The ATLAS Barrel Alignment Readout System

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Presentation transcript:

The ATLAS Barrel Alignment Readout System SUSY-Suchen mit b-Jets Graduiertenkolleg H. v/d Graaf, H. Groenstege, R. Hart, NIKHEF, Amsterdam, Netherlands F. Bauer, CEA-IRFU, Saclay, France P.F. Giraud, CERN, Geneva, Switzerland ICALEPCS 2009, Kobe, Japan Coded Masks ATLAS Muon Spectrometer Precision Track Reconstruction: ± 1200 Monitored Drift Tube Chambers (MDTs) Barrel: parallel to beam Endcap: perpendicular to beam Channel Types: Inplane MDT deformation Praxial Plane alignment Axial Plane alignment Projective Tower alignment Reference Link to the toroid Result parameters: Translation x Translation y Rotation angle θ Magnification Rasnik type 5296 channels (91.2%) Spot type 516 channels (8.8%) Barrel Alignment System: goal: measure deformation and position of the barrel chambers performed by 5812 optical lines (channels) data stored into database for off-line analysis accuracy of track sagitta: < 50 μm Rasnik (Red Alignment System NIKHEF) Original type developed at Amsterdam Chess board with encoded edges Analysis: FOAM (FOurier Analysis Method) Distortion during magnet test Optical Line (Channel) Rasdim & PVSS Rasdim TopMux DIM: Lightweight communication protocol Communication: PVSS ↔ Rasdim Rasdim: Server; developed with VC++ Controls MUX and Framegrabber PVSS: SCADA (Supervisory Control and Data Acquisition) Datapoint concept Database: Results → CondDb Parameters ↔ ConfDb RasLed: 9 infra-red LEDs RasCam: CMOS 392 x 292 pixels 50 mm 42 mm PVSS Manager concept (ETM) Hardware Configuration Channel Parameters FSM USA15 MasterMux 8 PC (W-XP) + 1 super-visor + 1 spare Frame-grabber: Data Translation DT3162 3-level multiplexing scheme ±10 minutes full cycle FSM: Barrel Alignment Concepts: Passive system (no commands) State/Status based on number of errors and storage to database RasMux References [1] H.Groenstege et al., “The Rasnik”, ATLAS MUON Note 63 (1994) [2]tRasnik homepage: http://www.nikhef.nl/pub/departments/et/experiments/atlas/rasnik/index.html [3] C.Guyot et al., “The alignment system of the ATLAS barrel muon spectrometer”, ATLAS Note ATL-MUON-PUB-2008-007