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Proceedings Paper

Postupgrade performance of the 3.8-m United Kingdom Infrared Telescope (UKIRT)
Author(s): Timothy G. Hawarden; Nicholas P. Rees; Timothy C. Chuter; Antonio C. Chrysostomou; Charles P. Cavedoni; Ralf-Rainer Rohloff; Eckhart Pitz; Donald G. Pettie; Richard J. Bennett; Eli Ettedgui-Atad
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Paper Abstract

The upgraded 3.8 m UK Infrared Telescope is now provided with: (1) tip-tilt image stabilization by a light-weighted secondary mirror on piezo-electric actuators, controlled by a fast guider sampling at >= 40 Hz on guide stars V m6; (2) active primary mirror figure and secondary mirror alignment control, via a regularly-maintained look-up table; (3) active focus measurements and correction by the fast guider, supplementing a focus maintenance model which corrects for elastic and thermal changes; (4) ventilation of the 2600 m3 dome by 16 apertures totalling 50 m2; (5) insulation of the underside of the concrete dome floor; and (6) internal air circulation during the day, to reduce heating of the upper telescope steelwork.

Paper Details

Date Published: 29 October 1999
PDF: 12 pages
Proc. SPIE 3785, Advanced Telescope Design, Fabrication, and Control, (29 October 1999); doi: 10.1117/12.367622
Show Author Affiliations
Timothy G. Hawarden, Joint Astronomy Ctr. (United Kingdom)
Nicholas P. Rees, Joint Astronomy Ctr. (United States)
Timothy C. Chuter, Joint Astronomy Ctr. (United States)
Antonio C. Chrysostomou, Joint Astronomy Ctr. (United Kingdom)
Charles P. Cavedoni, Gemini Telescopes (United States)
Ralf-Rainer Rohloff, Max-Planck-Institut fuer Astronomie (Germany)
Eckhart Pitz, Max-Planck-Institut fuer Astronomie (Germany)
Donald G. Pettie, Royal Observatory Edinburgh (United Kingdom)
Richard J. Bennett, Royal Observatory Edinburgh (United Kingdom)
Eli Ettedgui-Atad, Royal Observatory Edinburgh (United Kingdom)

Published in SPIE Proceedings Vol. 3785:
Advanced Telescope Design, Fabrication, and Control
William Roybal, Editor(s)

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