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The Natural Guide Star Sensors (NGSS) system of HARMONI provides wavefront and image stabilisation sensing for each of the observing modes of the instrument. The Focal Plane Relay System (FPRS) relays and redirects the telescope beam from the ELT Prefocal Station (PFS) to the NGSS and spectrograph. To limit thermal background and to ensure the required stability, the sensors and optics are contained in a dry gas environment stabilized at -15 degrees Celsius. Achieving this cooled, dry environment requires an insulated enclosure, cooling system and dry air flushing system. These measures present certain novel challenges; the design solutions are described here.
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Tom Louth, David Montgomery, Stuart Watt, William Cochrane, Fraser Clarke, Kjetil Dohlen, William Humphreys, "HARMONI at ELT: cooled environment for focal plane relay optics and guide star sensors; design ahead of FDR," Proc. SPIE 12184, Ground-based and Airborne Instrumentation for Astronomy IX, 121842N (29 August 2022); https://doi.org/10.1117/12.2627706