HARMONI at ELT: calibration module functional and design description

Heribert Argelaguet Vilaseca; Javier Piqueras López; Alberto Estrada Piqueras; Alonso Alvarez Ureña; Irene Ferro; Gonzalo Carracedo Carballal; Santiago Arribas; Miguel Pereira-Santaella; Marianela Fernandez Rodriguez; Noah Schwartz

doi:10.1117/12.3020324

18 July 2024 HARMONI at ELT: calibration module functional and design description

Heribert Argelaguet Vilaseca, Javier Piqueras López, Alberto Estrada Piqueras, Alonso Alvarez Ureña, Irene Ferro, Gonzalo Carracedo Carballal, Santiago Arribas, Miguel Pereira-Santaella, Marianela Fernandez Rodriguez, Noah Schwartz

Author Affiliations +

Proceedings Volume 13096, Ground-based and Airborne Instrumentation for Astronomy X; 130964V (2024) https://doi.org/10.1117/12.3020324
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

HARMONI is the first light visible and near-IR integral field spectrograph for the ELT. It covers a large spectral range from 450nm to 2450nm with resolving powers from 3500 to 18000 and spatial sampling from 60mas to 4mas. It can operate in two Adaptive Optics modes - SCAO (including a High Contrast capability) and LTAO - or with NOAO. The project is preparing for Final Design Reviews. The Calibration Module (CM) is part of the HARMONI Instrument. It includes all the functionalities necessary to remove the instrumental signature from the observed science data, perform the technical calibrations needed to set up other sub-systems, and for monitoring the health of the instrument during operations. The CM is a complex and accurate optical configurable mechanism mainly composed by the following calibration units:

Integral Field Spectrograph Calibration Unit (ICU): It provides calibration for the integral field spectrograph. The ICU mimics the ELT pupil and F/# at the HARMONI entrance and provides with a set of illumination patterns by combining different light sources and focal plane masks.

Adaptive Optics Calibration Unit (AOCU): Intended for “Natural Guide Star Sensors (NGSS)” and “Laser Tomography Adaptive Optics (LTAO)” calibration.

Geometrical Calibration Unit (GCU): Using a well-known geometrical pattern of barely resolved point sources made of 480 optical fibers, this unit is intended for the NGSS guide probes.

In this paper, we present an overview of the CM design, describing its functional and optomechanical implementation.

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

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Heribert Argelaguet Vilaseca, Javier Piqueras López, Alberto Estrada Piqueras, Alonso Alvarez Ureña, Irene Ferro, Gonzalo Carracedo Carballal, Santiago Arribas, Miguel Pereira-Santaella, Marianela Fernandez Rodriguez, and Noah Schwartz "HARMONI at ELT: calibration module functional and design description", Proc. SPIE 13096, Ground-based and Airborne Instrumentation for Astronomy X, 130964V (18 July 2024); https://doi.org/10.1117/12.3020324

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