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Proceedings Paper

AAOmega: a multipurpose fiber-fed spectrograph for the AAT
Author(s): Greg A. Smith; Will Saunders; Terry Bridges; Vladimir Churilov; Allan Lankshear; John Dawson; David Correll; Lew Waller; Roger Haynes; Gabriella Frost
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Paper Abstract

The AAOmega project replaces the two 2dF spectrographs, which are mounted on the top end of the Anglo Australian Telescope, with a bench mounted double beam spectrograph covering 370 to 950nm. The 2dF positioner, field plate tumbler mechanism, and fiber retractors will be retained. The new spectrograph will be fed by 392 fibers from either of the two 2dF field plates, or by the 512 fiber Spiral integral field unit, located at the Cassegrain focus. New instrument control electronics has also been designed to drive the spectrograph. Stability will be improved by locating the spectrograph off the telescope, but the 2df fibers must be extended to thirty-eight metres length. Despite this, using fibers with improved characteristics, increased pupil diameter, volume phase holographic (VPH) gratings with articulated cameras, and more efficient coatings on optics we achieve a minimum twofold increase in throughput. We will also fit larger (4k x 2k pixel) detectors. The spectrograph comprises: a F/3.15 Schmidt collimator, incorporating a dichroic beamsplitter; interchangeable VPH gratings; and articulating red and blue F/1.3 Schmidt cameras. The beamsplitter may be exchanged with others which cut off at different wavelengths. A full suite of VPH gratings are provided to cover resolution to 8000.

Paper Details

Date Published: 30 September 2004
PDF: 11 pages
Proc. SPIE 5492, Ground-based Instrumentation for Astronomy, (30 September 2004); doi: 10.1117/12.551013
Show Author Affiliations
Greg A. Smith, Anglo-Australian Observatory (Australia)
Will Saunders, Anglo-Australian Observatory (Australia)
Terry Bridges, Anglo-Australian Observatory (Australia)
Vladimir Churilov, Anglo-Australian Observatory (Australia)
Allan Lankshear, Anglo-Australian Observatory (Australia)
John Dawson, Anglo-Australian Observatory (Australia)
David Correll, Anglo-Australian Observatory (Australia)
Lew Waller, Anglo-Australian Observatory (Australia)
Roger Haynes, Anglo-Australian Observatory (Australia)
Gabriella Frost, Anglo-Australian Observatory (Australia)

Published in SPIE Proceedings Vol. 5492:
Ground-based Instrumentation for Astronomy
Alan F. M. Moorwood; Masanori Iye, Editor(s)

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