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Electronic speckle pattern interferometry at the SLHC

Electronic speckle pattern interferometry at the SLHC

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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