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Metrology and Stabilisation WP7

Metrology and Stabilisation WP7. Y.Karyotakis Annecy-Le-Vieux (LAPP) November 1 st , 2004. Purpose. Survey and alignment Stabilisation Site characterisation. Overview. Relevance for the LC Survey and Alignment :

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Metrology and Stabilisation WP7

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  1. Metrology and StabilisationWP7 Y.Karyotakis Annecy-Le-Vieux (LAPP) November 1st, 2004

  2. Purpose • Survey and alignment • Stabilisation • Site characterisation WP7

  3. Overview • Relevance for the LC • Survey and Alignment: • First use in tunnel construction, determine settling, place component foundations • Second use in component placement • Continuous use during operation to track drifts, settling, component changes and other position related problems • Stabilisation • First impact in choice of site. How much vibration can we suppress with active and passive measures? • How many feedback systems do we need and how do they interact? • Influence on FF magnet design (vibration modes and sources) • FF stability is critical for luminosity stabilisation • Accurate FF placement reduces time from beam on to max luminosity, especially after detectors are opened and closed WP7

  4. Tasks • RTRS • Fast reliable accurate survey techniques • Components’ location monitoring • MSTBT • Active stabilisation • PGMS • Vibration spectra @ potential LC sites WP7

  5. Institutes • UOXF.DLRTRS / MSTBT • LAPP MSTBT • CCLRC PGMS • DESY PGMS WP7

  6. MSTBT goals Mechanical stabilise critical components • Inertial and optical sensors • Actuators (Piezo, electrostatic,….) • Fast feedback Loop • Modeling (FE and dynamic analysis. Full simulation of the process) • Mockup demonstrator WP7

  7. MSTBT work share • Oxford • Optical sensor development (M-FSI = Michelson interferometry combined with FSI) with nm resolution • Fast, cost effective custom readout and DAQ • Push frequency reach of sensors up to O(10 kHz) by multi fibre phase measurement technique • LAPP • Inertial sensors survey and development (~1-300Hz) • Actuators • Feedback loop • Mechanical modeling • Mockup simulation and construction WP7

  8. MSTBT deliverables • Full modeling of the process • Build a prototype of 3-DOF stabilisation unit based on M-FSI technology and test with various actuators. • Build a mockup of a FF magnet, measure vibrations, compare with model, stabilise it Should take ~ 2 years WP7

  9. RTRS goals • Provide Metrology and Alignment process for the complete collider (3-step process) • Step 1: Rapidly perform collider reference survey with maximal automation (Metrology, RTRS=Rapid Tunnel Reference Surveyor) • Step 2: Survey collider components against reference (automated stake-out instrument(s)) • Step 3: Adjust collider geometry allowing save insertion of beams (Alignment, manual in main linac, possibly automated for very sensitive elements) • Provide rapid, accurate measure of geometry at any time with minimal reduction of up-time (Diagnostic function) WP7

  10. LiCAS Principle Internal FSI System Dz. & Dx,Dy & Da,Db between cars Extrenal FSI System measures Wall marker location Straightness Monitor Dx,Dy & Da,Db between cars WP7

  11. RTRS (2) • Oxford & DESY Applied Geodesy group • Develop complete sensing system for RTRS based on • FSI: Frequency Scanning Interferometry for absolute distance measurements • LSM: Laser Straightness Monitors WP7

  12. RTRS deliverables • Build a 3-car prototype RTRS, operate in DESY test tunnel by middle 2006 • Aim to be usable in X-FEL • Develop automatic stake out instrument WP7

  13. PGMS • Natural Cultural noise • Site dependence • Develop reliable nm measurement techniques over large domain of frequencies DESY and CCLRC WP7

  14. Conclusion • Stabilisation is a new dimension to take into account for a Linear Collider • Need to develop fast and reliable alignment techniques • Important contribution from participating institutes and EU • Solid R&D program over the next 3 years WP7

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