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Proceedings Paper

The mechanical design for the WEAVE prime focus corrector system
Author(s): Don Carlos Abrams; Kevin Dee; Tibor Agócs; Emilie Lhome; José Peñate; Attila Jaskó; Evelin Bányai; José Alonso Burgal; Gavin Dalton; Kevin Middleton; Piercarlo Bonifacio; J. Alfonso L. Aguerri; S. C. Trager; Marc Balcells
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Paper Abstract

WEAVE is the next-generation, wide-field, optical spectroscopy facility for the William Herschel Telescope (WHT) in La Palma, Canary Islands, Spain. The WHT will undergo a significant adaptation to accommodate this facility. A two- degree Prime Focus Corrector (PFC), that includes an Atmospheric Dispersion Compensator, is being planned and is currently in its final design phase. To compensate for the effects of temperature-induced image degradation, the entire PFC system will be translated along the telescope optical axis. The optical system comprises six lenses, the largest of which will have a diameter of 1.1m. Now that the optical elements are in production, the designs for the lens cells and the mounting arrangements are being analysed to ensure that the image quality of the complete system is better than 1.0 arcsec (80% encircled energy diameter) over the full field of view. The new PFC system is designed to be routinely interchanged with the existing top-end ring. This will maximise the versatility of the WHT and allow the two top-end systems to be interchanged as dictated by the scientific needs of the astronomers that will use WEAVE and other instruments on the telescope. This manuscript describes the work that has been carried out in developing the designs for the mechanical subsystems and the plans for mounting the lenses to attain an optical performance that is commensurate with the requirements derived from planning the WEAVE surveys.

Paper Details

Date Published: 28 July 2014
PDF: 18 pages
Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 91472K (28 July 2014); doi: 10.1117/12.2055894
Show Author Affiliations
Don Carlos Abrams, Isaac Newton Group of Telescopes (Spain)
Kevin Dee, Isaac Newton Group of Telescopes (Spain)
Tibor Agócs, NOVA ASTRON (Netherlands)
Emilie Lhome, Isaac Newton Group of Telescopes (Spain)
José Peñate, Instituto de Astrofísica de Canarias (Spain)
Attila Jaskó, MTA Research Ctr. for Astronomy and Earth Sciences (Hungary)
Evelin Bányai, MTA Research Ctr. for Astronomy and Earth Sciences (Hungary)
José Alonso Burgal, Instituto de Astrofísica de Canarias (Spain)
Gavin Dalton, STFC Rutherford Appleton Lab. (United Kingdom)
Univ. of Oxford (United Kingdom)
Kevin Middleton, STFC Rutherford Appleton Lab. (United Kingdom)
Piercarlo Bonifacio, GEPI, Observatoire de Paris à Meudon (France)
J. Alfonso L. Aguerri, Instituto de Astrofísica de Canarias (Spain)
S. C. Trager, Univ. of Groningen (Netherlands)
Marc Balcells, Isaac Newton Group of Telescopes (Spain)


Published in SPIE Proceedings Vol. 9147:
Ground-based and Airborne Instrumentation for Astronomy V
Suzanne K. Ramsay; Ian S. McLean; Hideki Takami, Editor(s)

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