#include <SiLinearChargeCollectionDrifter.h>

Inheritance diagram for SiLinearChargeCollectionDrifter:

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

	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::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

◆ drift() [1/2]

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

private

Definition at line 23 of file SiLinearChargeCollectionDrifter.cc.

                                                                              {
   // 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());
 }

References appliedVoltage, chargeDistributionRMS, depletionVoltage, LEDCalibrationChannels::depth, diffusionConstant, drift(), EnergyDepositUnit::energy(), mathSSE::sqrt(), EnergyDepositUnit::x(), EnergyDepositUnit::y(), and EnergyDepositUnit::z().

◆ drift() [2/2]

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

overridevirtual

Implements SiChargeCollectionDrifter.

Definition at line 11 of file SiLinearChargeCollectionDrifter.cc.

                                                                                                             {
   // 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;
 }