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29 August 2022 HARMONI at ELT: Design and testing of the focal plane relay window flusher
William A. Cochrane, David M. Montgomery, Patrick Smith, Norman O'Malley, William Humphreys, Fraser Clarke
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Proceedings Volume 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V; 1218812 (2022) https://doi.org/10.1117/12.2630390
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada
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 40mas. 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 Focal Plane Relay Sub-System (FPRS) relays the ELT's Nasymth A2 focal plane to the HARMONI IFS focal plane. The FPRS maintains a -15°C environment to reduce additional thermal noise and contains two Ø600 mm x 20 mm windows in a double-glazing arrangement at the entrance. The external window surface temperature will be below the ambient telescope temperature due to insulation limitations and could lead to condensation forming reducing optical throughput and increased scatter, in particular in the IR-bands. We present the design and testing of a window flushing solution utilizing air knife technology
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William A. Cochrane, David M. Montgomery, Patrick Smith, Norman O'Malley, William Humphreys, and Fraser Clarke "HARMONI at ELT: Design and testing of the focal plane relay window flusher", Proc. SPIE 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V, 1218812 (29 August 2022); https://doi.org/10.1117/12.2630390
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KEYWORDS
Relays
Visible radiation
Adaptive optics
Iterated function systems
Spectral resolution
Spectrographs
Telescopes
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