HARMONI at ELT: pick-off arm module design status and prototype results

Alberto Estrada; Javier Piqueras; Heribert Argelaguet; Tim Morris; Marc Dubbeldam; Lisa Bardou; Andrew Dunn; Rishi Deshmukh; Kjetil Dohlen; David Le Mignant; Fraser Clark; Santiago Arribas; Miguel Pereira-Santaella

doi:10.1117/12.2627498

29 August 2022 HARMONI at ELT: pick-off arm module design status and prototype results

Alberto Estrada, Javier Piqueras, Heribert Argelaguet, Tim Morris, Marc Dubbeldam, Lisa Bardou, Andrew Dunn, Rishi Deshmukh, Kjetil Dohlen, David Le Mignant, Fraser Clark, Santiago Arribas, Miguel Pereira-Santaella

Author Affiliations +

Proceedings Volume 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V; 121883O (2022) https://doi.org/10.1117/12.2627498
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 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 three Adaptive Optics modes – SCAO, HCAO and LTAO - or with NOAO. The project is preparing for Final Design Reviews. The Pick-Off Arm (POA) module is part of the Low Order Wavefront Subsystem (LOWFS) which provides field stabilisation and low-order wavefront sensing in seeing-limited and LTAO observing modes, measuring the motion of the instrument focal plane relative to the telescope wavefront sensors. The POA module provides the source acquisition and tracking capabilities with 6 μm accuracy over a technical field of 400 mm (120 arcseconds) in diameter. The acquired beam is then reflected into the AO bench (LOB). A two-axis theta-phi architecture is proposed, with a large 600mm diameter “theta” axis carrying at its perimeter a small “phi” axis; the combined rotation of both therefore allowing a 300mm long periscope carried on the phi axis to position a Pick-Off Mirror anywhere within the full technical field. A flow-down of the main requirements is presented, describing the interaction between the different error contributors and the overall accuracy budget. Furthermore, we present the POA baseline design, together with the analysis of the technologies used within the POA different units. Finally, the prototype activities developed are also described with preliminary results of tests demonstrating the required positioning accuracy.

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Alberto Estrada, Javier Piqueras, Heribert Argelaguet, Tim Morris, Marc Dubbeldam, Lisa Bardou, Andrew Dunn, Rishi Deshmukh, Kjetil Dohlen, David Le Mignant, Fraser Clark, Santiago Arribas, and Miguel Pereira-Santaella "HARMONI at ELT: pick-off arm module design status and prototype results", Proc. SPIE 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V, 121883O (29 August 2022); https://doi.org/10.1117/12.2627498

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