const edm::ParameterSet &	conf,
		CLHEP::HepRandomEngine &	eng
	)

Definition at line 14 of file SiHitDigitizer.cc.

References appliedVoltage, CBOLTZ, chargeDistributionRMS, chargeMobility, conf_, depletionVoltage, e_SI, edm::ParameterSet::getParameter(), gevperelectron, noDiffusion, rndEngine, temperature, theSiChargeCollectionDrifter, theSiChargeDivider, and theSiInduceChargeOnStrips.

                                                                                    :conf_(conf),rndEngine(eng){
  
  // Construct default classes
  depletionVoltage       = conf_.getParameter<double>("DepletionVoltage");
  appliedVoltage         = conf_.getParameter<double>("AppliedVoltage");
  chargeMobility         = conf_.getParameter<double>("ChargeMobility");
  temperature            = conf_.getParameter<double>("Temperature");
  gevperelectron         = conf_.getParameter<double>("GevPerElectron");
  chargeDistributionRMS  = conf_.getParameter<double>("ChargeDistributionRMS");
  noDiffusion            = conf_.getParameter<bool>("noDiffusion");
  double diffusionConstant = CBOLTZ/e_SI * chargeMobility * temperature;
  if (noDiffusion) diffusionConstant *= 1.0e-3;
  
  theSiChargeDivider = new SiLinearChargeDivider(conf_,rndEngine);
  
  theSiChargeCollectionDrifter = 
    new SiLinearChargeCollectionDrifter(diffusionConstant,
                    chargeDistributionRMS,
                    depletionVoltage,
                    appliedVoltage);

  theSiInduceChargeOnStrips = new SiTrivialInduceChargeOnStrips(conf,gevperelectron);
}

SiHitDigitizer::~SiHitDigitizer

(

)

Definition at line 38 of file SiHitDigitizer.cc.

References theSiChargeCollectionDrifter, theSiChargeDivider, and theSiInduceChargeOnStrips.

                               {
  delete theSiChargeDivider;
  delete theSiChargeCollectionDrifter;
  delete theSiInduceChargeOnStrips;
}

Member Function Documentation

LocalVector SiHitDigitizer::DriftDirection ( const StripGeomDetUnit *  _detp, GlobalVector  _bfield, float  langle  )

inlineprivate

Definition at line 71 of file SiHitDigitizer.h.

References GloballyPositioned< T >::position(), GloballyPositioned< T >::rotation(), GeomDet::surface(), toLocal(), PV3DBase< T, PVType, FrameType >::x(), and PV3DBase< T, PVType, FrameType >::y().

Referenced by processHit().

                                                                                                {
    LocalVector Bfield=Frame(_detp->surface().position(),_detp->surface().rotation()).toLocal(_bfield);
    return LocalVector(-langle * Bfield.y(),langle * Bfield.x(),1.);
  }

void SiHitDigitizer::processHit	(	const PSimHit *	hit,
		const StripGeomDetUnit &	det,
		GlobalVector	bfield,
		float	langle,
		std::vector< double > &	locAmpl,
		size_t &	firstChannelWithSignal,
		size_t &	lastChannelWithSignal
	)

Definition at line 45 of file SiHitDigitizer.cc.

References BoundSurface::bounds(), chargeMobility, depletionVoltage, SiChargeDivider::divide(), SiChargeCollectionDrifter::drift(), DriftDirection(), SiInduceChargeOnStrips::induce(), GeomDet::specificSurface(), theSiChargeCollectionDrifter, theSiChargeDivider, theSiInduceChargeOnStrips, and Bounds::thickness().

Referenced by SiStripDigitizerAlgorithm::run().

                                                                                                         {
  
  // Compute the drift direction for this det
  double moduleThickness = det.specificSurface().bounds().thickness(); // active detector thicness
  double timeNormalisation = (moduleThickness*moduleThickness)/(2.*depletionVoltage*chargeMobility);
  LocalVector driftDir = DriftDirection(&det,bfield,langle);
  
  // Fully process one SimHit
  theSiInduceChargeOnStrips->induce(
      theSiChargeCollectionDrifter->drift(
          theSiChargeDivider->divide(hit, driftDir, moduleThickness, det),
          driftDir,moduleThickness,timeNormalisation),
      det,locAmpl,firstChannelWithSignal,lastChannelWithSignal);
}

void SiHitDigitizer::setChargeCollectionDrifter ( SiChargeCollectionDrifter *  cd )

inline

Definition at line 39 of file SiHitDigitizer.h.

References theSiChargeCollectionDrifter.

                                                                 {
    if (theSiChargeCollectionDrifter) delete theSiChargeCollectionDrifter;
    theSiChargeCollectionDrifter = cd;
  }

void SiHitDigitizer::setChargeDivider ( SiChargeDivider *  cd )

inline

Definition at line 34 of file SiHitDigitizer.h.

References theSiChargeDivider.

                                             {
    if (theSiChargeDivider) delete theSiChargeDivider;
    theSiChargeDivider = cd;
  }

void SiHitDigitizer::setInduceChargeOnStrips ( SiInduceChargeOnStrips *  cd )

inline

Definition at line 44 of file SiHitDigitizer.h.

References theSiInduceChargeOnStrips.

                                                           {
    if (theSiInduceChargeOnStrips) delete theSiInduceChargeOnStrips;
    theSiInduceChargeOnStrips = cd;
  }

void SiHitDigitizer::setParticleDataTable ( const ParticleDataTable *  pdt )

inline

Definition at line 49 of file SiHitDigitizer.h.

References SiChargeDivider::setParticleDataTable(), and theSiChargeDivider.

Referenced by SiStripDigitizerAlgorithm::setParticleDataTable().

                                                           { 
    theSiChargeDivider->setParticleDataTable(pdt); 
  }

Member Data Documentation

double SiHitDigitizer::appliedVoltage

private

Definition at line 63 of file SiHitDigitizer.h.

Referenced by SiHitDigitizer().

double SiHitDigitizer::chargeDistributionRMS

private

Definition at line 67 of file SiHitDigitizer.h.

Referenced by SiHitDigitizer().

double SiHitDigitizer::chargeMobility

private

Definition at line 64 of file SiHitDigitizer.h.

Referenced by processHit(), and SiHitDigitizer().

edm::ParameterSet SiHitDigitizer::conf_

private

Definition at line 60 of file SiHitDigitizer.h.

Referenced by SiHitDigitizer().

double SiHitDigitizer::depletionVoltage

private

Definition at line 62 of file SiHitDigitizer.h.

Referenced by processHit(), and SiHitDigitizer().

double SiHitDigitizer::gevperelectron

private

Definition at line 68 of file SiHitDigitizer.h.

Referenced by SiHitDigitizer().

bool SiHitDigitizer::noDiffusion

private

Definition at line 66 of file SiHitDigitizer.h.

Referenced by SiHitDigitizer().

CLHEP::HepRandomEngine& SiHitDigitizer::rndEngine

private

Definition at line 61 of file SiHitDigitizer.h.

Referenced by SiHitDigitizer().

double SiHitDigitizer::temperature

private

Definition at line 65 of file SiHitDigitizer.h.

Referenced by SiHitDigitizer().

SiChargeCollectionDrifter* SiHitDigitizer::theSiChargeCollectionDrifter

private

Definition at line 58 of file SiHitDigitizer.h.

Referenced by processHit(), setChargeCollectionDrifter(), SiHitDigitizer(), and ~SiHitDigitizer().

SiChargeDivider* SiHitDigitizer::theSiChargeDivider

private

Definition at line 57 of file SiHitDigitizer.h.

Referenced by processHit(), setChargeDivider(), setParticleDataTable(), SiHitDigitizer(), and ~SiHitDigitizer().

SiInduceChargeOnStrips* SiHitDigitizer::theSiInduceChargeOnStrips

private

Definition at line 59 of file SiHitDigitizer.h.

Referenced by processHit(), setInduceChargeOnStrips(), SiHitDigitizer(), and ~SiHitDigitizer().