MORFEO is an adaptive optics module able to compensate the wavefront disturbances affective the scientific observation. It will be installed on the straight-through port of the telescope Nasmyth platform to serve the first-light instrument MICADO and with the provision for a future second instrument. The module successfully passed the Preliminary Design Review in 2021 and is currently in the Final Design phase. In this paper we present the status of the Thermal Control System (ThCS) with a focus on the thermal and cooling circuits design. The prototyping plan foreseen for the future to validate this circuit are also foreseen.
The Multiconjugate adaptive Optics Relay for ELT Observations (MORFEO), and adaptive optics module being developed for the ESO Extremely Large Telescope, has officially entered the Final Design phase. The control electronics functions, power and network distribution, system management and monitoring are all part of the MORFEO Instrument Control Hardware. It is based on industrial COTS components, and most of its functions are managed through the use of a PLC-based architecture. The EtherCAT protocol also allows great flexibility in the choice of the PLC modules topology. This proves especially useful for MORFEO, as its control electronics cabinets are distributed in different locations, due to the limited space available on the Nasmyth Platform. The industrial elements also present many additional advantages: among them, a quick update of the components during the life of the telescope, useful support from the providers in their implementation, easy procurement of spare parts, and a more accurate reliability analysis of the whole system. This paper describes the current, up-to-date design of the Instrument Control Hardware and the general ruels developed for the design of each MORFEO subsystems control electronics, in order to optimize the architecture while in compliance with ESO requirements. Finally, an overview of the expected steps that will be taken to bring all aspects of the overall design to a Final Design maturity level is given.
MORFEO (Multi-conjugate adaptive Optics Relay For ELT Observations, known as MAORY), is the Multi-conjugate Adaptive Optics (MCAO) relay for the Extremely Large Telescope (ELT) that will provide diffraction-limited optical quality to two instruments at the ELT Nasmyth Platform. One first light instrument fed by MORFEO is the Multi-AO Imaging Camera for Deep Observations (MICADO) that will provide imaging, astrometric, spectroscopic and coronographic observing modes; a second-generation instrument, still to be defined, will occupy the second instrument port powered by MORFEO. The two instruments will be assisted alternately by MORFEO thanks to a flat steering mirror that can redirect the beam towards one or the other instrument. The particular shape of the MORFEO module is closely related to the position of the optical elements and the relative optical path that is mainly developed in a vertical plane. For this reason, the Main Support Structure is “almost empty” in the central plane, in order to accommodate both the opto-mechanical elements and sub-systems and allow the light to pass into. MORFEO has officially passed the Preliminary Design Review in February 2023. The general overview of the mechanical design for the MAIN STRUCTURE described in this paper is an updated version of the configuration presented for the Preliminary Design Review in the first half of 2021.
MORFEO (Multi-conjugate adaptive Optics Relay For ELT Observations), formerly known as MAORY, will play a crucial role in deploy a corrected Field of View to ELT instruments. To allow the wavefront sensing, a Laser Guide Stars (LGS) channel is foreseen composed by two subsystems: an objective to materialize a monochromatic (sodium layer wavelength) focal plane (the LGS Objective, LGSO) and the proper LGS wavefront sensor system (LGSWFS). Here we report about the LGSO optical design, reviewing the requirements, summarizing the geometrical and optical properties of LGSO elements and discussing the expected performances, both for the nominal system and tacking into account tolerances.
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