/data/refman/pasoursint/CMSSW_4_1_8_patch9/src/SimCalorimetry/HcalSimAlgos/src/HcalAmplifier.cc

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#include "SimCalorimetry/HcalSimAlgos/interface/HcalAmplifier.h"
#include "SimCalorimetry/HcalSimAlgos/interface/HcalSimParameters.h"
#include "SimCalorimetry/HcalSimAlgos/interface/HPDIonFeedbackSim.h"
#include "SimCalorimetry/CaloSimAlgos/interface/CaloVSimParameterMap.h"
#include "SimCalorimetry/CaloSimAlgos/interface/CaloVNoiseSignalGenerator.h"
#include "CalibFormats/HcalObjects/interface/HcalDbService.h"
#include "CondFormats/HcalObjects/interface/HcalPedestal.h"
#include "CondFormats/HcalObjects/interface/HcalGain.h"
#include "CondFormats/HcalObjects/interface/HcalPedestalWidth.h"
#include "CondFormats/HcalObjects/interface/HcalGainWidth.h"
#include "CalibFormats/CaloObjects/interface/CaloSamples.h"
#include "DataFormats/HcalDetId/interface/HcalDetId.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"

#include "CalibFormats/HcalObjects/interface/HcalCalibrations.h"

#include<iostream>
#include <cmath>
#include <math.h>

HcalAmplifier::HcalAmplifier(const CaloVSimParameterMap * parameters, bool addNoise) :
  theDbService(0), 
  theRandGaussQ(0),
  theRandFlat(0),
  theParameterMap(parameters),
  theNoiseSignalGenerator(0),
  theIonFeedbackSim(0),
  theStartingCapId(0), 
  addNoise_(addNoise),
  useOldHB(false),
  useOldHE(false),
  useOldHF(false),
  useOldHO(false)
{
}


void HcalAmplifier::setDbService(const HcalDbService * service) {
  theDbService = service;
  if(theIonFeedbackSim) theIonFeedbackSim->setDbService(service);
}


void HcalAmplifier::setRandomEngine(CLHEP::HepRandomEngine & engine)
{
  theRandGaussQ = new CLHEP::RandGaussQ(engine);
  theRandFlat = new CLHEP::RandFlat(engine);
  if(theIonFeedbackSim) theIonFeedbackSim->setRandomEngine(engine);
}


void HcalAmplifier::amplify(CaloSamples & frame) const {
  if(theIonFeedbackSim)
  {
    theIonFeedbackSim->addThermalNoise(frame);
  }
  pe2fC(frame);
  if(theNoiseSignalGenerator==0 || !theNoiseSignalGenerator->contains(frame.id()))
  {
    addPedestals(frame);
  }
  LogDebug("HcalAmplifier") << frame;
}


void HcalAmplifier::pe2fC(CaloSamples & frame) const
{
  const CaloSimParameters & parameters = theParameterMap->simParameters(frame.id());
  frame *= parameters.photoelectronsToAnalog(frame.id());
}

void HcalAmplifier::setHBtuningParameter(double tp) { HB_ff = tp; }
void HcalAmplifier::setHEtuningParameter(double tp) { HE_ff = tp; }
void HcalAmplifier::setHFtuningParameter(double tp) { HF_ff = tp; }
void HcalAmplifier::setHOtuningParameter(double tp) { HO_ff = tp; }
void HcalAmplifier::setUseOldHB(bool useOld) { useOldHB = useOld; }
void HcalAmplifier::setUseOldHE(bool useOld) { useOldHE = useOld; }
void HcalAmplifier::setUseOldHF(bool useOld) { useOldHF = useOld; }
void HcalAmplifier::setUseOldHO(bool useOld) { useOldHO = useOld; }

void HcalAmplifier::addPedestals(CaloSamples & frame) const
{
   assert(theDbService != 0);
   HcalGenericDetId hcalGenDetId(frame.id());
   HcalGenericDetId::HcalGenericSubdetector hcalSubDet = hcalGenDetId.genericSubdet();

   bool useOld=false;
   if(hcalSubDet==HcalGenericDetId::HcalGenBarrel) useOld = useOldHB;
   if(hcalSubDet==HcalGenericDetId::HcalGenEndcap) useOld = useOldHE;
   if(hcalSubDet==HcalGenericDetId::HcalGenForward) useOld = useOldHF;
   if(hcalSubDet==HcalGenericDetId::HcalGenOuter) useOld = useOldHO;
   
   if(useOld)
   {
     const HcalCalibrationWidths & calibWidths =
       theDbService->getHcalCalibrationWidths(hcalGenDetId);
     const HcalCalibrations& calibs = theDbService->getHcalCalibrations(hcalGenDetId);
   
     double noise [32] = {0.}; //big enough
     if(addNoise_)
     {
       double gauss [32]; //big enough
       for (int i = 0; i < frame.size(); i++) gauss[i] = theRandGaussQ->fire(0., 1.);
       makeNoiseOld(hcalSubDet, calibWidths, frame.size(), gauss, noise);
     }
   
     for (int tbin = 0; tbin < frame.size(); ++tbin) {
       int capId = (theStartingCapId + tbin)%4;
       double pedestal = calibs.pedestal(capId) + noise[tbin];
       frame[tbin] += pedestal;
     }
     return;
   }


  double fudgefactor = 1;
  if(hcalSubDet==HcalGenericDetId::HcalGenBarrel) fudgefactor = HB_ff;
  if(hcalSubDet==HcalGenericDetId::HcalGenEndcap) fudgefactor = HE_ff;
  if(hcalSubDet==HcalGenericDetId::HcalGenForward) fudgefactor = HF_ff;
  if(hcalSubDet==HcalGenericDetId::HcalGenOuter) fudgefactor = HO_ff;
  if(hcalGenDetId.isHcalCastorDetId()) return;
  if(hcalGenDetId.isHcalZDCDetId()) return;

  const HcalCholeskyMatrix * thisChanCholesky = myCholeskys->getValues(hcalGenDetId);
  const HcalPedestal * thisChanADCPeds = myADCPeds->getValues(hcalGenDetId);
  int theStartingCapId_2 = (int)floor(theRandFlat->fire(0.,4.));

  double noise [32] = {0.}; //big enough
  if(addNoise_)
  {
    double gauss [32]; //big enough
    for (int i = 0; i < frame.size(); i++) gauss[i] = theRandGaussQ->fire(0., 1.);
    makeNoise(*thisChanCholesky, frame.size(), gauss, noise, (int)theStartingCapId_2);
  }

  const HcalQIECoder* coder = theDbService->getHcalCoder(hcalGenDetId);
  const HcalQIEShape* shape = theDbService->getHcalShape();

  for (int tbin = 0; tbin < frame.size(); ++tbin) {
    int capId = (theStartingCapId_2 + tbin)%4;
    double x = noise[tbin] * fudgefactor + thisChanADCPeds->getValue(capId);//*(values+capId); //*.70 goes here!
    int x1=(int)std::floor(x);
    int x2=(int)std::floor(x+1);
    float y2=coder->charge(*shape,x2,capId);
    float y1=coder->charge(*shape,x1,capId);
    frame[tbin] = (y2-y1)*(x-x1)+y1;
  }
}

void HcalAmplifier::makeNoise (const HcalCholeskyMatrix & thisChanCholesky, int fFrames, double* fGauss, double* fNoise, int m) const {
   if(fFrames > 10) return;

   for(int i = 0; i != 10; i++){
      for(int j = 0; j != 10; j++){ //fNoise is initialized to zero in function above! Must be zero before this step
         fNoise[i] += thisChanCholesky.getValue(m,i,j) * fGauss[j];
      }
   }
}

void HcalAmplifier::makeNoiseOld (HcalGenericDetId::HcalGenericSubdetector hcalSubDet, const HcalCalibrationWidths& width, int fFrames, double* fGauss, double* fNoise) const 
{
  // This is a simplified noise generation scheme using only the diagonal elements
  // (proposed by Salavat Abduline).
  // This is direct adaptation of the code in HcalPedestalWidth.cc
  
  // average over capId's
  double s_xx_mean =  0.25 * (width.pedestal(0)*width.pedestal(0) + 
                              width.pedestal(1)*width.pedestal(1) + 
                              width.pedestal(2)*width.pedestal(2) + 
                              width.pedestal(3)*width.pedestal(3));


  // Off-diagonal element approximation
  // In principle should come from averaging the values of elements (0.1), (1,2), (2,3), (3,0)
  // For now use the definition below (but keep structure of the code structure for development) 
  double s_xy_mean = -0.5 * s_xx_mean;
  // Use different parameter for HF to reproduce the noise rate after zero suppression.
  // Steven Won/Jim Hirschauer/Radek Ofierzynski 18.03.2010
  if (hcalSubDet == HcalGenericDetId::HcalGenForward) s_xy_mean = 0.08 * s_xx_mean;

  double term  = s_xx_mean*s_xx_mean - 2.*s_xy_mean*s_xy_mean;

  if (term < 0.) term = 1.e-50 ;
  double sigma = sqrt (0.5 * (s_xx_mean + sqrt(term)));
  double corr = sigma == 0. ? 0. : 0.5*s_xy_mean / sigma;

  for (int i = 0; i < fFrames; i++) {
    fNoise [i] = fGauss[i]*sigma;
    if (i > 0) fNoise [i] += fGauss[i-1]*corr;
    if (i < fFrames-1) fNoise [i] += fGauss[i+1]*corr;
  }
}