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The LHCb detector consists of several sub-detectors, including (1) the Vertex Locator (VELO), (2) the Trigger Tracker (TT), (3) a large dipole analysis magnet, (4) Tracking stations (T1-T3), which consist of silicon strip detectors near the beamline (IT) and an outer tracker (OT) using straw tubes further away, (5) two Ring Imaging Cherenkov Detectors (RICH1 & RICH2) for particle identification, (6) an Electromagnetic calorimeter (ECAL) with a Scintillating Photon Detector (SPD/PS), (7) a hadron calorimeter (HCAL) and a (8) a muon detector (M1-M4, M3, M4 not shown)

The Global Alignment task is charged with:

Defining a means by which to align the entire LHCb detector, assuming individual subdetectors are internally aligned.

Implement the software needed to perform automated alignment on a fill-by-fill basis. This is necessary because after each fill, the VELO is retracted and only re-inserted after stable colliding beam has been re-established. Moreover, the dipole analysis magnet ramps up and down in between each fill so that in principle the fringe field could produce small magnetic deflections of other subdetectors.

The basic procedure and preliminary results are shown in the Procedure link

This page was last updated on 03/28/06 by Steven Blusk.