Zhurnal Radioelektroniki - Journal of Radio Electronics. eISSN 1684-1719. 2022. №7
ContentsFull text in Russian (pdf)
DOI: https://doi.org/10.30898/1684-1719.2022.7.9
EURASIAN SUBMILLIMETER TELESCOPES (ESMT) PROJECT.
POSSIBILITY OF SUBMM IMAGE QUALITY IMPROVEMENT USING ADAPTIVE OPTICS
V.B. Khaikin 1, A.Yu. Shikhovtsev 2, V.E. Shmagin 3, M.K. Lebedev 1,
E.A. Kopylov 3,4, V.P. Lukin 4, P.G. Kovadlo 2
1 Special Astrophysical Observatory of Russian Academy of Sciences
369167, Russia, Nizhnij Arkhyz
2 Institute of Solar-Terrestrial Physics, Siberian Branch of Russian Academy of Sciences
664033, Russia, Irkutsk, Lermontova st. 126a
3 Institute of Astronomy of Russian Academy of Sciences
119017, Russia, Moscow, Pyatnitskaya st. 48
4 Zuev Institute of Atmospheric Optics, Siberian Branch of Russian Academy of Sciences
634055, Russia, Tomsk, Akademicheskii pr. 1
The paper was received May 21, 2022.
Abstract. Actual problems in submillimeter astronomy require the creation of instruments, which combine high sensitivity, angular resolution, wide field of view, and multi-wavelength (multicolor) spectral range. Currently, new single mm/submm telescopes are in great demand in Eurasia, as well as their inclusion in the Event Horizon Telescope (EHT) VLBI network. The concept of the Eurasian Submillimeter Teselscopes (ESMT) project involves the construction of three structurally identical mm/submm radio telescopes of the 15-21 m class on the Suffa Plateau, Uzbekistan (2400 m or higher), in the Russian Federation (3000 m or higher) and in Tibet, China (higher than 5000 m). The ESMT concept is considered, where the design of the European ALMA antennas is taken as a starting point. The antenna diameter should be increased from 12 m to 21 m, the optical layout and the structure of the truss frame will be changed accordingly, tertiary optics and an “active surface” have been added, and tools for its operational diagnostics have been proposed. The article presents variants of the ESMT optical scheme and tertiary optics, which make it possible to hold a compact cryostat with a KID-matrix in a vertical position to ensure its operability when the telescope is tilted. Comparison of ESMT capabilities with other mm/submm tools and projects is provided. The necessary astroclimatic conditions and characteristics of ESMT sites are considered, estimates of the precipitated water PWV, dPWV and the share of total cloudiness TCC for a number of practically interesting sites obtained using the ERA-Interim and ERA-5 reanalysis databases are presented. The influence of atmospheric turbulence on a radio telescope, radio astronomy methods for suppressing atmospheric fluctuations and possibilities of using adaptive optics, in particular, tip-tilt correction for improving the quality of submm images, are considered.
Key words: submillimeter astronomy, submillimeter telescope, astroclimate, adaptive optics.
Financing: The research was carried out with the financial support of the Ministry of Education and Science of the Russian Federation within the framework of the basic project of the Institute of Solar-Terrestrial Physics SB RAS "Methods and instruments of Astrophysical experiment" (unique number 0278-2021-0010), as well as the program of fundamental research SB RAS Institute of Atmospheric Optics SB RAS "Study of the formation of optical images and radiation beams in the atmosphere using adaptive optics, including the propagation of powerful, amplitude- and phase-modulated optical radiation" (FWRU-2021-0003).
Corresponding author: Khaikin Vladimir Borisovich, vkhstu@mail.ru
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For citation:
Khaikin V.B., Shikhovtsev A.Yu., Shmagin V.E., Lebedev M.K., Kopylov E.A., Lukin V.P., Kovadlo P.G. Eurasian Submillimeter Telescopes (ESMT) project. Possibility of submm image quality improvement using adaptive optics. Zhurnal radioelektroniki [Journal of Radio Electronics] [online]. 2022. №7. https://doi.org/10.30898/1684-1719.2022.7.9 (In Russian)