Physics – Optics
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21933511s&link_type=abstract
American Astronomical Society, AAS Meeting #219, #335.11
Physics
Optics
Scientific paper
The BigBOSS instrument is a proposed fiber-fed spectrograph for the Mayall 4 m telescope at Kitt Peak, Arizona, 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. The focal plate of the new telescope's prime focus optics will be populated with 5,000 robotic fiber positioners, each targeting and tracking an individual galaxy with every single exposure. The center-to-center pitch between positioners is 12 mm. For complete areal coverage of the focal plane, positioners must patrol overlapping zones of at least diameter 14 mm. Strict light throughput requirements demand lateral and defocus errors of the positioners not to exceed ±15 μm, with a maximum tilt error of 0.15° at the fiber tip. In our poster, we present the design, and performance of a newly developed fiber positioner with R-θ kinematics, in which a flexure-based linear R-axis is stacked on a rotational θ-axis. Benefits over the established parallel axis θ-θ approach (e.g. Lamost, Cobra) include larger patrol area, simplified anti-collision schemes for repositioning, and reduced assembly tolerance chain. Results from sub-component hardware characterization are also presented, defining positioner specifications suitable to meet science requirements and technical feasibility.
Cepeda M. D.
Post R. L.
Schenk C.
Silber Joseph H.
Zhou Zheng-Wei
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