ALCPG Tracking Session 1/11/03 K. Riles - U. Michigan1 Status Report on Michigan Group Tracker Alignment R&D Keith Riles, Jin Yamamoto, Haijun Yang University.

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Presentation transcript:

ALCPG Tracking Session 1/11/03 K. Riles - U. Michigan1 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

ALCPG Tracking Session 1/11/03 K. Riles - U. Michigan2. 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” Goal: Carry out R&D toward a low-mass, real-time tracker alignment system with O(1 micron) precision

ALCPG Tracking Session 1/11/03 K. Riles - U. Michigan3 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.

ALCPG Tracking Session 1/11/03 K. Riles - U. Michigan4 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

ALCPG Tracking Session 1/11/03 K. Riles - U. Michigan5 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

ALCPG Tracking Session 1/11/03 K. Riles - U. Michigan6 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…