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

I. Di Varano; M. Woche; K. G. Strassmeier; I. Ilyin; M. Weber; S. Yuan; S. Covino; P. Di Marcantonio; M. Landoni; M. Genoni; M. Riva; A. Marconi

doi:10.1117/12.2312115

10 July 2018 ELT-HIRES the high resolution spectrograph for the ELT: phase-A design of its polarimetric unit

I. Di Varano, M. Woche, K. G. Strassmeier, I. Ilyin, M. Weber, S. Yuan, S. Covino, P. Di Marcantonio, M. Landoni, M. Genoni, M. Riva, A. Marconi

Author Affiliations +

Proceedings Volume 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III; 107061Y (2018) https://doi.org/10.1117/12.2312115
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

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.

Conference Presentation

Citation Download Citation

I. Di Varano, M. Woche, K. G. Strassmeier, I. Ilyin, M. Weber, S. Yuan, S. Covino, P. Di Marcantonio, M. Landoni, M. Genoni, M. Riva, and A. Marconi "ELT-HIRES the high resolution spectrograph for the ELT: phase-A design of its polarimetric unit", Proc. SPIE 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III, 107061Y (10 July 2018); https://doi.org/10.1117/12.2312115

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