DTT0FEBPathCorrection.cc

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/*
 *  See header file for a description of this class.
 *
 *  $Date: 2012/04/10 17:55:08 $
 *  $Revision: 1.1 $
 *  \author Mark Olschewski
 */

#include "DTT0FEBPathCorrection.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Framework/interface/EventSetup.h"
#include "FWCore/Framework/interface/ESHandle.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"

#include "Geometry/Records/interface/MuonGeometryRecord.h"
#include "Geometry/DTGeometry/interface/DTGeometry.h"
#include "Geometry/DTGeometry/interface/DTSuperLayer.h"

#include "DataFormats/MuonDetId/interface/DTWireId.h"
#include "CondFormats/DTObjects/interface/DTT0.h"
#include "CondFormats/DataRecord/interface/DTT0Rcd.h"

#include <string>
#include <sstream>

using namespace std;
using namespace edm;

namespace dtCalibration {

DTT0FEBPathCorrection::DTT0FEBPathCorrection(const ParameterSet& pset):
   calibChamber_( pset.getParameter<string>("calibChamber") ) {

   //DTChamberId chosenChamberId;
   if( calibChamber_ != "" && calibChamber_ != "None" && calibChamber_ != "All" ){
      stringstream linestr;
      int selWheel, selStation, selSector;
      linestr << calibChamber_;
      linestr >> selWheel >> selStation >> selSector;
      chosenChamberId_ = DTChamberId(selWheel, selStation, selSector);
      LogVerbatim("Calibration") << "[DTT0FEBPathCorrection] Chosen chamber: " << chosenChamberId_ << endl;
   }
   //FIXME: Check if chosen chamber is valid.
}

DTT0FEBPathCorrection::~DTT0FEBPathCorrection() {
}

void DTT0FEBPathCorrection::setES(const EventSetup& setup) {
   // Get t0 record from DB
   ESHandle<DTT0> t0H;
   setup.get<DTT0Rcd>().get(t0H);
   t0Map_ = &*t0H;
   LogVerbatim("Calibration") << "[DTT0FEBPathCorrection] T0 version: " << t0H->version();
}

DTT0Data DTT0FEBPathCorrection::correction(const DTWireId& wireId) {
   // Compute for selected chamber (or All) correction using as reference chamber mean

   DTChamberId chamberId = wireId.layerId().superlayerId().chamberId();

   if( calibChamber_ == "" || calibChamber_ == "None" )          return defaultT0(wireId);
   if( calibChamber_ != "All" && chamberId != chosenChamberId_ ) return defaultT0(wireId);

   // Access DB
   float t0Mean,t0RMS;
   int status = t0Map_->get(wireId,t0Mean,t0RMS,DTTimeUnits::counts);
   if(status != 0) 
      throw cms::Exception("[DTT0FEBPathCorrection]") << "Could not find t0 entry in DB for" 
                                                                << wireId << endl;
   int wheel = chamberId.wheel();
   int station = chamberId.station();
   int sector = chamberId.sector();
   int sl = wireId.layerId().superlayerId().superlayer();
   int l = wireId.layerId().layer();
   int wire = wireId.wire();
   float t0MeanNew = t0Mean - t0FEBPathCorrection(wheel, station, sector, sl, l, wire);
   float t0RMSNew = t0RMS;
   return DTT0Data(t0MeanNew,t0RMSNew);
}

DTT0Data DTT0FEBPathCorrection::defaultT0(const DTWireId& wireId) {
   // Access default DB
   float t0Mean,t0RMS;
   int status = t0Map_->get(wireId,t0Mean,t0RMS,DTTimeUnits::counts);
   if(!status){
      return DTT0Data(t0Mean,t0RMS);
   } else{
      //... 
      throw cms::Exception("[DTT0FEBPathCorrection]") << "Could not find t0 entry in DB for"
     << wireId << endl;
   }
}

float DTT0FEBPathCorrection::t0FEBPathCorrection(int wheel, int st, int sec, int sl, int l, int w) {

  // Skip correction for the last row of cells of FEB20 (see above)
  if( (st==1 && ((sl!=2 && w ==49) || (sl==2 && w ==57))) || 
      ((st==2||st==3)&& (sl==2 && w ==57)) ) return 0.;

  
  float dist[8]={};

  // Path lenght differences for L1 and L3 (cm)
  if(l==1 || l ==3){
   
    dist[0] = +4.45;
    dist[1] = +2.45;
    dist[2] = -3.45;
    dist[3] = -5.45;
    dist[4] = -4.45;
    dist[5] = -2.45;
    dist[6] = +3.45;
    dist[7] = +5.45;
  }

  // Path lenght differences for L2 and L4 (cm)
  else {
    
    dist[0] = +5.45;
    dist[1] = +3.45;
    dist[2] = -2.45;
    dist[3] = -4.45;
    dist[4] = -5.45;
    dist[5] = -3.45;
    dist[6] = +2.45;
    dist[7] = +4.45;
  }
  
  
  // Wire position within the 8-cell period (2 FEBs). 
  // Note that wire numbers start from 1.
  int pos = (w-1)%8;

  // Special case: in MB2 phi and MB4-10, the periodicity is broken at cell 49, as there is 
  // an odd number of FEDs (15): the 13th FEB is connected on the left, 
  // and not on the right; i.e. one FEB (4 colums of cells) is skipped from what would 
  // be the regular structure.
  // The same happens in MB4-8/12 at cell 81.
  if ((st==2 && sl!=2 && w>=49) || 
      (st==4 && sec==10 && w>=49) || 
      (st==4 && (sec==8||sec==12) && w>=81) ) pos =(w-1+4)%8;

  // Inverse of the signal propagation speed, determined from the 
  // observed amplitude of the modulation. This matches what is found 
  // with CAD simulation using reasonable assumptions on the PCB specs.

  return dist[pos]*0.075;
  
}





} // namespace