HARMONI at ELT: opto-mechanics of the IFS pre-optics at CDR

Elvio Hernández; Alberto Hernández; Ángel Alonso; Begoña García-Lorenzo; Hermine Schnetler; Niranjan Thatte

doi:10.1117/12.2626988

29 August 2022 HARMONI at ELT: opto-mechanics of the IFS pre-optics at CDR

Elvio Hernández, Alberto Hernández, Ángel Alonso, Begoña García-Lorenzo, Hermine Schnetler, Niranjan Thatte

Proceedings Volume 12184, Ground-based and Airborne Instrumentation for Astronomy IX; 121842J (2022) https://doi.org/10.1117/12.2626988
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). It covers a large spectral range from 450nm to 2450nm with resolving powers from 3500 to 18000 and spatial sampling from 60mas to 4mas. The IFS Pre-Optics (IPO), sub-system under the responsibility of the Institute of Astrophysics of the Canary Islands (IAC), contains 30 opto-mechanical mounts working at cryogenic temperatures and are classified into three types depending on the mirror shape: [1] - Sprung kinematic mount for flat mirrors: By spring loading, the mirror is constrained radially against a Vee-groove. - Thermally compensated kinematic sprung mount for power mirrors: It is similar to the previous mount but the radial pads compensate mirror radial movement. - Bonded mount for toroidal mirrors: The mirror is bonded to a rear invar pad, which serves as an interface to the support. This work describes the designs developed for the opto-mechanical modules of the Instrument IPO in order to comply with the sub-system requirements. We also present the prototypes developed to prove some of the adopted concepts in the design.

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Elvio Hernández, Alberto Hernández, Ángel Alonso, Begoña García-Lorenzo, Hermine Schnetler, and Niranjan Thatte "HARMONI at ELT: opto-mechanics of the IFS pre-optics at CDR", Proc. SPIE 12184, Ground-based and Airborne Instrumentation for Astronomy IX, 121842J (29 August 2022); https://doi.org/10.1117/12.2626988

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