SiTrivialInduceChargeOnStrips Class Reference

#include <SiTrivialInduceChargeOnStrips.h>

Inheritance diagram for SiTrivialInduceChargeOnStrips:

List of all members.

Public Member Functions
void	induce (const SiChargeCollectionDrifter::collection_type &collection_points, const StripGeomDetUnit &det, std::vector< double > &localAmplitudes, size_t &recordMinAffectedStrip, size_t &recordMaxAffectedStrip) const
	SiTrivialInduceChargeOnStrips (const edm::ParameterSet &conf, double g)
virtual	~SiTrivialInduceChargeOnStrips ()
Private Member Functions
double	chargeDeposited (size_t strip, size_t Nstrips, double amplitude, double chargeSpread, double chargePosition) const
Static Private Member Functions
static unsigned int	indexOf (const std::string &)
static unsigned int	typeOf (const StripGeomDetUnit &)
Private Attributes
const double	geVperElectron
const double	Nsigma
const std::vector< std::vector < double > >	signalCoupling
Static Private Attributes
static const int	Ntypes = 14
static const std::string	type [] = { "IB1", "IB2","OB1","OB2","W1a","W2a","W3a","W1b","W2b","W3b","W4","W5","W6","W7"}

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Detailed Description

Definition at line 7 of file SiTrivialInduceChargeOnStrips.h.

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Constructor & Destructor Documentation

SiTrivialInduceChargeOnStrips::SiTrivialInduceChargeOnStrips	(	const edm::ParameterSet &	conf,
		double	g
	)

Definition at line 54 of file SiTrivialInduceChargeOnStrips.cc.

  : signalCoupling(fillSignalCoupling(conf, Ntypes, type)), Nsigma(3.), geVperElectron(g)  {
}

virtual SiTrivialInduceChargeOnStrips::~SiTrivialInduceChargeOnStrips

(

)

[inline, virtual]

Definition at line 10 of file SiTrivialInduceChargeOnStrips.h.

{}

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Member Function Documentation

double SiTrivialInduceChargeOnStrips::chargeDeposited	(	size_t	strip,
		size_t	Nstrips,
		double	amplitude,
		double	chargeSpread,
		double	chargePosition
	)		const [inline, private]

Definition at line 98 of file SiTrivialInduceChargeOnStrips.cc.

References approx_erf(), and geVperElectron.

Referenced by induce().

                                                                                                                  {

  double integralUpToStrip = (strip == 0)         ? 0. : ( approx_erf(   (strip-chargePosition)/chargeSpread/1.41421356237309515 ) );
  double integralUpToNext  = (strip+1 == Nstrips) ? 1. : ( approx_erf(   (strip+1-chargePosition)/chargeSpread/1.41421356237309515 ) );
  
  return  0.5 * (integralUpToNext - integralUpToStrip) * amplitude / geVperElectron;
}

unsigned int SiTrivialInduceChargeOnStrips::indexOf

(

const std::string &

t

)

[inline, static, private]

Definition at line 38 of file SiTrivialInduceChargeOnStrips.cc.

References spr::find(), Ntypes, and type.

Referenced by typeOf().

{ return std::find( type, type + Ntypes, t) - type;}

void SiTrivialInduceChargeOnStrips::induce	(	const SiChargeCollectionDrifter::collection_type &	collection_points,
		const StripGeomDetUnit &	det,
		std::vector< double > &	localAmplitudes,
		size_t &	recordMinAffectedStrip,
		size_t &	recordMaxAffectedStrip
	)		const [virtual]

Implements SiInduceChargeOnStrips.

Definition at line 60 of file SiTrivialInduceChargeOnStrips.cc.

References abs, chargeDeposited(), StripTopology::localPitch(), max(), min, Nsigma, StripTopology::nstrips(), signalCoupling, StripGeomDetUnit::specificTopology(), strip(), StripTopology::strip(), and typeOf().

                                             {

  const std::vector<double>& coupling = signalCoupling.at(typeOf(det));
  const StripTopology& topology = dynamic_cast<const StripTopology&>(det.specificTopology());
  size_t Nstrips =  topology.nstrips();

  for (SiChargeCollectionDrifter::collection_type::const_iterator 
         signalpoint = collection_points.begin();  signalpoint != collection_points.end();  signalpoint++ ) {
    
    //In strip coordinates:
    double chargePosition = topology.strip(signalpoint->position());
    double chargeSpread = signalpoint->sigma() / topology.localPitch(signalpoint->position());
    
    size_t fromStrip  = size_t(std::max( 0,          int(std::floor( chargePosition - Nsigma*chargeSpread))));
    size_t untilStrip = size_t(std::min( Nstrips, size_t(std::ceil( chargePosition + Nsigma*chargeSpread) )));
    for (size_t strip = fromStrip;  strip < untilStrip; strip++) {

      double chargeDepositedOnStrip = chargeDeposited( strip, Nstrips, signalpoint->amplitude(), chargeSpread, chargePosition);

      size_t affectedFromStrip  = size_t(std::max( 0, int(strip - coupling.size() + 1)));
      size_t affectedUntilStrip = size_t(std::min( Nstrips, strip + coupling.size())   );  
      for (size_t affectedStrip = affectedFromStrip;  affectedStrip < affectedUntilStrip;  affectedStrip++) {
        localAmplitudes.at( affectedStrip ) += chargeDepositedOnStrip * coupling.at(abs( affectedStrip - strip )) ;
      }

      if( affectedFromStrip  < recordMinAffectedStrip ) recordMinAffectedStrip = affectedFromStrip;
      if( affectedUntilStrip > recordMaxAffectedStrip ) recordMaxAffectedStrip = affectedUntilStrip;
    }
  }
  return;
}

unsigned int SiTrivialInduceChargeOnStrips::typeOf

(

const StripGeomDetUnit &

det

)

[inline, static, private]

Definition at line 42 of file SiTrivialInduceChargeOnStrips.cc.

References Exception, GeomDet::geographicalId(), indexOf(), TIBDetId::layer(), TIDDetId::ring(), TECDetId::ring(), StripGeomDetUnit::specificType(), GeomDetEnumerators::TEC, GeomDetEnumerators::TIB, GeomDetEnumerators::TID, and GeomDetEnumerators::TOB.

Referenced by induce().

                                    {
  DetId id = det.geographicalId();
  switch (det.specificType().subDetector()) {
  case GeomDetEnumerators::TIB: {return (TIBDetId(id).layer() < 3) ? indexOf("IB1") : indexOf("IB2");}
  case GeomDetEnumerators::TOB: {return (TOBDetId(id).layer() > 4) ? indexOf("OB1") : indexOf("OB2");}
  case GeomDetEnumerators::TID: {return indexOf("W1a") -1 + TIDDetId(id).ring();} //fragile: relies on ordering of 'type'
  case GeomDetEnumerators::TEC: {return indexOf("W1b") -1 + TECDetId(id).ring();} //fragile: relies on ordering of 'type'
  default: throw cms::Exception("Invalid subdetector") << id();
  }
}

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Member Data Documentation

const double SiTrivialInduceChargeOnStrips::geVperElectron [private]

Definition at line 30 of file SiTrivialInduceChargeOnStrips.h.

Referenced by chargeDeposited().

const double SiTrivialInduceChargeOnStrips::Nsigma [private]

Definition at line 29 of file SiTrivialInduceChargeOnStrips.h.

Referenced by induce().

const int SiTrivialInduceChargeOnStrips::Ntypes = 14 [static, private]

Definition at line 26 of file SiTrivialInduceChargeOnStrips.h.

Referenced by indexOf().

const std::vector<std::vector<double> > SiTrivialInduceChargeOnStrips::signalCoupling [private]

Definition at line 27 of file SiTrivialInduceChargeOnStrips.h.

Referenced by induce().

const std::string SiTrivialInduceChargeOnStrips::type = { "IB1", "IB2","OB1","OB2","W1a","W2a","W3a","W1b","W2b","W3b","W4","W5","W6","W7"} [static, private]

Definition at line 25 of file SiTrivialInduceChargeOnStrips.h.

Referenced by indexOf().