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Proceedings Paper

Design and performance of an R-theta fiber positioner for the BigBOSS instrument
Author(s): Joseph H. Silber; Christoph Schenk; Eric Anderssen; Chris Bebek; Frederic Becker; Robert Besuner; Mario Cepeda; Jerry Edelstein; Henry Heetderks; Patrick Jelinsky; Thomas Johnson; Armin Karcher; Paul Perry; Rodney Post; Michael Sholl; Kenneth Wilson; Zengxaing Zhou
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Paper Abstract

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: ø12mm hardware envelope, ø14mm 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.

Paper Details

Date Published: 13 September 2012
PDF: 13 pages
Proc. SPIE 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II, 845038 (13 September 2012); doi: 10.1117/12.926457
Show Author Affiliations
Joseph H. Silber, Lawrence Berkeley National Lab. (United States)
Christoph Schenk, Lawrence Berkeley National Lab. (United States)
Eric Anderssen, Lawrence Berkeley National Lab. (United States)
Chris Bebek, Lawrence Berkeley National Lab. (United States)
Frederic Becker, Lawrence Berkeley National Lab. (United States)
Robert Besuner, Space Sciences Lab., Univ. of California, Berkeley (United States)
Mario Cepeda, Lawrence Berkeley National Lab. (United States)
Jerry Edelstein, Space Sciences Lab., Univ. of California, Berkeley (United States)
Henry Heetderks, Space Sciences Lab., Univ. of California, Berkeley (United States)
Patrick Jelinsky, Lawrence Berkeley National Lab. (United States)
Thomas Johnson, Lawrence Berkeley National Lab. (United States)
Armin Karcher, Lawrence Berkeley National Lab. (United States)
Paul Perry, Lawrence Berkeley National Lab. (United States)
Rodney Post, Lawrence Berkeley National Lab. (United States)
Michael Sholl, Space Sciences Lab., Univ. of California, Berkeley (United States)
Kenneth Wilson, Lawrence Berkeley National Lab. (United States)
Zengxaing Zhou, Lawrence Berkeley National Lab. (United States)


Published in SPIE Proceedings Vol. 8450:
Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II
Ramón Navarro; Colin R. Cunningham; Eric Prieto, Editor(s)

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