SiLinearChargeCollectionDrifter Class Reference

#include <SiLinearChargeCollectionDrifter.h>

Inheritance diagram for SiLinearChargeCollectionDrifter:

List of all members.

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

---

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 3 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 15 of file SiLinearChargeCollectionDrifter.cc.

References linker::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 28 of file SiLinearChargeCollectionDrifter.cc.

References EnergyDepositUnit::energy(), 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*
    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

const double SiLinearChargeCollectionDrifter::appliedVoltage [private]

Definition at line 23 of file SiLinearChargeCollectionDrifter.h.

const double SiLinearChargeCollectionDrifter::chargeDistributionRMS [private]

Definition at line 21 of file SiLinearChargeCollectionDrifter.h.

const double SiLinearChargeCollectionDrifter::depletionVoltage [private]

Definition at line 22 of file SiLinearChargeCollectionDrifter.h.

const double SiLinearChargeCollectionDrifter::diffusionConstant [private]

Definition at line 20 of file SiLinearChargeCollectionDrifter.h.