Seoul National University Radio Astronomy Observatory (SRAO), a 6-meter single-dish telescope recently applied new 100GHz and 230GHz dual-band receiver. The SRAO had been inactive for several years, but resumed operation by adapting the Combined Array for Research in Millimeter-wave Astronomy (CARMA) receiver. We succeeded in the single-dish observations in 2019 March. We upgraded the SRAO to the mm-VLBI station and participated in the test observation of East Asia VLBI Network (EAVN) with several telescopes worldwide. The simultaneous single dish and VLBI observation is possible. We are going to design the new receiver and import a wideband 230GHz mixer and have a VLBI observation with Korean VLBI Network (KVN). Also, we are planning to test the phase reference technique between 100Ghz and 230GHz.
Devasthal Optical Telescope Integral Field Spectrograph (DOTIFS) is a new multi-Integral Field Unit (IFU) instrument, planned to be mounted on the 3.6m Devasthal optical telescope in Nainital, India. It has eight identical, fiber-fed spectrographs to disperse light coming from 16 IFUs. The spectrographs produce 2,304 spectra over a 370-740nm wavelength range simultaneously with a spectral resolution of R=1200-2400. It is composed of all-refractive, allspherical optics designed to achieve on average 26.0% throughput from the telescope to the CCD with the help of high transmission spectrograph optics, volume phase holographic grating, and graded coated e2v 2K by 4K CCD. We present the optical and opto-mechanical design of the spectrograph as well as current development status. Optics and optomechanical components for the spectrographs are being fabricated.
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