HARMONI ELT instrument : Integral Field Unit cryogenic engineering models results
Résumé
HARMONI is the first light visible and near-IR integral field spectrograph for the ELT. It covers a large spectral range from 450nm to 2450nm with resolving powers from 3500 to 18000 and spatial sampling from 60mas to 4mas. It can operate in two Adaptive Optics modes -SCAO and LTAO -or with NOAO. The Integral Field Unit (IFU) sub-system is part of an Integral Field Spectrograph cooled down at 130K. The IFU is in charge of splitting, slicing and rearranging the rectangular field of view into 4 long slits (~540mm) to feed 4 spectrographs. It consists of more than 60 mirrors blocks that have to be aligned and maintained inside the HARMONI cryostat. As the project prepares for Final Design Reviews, we present the design of the IFU mirror mounts as well as performance results obtained on engineering models.
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