CSCChannelTranslator.cc

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#include "CondFormats/CSCObjects/interface/CSCChannelTranslator.h"

int CSCChannelTranslator::rawStripChannel(const CSCDetId& id, int igeo) const {
  // Translate a geometry-oriented strip channel in range 1-80, igeo,
  // into corresponding raw channel.

  int iraw = igeo;

  bool zplus = (id.endcap() == 1);

  bool me1a = (id.station() == 1) && (id.ring() == 4);
  bool me1b = (id.station() == 1) && (id.ring() == 1);

  if (me1a && zplus) {
    iraw = 17 - iraw;
  }  // 1-16 -> 16-1
  if (me1b && !zplus) {
    iraw = 65 - iraw;
  }  // 1-64 -> 64-1
  if (me1a) {
    iraw += 64;
  }  // set 1-16 to 65-80

  return iraw;
}

int CSCChannelTranslator::geomStripChannel(const CSCDetId& id, int iraw) const {
  // Translate a raw strip channel in range 1-80, iraw,  into
  // corresponding geometry-oriented channel in which increasing
  // channel number <-> strip number increasing with +ve local x.

  int igeo = iraw;

  bool zplus = (id.endcap() == 1);
  bool me11 = (id.station() == 1) && (id.ring() == 1);
  bool me1a = me11 && (iraw > 64);
  bool me1b = me11 && (iraw <= 64);

  if (me1a)
    igeo -= 64;  // 65-80 -> 1-16
  //if ( me1a ) igeo %= 64; // 65-80 -> 1-16
  if (me1a && zplus) {
    igeo = 17 - igeo;
  }  // 65-80 -> 16-1
  if (me1b && !zplus) {
    igeo = 65 - igeo;
  }  // 1-64 -> 64-1

  return igeo;
}

int CSCChannelTranslator::channelFromStrip(const CSCDetId& id, int strip) const {
  // This just returns the electronics channel label to which a given strip is connected
  // In all chambers but ME1A this is just a direct 1-1 correspondence.
  // In ME1A the 48 strips are ganged into 16 channels: 1+17+33->1, 2+18+34->2, ... 16+32+48->16.
  int ichan = strip;
  bool me1a = (id.station() == 1) && (id.ring() == 4);
  if (me1a && strip > 16)
    ichan = (strip - 1) % 16 + 1;  // gang the 48 to 16
  return ichan;
}

CSCDetId CSCChannelTranslator::rawCSCDetId(const CSCDetId& id) const {
  // Return the effective online CSCDetId for given offline CSCDetId
  // That means the same one except for ME1A, which online is part of ME11 (channels 65-80)
  CSCDetId idraw(id);
  bool me1a = (id.station() == 1) && (id.ring() == 4);
  if (me1a)
    idraw = CSCDetId(id.endcap(), id.station(), 1, id.chamber(), id.layer());
  return idraw;
}