ESO’s ELT halfway through construction

Roberto Tamai; Bertrand Koehler; Michele Cirasuolo; Fabio Biancat-Marchet; Mauro Tuti; Juan-Carlos González-Herrera; Suzanne Ramsay

doi:10.1117/12.3017380

11 September 2024 ESO’s ELT halfway through construction

Roberto Tamai, Bertrand Koehler, Michele Cirasuolo, Fabio Biancat-Marchet, Mauro Tuti, Juan-Carlos González-Herrera, Suzanne Ramsay

Author Affiliations +

Proceedings Volume 13094, Ground-based and Airborne Telescopes X; 1309415 (2024) https://doi.org/10.1117/12.3017380
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

The construction of the ESO’s Extremely Large Telescope (ELT) passed it 50% completion milestone in 2023. There has been good progress on all fronts over the past two years. The construction site at Armazones (Chile) went from a flat landscape dominated by rocks and lean concrete to a mountain top housing finished structural concrete foundations and an 80m-high dome steel structure. In Europe, the manufacturing of the telescope structure is half complete; tens of M1 segments have been polished to excellent optical quality; the M2 mirror is quickly approaching its final figuring accuracy; the M4 adaptive mirror has received all its six Zerodur® thin shells and is progressing to full laboratory integration; the M5 has reached a critical step with the brazing of the six CVD-coated SiC petals; the two large Pre-focal Stations are close to start their final testing; the four instruments are all in final design phase with some having started procurement and more. This paper summarizes the current status of the ESO’s ELT Construction.

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Citation Download Citation

Roberto Tamai, Bertrand Koehler, Michele Cirasuolo, Fabio Biancat-Marchet, Mauro Tuti, Juan-Carlos González-Herrera, and Suzanne Ramsay "ESO’s ELT halfway through construction", Proc. SPIE 13094, Ground-based and Airborne Telescopes X, 1309415 (11 September 2024); https://doi.org/10.1117/12.3017380

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