Paper 13094-64
Paper 13094-64
Concept design of an extremely large spectroscopic survey telescope
20 June 2024 • 13:20 - 13:40 Japan Standard Time | Room G403/404, North - 4F
Abstract
The concept design of an extremely large spectroscopic survey telescope is presented in this paper. The main optical system of this telescope is a four-mirror anastigmatic system delivering good image quality and very compact structure. It provides a 16m aperture primary or even larger, a field of view (FOV) about 5 square degree, and a f-ratio around 4. The main Nasmyth focus is for massively-multiplexed spectroscopic survey with lens-prism strips atmospheric dispersion corrector, which delivers polychromatic encircled energy EE80 in diameter within 0.6 arcsecond across the full field of view at Zenith angle up to 60⁰. Another fold mirror can be moved in before the ADC to feed the light to refine observation instruments or for wide FOV infrared observations. A coude system optimized for ground layer adaptive optics with FOV 6arcmin can be designed to give a gravity invariant focus for very high resolution spectrograph or giant IFUs. Some experimental results related to the manufacture of the lens-prism strips ADC and the supporting structure will be given in this paper too.
Presenter
Nanjing Institute of Astronomical Optics & Technology (China), Univ. of Chinese Academy of Sciences (China)
Researcher from NIAOT. The main research fields include astronomical optical technology, telescope optical system design,ground-layer adaptive optics and astronomical site testing technology. Once worked on the optical design and project management of Antarctic telescopes, the multi-channel photometric survey telescope,and China large-aperture Optical/NIR telescope.