Prototyping results for a wide-field fibre positioner for the Giant Segmented Mirror Telescope

Anna Moore, Andrew McGrath

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Given the physical size of the GSMT prime focus field is approximately equivalent to that of the Subaru telescope it is possible to directly apply current technology developed for the Fiber Multi-Object Spectrograph instrument (FMOS, to be commissioned in 2005) and substantially reduce the risk associated with developing a new solution for wide-field multi-object spectroscopy on an ELT. The Anglo-Australian Observatory has recently completed a design study for an ∼1000 fibre, Echidna-style positioner for the prime focus of the Giant Segmented Mirror Telescope (GSMT). The positioner forms part of the wide-field Multi-Object Multi-Fiber Optical Spectrograph (MOMFOS), an ELT prime focus instrument offering a minimum of 800 fibres patrolling the corrected 20 arcmin field. The design study identified 2 components of an equivalent MOMFOS positioner design that required prototyping. Firstly, a higher spine packing density is required to satisfy the proposed scientific program. Secondly, the fibre position measurement system adopted for FMOS cannot be simply scaled and applied to MOMFOS given space constraints in the top end unit. As such a new and, if possible, simpler system was required. Prototyping results for both components are presented.

Original languageEnglish
Title of host publicationSecond Backaskog Workshop on Extremely Large Telescopes
EditorsArne Ardeberg, Torben Andersen
Number of pages8
Publication statusPublished - 2004
Externally publishedYes
EventSecond Backaskog Workshop on Extremely Large Telescopes - Backaskog Castle, Sweden
Duration: 9 Sept 200311 Sept 2003

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


ConferenceSecond Backaskog Workshop on Extremely Large Telescopes
CityBackaskog Castle


  • ELT
  • Fibre positioner
  • Piezoelectric actuator


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