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Proceedings Paper

The WEAVE focus translation system: from design to construction
Author(s): Manuel Canchado; Antonio Romero; Óscar Maroto; Albert Tomàs; Carlos Martín-Nuño; Joan Manel Casalta; Joaquín Prida; J. Alfonso L. Aguerri; José Miguel Herreros; José Miguel Delgado; José Alonso Burgal; Don Carlos Abrams; Kevin Dee; Gavin Dalton; Piercarlo Bonifacio; Scott C. Trager; Antonella Vallenari
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Paper Abstract

WEAVE is a new wide-field spectroscopy facility proposed for the prime focus of the 4.2m William Herschel Telescope (WHT), placed in La Palma, Canary Islands, Spain.

To allow for the compensation of the effects of temperature-induced and gravity-induced image degradation, the WEAVE prime focus assembly will be translated along the telescope optical axis. The assembly comprises the prime focus corrector with integrated ADC, a central mount for the corrector, an instrument rotator and a twin-focal-plane fibre positioner. Translation is accomplished through the use of a set of purpose-built actuators; collectively referred to as the Focus Translation System (FTS), formed by four independently-controlled Focus Translation Units (FTUs), eight vanes connecting the FTUs to a central can, and a central can hosting WEAVE Instrument. Each FTU is capable of providing a maximum stroke of ±4mm with sufficient, combined force to move the five-tonne assembly with a positional accuracy of ±20μm at a resolution of 5μm. The coordinated movement of the four FTUs allows ±3mm WEAVE focus adjustment in the optical axis and ±0.015° tilt correction in one axis. The control of the FTS is accomplished through a PLC-based subsystem that receives positional demands from the higher-level Instrument Control System.

SENER has been responsible for designing, manufacturing and testing the FTS and the equipment required to manipulate and store the FTS together with the instrument.

This manuscript describes the final design of the FTS along with the analyses and simulations that were performed, discusses the manufacturing procedures and the results of early verification prior to integration with the telescope. The plans for mounting the whole system on the telescope are also discussed.

Paper Details

Date Published: 22 July 2016
PDF: 15 pages
Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 99126D (22 July 2016); doi: 10.1117/12.2232985
Show Author Affiliations
Manuel Canchado, SENER Ingeniería y Sistemas (Spain)
Antonio Romero, SENER Ingeniería y Sistemas (Spain)
Óscar Maroto, SENER Ingeniería y Sistemas (Spain)
Albert Tomàs, SENER Ingeniería y Sistemas (Spain)
Carlos Martín-Nuño, SENER Ingeniería y Sistemas (Spain)
Joan Manel Casalta, SENER Ingeniería y Sistemas (Spain)
Joaquín Prida, SENER Ingeniería y Sistemas (Spain)
J. Alfonso L. Aguerri, Instituto de Astrofísica de Canarias (Spain)
José Miguel Herreros, Instituto de Astrofísica de Canarias (Spain)
José Miguel Delgado, Instituto de Astrofísica de Canarias (Spain)
José Alonso Burgal, Instituto de Astrofísica de Canarias (Spain)
Don Carlos Abrams, Isaac Newton Group of Telescopes (Spain)
Kevin Dee, Isaac Newton Group of Telescopes (Spain)
Gavin Dalton, Univ. of Oxford (United Kingdom)
Piercarlo Bonifacio, GEPI, Observatoire de Paris à Meudon (France)
Scott C. Trager, Kapteyn Institute (Netherlands)
Antonella Vallenari, INAF - Osservatorio Astronomico di Padova (Italy)

Published in SPIE Proceedings Vol. 9912:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II
Ramón Navarro; James H. Burge, Editor(s)

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