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Status Report on Michigan Group Tracker Alignment R&D

Status Report on Michigan Group Tracker Alignment R&D. Keith Riles , Jin Yamamoto, Haijun Yang University of Michigan ALCPG Tracking Group Session January 11, 2003. Goal: Carry out R&D toward a low-mass, real-time tracker alignment system with O(1 micron) precision. Why? Assumption:

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Status Report on Michigan Group Tracker Alignment R&D

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  1. Status Report on Michigan Group Tracker Alignment R&D Keith Riles, Jin Yamamoto, Haijun Yang University of Michigan ALCPG Tracking Group Session January 11, 2003 K. Riles - U. Michigan

  2. Goal: • Carry out R&D toward a low-mass, real-time tracker alignment system with O(1 micron) precision . Why? Assumption: Inner detector subject to thermal drifts on time scales too short to collect adequate control sample of tracks for determining alignment from data Conclusion: Need independent alignment system with rapid tracking of drifts  “Real time alignment” K. Riles - U. Michigan

  3. Two optical alignment schemes used in present / future experiments: • RASNIK system -- L3  CHORUS  CDF • Frequency Scanned Interferometer (FSI) – ATLAS • [A.F.~Fox-Murphy et al., Nuc. Inst. Meth. A383, 229 (1996)] • Focusing efforts here on FSI approach • Seems more promising for low-material tracker Basic idea: Measure hundreds of absolute point-to-point distances on tracker structure, using an interferometer “fanout” of optical fibers from a central laser. Laser frequency is scanned and fringes counted for each channel to determine absolute distances. Infer tracker distortions from fit. K. Riles - U. Michigan

  4. Status: • Requested funds in joint UCLC/LCRD proposal – waiting… • Former graduate student (Jin Yamamoto) has been spending part-time laying groundwork for acquiring equipment • Big-ticket item – Scannable laser • First choice: New Focus “Velocity” series (~630 nm) Tuning range: >3.5 THz (nominal f = 480 THz) • Cost: ~$20K • Infrared (~1.5 μm) laser with comparable range available for ~$10K – fallback option but visible light preferable K. Riles - U. Michigan

  5. Other components planned for first bench test: • Photodiode • Corner reflector • Optical fibers and couplers • Etalons (reference cavities) • Conceptual design: • Need straw man configuration of interferometer beams • Need simulation infrastructure for optimizing design • Seeking talented student to write simulation program K. Riles - U. Michigan

  6. Summary Poised to order laser (and wavelength-dependent components) – awaiting signal of funding likelihood: In parallel will develop simulation tools to optimize design Would love to know funding situation better… K. Riles - U. Michigan

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