The Muztage-Ata One-point-nine-three-meter Synergy Telescope (MOST) is a novel equatorial telescope currently 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 channels. 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 SCUTUM 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 elements, 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.
IMSP is the versatile first-light instrument under construction for the 4m telescope in China. The special feature of IMSP is the multimode operation modes and high-efficiency. Direct imaging mode is designed to work in a synchronous multi-color bands covering from 360 to 1700 nm using two dichroic mirrors with a 3’x3’ field of view (FOV). Long-slit spectrograph mode supports two spectral resolutions operation modes (R=1000 and 5000) via different combination of Volume Phase Holographic Prisms to cover the whole spectrum in visible. High resolution spectrograph mode (R=30000-60000) with wavelength range from 380 to 800 nm is reserved using fiber link system connected from Nasmyth foci to the enviroment controled room. The IMSP is planned to strart commssion at the end of 2021. In this paper, the lastest status of IMSP development will be given, including the final optical design and the integration of each sub-system.
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