Design and performance of an R-θ fiber positioner for the BigBOSS instrument
2012
The BigBOSS instrument is a proposed multi-object spectrograph for the Mayall 4m telescope at Kitt Peak, which will
measure the redshift of 20 million galaxies and map the expansion history of the universe over the past 8 billion years,
surveying 10-20 times the volume of existing studies. For each 20 minute observation, 5000 optical fibers are
individually positioned by a close-packed array of 5000 robotic positioner mechanisms. Key mechanical constraints on
the positioners are: o12mm hardware envelope, o14mm overlapping patrol zones, open-loop targeting accuracy ≤ 40μm,
and step resolution ≤ 5μm, among other requirements on envelope, power, stability, and speed. This paper describes the
design and performance of a newly-developed fiber positioner with R-θ polar kinematics, in which a flexure-based linear
R-axis is stacked on a rotational θ-axis. Benefits over the usual eccentric parallel axis θ-φ kinematic approach include
faster repositioning, simplified anti-collision schemes, and inherent anti-backlash preload. Performance results are given
for complete positioner assemblies as well as sub-component hardware characterization.
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