SiLinearChargeCollectionDrifter Class Reference

#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]

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.

References mps_fire::i, and TtSemiLepEvtBuilder_cfi::mt.

Referenced by drift().

                                                                                                            {
  // 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;
}

drift() [2/2]

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

private

Definition at line 23 of file SiLinearChargeCollectionDrifter.cc.

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

Member Data Documentation

appliedVoltage

const double SiLinearChargeCollectionDrifter::appliedVoltage

private

Definition at line 27 of file SiLinearChargeCollectionDrifter.h.

Referenced by drift().

chargeDistributionRMS

const double SiLinearChargeCollectionDrifter::chargeDistributionRMS

private

Definition at line 25 of file SiLinearChargeCollectionDrifter.h.

Referenced by drift().

depletionVoltage

const double SiLinearChargeCollectionDrifter::depletionVoltage

private

Definition at line 26 of file SiLinearChargeCollectionDrifter.h.

Referenced by drift().

diffusionConstant

const double SiLinearChargeCollectionDrifter::diffusionConstant

private

Definition at line 24 of file SiLinearChargeCollectionDrifter.h.

Referenced by drift().