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Proceedings Paper

The Gemini-North multi-object spectrograph stability performance
Author(s): Richard G. Murowinski; Jeremy R. Allington-Smith; Steven M. Beard; David Crampton; Roger Llewelyn Davies; Colin G. Dickson; Isobel Hook; Inger Jorgensen; S. Juneau; G. Ewan Marshall; Kei Szeto; Chris Tierney
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Paper Abstract

Of the Gemini Multi-Object Spectrograph's (GMOS) scientific requirements, one which led to technically interesting areas was the ability to measure velocities to an accuracy of 2km/s over the entire 5.5 arcminute square field. GMOS's design to meet this requirement includes a mechanical design for stiffness and without hysteresis or image rotation, and an open loop flexure control system which translates the detector position to compensate for flexure. The model used to predict the flexure is an empirical one developed from measured flexure results. In this paper we present the analysis of factors which enable meeting the 2km/s requirement, and the observing strategies needed to make those observations. We look in particular detail at the development and test of that flexure compensation system, including both lab results and on-telescope results.

Paper Details

Date Published: 7 March 2003
PDF: 12 pages
Proc. SPIE 4841, Instrument Design and Performance for Optical/Infrared Ground-based Telescopes, (7 March 2003); doi: 10.1117/12.461744
Show Author Affiliations
Richard G. Murowinski, NRC-Herzberg Institute of Astrophysics (Canada)
Jeremy R. Allington-Smith, Univ. of Durham (United Kingdom)
Steven M. Beard, UK Astronomy Technology Ctr./Royal Observatory Edinburgh (United Kingdom)
David Crampton, NRC-Herzberg Institute of Astrophysics (Canada)
Roger Llewelyn Davies, Univ. of Durham (United Kingdom)
Colin G. Dickson, UK Astronomy Technology Ctr./Royal Observatory Edinburgh (United Kingdom)
Isobel Hook, Univ. of Oxford (United Kingdom)
Inger Jorgensen, Gemini Observatory (United States)
S. Juneau, NRC-Herzberg Institute of Astrophysics (Canada)
G. Ewan Marshall, UK Astronomy Technology Ctr./Royal Observatory Edinburgh (United Kingdom)
Kei Szeto, NRC-Herzberg Institute of Astrophysics (Canada)
Chris Tierney, UK Astronomy Technology Ctr./Royal Observatory Edinburgh (United Kingdom)


Published in SPIE Proceedings Vol. 4841:
Instrument Design and Performance for Optical/Infrared Ground-based Telescopes
Masanori Iye; Alan F. M. Moorwood, Editor(s)

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