Package Alignment/LaserAlignment

Source code (CVS tag: @) - Administrative privileges

Description

This package contains the reconstruction code for the Laser Alignment System in the Tracker.

Public interface

• AlignmentAlgorithmBW: alignment algorithm developed by Bruno Wittmer. Used to calculate the alignment parameters using the data from the Laser Alignment System.
• BeamProfileFitter: fit a gaussian to the laser beam profiles.
• LaserAlignmentAlgorithmNegTEC: interface to the alignment algorithm for TEC-.
• LaserAlignmentAlgorithmPosTEC: interface to the alignment algorithm for TEC+.
• LaserAlignmentAlgorithmTEC2TEC: interface to the alignment algorithm to align TIB, TOB and both TEC's relative to each other.
• LaserAlignmentNegTEC: pass the reconstructed beam positions to the alignment algorithm for TEC-.
• LaserAlignmentPosTEC: pass the reconstructed beam positions to the alignment algorithm for TEC+.
• LaserAlignmentTEC2TEC: pass the reconstructed beam positions to the alignment algorithm for TIB, TOB and TEC alignment.
• LaserBeamClusterizer: clusterize the laser signals.
• LaserClusterizerAlgorithm: algorithm to clusterize the laser signals (based on the result of the beam profile fit).
• LaserHitPairGeneratorFromLayerPair: search for hit pairs on consecutive layers (used by the seed finder).
• LaserHitPairGenerator: create hit pairs (used by the seed finder).
• LaserLayerPairs: create pairs of layers (used by the seed finder).
• LASvec: vector algebra needed by AlignmentAlgorithmBW.
• LASvec2D: vector and matrix algebra needed by AlignmentAlgorithmBW.
• LayerWithHits: look for layers with hits (used by the seed finder).
• Millepede: algorithm used for alignment.
• OrderedLaserHitPair: ordered pair of laser hits (used by the seed finder).
• OrderedLaserHitPairs: collection of OrderedLaserHitPairs (used by the seed finder).
• SeedGeneratorForLaserBeams: seed finder; seeds are used to create reconstructed tracks out of the laser beams in the endcaps.
• SeedLayerPairs: base class for LaserLayerPairs (used by the seed finder).

Modules

• LaserAlignment: main reconstruction module of the Laser Alignment System.

• LaserClusterizer: build clusters from the laser signals.

• LaserSeedGenerator: create seeds for the track reconstruction of the laser beams.

Unit tests and examples

• ExpectedCorrectionsCalculator: calculate the expected alignment corrections from the applied misalignment (you have to provide the applied misalignments in the configuration file!).
• ReadLaserRecHit: analyzer for printing information about reconstructed hits from the laser beams.
• RecoAnalyzer: small analyzer to fill some histograms with information about the reconstruction of the laser beams.

• runP.cfg: run the reconstruction code of the Laser Alignment System, clusterize the beams, convert the clusters to RecHits, create seeds and do the track reconstruction of the laser beams.
• iguana.cfg: configuration file to visualize lasertracks with IGUANA

Status and planned development

Almost completed; finish storage of alignment corrections in the DB, implement algorithm to automatically select the layer for which the intensity of the laser beam is currently optimized.

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Last updated: @ Author: Maarten Thomas.