---

LASGeometryUpdater Class Reference

#include <Alignment/LaserAlignment/src/LASGeometryUpdater.h>

List of all members.

Public Member Functions
	LASGeometryUpdater ()
void	Update (LASEndcapAlignmentParameterSet &, LASBarrelAlignmentParameterSet &, AlignableTracker &)
	merge the output from endcap and barrel algorithms and update the AlignableTracker object

---

Detailed Description

Definition at line 11 of file LASGeometryUpdater.h.

---

Constructor & Destructor Documentation

LASGeometryUpdater::LASGeometryUpdater

(

)

Definition at line 8 of file LASGeometryUpdater.cc.

                                       {
}

---

Member Function Documentation

void LASGeometryUpdater::Update	(	LASEndcapAlignmentParameterSet &	endcapParameters,
		LASBarrelAlignmentParameterSet &	barrelParameters,
		AlignableTracker &	theAlignableTracker
	)

merge the output from endcap and barrel algorithms and update the AlignableTracker object

the AlignableTracker is expected to be perfectly aligned!!

Definition at line 21 of file LASGeometryUpdater.cc.

References AlignableTracker::endCaps(), LASBarrelAlignmentParameterSet::GetParameter(), LASEndcapAlignmentParameterSet::GetParameter(), AlignableTracker::innerHalfBarrels(), AlignableTracker::outerHalfBarrels(), and muonGeometry::wheel.

Referenced by LaserAlignment::endJob().

                                                                         {


  // first, we access the half barrels of TIB and TOB
  const align::Alignables& theOuterHalfBarrels = theAlignableTracker.outerHalfBarrels();
  const align::Alignables& theInnerHalfBarrels = theAlignableTracker.innerHalfBarrels();

  // then the TECs and treat them also as half barrels 
  const align::Alignables& theEndcaps = theAlignableTracker.endCaps();

  // re-arrange to match the structure in LASBarrelAlignmentParameterSet and simplify the loop
  // 2 (TIB+), 3 (TIB-), 4 (TOB+), 5 (TOB-)
  std::vector<Alignable*> theHalfBarrels( 6 );
  theHalfBarrels.at( 0 ) = theEndcaps.at( 0 ); // TEC+
  theHalfBarrels.at( 1 ) = theEndcaps.at( 1 ); // TEC-
  theHalfBarrels.at( 2 ) = theInnerHalfBarrels.at( 1 ); // TIB+
  theHalfBarrels.at( 3 ) = theInnerHalfBarrels.at( 0 ); // TIB-
  theHalfBarrels.at( 4 ) = theOuterHalfBarrels.at( 1 ); // TOB+
  theHalfBarrels.at( 5 ) = theOuterHalfBarrels.at( 0 ); // TOB-

  // z difference of half barrel end faces (= hb-length)
  // do this more intelligent later..
  std::vector<double> theBarrelLength( 6, 0. );
  theBarrelLength.at( 0 ) = 1348.65; // TEC
  theBarrelLength.at( 1 ) = 1348.65;
  theBarrelLength.at( 2 ) = 400.;  // TIB
  theBarrelLength.at( 3 ) = 400.;
  theBarrelLength.at( 4 ) = 790.;  // TOB
  theBarrelLength.at( 5 ) = 790.;


  // half barrel loop (no TECs -> det>1)
  for( int halfBarrel = 2; halfBarrel < 6; ++halfBarrel ) {
    
    // average x displacement = (dx1+dx2)/2
    const align::GlobalVector dxLocal( ( barrelParameters.GetParameter( halfBarrel, 0, 0 ).first + barrelParameters.GetParameter( halfBarrel, 1, 0 ).first ) / 2., 0., 0. );
    theHalfBarrels.at( halfBarrel )->move( dxLocal );

    // average y displacement = (dy1+dy2)/2
    const align::GlobalVector dyLocal( 0., ( barrelParameters.GetParameter( halfBarrel, 0, 1 ).first + barrelParameters.GetParameter( halfBarrel, 1, 1 ).first ) / 2., 0. );
    theHalfBarrels.at( halfBarrel )->move( dyLocal );

    // rotation around x axis = (dy2-dy1)/L
    const align::Scalar rxLocal = ( barrelParameters.GetParameter( halfBarrel, 1, 2 ).first - barrelParameters.GetParameter( halfBarrel, 0, 2 ).first ) / theBarrelLength.at( halfBarrel );
    theHalfBarrels.at( halfBarrel )->rotateAroundLocalX( rxLocal );
    
    // rotation around y axis = (dx1-dx2)/L
    const align::Scalar ryLocal = ( barrelParameters.GetParameter( halfBarrel, 0, 1 ).first - barrelParameters.GetParameter( halfBarrel, 1, 1 ).first ) / theBarrelLength.at( halfBarrel );
    theHalfBarrels.at( halfBarrel )->rotateAroundLocalY( ryLocal );
    
    // average rotation around z axis = (dphi1+dphi2)/2
    const align::Scalar rzLocal = ( barrelParameters.GetParameter( halfBarrel, 0, 0 ).first + barrelParameters.GetParameter( halfBarrel, 1, 0 ).first ) / 2.;
    theHalfBarrels.at( halfBarrel )->rotateAroundLocalZ( rzLocal );

  }


  // now fit the endcaps into that alignment tube frame. the strategy is the following:
  //
  // 1. apply the parameters from the endcap algorithm to the individual disks
  // 2. the tec as a whole is rotated and moved such that the innermost disk (1) (= halfbarrel inner endface) 
  //    reaches the position determined by the barrel algorithm. 
  // 3. then, the TEC is twisted and sheared until the outermost disk (9) reaches nominal position 
  //    (since it has been fixed there in the alignment tube frame). this resolves any common
  //    shear and torsion within the TEC coordinate frame.


  // shortcut to the z positions of the disks' mechanical structures (TEC+/-, 9*disk)
  std::vector<std::vector<double> > wheelZPositions( 2, std::vector<double>( 9, 0. ) );
  for( int wheel = 0; wheel < 9; ++wheel ) {
    wheelZPositions.at( 0 ).at( wheel ) = 10. * theEndcaps.at( 0 )->components().at( wheel )->globalPosition().z(); // 10.*: these are in cm!
    wheelZPositions.at( 1 ).at( wheel ) = 10. * theEndcaps.at( 1 )->components().at( wheel )->globalPosition().z();
  }

  // we can do this for both TECs in one go;
  // only real difference is the index change in the second argument to barrelParameters::GetParameter:
  // here the disk index changes from 0(+) to 1(-), since the end faces are sorted according to z (-->side=det)
  for( int det = 0; det < 2; ++ det ) {

    const int& side = det;

    // step 1: apply the endcap algorithm parameters
    for( int wheel = 0; wheel < 9; ++ wheel ) {
      theEndcaps.at( det )->components().at( wheel )->rotateAroundLocalZ( endcapParameters.GetParameter( det, wheel, 0 ).first );
      const align::GlobalVector dXY( endcapParameters.GetParameter( det, wheel, 1 ).first, endcapParameters.GetParameter( det, wheel, 2 ).first, 0. );
      theEndcaps.at( det )->components().at( wheel )->move( dXY );
    }
    
    // step 2: attach the innermost disk (1)
    
    // rotation around z of disk 1
    const align::Scalar dphi1 = barrelParameters.GetParameter( det, side, 0 ).first - endcapParameters.GetParameter( det, 0, 0 ).first;
    theEndcaps.at( det )->rotateAroundLocalZ( dphi1 );
    
    // displacement in x,y of disk 1
    const align::GlobalVector dxy1( barrelParameters.GetParameter( det, side, 1 ).first - endcapParameters.GetParameter( det, 0, 1 ).first, 
                                    barrelParameters.GetParameter( det, side, 2 ).first - endcapParameters.GetParameter( det, 0, 2 ).first,
                                    0. );
    theEndcaps.at( det )->move( dxy1 );
    
    // determine the resulting phi, x, y of disk 9 after step 2
    const align::Scalar resultingPhi9 = endcapParameters.GetParameter( det, 8, 0 ).first + dphi1; // better calculate this rather than use a getter
    const align::GlobalVector resultingXY9( theEndcaps.at( det )->components().at( 8 )->globalPosition().x(),
                                            theEndcaps.at( det )->components().at( 8 )->globalPosition().y(),
                                            0. );
    
    
    // step 3: twist and shear back
    
    // the individual rotation/movement of the wheels is a function of their z-position
    for( int wheel = 0; wheel < 9; ++wheel ) {
      const double reducedZ = fabs( wheelZPositions.at( det ).at( wheel ) - wheelZPositions.at( det ).at( 0 ) ) / theBarrelLength.at( det );
      theEndcaps.at( det )->components().at( wheel )->rotateAroundLocalZ( -1. * reducedZ * resultingPhi9 ); // twist
      theEndcaps.at( det )->components().at( wheel )->move( -1. * reducedZ * resultingXY9 ); // shear
    }

  } 



  // this should now give all zero
//   std::cout << theEndcaps.at( 0 )->components().at( 8 )->rotation().xy() << std::endl; /////////////////////////////////
//   std::cout << "000+: " << theEndcaps.at( 0 )->components().at( 8 )->globalPosition().x() << "  "
//          << theEndcaps.at( 0 )->components().at( 8 )->globalPosition().y() << std::endl; /////////////////////////////////
    
//   std::cout << "---------------------------------" << std::endl;

//   std::cout << theEndcaps.at( 1 )->components().at( 8 )->rotation().xy() << std::endl; /////////////////////////////////
//   std::cout << "000-: " << theEndcaps.at( 1 )->components().at( 8 )->globalPosition().x() << "  "
//          << theEndcaps.at( 1 )->components().at( 8 )->globalPosition().y() << std::endl; /////////////////////////////////
  
}

---

The documentation for this class was generated from the following files:

• Alignment/LaserAlignment/src/LASGeometryUpdater.h
• Alignment/LaserAlignment/src/LASGeometryUpdater.cc

---