#include <SiLinearChargeCollectionDrifter.h>

Inheritance diagram for SiLinearChargeCollectionDrifter:

Public Member Functions
SiChargeCollectionDrifter::collection_type	drift (const SiChargeCollectionDrifter::ionization_type &, const LocalVector &, double, double)

	SiLinearChargeCollectionDrifter (double, double, double, double)

Public Member Functions inherited from SiChargeCollectionDrifter
virtual	~SiChargeCollectionDrifter ()

Private Member Functions
SignalPoint	drift (const EnergyDepositUnit &, const LocalVector &, double, double)

Private Attributes
const double	appliedVoltage

const double	chargeDistributionRMS

const double	depletionVoltage

const double	diffusionConstant

Additional Inherited Members
Public Types inherited from SiChargeCollectionDrifter
typedef std::vector< SignalPoint >	collection_type

typedef std::vector< EnergyDepositUnit >	ionization_type

Detailed Description

Concrete implementation of SiChargeCollectionDrifter. Drifts the charges linearly. Drift each energy deposits in the bulk to the surface. The resulting position depends on the Lorentz angle, and a sigma is computed that describes the diffusion.

Definition at line 12 of file SiLinearChargeCollectionDrifter.h.

Constructor & Destructor Documentation

SiLinearChargeCollectionDrifter::SiLinearChargeCollectionDrifter	(	double	dc,
		double	cdr,
		double	dv,
		double	av
	)

Definition at line 4 of file SiLinearChargeCollectionDrifter.cc.

                                             :
   // Everything which does not depend on the specific det
   diffusionConstant(dc),
   chargeDistributionRMS(cdr),
   depletionVoltage(dv),
   appliedVoltage(av)
 {
 }

Member Function Documentation

SiChargeCollectionDrifter::collection_type SiLinearChargeCollectionDrifter::drift	(	const SiChargeCollectionDrifter::ionization_type &	ion,
		const LocalVector &	driftDir,
		double	mt,
		double	tn
	)

virtual

Implements SiChargeCollectionDrifter.

Definition at line 16 of file SiLinearChargeCollectionDrifter.cc.

References mps_fire::i.

                                                                                             {
   // prepare output
   collection_type _temp;
   _temp.resize(ion.size());
   // call the drift method for each deposit
   for (size_t i=0; i<ion.size(); i++){
     _temp[i] = drift(ion[i], driftDir, mt, tn);
   }
   return _temp;
 }

SignalPoint SiLinearChargeCollectionDrifter::drift	(	const EnergyDepositUnit &	edu,
		const LocalVector &	drift,
		double	moduleThickness,
		double	timeNormalisation
	)

private

Definition at line 29 of file SiLinearChargeCollectionDrifter.cc.

References appliedVoltage, chargeDistributionRMS, depletionVoltage, particleFlowClusterECALTimeSelected_cfi::depth, diffusionConstant, EnergyDepositUnit::energy(), mathSSE::sqrt(), EnergyDepositUnit::x(), PV3DBase< T, PVType, FrameType >::x(), EnergyDepositUnit::y(), PV3DBase< T, PVType, FrameType >::y(), EnergyDepositUnit::z(), and PV3DBase< T, PVType, FrameType >::z().

                                                                                                            {
   // computes the fraction of the module the charge has to drift through,
   // ensuring it is bounded in [0,1]
   double depth = (moduleThickness/2.-edu.z());
   double thicknessFraction = depth/moduleThickness ; 
   thicknessFraction = thicknessFraction>0. ? thicknessFraction : 0. ;
   thicknessFraction = thicknessFraction<1. ? thicknessFraction : 1. ;
   
   // computes the drift time in the sensor
   double driftTime = -timeNormalisation*
     vdt::fast_log(1.-2*depletionVoltage*thicknessFraction/
     (depletionVoltage+appliedVoltage))
     +chargeDistributionRMS;  
   
   // returns the signal: an energy on the surface, with a size due to diffusion.
   return SignalPoint(edu.x() + depth*drift.x()/drift.z(),
                      edu.y() + depth*drift.y()/drift.z(),
                      sqrt(2.*diffusionConstant*driftTime),
                      edu.energy());
 }