The MOMFOS fiber positioner

Anna Marie Moore; Andrew J. McGrath

doi:10.1117/12.550294

30 September 2004 The MOMFOS fiber positioner

Anna Marie Moore, Andrew J. McGrath

Proceedings Volume 5492, Ground-based Instrumentation for Astronomy; (2004) https://doi.org/10.1117/12.550294
Event: SPIE Astronomical Telescopes + Instrumentation, 2004, Glasgow, United Kingdom

Abstract

The Anglo-Australian Observatory has undertaken a design study for a ≈1000 fibre positioner for the prime focus of the Giant Segmented Mirror Telescope (GSMT) as part of the MOMFOS (Multi-Object Multi-Fibre Optical Spectrograph) instrument. To our knowledge this is the first design study funded for a prime focus instrument for an ELT. It offers a particularly elegant and efficient solution for wide-field multiobject spectroscopy on extremely large telescopes (>30m) for the acquisition of large scale high-redshift surveys (12), density coverage (≈2.5 million galaxies) and limiting magnitude (R≤26.5). Closely based on the innovative Echidna positioner under construction for Subaru's FMOS system, the MOMFOS positioner uses piezoelectric microrobotic actuators able to position accurately all 1000 fibres simultaneously. The FMOS-Echidna design is extended to include a novel position feedback system offering radical benefits in cost and speed. We present positioning results for a design capable of a higher packing density than that developed for FMOS-Echidna, providing ≈1000 fibres across the 175 mm diameter field of view (20 arcmin).

Citation Download Citation

Anna Marie Moore and Andrew J. McGrath "The MOMFOS fiber positioner", Proc. SPIE 5492, Ground-based Instrumentation for Astronomy, (30 September 2004); https://doi.org/10.1117/12.550294

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