#include <CSCMake2DRecHit.h>

Public Member Functions
	CSCMake2DRecHit (const edm::ParameterSet &)
float	findWireBx (std::vector< int > timeBinsOn, float tpeak, const CSCDetId &id)
CSCRecHit2D	hitFromStripAndWire (const CSCDetId &id, const CSCLayer *layer, const CSCWireHit &wHit, const CSCStripHit &sHit)
	Make 2D hits when have both wire and strip hit available in same layer.
bool	isHitInFiducial (const CSCLayer *layer, const CSCRecHit2D &rh)
	Test if rechit is in fiducial volume.
void	setConditions (const CSCRecoConditions *reco)
	Pass pointer to conditions data onwards.
	~CSCMake2DRecHit ()
Public Attributes
CSCDetId	id_
const CSCLayer *	layer_
const CSCLayerGeometry *	layergeom_
const CSCChamberSpecs *	specs_
Private Attributes
float	maxGattiChi2
const std::auto_ptr < CSCFindPeakTime >	peakTimeFinder_
const CSCRecoConditions *	recoConditions_
int	stripWireDeltaTime
bool	useCalib
bool	useGasGainCorrections
bool	useGatti
bool	useTimingCorrections
CSCXonStrip_MatchGatti *	xMatchGatti_

Detailed Description

The overlap between strip hits and wire hits is used to determined 2D RecHit. For layers where only strip or wire hits are present, pseudo 2D hits are formed.

Author:: : Dominique Fortin - UCR

Definition at line 30 of file CSCMake2DRecHit.h.

Constructor & Destructor Documentation

CSCMake2DRecHit::CSCMake2DRecHit ( const edm::ParameterSet & ps ) [explicit]

Definition at line 25 of file CSCMake2DRecHit.cc.

References edm::ParameterSet::getParameter(), stripWireDeltaTime, useCalib, useGasGainCorrections, useTimingCorrections, and xMatchGatti_.

                                                         :
  peakTimeFinder_( new CSCFindPeakTime( ps ) ){
    
  useCalib            = ps.getParameter<bool>("CSCUseCalibrations");
  stripWireDeltaTime  = ps.getParameter<int>("CSCstripWireDeltaTime"); //@@ Non-standard  CSC*s*trip...
  useTimingCorrections= ps.getParameter<bool>("CSCUseTimingCorrections");
  useGasGainCorrections = ps.getParameter<bool>("CSCUseGasGainCorrections");

  xMatchGatti_        = new CSCXonStrip_MatchGatti( ps );

}

CSCMake2DRecHit::~CSCMake2DRecHit ( )

Definition at line 38 of file CSCMake2DRecHit.cc.

References xMatchGatti_.

                                  {
  delete xMatchGatti_;
}

Member Function Documentation

float CSCMake2DRecHit::findWireBx	(	std::vector< int >	timeBinsOn,
		float	tpeak,
		const CSCDetId &	id
	)

Definition at line 299 of file CSCMake2DRecHit.cc.

References CSCRecoConditions::anodeBXoffset(), diffTreeTool::diff, j, and recoConditions_.

Referenced by hitFromStripAndWire().

                                                                                             {
  // Determine the wire Bx from the vector of time bins on for the wire digi with peak time as an intial estimate.
  // Assumes that a single hit should create either one time bin on or two consecutive time bins on
  // so algorithm looks for bin on nearest to peak time and checks if it has a bin on consecutive with it
  float anode_bx_offset = recoConditions_->anodeBXoffset(id);
  float wireBx=-1;
  float timeGuess=tpeak/25.+ anode_bx_offset;  
  float diffMin=9999.;
  int bestMatch=-9;
  for (int j=0; j<(int)timeBinsOn.size(); j++) {
    double diff=timeGuess-timeBinsOn[j];
    // Find bin on closest to peak time
    if (fabs(diff)<fabs(diffMin)) {
      diffMin=diff;
      bestMatch=j;
      wireBx=timeBinsOn[j];
    }
  }
  int side=diffMin/fabs(diffMin);
  bool unchanged=true;
  // First check if bin on the same side as peak time is on
  if ((bestMatch+side)>-1 && (bestMatch+side)<(int)timeBinsOn.size()) {      // Make sure one next to it within vector limits
    if (timeBinsOn[bestMatch]==(timeBinsOn[bestMatch+side]-side)) {      // See if next bin on in vector is consecutive in time
      // Set time to the average of the two bins
      wireBx=wireBx+(float)side/2.;
      unchanged=false;
    }
  }
  // If no match is found then check the other side
  if ((bestMatch-side)>-1 && (bestMatch-side)<(int)timeBinsOn.size() && unchanged) {       // Make sure one next to it exists
    if (timeBinsOn[bestMatch]==(timeBinsOn[bestMatch-side]+side)) {    // See if nextbin on is consecutive in time
      wireBx=wireBx-(double)side/2.;
      unchanged=false;
    }
  }
  return wireBx - anode_bx_offset; // expect collision muons to be centered near 0 bx
}

CSCRecHit2D CSCMake2DRecHit::hitFromStripAndWire	(	const CSCDetId &	id,
		const CSCLayer *	layer,
		const CSCWireHit &	wHit,
		const CSCStripHit &	sHit
	)

Make 2D hits when have both wire and strip hit available in same layer.

Correct the 3x3 ADC sum into the energy deposited in the layer. Note: this correction will give you dE. In order to get the dE/dX, you will need to divide by the path length... If the algorithm to compute the corrected energy fails, flag it by a specific nonsense value: If the user has chosen not to use the gas gain correction ---> -998. If the gas gain correction from the database is a bad value -> -997. If it is an edge strip --------------------------------------> -996. If gas-gain is OK, but the ADC vector is the wrong size ----> -999. If the user has created the Rechit without the energy deposit> -995.

store rechit

Retrive the L1APhase+strips combination

L1A

Retrive the Bx + wgroups combination

BX

L1A;

BX

To see RecHit content (L1A feature included) (to be commented out)

Definition at line 43 of file CSCMake2DRecHit.cc.

Referenced by CSCRecHitDBuilder::build().

{
  // Cache layer info for ease of access
  layer_        = layer;
  layergeom_    = layer_->geometry();
  specs_        = layer->chamber()->specs();
  id_           = id;
  
  const float sqrt_12 = 3.4641;
  
  float tpeak = -99.;
  
  CSCRecHit2D::ADCContainer adcMap;
  CSCRecHit2D::ChannelContainer wgroups;
  
  // Find wire hit position and wire properties
  wgroups = wHit.wgroups();

  int wg_left = wgroups[0];;
  int wg_right = wgroups[wgroups.size()-1];
  
  int Nwires1 = layergeom_->numberOfWiresPerGroup( wg_left );
  int Nwires2 = layergeom_->numberOfWiresPerGroup( wg_right );

  float Mwire1 = layergeom_->middleWireOfGroup( wg_left );
  float Mwire2 = layergeom_->middleWireOfGroup( wg_right );
  
  int centerWire_left = (int) (Mwire1 - Nwires1 / 2. + 0.5);
  int centerWire_right = (int) (Mwire2 + Nwires2 / 2.);
  
  float centerWire = (centerWire_left + centerWire_right) / 2.;

  //---- WGs around dead HV segment regions may need special treatment...
  //---- This is not addressed here.
    
  float sigmaWire = 0.;
  if(wHit.deadWG()>0 || wgroups.size()>2){
    //---- worst possible case; take most conservative approach
    for(unsigned int iWG=0;iWG<wgroups.size();iWG++){
      sigmaWire+=layergeom_->yResolution( wgroups[iWG] );
    }
  }
  else if(2==wgroups.size()){
    //---- 2 WGs - get the larger error (overestimation if a single track is passing
    //---- between the WGs; underestimation if there are two separate signal sources)
    if(layergeom_->yResolution( wgroups[0] ) > layergeom_->yResolution( wgroups[1] )){
      sigmaWire  = layergeom_->yResolution( wgroups[0]);
    }    
    else{
      sigmaWire  = layergeom_->yResolution( wgroups[1]);
    }
  }  
  else if(1==wgroups.size()){
    //---- simple - just 1 WG
    sigmaWire  = layergeom_->yResolution( wgroups[0]);
  }
  
  // Find strips position and properties
  
  CSCRecHit2D::ChannelContainer strips = sHit.strips();
  int tmax = sHit.tmax();
  int nStrip = strips.size();
  int idCenterStrip = nStrip/2;
  int centerStrip = strips[idCenterStrip];
  
  // Retrieve strip pulseheights from the CSCStripHit
  const std::vector<float>& adc    = sHit.s_adc();
  const std::vector<float>& adcRaw = sHit.s_adcRaw();

  std::vector<float> adc2;
  std::vector<float> adc2Raw;

  LogTrace("CSCRecHit") << "CSCMake2DRecHit: dump of adc values to be added to rechit follows...";

  for ( int iStrip = 0; iStrip < nStrip; ++iStrip) {

    adc2.clear();
    adc2Raw.clear();
    adc2.reserve(4);
    adc2Raw.reserve(4);
    for ( int t = 0; t < 4; ++t ){
      adc2.push_back(adc[t+iStrip*4]);
      adc2Raw.push_back(adcRaw[t+iStrip*4]);
    }
    //After CMSSW_5_0: ADC value is pedestal-subtracted and electronics-gain corrected
    adcMap.put( strips[iStrip], adc2.begin(), adc2.end() ); 
    // Up to CMSSW_5_0, Rechit takes _raw_ adc values
    // adcMap.put( strips[iStrip], adc2Raw.begin(), adc2Raw.end() ); 

    LogTrace("CSCRecHit") << "CSCMake2DRecHit: strip = " << strips[iStrip] << 
      " adcs= " << adc2Raw[0] << " " << adc2Raw[1] << " " << adc2Raw[2] << " " << adc2Raw[3];

  }

  //The tpeak finding for both edge and non-edge strips has been moved to here
  //tpeak will be a const argument for xMatchGatti_->findXOnStrip
  float adcArray[4];
  for ( int t = 0; t < 4; ++t ) {
    int k = t+4*(idCenterStrip);
    adcArray[t] = adc[k];
  }
  tpeak = peakTimeFinder_->peakTime( tmax, adcArray, tpeak ); 
  // Just for completeness, the start time of the pulse is 133 ns earlier, according to Stan :)
  float t_zero = tpeak - 133.;
  LogTrace("CSCRecHit|CSCMake2DRecHit") << "CSCMake2DRecHit: " << 
    id << " strip=" << centerStrip << ", t_zero=" << t_zero << ", tpeak=" << tpeak;


  float positionWithinTheStrip= -99.;
  float sigmaWithinTheStrip = -99.;
  int quality = -1;
  LocalPoint lp0(0., 0.);
  
  float stripWidth = -99.;
  // If at the edge, then used 1 strip cluster only
  if ( centerStrip == 1 || centerStrip == specs_->nStrips() || nStrip < 2 ) {
    lp0 = layergeom_->stripWireIntersection( centerStrip, centerWire);
    positionWithinTheStrip = 0.;
    stripWidth = layergeom_->stripPitch(lp0);
    sigmaWithinTheStrip = stripWidth / sqrt_12;
    quality = 2;
  }
  else {
    // If not at the edge, used cluster of size ClusterSize:
    LocalPoint lp11  = layergeom_->stripWireIntersection( centerStrip, centerWire);
    stripWidth = layergeom_->stripPitch( lp11 );
    
    //---- Calculate local position within the strip
    float xWithinChamber = lp11.x();
    quality = 0;
    if(layergeom_->inside(lp11 )){// save time; this hit is to be discarded anyway - see isHitInFiducial(...)

      xMatchGatti_->findXOnStrip( id, layer_, sHit, centerStrip, 
                                  xWithinChamber,
                                  stripWidth,  tpeak, positionWithinTheStrip, 
                                  sigmaWithinTheStrip, quality);
    }                           
    lp0 = LocalPoint( xWithinChamber, layergeom_->yOfWire(centerWire, xWithinChamber) );
  }

  
  
  // compute the errors in local x and y
  LocalError localerr = layergeom_->localError( centerStrip, 
                                                sigmaWithinTheStrip, sigmaWire );

  // Before storing the recHit, take the opportunity to change its time
  if (useTimingCorrections){
    float chipCorrection = recoConditions_->chipCorrection(id,centerStrip);
    float phaseCorrection = (sHit.stripsl1a()[0]>> (15-0) & 0x1)*25.;
    float chamberCorrection = recoConditions_->chamberTimingCorrection(id);

    GlobalPoint gp0 = layer_->toGlobal(lp0);
    float tofCorrection = gp0.mag()/29.9792458;
    float signalPropagationSpeed[11] = {0.0, -78, -76, -188, -262, -97, -99, -90, -99, -99, -113};
    float position = lp0.y()/sin(layergeom_->stripAngle(centerStrip));
    float yCorrection = position/signalPropagationSpeed[id_.iChamberType()];
    //printf("RecHit in e:%d s:%d r:%d c:%d l:%d strip:%d \n",id.endcap(),id.station(), id.ring(),id.chamber(),id.layer(),centerStrip);
    //printf("\t tpeak before = %5.2f \t chipCorr %5.2f phaseCorr %5.2f chamberCorr %5.2f tofCorr %5.2f \n",
    //     tpeak,chipCorrection, phaseCorrection,chamberCorrection,tofCorrection);
    //printf("localy = %5.2f, yCorr = %5.2f \n",lp0.y(),yCorrection);
    tpeak = tpeak + chipCorrection + phaseCorrection + chamberCorrection-tofCorrection+yCorrection;
    //printf("\t tpeak after = %5.2f\n",tpeak);
  }

  // Calculate wire time to the half bx level using time bins on
  // Store wire time with a precision of 0.01 as an int (multiply by 100)
  // Convert from bx to ns (multiply by 25)
  int scaledWireTime = 100*findWireBx(wHit.timeBinsOn(), tpeak,id)*25; 


  //Get the gas-gain correction for this rechit
  float gasGainCorrection = -999.;   
  if (useGasGainCorrections) {
    gasGainCorrection = recoConditions_->gasGainCorrection(id,centerStrip,centerWire);
  } 

  float energyDeposit = -999.;
  if (gasGainCorrection < -998.) {
    // if the user has chosen not to use the gas gain correction, set the energy to a different nonsense value
    energyDeposit = -998.;

  } else if (gasGainCorrection < 0.) {
    // if the gas gain correction from the database is a bad value, set the energy to yet another nonsense value
    energyDeposit = -997.;

  } else {
    // gas-gain correction is OK, correct the 3x3 ADC sum
    if (adcMap.size()==12) {
      energyDeposit =
        adcMap[0] * gasGainCorrection + adcMap[1] * gasGainCorrection + adcMap[2] * gasGainCorrection +
        adcMap[4] * gasGainCorrection + adcMap[5] * gasGainCorrection + adcMap[6] * gasGainCorrection +
        adcMap[8] * gasGainCorrection + adcMap[9] * gasGainCorrection + adcMap[10]* gasGainCorrection ; 

    } else if (adcMap.size()==4) {
      // if this is an edge strip, set the energy to yet another nonsense value
      energyDeposit = -996.;
    }

  }


   CSCRecHit2D::ChannelContainer L1A_and_strips = sHit.stripsTotal();        

   CSCRecHit2D::ChannelContainer BX_and_wgroups = wHit.wgroupsBXandWire();   
  // (sigmaWithinTheStrip/stripWidth) is in strip widths just like positionWithinTheStrip is!
     CSCRecHit2D rechit( id, lp0, localerr, L1A_and_strips,                  
     //adcMap, wgroups, tpeak, positionWithinTheStrip,
      adcMap, BX_and_wgroups, tpeak, positionWithinTheStrip,        
      sigmaWithinTheStrip/stripWidth, quality, sHit.deadStrip(), wHit.deadWG(), scaledWireTime,
      energyDeposit);

  // rechit.print();

  LogTrace("CSCRecHit") << "CSCMake2DRecHit: rechit created in layer " << id << "... \n" << rechit << "\n";

  return rechit;

}

bool CSCMake2DRecHit::isHitInFiducial	(	const CSCLayer *	layer,
		const CSCRecHit2D &	rh
	)

Test if rechit is in fiducial volume.

Definition at line 276 of file CSCMake2DRecHit.cc.

References CSCLayer::geometry(), CSCLayerGeometry::inside(), layergeom_, and CSCRecHit2D::localPosition().

Referenced by CSCRecHitDBuilder::build().

                                                                                    {

  bool isInFiducial = true;
  const CSCLayerGeometry* layergeom_ = layer->geometry();
  LocalPoint rhPosition =  rh.localPosition();
  // is the rechit within the chamber? 
  //(the problem occurs in ME11a/b otherwise it is OK)
  // we could use also 
  //bool inside( const Local3DPoint&, const LocalError&, float scale=1.f ) const;
  if(!layergeom_->inside(rhPosition)){
    isInFiducial = false;
  }
  
  return isInFiducial;
}

void CSCMake2DRecHit::setConditions ( const CSCRecoConditions * reco )

Pass pointer to conditions data onwards.

Definition at line 293 of file CSCMake2DRecHit.cc.

References dt_dqm_sourceclient_common_cff::reco, recoConditions_, CSCXonStrip_MatchGatti::setConditions(), and xMatchGatti_.

Referenced by CSCRecHitDBuilder::setConditions().

                                                                   {
  xMatchGatti_->setConditions( reco );
  // And cache for use here
  recoConditions_ = reco;
}