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Geometrical Measurements of the TEC Elements Goals internal survey external survey LINK calibration Means 3D CMM Cosmics Geodesy Procedure Conclusions

Jan 02, 2016

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  • Geometrical Measurementsof the TEC Elements Goals internal survey external survey LINK calibration

    Means

    3D CMM Cosmics Geodesy

    Procedure

    ConclusionsA.Ostaptchouk, D.Pandoulas, S.Schael, R.SiedlingI. Physikalisches Institut, RWTH-AachenTalk presented by A.O. for the TK TPO meeting on 01.11.01

    CMS Tracker Review September 2001

  • Geometrical Measurements of the TEC Elements - Goals -Goals of the geometrical measurementsInternal survey: measurement of the TEC internal geometry

    External survey: measurement of positions of the TEC external fiducial marks w.r.t. the TEC internal coordinate frame

    LINK calibration: measurement of LINK element orientations

    CMS Tracker Review September 2001

  • Geometrical Measurements of the TEC Elements - Goals -Internal survey: measurement of TEC geometry for

    Quality Control (QC) of the TEC petals and discs

    Precise ( 50 m) measurement of module rcoordinates in petal coordinate frame to provide a starting point for alignment with tracks

    Less precise ( 100 m for r-coordinates, 500 m for z-coordinates) measurement of petals in the TEC coordinate system to provide the starting point for the TEC optical alignment system

    CMS Tracker Review September 2001

  • Geometrical Measurements of the TEC Elements - Goals -External survey: measurement of positions of the TEC external fiducial marks with

    100 m precision for fiducial mark r-coordinates, and 200 m precision for fiducial mark z-coordinates in the TEC coordinate system (for precise positioning of the TEC in the CMS coordinate frame)LINK calibration: measurement of LINK element orientations

    20 rad precision for tiltmeter -orientation w.r.t. gravity 100 rad precision for periscope - and -orientations in the TEC coordinate system

    CMS Tracker Review September 2001

  • Geometrical Measurements of the TEC Elements - Means -Means of the geometrical measurements 3D Coordinate Measuring Machine (CMM)

    Cosmic Rays

    Geodesy

    CMS Tracker Review September 2001

  • Geometrical Measurements of the TEC Elements - Clean Room - Parameters of Aachen clean room

    Class 100 000 Temperature control: 1 oC Humidity control: 10%

    CMS Tracker Review September 2001

  • Geometrical Measurements of the TEC Elements - 3D CMM - 3D Coordinate Measuring Machine Type Wenzel RS-1618 Dynamic range 2500 1600 1800 mm3 Precision 20 + (L/50 mm) m 70 m Sensitive elements mechanical feeler or video camera

    CMS Tracker Review September 2001

  • Geometrical Measurements of the TEC Elements - Cosmics Stand - Cosmics test-stand

    Triggered area 2200 2200 mm2 Trigger granularity (10 X-counters) (10 Y-counters) -energy threshold 200 MeV (16cm steel)

    CMS Tracker Review September 2001

  • Geometrical Measurements of the TEC Elements - Geodesy - CERN survey group (Ch. Lasseur) provides different geodesic measurements, e.g. photogrammetry:

    Dynamic range several meters

    Resolution 50 - 100 m

    CMS Tracker Review September 2001

  • Geometrical Measurements of the TEC Elements - Internal Survey - Instruments:

    Survey of support structures 3D CMM

    Measurement of module positions Cosmics Targets for support structure measurements:

    Petals module inserts, petal mounts

    Discs petal inserts, reference spheres TECs reference spheres of the TEC discs Objectives of cosmics measurements:

    Module positions verification of the CMM survey

    System test one tower (1/16 TEC) read-out Optical alignment calibration: zero for installation

    CMS Tracker Review September 2001

  • Geometrical Measurements of the TEC Elements - Survey of Petals - Procedure of petal survey:

    Petal position vertical

    Petal coordinate frame defined by 3 petal mounts Module insert positions in the petal coordinate frame Petal mountsModule inserts

    CMS Tracker Review September 2001

  • Geometrical Measurements of the TEC Elements - Survey of Discs - Procedure of disc survey:

    Disc position vertical or horisontal

    Number of runs two overlapping runs

    Disc coordinate frame defined by 3 reference spheres Petal insert positions in the disc coordinate frame Reference spheresPetal inserts

    CMS Tracker Review September 2001

  • Geometrical Measurements of the TEC Elements - Survey of TECs - Procedure of TEC survey:

    TEC position vertical or horisontal

    Number of runs two or three overlapping runs

    TEC coordinate frame defined by reference disc (e.g. #5) Disc positions in the TEC coordinate frame Reference spheres

    CMS Tracker Review September 2001

  • Geometrical Measurements of the TEC Elements - Cosmics Stand - One tower (1/16 TEC) characteristics:

    Number of petals 9

    Number of modules ~ 300

    Number of FEDs 5-6 Cosmics rate ~ .5 Hz To fulfill the goals of measurements with cosmic rays

    measurement of the Si-odule positions

    system test of the TEC calibration of the optical alignment

    the minimal subsystem which has to be fully operational on the cosmic stand is one tower

    CMS Tracker Review September 2001

  • Geometrical Measurements of the TEC Elements - External Survey - Procedure has to be elaborated in a contact with the CMS survey group (Ch. Lasseur):

    Number of external fiducials

    Placement of the fiducials

    Measurement program Goal of the external survey:

    precise measurement of the TEC external fiducials in the TEC coordinate system for precise positioning of the TEC in the CMS coordinate frame Instruments:

    3D CMM

    photogrammetry

    CMS Tracker Review September 2001

  • Geometrical Measurements of the TEC Elements - LINK Calibration -LINK elements to calibrate:

    periscopes: 100 rad precision for - and - orientations in the TEC coordinate system

    tiltmeters: 20 rad precision for -orientation w.r.t. gravity LINK Systemtiltmetersperiscopes

    CMS Tracker Review September 2001

  • Geometrical Measurements of the TEC Elements - Periscope Calibration -Periscope calibration:

    measurement of the sensor positions w.r.t. back-disc coordinate system using CMM or photogrammetry

    measurement of the laser spot positions in senor coordinate system

    CMS Tracker Review September 2001

  • Geometrical Measurements of the TEC Elements - Tiltmeter Calibration -Tiltmeter calibration:

    measurement of the back-disc reference incerts w.r.t. gravity using CMM or geodesy

    registration of the tiltmeters readings

    CMS Tracker Review September 2001

  • Geometrical Measurements of the TEC Elements - Conclusions -Geometrical measurements of the TECs

    provide necessary quality control of the TEC parts

    give a good starting point for both optical and track alignment

    make possible precise positioning of the TECs in the CMS coordinate frame

    allow calibration of LINK system elements The measurement tools are

    3D Coordinate Measuring Machine

    Cosmic rays stand

    Photogrammetry

    The measurement procedures have to be developed and tested in contact with the CMS survey group

    CMS Tracker Review September 2001

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