HARMONI at ELT: mechanisms of the pre-optics at CDR

Elvio Hernández; Alejandro Luján; Yolanda Martín; Ángel Alonso; Begoña García-Lorenzo; Niranjan Thatte; Hermine Schnetler

doi:10.1117/12.2627518

29 August 2022 HARMONI at ELT: mechanisms of the pre-optics at CDR

Elvio Hernández, Alejandro Luján, Yolanda Martín, Ángel Alonso, Begoña García-Lorenzo, Niranjan Thatte, Hermine Schnetler

Author Affiliations +

Proceedings Volume 12184, Ground-based and Airborne Instrumentation for Astronomy IX; 121842L (2022) https://doi.org/10.1117/12.2627518
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

HARMONI is the first light visible and near-IR integral field spectrograph for the Extremely Large Telescope (ELT). This instrument covers a large spectral range from 450nm to 2450nm with resolving powers from 3500 to 18000 and spatial sampling from 60mas to 4mas. The Pre-Optics (sub-system under the responsibility of the IAC) contains five mechanisms working at cryogenic temperatures. Three types of mechanisms are needed to provide full functionality: wheels (2), turrets (2) and shutter (1). The wheels and turrets, supported by a series of radial and axial bearings, are driven by stepper motors through a system of gears that provide mechanical reduction. In addition, the focal plane mask wheel has a detent system to improve repeatability to within +/- 2.5 microns. Finally, the shutter consists in two masks with three clover shape blades mounted on a stepper motors. The work describes the main IPO mechanisms requirements and the design developed for every module. We also present some of the prototypes developed to proof the concepts adopted in the design..

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Elvio Hernández, Alejandro Luján, Yolanda Martín, Ángel Alonso, Begoña García-Lorenzo, Niranjan Thatte, and Hermine Schnetler "HARMONI at ELT: mechanisms of the pre-optics at CDR", Proc. SPIE 12184, Ground-based and Airborne Instrumentation for Astronomy IX, 121842L (29 August 2022); https://doi.org/10.1117/12.2627518

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