Focus and translation mechanism for the Gemini Multiobject Spectrograph (GMOS)

Details Focus and translation mechanism for the Gemini Multiobject Spectrograph (GMOS) Focus and translation mechanism for the Gemini Multiobject Spectrograph (GMOS)

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997spie.2871.1216h&link_type=abstract

Proc. SPIE Vol. 2871, p. 1216-1221, Optical Telescopes of Today and Tomorrow, Arne L. Ardeberg; Ed.

Physics

Scientific paper

GMOS is the general-purpose optical spectrograph for the Gemini telescope. It is to be mounted at the Cassegrain focus and has been designed from the outset to have open-loop active correction for the effects of instrumental flexure. This is done by moving the CCD detector mosaic in two axes to counter the image drift due to flexure. GMOS is also focused by moving the detector and the three axis mechanism to achieve these motions is described here. The mechanism also provides the necessary thermal isolation for the cooled CCD and is driven by stepping motors outside the CCD vacuum vessel.

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