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Electronic speckle pattern interferometry at the SLHC

Electronic speckle pattern interferometry at the SLHC. Overview. What is the SLHC? How is Oxford involved? Electronic Speckle Pattern Interferometry (ESPI) What is it? How does it work? How are we using it?. S uper LHC. ATLAS upgrade required Radiation damage ~10 years

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Electronic speckle pattern interferometry at the SLHC

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  1. Electronic speckle pattern interferometry at the SLHC Robert King, Oxford University - Graduate Seminar Series

  2. Overview • What is the SLHC? • How is Oxford involved? • Electronic Speckle Pattern Interferometry (ESPI) • What is it? • How does it work? • How are we using it? Robert King, Oxford University - Graduate Seminar Series

  3. SuperLHC • ATLAS upgrade required • Radiation damage ~10 years • Higher luminosity of SLHC • ATLAS built for <700 fb-1 • SLHC must cope with >3000fb-1 → New central tracker Robert King, Oxford University - Graduate Seminar Series

  4. Carbon honeycomb or foam Silicon sensors Carbon fiber facing Bus cable Coolant tube structure Hybrids Readout IC’s The ‘stave’ • Detectors mounted on carbon fiber staves • Low mass • Integrated cooling and services • Intrinsic mechanical stability Staves inter-leaved Robert King, Oxford University - Graduate Seminar Series

  5. Where does ESPI come in? • Accurate track resolution • Need thermo-mechanical stability to -25°C • ESPI can verify this • Sub-micron precision • Large area • Frequent sampling • Non-invasive • Oxford has experience Robert King, Oxford University - Graduate Seminar Series

  6. How ESPI Works (1) • An expanded laser beam on rough surface gives laser speckle • Interference caused by λ scale variations on surface Robert King, Oxford University - Graduate Seminar Series

  7. How ESPI Works (2) Robert King, Oxford University - Graduate Seminar Series

  8. How ESPI Works (3) → Intensity contours = displacement contours Robert King, Oxford University - Graduate Seminar Series

  9. How ESPI works (4) • Silicone diaphragm under pressure • Each ‘fringe’ ~ λ/2 displacement Robert King, Oxford University - Graduate Seminar Series

  10. The Oxford Setup • Sensitive to in-plane and out of plane motion • In-plane • Out-of-plane Robert King, Oxford University - Graduate Seminar Series

  11. Test Object Fibers Camera Fiber coupling Laser Robert King, Oxford University - Graduate Seminar Series

  12. In-plane deformation example Video made by Sam Whitehead Robert King, Oxford University - Graduate Seminar Series

  13. Summary • Integrated stave forms part of the SLHC upgrade • Validate thermo-mechanical stability • ESPI gives submicron accuracy over large areas • Testing on prototype staves should begin soon Images sourced from Daniel Buria-Clark’s Thesis Robert King, Oxford University - Graduate Seminar Series

  14. Backup slides • Out of plane measurement detail Robert King, Oxford University - Graduate Seminar Series

  15. In plane measurement detail Robert King, Oxford University - Graduate Seminar Series

  16. Speckle pattern formation Robert King, Oxford University - Graduate Seminar Series

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