CUBES, the Cassegrain U-band efficient spectrograph: the calibration unit for the UV

Le résumé fourni par la source

The Cassegrain U-Band Efficient Spectrograph (CUBES) for the ESO VLT is optimized for high-efficiency spectroscopy in the near-UV (300–405 nm) at R > 20,000 (and R ~ 7,000 in a lower-resolution mode). Achieving accurate calibration in this spectral region poses specific challenges, including the scarcity of suitable continuum and line sources and stringent stability requirements for flat-fielding and wavelength calibration. We present the final design of the CUBES Calibration Unit, which passed its Final Design Review in July 2025 and is now in the MAIT phase. The system provides flat-field, wavelength calibration, and illumination characterization through a dedicated optical path feeding the instrument at the Cassegrain focus. We describe the calibration strategy, the optical and mechanical architecture, the control electronics, and performance predictions. Installation at the VLT is planned for 2030.

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