Design of a FUV polarimeter for Pollux aboard HWO

Adrien Girardot; Coralie Neiner; Jean-Michel Reess

doi:10.1117/12.3017994

21 August 2024 Design of a FUV polarimeter for Pollux aboard HWO

Adrien Girardot, Coralie Neiner, Jean-Michel Reess

Proceedings Volume 13093, Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray; 130933V (2024) https://doi.org/10.1117/12.3017994
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

There are currently no high-resolution wide-wavelength range spectropolarimeters in the UV domain. This represents a critical gap in our observational capabilities. Overcoming this challenge holds promise for opening up new frontiers in the study of celestial objects, from star-planet interactions to cosmology. The design of the POLLUX spectropolarimeter for the HWO mission comprises four channels in the visible, near-UV, mid-UV, and far-UV ranges. Although MgF₂ will be used for the polarimeters in the NUV and MUV, the challenge arises in the far-UV range (100-120 nm), where the absence of known transparent birefringent glasses poses a substantial hurdle. The solution lies in the development of a new type of spectropolarimeter, the reflective FUV polarimeter. After a first study conducted several years ago, the goal of this work is to improve the TRL of this new kind of spectropolarimeter. This article describes the proposed design of the FUV polarimeter for HWO, the optimisation process using the Mueller calculus, and the ongoing prototyping and tests conducted.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Adrien Girardot, Coralie Neiner, and Jean-Michel Reess "Design of a FUV polarimeter for Pollux aboard HWO", Proc. SPIE 13093, Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray, 130933V (21 August 2024); https://doi.org/10.1117/12.3017994

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