The MICADO first light imager for the ELT: the mechanical manufacturing design of the cryostat

Résumé fourni par la source

MICADO, the Multi-AO Imaging Camera for Deep Observation, will be one of the first light instruments for the 39m Extremely Large Telescope (ELT) of the European Southern Observatory (ESO) in Chile on the Cerro Armazones mountain. MICADO utilizes the advanced laser guide star multi-conjugate adaptive optics system MCAO developed by the MORFEO consortium and in the standalone mode the developed single-conjugate adaptive optics (SCAO). The MICADO instrument will operate with different modes (standard imaging, astrometry, coronagraphy and spectroscopy) in the near-infrared (NIR) wavelength range. Each of the nine state-of-the-art near infrared detectors will have 4096 x 4096 pixels, each pixel 15μm × 15μm in size. The continuous LN2 flow cryostat, which will operate at 82K, is the centerpiece of the instrument, housing all major cold subsystems such as the cold optics, mechanisms with filters and masks, and the detectors. The Max Planck Institute for Extraterrestrial Physics and the company CRYOVAC low temperature technologies are responsible for the design and the manufacturing of the MICADO Cryostat. In this paper, we describe the mechanical design, the design of the interface with the cold sub-systems in the vacuum chamber as well as the details of the radiation shield hosted in the stainless-steel vessel. Finally, we report on the current status of the manufacturing process.

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