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Proceedings Paper

New telescope designs suitable for massively multiplexed spectroscopy
Author(s): Luca Pasquini; B. Delabre; R. Ellis; Tim de Zeeuw
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Paper Abstract

We present two novel designs for a telescope suitable for massively-multiplexed spectroscopy. The first is a very wide field Cassegrain telescope optimised for fibre feeding. It provides a Field Of View (FOV) of 2.5 degrees diameter with a 10m primary mirror. It is telecentric and works at F/3, optimal for fibre injection. As an option, a gravity invariant focus for the central 10 arc-minutes can be added, to host, for instance, a giant integral field unit (IFU). It has acceptable performance in the 360-1300 nm wavelength range. The second concept is an innovative five mirror telescope design based on a Three Mirror Anastigmatic (TMA) concept. The design provides a large FOV in a convenient, gravityinvariant focal plane, and is scalable to a range of telescope diameters. As specific example, we present a 10m telescope with a 1.5 degree diameter FOV and a relay system that allows simultaneous spectroscopy with 10,000 mini-IFUs over a square degree, or, alternatively a 17.5 square arcminutes giant IFU, by using 240 MUSE-type spectrographs. We stress the importance of developing the telescope and instrument designs for both cases.

Paper Details

Date Published: 27 July 2016
PDF: 10 pages
Proc. SPIE 9906, Ground-based and Airborne Telescopes VI, 99063C (27 July 2016); doi: 10.1117/12.2232289
Show Author Affiliations
Luca Pasquini, European Southern Observatory (Germany)
B. Delabre, European Southern Observatory (Germany)
R. Ellis, European Southern Observatory (Germany)
Tim de Zeeuw, European Southern Observatory (Germany)
Leiden Univ. (Netherlands)


Published in SPIE Proceedings Vol. 9906:
Ground-based and Airborne Telescopes VI
Helen J. Hall; Roberto Gilmozzi; Heather K. Marshall, Editor(s)

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