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Status Report on Michigan Group Tracker Alignment R&D

This report outlines the progress and goals of the University of Michigan's Group Tracker Alignment R&D led by Keith Riles, Jin Yamamoto, and Haijun Yang. The project aims to develop a low-mass, real-time tracker alignment system capable of achieving O(1 micron) precision. Given the inner detector's susceptibility to thermal drifts, an independent system for rapid drift tracking is essential. The report compares two optical alignment techniques: the RASNIK system and the Frequency Scanned Interferometer (FSI), with a focus on the FSI approach. Funding status and equipment acquisition steps are also discussed.

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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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