8-13 August 2011
Rhode Island Convention Center
US/Eastern timezone

Frequency Scanned Interferometry for ILC Tracker Alignment

10 Aug 2011, 18:05
556 (Rhode Island Convention Center)


Rhode Island Convention Center

Parallel contribution Detector Technology and R&D Detector Technology and R&D


Dr Haijun Yang (University of Michigan)


In order to exploit fully the physics potential of future lepton colliders, highly precise tracking systems will be needed, for which systematic alignment uncertainties must be small. We describe ongoing R&D in frequency scanned interferometry (FSI) to be applied to alignment monitoring of a detector's charged particle tracking system, in addition to its beam pipe and final-focus quadrupole magnets. In FSI alignment, one measures hundreds of absolute point-to-point distances of detector elements in 3 dimensions by using an array of beams split from a central laser. We report here on progress using a dual-laser FSI single-channel prototype. Dual lasers with oppositely scanned frequency directions permit cancellation of many systematic errors, making the alignment robust against vibrations and environmental disturbances. Under realistic environmental conditions, a precision of about 0.2 microns was achieved for a distance of about 40 cm for the prototype. Work is now under way to demonstrate a multi-channel system on the bench. Recent progress will be summarized.

Primary author

Dr Haijun Yang (University of Michigan)


Prof. Keith Riles (University of Michigan) Mr Tianxiang Chen (University of Michigan)

Presentation Materials