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Proceedings Paper

ELT-HIRES the high resolution spectrograph for the ELT: phase-A design of its polarimetric unit
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Paper Abstract

The Phase A study for the high-resolution spectrograph for the Extremely Large Telescope (ELT-HIRES) has been concluded in late 2017. We present the main outcome for a polarimetric light feed from the intermediate focus (IF) and a Nasmyth focus of the telescope. We conclude that the use of the IF is mandatory for high-precision spectropolarimetry. Among the description of the product tree, we present phase-A level opto-mechanical designs of the subunits, describe the observational and calibration modes, the PSF error budget, and the preliminary FEM structural and earthquake analysis.

An update on the development of a ray tracing polarimetric simulator to estimate the instrumental polarization including both the telescope mirrors and the optical elements of the polarimeter is reported. Trade-off strategies and ongoing solutions in view of the Phase B are outlined too.

Paper Details

Date Published: 10 July 2018
PDF: 20 pages
Proc. SPIE 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III, 107061Y (10 July 2018); doi: 10.1117/12.2312115
Show Author Affiliations
I. Di Varano, Leibniz-Institut für Astrophysik Potsdam (Germany)
M. Woche, Leibniz-Institut für Astrophysik Potsdam (Germany)
K. G. Strassmeier, Leibniz-Institut für Astrophysik Potsdam (Germany)
I. Ilyin, Leibniz-Institut für Astrophysik Potsdam (Germany)
M. Weber, Leibniz-Institut für Astrophysik Potsdam (Germany)
S. Yuan, Yunnan Observatories (China)
S. Covino, INAF - Osservatorio Astronomico di Brera (Italy)
P. Di Marcantonio, INAF - Osservatorio Astronomico di Trieste (Italy)
M. Landoni, INAF - Osservatorio Astronomico di Brera (Italy)
M. Genoni, INAF - Osservatorio Astronomico di Brera (Italy)
M. Riva, INAF - Osservatorio Astronomico di Brera (Italy)
A. Marconi, Univ. degli Studi di Firenze (Italy)


Published in SPIE Proceedings Vol. 10706:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III
Ramón Navarro; Roland Geyl, Editor(s)

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