中国科学院南京天文光学技术研究所机构知识库

The Muztage-Ata One-point-nine-three-meter Synergy Telescope(MOST)is a novel equatorial telescope cur rently being constructed in China.Spectroscopy of bi-Channel with UlTra-wide band and high flUx for MOST (SCUTUM)serves as one of the first-light instruments and adopts a modified FOSC type design with two chan nels.The design incorporates a shared catadioptric collimator followed by separate refraction cameras in each channel,where in between filters and grisms are inserted into the optical path through two rotating wheel units. The instrument converts the F/8 beam from the telescope to a nearly F/4.3 beam.The spectroscopy of SCU TUM can be performed in the wavelength range 310-1000nm in one exposure,offering various choices of grisms and slits with resolution ranging from 250 to 7500.The theoretical monochromatic RMS spot sizes are expected to be between 0.04′ ′and 0.26 ′′.To optimize total throughput,SCUTUM employs high-efficiency optical ele ments,coatings,and sensitivity-enhanced detectors within its operational band.The overall transmission from the collimator to the detector is anticipated to exceed 20%at 330nm and surpass 40%at wavelengths above 355nm when operating in R≤3000 mode.The designed weight of this instrument amounts to approximately 280kg.The instrument is currently planned to be assembled in the Institute laboratory in September and to be commissioned on MOST in 2025.