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Communication Dans Un Congrès Année : 2019

POLLUX, an innovative instrument providing a unique UV spectropolarimetric capability to LUVOIR

Résumé

The Large Ultraviolet/Optical/Infrared Surveyor (LUVOIR) is one of four large mission concept studies led by NASA for the 2020 Decadal Survey. Under the leadership of French Institutes and French Space Agency, European institutes have come together to propose an instrument, POLLUX, that would be onboard the 15-meter primary mirror option of LUVOIR. POLLUX will operate over a broad spectral range (90 to 400 nm), at high spectral resolution (R >=120,000), with a unique spectropolarimetric capability. It is designed to address a range of questions at the core of the LUVOIR Science portfolio. The working range is split into 3 channels: Far (90-125 nm), Medium (119-200 nm), and Near (200-400 nm) ultraviolet. MUV and NUV channel, separated by a dichroic splitter, can be recorded simultaneously. The FUV channel is recorded separately (temporal separation), using a dedicated flip-mirror. The coatings on the optical elements of POLLUX are optimized for each channel, to maximize the throughput. Each channel will include an optimized echelle spectrograph integrating advanced technologies, i.e. high groove densities, holographic recording on a freeform surface for the cross-dispersors, etc. The polarimeters design were optimized for each channel accounting for the technological feasibility. They are retractable in the MUV and NUV to allow the pure spectroscopic mode. The FUV modulator is retractable while the analyzer is kept in the optical path to direct the beam towards the collimator. Detectors will be delta-doped EMCCDs, combining the linearity of CCDs with photon-counting ability, which is a key capability enabling detection of faint UV signals. Furthermore, these detectors deliver high quantum efficiency thus offering the possibility to reach very high signal-to-noise ratios. CMOS are also considered as a viable option in the development time-frame of POLLUX. The complete study will be included as a dedicated POLLUX chapter in the document presenting the final study of LUVOIR to the NASA decadal 2020 committee. In this poster, we present the instrument concept, as well as the challenges offered by the development of POLLUX.
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Dates et versions

hal-02323395 , version 1 (21-10-2019)

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Marc Ferrari, Jean-Claude Bouret, Coralie Neiner, Eduard Muslimov, Maëlle Le Gal, et al.. POLLUX, an innovative instrument providing a unique UV spectropolarimetric capability to LUVOIR. American Astronomical Society, AAS Meeting #233, Jan 2019, Seattle, United States. ⟨hal-02323395⟩
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