The Main Selection Mechanism (MSM) is the cryogenic subsystem of the Multi-AO Imaging Camera for Deep Observations (MICADO) which allows to switch between the operational modes (imaging, spectroscopy, calibration) of the instrument. MICADO is one of the first light instruments for the ESO Extremely Large Telescope (ELT) and operates in the near-infrared wavelength range. The MSM is located inside the MICADO cryostat and it operates under vacuum conditions and cryogenic temperatures (`~82K). The mechanism consists of a main support structure and a rotating platform, where the MICADO Low Resolution Imager, Spectrometer and Pupil Imager modules are located. In this paper we give an overview of the final design of the MSM, which was presented at the MICADO final design review (FDR) in October 2021.
KEYWORDS: Photonic integrated circuits, Control systems, Cryogenics, Control systems design, Telecommunications, Spectroscopes, Sensors, Safety, Near infrared spectroscopy, Imaging spectroscopy
The Multi-Adaptive Optics Imaging Camera for Deep Observations is one of the first light ESO Extremely-Large-Telescope (ELT) Instruments and now in it's final design stage. At a previous SPIE we sketched the PLC-based instrument control system, now we highlight more specific issues like efforts on thermal management system optimization, improvements on harness properties and advantageous controller conceptions - all seen in the context of ESOs requirements. We focus now on details for the 9 motorized cryogenic axis as well as the cryogenic and vacuum control and supervision for the delicate cryostat opto-mechanical and detector components embedded into ESO`s instrument control system environment.
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