#include <PndSdsCalcPixelDif.h>

Public Member Functions
	PndSdsCalcPixelDif ()
	Default constructor. More...

	PndSdsCalcPixelDif (Double_t w, Double_t l, Double_t qspread=0, Double_t threshold=0, Double_t noise=0, Double_t nrows=10, Double_t ncols=10)

	PndSdsCalcPixelDif (const PndSdsPixelDigiPar &digi_par)

std::vector< PndSdsPixel >	GetPixels (Double_t inx, Double_t iny, Double_t outx, Double_t outy, Double_t energy)
	Main function to calculate the vector<PndSdsPixel> of fired pixel. More...

Int_t	GetPixelsAlternative (Double_t inx, Double_t iny, Double_t outx, Double_t outy, Double_t energy, std::vector< Int_t > &cols, std::vector< Int_t > &rows, std::vector< Double_t > &charges)

void	SetVerboseLevel (Int_t level)

std::ostream &	operator<< (std::ostream &out)

Private Member Functions
Double_t	ChargeFromEloss (Double_t eloss) const

void	InjectPixelCharge (Int_t col, Int_t row, Double_t charge)

Private Attributes
std::vector< PndSdsPixel >	fPixels

PndSdsPixel	fActivePixel

Double_t	fPixelSizeX

Double_t	fPixelSizeY

Double_t	fRows

Double_t	fCols

Double_t	fThreshold

Double_t	fNoise

Double_t	fQspread

Double_t	fEnergy

Int_t	fVerboseLevel

Detailed Description

Definition at line 27 of file PndSdsCalcPixelDif.h.

Constructor & Destructor Documentation

PndSdsCalcPixelDif::PndSdsCalcPixelDif ( )

Default constructor.

Definition at line 8 of file PndSdsCalcPixelDif.cxx.

                                        :
                 fPixels(), fActivePixel(), fPixelSizeX(0.), fPixelSizeY(0.), fRows(0.), fCols(0.), fThreshold(0.), fNoise(
                     0.), fQspread(0.), fEnergy(0.), fVerboseLevel(0) {
 }

PndSdsCalcPixelDif::PndSdsCalcPixelDif	(	Double_t	w,
		Double_t	l,
		Double_t	qspread = `0`,
		Double_t	threshold = `0`,
		Double_t	noise = `0`,
		Double_t	nrows = `10`,
		Double_t	ncols = `10`
	)

Main constructor

Parameters

w	width of sensor pixel [cm]
l	length of sensor pixel [cm]
qspread	charge cloud gaussian width
threshold	discriminator threshold of pixel [e]
noise	total noise of pixel [e]

Definition at line 20 of file PndSdsCalcPixelDif.cxx.

                                                                                                                                                     :
     fPixels(),
     fActivePixel(),
                 fPixelSizeX(lx),
                 fPixelSizeY(ly),
     fRows(nrows),
     fCols(ncols),
                 fThreshold(threshold),
                 fNoise(noise),
     fQspread(qspread),
                 fEnergy(0.),
     fVerboseLevel(0)
 {}

PndSdsCalcPixelDif::PndSdsCalcPixelDif ( const PndSdsPixelDigiPar & digi_par )

Definition at line 13 of file PndSdsCalcPixelDif.cxx.

                                                                          :
                 fPixels(), fActivePixel(), fPixelSizeX(digi_par.GetXPitch()), fPixelSizeY(digi_par.GetYPitch()), fRows(
                     digi_par.GetFERows() * digi_par.GetMaxFEperRow()), fCols(
                     digi_par.GetFECols() * digi_par.GetMaxFEperCol()), fThreshold(digi_par.GetThreshold()), fNoise(
                     digi_par.GetNoise()), fQspread(digi_par.GetQCloudSigma()), fEnergy(0.), fVerboseLevel(0) {
 }

Member Function Documentation

Double_t PndSdsCalcPixelDif::ChargeFromEloss ( Double_t eloss ) const

inlineprivate

Definition at line 56 of file PndSdsCalcPixelDif.h.

Referenced by GetPixels().

56 {return eloss/(3.61e-9);}

eloss

double eloss

Definition: anaLmdSim.C:34

std::vector< PndSdsPixel > PndSdsCalcPixelDif::GetPixels	(	Double_t	inx,
		Double_t	iny,
		Double_t	outx,
		Double_t	outy,
		Double_t	energy
	)

Main function to calculate the vector<PndSdsPixel> of fired pixel.

Definition at line 50 of file PndSdsCalcPixelDif.cxx.

References ChargeFromEloss(), col, cols, fabs(), fPixels, fPixelSizeX, fPixelSizeY, fQspread, i, InjectPixelCharge(), row, and t.

Referenced by PndSdsHybridHitProducer::Exec(), and GetPixelsAlternative().

                                 {
         fPixels.clear();
         if (0 >= fPixelSizeX || 0 >= fPixelSizeY) {
                 Error("PndSdsCalcPixelDif::GetPixels()", "Invalid Pixel sizes: fPixelSizeX=%g,fPixelSizeY=%g",
                     fPixelSizeX, fPixelSizeY);
                 return fPixels;
         }
 
         // determine box digis which can get charge
         double max_charge_diffusion_distance(3.0 * fQspread);
         double min_x(inx);
         double max_x(outx);
         if (outx < inx) {
                 min_x = outx;
                 max_x = inx;
         }
         double min_y(iny);
         double max_y(outy);
         if (outy < iny) {
                 min_y = outy;
                 max_y = iny;
         }
         min_x -= max_charge_diffusion_distance;
         min_y -= max_charge_diffusion_distance;
         max_x += max_charge_diffusion_distance;
         max_y += max_charge_diffusion_distance;
 
         double track_dx = outx - inx;
         double track_dy = outy - iny;
         unsigned int cols(
             ((unsigned int) std::fabs(max_x / fPixelSizeX)) - ((unsigned int) std::fabs(min_x / fPixelSizeX))
                 + 1);
         unsigned int rows(
             ((unsigned int) std::fabs(max_y / fPixelSizeY)) - ((unsigned int) std::fabs(min_y / fPixelSizeY))
                 + 1);
         // we gain a lot of speed by using a fixed vector
         // and using a fixed mapping between row+col and vector index
         int start_col(min_x / fPixelSizeX);
         int start_row(min_y / fPixelSizeY);
         double difx = 0, dify = 0;
         int row = 0, col = 0;
         double t = 0;
         std::vector<int> hitstorage(cols * rows, 0);
         double Q = ChargeFromEloss(dE);  // in electrons
         unsigned int samples(Q);  // sample amount (can be chosen independent of charge electrons Q)
         // do hit&miss mc sampling, if we have more than 1 possible cell
         if (hitstorage.size() == 1) {
                 InjectPixelCharge(start_col, start_row, Q);
         }
         else {
                 for (unsigned int i = 0; i < samples; ++i) {
                         t = gRandom->Rndm();
                         difx = gRandom->Gaus(0, fQspread);
                         dify = gRandom->Gaus(0, fQspread);
                         // if the electron diffused outside of the boundary just ignore it
                         if (std::abs(difx) > max_charge_diffusion_distance
                             || std::abs(dify) > max_charge_diffusion_distance) continue;
                         col = (inx + t * track_dx + difx) / fPixelSizeX;
                         row = (iny + t * track_dy + dify) / fPixelSizeY;
                         hitstorage[(row - start_row) * cols + (col - start_col)]++;
                 }
                 // distribute electrons based on the distribution from the hit&miss
                 for (unsigned int i = 0; i < hitstorage.size(); ++i) {
                         if (hitstorage[i] > 0) {
                                 row = i / cols + start_row;
                                 col = i % cols + start_col;
                                 InjectPixelCharge(col, row, Q * hitstorage[i] / samples);
                         }
                 }
         }
         return fPixels;
 }

Int_t PndSdsCalcPixelDif::GetPixelsAlternative	(	Double_t	inx,
		Double_t	iny,
		Double_t	outx,
		Double_t	outy,
		Double_t	energy,
		std::vector< Int_t > &	cols,
		std::vector< Int_t > &	rows,
		std::vector< Double_t > &	charges
	)

Definition at line 34 of file PndSdsCalcPixelDif.cxx.

References fVerboseLevel, GetPixels(), and i.

                                   {
         std::vector<PndSdsPixel> pixels = GetPixels(inx, iny, outx, outy, energy);
         Int_t npix = pixels.size();
         for (Int_t i = 0; i < npix; i++) {
                 if (fVerboseLevel > 2) Info("PndSdsCalcPixelDif::GetPixelsAlternative()",
                     "pass this pixel: i=%i, c=%i, r=%i, q=%f", i, pixels[i].GetCol(), pixels[i].GetRow(),
                     pixels[i].GetCharge());
                 cols.push_back(pixels[i].GetCol());
                 rows.push_back(pixels[i].GetRow());
                 charges.push_back(pixels[i].GetCharge());
         }
         return npix;
 }

void PndSdsCalcPixelDif::InjectPixelCharge	(	Int_t	col,
		Int_t	row,
		Double_t	charge
	)

private

Definition at line 125 of file PndSdsCalcPixelDif.cxx.

References Double_t, fActivePixel, fCols, fNoise, fPixels, fRows, fThreshold, fVerboseLevel, PndSdsPixel::SetCharge(), PndSdsPixel::SetCol(), and PndSdsPixel::SetRow().

Referenced by GetPixels().

                                                                                 {
         // cut if out of range
         if (col < 0 || row < 0 || col > fCols || row > fRows) {
                 if (fVerboseLevel > 2) {
                         std::stringstream ss;
                         ss << " (col=" << col << ",row=" << row << " values exceed sensor boundaries: cols=[0-" << fCols
                             << "] rows=[0-" << fRows << "]";
                         Info("PndSdsCalcPixelDif::PndSdsCalcPixelDif::InjectPixelCharge:", ss.str().c_str());
                 }
         }
         Double_t smearedCharge = gRandom->Gaus(charge, fNoise);
         if (fVerboseLevel > 3) std::cout << " charge = " << charge << ", smeared = " << smearedCharge
             << std::endl;
         if (smearedCharge > fThreshold) {
                 if (fVerboseLevel > 3) Info("PndSdsCalcPixelDif::InjectPixelCharge", "col=%i, row=%i,charge=%f", col,
                     row, charge);
                 fActivePixel.SetCol(col);  // x axis
                 fActivePixel.SetRow(row);  // y axis
                 fActivePixel.SetCharge(smearedCharge);
                 fPixels.push_back(fActivePixel);  // fActivePixel content will be copied
         }
         return;
 }

std::ostream & PndSdsCalcPixelDif::operator<< ( std::ostream & out )

Definition at line 150 of file PndSdsCalcPixelDif.cxx.

References fPixelSizeX, fPixelSizeY, and out.

                                                           {
         out << "fPixelSizeX: " << fPixelSizeX << " fPixelSizeY: " << fPixelSizeY << std::endl;
 
         return out;
 }