J.-C. Barri è re

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A TLAS Align. PDR J.C. Barri è re (Saclay). P RAXIAL A LIGNMENT S YSTEM (barrel). positioning. Tool for the platform positioning. Platform positioning during MDT construction. QA/QC: in production site and at the CERN X-ray tomograph. J.-C. Barri è re. calibration. calibration of - PowerPoint PPT Presentation

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  • J.-C. BarrirePRAXIAL ALIGNMENT SYSTEM (barrel)positioningcalibrationcalibration of PRAXIAL partATLAS Align. PDRJ.C. Barrire (Saclay)calibration of AXIAL partPRAXIAL activeoptical elementsPlatform positioning duringMDT constructionTool for the platformpositioningQA/QC: in production site and at the CERN X-ray tomographconclusion

  • Top viewPRAXIAL ALIGNMENT SYSTEM PrincipleThe PRAXIAL system is used to unite a layer of chambers (about 6 MDT) to form a single rigid layer. It is composed by two systems:the axial system (overlapping Rasniks // to beam axis z ),the proximity system (2 short crossed Rasniks).The requirements for the axial are: 5 mm, for the proximity system: 5 mm and 30 mrad.The precision on the positioning of both systems are: 25 mm

    3D viewTop viewMDT chambersReference systemToroid ribATLAS Align. PDRJ.C. Barriere (Saclay)XZAtlas axisMDT- nMDT- n+1

  • installation of PRAXIAL platforms(on each production site)calibration of the PRAXIALpositioning toolsJ.-Ch. BarrirePRAXIAL ALIGNMENT SYSTEM (barrel)positioningcalibrationCalibration of PRAXIAL partfinal QA/QC with the CERN X-ray tomographATLAS Align. PDRJ.C. Barrire (Saclay)calibration of AXIAL partPrinciple

  • PRAXIAL ALIGNMENT SYSTEM CalipraxATLAS Align. PDRJ.C. Barrire (Saclay)HARDWARE:6 axis motorised table with end-switches, range 5 mm, 10 mrad.stiff mechanical structure,displacement sensors (rasnik/linear encoders) = 1m,temperature probes,1 PC computer for control and calibration.

    SOFTWARE:ICARAS (rasnik readout),MINUIT routines (fit),C++ (general program).

    ACCURACY 5 m, 30 rad.

  • PRAXIAL ALIGNMENT SYSTEM Calibration of proximity part.ATLAS Align. PDRJ.C. Barrire (Saclay)Masks & CCD:Lenses:1 movement: 2*4 known parameters1 movement: 6 know parameters8N > 36N: number of measurementsKnown withlinear encodersMeasured withpraxial rasniksAt least 66 movements

  • PRAXIAL ALIGNMENT SYSTEM Manual calibration.ATLAS Align. PDRJ.C. Barrire (Saclay)1st step: 40 movements for calibration.2 nd step: 140 movements:55 pure movements95 combined movements.

  • installation of PRAXIAL platforms(on each production site)calibration of the PRAXIALpositioning toolsJ.-Ch. BarrirePRAXIAL ALIGNMENT SYSTEM (barrel)positioningcalibrationCalibration of PRAXIAL partfinal QA/QC with the CERN X-ray tomographATLAS Align. PDRJ.C. Barrire (Saclay)Calibration of AXIAL partPrinciple

  • ATLAS Align. PDRJ.C. Barrire (Saclay)PRAXIAL ALIGNMENT SYSTEM Calibration of axial part.1st STEP (manual operation):

    Calibration of 3 cubes containing Rasnik elements (mask, Lens, CCD)

    7 measurements (X, Y, Q & g ) to control the position of the rasnik elements in the cubes and the bench geometry.2nd STEP:

    Calibration of the axial elements.One of the cubes is replaced by the axial element to be calibrated.

    1 measurement/ axial optical element5 m long marble2Dx

  • ATLAS Align. PDRJ.C. Barrire (Saclay)PRAXIAL ALIGNMENT SYSTEM Conclusion: status & schedule.PROXIMITY CALIBRATION (2*1250 units, 6 different gaps):

    Status: 6 axis motorised tables, endswitches, linear sensors are available. Software is under construction. Mechanical structure is studiedSchedule: first calibration in september 2001.AXIAL CALIBRATION:

    Status: principle of the calibraton has already been tested.Sofware exists and has to be adapted. Schedule: first calibration at end of 2001.POSITIONNING & CONTROL TOOLS:

    The tools are now understood (4*6 positioning tools delivered + control towers). Many error sources are possible.Differential sag between tubes and wires has to be checked.Next X-tomo control end of april 2001 (4 masks delivered).

    Feuil1

    Numbers of spaces according to the distances between chambers

    ChambersA or C SectorsDistances between chambers (mm)

    17.518.118.318.618.818.91919.832.232.832.93350.5198.8343.3388.3452*489*1266,4*1302,4*

    BISStandard (x16)15

    BILStandard (x10)311

    BILS13 (x2)221

    BIMS11 or 15 (x4)41

    BIRS11 or 15 (x4)111111

    BMSStandard (x12)11111

    BMLStandard (x16)32

    BMFS12 or 14 (x4)11

    BOSStandard (x12)5

    BOLStandard (x12)41

    BOFS12 or 14 (x4)53

    Total (all sectors)108721232661298102444412212124444

    * For the big distances, only the axial alignment will be installed

    Feuil2

    Feuil3

  • Feuil1

    Numbers of spaces according to the distances between chambers

    ChambersA or C SectorsDistances between chambers (mm)

    17.518.118.318.618.818.91919.832.232.832.93350.5198.8343.3388.3452*489*1266,4*1302,4*

    BISStandard (x16)15

    BILStandard (x10)311

    BILS13 (x2)221

    BIMS11 or 15 (x4)41

    BIRS11 or 15 (x4)111111

    BMSStandard (x12)11111

    BMLStandard (x16)32

    BMFS12 or 14 (x4)11

    BOSStandard (x12)5

    BOLStandard (x12)41

    BOFS12 or 14 (x4)53

    Total (all sectors)108721232661298102444412212124444

    * For the big distances, only the axial alignment will be installed

    Feuil2

    Feuil3