Design, assembly, and test of G-CLEF's exposure meter II: optical design and prototype test

Henrique Lupinari; Rafael A. S. Ribeiro; Sagi Ben-Ami; Claudia Mendes de Oliveira; Andrew Szentgyorgyi

doi:10.1117/12.3020605

18 July 2024 Design, assembly, and test of G-CLEF's exposure meter II: optical design and prototype test

Henrique Lupinari, Rafael A. S. Ribeiro, Sagi Ben-Ami, Claudia Mendes de Oliveira, Andrew Szentgyorgyi

Author Affiliations +

Proceedings Volume 13096, Ground-based and Airborne Instrumentation for Astronomy X; 130964Q (2024) https://doi.org/10.1117/12.3020605
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

This project aims to formulate, design, build and test a versatile, high-efficiency, low-resolution spectrograph to function as the G-CLEF exposure meter. G-CLEF, the first-generation Giant Magellan Telescope’s (GMT) instrument, is a state-of-the-art, high-resolution, echelle spectrograph for the GMT, expected to be completed for the telescope’s first light. The exposure meter plays a vital role for adjusting barycentric corrections of Doppler radial velocity (RV) by accounting for Earth’s chromatic atmospheric influences. Its significance becomes pronounced in Extreme Precision RV (EPRV) measurements, where the atmosphere’s wavelength dependency contributes to errors at the scale of tens of centimeters per second, the same level of precision required for detecting Earth-analog planets orbiting stars similar to the Sun, aligning with one of the primary scientific objectives of G-CLEF. This paper details the optical and mechanical designs, grounded in the principal requirements that have been previously validated through design trade-off analysis and performance simulations. Additionally, assembly and test phase of the exposure meter prototype are described together with the results that led to the validation of the design.

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

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Henrique Lupinari, Rafael A. S. Ribeiro, Sagi Ben-Ami, Claudia Mendes de Oliveira, and Andrew Szentgyorgyi "Design, assembly, and test of G-CLEF's exposure meter II: optical design and prototype test", Proc. SPIE 13096, Ground-based and Airborne Instrumentation for Astronomy X, 130964Q (18 July 2024); https://doi.org/10.1117/12.3020605

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