The BigBOSS Multi-Object Spectrograph on the Mayall Telescope: Guide, Focus and Alignment Sensor System

Details The BigBOSS Multi-Object Spectrograph on the Mayall Telescope: Guide, Focus and Alignment Sensor System The BigBOSS Multi-Object Spectrograph on the Mayall Telescope: Guide, Focus and Alignment Sensor System

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21944001r&link_type=abstract

American Astronomical Society, AAS Meeting #219, #440.01

Astronomy and Astrophysics

Astronomy

Scientific paper

The BigBOSS experiment is proposed as a Stage IV dark energy survey. By measuring the spectroscopic redshift of 20 million galaxies baryon acoustic oscillation (BAO) effects in the local universe will be measured. The instrument will consist of 5000, remotely actuated optical fibers that transport light from the focal plane to a collection of spectrographs. For every exposure all 5000 fibers will moved to the focal location of a target within their range, typically a luminous red galaxy (z<1.0) or bright emmision line galaxy (z<1.7).
The combination of 120 micron (1.44") diameter fibers with 0.8" seeing and many optical and mechanical tolerances leaves little margin in preventing loss of light. BIGBOSS is therefore required to not only hold the telescope steady on the same sky location but also to orient the telescope and fibers so that pointing is *absolutely* correct on the sky. This will require excellent stellar astrometry for guiding, precise galactic astrometry, accurate fiber positioning, pinpoint focus, detailed pointing determination, and smooth tracking by the almost 40 year old telescope.
A preliminary design of the focus and alignment system for BigBOSS will be presented.

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