RPLinearChargeDivider Class Reference

#include <RPLinearChargeDivider.h>

Public Member Functions
simromanpot::energy_path_distribution	divide (const PSimHit &hit)
	RPLinearChargeDivider (const edm::ParameterSet &params, CLHEP::HepRandomEngine &eng, RPDetId det_id)
	~RPLinearChargeDivider ()

Private Member Functions
void	FluctuateEloss (int pid, double particleMomentum, double eloss, double length, int NumberOfSegs, simromanpot::energy_path_distribution &elossVector)

Private Attributes
int	chargedivisionsPerStrip_
int	chargedivisionsPerThickness_
double	deltaCut_
RPDetId	det_id_
std::unique_ptr< SiG4UniversalFluctuation >	fluctuate_
bool	fluctuateCharge_
double	pitch_
CLHEP::HepRandomEngine &	rndEngine_
simromanpot::energy_path_distribution	the_energy_path_distribution_
double	thickness_
int	verbosity_

Detailed Description

Definition at line 13 of file RPLinearChargeDivider.h.

Constructor & Destructor Documentation

RPLinearChargeDivider()

RPLinearChargeDivider::RPLinearChargeDivider	(	const edm::ParameterSet &	params,
		CLHEP::HepRandomEngine &	eng,
		RPDetId	det_id
	)

Definition at line 7 of file RPLinearChargeDivider.cc.

References chargedivisionsPerStrip_, chargedivisionsPerThickness_, deltaCut_, fluctuate_, fluctuateCharge_, submitPVValidationJobs::params, pitch_, thickness_, and verbosity_.

    : rndEngine_(eng), det_id_(det_id) {
  verbosity_ = params.getParameter<int>("RPVerbosity");

  fluctuate_ = std::make_unique<SiG4UniversalFluctuation>();

  // To Run APV in peak instead of deconvolution mode, which degrades the time resolution.
  //use: SimpleConfigurable<bool> SiLinearChargeDivider::peakMode(false,"SiStripDigitizer:APVpeakmode");

  // To Enable interstrip Landau fluctuations within a cluster.
  //use: SimpleConfigurable<bool> SiLinearChargeDivider::fluctuateCharge(true,"SiStripDigitizer:LandauFluctuations");
  fluctuateCharge_ = params.getParameter<bool>("RPLandauFluctuations");

  // Number of segments per strip into which charge is divided during
  // simulation. If large, precision of simulation improves.
  //to do so: SimpleConfigurable<int> SiLinearChargeDivider::chargeDivisionsPerStrip(10,"SiStripDigitizer:chargeDivisionsPerStrip");
  chargedivisionsPerStrip_ = params.getParameter<int>("RPChargeDivisionsPerStrip");
  chargedivisionsPerThickness_ = params.getParameter<int>("RPChargeDivisionsPerThickness");

  // delta cutoff in MeV, has to be same as in OSCAR (0.120425 MeV corresponding // to 100um range for electrons)
  //        SimpleConfigurable<double>  SiLinearChargeDivider::deltaCut(0.120425,
  deltaCut_ = params.getParameter<double>("RPDeltaProductionCut");

  RPTopology rp_det_topol;
  pitch_ = rp_det_topol.DetPitch();
  thickness_ = rp_det_topol.DetThickness();
}

~RPLinearChargeDivider()

RPLinearChargeDivider::~RPLinearChargeDivider

(

)

Definition at line 37 of file RPLinearChargeDivider.cc.

{}

Member Function Documentation

divide()

simromanpot::energy_path_distribution RPLinearChargeDivider::divide

(

const PSimHit &

hit

)

Definition at line 39 of file RPLinearChargeDivider.cc.

References chargedivisionsPerStrip_, chargedivisionsPerThickness_, det_id_, simKBmtfDigis_cfi::eLoss, fluctuateCharge_, FluctuateEloss(), mps_fire::i, createfilelist::int, PV3DBase< T, PVType, FrameType >::mag(), SiStripPI::max, pitch_, the_energy_path_distribution_, thickness_, verbosity_, PV3DBase< T, PVType, FrameType >::x(), PV3DBase< T, PVType, FrameType >::y(), and PV3DBase< T, PVType, FrameType >::z().

                                                                                    {
  LocalVector direction = hit.exitPoint() - hit.entryPoint();
  if (direction.z() > 10 || direction.x() > 200 || direction.y() > 200) {
    the_energy_path_distribution_.clear();
    return the_energy_path_distribution_;
  }

  int NumberOfSegmentation_y = (int)(1 + chargedivisionsPerStrip_ * fabs(direction.y()) / pitch_);
  int NumberOfSegmentation_z = (int)(1 + chargedivisionsPerThickness_ * fabs(direction.z()) / thickness_);
  int NumberOfSegmentation = std::max(NumberOfSegmentation_y, NumberOfSegmentation_z);

  double eLoss = hit.energyLoss();  // Eloss in GeV

  the_energy_path_distribution_.resize(NumberOfSegmentation);

  if (fluctuateCharge_) {
    int pid = hit.particleType();
    double momentum = hit.pabs();
    double length = direction.mag();  // Track length in Silicon
    FluctuateEloss(pid, momentum, eLoss, length, NumberOfSegmentation, the_energy_path_distribution_);
    for (int i = 0; i < NumberOfSegmentation; i++) {
      the_energy_path_distribution_[i].setPosition(hit.entryPoint() +
                                                   double((i + 0.5) / NumberOfSegmentation) * direction);
    }
  } else {
    for (int i = 0; i < NumberOfSegmentation; i++) {
      the_energy_path_distribution_[i].setPosition(hit.entryPoint() +
                                                   double((i + 0.5) / NumberOfSegmentation) * direction);
      the_energy_path_distribution_[i].setEnergy(eLoss / (double)NumberOfSegmentation);
    }
  }

  if (verbosity_) {
    edm::LogInfo("RPLinearChargeDivider") << det_id_ << " charge along the track:\n";
    double sum = 0;
    for (unsigned int i = 0; i < the_energy_path_distribution_.size(); i++) {
      edm::LogInfo("RPLinearChargeDivider")
          << the_energy_path_distribution_[i].Position().x() << " " << the_energy_path_distribution_[i].Position().y()
          << " " << the_energy_path_distribution_[i].Position().z() << " " << the_energy_path_distribution_[i].Energy()
          << "\n";
      sum += the_energy_path_distribution_[i].Energy();
    }
    edm::LogInfo("RPLinearChargeDivider") << "energy dep. sum=" << sum << "\n";
  }

  return the_energy_path_distribution_;
}

FluctuateEloss()

void RPLinearChargeDivider::FluctuateEloss ( int  pid, double  particleMomentum, double  eloss, double  length, int  NumberOfSegs, simromanpot::energy_path_distribution &  elossVector  )

private

Definition at line 87 of file RPLinearChargeDivider.cc.

References funct::abs(), deltaCut_, EcalCondDBWriter_cfi::Energy, fluctuate_, mps_fire::i, cuy::ii, particleFlowDisplacedVertex_cfi::ratio, and rndEngine_.

Referenced by divide().

                                                                                             {
  double particleMass = 139.6;  // Mass in MeV, Assume pion
  pid = std::abs(pid);
  if (pid != 211) {  // Mass in MeV
    if (pid == 11)
      particleMass = 0.511;
    else if (pid == 13)
      particleMass = 105.7;
    else if (pid == 321)
      particleMass = 493.7;
    else if (pid == 2212)
      particleMass = 938.3;
  }

  double segmentLength = length / NumberOfSegs;

  // Generate charge fluctuations.
  double de = 0.;
  double sum = 0.;
  double segmentEloss = (eloss * 1000) / NumberOfSegs;  //eloss in MeV
  for (int i = 0; i < NumberOfSegs; i++) {
    // The G4 routine needs momentum in MeV, mass in Mev, delta-cut in MeV,
    // track segment length in mm, segment eloss in MeV
    // Returns fluctuated eloss in MeV
    double deltaCutoff = deltaCut_;
    de = fluctuate_->SampleFluctuations(
             particleMomentum * 1000, particleMass, deltaCutoff, segmentLength, segmentEloss, &(rndEngine_)) /
         1000;  //convert to GeV
    elossVector[i].setEnergy(de);
    sum += de;
  }

  if (sum > 0.) {  // If fluctuations give eloss>0.
    // Rescale to the same total eloss
    double ratio = eloss / sum;
    for (int ii = 0; ii < NumberOfSegs; ii++)
      elossVector[ii].setEnergy(ratio * elossVector[ii].Energy());
  } else {  // If fluctuations gives 0 eloss
    double averageEloss = eloss / NumberOfSegs;
    for (int ii = 0; ii < NumberOfSegs; ii++)
      elossVector[ii].setEnergy(averageEloss);
  }
  return;
}

Member Data Documentation

chargedivisionsPerStrip_

int RPLinearChargeDivider::chargedivisionsPerStrip_

private

Definition at line 24 of file RPLinearChargeDivider.h.

Referenced by divide(), and RPLinearChargeDivider().

chargedivisionsPerThickness_

int RPLinearChargeDivider::chargedivisionsPerThickness_

private

Definition at line 25 of file RPLinearChargeDivider.h.

Referenced by divide(), and RPLinearChargeDivider().

deltaCut_

double RPLinearChargeDivider::deltaCut_

private

Definition at line 26 of file RPLinearChargeDivider.h.

Referenced by FluctuateEloss(), and RPLinearChargeDivider().

det_id_

RPDetId RPLinearChargeDivider::det_id_

private

Definition at line 21 of file RPLinearChargeDivider.h.

Referenced by divide().

fluctuate_

std::unique_ptr<SiG4UniversalFluctuation> RPLinearChargeDivider::fluctuate_

private

Definition at line 30 of file RPLinearChargeDivider.h.

Referenced by FluctuateEloss(), and RPLinearChargeDivider().

fluctuateCharge_

bool RPLinearChargeDivider::fluctuateCharge_

private

Definition at line 23 of file RPLinearChargeDivider.h.

Referenced by divide(), and RPLinearChargeDivider().

pitch_

double RPLinearChargeDivider::pitch_

private

Definition at line 27 of file RPLinearChargeDivider.h.

Referenced by divide(), and RPLinearChargeDivider().

rndEngine_

CLHEP::HepRandomEngine& RPLinearChargeDivider::rndEngine_

private

Definition at line 20 of file RPLinearChargeDivider.h.

Referenced by FluctuateEloss().

the_energy_path_distribution_

simromanpot::energy_path_distribution RPLinearChargeDivider::the_energy_path_distribution_

private

Definition at line 29 of file RPLinearChargeDivider.h.

Referenced by divide().

thickness_

double RPLinearChargeDivider::thickness_

private

Definition at line 28 of file RPLinearChargeDivider.h.

Referenced by divide(), and RPLinearChargeDivider().

verbosity_

int RPLinearChargeDivider::verbosity_

private

Definition at line 31 of file RPLinearChargeDivider.h.

Referenced by divide(), and RPLinearChargeDivider().