The 4MOST secondary guider imaging system

Samuel C. Barden; Roland Winkler; Max Funck; Swara Rahurkar; Andreas Kelz; Nicolas Azais; Ulrike Lemke; Thomas Liebner; Svend Bauer

doi:10.1117/12.2562381

13 December 2020 The 4MOST secondary guider imaging system

Samuel C. Barden, Roland Winkler, Max Funck, Swara Rahurkar, Andreas Kelz, Nicolas Azais, Ulrike Lemke, Thomas Liebner, Svend Bauer

Author Affiliations +

Proceedings Volume 11447, Ground-based and Airborne Instrumentation for Astronomy VIII; 114478Q (2020) https://doi.org/10.1117/12.2562381
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

The 4-meter Multi-Object Spectroscopic Telescope (4MOST), wide-field, high-multiplex spectroscopic survey facility will enable the simultaneous spectroscopy of up to 2400 targets within a 2.5° diameter field of view. A secondary guider system optical relay and data production description is described. The role of this guider is for fine rotational and target alignment corrections. The output of the 12 times 7 fibres are arranged such that the CCD detector can be read out in continuous read mode. The position of all fibres are illuminated at their spectrograph end and measured using a camera system at the positioner end. For the secondary guide bundles, only the central fibre is illuminated. A notch filter is used in the image relay in such a way that that the back illumination light is reflected from back illumination fibres to illuminate only the central fibres of each guide probe. This allows on-sky guiding while the fibres are being positioned.

Citation Download Citation

Samuel C. Barden, Roland Winkler, Max Funck, Swara Rahurkar, Andreas Kelz, Nicolas Azais, Ulrike Lemke, Thomas Liebner, and Svend Bauer "The 4MOST secondary guider imaging system", Proc. SPIE 11447, Ground-based and Airborne Instrumentation for Astronomy VIII, 114478Q (13 December 2020); https://doi.org/10.1117/12.2562381

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