CSCChamberSpecs.cc

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#include <Geometry/CSCGeometry/interface/CSCGeometry.h>
#include <Geometry/CSCGeometry/interface/CSCChamberSpecs.h>
#include <Geometry/CSCGeometry/interface/CSCLayerGeometry.h>
#include <Geometry/CSCGeometry/interface/CSCWireGroupPackage.h>
#include <DataFormats/GeometrySurface/interface/TrapezoidalPlaneBounds.h>
#include <FWCore/MessageLogger/interface/MessageLogger.h>

using namespace GeomDetEnumerators;

CSCChamberSpecs::CSCChamberSpecs(const CSCGeometry* geom,
                                 int iChamberType,
                                 const TrapezoidalPlaneBounds& bounds,
                                 const CSCSpecsParcel& fupar,
                                 const CSCWireGroupPackage& wg)
    : GeomDetType("CSC", CSC),
      theChamberType(iChamberType),
      theSpecsValues(fupar),
      nstrips(static_cast<int>(specsValue(5))),
      stripDeltaPhi(specsValue(29)),
      centreToIntersectionOffset(specsValue(30)),
      gangedStrips_(false) {
  LogTrace("CSCChamberSpecs|CSC") << myName << ": constructing specs for chamber " << theName[iChamberType - 1]
                                  << ", type=" << iChamberType << ", this =" << this;

  // Reset gangedStrips_ for ME1A from config parameter
  if (iChamberType == 1)
    gangedStrips_ = geom->gangedStrips();

  // Most wire info now comes from wire group section of DDD, but this doesn't...
  float wireAngleInDegrees = specsValue(12);

  // Related to strip geometry...
  float stripOffset1 = specsValue(20);
  float stripOffset2 = specsValue(21);
  float globalRadialPositionOfAlignmentPin = specsValue(24);
  float distanceFrameToAlignmentPin = specsValue(25);
  float lengthOfChamber = specsValue(26);
  float distanceEndOfStripToAlignmentPin = specsValue(27);
  float extentOfStripPlane = specsValue(28);

  // local y of alignment pin
  float yAlignmentPin = -lengthOfChamber / 2. + distanceFrameToAlignmentPin;

  // distance from alignment pin to symmetry centre of strip plane
  float alignmentPinToCentreOfStripPlane = distanceEndOfStripToAlignmentPin + extentOfStripPlane / 2.;

  // local y of symmetry centre of strip plane
  float yCentreOfStripPlane = yAlignmentPin + alignmentPinToCentreOfStripPlane;

  // distance from intersection of strips to symmetry centre of strip plane
  float whereStripsMeet = globalRadialPositionOfAlignmentPin + alignmentPinToCentreOfStripPlane;

  // Possibly 'correct' distance to strip intersection
  //  if ( useCentreTIOffsets ) {
  //    float ctiOffset = this->ctiOffset();
  //    whereStripsMeet += ctiOffset;
  //  }
  whereStripsMeet += centreToIntersectionOffset;  // will have been reset to zero if not active

  // local y value of 1st wire in wire plane
  double yOfFirstWire = yAlignmentPin + wg.alignmentPinToFirstWire / 10.;  //@@ in cm

  // Build the unique LayerGeometry objects we require for each chamber type.
  // - There are 2 endcaps
  // - Alternate layers of strips are offset w.r.t. each other
  // - In ME11 the wire tilt angle needs to be a constant
  // global value; in the CMS local coordinates this is positive in +z
  // and negative in -z (magnitude 29 degrees as of 2002)

  // Thus we need 4 LGs differing in strip offset and wire angle

  float phiPitch = this->stripPhiPitch();

  // Layer thickness can come from specs too
  float hThickness = specsValue(32) / 10. / 2.;  // mm->cm, and then want half the thickness

  poszOddLayerGeometry = new CSCLayerGeometry(geom,
                                              iChamberType,
                                              bounds,
                                              nstrips,
                                              -stripOffset1,
                                              phiPitch,
                                              whereStripsMeet,
                                              extentOfStripPlane,
                                              yCentreOfStripPlane,
                                              wg,
                                              wireAngleInDegrees,
                                              yOfFirstWire,
                                              hThickness);

  poszEvenLayerGeometry = new CSCLayerGeometry(geom,
                                               iChamberType,
                                               bounds,
                                               nstrips,
                                               -stripOffset2,
                                               phiPitch,
                                               whereStripsMeet,
                                               extentOfStripPlane,
                                               yCentreOfStripPlane,
                                               wg,
                                               wireAngleInDegrees,
                                               yOfFirstWire,
                                               hThickness);

  negzOddLayerGeometry = new CSCLayerGeometry(geom,
                                              iChamberType,
                                              bounds,
                                              nstrips,
                                              -stripOffset1,
                                              phiPitch,
                                              whereStripsMeet,
                                              extentOfStripPlane,
                                              yCentreOfStripPlane,
                                              wg,
                                              -wireAngleInDegrees,
                                              yOfFirstWire,
                                              hThickness);

  negzEvenLayerGeometry = new CSCLayerGeometry(geom,
                                               iChamberType,
                                               bounds,
                                               nstrips,
                                               -stripOffset2,
                                               phiPitch,
                                               whereStripsMeet,
                                               extentOfStripPlane,
                                               yCentreOfStripPlane,
                                               wg,
                                               -wireAngleInDegrees,
                                               yOfFirstWire,
                                               hThickness);
}

CSCChamberSpecs::~CSCChamberSpecs() {
  LogTrace("CSCChamberSpecs|CSC") << myName << " destroying this=" << this;

  delete poszOddLayerGeometry;
  delete poszEvenLayerGeometry;
  delete negzOddLayerGeometry;
  delete negzEvenLayerGeometry;
}

bool CSCChamberSpecs::operator!=(const CSCChamberSpecs& specs) const {
  if ((theChamberType != specs.theChamberType))
    return true;
  else
    return false;
}

bool CSCChamberSpecs::operator==(const CSCChamberSpecs& specs) const { return !(operator!=(specs)); }

const Topology& CSCChamberSpecs::topology() const { return *(poszOddLayerGeometry->topology()); }

int CSCChamberSpecs::chamberType() const { return theChamberType; }

std::string CSCChamberSpecs::chamberTypeName() const { return theName[chamberType() - 1]; }

// Build theChamberType value for a (station, ring) pair
//             an integer 1-10 corresponding to
//        1           for S = 1  and R=A=4 split strips in ME11
//      2,3,4 =  R+1  for S = 1  and R = 1,2,3
//      5-10  = 2*S+R for S = 2,3,4 and R = 1,2

int CSCChamberSpecs::whatChamberType(int istation, int iring) {
  int i = 2 * istation + iring;  // i=2S+R
  if (istation == 1) {
    --i;  // ring 1R -> i=1+R (2S+R-1=1+R for S=1)
    if (i > 4) {
      i = 1;  // But ring 1A (R=4) -> i=1
    }
  }
  return i;
}

float CSCChamberSpecs::wireSpacing() const { return poszOddLayerGeometry->wirePitch(); }

float CSCChamberSpecs::stripNoise(float timeInterval) const {
  const float pF_cm = 0.75;
  return (constantNoise() + e_pF() * pF_cm * poszOddLayerGeometry->length()) / sqrt(timeInterval / 100.);
}

float CSCChamberSpecs::gasGain() const {
  // ME1/1 makes up for its small gap by a big electronics gain
  // so use one gas gain value for all chambers (=300000)
  return 3.0e05;
}

float CSCChamberSpecs::chargePerCount() const {
  if (theChamberType <= 2) {
    return 0.25;
  } else {
    return 0.5;
  }
}

// STATICS

// Define the name of each chamber type
const std::string CSCChamberSpecs::theName[] = {
    "ME1/a", "ME1/b", "ME1/2", "ME1/3", "ME2/1", "ME2/2", "ME3/1", "ME3/2", "ME4/1", "ME4/2"};

// Define name of this class
const std::string CSCChamberSpecs::myName = "CSCChamberSpecs";