Design And Analyze Of The Telescope Of Southern Spectroscopic Survey Telescope Project

As the progress of astronomy,the human being has much more understanding about the universe.And in order to explore more things hidden in the deep space,people need better astronomical instruments to assist their observation.Therefore,the research of telescopes and other astronomical instruments has become a hot spot in recent years.The design of Sky Survey Telescope is one of them.In the past 20 years,nearly 100 Sky Survey Telescope projects have been approved or put into use.As an important part of the Sky Survey Telescope,the large-scale spectral Survey Telescope has become an indispensable large-scale scientific instrument for some astronomical research directions.It plays an irreplaceable role in the study of cosmic evolution and galaxy formation.Although the related research in China in the last century is relatively backward,the design and research work of the domestic Spectroscopic Survey Telescope is in a booming period.The construction of LAMOST and many new conceptual designs are the epitome of this period.At present,the most advanced spectral Survey Telescope in the world is the dark energy spectroscopic instrument(DESI)based on the 4-meter Mayell telescope.It has a field of view of 3.2 ° and 5000 optical fibers.Its EE80 is about 0.38 arcsec in its working range.Here we present an optical design about Spectroscopy Survey Telescope.It has two mirrors and five pieces of correctors,with an aperture of 6.5 meters and a field of view of 2.6 °.In order to better access the optical fiber spectrometer,the focal ratio of the system is set to3.35.For dealing with the influence of atmospheric dispersion effectively at such a high resolution,a group of atmospheric dispersion correctors with maximum dispersion correction zenith angle of 50 degrees is included in this design.Its EE80 is about 0.25 arcsec in its working range.The number of its fibers is set at 4000.Compared with DESI,it has better imaging quality and larger aperture.Although this design may not have all-round advantages compared with desi,it still has very strong competitiveness.And the design of it will be a solid foundation for our future design work.